Tarun Tyagi, PhD
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Associate Research Scientist
Biography
Dr Tyagi is interested in translational biomedical research. He is exploring the molecular basis of platelet mediated events in various pathophysiological states including solid tumors. He has developed interest in platelet-T cell crosstalk mechanisms and recently identified a novel platelet dependent T cell regulatory mechanism.
He has studied human and rodent platelets and T cells using a range of methods. Besides this, he has also studied the intricacies of platelet biology in cardiovascular disorders. In past, for his PhD in Life Science, Dr Tyagi studied platelet proteome for its role in hypoxia induced thrombosis.
Appointments
Cardiovascular Medicine
Associate Research ScientistPrimary
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Research
Publications
Featured Publications
Platelet-derived TLT-1 promotes tumor progression by suppressing CD8+ T cells
Tyagi T, Jain K, Yarovinsky TO, Chiorazzi M, Du J, Castro C, Griffin J, Korde A, Martin KA, Takyar SS, Flavell RA, Patel AA, Hwa J. Platelet-derived TLT-1 promotes tumor progression by suppressing CD8+ T cells. Journal Of Experimental Medicine 2022, 220: e20212218. PMID: 36305874, PMCID: PMC9814191, DOI: 10.1084/jem.20212218.Peer-Reviewed Original ResearchConceptsCD8 T cellsT cellsTLT-1Non-small cell lung cancer patientsCell lung cancer patientsTREM-like transcript-1Tumor immunosuppressive mechanismsT cell suppressionLung cancer patientsPatient T cellsNF-κB pathwayPatient-derived tumorsDistinct activation phenotypesNSCLC patientsImmunosuppressive mechanismsSyngeneic tumorsHumanized miceImmunoregulatory rolePrognostic significanceImmunocompetent miceCancer patientsCell suppressionActivation phenotypeReduced tumorTumor growthAltered expression of platelet proteins and calpain activity mediate hypoxia-induced prothrombotic phenotype
Tyagi T, Ahmad S, Gupta N, Sahu A, Ahmad Y, Nair V, Chatterjee T, Bajaj N, Sengupta S, Ganju L, Singh SB, Ashraf MZ. Altered expression of platelet proteins and calpain activity mediate hypoxia-induced prothrombotic phenotype. Blood 2013, 123: 1250-1260. PMID: 24297866, DOI: 10.1182/blood-2013-05-501924.Peer-Reviewed Original ResearchConceptsCalpain activityPlatelet reactivityProthrombotic phenotypeThrombus formationSoluble P-selectin levelsIncidence of thrombosisP-selectin levelsProthrombotic rolePlatelet hyperreactivitySolid tumorsVivo modelSmall subunit 1ThrombosisPathological conditionsAltered expressionHypoxic conditionsHypoxic environmentPlatelet proteinsHypoxiaExtreme altitudePresent studyCalpain functionPlateletsSubunit 1PhenotypeA guide to molecular and functional investigations of platelets to bridge basic and clinical sciences
Tyagi T, Jain K, Gu S, Qiu M, Gu V, Melchinger H, Rinder H, Martin K, Gardiner E, Lee A, Tang W, Hwa J. A guide to molecular and functional investigations of platelets to bridge basic and clinical sciences. Nature Cardiovascular Research 2022, 1: 223-237. PMID: 37502132, PMCID: PMC10373053, DOI: 10.1038/s44161-022-00021-z.Peer-Reviewed Reviews, Practice Guidelines, Standards, and Consensus StatementsVascular smooth muscle cellsPlatelet functional assaysCoronavirus disease 2019Smooth muscle cellsImmune cellsImmune regulationVascular remodelingDisease 2019Pathophysiological processesTranslational relevancePatient diagnosisFlow cytometryMuscle cellsPlatelet biologyFunctional assaysPlatelet investigationsHomeostatic processesPlateletsPhenotypic heterogeneityFunctional stateClinical scienceCellsAdditional roleThrombosisSuch diverse functions
2024
Platelet Mitochondrial Fusion and Function in Vascular Integrity
Tyagi T, Yarovinsky T, Faustino E, Hwa J. Platelet Mitochondrial Fusion and Function in Vascular Integrity. Circulation Research 2024, 134: 162-164. PMID: 38236952, PMCID: PMC10798220, DOI: 10.1161/circresaha.123.323867.Peer-Reviewed Original Research
2023
Lipid remodeling in megakaryocyte differentiation and platelet biogenesis
Jain K, Tyagi T, Hwa J. Lipid remodeling in megakaryocyte differentiation and platelet biogenesis. Nature Cardiovascular Research 2023, 2: 803-804. PMID: 37736249, PMCID: PMC10512809, DOI: 10.1038/s44161-023-00324-9.Peer-Reviewed Original Research
2022
Platelet in thrombo-inflammation: Unraveling new therapeutic targets
Sharma S, Tyagi T, Antoniak S. Platelet in thrombo-inflammation: Unraveling new therapeutic targets. Frontiers In Immunology 2022, 13: 1039843. PMID: 36451834, PMCID: PMC9702553, DOI: 10.3389/fimmu.2022.1039843.Peer-Reviewed Original ResearchConceptsRole of plateletsViral infectionPlatelet activationCoagulation pathwayThrombo-inflammatory disordersAcute ischemic strokeContribution of plateletsAnti-inflammatory potentialThrombo-inflammatory diseasesCoronavirus disease 2019Sickle cell diseaseNon-pathologic conditionsNew therapeutic targetsRecruitment of leukocytesPathologic platelet activationPlatelet surface receptorsFormation of thrombiInitial platelet activationSuperficial thrombophlebitisAntiphospholipid syndromeIschemic strokeMicrovascular thrombosisClinical manifestationsInflammatory processCell diseaseUnfolded Protein Response Differentially Modulates the Platelet Phenotype
Jain K, Tyagi T, Du J, Hu X, Patell K, Martin KA, Hwa J. Unfolded Protein Response Differentially Modulates the Platelet Phenotype. Circulation Research 2022, 131: 290-307. PMID: 35862006, PMCID: PMC9357223, DOI: 10.1161/circresaha.121.320530.Peer-Reviewed Original ResearchConceptsUPR pathwayProtein responseMouse plateletsUnfolded protein responseActivation of UPRPlatelet phenotypeTranscriptional regulationGenomic regulationProtein misfoldingAnucleate plateletsProtein aggregationUPR activationPhosphorylation of PLCγ2Chemical chaperonesXBP1 pathwayP38 MAPKPERK pathwayUPRPKCδ activationPlatelet physiologyActivation pathwayPathwayPhenotypeIRE1α inhibitionSelective induction
2020
Thrombocytopathy and endotheliopathy: crucial contributors to COVID-19 thromboinflammation
Gu SX, Tyagi T, Jain K, Gu VW, Lee SH, Hwa JM, Kwan JM, Krause DS, Lee AI, Halene S, Martin KA, Chun HJ, Hwa J. Thrombocytopathy and endotheliopathy: crucial contributors to COVID-19 thromboinflammation. Nature Reviews Cardiology 2020, 18: 194-209. PMID: 33214651, PMCID: PMC7675396, DOI: 10.1038/s41569-020-00469-1.Peer-Reviewed Reviews, Practice Guidelines, Standards, and Consensus StatementsMeSH KeywordsAdministration, InhalationAnticoagulantsBlood Coagulation DisordersBlood Platelet DisordersCOVID-19COVID-19 Drug TreatmentEndothelium, VascularEndothelium-Dependent Relaxing FactorsEpoprostenolHeart Disease Risk FactorsHumansIloprostInflammationNitric OxidePlatelet Aggregation InhibitorsSARS-CoV-2Systemic Inflammatory Response SyndromeThrombosisThrombotic MicroangiopathiesVascular DiseasesVasodilator AgentsVenous ThromboembolismConceptsCardiovascular risk factorsRisk factorsCOVID-19Severe acute respiratory syndrome coronavirus 2Pre-existing cardiovascular diseaseAcute respiratory syndrome coronavirus 2Traditional cardiovascular risk factorsAcute respiratory distress syndromeRespiratory syndrome coronavirus 2Respiratory distress syndromeManagement of patientsSyndrome coronavirus 2COVID-19 pathologyCoronavirus disease 2019Potential therapeutic strategyCytokine stormEndothelial dysfunctionThrombotic complicationsDistress syndromeExcessive inflammationCoronavirus 2Severe outcomesAdvanced ageCardiovascular diseaseDisease 2019“CO”ping With a Sticky Situation
Jain K, Tyagi T, Hwa J. “CO”ping With a Sticky Situation. Arteriosclerosis Thrombosis And Vascular Biology 2020, 40: 2344-2345. PMID: 32966131, PMCID: PMC7517721, DOI: 10.1161/atvbaha.120.315158.Commentaries, Editorials and Letters
2019
Venous thrombosis at altitude presents with distinct biochemical profiles: a comparative study from the Himalayas to the plains
Prabhakar A, Chatterjee T, Bajaj N, Tyagi T, Sahu A, Gupta N, Kumari B, Nair V, Kumar B, Ashraf MZ. Venous thrombosis at altitude presents with distinct biochemical profiles: a comparative study from the Himalayas to the plains. Blood Advances 2019, 3: 3713-3723. PMID: 31765479, PMCID: PMC6880906, DOI: 10.1182/bloodadvances.2018024554.Peer-Reviewed Original ResearchConceptsVenous thromboembolismAdhesion molecule-1VTE patientsHA exposureMolecule-1Vascular cell adhesion molecule-1Toll-like receptor 2Intracellular adhesion molecule-1Receiver operator characteristic curve analysisCell adhesion molecule-1Operator characteristic curve analysisMost VTEElevated platelet countVascular endothelial growth factorCharacteristic curve analysisYounger age groupsPlatelet factor 4Endothelial growth factorDistinct biochemical profilesVon Willebrand factorAltered coagulationVTE eventsVenous thrombosisEndothelial activationPlatelet count
Links & Media
Media
Activated Platelets
Adhered and activated human platelets imaged by Confocal Microcope at Yale.
News
- June 17, 2024
Dr. Tarun Tyagi Receives 2024 JH Milstone Award in Hematology
- October 16, 2023
Recap & Reflections: the Chalk Talk event
- March 30, 2023
Tyagi Selected for SITC Spring Scientific Abstract Award
- March 20, 2023
Unfolded Protein Response in Platelets and Diabetes