Search results for "Cell Surface"

showing 10 items of 201 documents

Contribution of sponge genes to unravel the genome of the hypothetical ancestor of Metazoa (Urmetazoa)

2001

Recently the term Urmetazoa, as the hypothetical metazoan ancestor, was introduced to highlight the finding that all metazoan phyla including the Porifera (sponges) are derived from one common ancestor. Sponges as the evolutionarily oldest, still extant phylum, are provided with a complex network of structural and functional molecules. Analyses of sponge genomes from Demospongiae (Suberites domuncula and Geodia cydonium), Calcarea (Sycon raphanus) and Hexactinellida (Aphrocallistes vastus) have contributed also to the reconstruction of the evolutionary position of Metazoa with respect to Fungi. Furthermore, these analyses have provided evidence that the characteristic evolutionary novelties…

AnkyrinsMolecular Sequence DataReceptors Cell SurfaceEvolution MolecularGeneticsMelanogasterAnimalsHumansAmino Acid SequenceViridiplantaeSycon raphanusPhylogenyCaenorhabditis elegansGeneticsGenomeSequence Homology Amino AcidbiologyPhylumImmunityGeneral Medicinebiology.organism_classificationPoriferaSuberites domunculaSpongeGenesHomo sapiensGene
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Alternative pathway activation of T cells by binding of CD2 to its cell-surface ligand.

1987

Activation of resting T lymphocytes is initiated by the interaction of cell-surface receptors with their corresponding ligands. In addition to activation through the CD3 (T3)-Ti antigen-receptor complex1, recent experiments have demonstrated induction of T-cell proliferation through the CD2 (T11) molecule2–4, traditionally known as the erythrocyte(E)-receptor, through which T cells can bind red blood cells (RBC)5–7. This 'alternative pathway' of T-cell activation2 was observed in vitro in response to combinations of anti-CD2 monoclonal antibodies (mAbs) that bind to distinct epitopes of CD2, such as mAbs against T112 plus T113 (ref. 2). The physiological importance of this activation pathwa…

Antigens Differentiation T-LymphocyteMultidisciplinaryErythrocytesRosette FormationbiologyCD3T-LymphocytesDose-Response Relationship ImmunologicAntibodies MonoclonalLigandsLymphocyte ActivationMolecular biologyIn vitroCD2 moleculeEpitopeCell biologyCell surface receptorAntigens SurfaceAlternative complement pathwaybiology.proteinHumansIL-2 receptorReceptorNature
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Cloning and characterization of PRA1, a gene encoding a novel pH-regulated antigen of Candida albicans.

1998

ABSTRACT Candida albicans is an opportunistic fungal pathogen of humans. The cell wall of the organism defines the interface between the pathogen and host tissues and is likely to play an essential and pivotal role in the host-pathogen interaction. The components of the cell wall critical to this interaction are undefined. Immunoscreening of a lambda expression library with sera raised against mycelial cell walls of C. albicans was used to identify genes encoding cell surface proteins. One of the positive clones represented a candidal gene that was differentially expressed in response to changes in the pH of the culture medium. Maximal expression occurred at neutral pH, with no expression d…

Antigens FungalDNA ComplementaryMolecular Sequence DataReceptors Cell SurfaceMicrobiologyFungal ProteinsImmunoscreeningGene Expression Regulation FungalCandida albicansAmino Acid SequenceCloning MolecularCandida albicansMolecular BiologyGenePeptide sequencechemistry.chemical_classificationFungal proteinbiologyBase SequenceSequence Homology Amino AcidHydrogen-Ion Concentrationbiology.organism_classificationMolecular biologyCorpus albicansPhenotypeEukaryotic CellschemistryCell fractionationGlycoproteinJournal of bacteriology
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Folate-mediated targeting of polymeric conjugates of gemcitabine.

2005

The synthesis of two new macromolecular prodrugs for active tumor targeting was set up. Gemcitabine (2'-deoxy-2',2'-difluorocytidine) was conjugated to alpha,beta-poly(N-2-hydroxyethyl)-DL-aspartamide (PHEA) through succinyl or diglycolyl hydrolysable spacers. The targeting agent folic acid was attached to the macromolecular backbone through the aminocaproic spacer. The two conjugates [PHEA-(5'-succinylgemcitabine)-1'-carboxypentyl-folamide and PHEA-(5'-diglycolyl-gemcitabine)-1'-carboxypentyl-folamide], were purified and extensively characterised by spectroscopic (UV, IR and NMR) and chromatographic analyses to determine the correct chemical structure, the purity degree and the reaction yi…

Antimetabolites AntineoplasticTime FactorsStereochemistryCell SurvivalpolyaspartamideChemical structurePharmaceutical ScienceReceptors Cell SurfaceConjugated systemDeoxycytidineDrug Delivery SystemsFolic AcidCell Line Tumorfolate-mediated targetingExtracellularHumansProdrugsIncubationPolyhydroxyethyl MethacrylateDrug CarriersDose-Response Relationship DrugChemistrypolymeric conjugateFolate Receptors GPI-AnchoredSuccinatesHydrogen-Ion ConcentrationGemcitabineIn vitroBiochemistryCell cultureCarrier ProteinsMacromoleculeConjugateInternational journal of pharmaceutics
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Functional Role of Lipoprotein Receptors in Alzheimers Disease

2008

The LDL receptor gene family constitutes a class of structurally closely related cell surface receptors fulfilling diverse functions in different organs, tissues, and cell types. The LDL receptor is the prototype of this family, which also includes the VLDLR, ApoER2/LRP8, LRP1 and LRP1B, as well as Megalin/GP330, SorLA/LR11, LRP5, LRP6 and MEGF7. Recently several lines of evidence have positioned the LDL receptor gene family as one of the key players in Alzheimer's disease (AD) research. Initially this receptor family was of high interest due to its key function in cholesterol/apolipoprotein E (ApoE) uptake, with the epsilon4 allele of ApoE as the strongest genetic risk factor for late-onse…

Apolipoprotein EAmyloid beta-PeptidesbiologyChemistryEndosomeLRP1BLRP1Cell biologyAmyloid beta-Protein PrecursorApolipoproteins ECholesterolReceptors LDLNeurologyAlzheimer DiseaseCell surface receptormental disordersLDL receptorAmyloid precursor proteinbiology.proteinAnimalsHumansNeurology (clinical)ReceptorCurrent Alzheimer Research
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Pharmacological blockade of the fatty acid amide hydrolase (FAAH) alters neural proliferation, apoptosis and gliosis in the rat hippocampus, hypothal…

2015

Endocannabinoids participate in the control of neurogenesis, neural cell death and gliosis. The pharmacological effect of the fatty acid amide hydrolase (FAAH) inhibitor URB597, which limits the endocannabinoid degradation, was investigated in the present study. Cell proliferation (phospho-H3(+) or BrdU(+) cells) of the main adult neurogenic zones as well as apoptosis (cleaved caspase-3(+)), astroglia (GFAP(+)), and microglia (Iba1(+) cells) were analyzed in the hippocampus, hypothalamus and striatum of rats intraperitoneally treated with URB597 (0.3 mg/kg/day) at one dose/4-days resting or 5 doses (1 dose/day). Repeated URB597 treatment increased the plasma levels of the N-acylethanolamine…

AstrocitosNeurobiologia del desenvolupamentAmidohidrolasasCannabinoid receptorCarbamatos:Chemicals and Drugs::Amino Acids Peptides and Proteins::Proteins::Intracellular Signaling Peptides and Proteins::Apoptosis Regulatory Proteins::Caspases [Medical Subject Headings]:Phenomena and Processes::Cell Physiological Phenomena::Cell Physiological Processes::Cell Differentiation::Neurogenesis [Medical Subject Headings]medicine.medical_treatment:Chemicals and Drugs::Carbohydrates::Monosaccharides::Hexoses::Glucose [Medical Subject Headings]Apoptosis:Phenomena and Processes::Physiological Phenomena::Body Constitution::Body Weights and Measures::Body Size::Body Weight [Medical Subject Headings]chemistry.chemical_compound:Chemicals and Drugs::Amino Acids Peptides and Proteins::Proteins::Membrane Proteins::Receptors Cell Surface::Receptors G-Protein-Coupled::Receptors Cannabinoid::Receptor Cannabinoid CB1 [Medical Subject Headings]0302 clinical medicine:Chemicals and Drugs::Organic Chemicals::Carboxylic Acids::Acids Acyclic::Carbamates [Medical Subject Headings]Fatty acid amide hydrolaseReceptor cannabinoide CB1:Organisms::Eukaryota::Animals [Medical Subject Headings]FAAHGliosishealth care economics and organizations:Chemicals and Drugs::Nucleic Acids Nucleotides and Nucleosides::Nucleosides::Deoxyribonucleosides::Deoxyuridine::Bromodeoxyuridine [Medical Subject Headings]:Chemicals and Drugs::Lipids::Glycerides::Triglycerides [Medical Subject Headings]Original Research0303 health sciencesNeurogenesisBenzamidas:Chemicals and Drugs::Polycyclic Compounds::Steroids::Cholestanes::Cholestenes::Cholesterol [Medical Subject Headings]Endocannabinoid systemEtanolaminas3. Good healthEndocannabinoides:Chemicals and Drugs::Lipids::Fatty Acids::Fatty Acids Unsaturated::Fatty Acids Monounsaturated::Oleic Acids [Medical Subject Headings]CannabinoidesMicroglíalipids (amino acids peptides and proteins)medicine.symptomColesterol:Chemicals and Drugs::Organic Chemicals::Hydrocarbons::Terpenes::Cannabinoids [Medical Subject Headings]:Chemicals and Drugs::Lipids::Fatty Acids::Palmitic Acids [Medical Subject Headings]psychological phenomena and processesProliferación celularmedicine.medical_specialtyCerebroNeurogenesiseducationBiologyBromodesoxiuridina:Anatomy::Nervous System::Neuroglia::Microglia [Medical Subject Headings]Triglicéridoslcsh:RC321-571Ácidos oléicosRatas03 medical and health sciencesCellular and Molecular NeuroscienceInternal medicineHipocampomedicineCaspasa 3:Anatomy::Nervous System::Central Nervous System::Brain::Limbic System::Hippocampus [Medical Subject Headings]:Phenomena and Processes::Cell Physiological Phenomena::Cell Physiological Processes::Cell Growth Processes::Cell Proliferation [Medical Subject Headings]lcsh:Neurosciences. Biological psychiatry. Neuropsychiatry030304 developmental biologyPalmitoylethanolamide:Chemicals and Drugs::Chemical Actions and Uses::Pharmacologic Actions::Molecular Mechanisms of Pharmacological Action::Neurotransmitter Agents::Endocannabinoids [Medical Subject Headings]:Chemicals and Drugs::Enzymes and Coenzymes::Enzymes::Hydrolases::Amidohydrolases [Medical Subject Headings]Cannabinoids:Anatomy::Cells::Neuroglia::Astrocytes [Medical Subject Headings]Peso corporalEnergy metabolism:Anatomy::Nervous System::Central Nervous System::Brain [Medical Subject Headings]:Anatomy::Nervous System::Central Nervous System::Brain::Limbic System::Hypothalamus [Medical Subject Headings]URB597:Phenomena and Processes::Cell Physiological Phenomena::Cell Physiological Processes::Cell Death [Medical Subject Headings]:Diseases::Pathological Conditions Signs and Symptoms::Pathologic Processes::Gliosis [Medical Subject Headings]:Chemicals and Drugs::Organic Chemicals::Amines::Amino Alcohols::Ethanolamines [Medical Subject Headings]Muerte celular:Phenomena and Processes::Cell Physiological Phenomena::Cell Physiological Processes::Cell Death::Apoptosis [Medical Subject Headings]:Organisms::Eukaryota::Animals::Chordata::Vertebrates::Mammals::Rodentia::Muridae::Murinae::Rats [Medical Subject Headings]EndocrinologyURB597chemistryGliosisnervous systemGlucosaCannabinoidEnergy Metabolism:Chemicals and Drugs::Organic Chemicals::Amides::Benzamides [Medical Subject Headings]HipotálamoÁcidos palmíticos030217 neurology & neurosurgeryNeuroscienceFrontiers in Cellular Neuroscience
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Occurrence of a common binding site in Mamestra brassicae, Phthorimaea operculella, and Spodoptera exigua for the insecticidal crystal proteins CryIA…

1997

Specific binding to midgut membrane proteins is required for the toxicity of insecticidal crystal proteins (ICP) from Bacillus thuringiensis. A direct relationship between toxicity and binding has been proposed. It has been hypothesized that sharing of a single receptor by more than one ICP could lead to the occurrence of multiple resistance in the event of an alteration in the common receptor. Binding of CryIA(a), CryIA(b) and CryIA(c), three structurally related ICPs, has been studied in Phthorimaea operculella, Mamestra brassicae and, Spodoptera exigua using brush border membrane vesicles (BBMV) from the midgut tissue. Using iodinated CryIA(b), the three insects showed similar results: o…

Bacterial ToxinsBacillus thuringiensisReceptors Cell SurfaceSpodopteraMothsSpodopteraBiochemistryHemolysin ProteinsBacterial ProteinsBacillus thuringiensisExiguaBotanyAnimalsBinding siteReceptorMolecular BiologyBinding SitesbiologyBacillus thuringiensis ToxinsfungiMidgutbiology.organism_classificationMolecular biologyPhthorimaea operculellaEndotoxinsMembrane proteinInsect ScienceInsect ProteinsInsect biochemistry and molecular biology
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Common receptor for Bacillus thuringiensis toxins Cry1Ac, Cry1Fa, and Cry1Ja in Helicoverpa armigera, Helicoverpa zea and Spodoptera exigua

2005

ABSTRACT Binding studies using 125 I-Cry1Ac and biotinylated Cry1Fa toxins indicate the occurrence of a common receptor for Cry1Ac, Cry1Fa, and Cry1Ja in Helicoverpa armigera , Helicoverpa zea , and Spodoptera exigua . Our results, along with previous binding data and the observed cases of cross-resistance, suggest that this pattern seems to be widespread among lepidopteran species.

Bacterial ToxinsBiotecnologia agrícolaBacillus thuringiensisMicrobiologiaReceptors Cell SurfaceSpodopteraHelicoverpa armigeraSpodopteraBinding CompetitiveApplied Microbiology and BiotechnologyMicrobiologyLepidoptera genitaliaHemolysin ProteinsBacterial ProteinsBacillus thuringiensisExiguaBotanyInvertebrate MicrobiologyAnimalsBinding SitesBacillus thuringiensis ToxinsEcologybiologyfungibiology.organism_classificationEndotoxinsLepidopteraCry1AcInsect ProteinsNoctuidaeHelicoverpa zeaFood ScienceBiotechnology
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Vitamin C blocks inflammatory platelet-activating factor mimetics created by cigarette smoking.

1997

Cigarette smoking within minutes induces leukocyte adhesion to the vascular wall and formation of intravascular leukocyte-platelet aggregates. We find this is inhibited by platelet-activating factor (PAF) receptor antagonists, and correlates with the accumulation of PAF-like mediators in the blood of cigarette smoke-exposed hamsters. These mediators were PAF-like lipids, formed by nonenzymatic oxidative modification of existing phospholipids, that were distinct from biosynthetic PAF. These PAF-like lipids induced isolated human monocytes and platelets to aggregate, which greatly increased their secretion of IL-8 and macrophage inflammatory protein-1alpha. Both events were blocked by a PAF r…

Blood PlateletsChemokineAntioxidantTime FactorsPlatelet Aggregationmedicine.drug_classNeutrophilsmedicine.medical_treatmentPhospholipidReceptors Cell SurfaceAscorbic AcidPlatelet Membrane GlycoproteinsPharmacologyAntioxidantsMonocytesReceptors G-Protein-Coupledchemistry.chemical_compoundReference ValuesCricetinaemedicineCell AdhesionAnimalsHumansPlateletPlatelet Activating FactorReceptorChemokine CCL4Cell AggregationLeukocyte aggregationbiologyPlatelet-activating factorChemistryInterleukin-8SmokingGeneral MedicineAzepinesMacrophage Inflammatory ProteinsTriazolesReceptor antagonistBiochemistrybiology.proteinlipids (amino acids peptides and proteins)Platelet Aggregation InhibitorsResearch Article
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Lyophilization of lepidopteran midguts: a preserving method for Bacillus thuringiensis toxin binding studies

2004

Binding assays with brush border membrane vesicles (BBMV) from insect midguts are commonly used in the study of the interactions between Bacillus thuringiensis Cry toxins and their receptors. Collaboration between laboratories often require that frozen insect samples are sent in dry ice. Because of customs restrictions and delays, sample thawing is always a risk and often the biological material becomes ruined during shipping. We have tested lyophilization as an alternative method for preserving insect midguts for binding studies with B. thuringiensis Cry toxins. For this purpose, BBMV were prepared from both frozen and lyophilized midguts from three lepidopteran species: Spodoptera exigua,…

Brush borderBacillus thuringiensisReceptors Cell SurfaceHelicoverpa armigeraSpodopteramedicine.disease_causeHost-Parasite InteractionsMicrobiologyBacterial ProteinsBacillus thuringiensisExiguamedicineAnimalsBinding sitePest Control BiologicalEcology Evolution Behavior and SystematicsCryopreservationMicrovillibiologyToxinfungibiology.organism_classificationLepidopteraFreeze DryingBiochemistryManduca sextaInsect ProteinsDigestive SystemJournal of Invertebrate Pathology
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