Dietary lactosucrose suppresses influenza A (H1N1) virus infection in mice.

Abstract

This study examined the effects of lactosucrose (4(G)-β-D-galactosylsucrose) on influenza A virus infections in mice. First, the effects of lactosucrose on fermentation in the cecum and on immune function were investigated. In female BALB/c mice, lactosucrose supplementation for 6 weeks promoted cecal fermentation and increased both secretory IgA (SIgA) levels in feces and total IgA and IgG2a concentrations in serum. Both the percentage of CD4(+) T cells in Peyer's patches and the cytotoxic activity of splenic natural killer (NK) cells increased significantly in response to lactosucrose. Next, we examined the effects of lactosucrose on low-dose influenza A virus infection in mice. After 2 weeks of dietary supplementation with lactosucrose, the mice were infected with low-dose influenza A virus. At 7 days post infection, a comparison with control mice showed that weight loss was suppressed, as were viral titers in the lungs. In the spleens of lactosucrose-fed mice, there was an increase in the percentage of NK cells. Lastly, mice fed lactosucrose were challenged with a lethal dose of influenza A virus. The survival rate of these mice was significantly higher than that of mice fed a control diet. These results suggested that lactosucrose supplementation suppresses influenza A virus infection by augmenting innate immune responses and enhancing cellular and mucosal immunity.

• Authors: Eriko Kishino, Naho Takemura, Hisaharu Masaki, Tetsuya Ito, Masatoshi Nakazawa
• Journal: Bioscience of microbiota, food and health (Biosci Microbiota Food Health) Vol. 34 Issue 4 Pg. 67-76 ( 2015) ISSN: 2186-6953 [Print] Japan
• PMID: 26594606 (Publication Type: Journal Article)