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

Damien Zanker, Kenneth Pang, Sara Oveissi, Chunni Lu, Pierre Faou, Cameron Nowell, George W. Mbogo, Sebastian Carotta, Cathy Quillici, Guna Karupiah, Margaret L. Hibbs, Stephen L. Nutt, Paul Neeson, Hamsa Puthalakath, Weisan Chen

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)981-993
Number of pages13
JournalImmunology and Cell Biology
Volume96
Issue number9
DOIs
Publication statusPublished - 1 Oct 2018

Keywords

  • BIM
  • immunoproteasome
  • LMP2
  • lymphocyte differentiation
  • NFκB
  • survival
  • T-cell development

Cite this

Zanker, D., Pang, K., Oveissi, S., Lu, C., Faou, P., Nowell, C., Mbogo, G. W., Carotta, S., Quillici, C., Karupiah, G., Hibbs, M. L., Nutt, S. L., Neeson, P., Puthalakath, H., & Chen, W. (2018). LMP2 immunoproteasome promotes lymphocyte survival by degrading apoptotic BH3-only proteins. Immunology and Cell Biology, 96(9), 981-993. https://doi.org/10.1111/imcb.12163