Use of artificial androgen receptor coactivators to alter myoblast proliferation

Cara L. Benjamin, Guido Jenster, Jorge A. Piedrahita

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Skeletal muscle has long been thought to be a target tissue for androgens, eliciting their effect through the androgen receptor. In order to better understand androgen receptor action, a series of mutated androgen receptors were developed and their degree of specificity and cellular responses determined. Specificity, as measured by a reporter assay using HeLa cells, indicated that mutation of the ligand-binding domain or the AR (mutation H865Y), in combination with the p65 transactivating domain, resulted in an increased response to androgens as well as decreased specificity. Transfection of the mutant AR into mouse and rat myoblast cell lines resulted in an increase in expression of the reporter gene consistent with the data from HeLa cells. Overexpression of the wild type or mutant AR into myoblasts and treatment with testosterone induced both greater proliferation and faster differentiation of the cells compared to those expressing endogenous AR. Additionally, when treated with estrogen, these cells were able to proliferate and differentiate to similar levels as cells treated with testosterone. The ability of the mutated AR to act as an artificial coactivator to up-regulate androgen responsive genes is a useful tool for understanding the interaction of androgens and muscle growth.

Original languageEnglish (US)
Pages (from-to)111-119
Number of pages9
JournalJournal of Steroid Biochemistry and Molecular Biology
Issue number3
StatePublished - Jul 1 2004
Externally publishedYes


  • Androgen receptor
  • Coactivators
  • Muscle growth

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology


Dive into the research topics of 'Use of artificial androgen receptor coactivators to alter myoblast proliferation'. Together they form a unique fingerprint.

Cite this