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Cyclandelate as a calcium modulating agent in rat cerebral cortex.

A Bast, R Leurs, H Timmerman

|January 1, 1987

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Cyclandelate may improve cerebrovascular conditions by modulating calcium channels. This study found cyclandelate and its alcohol metabolite interact with calcium entry blocker binding sites on rat brain membranes.

Area of Science:

Neuropharmacology
Cardiovascular Pharmacology

Background:

Cyclandelate is clinically used for cerebrovascular disorders.
Its exact mechanism of action remains unclear.

Purpose of the Study:

To investigate the interaction of cyclandelate and its metabolites (cyclandelate alcohol, cyclandelate acid) with calcium channel binding sites.
To elucidate the potential role of calcium modulation in cyclandelate's therapeutic effects.

Main Methods:

Radioligand binding assay using [3H]-nitrendipine on rat cerebral cortex membranes.
Testing cyclandelate, cyclandelate alcohol, and cyclandelate acid for their ability to inhibit or enhance [3H]-nitrendipine binding.
Comparison with known calcium channel blockers: nifedipine, d-cis diltiazem, and verapamil.

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Main Results:

Cyclandelate demonstrated a dissociation constant (Kd) of 7.1 x 10(-5) mol/L, inhibiting 35% of [3H]-nitrendipine binding.
Cyclandelate alcohol showed a Kd of 1.7 x 10(-4) mol/L, with maximal 70% inhibition.
Cyclandelate acid was inactive; comparisons with nifedipine, diltiazem, and verapamil provided reference values.

Conclusions:

Cyclandelate and its alcohol metabolite interact with the binding sites of 1,4-dihydropyridine calcium channel blockers.
These interactions suggest that cyclandelate's clinical efficacy in conditions like cerebral ischemia may involve calcium channel modulation.