Slow calcium channel blockers and calmodulin. Effect of felodipine, nifedipine, prenylamine and bepridil on cardiac sarcolemmal calcium pumping ATPase.

Article Details

Citation

Lamers JM, Cysouw KJ, Verdouw PD

Slow calcium channel blockers and calmodulin. Effect of felodipine, nifedipine, prenylamine and bepridil on cardiac sarcolemmal calcium pumping ATPase.

Biochem Pharmacol. 1985 Nov 1;34(21):3837-43.

PubMed ID
2933041 [ View in PubMed
]
Abstract

The effect of four slow Ca2+ channel blockers (felodipine, nifedipine, prenylamine and bepridil) that possess the ability to bind to calmodulin (CaM) section and to inhibit myosin light chain kinase (MLCK) on CaM-regulated Ca2+ pumping ATPase of cardiac sarcolemma (SL) and brain cyclic AMP phosphodiesterase (PDE) was studied. The ability of these drugs to inhibit Ca2+ pumping ATPase correlated with their inhibitory effect on CaM-activated Ca2+-dependent PDE. Nifedipine was unable to inhibit markedly both enzymes. Prenylamine also was a weak inhibitor, which was unexpected because of its CaM binding potency. Felodipine (10-50 microM) and bepridil (50 microM) markedly reduced activities of SL Ca2+ pumping ATPase and PDE. Striking differences were, however, demonstrated when Ca2+ and CaM concentrations, respectively, were increased. Previously it was reported that inhibition of the SL Ca2+ pumping ATPase by the CaM antagonist calmidazolium could be overcome by increasing Ca2+ concentrations (J. M. J. Lamers and J. T. Stinis, Cell Calcium 4, 281-294, 1983). Felodipine (10-50 microM) in the present study, appeared to be equipotent with calmidazolium in reducing Ca2+ pumping ATPase, but increasing Ca2+ up to 12.2 microM could not counteract this effect. Felodipine (2-10 microM) also inhibited brain PDE noncompetitively with respect to CaM contrary to the competitive effectors calmidazolium and bepridil. On the other hand, bepridil (10-20 microM) decreased or increased Ca2+ pumping ATPase activity depending on the Ca2+ concentration (0.29 and 12.2 microM, respectively) used. These findings suggest at least two types of CaM antagonists, which can be discriminated on basis of their inhibition patterns of PDE and heart SL Ca2+ pumping ATPase.

DrugBank Data that Cites this Article

Drug Targets
DrugTargetKindOrganismPharmacological ActionActions
BepridilCalcium/calmodulin-dependent 3',5'-cyclic nucleotide phosphodiesterase 1AProteinHumans
Unknown
Inhibitor
Details
BepridilCalcium/calmodulin-dependent 3',5'-cyclic nucleotide phosphodiesterase 1BProteinHumans
Unknown
Inhibitor
Details
BepridilCalmodulinProteinHumans
Unknown
Binder
Details
BepridilSodium/potassium-transporting ATPase subunit alpha-1ProteinHumans
Unknown
Inhibitor
Details
FelodipineCalcium/calmodulin-dependent 3',5'-cyclic nucleotide phosphodiesterase 1AProteinHumans
Unknown
Inhibitor
Details
FelodipineCalcium/calmodulin-dependent 3',5'-cyclic nucleotide phosphodiesterase 1BProteinHumans
Unknown
Inhibitor
Details
FelodipineCalmodulinProteinHumans
Unknown
Other
Details
NifedipineCalmodulinProteinHumans
Unknown
Inhibitor
Details
PrenylamineCalmodulinProteinHumans
Unknown
Not AvailableDetails
PrenylamineMyosin light chain kinase 2, skeletal/cardiac muscleProteinHumans
Unknown
Inhibitor
Details