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Therapeutic effects of mycobacterial secretory proteins against established asthma in BALB/c mice.

Han ER, Choi IS, Choi HG, Kim HJ - Allergy Asthma Immunol Res (2012)

Bottom Line: 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).Thus, allergic asthma could be effectively treated with mycobacterial secretory proteins.

View Article: PubMed Central - PubMed

Affiliation: Department of Allergy, Chonnam National University Medical School, Gwangju, Korea.

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.

No MeSH data available.


Related in: MedlinePlus

The time course of the experiment. OVA, ovalbumin; ip, intraperitoneal; BCG, bacille Calmette-Guérin; MBPT, methacholine bronchoprovocation test.
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Figure 1: The time course of the experiment. OVA, ovalbumin; ip, intraperitoneal; BCG, bacille Calmette-Guérin; MBPT, methacholine bronchoprovocation test.

Mentions: Mice were sensitized and provoked with ovalbumin (Grade V; Sigma-Aldrich, St. Louis, MO, USA), and those that developed AHR to methacholine (Sigma) were selected as the experimental animals, as described previously (Fig. 1).18 AHR was defined as airway sensitivity >95% of the confidence interval of the non-sensitized normal control group, and the asthma threshold was 16.3 mg/mL. Mice with established AHR were treated intraperitoneally with live BCG or mycobacterial secretory proteins. One week after treatment, they underwent a second provocation test with ovalbumin, followed by a methacholine challenge test, and then were sacrificed so that inflammatory cell numbers in bronchoalveolar lavage (BAL) fluid and around bronchi (<500 µm), and cytokine levels in the splenocyte culture supernatants, could be quantified.


Therapeutic effects of mycobacterial secretory proteins against established asthma in BALB/c mice.

Han ER, Choi IS, Choi HG, Kim HJ - Allergy Asthma Immunol Res (2012)

The time course of the experiment. OVA, ovalbumin; ip, intraperitoneal; BCG, bacille Calmette-Guérin; MBPT, methacholine bronchoprovocation test.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3378928&req=5

Figure 1: The time course of the experiment. OVA, ovalbumin; ip, intraperitoneal; BCG, bacille Calmette-Guérin; MBPT, methacholine bronchoprovocation test.
Mentions: Mice were sensitized and provoked with ovalbumin (Grade V; Sigma-Aldrich, St. Louis, MO, USA), and those that developed AHR to methacholine (Sigma) were selected as the experimental animals, as described previously (Fig. 1).18 AHR was defined as airway sensitivity >95% of the confidence interval of the non-sensitized normal control group, and the asthma threshold was 16.3 mg/mL. Mice with established AHR were treated intraperitoneally with live BCG or mycobacterial secretory proteins. One week after treatment, they underwent a second provocation test with ovalbumin, followed by a methacholine challenge test, and then were sacrificed so that inflammatory cell numbers in bronchoalveolar lavage (BAL) fluid and around bronchi (<500 µm), and cytokine levels in the splenocyte culture supernatants, could be quantified.

Bottom Line: 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).Thus, allergic asthma could be effectively treated with mycobacterial secretory proteins.

View Article: PubMed Central - PubMed

Affiliation: Department of Allergy, Chonnam National University Medical School, Gwangju, Korea.

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.

No MeSH data available.


Related in: MedlinePlus