C-reactive protein promotes vascular endothelial dysfunction partly via activating adipose tissue inflammation in hyperlipidemic rabbits

详细信息    查看全文

• 作者：YangXin Chen ; XiaoQiao Wang ; JingTing Mai ; XiaoMiao Zhao ; YongHong Liang ; MiaoNing Gu ; ZhongQing Chen ; RuQiong Nie ; JingFeng Wang
• 关键词：C-reactive protein ; Adipose tissue ; Inflammation ; Endothelial dysfunction
• 刊名：International Journal of Cardiology
• 出版年：2013
• 出版时间：3 October, 2013
• 年：2013
• 卷：168
• 期：3
• 页码：2397-2403
• 全文大小：978 K

文摘

Background

Endothelial dysfunction is the basic and original sign of atherogenesis. Some evidences show that C-reactive protein (CRP) and perivascular adipose tissue (PVAT) play a pivotal role in atherosclerosis. However, the effects of CRP on atherosclerosis and the related mechanisms require elucidation.

Methods

The levels of basic total cholesterol, low-density lipoprotein cholesterol, triglyceride, CRP, tumor necrosis factor-¦Á (TNF-¦Á), interleukin-6 (IL-6), nitric oxide (NO) and endothelin-1 (ET-1) were respectively measured in rabbits, endothelium-dependent vasorelaxation function was also evaluated. Animals were randomly divided into two groups: PVAT(?) and PVAT(+) group (removing or keeping pericarotid adipose tissue (PCAT)). Both of the two groups were exposed to a high-fat diet for six-week, and then sustained CRP treatment was performed for a week, at this time point all the above parameters were remeasured. In addition, mRNA and protein expression of TNF-¦Á, IL-6, and macrophage chemoattractant protein-1 (MCP-1) were respectively evaluated by Polymerase Chain Reaction and immunoblotting in PCAT and cultured adipocytes treated by CRP.

Results

High-fat diet greatly increased the serum lipids and inflammatory markers, induced endothelial dysfunction and imbalance between NO and ET-1, increased mRNA and protein expression of TNF-¦Á, IL-6, MCP-1 and enhanced macrophage infiltration of PCAT. CRP treatment could further promote macrophage infiltration of PVAT, induce the imbalance between NO and ET-1, aggravate endothelial dysfunction especially in PVAT(+) arteries, and could also enhance the above-mentioned mRNA and protein expression in PCAT and cultured adipocytes.

Conclusions

CRP could significantly promote endothelial dysfunction in high-fat diet rabbits especially in PVAT(+) groups, which may be partly mediated by activating inflammatory reaction of adipose tissue.