p120 acts as a specific coactivator for 9-cis-retinoic acid receptor (RXR) on peroxisome proliferator-activated receptor-gamma/RXR heterodimers. Academic Article uri icon

Overview

abstract

  • p120 was originally isolated as a novel nuclear co-activator for thyroid hormone receptor. In this study, we characterized its interaction and transactivation of peroxisome proliferator-activated receptor-gamma (PPARgamma) and 9-cis-retinoic acid receptor (RXR) heterodimers. Transient transfection study revealed that p120 enhanced the transcriptional activation of PPARgamma/RXR induced by PPARgamma- or RXR-specific ligands. In the glutathione-S-transferase pull-down assay, while steroid receptor coactivator-1 showed apparent interactions with both RXR and PPARgamma, p120 bound only to RXR in a 9-cis-retinoic acid (RA)-dependent manner and also did not bind to PPARgamma even in the presence of thiazolidinediones. The yeast two-hybrid analysis showed no interaction of p120 with PPARgamma under any conditions, and electophoretic mobility shift assay showed apparent DNA-PPARgamma/RXR/p120 complex formation only in the presence of 9-cis-RA. Furthermore, the yeast three-hybrid assay clearly revealed a significant interaction between p120 and PPARgamma via RXR of PPARgamma/RXR heterodimer only in the presence of 9-cis-RA. These findings indicate that p120 acts as a specific co-activator for the RXR of PPARgamma/RXR heterodimer in a 9-cis-RA-dependent manner.

publication date

  • October 1, 1999

Research

keywords

  • Carrier Proteins
  • Receptors, Cytoplasmic and Nuclear
  • Receptors, Retinoic Acid
  • Receptors, Thyroid Hormone
  • Transcription Factors

Identity

Scopus Document Identifier

  • 0033305351

Digital Object Identifier (DOI)

  • 10.1210/mend.13.10.0353

PubMed ID

  • 10517671

Additional Document Info

volume

  • 13

issue

  • 10