Immune mediators of chronic pelvic pain syndrome

In: Nature Reviews Urology · 2014 · vol. 11(5) , pp. 259–269 · doi:10.1038/nrurol.2014.63 · PMID:24686526 · W2027329477
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Chronic pelvic pain syndrome may involve mast cell activation, potentially initiated by bacteria, leading to T-cell dysregulation, autoimmunity, and neural sensitization.

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This paper reviews immune mediators and mechanisms underlying chronic pelvic pain syndrome (CPPS), an umbrella diagnosis for prostatitis types IIIa/IIIb affecting up to 16% of men, focusing on how inflammation may be initiated even when disease is diagnosed as “abacterial.” It proposes that early infection could trigger mast-cell–mediated inflammation in the prostate, leading to loss of regulatory CD4+ T-cell control, constitutively active mast cells, reduced self-tolerance, and subsequent neural sensitization mediated by mast-cell factors such as tryptase and nerve growth factor. A key caveat stated is that despite substantial biomarker and immunological classification studies using human samples, no diagnostically beneficial biomarkers have been identified and the mechanisms remain incompletely established. Relevance to endometriosis: the paper does not explicitly discuss endometriosis or adenomyosis; it was included in the corpus via a keyword match around chronic pelvic pain and immune/neuroinflammatory mechanisms.

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Abstract

The cause of chronic pelvic pain syndrome (CPPS) has yet to be established. Since the late 1980s, cytokine, chemokine, and immunological classification studies using human samples have focused on identifying biomarkers for CPPS, but no diagnostically beneficial biomarkers have been identified, and these studies have done little to deepen our understanding of the mechanisms underlying chronic prostatic pain. Given the large number of men thought to be affected by this condition and the ineffective nature of current treatments, there is a pressing need to elucidate these mechanisms. Prostatitis types IIIa and IIIb are classified according to the presence of pain without concurrent presence of bacteria; however, it is becoming more evident that, although levels of bacteria are not directly associated with levels of pain, the presence of bacteria might act as the initiating factor that drives primary activation of mast-cell-mediated inflammation in the prostate. Mast cell activation is also known to suppress regulatory T cell (Treg) control of self-tolerance and also activate neural sensitization. This combination of established autoimmunity coupled with peripheral and central neural sensitization can result in the development of multiple symptoms, including pelvic pain and bladder irritation. Identifying these mechanisms as central mediators in CPPS offers new insight into the prospective treatment of the disease.
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Abstract

The cause of chronic pelvic pain syndrome (CPPS) has yet to be established. Since the late 1980s, cytokine, chemokine, and immunological classification studies using human samples have focused on identifying biomarkers for CPPS, but no diagnostically beneficial biomarkers have been identified, and these studies have done little to deepen our understanding of the mechanisms underlying chronic prostatic pain. Given the large number of men thought to be affected by this condition and the ineffective nature of current treatments, there is a pressing need to elucidate these mechanisms. Prostatitis types IIIa and IIIb are classified according to the presence of pain without concurrent presence of bacteria; however, it is becoming more evident that, although levels of bacteria are not directly associated with levels of pain, the presence of bacteria might act as the initiating factor that drives primary activation of mast-cell-mediated inflammation in the prostate. Mast cell activation is also known to suppress regulatory T cell (Treg) control of self-tolerance and also activate neural sensitization. This combination of established autoimmunity coupled with peripheral and central neural sensitization can result in the development of multiple symptoms, including pelvic pain and bladder irritation. Identifying these mechanisms as central mediators in CPPS offers new insight into the prospective treatment of the disease. This is a preview of subscription content, access via your institution Access options Subscribe to this journal Receive 12 print issues and online access 176,64 € per year only 14,72 € per issue Buy this article - Purchase on SpringerLink - Instant access to the full article PDF. 39,95 € Prices may be subject to local taxes which are calculated during checkout Similar content being viewed by others

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Corresponding author Ethics declarations Competing interests The authors declare no competing financial interests. Rights and permissions About this article Cite this article Murphy, S., Schaeffer, A. & Thumbikat, P. Immune mediators of chronic pelvic pain syndrome. Nat Rev Urol 11, 259–269 (2014). https://doi.org/10.1038/nrurol.2014.63 Published: Issue date: DOI: https://doi.org/10.1038/nrurol.2014.63

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