Translator Disclaimer
1 May 2003 Transforming Growth Factor β3 Regulates the Dynamics of Sertoli Cell Tight Junctions Via the p38 Mitogen-Activated Protein Kinase Pathway
Author Affiliations +
Abstract

Earlier studies have implicated the significance of transforming growth factor-β3 (TGFβ3) in the regulation of Sertoli cell tight junction (TJ) dynamics, possibly via its inhibitory effects on the expression of occludin, claudin-11, and zonula occludens-1 (ZO-1). Yet the mechanism by which TGFβ3 regulates the Sertoli cell TJ-permeability barrier is not known. Using techniques of semiquantitative reverse transcription-PCR (RT-PCR), immunoblotting, immunohistochemistry, and inhibitors against different kinases coupled with physiological techniques to assess the Sertoli cell TJ barrier function, it was shown that this TGFβ3-induced effect on Sertoli cell TJ dynamics is mediated via the p38 mitogen-activated protein (MAP) kinase pathway. First, the assembly of the Sertoli cell-TJ barrier was shown to be associated with a transient but significant decline in both the TGFβ3 production and expression by Sertoli cells. Furthermore, addition of TGFβ3 to Sertoli cell cultures during TJ assembly indeed perturbed the TJ barrier with an IC50 at ∼9 pM. Second, the TGFβ3-induced disruption of the TJ barrier was associated with a transient induction in MEKK2 but not the other upstream signaling molecules that mediate TGFβ3 action, such as Smad2, Cdc42, Rac2, and N-Ras, suggesting this effect might be mediated via the p38 MAP kinase pathway. This postulate was confirmed by the observation that TGFβ3 also induced the protein level of the activated and phosphorylated form of p38 MAP kinase at the time the TJ barrier was perturbed. Third, and perhaps the most important of all, this TGFβ3-mediated inhibitory effect on the TJ barrier and the TGFβ3-induced p-p38 MAP kinase production could be blocked by SB202190, a specific p38 MAP kinase inhibitor, but not U0126, a specific MEK1/2 kinase inhibitor. These results thus unequivocally demonstrate that TGFβ3 utilizes the p38 MAP kinase pathway to regulate Sertoli cell TJ dynamics.

Wing-yee Lui, Will M. Lee, and C. Yan Cheng "Transforming Growth Factor β3 Regulates the Dynamics of Sertoli Cell Tight Junctions Via the p38 Mitogen-Activated Protein Kinase Pathway," Biology of Reproduction 68(5), 1597-1612, (1 May 2003). https://doi.org/10.1095/biolreprod.102.011387
Received: 20 September 2002; Accepted: 1 November 2002; Published: 1 May 2003
JOURNAL ARTICLE
16 PAGES

This article is only available to subscribers.
It is not available for individual sale.
+ SAVE TO MY LIBRARY

SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top