0000000000669071

AUTHOR

Gavish Kumar

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Mycobacterial antigen(s) induce anergy by altering TCR- and TCR/CD28-induced signalling events: insights into T-cell unresponsiveness in leprosy.

2009

Present study investigates the role of Mycobacterium leprae (M. leprae) antigens on TCR- and TCR/CD28-induced signalling leading to T-cell activation and further correlates these early biochemical events with T-cell anergy, as prevailed in advanced stages of leprosy. We observed that both whole cell lystae (WCL) and soluble fraction of M. leprae sonicate (MLSA) not only inhibited TCR, thapsigargin and ionomycin induced calcium fluxes by diminishing the opening of calcium channels, but also TCR- or TCR/CD28-induced proximal signalling events like phosphorylation of Zap-70 and protein kinase-C (PKC) activity. Study of TCR- and TCR/CD28-induced downstream signals revealed that M. leprae antige…

Antigens Differentiation T-LymphocyteMAP Kinase Signaling SystemT cellT-LymphocytesImmunologyReceptors Antigen T-Cellchemical and pharmacologic phenomenaBiologyLymphocyte ActivationJurkat cellsp38 Mitogen-Activated Protein Kinaseschemistry.chemical_compoundJurkat CellsCD28 AntigensAntigens CDLeprosyCalcium fluxmedicineHumansLectins C-TypeEnzyme InhibitorsPromoter Regions GeneticMolecular BiologyMycobacterium lepraeProtein Kinase CCell ProliferationClonal AnergyAntigens BacterialMitogen-Activated Protein Kinase 3ZAP-70 Protein-Tyrosine KinaseIonophoresNFATC Transcription FactorsIonomycinT-cell receptorInterleukin-2 Receptor alpha SubunitCD28hemic and immune systemsNFATbiology.organism_classificationCell biologyMycobacterium lepraemedicine.anatomical_structurechemistryGene Expression RegulationIonomycinImmunologyInterleukin-2ThapsigarginCalciumMolecular immunology
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