Class a type II scavenger receptor mediates silica-induced apoptosis in Chinese hamster ovary cell line

Raymond F. Hamilton, Willem J.S. De Villiers, Andrij Holian

Research output: Contribution to journalArticlepeer-review

Abstract

Macrophage scavenger receptors are known to bind endotoxins, oxidized low-density lipoproteins (Ox-LDL), and other proteins with clustered negative charges. Recent evidence indicates some particulates may also bind to the scavenger receptor and initiate apoptosis. In this study, chinese hamster ovary (CHO) cells stabily transfected with the murine class A type II scavenger receptor (SR-A II) were exposed to crystalline silica to examine the role of this receptor in apoptosis. In a 24-h culture, silica (250 μg/ml) induced significant cell injury (necrosis and apoptosis) in transfected cells (MSR II) but not in the control cells (KA-7). This effect was specific to silica, as a control particle titanium dioxide had no cytotoxic effects on the MSR II cells at equal particle mass concentrations. Furthermore, silica-induced apoptosis in the MSR II cells could be eliminated by preincubating the cells with SR-A II antagonists: polyinosinic acid or maleylated bovine serum albumin. This study further supports the hypothesis that the SR-A II is directly involved with silica toxicity and that certain scavenger receptor ligands may have an important role in regulating macrophage apoptosis. (C) 2000 Academic Press.

Original languageEnglish
Pages (from-to)100-106
Number of pages7
JournalToxicology and Applied Pharmacology
Volume162
Issue number2
DOIs
StatePublished - Jan 15 2000

Keywords

  • Cytotoxicity
  • Inflammation
  • MSR II
  • Necrosis
  • Titanium dioxide

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