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LMP2 immunoproteasome promotes lymphocyte survival by degrading apoptotic BH3-only proteins.

Immunol. Cell Biol.2018 Oct;96(9):981-993. doi:10.1111/imcb.12163. Epub 2018 Jun 03
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摘要


The role of the immunoproteasome is perceived as confined to adaptive immune responses given its ability to produce peptides ideal for MHC Class-I binding. Here, we demonstrate that the immunoproteasome subunit, LMP2, has functions beyond its immunomodulatory role. Using LMP2-deficient mice, we demonstrate that LMP2 is crucial for lymphocyte development and survival in the periphery. Moreover, LMP2-deficient lymphocytes show impaired degradation of key BH3-only proteins, resulting in elevated levels of pro-apoptotic BIM and increased cell death. Interestingly, LMP2 is the sole immunoproteasome subunit required for BIM degradation. Together, our results suggest LMP2 has important housekeeping functions and represents a viable therapeutic target for cancer.

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