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Article Publish Status: FREE
Abstract Title:

Effect of Lactobacillus rhamnosus GG immunopathologic changes in chronic mouse asthma model.

Abstract Source:

J Microbiol Immunol Infect. 2019 Mar 23. Epub 2019 Mar 23. PMID: 30952512

Abstract Author(s):

Chia-Ta Wu, Fei-Hung Lin, Yu-Tzu Lee, Min-Sho Ku, Ko-Haung Lue

Article Affiliation:

Chia-Ta Wu

Abstract:

BACKGROUND: Asthma is a heterogeneous inflammatory disorder of the airway. A Th2 response usually contributes to high levels of allergen-specific IgE and eosinophilic airway inflammation. Several findings have demonstrated that neutrophils, not eosinophils, are the major inflammatory cells in chronic asthma patients with steroid-resistance. Lactobacillus rhammosus GG (LGG) exhibits anti-inflammatory properties on OVA-induced acute airway inflammation.

OBJECTIVE: We hypothesized that orally administrated LGG should reduce airway remodeling in chronic experimental models.

METHODS: Female Balb/c mice were sensitized with OVA. LGG was used to investigate whether oral administrations of LGG inhibited OVA-induced airway inflammation in a chronic asthma model and the different intervention times between LGG pre-treatment and post-treatment groups. BALF was analyzed with Liu's stain and ELISA assay. Lung histopathology was assayed with HE, IHC and Masson's trichrome staining. Lung tissues were assayed with PCR (T-bet, GATA3, RORrt and Foxp3). Many cytokines were detected in the serum and BALF.

RESULTS: LGG significantly decreased the number of infiltrating inflammatory cells. We also found that the oral LGG group suppressed not only Th2 cytokine, but also IL-17, TNF-α and HMGB1 in the BALF levels. However, GATA3 and RORrt decreased significantly in the RNA level in the LGG groups, but the T-bet and Foxp3 increased in the RNA level.

CONCLUSIONS: LGG not only had anti-inflammatory effects on OVA-induced airway inflammation, but also improved airway remodeling and collagen expression in the chronic asthma mouse model. Moreover, LGG might be an additional or supplementary therapy for allergic airway diseases.

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