Expression of calcium-binding protein regucalcin mRNA in the cloned human hepatoma cells (HepG2): stimulation by insulin.
The expression of hepatic Ca(2+)-binding protein regucalcin in the cloned human hepatoma cells (HepG2) was investigated. The change in regucalcin mRNA levels was analyzed by Northern blotting using rat liver regucalcin complementary DNA (0.9 kb of open reading frame). Regucalcin mRNA was expressed in HepG2 cells, although the mRNA was markedly expressed in normal rat liver. Moreover, regucalcin protein in HepG2 cells was detected by Western blot analysis using a polyclonal rabbit anti-regucalcin antibody. Regucalcin mRNA expression in HepG2 cells was clearly stimulated by the culture with insulin (10(-8) M) of the effective concentration. Regucalcin protein in HepG2 cells was also increased by the treatment of insulin (10(-8) M). The present results demonstrate that regucalcin is expressed in the transformed HepG2 cells, and that the expression is stimulated by insulin.
Murata
T
T
Laboratory of Endocrinology and Molecular Metabolism, Graduate School of Nutritional Sciences, University of Shizuoka, Japan.
Shinya
N
N
Yamaguchi
M
M
D000818:Animals; D015152:Blotting, Northern; D015153:Blotting, Western; D002135:Calcium-Binding Proteins / Q000187:drug effects / Q000378:metabolism*; D002265:Carboxylic Ester Hydrolases; D006528:Carcinoma, Hepatocellular / Q000378:metabolism*; D003001:Cloning, Molecular; D018076:DNA, Complementary; D006801:Humans; D007124:Immunoenzyme Techniques; D007328:Insulin / Q000494:pharmacology*; D047908:Intracellular Signaling Peptides and Proteins; D008099:Liver / Q000378:metabolism; D008113:Liver Neoplasms / Q000378:metabolism*; D008297:Male; D012333:RNA, Messenger / Q000187:drug effects / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar; D015238:Sulfotransferases; D014407:Tumor Cells, Cultured
D002135:Calcium-Binding Proteins; D018076:DNA, Complementary; D007328:Insulin; D047908:Intracellular Signaling Peptides and Proteins; C513323:RGN protein, human; D012333:RNA, Messenger; D015238:Sulfotransferases; C028152:alcohol sulfotransferase; D002265:Carboxylic Ester Hydrolases; C513325:Rgn protein, rat