Apoptotic injury in cultured human hepatocytes induced by HMG-CoA reductase inhibitors

Toshio Kubota, Koji Fujisaki, Yoshinori Itoh, Takahisa Yano, Toshiaki Sendo, Ryozo Oishi

Research output: Contribution to journalArticle

77 Citations (Scopus)

Abstract

Hepatotoxicity is the major complaint during therapy with lipid-lowering agents such as statins, although the cellular mechanisms underlying the statin-induced liver injury are not fully understood. Using cultured human hepatocytes, we investigated the effects of lipophilic as well as hydrophilic statins on the cell viability. Lipophilic statins, including simvastatin, lovastatin, cerivastatin, fluvastatin and atorvastatin, reduced the viability of hepatocytes as assessed by the mitochondrial enzyme activity to reduce WST-8, however, a hydrophilic pravastatin did not cause cell injury. The simvastatin-induced loss of cell viability was attenuated by mevalonate or geranylgeranyl pyrophosphate. Simvastatin-induced DNA fragmentation and increased the number of cells stained with annexin V and terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling, both of which were reversed by caspase inhibitors such as zDEVD-fmk, zLEHD-fmk and zIETD-fmk. Consistent with these data, the activities of caspase-3, caspase-9 and caspase-8 were elevated by simvastatin. Simvastatin reduced the protein content and mRNA expression for bcl-2 without affecting bax mRNA expression. On the other hand, both lipophilic and hydrophilic statins significantly reduced the content of endogenous cholesterol. These findings suggest that lipophilic statins cause an apoptotic injury in human hepatocytes by stimulating caspase-3 subsequent to the activation of caspase-9 and caspase-8, in which the inhibition of 3-hydroxy-3-methylglutaryl coenzyme A reductase may be involved.

Original languageEnglish
Pages (from-to)2175-2186
Number of pages12
JournalBiochemical Pharmacology
Volume67
Issue number12
DOIs
Publication statusPublished - Jun 15 2004
Externally publishedYes

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Keywords

  • 2-(2-methoxy-4-nitorophenyl)-3-(4- nitorophenyl)-5-(2,4-disulfophenyl)-2H-tetrazolium monosodium salt
  • 3-hydroxy-3-methyglutaryl coenzyme A
  • GGPP
  • HMG-CoA
  • MVA
  • TUNEL
  • WST-8
  • geranylgeranyl pyrophosphate
  • mevalonate

ASJC Scopus subject areas

  • Biochemistry
  • Pharmacology

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