Mitogen-activated protein kinases regulate Mycobacterium avium-induced tumor necrosis factor-alpha release from macrophages.
Tumor necrosis factor-alpha (TNF-alpha) is one of the key cytokines elicited by host macrophages upon challenge with pathogenic mycobacteria. Infection of human peripheral blood mononuclear cells or the murine macrophage cell line J774A-1 with Mycobacterium avium induced activation of the mitogen-activated protein kinases (MAPKs) ERK1/2, p38 and c-Jun N-terminal kinase. U0126, an MEK-specific inhibitor, abrogated M. avium-induced TNF-alpha secretion. Transfection of cells with dominant-negative MEK1 led to the suppression of TNF-alpha release in M. avium-challenged macrophages. M. avium activated p38 MAPK and use of the p38 MAPK inhibitor, SB203580, revealed that the p38 signaling pathway negatively regulates activation of ERK1/2 and release of TNF-alpha. Taken together, these results provide evidence that M. avium-induced TNF-alpha release from macrophages depends on an interplay between the ERK1/2 and the p38 MAPK signaling pathways.
Department of Chemistry, Bose Institute, 93/1 Acharya Prafulla Chandra Road, Kolkata 700 009, India.
Asima
A
Bhattacharyya
Shresh
S
Pathak
Manikuntala
M
Kundu
Joyoti
J
Basu
D000328:Adult; D000818:Animals; D004789:Enzyme Activation; D004791:Enzyme Inhibitors / Q000494:pharmacology; D006801:Humans; D066298:In Vitro Techniques; D048031:JNK Mitogen-Activated Protein Kinases; D048369:MAP Kinase Kinase 1; D008264:Macrophages / Q000187:drug effects / Q000201:enzymology* / Q000276:immunology / Q000382:microbiology*; D051379:Mice; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3; D020929:Mitogen-Activated Protein Kinase Kinases / Q000235:genetics; D020928:Mitogen-Activated Protein Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism*; D008954:Models, Biological; D015269:Mycobacterium avium Complex / Q000472:pathogenicity*; D017346:Protein Serine-Threonine Kinases / Q000235:genetics; D014162:Transfection; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism*; D048051:p38 Mitogen-Activated Protein Kinases
D004791:Enzyme Inhibitors; D014409:Tumor Necrosis Factor-alpha; D017346:Protein Serine-Threonine Kinases; D048031:JNK Mitogen-Activated Protein Kinases; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D020928:Mitogen-Activated Protein Kinases; D048051:p38 Mitogen-Activated Protein Kinases; D048369:MAP Kinase Kinase 1; C482125:MAP2K1 protein, human; C482127:Map2k1 protein, mouse; D020929:Mitogen-Activated Protein Kinase Kinases