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Publication : Inhibition of the single downstream target BAG1 activates the latent apoptotic potential of MYC.

First Author  Zhang XY Year  2011
Journal  Mol Cell Biol Volume  31
Issue  24 Pages  5037-45
PubMed ID  21986497 Mgi Jnum  J:178314
Mgi Id  MGI:5298137 Doi  10.1128/MCB.06297-11
Citation  Zhang XY, et al. (2011) Inhibition of the Single Downstream Target BAG1 Activates the Latent Apoptotic Potential of MYC. Mol Cell Biol 31(24):5037-45
abstractText  Aberrant MYC expression is a common oncogenic event in human cancer. Paradoxically, MYC can either drive cell cycle progression or induce apoptosis. The latent ability of MYC to induce apoptosis has been termed "intrinsic tumor suppressor activity," and reactivating this apoptotic function in tumors is widely considered a valuable therapeutic goal. As a transcription factor, MYC controls the expression of many downstream targets, and for the majority of these, it remains unclear whether or not they play direct roles in MYC function. To identify the subset of genes specifically required for biological activity, we conducted a screen for functionally important MYC targets and identified BAG1, which encodes a prosurvival chaperone protein. Expression of BAG1 is regulated by MYC in both a mouse model of breast cancer and transformed human cells. Remarkably, BAG1 induction is essential for protecting cells from MYC-induced apoptosis. Ultimately, the synthetic lethality we have identified between MYC overexpression and BAG1 inhibition establishes a new pathway that might be exploited to reactivate the latent apoptotic potential of MYC as a cancer therapy.
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