Abstract：
:Connective tissue growth factor (CTGF) is expressed in atherosclerotic plaques. It is generally recognized that CTGF contributes to atherosclerosis by stimulating vascular smooth muscle cell (VSMC) proliferation and extracellular matrix production during the development of atherosclerosis. Recent studies indicate that CTGF may also contribute to plaque destabilization as it induces apoptosis and stimulates MMP-2 expression in VSMCs. Thiazolidinediones (TZDs), a new class of insulin sensitizing drugs for type 2 diabetes, inhibit atherosclerosis. However, their effect on CTGF expression in atherosclerotic plaques remains unknown. In this study, male LDL receptor-deficient mice were fed high-fat diet for 4 months to induce the formation of atherosclerotic plaques and then given the high-fat diet with or without pioglitazone for the next 3 months. At the end of the 7-month study, CTGF expression in aortic atherosclerotic lesions was examined. Results showed that CTGF expression was increased in mice fed the high-fat diet by seven-fold as compared to that in mice fed normal chow, but the treatment with pioglitazone significantly inhibited the high-fat diet-induced CTGF expression. To verify these in vivo observations, in vitro studies using human aortic SMC were conducted. Quantitative real-time PCR and Western blot showed that pioglitazone inhibited TGF-beta-stimulated CTGF expression. In conclusion, the present study has demonstrated that pioglitazone inhibits CTGF expression in mouse advanced atherosclerotic plaques and in cultured human SMCs, and hence unveiled a possible mechanism potentially involved in the inhibition of atherosclerosis by TZD.
journal_name
Atherosclerosisjournal_title
Atherosclerosisauthors
Game BA,He L,Jarido V,Nareika A,Jaffa AA,Lopes-Virella MF,Huang Ydoi
10.1016/j.atherosclerosis.2006.06.025subject
Has Abstractpub_date
2007-05-01 00:00:00pages
85-91issue
1eissn
0021-9150issn
1879-1484pii
S0021-9150(06)00390-Xjournal_volume
192pub_type
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