Journal article

Muscle-specific androgen receptor deletion shows limited actions in myoblasts but not in myofibers in different muscles in vivo

Kesha Rana, Maria WS Chiu, Patricia K Russell, Jarrod P Skinner, Nicole KL Lee, Barbara C Fam, Jeffrey D Zajac, Helen E MacLean

JOURNAL OF MOLECULAR ENDOCRINOLOGY | BIOSCIENTIFICA LTD | Published : 2016

Abstract

The aim of this study was to investigate the direct muscle cell-mediated actions of androgens by comparing two different mouse lines. The cre-loxP system was used to delete the DNA-binding activity of the androgen receptor (AR) in mature myofibers (MCK mAR(ΔZF2)) in one model and the DNA-binding activity of the AR in both proliferating myoblasts and myofibers (α-actin mAR(ΔZF2)) in another model. We found that hind-limb muscle mass was normal in MCK mAR(ΔZF2) mice and that relative mass of only some hind-limb muscles was reduced in α-actin mAR(ΔZF2) mice. This suggests that myoblasts and myofibers are not the major cellular targets mediating the anabolic actions of androgens on male muscle d..

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