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Macroautophagy in lymphatic endothelial cells inhibits T cell-mediated autoimmunity

Contributors

Harle, Guillaume; Kowalski, Camille; Dubrot Armendariz, Juan; Brighouse, Dale; Clavel, Gaëlle; Pick, Robert; Bessis, Natacha; Niven, Jennifer; Scheiermann, Christoph; Gannagé, Monique; Hugues, Stéphanie

Published in

Journal of Experimental Medicine, vol. 218, no. 6

Publication date

2021

Abstract

Lymphatic endothelial cells (LECs) present peripheral tissue antigens to induce T cell tolerance. In addition, LECs are the main source of sphingosine-1-phosphate (S1P), promoting naive T cell survival and effector T cell exit from lymph nodes (LNs). Autophagy is a physiological process essential for cellular homeostasis. We investigated whether autophagy in LECs modulates T cell activation in experimental arthritis. Whereas genetic abrogation of autophagy in LECs does not alter immune homeostasis, it induces alterations of the regulatory T cell (T reg cell) population in LNs from arthritic mice, which might be linked to MHCII-mediated antigen presentation by LECs. Furthermore, inflammation-induced autophagy in LECs promotes the degradation of Sphingosine kinase 1 (SphK1), resulting in decreased S1P production. Consequently, in arthritic mice lacking autophagy in LECs, pathogenic Th17 cell migration toward LEC-derived S1P gradients and egress from LNs are enhanced, as well as infiltration of inflamed joints, resulting in exacerbated arthritis. Our results highlight the autophagy pathway as an important regulator of LEC immunomodulatory functions in inflammatory conditions.

UNIGE affiliation entities

UNIGE research groups

Funding

Citation (ISO format)

HARLE, Guillaume et al. Macroautophagy in lymphatic endothelial cells inhibits T cell-mediated autoimmunity. In: Journal of Experimental Medicine, 2021, vol. 218, n° 6. doi: 10.1084/jem.20201776

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Article (Published version)
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Journal ISSN

0022-1007
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Technical informations

Creation

16/06/2021 15:41:00

First validation

16/06/2021 15:41:00

Update

15/09/2023 15:48:21

Status update

15/09/2023 15:48:21

Last indexation

31/10/2024 22:24:41
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