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Article: Heat shock protein 65 promotes atherosclerosis through impairing the properties of high density lipoprotein

TitleHeat shock protein 65 promotes atherosclerosis through impairing the properties of high density lipoprotein
Authors
Issue Date2014
Citation
Atherosclerosis, 2014, v. 237 n. 2, p. 853-861 How to Cite?
AbstractAim: To explicit whether the functions of high density lipoprotein (HDL) are impaired in murine atherosclerosis by subcutaneous immunization with recombinant mycobacterial heat shock protein 65 (HSP65). Methods: C57BL/6 mice were fed a normal chow-diet with non immunization as normal group. ApoE knockout (ApoE−/−) mice on high-fat diet were randomly divided into three groups (n = 8) and immunized subcutaneously with different concentrations of HSP65 or phosphate-buffered saline (PBS). All animals were treated for 16 weeks. Reverse cholesterol efflux, the anti-oxidant and anti-inflammatory functions of HDL were assayed. Hepatocytes and peritoneal macrophages were isolated to examine the expression of cholesterol transport regulating proteins, including SR-B1, ABCA1, ABCG1, PPAR-γ and LXR-α. Results: In HSP65-immunized mice, paraoxonase1 (PON1) activity and the expression of IL-10 were reduced, while High-density lipoprotein inflammatory index (HII), myeloperoxidase (MPO) activity, and the expression of IFN-γ were elevated gradually. The MPO/PON1 ratio amount was significantly higher in HSP65-immunized group than in normal or PBS-immunized group. In addition, compared with normal or PBS-immunized group, cholesterol efflux rate and the expression of regulating proteins were markedly decreased in HSP65-immunized group. The mice immunized with HSP65 developed significantly larger aorta atherosclerotic plaques when compared with PBS-treated littermates. The high MPO/PON1 ratio was correlated with HII, cholesterol efflux rate and atherosclerotic plaques. Conclusions: This study demonstrates that subcutaneous immunization with HSP65 impairs the properties of HDL, which may contribute to its important pathogenic role of HSP65 in atherogenesis. Also, MPO/PON1 ratio may be a predictor of AS.
Persistent Identifierhttp://hdl.handle.net/10722/217943

 

DC FieldValueLanguage
dc.contributor.authorSun, H-
dc.contributor.authorShen, J-
dc.contributor.authorLiu, T-
dc.contributor.authorTan, Y-
dc.contributor.authorTian, D-
dc.contributor.authorLai, W-
dc.contributor.authorDai, M-
dc.contributor.authorGuo, Z-
dc.date.accessioned2015-09-18T06:19:12Z-
dc.date.available2015-09-18T06:19:12Z-
dc.date.issued2014-
dc.identifier.citationAtherosclerosis, 2014, v. 237 n. 2, p. 853-861-
dc.identifier.urihttp://hdl.handle.net/10722/217943-
dc.description.abstractAim: To explicit whether the functions of high density lipoprotein (HDL) are impaired in murine atherosclerosis by subcutaneous immunization with recombinant mycobacterial heat shock protein 65 (HSP65). Methods: C57BL/6 mice were fed a normal chow-diet with non immunization as normal group. ApoE knockout (ApoE−/−) mice on high-fat diet were randomly divided into three groups (n = 8) and immunized subcutaneously with different concentrations of HSP65 or phosphate-buffered saline (PBS). All animals were treated for 16 weeks. Reverse cholesterol efflux, the anti-oxidant and anti-inflammatory functions of HDL were assayed. Hepatocytes and peritoneal macrophages were isolated to examine the expression of cholesterol transport regulating proteins, including SR-B1, ABCA1, ABCG1, PPAR-γ and LXR-α. Results: In HSP65-immunized mice, paraoxonase1 (PON1) activity and the expression of IL-10 were reduced, while High-density lipoprotein inflammatory index (HII), myeloperoxidase (MPO) activity, and the expression of IFN-γ were elevated gradually. The MPO/PON1 ratio amount was significantly higher in HSP65-immunized group than in normal or PBS-immunized group. In addition, compared with normal or PBS-immunized group, cholesterol efflux rate and the expression of regulating proteins were markedly decreased in HSP65-immunized group. The mice immunized with HSP65 developed significantly larger aorta atherosclerotic plaques when compared with PBS-treated littermates. The high MPO/PON1 ratio was correlated with HII, cholesterol efflux rate and atherosclerotic plaques. Conclusions: This study demonstrates that subcutaneous immunization with HSP65 impairs the properties of HDL, which may contribute to its important pathogenic role of HSP65 in atherogenesis. Also, MPO/PON1 ratio may be a predictor of AS.-
dc.languageeng-
dc.relation.ispartofAtherosclerosis-
dc.titleHeat shock protein 65 promotes atherosclerosis through impairing the properties of high density lipoprotein-
dc.typeArticle-
dc.identifier.emailShen, J: shenjg@hku.hk-
dc.identifier.authorityShen, J=rp00487-
dc.identifier.doi10.1016/j.atherosclerosis.2014.10.012-
dc.identifier.hkuros250623-
dc.identifier.volume237-
dc.identifier.issue2-
dc.identifier.spage853-
dc.identifier.epage861-

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