Epithelial HVEM promotes basement membrane synthesis and intraepithelial T cell survival and migration [article]

Daisuke Takahashi, Qingyang Wang, Goo-Young Seo, Jr-Wen Shui, Zbigniew Mikulski, Paola Marcovecchio, Masumi Takahashi, Charles D. Surh, Hilde Cheroutre, Mitchell Kronenberg
2020 bioRxiv   pre-print
Intraepithelial T cells (IET) provide continuous surveillance of the intestinal epithelium, but little was known about how epithelial-derived signals regulate the IET population. We show that epithelial expression of the herpes virus entry mediator (HVEM), a member of the TNF receptor superfamily (TNFRSF), maintained the survival of small intestine IET, especially innate-like TCRαβ+ cells lacking CD4 and CD8β. Patrolling movement of all CD8α+ IET also was impaired in the absence of HVEM.
more » ... nce of HVEM. HVEM-deficient epithelial cells exhibited downregulation of synthesis of basement membrane components, including collagen IV. Collagen IV supported IET survival in vitro via interactions with β1 integrins expressed by the IET; absence of β1 integrins decreased some IET subsets. Therefore, these data define a circuit whereby epithelial cells regulate intestine resident T lymphocyte populations through basement membrane synthesis.
doi:10.1101/2020.09.30.317628 fatcat:dixaqan3wzeplntygjhjjrurm4