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Titolo:
Overexpression of inducible heat shock protein 70 in COS-1 cells fails to protect from cytotoxicity of oxidized LDLs
Autore:
Pirillo, A; Norata, GD; Zanelli, T; Catapano, AL;
Indirizzi:
Univ Milan, Inst Pharmacol Sci, I-20133 Milan, Italy Univ Milan Milan Italy I-20133 Inst Pharmacol Sci, I-20133 Milan, Italy Osped Bassini, Ctr Studio Prevenz & Terapia Vasculopatie Arterio, Milan, Italy Osped Bassini Milan Italy & Terapia Vasculopatie Arterio, Milan, Italy
Titolo Testata:
ARTERIOSCLEROSIS THROMBOSIS AND VASCULAR BIOLOGY
fascicolo: 3, volume: 21, anno: 2001,
pagine: 348 - 354
SICI:
1079-5642(200103)21:3<348:OOIHSP>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
SMOOTH-MUSCLE CELLS; LOW-DENSITY-LIPOPROTEIN; HUMAN ENDOTHELIAL-CELLS; JURKAT T-CELLS; STRESS PROTEINS; APAF-1 APOPTOSOME; HSP70 EXPRESSION; MAMMALIAN-CELLS; INJURY; DEATH;
Keywords:
low density lipoproteins; apoptosis; necrosis; Bcl-2; Bax;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
59
Recensione:
Indirizzi per estratti:
Indirizzo: Catapano, AL Univ Milan, Inst Pharmacol Sci, Via Balzaretti 9, I-20133 Milan, Italy Univ Milan Via Balzaretti 9 Milan Italy I-20133 Milan, Italy
Citazione:
A. Pirillo et al., "Overexpression of inducible heat shock protein 70 in COS-1 cells fails to protect from cytotoxicity of oxidized LDLs", ART THROM V, 21(3), 2001, pp. 348-354

Abstract

Oxidized low density lipoproteins (OxLDLs) are believed to play a central role in atherogenesis and to possess a wide variety of biological properties; among them, OxLDLs are cytotoxic to cultured vascular cells in that theyinduce necrosis and apoptosis. Moreover, OxLDLs are known to induce the expression of heat shock protein 70 (Hsp70), a protein that protects cells from several cytotoxic stimuli. To determine whether Hsp70 can protect cells against OxLDL-induced cytotoxicity, COS-1 cells were transfected with a construct containing human Hsp70. A number of cell lines permanently expressing Hsp70 were obtained, 1 of which (cos-Hsp70/10, with high Hsp70 expression) was selected for further studies. Hsp70 overexpression protected cells from toxic stimuli, such as H2O2, UV irradiation, and heat shock, suggesting that the overexpressed protein was functional. When incubated with OxLDLs, however, the clone overexpressing Hsp70 showed a significant decrease in viability, as determined by the [H-3]adenine release assay (319.8+/-3.16% of control for transfected cells versus 217.6+/-6.08% for control cells exposed to 100 mug protein/mL of OxLDL), 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay (12.5+/-0.9% versus 28.9+/-1.99% of control, respectively), and LDH release (48.4+/-0.04% versus 15.2+/-0.06% of control cells). The increased expression of Bax and the decreased expression of Bcl-2(a proapoptotic and an antiapoptotic protein, respectively) in cos-Hsp70/10 cells and in control cells on incubation with OxLDLs suggested that overexpression of Hsp70 did not confer protection against apoptosis induced by OxLDLs. The analysis of nucleosome content and the nuclear staining with Hoechst 33258 confirmed this finding. These data suggest that overexpression of Hsp70 not only fails to protect COS-1 cells against OxLDL-induced apoptosis but rather confers a higher sensitivity to the cytotoxic action of theselipoproteins. Thus, the Hsp70 response, although induced by OxLDLs, cannotprotect cells from lipoprotein toxicity.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/04/20 alle ore 01:47:20