Search results for " gamma-delta"

showing 10 items of 86 documents

Challenges and new prospects in hepatosplenic γδ T-cell lymphoma.

2014

Peripheral T-cell lymphomas (PTCLs) are a heterogeneous group of lymphoid neoplasms characterized by aggressive clinical behavior and dismal prognosis. Hepatosplenic γδ T-cell lymphoma (γδ-HSTL) is a particular form of PTCL that arises from a small subset of γ/δ T-cell receptor-expressing lymphocytes. γδ-HSTL has a rapidly progressive course and poor outcome due also to its refractoriness to conventional chemotherapy regimens. The very low incidence of γδ-HSTL, along with its propensity to mimic different pathological entities, makes this lymphoma a true diagnostic challenge. In this review, we highlight the biological and clinical features of γδ-HSTL that contribute to making this lymphoma…

Cancer ResearchHepatosplenic T-cell lymphomaSpleenDiseaseBiologyT cell lymphomaAntineoplastic Combined Chemotherapy ProtocolsmedicineHumansT-cell lymphomaPathologicalgamma delta T cell lymphomahepatosplenic T cell lymphomaSplenic NeoplasmsLiver NeoplasmsLymphoma T-Cell PeripheralReceptors Antigen T-Cell gamma-deltaHematologymedicine.diseaseCombined Modality Therapyperipheral T cell lymphomasLymphomaT cell lymphoma; gamma delta T cell lymphomas; hepatosplenic T cell lymphoma; peripheral T cell lymphomasTreatment Outcomemedicine.anatomical_structureOncologyImmunologyConventional chemotherapyBone marrowStem Cell Transplantation
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Stimulation of synovial fluid mononuclear cells with the human 65-kD heat shock protein or with live enterobacteria leads to preferential expansion o…

1992

SUMMARY T lymphocyte responses to heterologous or self 65-kD heat shock protein (hsp) have been implicated in the pathogenesis of various forms of arthritis. To delineate the relationship of 65-kD hsp to different synovial fluid (SF) T cell subsets, we stimulated synovial fluid (SFMC) and peripheral blood mononuclear cells (PBMC) from patients with different inflammatory rheumatic diseases and from healthy controls with human or mycobacterial 65-kD hsp, tetanus toxoid (TT), heat-killed or live Yersinia enterocotitica. Phenotyping of the resulting T cell lines revealed an increase of up to 97% TCR-γδ+ lymphocytes in the 65-kD hsp-stimulatcd SF-derived lines. This expansion of TCR-γδ+ cells w…

Cellular immunityT cellReceptors Antigen T-Cell alpha-betaT-LymphocytesImmunologyBiologyYersiniaLymphocyte ActivationPeripheral blood mononuclear cellMonocytesCell LineAntigenEnterobacteriaceaeHeat shock proteinSynovial FluidmedicineImmunology and AllergySynovial fluidHumansHeat-Shock ProteinsReceptors Antigen T-Cell gamma-deltaT lymphocytebiology.organism_classificationClone Cellsmedicine.anatomical_structurePhenotypeImmunologyResearch Article
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Chemotherapy Sensitizes Colon Cancer Initiating Cells to Vγ9Vδ2 T Cell-Mediated Cytotoxicity

2013

Colon cancer comprises a small population of cancer initiating stem cells (CIC) that is responsible for tumor maintenance and resistance to anti-cancer therapies, possibly allowing for tumor recapitulation once treatment stops. Combinations of immune-based therapies with chemotherapy and other anti-tumor agents may be of significant clinical benefit in the treatment of colon cancer. However, cellular immune-based therapies have not been experimented yet in the population of colon CICs. Here, we demonstrate that treatment with low concentrations of commonly used chemotherapeutic agents, 5- fluorouracyl and doxorubicin, sensitize colon CICs to Vc9Vd2 T cell cytotoxicity. Vc9Vd2 T cell cytotox…

Cytotoxicity ImmunologicColorectal cancermedicine.medical_treatmentCancer TreatmentGene ExpressionPharmacologyTNF-Related Apoptosis-Inducing LigandCancer immunotherapyBasic Cancer ResearchImmune Responseeducation.field_of_studyMultidisciplinaryT CellsQColon AdenocarcinomaRReceptors Antigen T-Cell gamma-deltamedicine.anatomical_structureOncologyNK Cell Lectin-Like Receptor Subfamily KColonic NeoplasmsNeoplastic Stem CellsMedicineFluorouracilImmunotherapyResearch ArticleTumor ImmunologyImmune CellsScienceT cellPrimary Cell CultureImmunologyPopulationAntineoplastic AgentsAdenocarcinomaBiologyCell LineImmune systemGastrointestinal TumorsmedicineHumanseducationBiologyImmune EvasionImmunityCancers and NeoplasmsCancerImmunotherapyImmunologic Subspecialtiesmedicine.diseaseCoculture TechniquesReceptors TNF-Related Apoptosis-Inducing LigandDoxorubicinCancer researchClinical ImmunologyT cell mediated cytotoxicityT-Lymphocytes CytotoxicDR5 c9Vd2PLoS ONE
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γδ T cells as a potential tool in colon cancer immunotherapy

2014

γδ T cells are capable of recognizing tumor cells and exert potent cellular cytotoxicity against a large range of tumors, including colon cancer. However, tumors utilize numerous strategies to escape recognition or killing by patrolling γδ T cells, such a downregulation of NKG2D ligands, MICA/B and ULBPs. Therefore, the combined upregulation of T-cell receptorand NKG2D ligands on tumor cells and induction of NKG2D expression on γδ T cells may greatly enhance tumor killing and unlock the functions of γδ T cells. Here, we briefly review current data on the mechanisms of γδ T-cell recognition and killing of colon cancer cells and propose that γδ T cells may represent a promising target for the…

Cytotoxicity ImmunologicColorectal cancermedicine.medical_treatmentImmunologyNkg2d ligandsLarge rangeLigandsDownregulation and upregulationT-Lymphocyte SubsetsmedicineHumansImmunology and AllergyIn patientCell-mediated cytotoxicitybusiness.industryReceptors Antigen T-Cell gamma-deltaImmunotherapymedicine.diseaseNKG2Dgamma delta cellcolon cancerOncologyColonic NeoplasmsImmunologyNeoplastic Stem CellsImmunotherapybusinessImmunotherapy
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Efficient killing of human colon cancer stem cells by gammadelta T lymphocytes

2009

Colon cancer comprises a small population of cancer stem cells (CSC) that is responsible for tumor maintenance and resistant to cancer therapies, possibly allowing for tumor recapitulation once treatment stops. We previously demonstrated that such chemoresistance is mediated by autocrine production of IL-4 through the up-regulation of antiapoptotic proteins. Several innate and adaptive immune effector cells allow for the recognition and destruction of cancer precursors before they constitute the tumor mass. However, cellular immune-based therapies have not been experimented yet in the population of CSCs. Here, we show that the bisphosphonate zoledronate sensitizes colon CSCs to Vgamma9Vdelt…

Cytotoxicity ImmunologicDiphosphonatesTerpenesT-LymphocytesImidazolesReceptors Antigen T-Cell gamma-deltaZoledronic AcidColon cancer stem cells gamma delta T cellsNK Cell Lectin-Like Receptor Subfamily KColonic NeoplasmsNeoplastic Stem CellsCytokinesHumansChromaffin GranulesImmunotherapy
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γδ T cell-based anticancer immunotherapy: Progress and possibilities

2015

Cytotoxicity Immunologicmedicine.medical_treatmentT cellT-LymphocytesImmunologyImmunotherapy AdoptiveInterferon-gammaNeoplasmsTumor MicroenvironmentImmunology and AllergyMedicineAnimalsHumansSettore MED/04 - Patologia GeneraleTumor microenvironmentTumor-infiltrating lymphocytesbusiness.industryInterleukin-17Neoplasms therapyReceptors Antigen T-Cell gamma-deltaImmunotherapymedicine.anatomical_structureγδ T cells • cancer • IFN-γ • IL-17 • immunotherapy • PD-1 • tumor-infiltrating lymphocytesOncologyImmunologySettore MED/46 - Scienze Tecniche Di Medicina Di Laboratoriobusiness
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Exosomes released by chronic myelogenous leukemia cells modulate gamma-delta T cell activities

2013

Exosomes gamma-delta T cells
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HCV-induced immune responses influence the development of operational tolerance after liver transplantation in humans.

2014

Pathogen-induced immune responses prevent the establishment of transplantation tolerance in experimental animal models. Whether this occurs in humans as well remains unclear. The development of operational tolerance in liver transplant recipients with chronic hepatitis C virus (HCV) infection allows us to address this question. We conducted a clinical trial of immunosuppression withdrawal in HCV-infected adult liver recipients to elucidate (i) the mechanisms through which allograft tolerance can be established in the presence of an ongoing inflammatory response and (ii) whether anti-HCV heterologous immune responses influence this phenomenon. Of 34 enrolled liver recipients, drug withdrawal…

Graft RejectionMaleHepatitis C virusT cellmedicine.medical_treatmentHepacivirusLiver transplantationCD8-Positive T-Lymphocytesmedicine.disease_causeImmune systemInterferonmedicineImmune ToleranceHumansLymphocyte CountImmunosuppression Therapybusiness.industryImmunityImmunosuppressionReceptors Antigen T-Cell gamma-deltaGeneral MedicineMiddle Agedmedicine.diseaseLiver TransplantationTransplantationmedicine.anatomical_structureGene Expression RegulationImmunologyInterferon Type IFemaleViral hepatitisbusinessBiomarkersmedicine.drugScience translational medicine
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Gamma-delta T-cell lymphomas.

2009

Peripheral T-cell lymphomas (TCLs) are uncommon neoplasms, accounting for about 12% of all lymphoid tumors worldwide. TCLs in which gammadelta T-cell receptors are expressed (gammadelta TCLs) are extremely aggressive and rare (<1% of lymphoid neoplasms). gammadelta TCLs originate from gammadelta T cells, a small subset of peripheral T cells with direct antigen recognition capability acting at the interface between innate and adaptive immunity. Two distinct gammadelta TCL entities are recognized: hepatosplenic T-cell lymphoma (HSTL) and primary cutaneous gammadelta T-cell lymphoma (PCGD-TCL). HSTL is a well-characterized extranodal lymphoma that has a disguised onset, secondary to intrasinus…

Hepatosplenic T-cell lymphomaT cellGene Rearrangement delta-Chain T-Cell Antigen Receptorchemical and pharmacologic phenomenaprimary cutaneous gamma delta T-cell lymphomaImmune systemmedicineHumansGamma delta T cellLymphoma T-Cell CutaneouClinical Trials as Topicbusiness.industryGene Rearrangement gamma-Chain T-Cell Antigen Receptorgamma delta T-cell receptorMedicine (all)Peripheral T-cell lymphomaLymphoma T-Cell PeripheralReceptors Antigen T-Cell gamma-deltaGene rearrangementmedicine.diseaseAcquired immune systemLymphomaLymphoma T-Cell Cutaneousstomatognathic diseasesmedicine.anatomical_structurehepatosplenic T-cell lymphomaOncologyImmunologyBone marrowbusinessHuman
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γδT cells elicited by CMV reactivation after allo-SCT cross-recognize CMV and leukemia.

2013

Human cytomegalovirus (CMV) infections and relapse of disease remain major problems after allogeneic stem cell transplantation (allo-SCT), in particular in combination with CMV-negative donors or cordblood transplantations. Recent data suggest a paradoxical association between CMV reactivation after allo-SCT and reduced leukemic relapse. Given the potential of Vδ2-negative γδT cells to recognize CMV-infected cells and tumor cells, the molecular biology of distinct γδT-cell subsets expanding during CMV reactivation after allo-SCT was investigated. Vδ2(neg) γδT-cell expansions after CMV reactivation were observed not only with conventional but also cordblood donors. Expanded γδT cells were ca…

Human cytomegalovirusCancer ResearchAdoptive cell transferT cellT-LymphocytesCytomegalovirusBiologyAntigenT-Lymphocyte SubsetsmedicineHomologous chromosomeHumansTransplantation HomologousLeukemiavirus diseasesReceptors Antigen T-Cell gamma-deltaHematologymedicine.diseaseTransplantationLeukemiamedicine.anatomical_structureOncologyImmunologyVirus ActivationStem cellStem Cell TransplantationLeukemia
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