Dutta NK, McLachlan J, Mehra S, Kaushal D. Humoral and lung immune responses to Mycobacterium tuberculosis infection in a primate model of protection
.
ACTA ACUST UNITED AC 2014;
3:47-51. [PMID:
25197327 DOI:
10.1016/j.trivac.2014.02.001]
[Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Recently we reported (Mehra et al., 2013), that lung granulomas from Mycobacterium bovis Bacille Calmette-Guérin (BCG)-vaccinated cynomolgus macaques exhibit upon challenge with M. tuberculosis a more balanced expression of α- and β-chemokines, relative to comparable samples from sham-vaccinated animals by comparative transcriptomics. Here, we studied the recruitment of immune cells to blood and lungs in M. tuberculosis-infected macaques as a function of prior BCG-vaccination. Vaccination initially enhanced the levels of both macrophages and lymphocytes in blood. In contrast, significantly more CD4+ lymphocytes were later recruited to the lungs of sham-vaccinated animals compared with earlier times/BCG vaccinated animals. BCG-vaccination had a short-lived impact on the anti-M. tuberculosis response. M. tuberculosis continued to replicate in the lung even in the wake of increased CD4+ T cell recruitment to primate lungs, indicating that immune subversive mechanisms are key to its survival in vivo.
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