Search results for "ATF3"

showing 4 items of 4 documents

Polyoxypregnanes as safe, potent, and specific ABCB1-inhibitory pro-drugs to overcome multidrug resistance in cancer chemotherapy in vitro and in vivo

2021

Multidrug resistance (MDR) mediated by ATP binding cassette subfamily B member 1 (ABCB1) is significantly hindering effective cancer chemotherapy. However, currently, no ABCB1-inhibitory drugs have been approved to treat MDR cancer clinically, mainly due to the inhibitor specificity, toxicity, and drug interactions. Here, we reported that three polyoxypregnanes (POPs) as the most abundant constituents of Marsdenia tenacissima (M. tenacissima) were novel ABCB1-modulatory pro-drugs, which underwent intestinal microbiota-mediated biotransformation in vivo to generate active metabolites. The metabolites at non-toxic concentrations restored chemosensitivity in ABCB1-overexpressing cancer cells v…

ABCC1 ATP binding cassette subfamily C member 1IC50 half maximal inhibitory concentrationMultidrug resistancePharmacologyNADPH reduced nicotinamide adenine dinucleotide phosphateF bioavailabilitychemistry.chemical_compoundPCR polymerase chain reaction0302 clinical medicineMDR multidrug resistanceECL electrochemiluminescencet1/2 elimination half-lifeLC–MS liquid chromatography coupled with mass spectrometryN.D. not detectedGeneral Pharmacology Toxicology and PharmaceuticsBBB blood–brain barriermedia_commonATF3 activating transcription factor 30303 health sciencesChemistryABC ATP-binding cassetteNMPA National Medical Products AdministrationPXR pregnane X receptorSDS-PAGE sodium dodecyl sulfate-polyacrylamide gel electrophoresisHBSS Hankʹs balanced salt solutionABCB1Combination chemotherapyProdrugMarsdenia tenacissimaCmax peak concentrationPaclitaxelGAPDH glyceraldehyde-3-phosphate dehydrogenase030220 oncology & carcinogenesisBHI brain heart infusionOriginal ArticleAUC0–∞ area under plasma concentration vs. time curveMRT mean residence timeDrugmedia_common.quotation_subjectRM1-950Vd volume of distributionABCB1 ATP binding cassette subfamily B member 1UIC-2 mouse monoclonal ABCB1 antibodyABCG2 ATP binding cassette subfamily G member 2Combination chemotherapyCYP cytochrome P450 isozymePI propidium iodideTEER transepithelial electrical resistance03 medical and health sciencesPBS phosphate buffer salineFBS fetal bovine serumDox doxorubicinIn vivoPOP polyoxypregnanemedicine030304 developmental biologyEVOM epithelial tissue voltohmmeterTmax time for peak concentrationCancerLBE lowest binding energyPE phycoerythrinmedicine.diseaseMultiple drug resistancePolyoxypregnanePapp apparent permeabilityN.A. not applicableCancer cellH&E hematoxylin and eosinMDR1a multidrug resistance protein 1aTherapeutics. PharmacologyqPCR quantitative PCRM. tenacissima Marsdenia tenacissimaCL clearanceSD standard derivationActa Pharmaceutica Sinica B
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A novel tumour associated leucine zipper protein targeting to sites of gene transcription and splicing

2002

We describe here the definition and characterization of antigen CT-8/HOM-TES-85 encoded by a previously unknown gene and identified by serological expression screening using antibodies from a seminoma patient. Intriguingly, the leucine zipper region of CT-8/HOM-TES-85 shows an atypical amphipathy with clusters of hydrophobic residues that is exclusively shared by the N-myc proto-oncogene. CT-8/HOM-TES-85 gene is tightly silenced in normal tissues except for testis. However, it is frequently activated in human neoplasms of different types including lung cancer, ovarian cancer, melanoma and glioma. Endogenous as well as heterogeneously expressed CT-8/HOM-TES-85 targets predominantly to the nu…

Cancer ResearchLeucine zipperDNA ComplementaryTranscription GeneticGreen Fluorescent ProteinsImmunoblottingBiologymedicine.disease_causeModels BiologicalProto-Oncogene MasAntigens NeoplasmTranscription (biology)Protein targetingTumor Cells CulturedGeneticsmedicineHumansTissue DistributionAntigensMolecular BiologyGeneLeucine ZippersATF3GenomeReverse Transcriptase Polymerase Chain ReactionAlternative splicingfood and beveragesBlotting NorthernPhenotypeProtein Structure TertiaryDNA-Binding ProteinsAlternative SplicingLuminescent ProteinsPhenotypeMicroscopy FluorescenceModels ChemicalRNA splicingCancer researchOncogene
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The designer cytokine hyper-interleukin-6 is a potent activator of STAT3-dependent gene transcription in vivo and in vitro.

1999

Interleukin-6 (IL-6) triggers pivotal pathways in vivo. The designer protein hyper-IL-6 (H-IL-6) fuses the soluble IL-6 receptor (sIL-6R) through an intermediate linker with IL-6. The intracellular pathways that are triggered by H-IL-6 are not defined yet. Therefore, we studied the molecular mechanisms leading to H-IL-6-dependent gene activation. H-IL-6 stimulates haptoglobin mRNA expression in HepG2 cells, which is transcriptionally mediated as assessed by run-off experiments. The increase in haptoglobin gene transcription correlates with higher nuclear translocation of tyrosine-phosphorylated STAT3 and its DNA binding. As H-IL-6 stimulates STAT3-dependent gene transcription, we compared t…

Therapeutic gene modulationSTAT3 Transcription FactorTranscriptional ActivationTranscription GeneticRecombinant Fusion ProteinsResponse elementE-boxBiologyTransfectionBiochemistryCell LineMiceSp3 transcription factorAntigens CDCytokine Receptor gp130E2F1AnimalsHumansRNA MessengerPhosphorylationMolecular BiologyCell NucleusATF3Sp1 transcription factorMice Inbred C3HMembrane GlycoproteinsHaptoglobinsInterleukin-6Liver receptor homolog-1Biological TransportCell BiologyDNAReceptors InterleukinMolecular biologyReceptors Interleukin-6DNA-Binding ProteinsGene Expression RegulationTrans-ActivatorsTyrosineThe Journal of biological chemistry
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Host-Derived CD8+ Dendritic Cells Protect Against Acute Graft-versus-Host Disease after Experimental Allogeneic Bone Marrow Transplantation

2014

Graft-versus-host disease (GVHD) is a frequent life-threatening complication after allogeneic hematopoietic stem cell transplantation (HSCT) and induced by donor-derived T cells that become activated by host antigen-presenting cells. To address the relevance of host dendritic cell (DC) populations in this disease, we used mouse strains deficient in CD11c(+) or CD8α(+) DC populations in a model of acute GVHD where bone marrow and T cells from BALB/c donors were transplanted into C57BL/6 hosts. Surprisingly, a strong increase in GVHD-related mortality was observed in the absence of CD11c(+) cells. Likewise, Batf3-deficient (Batf3(-/-)) mice that lack CD8α(+) DCs also displayed a strongly incr…

medicine.medical_treatmentGraft vs Host DiseasePriming (immunology)CD11cHematopoietic stem cell transplantationchemical and pharmacologic phenomenaHematopoietic stem cell transplantationCD8-Positive T-LymphocytesBiologyGraft-versus-host diseaseDendritic cellsMiceimmune system diseasesBATF3medicineAnimalsTransplantation HomologousBone Marrow TransplantationMice Inbred BALB CTransplantationPeripheral toleranceHematologyDendritic cellmedicine.diseaseMice Inbred C57BLsurgical procedures operativeGraft-versus-host diseasemedicine.anatomical_structureImmunologyBone marrowCD8Biology of Blood and Marrow Transplantation
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