The Neurogenic Niche: Interactions Among Vessels, Glia, and Neural Stem Cells

The Neurogenic Niche: Interactions Among Vessels, Glia, and Neural Stem Cells | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed. Data may be preliminary. 18 October 2025 V1 Latest version Share on The Neurogenic Niche: Interactions Among Vessels, Glia, and Neural Stem Cells Author : Khodakaram Jahanbin 0000-0001-8460-3850 [email protected] Authors Info & Affiliations https://doi.org/10.22541/au.176081250.01618371/v1 Published Stem Cells International Version of record Peer review timeline 552 views 191 downloads Contents Abstract The Neurogenic Niche: Interactions Among Vessels, Glia, and Neural Stem Cells 2.1. The Vascular-Neural Crosstalk 2.2. The Astrocyte Pillar: An Essential Component 2.3. The Immune-Neural Crosstalk (Microglia) 2.4. Top-Down Control by Neural Circuits 3. Systemic Regulation of the Niche 3.1. Physiological Cues (Exercise) 3.2. The Gut-Brain-Niche Axis 3.3. Additional Environmental and Lifestyle Factors 4. Human Translation and Comparative Biology 5. The Breakdown of the Alliance: Pathological Hubs 6. Future Directions and Therapeutic Paradigms 7. Discussion 8. Conclusion 9. Conflict of Interest 10. Funding References Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract Adult neurogenesis, the generation of new neurons in the adult brain, is a fundamental process of neural plasticity, primarily occurring within specialized microenvironments known as neurogenic niches. The most well-studied of these, the subgranular zone of the hippocampus, is critical for cognitive functions like pattern separation and mood regulation. The integrity of this niche relies on a three-way cooperation between the vasculature, glial cells, and neural stem cells (NSCs). This review outlines the involved architecture of this system, examining the distinct pillars that support neurogenesis. The vascular pillar provides structural and molecular support through the neurovascular unit and key signaling molecules like VEGF and BDNF. The glial pillar, consisting of astrocytes and microglia, arranges the niche by providing metabolic homeostasis, regulating synaptic connectivity, and modulating the immune environment through phagocytosis and a context-dependent secretome. This local architecture is further governed by top-down control from neural circuits. Here, the dynamic regulation of the niche is explored, focusing on systemic factors such as physical exercise and the gut-brain axis, along with other environmental influences. The discussion then turns to how the breakdown of this tripartite alliance serves as a common pathological hub in aging, stress-related disorders, Alzheimer’s disease, and other neurological conditions. Finally, this review highlights future directions, including advanced imaging and omics technologies, and novel therapeutic paradigms aimed at harnessing the niche’s potential for brain repair, while also considering the attendant ethical and societal implications. The Neurogenic Niche: Interactions Among Vessels, Glia, and Neural Stem Cells Khodakaram Jahanbin* , M.Sc of Medical Immunology 1 1. Department of Immunology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran. Electronic address: [email protected] Abstract Adult neurogenesis, the generation of new neurons in the adult brain, is a fundamental process of neural plasticity, primarily occurring within specialized microenvironments known as neurogenic niches. The most well-studied of these, the subgranular zone of the hippocampus, is critical for cognitive functions like pattern separation and mood regulation. The integrity of this niche relies on a three-way cooperation between the vasculature, glial cells, and neural stem cells (NSCs). This review outlines the involved architecture of this system, examining the distinct pillars that support neurogenesis. The vascular pillar provides structural and molecular support through the neurovascular unit and key signaling molecules like VEGF and BDNF. The glial pillar, consisting of astrocytes and microglia, arranges the niche by providing metabolic homeostasis, regulating synaptic connectivity, and modulating the immune environment through phagocytosis and a context-dependent secretome. This local architecture is further governed by top-down control from neural circuits. Here, the dynamic regulation of the niche is explored, focusing on systemic factors such as physical exercise and the gut-brain axis, along with other environmental influences. The discussion then turns to how the breakdown of this tripartite alliance serves as a common pathological hub in aging, stress-related disorders, Alzheimer’s disease, and other neurological conditions. Finally, this review highlights future directions, including advanced imaging and omics technologies, and novel therapeutic paradigms aimed at harnessing the niche’s potential for brain repair, while also considering the attendant ethical and societal implications. Keywords: Adult Neurogenesis, Neurogenic Niche, Stem Cells, Glia, Cerebrovascular Circulation, Brain Plasticity, Neuroinflammation 1. Introduction The adult brain retains a remarkable capacity for plasticity, partially due to the formation of new neurons in specific neurogenic regions. The subgranular zone of the hippocampal dentate gyrus is the most well-investigated section, where adult hippocampal neurogenesis (AHN) has been functionally implicated in key cognitive and affective processes. A primary role attributed to AHN is pattern separation, the computational process of differentiating similar memories into distinct representations (1). Immature adult-born granule cells enhance this process by regulating the activity of mature granule cells, promoting the remapping of place cells, and improving the precision of memory encoding (2, 3). Computational models and lesion studies support this framework, demonstrating that the heightened plasticity of young neurons is integral for maintaining memory fidelity and preventing interference (4-6). The ablation of neurogenesis impairs the ability to distinguish between closely related experiences, reinforcing the importance of AHN in cognitive flexibility (7-9). In addition to cognition, AHN is linked to mood regulation and stress resilience. Chronic stress is a potent negative regulator of AHN, while many antidepressant treatments enhance the production of new neurons (10-12). However, this is not a simple causal link, as the mere addition or removal of adult-born neurons is inadequate to produce antidepressant-like effects or induce mood disorders (12). The efficacy of treatments like fluoxetine involves both neurogenesis-dependent and neurogenesis-independent mechanisms, which include increasing brain-derived neurotrophic factor (BDNF), modulating inflammatory pathways, and regulating astrocytic activity (13-15). A reciprocal relationship exists between AHN and the hypothalamus-pituitary-adrenal (HPA) axis, where neurogenesis may act as a buffer enhancing stress resilience (10, 16, 17). The regulation of this process occurs within the neurogenic niche, a specialized microenvironment where a consortium of cells maintains the necessary molecular environment (18). The foundation comprises neural stem cells (NSCs), a diverse group of radial glia-like cells that range from a state of quiescence to activation (19, 20). The behavior of NSCs is regulated by a complex interaction of signals from adjacent cells—astrocytes, microglia, and oligodendrocyte lineage cells—as well as from the vasculature and distal neural circuits (21, 22). Astrocytes provide trophic support, while microglia modulate neurogenesis through phagocytosis and cytokine release, highlighting an essential glial contribution to niche homeostasis (23-25). This architecture is embedded within a unique extracellular matrix (ECM) that provides structural support and biochemical cues to regulate NSC fate (26-29). Despite robust evidence from rodent models, the extent of AHN in humans remains controversial. Some studies report that hippocampal neurogenesis continues into the tenth decade of life, with impairments in conditions like Alzheimer’s disease (30), while others suggest it declines sharply after birth (31). This divergence is largely attributed to methodological challenges, including postmortem tissue quality and marker sensitivity (32, 33). Normalizing developmental timelines suggests primate neurogenesis may plateau at very low levels (34), making its resolution critical for translating preclinical findings to human health. This review will explore the intricate architecture and regulation of the adult neurogenic niche, focusing on the tripartite alliance between the vasculature, glial cells, and NSCs. This review will examine how this local system is modulated by systemic physiological signals and neural activity, how its dysfunction contributes to pathology, and what future paradigms may allow us to harness its potential for brain repair and plasticity. 2. The Local Niche Architecture: A Multi-Pillar System The adult neurogenic niche is a complex, multicellular ecosystem where the fate of NSCs is determined by a sophisticated interplay of local signals. This architecture is built upon a multi-pillar system comprising the vasculature, distinct glial cell populations, and regulatory neural circuits (Figure 1). The vascular system acts as a dynamic regulatory hub, facilitating bidirectional communication essential for homeostasis and integrating systemic signals through direct cell-cell interactions and soluble substances (35, 36). Astrocytes arrange a second pillar, serving as both a source of NSCs and as indispensable niche cells that provide metabolic support and secrete factors to guide neurogenesis (37, 38). The immune pillar, composed primarily of microglia, maintains homeostasis through phagocytic clearance and modulates NSC fate via a context-dependent secretome of pro- and anti-neurogenic factors (23, 39). Finally, this local machinery is subject to top-down control from neural circuits that use inhibitory, excitatory, and neuromodulatory inputs to precisely gate the stem cell pool and guide the integration of new neurons according to the brain’s computational needs (40, 41). Figure 1. Schematic illustration of the tripartite alliance in the healthy adult neurogenic niche. The central NSCs are supported by interconnected pillars: the vascular system (including endothelial cells, pericytes, and astrocyte end-feet), providing trophic factors such as BDNF and VEGF for structural and molecular support; the astrocyte pillar, facilitating metabolic homeostasis via the lactate shuttle and Wnt signaling, while protecting neurons from excitotoxicity through glutamate uptake; the immune pillar (microglia), enabling homeostatic surveillance through phagocytic clearance of apoptotic cells and secretion of pro-neurogenic factors like IGF-1; and top-down neural control, with GABAergic tonic inhibition maintaining NSC quiescence and glutamatergic activity promoting the survival and integration of newborn neurons. This multicellular ecosystem maintains neurogenesis and brain plasticity under homeostatic conditions. 2.1. The Vascular-Neural Crosstalk The vascular system within neurogenic niches acts as a dynamic regulatory pillar, extending beyond its canonical role of providing oxygen and nutrients. Neurogenic regions are characterized by high vascular density, where neural stem/progenitor cells are organized in close association with blood vessels (42, 43). This proximity facilitates bidirectional communication essential for nervous system homeostasis and repair, with shared molecular pathways coordinating the synchronic development of both systems (36, 44). Consequently, the vascular compartment serves as a hub, integrating systemic signals with local cues to influence NSC fate through both soluble blood-borne factors and direct cell-cell interactions (35). Disruptions to this neurovascular coupling are implicated in pathologies from cognitive decline to neurodegenerative diseases (36, 45). 2.1.1 Structural Components of the Vascular Niche The functional core of the vascular niche is the neurovascular unit, a multicellular interface of endothelial cells, pericytes, astrocytes, and neurons that maintains brain homeostasis (46, 47). Endothelial cells directly influence NSC fate, guiding their differentiation toward neuronal or astrocytic lineages (48, 49). Pericytes are fundamental for stabilizing the niche (as illustrated in Figure 1, vascular support pillar), where their interactions with endothelial cells regulate angiogenesis, maintain blood-brain barrier (BBB) integrity, and control capillary blood flow through pathways including PDGF, Vascular Endothelial Growth Factor (VEGF), and TGF-β (50-52). Pericyte dysfunction leads to BBB breakdown and is associated with various neurological disorders (53, 54). A key structural feature is the basement membrane, a specialized ECM that, in the subventricular zone (SVZ), forms unique structures known as fractones (55). These laminin-rich bulbs originate from ependymal cells and directly contact NSCs, acting as reservoirs that concentrate and present growth factors like FGF-2 to regulate their proliferation (28, 56-58). 2.1.2 Molecular Mediators of Neurovascular Crosstalk Bidirectional communication is orchestrated by a suite of signaling molecules. VEGF: VEGF signaling establishes a powerful positive feedback loop between angiogenesis and neurogenesis (59). It promotes angiogenesis by binding to Vascular Endothelial Growth Factor Receptor 2 (VEGFR2) on endothelial cells while simultaneously stimulating NSC proliferation and enhancing the survival of newborn neurons, in part by modulating BDNF expression (60-62). In pathological contexts like cerebral ischemia, VEGF promotes functional recovery by coordinating both vascular and neural repair (63, 64). BDNF: Cerebral endothelial cells are a major source of BDNF, providing direct trophic support for neuronal survival, maturation, and recruitment through its receptor TrkB (65, 66). Activation of the BDNF-TrkB axis triggers downstream ERK and CREB pathways, which are vital for neuronal differentiation and survival, offering broad neuroprotection against various insults (67-69). Integrin-Mediated Adhesion: NSCs anchor to the vascular basement membrane through integrin receptors, a process essential for their maintenance. In the SVZ, α6β1 integrin binds to laminin, which is crucial for maintaining NSCs in a quiescent state (70, 71). Integrin engagement activates intracellular signaling, such as the PI3K/Akt pathway, which supports cell survival and preserves the stem cell pool, and can be influenced by the mechanical properties of the basement membrane (72, 73). The decline of cardiovascular health directly compromises these signaling networks, leading to reduced trophic factor secretion and a pro-inflammatory state detrimental to tissue regeneration (74, 75). 2.2. The Astrocyte Pillar: An Essential Component Astrocytes are a fundamental pillar of the neurogenic niche, serving both as a population of NSCs themselves and as indispensable niche cells that orchestrate the neurogenic process (37, 76). They provide structural support, regulate the local microenvironment, and deliver signals controlling NSC proliferation (Figure 1, astrocyte pillar), fate determination, and neuronal integration (38). This positions astrocytes at the center of the neuro-immune-vascular axis, where they bridge communication between neurons, immune cells, and the vasculature to maintain CNS homeostasis (77). 2.2.1 Metabolic and Homeostatic Regulation A primary function of astrocytes is to maintain metabolic and ionic homeostasis. The astrocyte-neuron lactate shuttle is a key mechanism where astrocytes process glucose into lactate, which is then shuttled to neurons as an energy substrate for neurogenesis and synaptic plasticity (78-81). Astrocytes are also the primary regulators of extracellular glutamate, expressing transporters that are responsible for 80-90% of glutamate uptake, thereby protecting neurons from excitotoxicity (82-85). They then convert glutamate to glutamine, which is shuttled back to neurons to replenish neurotransmitter pools in the glutamate-glutamine cycle (86). 2.2.2 Structural and Regulatory Roles Astrocytes form an integral part of the gliovascular unit, where their end-feet ensheathe the brain’s vasculature, a critical association for inducing and maintaining BBB integrity(87, 88). They secrete factors like VEGF and TGF-β that modulate endothelial tight junctions and support vascular health (89-91). Their end-feet are enriched in aquaporin-4, which regulates water flux and is vital for preventing cerebral edema (92, 93). Astrocytes also actively shape neural circuits by secreting synaptogenic proteins like thrombospondins (94-96). Furthermore, they directly instruct NSC fate through secreted factors like Wnt proteins, which enhance neurogenesis, and juxtacrine signals like ephrin-B2, which promote neuronal differentiation (38, 97, 98). Conversely, in response to inflammation, they can secrete factors like IL-6 that shift NSC fate toward astrogliogenesis (99). 2.2.3 Reactive Astrogliosis: A Context-Dependent Response In response to CNS injury, astrocytes undergo reactive astrogliosis, a process with both beneficial and detrimental effects (100). Protectively, it leads to the formation of a glial scar that isolates damage and supports neuronal survival (101). However, in chronic pathological conditions, reactive astrocytes can adopt a neurotoxic phenotype that inhibits adaptive plasticity and exacerbates neuronal damage (102-104). 2.3. The Immune-Neural Crosstalk (Microglia) Microglia, the resident immune cells of the CNS, are dynamic regulators of the neurogenic niche. They engage in constant, bidirectional communication with other neural cells to maintain tissue homeostasis and are fundamental to processes like synaptic pruning and the regulation of adult neurogenesis (depicted in Figure 1, immune pillar) (105-108). However, while essential for clearing debris, chronic activation can drive neurotoxic inflammation, contributing to neurodegenerative disorders (109, 110). Their functional state, broadly categorized into pro-inflammatory (M1) and anti-inflammatory (M2) phenotypes, is a critical determinant of outcomes within the niche (39). 2.3.1. Phagocytic Regulation of the Stem Cell Pool A critical homeostatic function of microglia is the phagocytic clearance of apoptotic neural progenitors and newborn neurons, which is essential for maintaining the balance of the stem cell pool (111). Microglia recognize apoptotic cells via ”eat-me” —molecular cues such as externalized phosphatidylserine that mark dying cells for non-inflammatory clearance—mediated by receptors including TREM2 and MerTK (112-115). This engagement not only facilitates engulfment but also actively suppresses pro-inflammatory signaling (116, 117). Crucially, this phagocytic act is a key regulatory mechanism; phagocytosing an apoptotic cell triggers a transcriptional program in the microglia, causing it to alter its secretome to limit further neurogenesis, creating a negative feedback loop that ensures stable maintenance of the neurogenic process (23). 2.3.2. The Microglial Secretome: Pro- and Anti-Neurogenic Factors Microglia exert control over NSC fate through the release of soluble factors. In a homeostatic (M2-like) state, they release trophic factors like IGF-1, which promotes NSC proliferation and survival (118-120). In response to inflammatory stimuli, microglia adopt a pro-inflammatory (M1-like) phenotype and release cytokines detrimental to neurogenesis. IL-1β strongly inhibits NSC proliferation via its receptor, IL-1R1 (121, 122). The effect of TNF-α is uniquely pleiotropic; signaling through its TNFR1 receptor is generally inhibitory, while signaling through TNFR2 is pro-neurogenic and required for normal NSC proliferation (123-125). The net effect of TNF-α is thus determined by the balance of signaling through these two pathways. 2.3.3. Sex-Specific Regulation by Microglia Microglial function is not uniform between sexes. Adult male and female microglia display distinct transcriptomic profiles, with female microglia often exhibiting a more neuroprotective phenotype (126). During neonatal development, microglia regulate hippocampal neurogenesis in a sex-dependent manner, with their depletion impairing the process in males but not females (127). These differences may be influenced by hormonal factors and can affect brain development, potentially underlying sex-based disparities in neurological disorders (128, 129). 2.4. Top-Down Control by Neural Circuits The neurogenic niche is dynamically regulated by top-down control from local and long-range neural circuits, which act as gatekeepers linking the production of new neurons to the computational needs of the broader hippocampal network (Figure 1, neural control elements) (40, 130). 2.4.1. Inhibitory Gating and Activity-Dependent Integration The maintenance of a quiescent NSC pool is actively enforced by local inhibitory circuits, primarily driven by parvalbumin-positive interneurons that provide tonic GABAergic input to NSCs (41). This inhibitory tone holds NSCs in a dormant state; its disruption causes NSCs to exit quiescence, leading to their activation and subsequent depletion (41, 131). This system is hierarchically controlled by long-range GABAergic projections from the medial septum (131). Conversely, excitatory glutamatergic input is essential for the survival and functional integration of newly generated neurons under a ”use it or lose it” principle, where the majority of adult-born neurons undergo apoptosis unless actively recruited into circuits through learning-dependent activity (132). This survival is competitively mediated by NMDA-type glutamate receptors, ensuring that only neurons receiving salient inputs from sources like the entorhinal cortex are retained (133-135). Hippocampus-dependent spatial learning is a primary driver of this selection, coupling neurogenesis directly to cognitive demands (9, 136, 137). 2.4.2. Neuromodulatory Control Neuromodulatory systems provide another layer of control. Cholinergic inputs from the medial septum are critical for the maturation and integration of adult-born neurons (138). Newborn neurons express α7-containing nicotinic acetylcholine receptors (α7-nAChRs) and receive direct cholinergic innervation, which is essential for their survival and dendritic development (139, 140). This relationship is reciprocal: constant adult neurogenesis is necessary to preserve the integrity of the septohippocampal cholinergic circuit throughout life (141). 3. Systemic Regulation of the Niche While the local architecture provides the immediate framework for neurogenesis, the niche does not operate in isolation. Its function is dynamically sculpted by a host of systemic physiological cues and environmental factors that are integrated via the niche vasculature (Figure 2). Potent physiological stimuli like physical exercise regulate the niche by enhancing cerebral blood flow and initiating a systemic dialogue through circulating ”exerkines”—exercise-induced signaling molecules such as cytokines, metabolites, and peptides that mediate communication between peripheral organs and the brain—forming a robust body-brain axis (142, 143). The gut-brain axis represents another critical regulatory network, where the gut microbiota produces metabolites that cross the BBB to influence the niche’s immune landscape (144, 145). Furthermore, a range of lifestyle and environmental factors, including sleep, environmental enrichment, and exposure to toxins, profoundly modulate the vascular, glial, and immune components of the niche, thereby altering brain plasticity and disease susceptibility (146, 147). Figure 2. Systemic and environmental modulators of the adult neurogenic niche. (A) Pro-neurogenic inputs enhancing neurogenesis and resilience, including physical exercise (via irisin and cathepsin B, leading to increased cerebral blood flow), a healthy gut microbiome (via butyrate/SCFAs promoting an M2 anti-inflammatory microglial state), restful sleep, social interaction, and environmental enrichment. (B) Anti-neurogenic inputs impairing neurogenesis and increasing vulnerability, including chronic stress (via glucocorticoids suppressing NSC proliferation), aging (via inflammaging and cellular senescence), gut dysbiosis (via LPS from leaky gut promoting an M1 pro-inflammatory microglial state), and environmental toxins (inducing neuroinflammation and vascular damage). The central neurovascular interface (with pericytes and blood cells) integrates these signals, determining the balance between enhanced and impaired neurogenesis. 3.1. Physiological Cues (Exercise) Physical exercise is a potent physiological stimulus that regulates the neurogenic niche. A primary mechanism is the enhancement of cerebral blood flow and vascular remodeling (142, 148). This exercise-induced hyperemia is mediated by mechanical shear stress on endothelial cells, which activates eNOS signaling to increase nitric oxide bioavailability, a critical vasodilator (149-151). This enhanced perfusion is functionally linked to increased expression of VEGF (152). The VEGF-C/VEGFR3 signaling axis plays a direct role, as VEGFR3 is expressed on NSCs and its ligand, VEGF-C, is secreted by endothelial cells to activate quiescent NSCs (153, 154). In addition to direct vascular changes, exercise initiates a systemic dialogue through circulating factors, or exerkines. The myokine irisin, secreted from muscle tissue, can cross the BBB to stimulate BDNF expression in the hippocampus (155, 156). Irisin is part of a broader orchestra of peripheral factors, including cathepsin B and IGF-1, that form a robust body-brain axis, triggering cellular changes that enhance neurogenesis and cognitive function (Figure 2A) (157-159). The neurogenic response is dependent on the modality and intensity of the activity; sustained high-intensity aerobic exercise appears most effective, while the effects of resistance exercise are less pronounced and may act through different molecular pathways (160-162). 3.2. The Gut-Brain-Niche Axis The gut-brain axis is a bidirectional communication network where the gut microbiota is a central player, producing metabolites that influence neurochemistry and behavior (145, 163, 164). Disruptions in this axis have been implicated in a range of neurological conditions (165). Animal models demonstrate that gut microbiota critically influences AHN; germ-free mice exhibit impaired neurogenesis, and transplantation of microbiota from stressed mice into healthy recipients reduces AHN, underscoring the causal role of a dysbiotic microbiome (166, 167). This has led to the concept of ”psychobiotics”—probiotics capable of influencing mental health (168, 169). The influence is mediated by both humoral and neural signaling. Short-chain fatty acids—primarily acetate, propionate, and butyrate—are microbial metabolites that cross the BBB and exert profound effects on microglia (144, 170). Butyrate promotes a homeostatic microglial phenotype through histone deacetylase inhibition and G-protein coupled receptor activation, epigenetically reprogramming microglia toward a neuroprotective M2 state (171-173). The vagus nerve provides a direct anatomical link; gut microorganisms can activate vagal afferents, transmitting signals that influence brain function, including hippocampus-dependent memory and neurogenesis (174-177). Gut dysbiosis can initiate a pathological cascade beginning with the loss of intestinal barrier integrity (”leaky gut”), allowing immunogenic substances like bacterial lipopolysaccharide to enter systemic circulation (Figure 2B) (178-180). This triggers systemic inflammation and compromises the BBB by disrupting tight junctions, creating a feed-forward loop of inflammation that sustains microglial activation and creates a hostile environment for neurogenesis (181-183). 3.3. Additional Environmental and Lifestyle Factors Chronic sleep deprivation critically impairs the neurogenic niche by fostering a pro-inflammatory microenvironment. This is mechanistically linked to the robust activation of microglia, an increase in pro-inflammatory cytokines like IL-1β, and a significant decline in BDNF (184, 185). In contrast, environmental enrichment robustly enhances brain plasticity by upregulating genes associated with neurogenesis and cell survival, enhancing neurotrophin expression, and promoting resilience (146, 186, 187). Exposure to environmental toxins like air pollutants and heavy metals represents a significant threat (illustrated in Figure 2 for both positive and negative modulators). These toxins disrupt the vascular and glial pillars through neuroinflammation and oxidative stress (147, 188). Air pollution impairs neurogenesis by stimulating the activation of astrocytes and microglia, while traffic-related air pollution can cause severe vascular disruption, including a reduction in the tight junction protein ZO-1 and an increase in microhemorrhages (188-190). The interplay between lifestyle, environment, and genetics is also critical in determining risk for neuro-inflammatory diseases like multiple sclerosis (MS), where factors such as smoking, EBV infection, and obesity interact with HLA risk genes (191-193). Many of these environmental influences are modifiable, offering opportunities for disease prevention. 4. Human Translation and Comparative Biology Translating findings from rodent models to human biology presents significant challenges, rooted in species-specific differences, methodological controversies, and genetic variability. The neuro-immune-vascular interface has emerged as a critical nexus for this translation, as dynamic interactions between these systems are pivotal in maintaining homeostasis and responding to stress (194, 195). Comparative studies reveal profound differences in the organization and cellular composition of neurogenic niches, complicating direct translation from rodents, which exhibit well-defined niches, to humans, where niches appear less ordered and neurogenesis proceeds at slower rates (196). The very existence of robust adult human neurogenesis remains highly controversial, with conflicting findings largely attributable to methodological inconsistencies in postmortem tissue analysis (30, 197). Furthermore, individual variability in neurogenic capacity is significantly influenced by genetic factors, such as polymorphisms in the BDNF gene, underscoring the complex basis of neuroplasticity in humans (198). 4.1. Species-Specific Architectures of the Neurogenic Niche Comparative studies reveal profound differences in the organization of neurogenic niches across species. In rodents, the SVZ and DG are well-defined niches with a clear spatial organization of NSCs. In contrast, the primate and human niches appear less ordered, with proliferative NSCs being more dispersed (196). These architectural differences are accompanied by variations in cellular diversity and maturation timelines. For instance, human hypothalamic neurogenesis involves four distinct neural progenitor populations, whereas rodents primarily show neurogenesis derived from tanycytes (199). Furthermore, primate neurogenesis is characterized by slower rates and a significantly longer maturation period for new neurons compared to rodents, underscoring the importance of utilizing primate models for understanding human neurogenesis (200, 201). 4.2. The Controversy of Adult Human Hippocampal Neurogenesis The existence and functional significance of AHN in humans remain highly controversial. Several postmortem studies provide evidence for the persistence of AHN into old age (30, 202), but other reports suggest the rate of new neuron formation is minimal in adults (32, 197). Much of this controversy stems from methodological inconsistencies; the detection of AHN markers is critically dependent on tissue quality and processing methods (30, 203). While neuroimaging offers a non-invasive window, current techniques cannot directly visualize microscopic neurogenesis and may not effectively differentiate between new and older neurons (204, 205). 4.3. Genetic Determinants of Individual Variability Individual variability in neurogenic capacity is significantly influenced by genetic factors. A common single-nucleotide polymorphism in the BDNF gene, BDNF Val66Met , affects synaptic plasticity, with individuals carrying the Met allele often showing altered responses to neuroplasticity-inducing interventions and reduced motor learning rates (198, 206, 207). Beyond BDNF , polymorphisms in other genes, including those for VEGF and the Notch signaling pathway, contribute to this variability by affecting angiogenesis and progenitor cell division, respectively (208-210). This interplay of genetic and environmental factors underscores the complex basis of individual differences in neurogenic capacity (211). 5. The Breakdown of the Alliance: Pathological Hubs Given its critical role in brain plasticity, the deterioration of the neurogenic niche is a central feature and common pathological hub across a wide spectrum of neurological disorders. In the context of physiological aging, the niche undergoes a significant decline driven by interconnected processes including vascular senescence, chronic low-grade inflammation (”inflammaging”), and the accumulation of senescent cells (212, 213). In conditions like chronic stress and depression, neuroinflammatory processes degrade the niche’s integrity through mechanisms such as HPA axis dysregulation and glucocorticoid-mediated suppression of NSCs (214). In neurodegenerative disorders such as Alzheimer’s and Parkinson’s disease, disease-specific pathologies converge to dismantle the tripartite alliance, transforming a site of plasticity into a driver of disease progression through chronic neuroinflammation, BBB disruption, and aberrant stem cell responses (Figure 3A) (215, 216). 5.1. The Aging Niche Aging precipitates a significant decline in the functional integrity of the neurogenic niche. This deterioration involves a cascade of interconnected processes, including vascular senescence, chronic low-grade inflammation (inflammaging), the accumulation of senescent cells, and epigenetic alterations. Vascular Deterioration: The age-related decline of the vascular system is a primary driver of neurogenic failure. Neurovascular aging manifests as impaired oxygen delivery, compromised protein clearance, and BBB disruption, which facilitates the infiltration of peripheral immune cells and exacerbates neuroinflammation (212, 217, 218). Arterial stiffness and endothelial dysfunction promote a pre-atherogenic state and are mechanistically linked to impaired angiogenesis and pathological microcirculatory remodeling (219-221). Inflammaging and Primed Glia: Aging is characterized by inflammaging, a state of chronic, low-grade inflammation. Within the aging brain, microglia transition to a ”primed” state—an altered phenotype marked by exaggerated sensitivity to stimuli and amplified inflammatory output—exhibiting a heightened and prolonged inflammatory response to stimuli, resulting in the sustained production of pro-inflammatory cytokines that contribute to cognitive deficits (213, 222, 223). Aged microglia also experience defects in homeostatic functions like phagocytosis, creating a self-perpetuating cycle of neuroinflammation and neurotoxicity (224, 225). Cellular Senescence: Senescent cells, including astrocytes, microglia, and NSCs, accumulate in the aging brain and adopt a senescence-associated secretory phenotype (SASP) (226, 227). The SASP consists of secreted pro-inflammatory factors that foster neuroinflammation and tissue dysfunction (228, 229). Senescent astrocytes, for example, downregulate critical glutamate transporters, leading to excitotoxicity (230). Epigenetic Drift: Aging is accompanied by a dysregulation of transcriptional and chromatin networks, termed ”epigenetic drift” (231). These alterations in the epigenetic landscape of NSCs contribute to their diminished proliferation and increased quiescence, while compromised signaling from aging niche cells accelerates this decline, leading to a collapse of tissue homeostasis (232, 233). 5.2. Stress and Depression Chronic stress is a potent catalyst for neuroinflammatory processes that degrade the niche’s integrity and contribute to major depressive disorder. The Neuroimmunoinflammatory Stress Model posits that depression represents a terminal stage of chronic stress, marked by sustained pro-inflammatory responses that culminate in neuroinflammation (214). This involves dysregulation of the HPA axis and heightened inflammation in key mood-regulating brain regions (234). A primary consequence is the elevation of glucocorticoids, which potently suppress NSC proliferation by activating GRs on NSCs, triggering cell cycle arrest in the G1/G0 phase through the degradation of cyclin D1 and upregulation of inhibitory genes (235-237). Microglia play a pivotal role, as elevated glucocorticoids can prime them toward a pro-inflammatory state via a GR-NF-κB-NLRP3 inflammasome pathway (238). Chronic stress also significantly disrupts trophic support, most notably by reducing the expression of BDNF through multiple convergent mechanisms involving glial and vascular dysfunction, including epigenetic suppression of BDNF transcription (239-241). Encouragingly, interventions like mindfulness and exercise can modulate these pathways, highlighting the plasticity of the niche as a therapeutic target for stress-related disorders (242, 243). 5.3. Alzheimer’s Disease (AD) In AD, the pathological accumulation of amyloid-β (Aβ) and hyperphosphorylated tau dismantles the neurogenic niche. The effect of Aβ oligomers on NSCs is complex; high concentrations induce apoptosis, DNA damage, and oxidative stress, yet some studies report context-dependent neurogenic-promoting effects (244-246). The vascular pillar is severely compromised through cerebral amyloid angiopathy, where Aβ accumulates within cerebral blood vessel walls, impairing Aβ clearance, undermining the neurovascular unit, and leading to BBB compromise and chronic cerebral hypoperfusion (215, 247, 248). Hyperphosphorylated tau also becomes a disruptive force, impeding microtubule dynamics and eliciting neuroinflammatory responses (249-251). Finally, chronic neuroinflammation, driven by microglial activation in response to Aβ plaques, creates a hostile ”cytokine storm”—an excessive and dysregulated release of pro-inflammatory cytokines that overwhelms homeostatic signaling—directly suppressing AHN and transforming the niche into one that actively promotes neurodegeneration (Figure 3A) (252-254). 5.4. Broader Pathologies and Comorbidities Breakdown of the tripartite alliance is a common pathological hub across a spectrum of neurological disorders. Parkinson’s Disease (PD): Cognitive deficits arise from neurovascular decoupling, dysregulated microglial activation that creates a vicious cycle with dying neurons, and vascular pathology, including a compromised BBB (216, 255, 256). Traumatic Brain Injury (TBI): TBI triggers an acute activation of NSCs, but this regenerative attempt is often thwarted as differentiation is skewed toward an astrocytic fate. The chronic phase is characterized by a glial scar and persistent neuroinflammation that suppresses NSC proliferation and compromises recovery (257-259). Epilepsy: Seizures profoundly disrupt hippocampal neurogenesis, transforming it into a pathological driver. The neurogenesis that occurs is aberrant, with newborn granule cells displaying persistent immaturity, migrating to ectopic locations, and contributing to network hyperexcitability, making it pro-epileptogenic rather than reparative (260-262). Vascular and Demyelinating Disorders: In conditions like vascular cognitive impairment and MS, immune-mediated neurovascular dysfunction is a primary driver. Dysregulated glial activation and infiltration of inflammatory cells promote white matter degeneration, while systemic vascular comorbidities are linked to greater disability, highlighting a bidirectional relationship between peripheral vascular health and central neurodegeneration (see Figure 3 for a summary of niche breakdown across pathologies) (263, 264). Figure 3. Dysfunction and therapeutic restoration of the neurogenic niche. (A) Pathological state in conditions such as aging, chronic stress, or Alzheimer’s disease, depicting a deteriorated niche with senescent or apoptotic NSCs, compromised BBB integrity and cerebral amyloid angiopathy, neurotoxic reactive astrogliosis, and pro-inflammatory (M1-like) microglia releasing cytokines (e.g., IL-1β, TNF-α), amid hallmarks like Aβ plaques, neurofibrillary tangles, and chronic neuroinflammation. This leads to suppressed neurogenesis, exacerbated pathology, and cognitive decline. (B) Therapeutically restored state following interventions such as senolytics (for senescent cell clearance), microglial modulation (e.g., via CSF1R inhibitors), mesenchymal stem cell (MSC)-derived exosomes, and lifestyle factors (e.g., exercise, diet), showing rejuvenated NSCs with active proliferation, restored BBB integrity, homeostatic astrocytes, and anti-inflammatory (M2-like) microglia releasing trophic factors (e.g., IGF-1, BDNF). This results in reduced inflammation, enhanced neurogenesis, and potential for brain repair. 6. Future Directions and Therapeutic Paradigms Overcoming the challenges posed by niche dysfunction in aging and disease requires the development and application of innovative technologies and therapeutic strategies that can precisely probe and manipulate this complex microenvironment. Breakthroughs in advanced imaging, such as intravital multiphoton microscopy, combined with sophisticated genetic labeling strategies, are pivotal for visualizing dynamic cellular processes in living systems (265, 266). The convergence of high-throughput omics with systems biology is providing an unprecedented, holistic understanding of the niche’s regulatory networks (267). This deeper understanding is paving the way for novel therapeutic strategies—ranging from targeted microglial modulation and cell-free exosomes to gene therapy—that aim to restore niche function (268, 269). As these powerful interventions emerge, they bring a complex landscape of ethical and societal challenges, demanding proactive deliberation on issues of patient safety, equity, and public policy to ensure responsible translation (Figure 3) (270, 271). 6.1. Advanced Imaging and Labeling Strategies Breakthroughs in imaging have been pivotal in revealing the intricate crosstalk within the niche. Intravital multiphoton microscopy (MPM) enables longitudinal tracking of interactions between immune cells, glia, neurons, and the vasculature in living systems (265, 272). Three-photon microscopy has enabled non-invasive deep-brain imaging of the mouse SVZ, detecting direct NSC-vasculature interactions (273). Complementing MPM are other modalities like super-resolution microscopy and PET, while the integration of AI is enhancing the interpretation of imaging data (274, 275). The power of these techniques is magnified by sophisticated genetic labeling strategies, including multicolor reporters like Brainbow and CRISPR-based tools that allow for efficient gene targeting and real-time cellular tracking in NSC research (266, 276, 277). 6.2. Omics and Systems Biology Approaches The convergence of high-throughput omics with systems biology provides a holistic understanding of the niche. Single-cell RNA sequencing (scRNA-seq) has revolutionized the characterization of cellular heterogeneity, revealing that NSCs exist as a complex continuum rather than discrete populations (19, 278). Spatial omics methodologies add a critical layer of contextual information, allowing for the analysis of cell-cell interactions in their native tissue architecture (279). Proteomic analyses offer a lens to examine functional changes during aging, revealing widespread alterations in immune proteins and the stoichiometry of essential protein complexes, leading to the concept of a ”proteomic aging clock”—a computational model that estimates biological age based on age-associated patterns in protein expression, offering insights into systemic aging and potential biomarkers for age-related diseases (280, 281). Computational models are indispensable for integrating these vast datasets to simulate niche dynamics and predict therapeutic outcomes (282, 283). 6.3. Novel Therapeutic Strategies Recent advances have spurred the development of interventions aimed at modulating the core components of the niche. A prominent strategy involves the targeted depletion of microglia using CSF1R inhibitors, followed by repopulation with new, more homeostatic microglia, which shows promise in models of AD, PD, and MS (268, 284). An alternative is the selective elimination of senescent microglia using senolytic drugs, which can reduce neuroinflammation and improve cognitive performance (285, 286). Modulating neurovascular and immune crosstalk—such as through intranasal delivery strategies that influence central inflammatory pathways (287), or via biomaterial-based approaches that promote microglial reprogramming and neurovascular repair (288)—represents a promising frontier for therapeutic intervention in neuroinflammatory conditions. Other promising approaches include cell-free therapeutics like MSC-derived exosomes, repurposing of cardiovascular drugs like statins, systemic interventions like caloric restriction, and gene therapy using AAV vectors to deliver neurotrophic factors (Figure 3B) (269, 289-291). 6.4. Ethical and Societal Implications Advancements in manipulating the neurogenic niche usher in a complex landscape of ethical, legal, and societal challenges (270). Stem cell-based strategies raise concerns about patient safety, the potential for exploitation through unproven treatments, and long-term risks such as tumorigenesis, demanding robust regulatory oversight (292, 293). A critical societal challenge is ensuring equitable access to these interventions. Social, economic, and environmental factors are powerful determinants of brain health, and translational research must integrate equity as a primary goal to avoid creating new frontiers in health disparities (271, 294, 295). The prospect of restoring neurogenesis to extend cognitive healthspan necessitates a paradigm shift in public health policy toward proactive, preventive care, while ensuring that the social determinants of health are addressed to safeguard public welfare as these powerful new technologies emerge (296-298). Table 1. Key components and regulation of the adult neurogenic niche. This table summarizes the primary pillars that constitute the neurogenic niche, including their key structural elements, primary functions, critical molecular mediators, and their roles in various pathological states as discussed in this review. Vascular Pillar Neurovascular unit (endothelial cells, pericytes, astrocytes); high vascular density; basement membrane; fractones (in SVZ). - Integrates systemic signals with local cues (35, 36). - Guides NSC fate and differentiation (48, 49). - Maintains blood-brain barrier (BBB) integrity (50-52). - VEGF (59-62) - BDNF (65, 66) - Integrins (70, 71) - TGF-β (50-52) - Aging: Vascular senescence, BBB breakdown, reduced perfusion (212, 217, 218). - AD: Cerebral amyloid angiopathy, impaired Aβ clearance (215, 247, 248). - PD: Neurovascular decoupling (215, 216). Glial Pillar: Astrocytes Radial glia-like cells (serve as NSCs); astrocytic end-feet form the gliovascular unit. - Serve as a source of NSCs (37, 38). - Provide metabolic support (lactate shuttle) (78-81). - Maintain homeostasis (glutamate uptake) (82-85). - Secrete factors to guide NSC fate & neuronal integration (37, 38). - Wnt proteins (97) - Ephrin-B2 (98) - Thrombospondins (94-96) - IL-6 (inflammation) (99) - Injury/Disease: Reactive astrogliosis forms a glial scar that can be both protective and inhibitory (100, 101). - Aging: Senescent astrocytes can become neurotoxic (226, 227, 230). Glial Pillar: Microglia (Immune) Resident immune cells of the CNS; exist in homeostatic (M2-like) and pro-inflammatory (M1-like) states. - Maintain homeostasis via synaptic pruning (105-108). - Phagocytic clearance of apoptotic cells, creating a negative feedback loop on neurogenesis (23, 111). - Pro-neurogenic: IGF-1 (118-120), TNFR2 signaling (123-125). - Anti-neurogenic: IL-1β (121, 122), TNF-α (via TNFR1) (123-125). - Aging: ”Inflammaging” and transition to a primed, pro-inflammatory state (213, 222, 223). - Stress/Depression: Drive neuroinflammation (214). - AD: Chronic activation creates a hostile ”cytokine storm” (252-254). Top-Down Control: Neural Circuits Local inhibitory interneurons (e.g., Parvalbumin+); long-range GABAergic and cholinergic projections; excitatory glutamatergic inputs. - Inhibitory Gating: Tonic GABAergic input maintains NSC quiescence (41, 131). - Activity-Dependent Integration: Glutamatergic input promotes survival of active new neurons (”use it or lose it”) (132). - Neuromodulation: Cholinergic input is critical for maturation (138). - GABA - Glutamate (NMDA receptors) (133-135). - Acetylcholine (α7-nAChRs) (139, 140). - Epilepsy: Seizures lead to aberrant neurogenesis, where new neurons become pro-epileptogenic (260-262). - Disruption of inhibitory tone can lead to NSC pool depletion (41). Systemic & Environmental Regulation Gut microbiota; skeletal muscle; peripheral immune system. Influenced by diet, sleep, and toxins. - Exercise: Enhances cerebral blood flow and trophic factor release (142, 143). - Gut-Brain Axis: Microbial metabolites modulate microglial function (144, 145). - Exerkines: Irisin, Cathepsin B (155-159). - Microbial Metabolites: Short-chain fatty acids (e.g., Butyrate) (171-173). - Dysbiosis/Leaky Gut: Can lead to systemic inflammation and BBB compromise (178-183). - Chronic Stress: Elevates glucocorticoids, suppressing neurogenesis (235-237). - Toxins: Drive neuroinflammation and oxidative stress (147, 188). 7. Discussion The adult neurogenic niche demonstrates the brain’s enduring capacity for plasticity, facilitated by a dynamic collaboration of vascular, glial, and NSCs. This study has reviewed the evidence demonstrating that the niche is not a static entity but a highly integrated system responsive to a vast array of local and systemic signals. The vascular pillar emerges as a critical conduit, translating systemic physiological states into molecular signals that directly affect NSC fate (35, 36). Simultaneously, glial cells—astrocytes and microglia—act as the primary architects and custodians of the local microenvironment, providing metabolic support, clearing debris, and shaping the neuro-immune landscape through a complex secretome that can either promote or inhibit neurogenesis (as summarized in Figure 1 for the healthy state) (23, 37). The integration of these pillars with top-down control from neural circuits ensures that the production of new neurons is tightly aligned with the brain’s functional needs (as contrasted in Figure 3) (40). A central theme is the profound impact of systemic factors, which highlights that brain health is inherently linked to whole-body physiology. Interventions like physical exercise and lifestyle factors modulated through the gut-brain axis highlight potent, non-invasive methods for promoting a pro-neurogenic environment (Figure 2) (143, 144). Conversely, the breakdown of this alliance serves as a common pathological hub across a range of disorders. In aging, stress, and neurodegenerative diseases like Alzheimer’s, a convergence of vascular deterioration, chronic neuroinflammation, and cellular senescence transforms the niche from a source of resilience into a driver of pathology (212-215). This convergence suggests that therapeutic strategies targeting the fundamental components of the niche—such as modulating microglial activity or restoring vascular integrity—may offer broad benefits across multiple disease contexts. However, the path to clinical translation is complicated by significant species-specific differences in niche architecture and the ongoing controversy surrounding the extent of human adult neurogenesis (30, 196, 197). Overcoming these challenges will require the continued development of advanced imaging and multi-omics technologies to provide a clearer vision of the human niche. As we move toward therapeutic paradigms capable of manipulating this complex system, it is essential to proactively address the associated ethical and societal challenges to ensure that the benefits are realized responsibly and equitably. 8. Conclusion The adult neurogenic niche is a highly dynamic and integrated hub where a tripartite alliance of vascular, glial, and stem cells fuels brain plasticity. Its function is highly sensitive to both local regulation by neural circuits and modulation by systemic physiological and environmental factors. 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Google Scholar Information & Authors Information Version history V1 Version 1 18 October 2025 Peer review timeline Published Stem Cells International Version of Record 12 Apr 2026 Published Copyright This work is licensed under a Non Exclusive No Reuse License. Keywords adult neurogenesis glia neurogenic niche Authors Affiliations Khodakaram Jahanbin 0000-0001-8460-3850 [email protected] Ahvaz Jundishapur University of Medical Sciences View all articles by this author Metrics & Citations Metrics Article Usage 552 views 191 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Khodakaram Jahanbin. The Neurogenic Niche: Interactions Among Vessels, Glia, and Neural Stem Cells. Authorea . 18 October 2025. DOI: https://doi.org/10.22541/au.176081250.01618371/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. 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