Reduced Sympathetic Innervation in Endometriosis is Associated to Semaphorin 3C and 3F Expression

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Endometriotic tissue shows reduced noradrenergic innervation and increased semaphorin 3C and 3F expression, potentially influencing nerve repellent effects.

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This paper investigated noradrenergic sympathetic nerve innervation and the expression of class 3 semaphorins and their receptors in peritoneal endometriotic tissue, using tissue analyses that examined where these molecules are expressed. The authors found reduced sympathetic/noradrenergic innervation alongside a significant increase in semaphorin 3C and 3F (and their receptors), with receptor expression localized to the membranes of noradrenergic nerve fibers and vessels, while macrophages and activated fibroblasts were present at higher density and also expressed semaphorins. They propose that the inflammatory environment in endometriosis could increase semaphorin release from immune and stromal cells, which may influence innervation. This paper is centrally about endometriosis — it links reduced sympathetic innervation to semaphorin 3C and 3F expression in peritoneal endometriotic tissue.

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Abstract

Endometriosis is a chronic inflammatory disease and one of the most common causes of pelvic pain. The mechanisms underlying pain emergence or chronic inflammation during endometriosis remain unknown. Several chronic inflammatory diseases including endometriosis show reduced amounts of noradrenergic nerve fibers. The source of the affected innervation is still unclear. Semaphorins represent potential elicitors, due to their known role as axonal guidance cues, and are suggested as nerve repellent factors in different chronic inflammatory diseases. Therefore, semaphorins might influence the progress of neuroinflammatory mechanisms during endometriosis. Here, we analyzed the noradrenergic innervation and the expression of the specific semaphorins and receptors possibly involved in the neuroimmunomodulation in endometriosis. Our studies revealed an affected innervation and a significant increase of semaphorins and their receptors in peritoneal endometriotic tissue. Thereby, the expression of the receptors was identified on the membrane of noradrenergic nerve fibers and vessels. Macrophages and activated fibroblasts were found in higher density levels and additionally express semaphorins in peritoneal endometriotic tissue. Inflammation leads to an increased release of immune cells, which secrete a variety of inflammatory factors capable of affecting innervation. Therefore, our data suggests that the chronic inflammatory condition in endometriosis might contribute to the increase of semaphorins, which could possibly affect the innervation in peritoneal endometriosis. Similar content being viewed by others

References

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Author information Authors and Affiliations Corresponding author Ethics declarations Conflict of Interest The authors declare that they have no conflict of interest. Rights and permissions About this article Cite this article Scheerer, C., Frangini, S., Chiantera, V. et al. Reduced Sympathetic Innervation in Endometriosis is Associated to Semaphorin 3C and 3F Expression. Mol Neurobiol 54, 5131–5141 (2017). https://doi.org/10.1007/s12035-016-0058-1 Received: Accepted: Published: Issue date: DOI: https://doi.org/10.1007/s12035-016-0058-1

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endometriosis

MeSH descriptors

Endometriosis Nerve Fibers Pain Semaphorins Adult Carrier Proteins Carrier Proteins Endometriosis Female Humans Macrophages Macrophages Male Middle Aged Nerve Fibers Neurogenesis Neurogenesis Pain Pain Semaphorins

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