The binding interactions of Ro 40-5967 at the L-type Ca2+ channel in cardiac tissue.

Abstract:

:Ro 40-5967 [(1S,2S)-2-[2[3-(2-benzamidopropyl]- methylamino]ethyl]-6-fluoro-1,2,3,4-tetrahydro-1-isopropyl-2-naphthyl- methoxyacetate] is a new Ca2+ channel antagonist active at L-type channels. Radioligand binding studies in cardiac tissue show that Ro 40-5967 does not inhibit 1,4-dihydropyridine binding, but does inhibit diltiazem, desmethoxyverapamil and SR 33557 binding with IC50 values of 8 x 10(-9), 10(-8) and 5 x 10(-8) M, respectively. Equilibrium and kinetic binding studies showed that Ro 40-5967 inhibited both desmethoxyverapamil and SR 33557 binding in an apparently competitive manner. Ro 40-5967 defines an additional and possibly unique antagonist binding site on the L-type voltage-gated Ca2+ channel.

journal_name

Eur J Pharmacol

authors

Rutledge A,Triggle DJ

doi

10.1016/0014-2999(95)00194-p

subject

Has Abstract

pub_date

1995-07-04 00:00:00

pages

155-8

issue

2

eissn

0014-2999

issn

1879-0712

pii

0014-2999(95)00194-P

journal_volume

280

pub_type

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