The role of heat shock proteins in lipopolysaccharide-induced PC12 cell death
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We investigated the role of heat shock proteins (HSPs), particularly HSP60, HSP70 or HSP90 in E. coli lipopolysaccharide (LPS)-induced naïve pheochrommocytoma cell (PC12) death.
PC12 cells seeded at a density of 1x105 cells per poly-L-lysine-coated 3.5 cm diameter polystyrene dish were incubated with LPS (1 mg/ml; serotype O55:B5) for 3, 6, 12, or 24 hr. Cell viability was measured by trypan blue test, and expression of HSP60, HSP70, and HSP90 were detected by Western blot analysis. We found that the viability of PC12 cell decreased significantly after treatment with LPS for 12 hr, and viability was only 30% at 24 hr post-treatment. Western blot analysis revealed that LPS-induced PC12 cell death was associated with an increase in HSP70 or HSP60. HSP70 was markedly up-regulation at 12 hr; and both HSP70 and HSP60 increased significantly by over 1000% and 200%, respectively, 24 hr after administration of LPS. There was no significant change in HSP90 level 3, 6, 12, or 24 hr after LPS treatment. To further investigate the role of HSP70, 60, or HSP90 in LPS-induced PC12 cell death, we treated PC12 cells with hsps antisense oligonucleotide (AODN) for 24 hr. The effects of LPS on cell viability and HSP60, HSP70, or HSP90 expression were again tested. We found that suppression of HSP70 or HSP60 expression accelerated the process of LPS-induced cell death. A reduction in HSP90 level, however, had little effect.
The study revealed that HSP70 and HSP60 played an anti-death role during LPS-induced PC12 cell death, and HSP90 did not appear to be involved.
Advisor:none; none; none; none; none
School:National Sun Yat-Sen University
School Location:China - Taiwan
Source Type:Master's Thesis
Keywords:pc12 cell heat shock proteins lipopolysaccharide
Date of Publication:08/15/2003