AMBRA1 Controls Regulatory T-Cell Differentiation and Homeostasis Upstream of the FOXO3-FOXP3 Axis

J Becher, L Simula, E Volpe, C Procaccini, C La Rocca, P D'Acunzo, V Cianfanelli, F Strappazzon, I Caruana, F Nazio, G Weber, V Gigantino, G Botti, F Ciccosanti, G Borsellino, S Campello, G Mandolesi, M De Bardi, GM Fimia, M D'AmelioF Ruffini, R Furlan, D Centonze, G Martino, P Braghetta, M Chrisam, P Bonaldo, G Matarese, F Locatelli, L Battistini, F Cecconi

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Abstract

Regulatory T cells (Treg) are necessary to maintain immunological tolerance and are key players in the control of autoimmune disease susceptibility. Expression of the transcription factor FOXP3 is essential for differentiation of Treg cells and indispensable for their suppressive function. However, there is still a lack of knowledge about the mechanisms underlying its regulation. Here, we demonstrate that pro-autophagy protein AMBRA1 is also a key modulator of T cells, regulating the complex network that leads to human Treg differentiation and maintenance. Indeed, through its ability to interact with the phosphatase PP2A, AMBRA1 promotes the stability of the transcriptional activator FOXO3, which, in turn, triggers FOXP3 transcription. Furthermore, we found that AMBRA1 plays a significant role in vivo by regulating Treg cell induction in mouse models of both tumor growth and multiple sclerosis, thus highlighting the role of AMBRA1 in the control of immune homeostasis. Regulatory T cells (Treg) maintain immunological tolerance and help control autoimmune disease susceptibility. Becher et al. show pro-autophagy factor AMBRA1 regulates human and mouse Treg differentiation and maintenance. AMBRA1 is upregulated in stimulated T cells to stabilize FOXO3 and has a protective effect in a mouse model of multiple sclerosis. © 2018 Elsevier Inc.
Original languageEnglish
Pages (from-to)592-607.e6
JournalDevelopmental Cell
Volume47
Issue number5
DOIs
Publication statusPublished - 2018

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Becher, J., Simula, L., Volpe, E., Procaccini, C., La Rocca, C., D'Acunzo, P., Cianfanelli, V., Strappazzon, F., Caruana, I., Nazio, F., Weber, G., Gigantino, V., Botti, G., Ciccosanti, F., Borsellino, G., Campello, S., Mandolesi, G., De Bardi, M., Fimia, GM., ... Cecconi, F. (2018). AMBRA1 Controls Regulatory T-Cell Differentiation and Homeostasis Upstream of the FOXO3-FOXP3 Axis. Developmental Cell, 47(5), 592-607.e6. https://doi.org/10.1016/j.devcel.2018.11.010