YC-1 induces heat shock protein 70 expression and prevents oxidized LDL-mediated apoptosis in vascular smooth muscle cells

Shock. 2008 Sep;30(3):274-9. doi: 10.1097/shk.0b013e318162c63a.

Abstract

Heat shock protein 70 (hsp70) functioning as molecular chaperon in physiological conditions is induced under stress environment, which affords a defensive mechanism for cells to escape cellular damage. Hence, it is a critical issue to develop a nontoxic hsp70-inducing compound against cellular death. The present study was conducted to evaluate whether 3-(5'-hydroxymethyl-2'-furyl)-1-benzyl-indazol (YC-1) can effectively induce hsp70 expression and protect vascular smooth muscle cells (VSMCs) against oxidized low-density lipoprotein-induced cytotoxicity. We showed that YC-1 enhanced hsp70 expression in VSMCs through a concentration- and time-dependent manner with maximum expression at 18 and 24 h without involving the cyclic guanosine monophosphate and reactive oxygen species signal in the pathway. Furthermore, we did not observe significant cytotoxicity after YC-1 treatment through 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide, lactic dehydrogenase, and fluorescence activating cell sorting scan assays. We demonstrated that the nuclear level of heat shock transcription factor 1 increased at 2 h after YC-1 treatment, and hsp70 expression was directed by the up-regulation of hsp70 mRNA, which peaked at 6 h and was followed by a decline. Hence, translocation of heat shock transcription factor 1 and increased level of hsp70 mRNA would account for Hsp70 expression. Finally, we found that YC-1 protects VSMCs from oxidized low-density lipoprotein-inducing apoptosis. According to our observations, YC-1 would be an effectively pharmacological hsp70 inducer that can be used as a cytoprotective agent in vascular diseases.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Apoptosis*
  • Cell Nucleus / metabolism
  • DNA-Binding Proteins / biosynthesis
  • Enzyme Activators / pharmacology
  • Flow Cytometry
  • Gene Expression Regulation*
  • HSP70 Heat-Shock Proteins / biosynthesis*
  • HSP70 Heat-Shock Proteins / metabolism
  • Heat Shock Transcription Factors
  • Indazoles / pharmacology*
  • Lipoproteins, LDL / metabolism*
  • Male
  • Models, Biological
  • Muscle, Smooth, Vascular / cytology*
  • Muscle, Smooth, Vascular / pathology
  • Rats
  • Rats, Wistar
  • Transcription Factors / biosynthesis

Substances

  • DNA-Binding Proteins
  • Enzyme Activators
  • HSP70 Heat-Shock Proteins
  • Heat Shock Transcription Factors
  • Hsf1 protein, rat
  • Indazoles
  • Lipoproteins, LDL
  • Transcription Factors
  • 3-(5'-hydroxymethyl-2'-furyl)-1-benzylindazole