alexa A matrix metalloproteinase inhibitor promotes granuloma formation during the early phase of Mycobacterium tuberculosis pulmonary infection.
Immunology

Immunology

Journal of Clinical & Cellular Immunology

Author(s): Izzo AA, Izzo LS, Kasimos J, Majka S

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Abstract OBJECTIVE: The host response to pulmonary Mycobacterium tuberculosis (Mtb) infection results in granuloma formation in an effort to limit infection, but the host immune cells also provide an environment in which Mtb persists. Granuloma formation requires immune cell infiltration and concurrent extensive remodeling of pulmonary tissue which we hypothesize to be the result of increased matrix metalloproteinases (MMP) activity. DESIGN: C57BL/6 mice infected with virulent Mtb (H37Rv) via intratracheal inoculation were treated with a synthetic inhibitor of MMP activity (BB-94). Mice were assessed for colony forming units, granuloma morphology, leukocyte recruitment and cytokine levels over 90 days of infection. RESULTS: BB-94 treated mice had significantly decreased numbers of pulmonary and blood-borne Mtb early during disease, increased collagen deposition within early granulomas and significantly decreased pulmonary leukocyte recruitment when compared to vehicle-treated, Mtb-infected mice. Cytokine expression did not differ significantly between groups. CONCLUSION: Events of early granuloma formation can be modified by inhibiting MMP activity, by decreasing leukocyte recruitment, a major source of MMPs during infection, enhancing the establishment of granulomas and decreasing blood-borne dissemination of Mtb. This article was published in Tuberculosis (Edinb) and referenced in Journal of Clinical & Cellular Immunology

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