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Nair, S. and Ramaswamy, P.A. and Ghosh, S. and Joshi, D.C. and Pathak, N. and Siddiqui, I. and Sharma, P. and Hasnain, S.E. and Mande, S.C. and Mukhopadhyay, Sangita (2009) The PPE18 of Mycobacterium tuberculosis Interacts with TLR2 and Activates IL-10 Induction in Macrophage. The Journal of Immunology, 183 (10). pp. 6269-6281. ISSN 0022-1767

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The pathophysiological functions of proline-glutamic acid (PE)/proline-proline-glutamic acid (PPE) family of proteins of Mycobacterium tuberculosis are not well understood. In this study, we demonstrate that one of the PPE proteins, PPE18 can stimulate macrophages to secrete IL-10, known to favor a Th2 type response. The recombinant PPE18 was found to specifically interact with the TLR2 leading to an early and sustained activation of p38 MAPK, which is critical for IL-10 induction. In silico docking analyses and mutation experiments indicate that PPE18 specifically interacts with the leucine rich repeat 11 approximately 15 domain of TLR2 and the site of interaction is different from that of a synthetic lipopeptide Pam(3)CSK(4) known to activate predominantly ERK 1/2. When PMA-differentiated THP-1 macrophages were infected with a mutant Mycobacterium tuberculosis strain lacking the PPE18, produced poorer levels of IL-10 as compared with those infected with the wild-type strain. In contrast, an M. smegmatis strain overexpressing the PPE18 induced higher levels of IL-10 in infected macrophages. Our data indicate that the PPE18 protein may trigger an anti-inflammatory response by inducing IL-10 production.

Item Type: Article
Additional Information: [Open Access from the Publisher]
Depositing User: Dr P Divakar
Date Deposited: 27 Aug 2015 07:15
Last Modified: 16 Dec 2015 06:21
URI: http://cdfd.sciencecentral.in/id/eprint/403

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