The combination of selenium and vitamin e inhibits type i collagen formation in cultured hepatic stellate cells

Research output: Contribution to journalArticle

Abstract

This study investigated the effects of sodium selenite (Se) and of vitamin E (d-α-tochopherol) on the deposition of type I collagen by human LX-2 stellate cells. The cultured cells were treated with or without Se or vitamin E and with or without transforming growth factor β1 (TGFβ1). The combination of Se and vitamin E, but not either alone, protected against hepatic fibrosis by decreasing TGFβ1-mediated collagen secretion and accumulation by the stellate cells. This protective effect is due to a combination of decreased formation, decreased stability and increased degradation of the collagen. Effects of Se and vitamin E in decreasing α1(I) collagen mRNA and increasing apoptosis of stellate cells indicate decreased formation of collagen, while decreases in transglutaminase 2, which catalyze cross-linking of collagen, lead to decreased stability of the secreted collagen. Effects of Se and vitamin E on reducing tissue inhibitor metalloproteinase 1 (TIMP-1) are associated with increased degradation. The combination of Se and vitamin E decreased lipid peroxidation, while Se alone increased the activity of the antioxidant enzyme thioredoxin reductase. In conclusion, the combination of Se and vitamin E protected against TGFβ1-mediated hepatic fibrosis by decreasing TGFβ1-mediated type I collagen accumulation by stellate cells. This effect is due to a combination of decreased formation, decreased stability and increased degradation of the collagen.

Original languageEnglish (US)
Pages (from-to)82-94
Number of pages13
JournalBiological Trace Element Research
Volume140
Issue number1
DOIs
StatePublished - Apr 1 2011

Keywords

  • Apoptosis
  • Fibrosis
  • Selenium
  • TGFbeta1
  • Vitamin E

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Biochemistry
  • Clinical Biochemistry
  • Inorganic Chemistry
  • Biochemistry, medical

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