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• W1567216262 abstract "Fluspirilene binds with high affinity to a single class of sites in purified porcine cardiac sarcolemmal membrane vesicles at a Kd of 0.6 nM and a Bmax that is in approximately 1:1 stoichiometry with other Ca2+ entry blocker receptors. Fluspirilene binding is modulated by various classes of L-type Ca2+ channel effectors. Metal ion channel inhibitors (e.g. Cd2+) stimulate binding primarily by increasing ligand affinity, whereas channel substrates (e.g. Ca2+) inhibit binding. Dihydropyridine, aralkylamine, and benzothiazepine Ca2+ entry blockers partially inhibit binding with Ki values equivalent to their respective Kd values, indicating close coupling between binding sites for the former agents and the diphenylbutylpiperidine site. All of these agents function as mixed inhibitors and affect both Kd and Bmax of fluspirilene binding. Only other substituted diphenylbutylpiperidines (e.g. pimozide) inhibit binding competitively. Diphenylbutylpiperidines, on the other hand, block nitrendipine, D-600, and diltiazem binding through a noncompetitive mechanism with Ki values much reduced from their measured Kd values, suggesting that coupling between the diphenylbutylpiperidine site and receptors for diverse Ca2+ entry blockers is more indirect. In addition, high affinity sites have been detected for fluspirilene in bovine aortic sarcolemmal vesicles, rat brain synaptic membranes, and GH3 rat anterior pituitary cell plasma membranes. Fluspirilene also effectively blocks Ca2+ flux through L-type Ca2+ channels in GH3 cells. Together, these results suggest that fluspirilene binds with high affinity to a unique fourth site in the Ca2+ entry blocker receptor complex and that substituted diphenylbutylpiperidines represent a new structural class of potent L-type Ca2+ channel inhibitors." @default.
• W1567216262 created "2016-06-24" @default.
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• W1567216262 date "1989-04-01" @default.
• W1567216262 modified "2023-10-18" @default.
• W1567216262 title "Substituted Diphenylbutylpiperidines Bind to a Unique High Affinity Site on the L-type Calcium Channel" @default.
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• W1567216262 doi "https://doi.org/10.1016/s0021-9258(18)83595-5" @default.
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