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BH3-only proteins that bind pro-survival Bcl-2 family members fail to induce apoptosis in the absence of Bax and Bak

Open access
Zong, Wei-Xing, Lindsten, Tullia, Ross, Andrea J., MacGregor, Grant R., Thompson, Craig B.·2001·Genes & Development

Abstract

The BH3-only proteins Bim and Bad bind to the antiapoptotic Bcl-2 proteins and induce apoptosis in wild-type cells and cells from either bax−/− or bak−/− animals. In contrast, constitutively active forms of Bim and Bad failed to induce apoptosis in bax−/−bak−/− cells. Expression of Bax restored susceptibility of the cells to Bim and Bad. In addition, Bax but not Bim or Bad sensitized the bax−/−bak−/− cells to a wide variety of cell death stimuli including UV irradiation, chemotherapeutic agents, and ER stress. These results suggest that neither activation of BH3-only proteins nor suppression of pro-survival Bcl-2 proteins is sufficient to kill cells in the absence of both Bax and Bak. Furthermore, whereas mouse embryo fibroblasts (MEF) expressing only Bax or Bak displayed resistance to transformation,bax−/−bak−/− MEF were nearly as prone to oncogenic transformation as p53−/− MEF. Thus, the function of either Bax or Bak appears required to initiate most forms of apoptosis and to suppress oncogenic transformation.

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Metadata

Authors
Zong, W.-X., Lindsten, T., Ross, A. J., MacGregor, G. R., & Thompson, C. B.
Venue
Genes & Development
Published
2001-06-15
Volume
15
Issue
12
Pages
1481-1486
ISSN
  • 0890-9369 (ISSN-L)
  • 1549-5477
OpenAlex
W2166601968
Cited by
808
References
2
Type
posted content
Language
en
Open access
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