Mechanism of pain generation for endometriosis-associated pelvic pain

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Neurotrophins and their receptors are overexpressed in endometriosis, contributing to hyperinnervation and chronic pelvic pain via inflammation and excessive sensory nerve development.

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This review article synthesizes existing literature to elucidate the mechanisms underlying pain generation in endometriosis-associated pelvic pain. It highlights that neurotrophins, such as NGF and BDNF, are overexpressed in endometriotic lesions alongside their receptors, facilitating excessive sensory innervation by unmyelinated C fibers and myelinated Adelta fibers. The authors conclude that an inflammatory milieu within these lesions drives hyperinnervation, which is a primary contributor to chronic pain pathophysiology. This paper is centrally about endometriosis — specifically focusing on the neurobiological mechanisms of pain associated with the disease.

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Abstract

PURPOSE: Endometriosis-associated pelvic pain appears due to persistent nociceptive stimulation, but the precise mechanisms remain poorly understood. METHODS: A search was conducted to screen and select articles from PubMed. MAIN RESULTS: Neurotrophins (NTs), a family of neuronal growth factors, are overexpressed in endometriosis and encompass NGF, BDNF and NT-3 and NT-4/5. NT receptors, TrkA and p75NTR, and NT receptor-interacting proteins, MAGE and NDN, were also expressed. NTs and their receptors play a role in the development and maintenance of neural tissues in non-neuronal cell types such as endometriosis. Nerve fibers contain unmyelinated sensory C, myelinated sensory Adelta and adrenergic nerve fibers that innervate abnormal cell growths. An increased release of proinflammatory cytokines from endometriotic lesions is responsible for the excessive sensory innervation and development of chronic pelvic pain. CONCLUSIONS: The preponderance of the inflammatory milieu and subsequent hyperinnervation might be involved in the pathophysiology of pain generation in women with endometriosis.
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Abstract

Purpose Endometriosis-associated pelvic pain appears due to persistent nociceptive stimulation, but the precise mechanisms remain poorly understood.

Methods

A search was conducted to screen and select articles from PubMed. Main results Neurotrophins (NTs), a family of neuronal growth factors, are overexpressed in endometriosis and encompass NGF, BDNF and NT-3 and NT-4/5. NT receptors, TrkA and p75NTR, and NT receptor-interacting proteins, MAGE and NDN, were also expressed. NTs and their receptors play a role in the development and maintenance of neural tissues in non-neuronal cell types such as endometriosis. Nerve fibers contain unmyelinated sensory C, myelinated sensory Adelta and adrenergic nerve fibers that innervate abnormal cell growths. An increased release of proinflammatory cytokines from endometriotic lesions is responsible for the excessive sensory innervation and development of chronic pelvic pain.

Conclusions

The preponderance of the inflammatory milieu and subsequent hyperinnervation might be involved in the pathophysiology of pain generation in women with endometriosis. Similar content being viewed by others

References

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Baillieres Clin Obstet Gynaecol 9:769–774 Acknowledgments The present review was supported by grant-in-aid for Scientific Research from the Ministry of Education, Science, and Culture of Japan to the Department of Obstetrics and Gynecology, Nara Medical University (to H.K.). Conflict of interest The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. Author information Authors and Affiliations Corresponding author Rights and permissions About this article Cite this article Kobayashi, H., Yamada, Y., Morioka, S. et al. Mechanism of pain generation for endometriosis-associated pelvic pain. Arch Gynecol Obstet 289, 13–21 (2014). https://doi.org/10.1007/s00404-013-3049-8 Received: Accepted: Published: Issue date: DOI: https://doi.org/10.1007/s00404-013-3049-8

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endometriosischronic_pelvic_pain

MeSH descriptors

Chronic Pain Endometriosis Nerve Growth Factors Pelvic Pain Chronic Pain Chronic Pain Endometriosis Endometriosis Endometriosis Female Humans Nerve Fibers Nerve Fibers Nerve Fibers Nerve Growth Factors Pelvic Pain Pelvic Pain Pelvic Pain

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