The T cell CD6 receptor operates a multitask signalosome with opposite functions in T cell activation.

The Journal of experimental medicine 2021 Feb 01

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To determine the respective contribution of the LAT transmembrane adaptor and CD5 and CD6 transmembrane receptors to early TCR signal propagation, diversification, and termination, we describe a CRISPR/Cas9-based platform that uses primary mouse T cells and permits establishment of the composition of their LAT, CD5, and CD6 signalosomes in only 4 mo using quantitative mass spectrometry. We confirmed that positive and negative functions can be solely assigned to the LAT and CD5 signalosomes, respectively. In contrast, the TCR-inducible CD6 signalosome comprised both positive (SLP-76, ZAP70, VAV1) and negative (UBASH3A/STS-2) regulators of T cell activation. Moreover, CD6 associated independently of TCR engagement to proteins that support its implication in inflammatory pathologies necessitating T cell transendothelial migration. The multifaceted role of CD6 unveiled here accounts for past difficulties in classifying it as a coinhibitor or costimulator. Congruent with our identification of UBASH3A within the CD6 signalosome and the view that CD6 constitutes a promising target for autoimmune disease treatment, single-nucleotide polymorphisms associated with human autoimmune diseases have been found in the Cd6 and Ubash3a genes. © 2020 Mori et al.

Citation

Daiki Mori, Claude Grégoire, Guillaume Voisinne, Javier Celis-Gutierrez, Rudy Aussel, Laura Girard, Mylène Camus, Marlène Marcellin, Jérémy Argenty, Odile Burlet-Schiltz, Frédéric Fiore, Anne Gonzalez de Peredo, Marie Malissen, Romain Roncagalli, Bernard Malissen. The T cell CD6 receptor operates a multitask signalosome with opposite functions in T cell activation. The Journal of experimental medicine. 2021 Feb 01;218(2)