Antagonism between MCL-1 and PUMA governs stem/progenitor cell survival during hematopoietic recovery from stress.
Alex R D DelbridgeJoseph T OpfermanStephanie GrabowAndreas StrasserPublished in: Blood (2015)
Understanding the critical factors that govern recovery of the hematopoietic system from stress, such as during anticancer therapy and bone marrow transplantation, is of clinical significance. We investigated the importance of the prosurvival proteins myeloid cell leukemia-1 (MCL-1) and B-cell lymphoma-extra large (BCL-XL) in stem/progenitor cell survival and fitness during hematopoietic recovery from stress. Loss of a single Mcl-1 allele, which reduced MCL-1 protein levels, severely compromised hematopoietic recovery from myeloablative challenge and following bone marrow transplantation, whereas BCL-XL was dispensable in both contexts. We identified inhibition of proapoptotic p53 upregulated modulator of apoptosis (PUMA) as the key role of MCL-1 in both settings, with Mcl-1(+/-);Puma(-/-) mice completely protected from the deleterious effects of loss of 1 Mcl-1 allele. These results reveal the molecular mechanisms that govern cell survival during hematopoietic recovery from stress.
Keyphrases
- bone marrow
- mesenchymal stem cells
- stress induced
- single cell
- body composition
- acute myeloid leukemia
- gene expression
- oxidative stress
- type diabetes
- physical activity
- diffuse large b cell lymphoma
- heat stress
- dna methylation
- cell proliferation
- stem cells
- endoplasmic reticulum stress
- low dose
- allogeneic hematopoietic stem cell transplantation
- insulin resistance
- high dose
- cell cycle arrest
- amino acid
- pi k akt
- smoking cessation
- high fat diet induced