6533b7d5fe1ef96bd1263e1f

RESEARCH PRODUCT

Dibutyryl cyclic AMP and adrenaline increase contractile force and 45Ca uptake in mammalian cardiac muscle

Hermann NawrathH. ScholzThomas Meinertz

subject

Calcium Isotopesmedicine.medical_specialtyContraction (grammar)Epinephrinechemistry.chemical_elementStimulationIn Vitro TechniquesCalciumInternal medicineCyclic AMPmedicineExtracellularAnimalsCa uptakeCardiac OutputPharmacologyMyocardiumCardiac muscleHeartGeneral MedicineDibutyryl Cyclic AMPRatsEndocrinologymedicine.anatomical_structurechemistryCalciumFemaleSpecific activity

description

The effects of dibutyryl cyclic AMP (DB-AMP; 10−3M) and adrenaline (2.2×10−6 M) on contractile force, 45Ca uptake, and total myocardial Ca concentration were investigated in electrically driven left auricles isolated from rat hearts. The experiments were performed at an extracellular Ca concentration of 0.45 mM and at low frequency of stimulation (15 beats/min). 45Ca exposure was 5 min. Under the conditions used, both drugs increased contractile force and enhanced 45Ca uptake (expressed as relative specific activity) by about 30% (DB-AMP) and 40% (adrenaline), respectively. Thus, the results provide evidence that the effects of adrenaline on 45Ca uptake in mammalian cardiac muscle can be mimicked by DB-AMP.

yearjournalcountryeditionlanguage
1973-01-01Naunyn-Schmiedeberg's Archives of Pharmacology
https://doi.org/10.1007/bf00498789