Regulation of phosphoenolpyruvate carboxykinase mRNA in mouse liver, kidney, and fat tissues by fasting, diabetes, and insulin.
Previous investigations of the phosphoenolpyruvate carboxykinase (PEPCK) gene have been conducted using rats. In a recent comparative study, we investigated, for the first time, the effects of fasting, refeeding, alloxan-induced diabetes, and insulin treatment on the levels of PEPCK mRNA in mouse liver, kidney, and adipose tissues. As in rats, fasting and diabetes induced, while insulin repressed, hepatic PEPCK mRNA. In contrast, the response of renal PEPCK mRNA to fasting, refeeding, and diabetes in mice differed quantitatively with that in rats: fasting caused a twofold increase in mice and a fourfold increase in rats. Moreover, diabetes, which induces renal PEPCK mRNA indirectly by causing acidosis in rats, was without effect in mice. In adipose tissue, the results of previous studies in both rats and mice have shown that the amount of PEPCK protein and its rate of synthesis are increased by fasting and diabetes and decreased by refeeding and insulin treatment. Thus, it was surprising to find that fasting, refeeding, alloxan-induced diabetes, and insulin treatment had no effect on adipose tissue PEPCK mRNA in either rats or mice.
Nandan
S D
SD
Department of Cell Biology and Anatomy, Texas Tech University Health Sciences Center, Lubbock 79430.
Beale
E G
EG
D000273:Adipose Tissue / Q000201:enzymology; D000818:Animals; D003921:Diabetes Mellitus, Experimental / Q000201:enzymology*; D005215:Fasting / Q000378:metabolism*; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects / Q000502:physiology; D007328:Insulin / Q000494:pharmacology*; D007668:Kidney / Q000201:enzymology; D008099:Liver / Q000201:enzymology; D008297:Male; D051379:Mice; D010729:Phosphoenolpyruvate Carboxykinase (GTP) / Q000235:genetics*; D012333:RNA, Messenger / Q000187:drug effects / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley
D007328:Insulin; D012333:RNA, Messenger; D010729:Phosphoenolpyruvate Carboxykinase (GTP)