Dihydropyridine derivatives prolong the open state of Ca channels in cultured cardiac cells.

S Kokubun, H Reuter - … of the National Academy of Sciences, 1984 - National Acad Sciences
The dihydropyridine derivatives CGP 28392 and BAY K 8644 exert a strong positive
inotropic effect in mammalian cardiac muscle, presumably by increasing Ca influx during the …

Studies on Ca channels in intact cardiac cells: voltage-dependent effects and cooperative interactions of dihydropyridine enantiomers.

S Kokubun, B Prod'Hom, C Becker… - Molecular …, 1986 - molpharm.aspetjournals.org
We have investigated the effects of two oppositely acting enantiomers of the 1, 4-
dihydropyridine derivative 202-791 on voltage-dependent Ca channels by combining …

Dual effects of dihydropyridines on whole cell and unitary calcium currents in single ventricular cells of guinea‐pig.

AM Brown, DL Kunze, A Yatani - The Journal of physiology, 1986 - Wiley Online Library
We studied the effects of dihydropyridine Ca channel ligands (DHPs), mainly nitrendipine
and Bay K8644, on whole cell and single channel Ca currents on single myocytes isolated …

Voltage-dependent modulation of Ca channel current in heart cells by Bay K8644.

MC Sanguinetti, DS Krafte, RS Kass - The Journal of general physiology, 1986 - rupress.org
We have investigated the voltage-dependent effects of the dihydropyridine Bay K8644 on
Ca channel currents in calf Purkinje fibers and enzymatically dispersed rat ventricular …

1,4‐Dihydropyridine Ca2+ channel antagonists and activators: A comparison of binding characteristics with pharmacology

RA Janis, DJ Triggle - Drug Development Research, 1984 - Wiley Online Library
This comparison of the binding characteristics and pharmacology of 1, 4‐dihydropyridines
indicates that the high‐affinity binding sites studied in cardiac and smooth muscle cells …

A dihydropyridine (Bay k 8644) that enhances calcium currents in guinea pig and calf myocardial cells. A new type of positive inotropic agent.

G Thomas, M Chung, CJ Cohen - Circulation research, 1985 - Am Heart Assoc
Bay k 8644 is a structural analog of nifedipine with positive inotropic activity. The mechanism
of drug action was evaluated by measuring the effects of Bay k 8644 on twitch tension …

A comparison between the binding and electrophysiological effects of dihydropyridines on cardiac membranes.

SL Hamilton, A Yatani, K Brush… - Molecular …, 1987 - molpharm.aspetjournals.org
To investigate the mechanism of action of dihydropyridines on calcium channels, both
receptor binding and the electrophysiological effects of optically pure enantiomers of Bay k …

Dihydropyridine-sensitive Ca2+ channels in mammalian skeletal muscle cells in culture: electrophysiological properties and interactions with Ca2+ channel activator …

C Cognard, G Romey, JP Galizzi… - Proceedings of the …, 1986 - National Acad Sciences
The whole-cell patch-clamp technique has been used to analyze the properties of the
dihydropyridine-sensitive Ca2+ channel in rat skeletal muscle cells (myoballs) in culture …

Regulation of cardiac calcium channel current and contractile activity by the dihydropyridine Bay K8644 is voltage-dependent

MC Sanguinetti, RS Kass - Journal of molecular and cellular cardiology, 1984 - Elsevier
Pharmacological studies have provided considerable information about the molecular
structure of ion channels in the membranes of excitable cells. Two classes of drugs, the local …

Voltage-dependent block of calcium channel current in the calf cardiac Purkinje fiber by dihydropyridine calcium channel antagonists.

MC Sanguinetti, RS Kass - Circulation research, 1984 - Am Heart Assoc
We have investigated the mechanisms of blockade of calcium channel current by the
dihydropyridines, eg nisoldipine, nitrendipine, and nicardipine. Membrane current was …