Publication List English

2019/10/15
C3orf70 Is Involved in Neural and Neurobehavioral Development

2019/09/22
Generation of a Triple-Transgenic Zebrafish Line for Assessment of Developmental Neurotoxicity during Neuronal Differentiation

2019/07/17
Aging-associated microstructural deterioration of vertebra in zebrafish

2019/03/18
Zebrafish yolk sac microinjection of thalidomide for assessment of developmental toxicology

2019/02/18
Toxicological Evaluation of SiO2 Nanoparticles by Zebrafish Embryo Toxicity Test

tDifferent sensitivities of Ca2+, calmodulin-dependent cyclic nucleotide phosphodiesterases from rabbit aorta and brain to dihydropyridine calcium channel blockers.

                     
1987/11/13

Matsushima S, Tanaka T, Saitoh M, Watanabe M, Hidaka H.
Biochem Biophys Res Commun. 1987 Nov 13;148(3):1468-74.

Abstract

The concentrations of the dihydropyridines, CD-349, nicardipine, and nimodipine, producing 50% inhibition of Ca2+, calmodulin (CaM)-dependent cyclic nucleotide phosphodiesterase (CaPDE) from rabbit aorta in the absence of Ca2+-CaM complex were approximately 7 to 13-fold higher than these of aorta CaPDE in the presence of Ca2+-CaM complex and of the trypsin treated enzyme form. On the other hand, these dihydropyridine derivatives inhibited CaPDE from rabbit brain at much the same IC50 values seen in the absence and presence of the Ca2+-CaM complex and the trypsin-treated enzyme. Kinetic analysis revealed that these dihydropyridines inhibited the activities of CaPDEs from both the aorta and brain, competitively with cyclic GMP as substrate, and the Ki values of CD-349 for CaPDE from aorta or brain in the absence or presence of Ca2+-CaM complex and trypsin-treated enzyme were 9.6, 0.75, 0.75 or 0.69, 0.70, 0.66 microM, respectively. These results suggest that CaPDE from the rabbit aorta differs from this enzyme in the brain, with regard to the relationship between the dihydropyridine binding sites on CaPDE molecules and the domains regulated by the Ca2+-CaM complex or limited proteolysis.

ŠÖ˜AƒŠƒ“ƒN

Pubmed