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- W149714080 abstract "The 1,4-dihydropyridine (+/-)-[3H]nitrendipine reversibly binds to mitochondrial preparations from guinea-pig heart with a dissociation constant (Kd) of 593 +/- 77 nM and a maximum density of binding sites (Bmax.) of 1.75 +/- 0.27 nmol/mg of protein. This low-affinity high-capacity 1,4-dihydropyridine-binding site does not discriminate between the enantiomers of nitrendipine and is also found in mitochondrial membranes from guinea-pig liver (Kd 586 +/- 91 nM; Bmax. 0.36 +/- 0.04 nmol/mg of protein) and kidney (Kd 657 +/- 149 nM; Bmax. 0.56 +/- 0.12 nmol/mg of protein). Phenylalkylamines (e.g. verapamil) inhibit (+/-)-[3H]nitrendipine binding with micromolar inhibition constants, but the benzothiazepine D-cis-diltiazem, a potent Ca2+-channel blocker, is without effect. The binding is heat-stable, shows a V-shaped pH-dependence with a minimum around pH 7.0, and is strongly dependent on ionic strength in the incubation medium. The cations La3+ greater than Cd2+ much greater than Co2+ greater than Ca2+ much greater than Ba2+ greater than Mg2+ greater than Li+ greater than Na+ and the anions NO3- greater than C1- greater than or equal to F- stimulate the binding, whereas PO4(3-) greater than SO4(2-) slightly inhibit it. The low-affinity (+/-)-[3H]nitrendipine-binding site located on the mitochondrial inner membrane is biochemically and pharmacologically different from the 1,4-dihydropyridine-receptor domain of the L-type Ca2+ channel. Furthermore, it is not identical with any of the low-affinity 1,4-dihydropyridine-binding sites described so far." @default.
- W149714080 created "2016-06-24" @default.
- W149714080 creator A5041210319 @default.
- W149714080 creator A5086829899 @default.
- W149714080 date "1988-07-01" @default.
- W149714080 modified "2023-09-28" @default.
- W149714080 title "A novel 1,4-dihydropyridine-binding site on mitochondrial membranes from guinea-pig heart, liver and kidney" @default.
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- W149714080 doi "https://doi.org/10.1042/bj2530049" @default.
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