期刊
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
卷 176, 期 -, 页码 76-84出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2019.03.068
关键词
PM2.5; Plaque vulnerability; Atherosclerosis; Foam cell; TLR4
资金
- Jiangsu Province Health and Family Planning Commission Scientific Research Project [H2017011]
- Jiangsu Provincial Medical Youth Talent [QNRC2016432]
Clinical evidence has shown an elevated myocardial infarction (MI) risk after PM2.5 (particulate matter < 2.5 mu m) exposure. Incident MI may result from rupture of vulnerable plaques. To test whether PM2.5 could promote plaque vulnerability, we exposed PM2.5 to apoe(-/-) mice by intranasal instillation. We detected the lipid, collagen, macrophage and smooth muscle cells (SMCs) content, and fibrous cap thickness to evaluate the plaque vulnerability. Plaques in HFD-fed mice with PM2.5 treatment for 24 weeks had increased lipid content and macrophage recruitment, and reduced collagen content, fibrous cap thickness and SMCs infiltration. Besides, 4-week exposure to PM2.5 could reduce the fibrous cap thickness, collagen content, but increase the macrophage infiltration and SMCs loss in a rapid atherosclerosis model. In existing plaques, PM2.5 could also decrease the fibrous cap thickness, collagen content. In RAW264.7, PM2.5 could promote the transformation of macrophage into foam cells. The expression of TLR4/MyD88/NF kappa B and CD36 were upregulated by PM2.5 treatment. Besides, the expression of CD36 promoted by PM2.5 was downregulated by the TLR4 inhibitor or MyD88/NE kappa B SiRNA. In conclusion, our data indicated that short- and long-term PM2.5 exposure increased plaque vulnerability. The underlying mechanism might be the PM2.5-enhanced formation of foam cells via TLR4/MyD88/NF kappa B pathway.
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