ABSTRACT
To ascertain whether heat shock gene expression could protect pulmonaryendothelial cell from hydrogen peroxide(H2O2)一indueed injury,the protective effect of HSPgene expression induced by pretreatment of bovine pulmonary endothelial eells(BPAECs)by heat shock (42 ℃, 2h)against lethal dose(lmmol?L(-1),45min) of H2O2一induced cyt-otoxieity was observed in vitro.It was found that BPAECs heat一shocked prior to exposureto H2O2(Immol?L(-1) 45min)showed significant decrease in H2O2一mediated incrementof LDH rdlease and TBARS production and had an obvious alleviation of H2O2一induccddecreased activities of catalase and superoxide dismutase. Further study showed thatcycloheximide, a protein synthesis inhibitor and Actinomycin D,a mRNA transcriptioninhibitor blocked the expression of HSP 70 and HSP 70 mRNA respectively.Both agentsprevented the cytoprotective effect of heat shock pretreatment against H2O2一mediatedBPAECs injury. The results suggested that HSP70 gene selectively translated after heat shockwas invoived in enhancement of eellular antioxidant mechanism and protected BPAECsagainst H2O2一induced injury