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Environ Toxicol Pharmacol. 2015 Nov;40(3):924-30. doi: 10.1016/j.etap.2015.09.020. Epub 2015 Oct 22.

The effect of lipopolysaccharide-induced obesity and its chronic inflammation on influenza virus-related pathology.

Author information

1
Department of Biotechnology, The Catholic University of Korea, Bucheon, Gyeonggi-do, South Korea.
2
SK Chemical, Sampyeong-dong, Bundang-gu, Seongnam-si, Gyeonggi-do, South Korea.
3
Department of Biotechnology, The Catholic University of Korea, Bucheon, Gyeonggi-do, South Korea. Electronic address: jhnam@catholic.ac.kr.

Abstract

Obese individuals show increased susceptibility to infection, low vaccine efficacy, and worse pathophysiology. However, it is unclear how obesity affects these events. The aim of this study was to investigate the effect of obesity-triggered chronic inflammation on immune cells after influenza virus infection. Control and lipopolysaccharide mice, in which an osmotic pump continually released Tween saline or lipopolysaccharide, were prepared and 3 weeks later were infected with pandemic H1N1 2009 influenza A virus. In lipopolysaccharide mice, we found a reduction in macrophage activation markers in the steady state, and reduced production of pro-inflammatory cytokines including tumor necrosis factor-α, interleukin-1β, and interleukin-6, in restimulated peritoneal macrophages. Interestingly, lipopolysaccharide-triggered chronic inflammation exacerbated the severity of pathological symptoms in the lungs after challenge with influenza virus. Taken together, the increased severity of virus-induced symptoms in obese individuals with chronic inflammation may be, at least partially, caused by macrophage dysfunction.

KEYWORDS:

Influenza virus; Low-level chronic inflammation; Obesity; Osmotic pump

PMID:
26509733
DOI:
10.1016/j.etap.2015.09.020
[Indexed for MEDLINE]

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