Abstract：
:The binding properties of a new 1,5-benzothiazepine, clentiazem (TA-3090), were investigated in rat cerebral cortex and skeletal muscle membranes with [3H]diltiazem and [3H]nitrendipine as radioligands. Clentiazem inhibited [3H]diltiazem binding to cerebral cortex membranes at the same concentrations as diltiazem at 2 degrees C. However, at 37 degrees C clentiazem was 3 times more potent to inhibit binding than diltiazem. [3H]Nitrendipine binding was modulated by clentiazem in a temperature-dependent manner. At 37 degrees C clentiazem significantly enhanced [3H]nitrendipine binding to rat cerebral cortex membranes, whereas it has an inhibitory effect on [3H]nitrendipine binding at 0 degree C and no effect at 25 degrees C. Of two optical isomers of clentiazem and four of diltiazem, only d-cis isomers (clentiazem and diltiazem) increased [3H]nitrendipine binding, indicating that both compounds have the same stereoselectivity for increasing [3H]nitrendipine binding. These results suggest that clentiazem binds to the same 1,5-benzothiazepine binding sites as diltiazem but with greater affinity.
journal_name
Eur J Pharmacoljournal_title
European journal of pharmacologyauthors
Suzuki T,Kurosawa H,Naito K,Otsuka M,Ohashi M,Takaiti Odoi
10.1016/0014-2999(91)90105-ysubject
Has Abstractpub_date
1991-03-05 00:00:00pages
195-200issue
2-3eissn
0014-2999issn
1879-0712pii
0014-2999(91)90105-Yjournal_volume
194pub_type
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