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Anti-influenza virus effects of both live and non-live Lactobacillus acidophilus L-92 accompanied by the activation of innate immunity
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Anti-influenza virus effects of both live and non-live Lactobacillus acidophilus L-92 accompanied by the activation of innate immunity
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Journal Article
Anti-influenza virus effects of both live and non-live Lactobacillus acidophilus L-92 accompanied by the activation of innate immunity
2013
Overview
The antiviral effects of both a live and non-live Lactobacillus acidophilus strain L-92 (L-92) were investigated by oral administration (10 mg/mouse per d) daily for 21 d in a mouse model infected intranasally with influenza virus (H1N1). Virus titres in the lung of mice administered either live or non-live L-92 cells daily for 15 d were repressed 6 d after virus infection compared with the control group. Natural killer (NK) activity in the orally administered non-live L-92 group was higher compared with that of the control group before virus infection and on day 6. In contrast, NK activity in the live L-92 group compared with the control group was not significantly changed on both days, but was significantly higher on day 1. In contrast, live L-92 showed a greater repression of virus proliferation compared with non-live L-92, 6 d after the infection. Live L-92 decreased the number of neutrophils in the lung and suppressed lung weight, leading to the consequent deterioration of consolidation scores of the lung. These results indicated that pretreatment of live or non-live L-92 cells had protective effects against influenza virus infection. Among the measured cytokines and chemokines, eotaxin, macrophage colony-stimulating factor, IL-1β, RANTES (regulated on activation, normal T cell expressed and secreted) and interferon-α were significantly increased in the lung: IL-17 was significantly increased in Peyer's patch of the live L-92 group compared with the control group. A mechanistic study suggested that the enhancement of NK activity in the lung caused by stimulating various antiviral cytokines and chemokines after the oral administration of L-92 cells might be important in protecting against virus infection.
Publisher
Cambridge University Press
Subject
/ Animals
/ Antiviral Agents - therapeutic use
/ Biological and medical sciences
/ Female
/ Fundamental and applied biological sciences. Psychology
/ Influenza A Virus, H1N1 Subtype
/ Killer Cells, Natural - metabolism
/ Lactobacillus acidophilus - immunology
/ macrophage colony-stimulating factor
/ Mice
/ Orthomyxoviridae Infections - drug therapy
/ Orthomyxoviridae Infections - immunology
/ Orthomyxoviridae Infections - virology
/ Peyer's Patches - immunology
/ Peyer's Patches - metabolism
/ Probiotics - therapeutic use
/ Vertebrates: anatomy and physiology, studies on body, several organs or systems
/ Viral diseases of the respiratory system and ent viral diseases
/ viruses
