text: Effect of pitavastatin on apolipoprotein A-I production in HepG2 cell.
  There are few reports describing the mechanism of HDL-elevating action of HMG-CoA reductase inhibitors (statins). As it is considered that the key step of HDL production is the secretion of apolipoprotein A-I (apoA-I), we investigated the effect of statins on apoA-I synthesis and secretion by HepG2 cell to elucidate the mechanism of the action. Each statin induced apoA-I expression (mRNA and protein) dose-dependently: the rank order of the apoA-I induction pitavastatin (3 microM)>simvastatin (10 microM)>atorvastatin (30 microM). The induction of apoA-I by statins disappeared with addition of mevalonate, which indicates that the effect is HMG-CoA reductase inhibition-dependent. Based on HMG-CoA reductase inhibition, pitavastatin-induced apoA-I more efficiently than simvastatin and atorvastatin. Further study revealed that pitavastatin increased ABCA1 mRNA in HMG-CoA reductase-dependent manner and that Rho and Rho kinase inhibitor (C3T and Y27632) increased apoA-I production in the HepG2 cells. These results suggest that pitavastatin efficiently increases apoA-I in the culture medium of HepG2 cells by promoting apoA-I production through inhibition of HMG-CoA reductase and suppression of Rho activity and by protecting apoA-I from catabolism through ABCA1 induction and lipidation of apoA-I.
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entities.type: CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL GENE-Y GENE-Y GENE-Y CHEMICAL GENE-N GENE-Y GENE-Y GENE-Y GENE-N GENE-Y GENE-Y GENE-Y GENE-Y GENE-Y CHEMICAL GENE-N GENE-Y GENE-Y GENE-Y GENE-Y GENE-Y GENE-Y GENE-Y GENE-N GENE-N CHEMICAL GENE-Y GENE-Y CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL
entities.text: HMG-CoA simvastatin atorvastatin pitavastatin HMG-CoA Y27632 pitavastatin apoA-I apoA-I HMG-CoA reductase pitavastatin Rho apoA-I ABCA1 apoA-I HDL apolipoprotein A-I apoA-I apoA-I apoA-I apoA-I HMG-CoA HDL apoA-I HMG-CoA reductase HMG-CoA reductase apoA-I HMG-CoA reductase ABCA1 HMG-CoA reductase Rho Rho kinase pitavastatin apoA-I apolipoprotein A-I simvastatin atorvastatin mevalonate HMG-CoA HMG-CoA pitavastatin