Search results for "Phosphodiesterases"

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Histamine up-regulates phosphodiesterase 4 activity and reduces prostaglandin E2-inhibitory effects in human neutrophils.

2000

Objective: To investigate whether histamine produces up-regulation of phosphodiesterase (PDE) activity with functional consequences in human peripheral blood neutrophils.¶Methods: PDE activity was studied by a radioisotopic method following anion-exchange chromatography. Reverse transcriptase-polymerase chain reaction (RT-PCR) was used for detection of mRNA transcripts of PDE4 subtypes. Cyclic AMP (cAMP) levels were measured by enzyme-immunoassay, and superoxide generation by cytochrome c reduction.¶Treatment: Neutrophils were incubated for 4 h with histamine (1 μM).¶Results: PDE4 was the only isoenzyme activity increased in treated neutrophils. Kinetic analysis showed a ∼1.5-fold increase …

medicine.medical_specialtyTranscription GeneticNeutrophilsImmunologyHeterologousBiologyDinoprostoneNeutrophil Activationchemistry.chemical_compoundPDE4BSuperoxidesInternal medicinemedicineCyclic AMPHumansProtein IsoformsRNA MessengerProstaglandin E2PharmacologyMessenger RNASuperoxideCytochrome cZymosanPhosphodiesteraseOpsonin ProteinsMolecular biologyCyclic Nucleotide Phosphodiesterases Type 4KineticsEndocrinologychemistry3'5'-Cyclic-AMP Phosphodiesterasesbiology.proteinHistaminemedicine.drugHistamineInflammation research : official journal of the European Histamine Research Society ... [et al.]
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