Dexamethasone regulates obese expression in isolated rat adipocytes.
An obese (ob) gene product, expressed specifically in adipose tissues, regulates energy balance. Here we report adipocytes in adipose tissue actually express ob mRNA and that a synthetic glucocorticoid (dexamethasone) regulates expression of the ob gene. Addition of 100 nM dexamethasone to isolated rat adipocytes rapidly induced a 4-8 fold increase in ob mRNA. This increase in ob mRNA level was apparent within 1 h, and reached a maximum at about 7 h after stimulation. The dexamethasone-stimulated increase of ob mRNA was only partially blocked by protein synthesis inhibitors cycloheximide (20 micrograms/ml) or anisomycin (200 microM). This suggests that new protein synthesis is not necessarily required for the observed dexamethasone-stimulated increase in ob mRNA.
Murakami
T
T
Department of Laboratory Medicine, School of Medicine, University of Tokushima, Japan.
Iida
M
M
Shima
K
K
D015056:1-Methyl-3-isobutylxanthine / Q000494:pharmacology; D016475:3T3 Cells; D017667:Adipocytes / Q000187:drug effects / Q000378:metabolism*; D000273:Adipose Tissue / Q000187:drug effects / Q000378:metabolism*; D002001:Adipose Tissue, Brown / Q000187:drug effects / Q000378:metabolism*; D000818:Animals; D000841:Anisomycin / Q000494:pharmacology; D002454:Cell Differentiation; D002478:Cells, Cultured; D003513:Cycloheximide / Q000494:pharmacology; D003907:Dexamethasone / Q000494:pharmacology*; D004822:Epididymis / Q000098:blood supply; D015870:Gene Expression / Q000187:drug effects*; D008297:Male; D051379:Mice; D009131:Muscle, Smooth, Vascular / Q000378:metabolism*; D009765:Obesity / Q000235:genetics*; D011500:Protein Synthesis Inhibitors / Q000494:pharmacology; D012333:RNA, Messenger / Q000032:analysis / Q000096:biosynthesis*; D051381:Rats; D017207:Rats, Sprague-Dawley
D011500:Protein Synthesis Inhibitors; D012333:RNA, Messenger; D000841:Anisomycin; D003907:Dexamethasone; D003513:Cycloheximide; D015056:1-Methyl-3-isobutylxanthine