Mcl-1 promotes survival of thymocytes by inhibition of Bak in a pathway separate from Bcl-2

A. Dunkle, I. Dzhagalov, Y. W. He*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

The antiapoptotic proteins Mcl-1 and Bcl-2 have been shown to be critical in T-cell development and homeostasis, but the precise mechanism by which these proteins function in T cells and other cells of the body is unclear. Potential mechanisms have allowed both for overlapping and unique roles for these proteins because of their abilities to bind different proapoptotic Bcl-2 family members, but it is unclear which of these mechanisms are important in an in vivo context. By generation of various genetic mouse models, we found that Mcl-1-deficient thymocytes die largely by a Bak-specific mechanism. In vivo deletion of Bak rescued the survival and developmental blocks of Mcl-1-deficient thymocytes at the double-negative and single-positive stages. Transgenic overexpression of Bcl-2 and in vivo deletion of Bax or Bim were unable to rescue Mcl-1-deficient thymocytes. Thus, Mcl-1 functions in a unique pathway from Bcl-2 in T lymphocytes, likely because of its specific ability to bind and sequester proapoptotic Bak. Together, these data provide an in vivo model for Mcl-1 activity and present us with a greater understanding of the pathways that promote thymocyte survival.

Original languageEnglish
Pages (from-to)994-1002
Number of pages9
JournalCell Death and Differentiation
Volume17
Issue number6
DOIs
StatePublished - Jun 2010

Keywords

  • Bak
  • Bcl-2
  • Mcl-1
  • Thymocyte survival

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