Obligate Role of Anti-Apoptotic MCL-1 in the Survival of Hematopoietic Stem Cells

作者：Joseph T. Opferman, Hiromi Iwasaki, Christy C. Ong, Heikyung Suh, Shin-ichi Mizuno, Koichi Akashi, Stanley J. Korsmeyer · 发表于：Science · 年份：2005 · DOI：10.1126/science.1106114 · 被引用次数：576 · 研究领域：Hematopoietic Stem Cell Transplantation、Acute Myeloid Leukemia Research、Immune cells in cancer

Apoptosis is important in controlling hematopoietic stem cell (HSC) numbers. However, the specific BCL-2 family member(s) that regulate HSC homeostasis are not precisely defined. We tested myeloid leukemia-1 (MCL-1) as an attractive candidate that is highly expressed in HSCs and regulated by growth factor signals. Inducible deletion of Mcl-1 in mice resulted in ablation of bone marrow. This resulted in the loss of early bone marrow progenitor populations, including HSCs. Moreover, growth factors including stem cell factor increased transcription of the Mcl-1 gene and required MCL-1 to augment survival of purified bone marrow progenitors. Deletion of Mcl-1 in other tissues, including liver, did not impair survival. Thus, MCL-1 is a critical and specific regulator essential for ensuring the homeostasis of early hematopoietic progenitors.