MCL-1-dependent Leukemia Cells Are More Sensitive to Chemotherapy Than BCL-2-dependent Counterparts

Overview

Journal J Cell Biol

Specialty Cell Biology

Date 2009 Dec 2

PMID 19948485

Citations 53

Authors

Joslyn K Brunelle

Jeremy Ryan

Derek Yecies

Joseph T Opferman

Anthony Letai

Affiliations

Soon will be listed here.

Abstract

Myeloid cell leukemia sequence 1 (MCL-1) and B cell leukemia/lymphoma 2 (BCL-2) are anti-apoptotic proteins in the BCL-2 protein family often expressed in cancer. To compare the function of MCL-1 and BCL-2 in maintaining cancer survival, we constructed complementary mouse leukemia models based on Emu-Myc expression in which either BCL-2 or MCL-1 are required for leukemia maintenance. We show that the principal anti-apoptotic mechanism of both BCL-2 and MCL-1 in these leukemias is to sequester pro-death BH3-only proteins rather than BAX and BAK. We find that the MCL-1-dependent leukemias are more sensitive to a wide range of chemotherapeutic agents acting by disparate mechanisms. In common across these varied treatments is that MCL-1 protein levels rapidly decrease in a proteosome-dependent fashion, whereas those of BCL-2 are stable. We demonstrate for the first time that two anti-apoptotic proteins can enable tumorigenesis equally well, but nonetheless differ in their influence on chemosensitivity.

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