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Differential regulation of protein kinase C isoforms of macrophages by pathogenic and non-pathogenic mycobacteria

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Abstract

Given the fact that Mycobacterium tuberculosis (Mtb) may respond to the intracellular milieu of the macrophage with the induction of environmentally regulated genes required for survival and growth of the bacteria we assumed that the protein kinases may also be the factors in Mycobacterium–macrophage interaction. Since, protein kinases play a major role in various critical cellular processes including regulation of immune responses, we describe the fate of expression and phosphorylation of protein kinase C in macrophage cell lines exposed to Mtb H37Rv and raised the question whether the change in the events of expression and phosphorylation are the results of direct interaction of bacilli with macrophages and/or, are also indirectly mediated by specific cytokines that are induced in response to exposure. Our results show that only novel PKCs are phosphorylated during infection of macrophages by pathogenic and non-pathogenic mycobacteria and the alteration is a result of direct host-bacilli association which is independent of cytokines as mediators. Expression of PKC-α (conventional PKC isoform) was down regulated by Mtb H37Rv. In contrast the non-pathogenic fast grower Mycobacterium smegmatis (MS) increased the expression and phosphorylation of PKC-α. PKC-α was also increased in macrophages treated with serum of mice immunized with Mtb H37Rv. The study has shown that pathogenic and non-pathogenic mycobacteria categorically select the type of protein kinases C for activation/deactivation.

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Acknowledgment

We thank Director, CDRI for his encouragement and support. Technical assistance by Mr. A. P. Singh is appreciated. SKC is recipient of CSIR-UGC Fellowship. The communication number assigned to this manuscript by CDRI is 7118.

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Correspondence to Kishore K. Srivastava.

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Chaurasiya, S.K., Srivastava, K.K. Differential regulation of protein kinase C isoforms of macrophages by pathogenic and non-pathogenic mycobacteria. Mol Cell Biochem 318, 167–174 (2008). https://doi.org/10.1007/s11010-008-9866-6

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  • DOI: https://doi.org/10.1007/s11010-008-9866-6

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