Potent and Rapid Activation of Tropomyosin-receptor Kinase A in Endometrial Stromal Fibroblasts by Seminal Plasma

Overview

Journal Biol Reprod

Publisher Oxford University Press

Specialty Reproductive Medicine

Date 2018 Mar 9

PMID 29518187

Authors

Jeremy W Martin

Joseph C Chen

Jason Neidleman

Keiji Tatsumi

James Hu

Linda C Giudice

Warner C Greene

Nadia R Roan

Affiliations

Soon will be listed here.

Abstract

Seminal plasma (SP), the liquid fraction of semen, is not mandatory for conception, but clinical studies suggest that SP improves implantation rates. Prior in vitro studies examining the effects of SP on the endometrium, the site of implantation, surprisingly revealed that SP induces transcriptional profiles associated with neurogenesis. We investigated the presence and activity of neurogenesis pathways in the endometrium, focusing on TrkA, one of the canonical receptors associated with neurotrophic signaling. We demonstrate that TrkA is expressed in the endometrium. To determine if SP activates TrkA signaling, we isolated the two most abundant endometrial cell types-endometrial epithelial cells (eEC) and endometrial stromal fibroblasts (eSF)-and examined TrkA activity in these cells after SP exposure. While SP only moderately activated TrkA in eEC, it potently and rapidly activated TrkA in eSF. This activation occurred in both non-decidualized and decidualized eSF. Blocking this pathway resulted in dysregulation of SP-induced cytokine production by eSF. Surprisingly, while the canonical TrkA agonist nerve growth factor was detected in SP, TrkA activation was principally induced by a 30-100-kDa protein whose identity remains to be established. Our results show that TrkA signaling is highly active in eSF and is rapidly induced by SP.

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