Effect of atorvastatin on tumor necrosis factor alpha serum concentration and mRNA expression of adipose in hypercholesterolemic rabbits.

Abstract:

:Tumor necrosis factor alpha (TNFalpha) is an inflammatory cytokine involved in atherogenesis. Adipose tissue is an important source of endogenous TNFalpha production. The aim of this study was to evaluate the effect of atorvastatin on TNFalpha serum concentration and mRNA expressions of subcutaneous adipose in hypercholesterolemic rabbits. Sixteen rabbits fed with a high-cholesterol diet for 8 weeks were randomly divided into 2 groups: (1) the high-cholesterol group (n=8) was maintained on a high-cholesterol diet for 6 weeks; (2) the atorvastatin group (n=8) had the same high-cholesterol diet plus atorvastatin (2.5 mg/kg/d) for 6 weeks. A control group (n=5) was fed with a normal diet for 14 weeks. Subcutaneous adipose was collected for mRNA analysis. Additionally, the direct effect of atorvastatin on TNFalpha release and mRNA expression was assayed in primary rabbit adipocytes. TNFalpha levels in serum and adipocyte culture supernatant were measured by ELISA. RT-PCR was used to evaluate TNFalpha mRNA expression in adipose and adipocytes. Serum TNFalpha concentration was significantly associated with serum total cholesterol (TC) and low-density lipoprotein-cholesterol (LDL-C) (both P<0.01). Compared with the control group, rabbits fed with a high-cholesterol diet showed higher levels of TNFalpha serum concentration and mRNA expression of adipose, both of which were significantly reduced by atorvastatin treatment (both P<0.05). TNFalpha mRNA expressions of adipose were significantly correlated with circulating TNFalpha levels among the 3 groups (r=0.51, P<0.05). Atorvastatin dose-dependently inhibited lipopolysaccharide (LPS)-induced TNFalpha secretion and mRNA expression in cultured adipocytes. In conclusion, atorvastatin can directly inhibit TNFalpha expression and secretion in adipocytes. Atorvastatin reduced TNFalpha serum concentration in hypercholesterolemic rabbits, which might be because of its cholesterol-lowering effect and direct inhibition of TNFalpha expression in adipose.

journal_name

J Cardiovasc Pharmacol

authors

Zhao SP,Wu ZH,Wu J,Hong SC,Deng P

doi

10.1097/01.fjc.0000167017.69468.61

subject

Has Abstract

pub_date

2005-08-01 00:00:00

pages

185-9

issue

2

eissn

0160-2446

issn

1533-4023

pii

00005344-200508000-00009

journal_volume

46

pub_type

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