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Enantiomer selectivity and the development of tolerance to the behavioral effects of the calcium channel activator BAY K 8644.

Abstract：

:The putative behavioral effects of the enantiomers of BAY K 8644 and the behavioral responses to (+/-)-BAY K 8644 following chronic injection were assessed on motor function in mice. The interaction of the enantiomers of BAY K 8644 with mouse brain dihydropyridine binding sites was also evaluated. The calcium channel activating enantiomer (-)-S-BAY K 8644 impaired rotarod and motor activity with an ED50 value of 0.5 mg/kg. The calcium channel blocker enantiomer (+)-R-BAY K 8644 neither affected rotarod nor motor activity. (+)-R-BAY K 8644, and the structurally related dihydropyridine calcium channel blockers nifedipine and (-)-202-791 inhibited the impairment of rotarod activity by (-)-S-BAY K 8644 in a dose-dependent manner. (+/-)-BAY K 8644 produced convulsions in mice with a CD50 of 5 mg/kg. Chronic injection of (+/-)-BAY K 8644 (8 mg/kg IP once each day for four days) resulted in a significant tolerance to, and increase in recovery from, the motor deficits produced by (+/-)-BAY K 8644. Furthermore, chronic treatment with (+/-)-BAY K 8644 increased the onset time, but did not reduce the number of mice having convulsions to (+/-)-BAY K 8644. Chronic injection of nifedipine did not affect the motor deficit and convulsive activity of (+/-)-BAY K 8644. The behavioral effects of (+/-)-BAY K 8644 were observed at significant brain levels of drug. [3H]Nitrendipine binding to mouse brain dihydropyridine binding sites was unchanged in mice chronically injected with either (+/-)-BAY K 8644 or nifedipine.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Brain Res Bull

journal_title

Brain research bulletin

authors

O'Neill SK,Bolger GT

doi

10.1016/0361-9230(88)90019-6

subject

Has Abstract

pub_date

1988-12-01 00:00:00

pages

865-72

issue

6

eissn

0361-9230

issn

1873-2747

pii

0361-9230(88)90019-6

journal_volume

21

pub_type

杂志文章

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