0000000000669073

AUTHOR

Pradeep K. Dagur

showing 2 related works from this author

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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Phenolic-glycolipid-1 and lipoarabinomannan preferentially modulate TCR- and CD28-triggered proximal biochemical events, leading to T-cell unresponsi…

2012

Abstract Background Advanced stages of leprosy show T cell unresponsiveness and lipids of mycobacterial origin are speculated to modulate immune responses in these patients. Present study elucidates the role of phenolicglycolipid (PGL-1) and Mannose-capped lipoarabinomannan (Man-LAM) on TCR- and TCR/CD28- mediated signalling. Results We observed that lipid antigens significantly inhibit proximal early signalling events like Zap-70 phosphorylation and calcium mobilization. Interestingly, these antigens preferentially curtailed TCR-triggered early downstream signalling events like p38 phosphorylation whereas potentiated that of Erk1/2. Further, at later stages inhibition of NFAT binding, IL-2…

LipopolysaccharidesEndocrinology Diabetes and MetabolismT-LymphocytesClinical BiochemistryPGL-1Man-LAMGene ExpressionLymphocyte ActivationJurkat cellsJurkat CellsEndocrinologyT-cell activationIL-2 receptorPhosphorylationExtracellular Signal-Regulated MAP KinasesPromoter Regions Geneticlcsh:RC620-627Protein Kinase CImmunity CellularZAP-70 Protein-Tyrosine KinaseCD28hemic and immune systemsCell biologyMycobacterium lepraelcsh:Nutritional diseases. Deficiency diseasesmedicine.anatomical_structureHost-Pathogen InteractionsProtein BindingMAP Kinase Signaling SystemT cellReceptors Antigen T-Cellchemical and pharmacologic phenomenaBiologyImmune systemCD28 AntigensLeprosymedicineHumansSecretionCalcium SignalingCell ProliferationBiochemistry medicalAntigens BacterialLipoarabinomannanNFATC Transcription FactorsResearchBiochemistry (medical)T-cell receptorInterleukin-2 Receptor alpha SubunitMycobacteriaGene Expression RegulationAnergyImmunologyLeukocytes MononuclearInterleukin-2GlycolipidsLipids in Health and Disease
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