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  • Title: The phosphatidyl inositol 3 kinase pathway does not suppress activation of the ARF and BIM genes by deregulated E2F1 activity.
    Author: Kurayoshi K, Okuno J, Ozono E, Iwanaga R, Bradford AP, Kugawa K, Araki K, Ohtani K.
    Journal: Biochem Biophys Res Commun; 2017 Jan 22; 482(4):784-790. PubMed ID: 27888102.
    Abstract:
    The transcription factor E2F plays crucial roles in tumor suppression by activating pro-apoptotic genes such as the tumor suppressor ARF. The regulation of the ARF gene is distinct from that of growth-related E2F targets, in that it is specifically activated by deregulated E2F activity, induced by over-expression of E2F or forced inactivation of pRB, but not by physiological E2F activity induced by growth stimulation. The phosphatidyl inositol 3 kinase (PI3K) pathway was reported to suppress expression of some atypical pro-apoptotic genes by over-expressed E2F1. However, the effects of the PI3K pathway on the distinct regulation of typical pro-apoptotic E2F targets have not been elucidated. We examined whether the PI3K pathway suppressed activation of the typical pro-apoptotic E2F targets ARF and BIM. Activation of the PI3K pathway by growth stimulation or introduction of a constitutively active Akt/PKB did not reduce induction of ARF or BIM gene expression or activation of their promoters by over-expressed E2F1. These results suggest that the PI3K pathway does not suppress induction of typical pro-apoptotic genes that are selectively activated by deregulated E2F1.
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