The nuclear receptor coactivators p300/CBP/cointegrator-associated protein (p/CIP) and transcription intermediary factor 2 (TIF2) differentially regulate PKA-stimulated transcriptional activity of steroidogenic factor 1

Molecular Endocrinology
Bente BørudGunnar Mellgren

Abstract

Steroidogenic factor-1 (SF-1) is a member of the nuclear receptor superfamily that plays essential roles in the development of endocrine organs. Steroid receptor coactivator 1 and transcription intermediary factor 2 (TIF2) belong to the p160 coactivator family that mediates transcriptional activation by several nuclear receptors, including SF-1. Here, it is reported that another of the p160 coactivators, p/CIP, interacts with SF-1 through the activation function-2 domain. Both p300/CBP/cointegrator-associated protein (p/CIP) and TIF2 potentiated SF-1-mediated transcription from two reporter gene constructs in transfected nonsteroidogenic COS-1 cells and in adrenocortical Y1 cells. PKA was shown to stimulate SF-1 transcriptional activity, and coexpression of p/CIP together with the PKA catalytic subunit stimulated SF-1-mediated transactivation even further. In contrast, PKA catalytic subunit overexpression impaired the ability of TIF2 to potentiate SF-1-dependent transcription. Activation of PKA also inhibited the TIF2-mediated coactivation of other nuclear receptors such as PPAR alpha/-gamma and liver X receptor-alpha. The TIF2 mRNA levels were not affected by PKA, but instead we found that PKA activation led to a decrease in t...Continue Reading

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Citations

Aug 25, 2009·Nature Reviews. Cancer·Jianming XuBert W O'Malley
Aug 10, 2006·Proceedings of the National Academy of Sciences of the United States of America·Tehnaz N ParakhJohn H Nilson
Nov 19, 2008·Molecular and Cellular Biology·Wei-Hsiung YangGary D Hammer
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