Suppression of TCF4 Promotes a ZC3H12A-mediated Self-sustaining Inflammatory Feedback Cycle Involving IL-17RA/IL-17RE Epidermal Signaling

Overview

Journal JCI Insight

Specialties Biomedical Engineering
General Medicine

Date 2024 Mar 12

PMID 38470486

Authors

Yanyun Jiang

Dennis Gruszka

Chang Zeng

William R Swindell

Christa Gaskill

Christian Sorensen

Whitney Brown

Roopesh Singh Gangwar

Lam C Tsoi

Joshua Webster

Sigrun Laufey Sigurdardottir

Mrinal K Sarkar

Ranjitha Uppala

Austin Kidder

Xianying Xing

Olesya Plazyo

Enze Xing

Allison C Billi

Emanual Maverakis

J Michelle Kahlenberg

Johann E Gudjonsson

Nicole L Ward

Affiliations

Soon will be listed here.

Abstract

IL-17C is an epithelial cell-derived proinflammatory cytokine whose transcriptional regulation remains unclear. Analysis of the IL17C promoter region identified TCF4 as putative regulator, and siRNA knockdown of TCF4 in human keratinocytes (KCs) increased IL17C. IL-17C stimulation of KCs (along with IL-17A and TNF-α stimulation) decreased TCF4 and increased NFKBIZ and ZC3H12A expression in an IL-17RA/RE-dependent manner, thus creating a feedback loop. ZC3H12A (MCPIP1/Regnase-1), a transcriptional immune-response regulator, also increased following TCF4 siRNA knockdown, and siRNA knockdown of ZC3H12A decreased NFKBIZ, IL1B, IL36G, CCL20, and CXCL1, revealing a proinflammatory role for ZC3H12A. Examination of lesional skin from the KC-Tie2 inflammatory dermatitis mouse model identified decreases in TCF4 protein concomitant with increases in IL-17C and Zc3h12a that reversed following the genetic elimination of Il17c, Il17ra, and Il17re and improvement in the skin phenotype. Conversely, interference with Tcf4 in KC-Tie2 mouse skin increased Il17c and exacerbated the inflammatory skin phenotype. Together, these findings identify a role for TCF4 in the negative regulation of IL-17C, which, alone and with TNF-α and IL-17A, feed back to decrease TCF4 in an IL-17RA/RE-dependent manner. This loop is further amplified by IL-17C-TCF4 autocrine regulation of ZC3H12A and IL-17C regulation of NFKBIZ to promote self-sustaining skin inflammation.

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