Regulation of HSP60 mRNA expression in a human ovarian carcinoma cell line.

Abstract

The expression of the 60-kDa heat-shock protein (HSP60) varies markedly among patients with ovarian carcinoma, and high-level expression predicts poor survival in such patients treated with cisplatin (DDP)-containing chemotherapy programs. We investigated the expression of HSP60 in human ovarian carcinoma 2008 cells and an 11-fold DDP-resistant subline 2008/C13*5.25. Heating for 2 h at 44 degrees C produced a 2.7 +/- 0.16-fold increase (mean +/- SD) that was maximal at 4 h after the start of heat exposure. Exposure to an IC50 concentration of DDP for 1 h induced a 1.8 +/- 0.03-fold increase in hsp60 expression. The opposite was true for cadmium and zinc, both of which induced increases in metallothionein IIA but not in the hsp60 message. 2008/C13*5.25 cells constitutively over-expressed hsp60 mRNA by 1.7 +/- 0.16 orders of magnitude and contained a 3.8 +/- 0.45-fold higher level of HSP60 as detected by immunocytochemical staining. 2008/C13*5.25 cells showed 1.2-fold cross-resistance to thermal killing. Expression of hsp60 was markedly reduced in 2008 xenografts as compared with 2008 cells growing in vitro; however, neither serum starvation nor refeeding altered the message level. Exposure to a variety of growth factors and drug treatments known to alter the DDP sensitivity of 2008 cells, including epidermal growth factor, 12-O-tetradecanoylphorbol-13-acetate, buthionine sulfoximine, ouabain, and forskolin, did not alter hsp60 expression. These results suggest a role for HSP60 in mediating resistance to both DDP and hyperthermia but indicate that the hsp60 mRNA levels are not regulated by the factors listed above.

• Authors: E Kimura, R E Enns, F Thiebaut, S B Howell
• Journal: Cancer chemotherapy and pharmacology (Cancer Chemother Pharmacol) Vol. 32 Issue 4 Pg. 279-85 ( 1993) ISSN: 0344-5704 [Print] Germany
• PMID: 8100743 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Chaperonin 60
• Growth Substances
• Heat-Shock Proteins
• RNA, Messenger
• RNA, Neoplasm
• Cadmium
• Metallothionein
• Zinc
• Cisplatin

Topics

• Blotting, Northern
• Cadmium (pharmacology)
• Chaperonin 60
• Cisplatin (pharmacology)
• Drug Resistance
• Female
• Flow Cytometry
• Gene Expression Regulation, Neoplastic (drug effects)
• Growth Substances (pharmacology)
• Heat-Shock Proteins (biosynthesis, genetics)
• Hot Temperature
• Humans
• Metallothionein (metabolism)
• Neoplasm Transplantation
• Ovarian Neoplasms (genetics, metabolism, pathology)
• RNA, Messenger (biosynthesis, genetics)
• RNA, Neoplasm (biosynthesis, genetics)
• Tumor Cells, Cultured
• Zinc (pharmacology)