MHC class II structural requirements for the association with Igalpha/beta, and signaling of calcium mobilization and cell death

Immunology Letters
Lei JinJ C Cambier

Abstract

Emerging evidence indicates that in addition to their well-characterized role in antigen presentation, MHC II molecules transmit signals that induce death of APCs. Appropriately timed APC death is important for prevention of autoimmunity. Though the exact mechanism of MHC II-mediated cell death signaling is unknown, the response appears independent of caspase activation and does not involve Fas-FasL interaction. Here we investigated MHC II structural requirements for mediation of cell death signaling in a murine B cell lymphoma. We found that neither the transmembrane spanning regions nor the cytoplasmic tails of MHC II, which are required for MHC II-mediated cAMP production and PKC activation, are required for the death response. However, mutations in the connecting peptide region of MHC II alpha chain (alphaCP), but not the beta chain (betaCP), resulted in significant impairment of the death response. The alphaCP mutant was also unable to mediate calcium mobilization responses, and did not associate with Igalpha/beta. Knock-down of Igbeta by shRNA eliminated the MHC II-mediated calcium response but not cell death. We propose that MHC II mediates cell death signaling via association with an undefined cell surface protein(s), w...Continue Reading

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Citations

Dec 21, 2010·PloS One·Lei JinJohn C Cambier
Mar 1, 2013·Proceedings of the National Academy of Sciences of the United States of America·Amy S McKeePhilippa Marrack
Jun 23, 2009·European Journal of Immunology·Romney S HaylettLothar Rink
May 12, 2005·Current Opinion in Immunology·Lars Nitschke
Sep 25, 2015·The Journal of Biological Chemistry·Margarida BarrosoJames R Drake
Jun 19, 2013·The Journal of Immunology : Official Journal of the American Association of Immunologists·Benchang Guo, Thomas L Rothstein
Jun 19, 2015·Immunological Reviews·Jaehak Oh, Jeoung-Sook Shin
Jan 2, 2021·Frontiers in Immunology·Elke M MuntjewerffNatalia H Revelo
Jun 14, 2016·Comparative Biochemistry and Physiology. Part D, Genomics & Proteomics·Zhi-Jian WangYao-Guang Zhang

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