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J Microbiol Immunol Infect. 2016 Feb;49(1):16-23. doi: 10.1016/j.jmii.2014.07.011. Epub 2014 Oct 8.

Oral intake of Lactobacillus rhamnosus M21 enhances the survival rate of mice lethally infected with influenza virus.

Author information

1
Department of Veterinary Immunology, College of Veterinary Medicine, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul, 143-701, Republic of Korea; Inhalation Toxicology Center, KIT Jeongeup Campus, 1051, Shinjeong-dong, Jeongeup, 580-185, Republic of Korea.
2
Department of Veterinary Immunology, College of Veterinary Medicine, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul, 143-701, Republic of Korea.
3
M21 Company Limited, 649-27 Samjon-ri, Songsan-myeon, Hwaseong-si, Kyungki-do, 445-871, Republic of Korea.
4
Department of Veterinary Immunology, College of Veterinary Medicine, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul, 143-701, Republic of Korea. Electronic address: paseyo@konkuk.ac.kr.

Abstract

BACKGROUND:

Influenza viruses cause acute respiratory disease. Because of the high genetic variability of viruses, effective vaccines and antiviral agents are limited. Considering the fact that the site of influenza virus entry is the mucosa of the upper respiratory tract, probiotics that can enhance mucosal immunity as well as systemic immunity could be an important source of treatment against influenza infection.

METHODS:

Mice were fed with Lactobacillus rhamnosus M21 or skim milk and were challenged with influenza virus. The resulting survival rate, lung inflammation, and changes in the cytokine and secretory immunoglobulin A (sIgA) levels were examined.

RESULTS:

Because of infection (influenza virus), all the mice in the control group and 60% of the mice in the L. rhamnosus M21 group died; however, the remaining 40% of the mice fed with L. rhamnosus M21 survived the infection. Pneumonia was severe in the control group but moderate in the group treated with L. rhamnosus M21. Although there were no significant changes in the proinflammatory cytokines in the lung lysates of mice collected from both groups, levels of interferon-γ and interleukin-2, which are representative cytokines of type I helper T cells, were significantly increased in the L. rhamnosus M21-treated group. An increase in sIgA as well as the diminution of inflammatory cells in bronchoalveolar lavage fluid was also observed in the L. rhamnosus M21-treated group.

CONCLUSION:

These results demonstrate that orally administered L. rhamnosus M21 activates humoral as well as cellular immune responses, conferring increased resistance to the host against influenza virus infection.

KEYWORDS:

cytokines; immunoglobulin A; influenza; lung infection; probiotics

PMID:
25304268
DOI:
10.1016/j.jmii.2014.07.011
[Indexed for MEDLINE]
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