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Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Scientific reports - 25 Nov 2015

Le Chevalier F, Cascioferro A, Frigui W, Pawlik A, Boritsch EC, Bottai D, Majlessi L, Herrmann JL, Brosch R

Link to Pubmed [PMID] – 26603639

Sci Rep 2015;5:16918

Interactive link to publication: Scientific Reports: 5: 16918 (2015)

Abstract:

Mycobacterium tuberculosis, the agent of human tuberculosis has developed different virulence mechanisms and virulence-associated tools during its evolution to survive and multiply inside the host. Based on previous reports and by analogy with other bacteria, phospholipases C (PLC) of M. tuberculosis were thought to be among these tools. To get deeper insights into the function of PLCs, we investigated their putative involvement in the intracellular lifestyle of M. tuberculosis, with emphasis on phagosomal rupture and virulence, thereby re-visiting a research theme of longstanding interest. Through the construction and use of an M. tuberculosis H37Rv PLC-null mutant (ΔPLC) and control strains, we found that PLCs of M. tuberculosis were not required for induction of phagosomal rupture and only showed marginal, if any, impact on virulence of M. tuberculosis in the cellular and mouse infection models used in this study. In contrast, we found that PLC-encoding genes were strongly upregulated under phosphate starvation and that PLC-proficient M. tuberculosis strains survived better than ΔPLC mutants under conditions where phosphatidylcholine served as sole phosphate source, opening new perspectives for studies on the role of PLCs in the lifecycle of M. tuberculosis.

http://www.ncbi.nlm.nih.gov/pubmed/26603639