Critical role of the C5a-activated neutrophils in high-fat diet-induced vascular inflammation

Mizuko Osaka, Shunsuke Ito, Masaki Honda, Yukihiro Inomata, Kensuke Egashira, Masayuki Yoshida

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Abstract

Exceed and chronic high-fat diet (HFD) contributes to the diagnosis and development of atherosclerosis, obesity, and metabolic syndrome. However, the key molecular component(s) triggered by HFD responsible for initiating vascular inflammation remain unknown. We observed that feeding HFD for 4 weeks is sufficient to induce leukocyte recruitment in the femoral artery of wild-type mice. Neutrophil-and monocyte-depletion analyses confirmed the preferential recruitment of neutrophils in these mice. Protein analysis of sera from HFD-fed mice revealed a marked elevation of complement component C5a levels. Exogenous C5a alone induced leukocyte recruitment, which was abolished by a C5a-receptor antagonist. We also examined the role of neutrophil-derived MCP-1 in accumulation of leukocytes in the artery. These results demonstrated a previously unrecognized role for C5a and neutrophils in the early onset of HFD-induced vascular inflammation. Further study may help in elucidating a novel regulatory pathway to control diet-induced inflammation such as that in case of atherosclerosis.

Original languageEnglish
Article number21391
JournalScientific reports
Volume6
DOIs
Publication statusPublished - Feb 19 2016

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Osaka, M., Ito, S., Honda, M., Inomata, Y., Egashira, K., & Yoshida, M. (2016). Critical role of the C5a-activated neutrophils in high-fat diet-induced vascular inflammation. Scientific reports, 6, [21391]. https://doi.org/10.1038/srep21391