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Mycobacterium tuberculosis and dendritic cells: recognition, activation and functional implications Sinha A; Salam N; Gupta S; Natarajan KIndian J Biochem Biophys 2007[Oct]; 44 (5): 279-88The highly complex nature of interactions of Mycobacterium tuberculosis with cells of the immune system has puzzled researchers the world-over in understanding the pathogenesis and immunology associated with tuberculosis (TB). This has contributed to the delay in development of effective vaccine(s) for TB. Several excellent studies have provided only a glimpse of the kind and degree of immune responses elicited following infection by mycobacteria. Preferred entry via respiratory route results in the capture of mycobacteria by alveolar macrophages that eventually become their long-term hosts. Since the pathogen is rarely cleared this has resulted in the human population serving as a large reservoir for mycobacteria. Owing to their unique ability to prime naive and memory T cells, dendritic cells (DCs) play important and indispensable roles in the initiation and maintenance of protective immune responses following infection. The kind of immune response initiated by DCs with respect to mycobacteria determines the character of immune responses mounted by the host against the pathogen. The profile of cytokines and chemokines secreted as a result of infection of DCs by mycobacteria further plays an important role in defining the course of infection. This minireview attempts to highlight key interactions of mycobacteria with dendritic cells. We discus the uptake of mycobacteria by DCs followed by DC activation and the spectrum of immune responses initiated by infected/activated DCs, followed by numerous ways the pathogen has devised to subvert protective responses.|*Models, Immunological[MESH]|Cell Communication/*immunology[MESH]|Dendritic Cells/*immunology/*microbiology[MESH]|Humans[MESH]|Mycobacterium tuberculosis/*immunology[MESH]|Tuberculosis/*microbiology/*pathology[MESH] |
