Mycobacterium Tuberculosis ManLAM Inhibits T-cell-receptor Signaling by Interference with ZAP-70, Lck and LAT Phosphorylation

Overview

Journal Cell Immunol

Publisher Elsevier

Specialties Allergy & Immunology
Cell Biology

Date 2012 Apr 18

PMID 22507872

Citations 43

Authors

Robert N Mahon

Obondo J Sande

Roxana E Rojas

Alan D Levine

Clifford V Harding

W Henry Boom

Affiliations

Soon will be listed here.

Abstract

Immune evasion is required for Mycobacterium tuberculosis to survive in the face of robust CD4(+) T cell responses. We have shown previously that M. tuberculosis cell wall glycolipids, including mannose capped lipoarabinomannan (ManLAM), directly inhibit polyclonal murine CD4(+) T cell activation by blocking ZAP-70 phosphorylation. We extended these studies to antigen-specific murine CD4(+) T cells and primary human T cells and found that ManLAM inhibited them as well. Lck and LAT phosphorylation also were inhibited by ManLAM without affecting their localization to lipid rafts. Inhibition of proximal TCR signaling was temperature sensitive, suggesting that ManLAM insertion into T cell membranes was required. Thus, M. tuberculosis ManLAM inhibits antigen-specific CD4(+) T cell activation by interfering with very early events in TCR signaling through ManLAM's insertion in T cell membranes.

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