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Loss of BH3-only protein Bim inhibits apoptosis of hemopoietic cells in the fetal liver and male germ cells but not neuronal cells in bcl-x-deficient mice. | LitMetric

AI Article Synopsis

Article Abstract

Members of the Bcl-2 family include pro- and antiapoptotic proteins that regulate programmed cell death of developing tissues and death in response to cellular damage. In developing mice, the antiapoptotic Bcl-x(L) is necessary for survival of neural and hematopoietic cells, and consequently, bcl-x-deficient mice die around Day 13.5 of embryogenesis. Furthermore, adult bcl-x(+/-) heterozygous male mice have reduced fertility because of testicular degeneration. Bax, a multi-BH (Bcl-2 homology) domain proapoptotic member of the Bcl-2 family, is regulated by Bcl-x(L) and is required for the neuropathological abnormalities seen in bcl-x-deficient embryos. The BH3 domain only subgroup of the Bcl-2 family includes proapoptotic members that are essential for the initiation of apoptotic signaling. In this study, we investigated the role for Bim, a BH3 domain only protein, in the embryonic lethality and increased developmental cell death in bcl-x-deficient animals and the perturbed testicular function in bcl-x(+/-) adults. Our studies show that bim deficiency attenuates hematopoietic cell death in the fetal liver of bcl-x-deficient animals, indicating that Bim contributes to programmed cell death in this cell population. In addition, we found that testicular degeneration of adult bcl-x(+/-) males was rescued by concomitant Bim deficiency. However, concomitant Bim deficiency had no effect on the embryonic lethality and widespread nervous system abnormalities caused by bcl-x deficiency. Our work identifies Bim as an important regulator of bcl-x deficiency-induced cell death during hematopoiesis and testicular development.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2544614PMC
http://dx.doi.org/10.1369/jhc.2008.951749DOI Listing

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