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Influenza is an acute viral respiratory disease that can also cause gastroenteritis-like symptoms, such as abdominal pain, nausea, vomiting, and diarrhea. Immune dysfunction of adipose tissue is involved in the occurrence and prognosis of influenza viral pneumonia. In this study, we analyzed intestinal and adipose immune responses in mice infected with influenza virus and found that the impairment of intestinal and adipose immunity to influenza virus infection could be reversed by treatment with puerarin, a medicinal compound isolated from Pueraria lobata (called "gegen" in Chinese). We found that the lungs, small intestines (duodenum, ileum, jejunum) and large intestines (colon and rectum) of infected mice showed obvious inflammatory lesions, with significantly increased levels of virus, inflammatory cytokines (interleukin [IL]-6, IL-17, and tumor necrosis factor-α), Toll-like receptors 3, 4, and 9, and integrin αvβ3 and α4, and a decreased level of secreted IgA compared to the normal control group (NC) (P &lt; 0.05-0.001). Influenza virus infected mesenteric lymph nodes and adipose tissue, and adipokines (leptin, visfatin, "chemerin", and adiponectin) of lung and mesenteric adipose tissue were dysregulated. Puerarin treatment reversed the impairment of the intestinal and adipose immune responses in mice infected with influenza virus. Our findings suggest that influenza virus can infect adipose tissue and lead to intestinal adipose immune dysfunction in normal-weight mice and that the impairment of the intestinal and adipose immune response to influenza virus infection can be reversed by puerarin treatment.

Puerarin reduces impairment of intestinal and adipose immune responses to influenza virus infection in mice