Therapeutic Effects of Mycobacterial Secretory Proteins Against Established Asthma in BALB/c Mice

Overview

Journal Allergy Asthma Immunol Res

Date 2012 Jul 4

PMID 22754715

Citations 6

Authors

Eui-Ryoung Han

Inseon S Choi

Han-Gyu Choi

Hwa-Jung Kim

Affiliations

Soon will be listed here.

Abstract

Purpose: Live/killed mycobacteria and culture supernatants can suppress asthmatic reactions. This study investigated whether mycobacterial secretory proteins have therapeutic effects on asthma.

Methods: Mycobacterium bovis bacille Calmette-Guérin (BCG; 2×10(5) CFUs) and mycobacterial secretory proteins (Ag85 complex, 38-kDa protein or MPB70; 4 or 20 µg) were administered intraperitoneally to female BALB/c mice with established airway hyperresponsiveness. One week after treatment, the mice underwent a methacholine challenge test, and then inflammatory cell numbers in bronchoalveolar lavage fluid (BAL) and around bronchi (<500 µm), and cytokine levels in splenocyte supernatants, were assessed.

Results: BCG and all of the tested secretory proteins significantly improved airway sensitivity compared to baseline values (P<0.05). The secretory protein Ag85 complex significantly suppressed airway reactivity also (P<0.05), while 38-kDa protein significantly suppressed reactivity and maximal narrowing (P<0.05). The number of eosinophils in BAL and around bronchi, and the goblet cell proportion, were also significantly reduced in mice in both the BCG and secretory protein groups compared to the asthma control group. IFN-γ/IL-5 ratios were significantly higher in mice treated with BCG, 4 µg MPB70 or 4 µg 38-kDa protein than in asthma control mice (P<0.05), and were negatively associated with airway hyperresponsiveness, peribronchial eosinophil numbers and goblet cell proportion (all P<0.05). IL-17A was positively correlated with IL-5 (r=0.379, P<0.001), maximal airway narrowing, peribronchial eosinophil numbers and goblet cell proportion (all P<0.05).

Conclusions: Secretory proteins from BCG and M. tuberculosis and live BCG were effective against established asthma, their effects being accompanied by increased IFN-γ/IL-5 ratios. Thus, allergic asthma could be effectively treated with mycobacterial secretory proteins.

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