(R)-Terazosin
(Synonyms: (R)-特拉唑嗪) 目录号 : GC39298
(R)-Terazosin 是 Terazosin 的活性 R 型对应体, 是一种有效的 α1-肾上腺素受体拮抗剂,对 α1a,α1b 和 α1d-肾上腺素受体的 Ki 值分别为 6.51 nM,1.01 nM 和 1.97 nM。
Cas No.:109351-34-0
Sample solution is provided at 25 µL, 10mM.
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(R)-Terazosin is an active R-enantiomer of Terazosin. (R)-Terazosin is a potent α1-adrenoceptor antagonist with Ki values of 6.51 nM, 1.01 nM and 1.97 nM for α1a, α1b and α1d-adrenoceptor, respectively[1].
[1]. Hancock AA, et al. Actions of terazosin and its enantiomers at subtypes of alpha 1- and alpha 2-adrenoceptors in vitro. J Recept Signal Transduct Res. 1995 Sep-Dec;15(7-8):863-85.
Cas No. | 109351-34-0 | SDF | |
别名 | (R)-特拉唑嗪 | ||
Canonical SMILES | O=C(N1CCN(C2=NC(N)=C3C=C(OC)C(OC)=CC3=N2)CC1)[C@@H]4OCCC4 | ||
分子式 | C19H25N5O4 | 分子量 | 387.43 |
溶解度 | DMSO: 75 mg/mL (193.58 mM) | 储存条件 | Store at -20°C |
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1 mg | 5 mg | 10 mg |
1 mM | 2.5811 mL | 12.9056 mL | 25.8111 mL |
5 mM | 0.5162 mL | 2.5811 mL | 5.1622 mL |
10 mM | 0.2581 mL | 1.2906 mL | 2.5811 mL |
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Pharmacokinetics of terazosin enantiomers in healthy Chinese male subjects
Chirality 2012 Dec;24(12):1047-50.PMID:22887707DOI:10.1002/chir.22095.
The purpose of this study was to elucidate the pharmacokinetics of terazosin enantiomers in healthy Chinese male subjects. After a single oral dose of 2-mg terazosin, the plasma concentrations of terazosin enantiomers were measured over the course of 48 h in 12 healthy subjects. The plasma concentrations of (+)-(R)-Terazosin at all time points were higher than those of (-)-(S)-Terazosin. The area under the plasma concentration-time curve (AUC(0-∞) ) and maximum plasma concentration of (+)-(R)-Terazosin were significantly greater than those of the (-)-(S)-Terazosin (P < 0.01, respectively). The R/S ratio of AUC(0-∞) of terazosin was 1.68. For the first time, it was proven that the pharmacokinetics of terazosin was stereoselective in healthy Chinese male subjects.
Alpha 1-adrenoceptor properties of terazosin HCl and its enantiomers in the human prostate and canine brain
Prostate 1992;20(2):159-65.PMID:1347941DOI:10.1002/pros.2990200211.
The objective of the present study was to characterize the alpha 1-adrenoceptor binding properties of terazosin and its enantiomers in human prostate and canine brain. Human prostate adenomas were obtained from 7 males undergoing prostatectomy for symptomatic BPH and canine cerebral cortices were obtained from 6 male beagles. Competitive displacement experiments were carried out on these tissue homogenates in the presence of a constant concentration ([180 pM]) of 125I-Heat and varying concentrations of unlabelled terazosin and its enantiomers. The Ki of terazosin and its enantiomers were determined from these binding studies. The mean Ki of rac-terazosin, R(+)-Terazosin, and S(-)-Terazosin in human prostate was 3.6 nM, 3.8 nM, and 2.8 nM, respectively. The differences between these mean Ki values were not statistically significant. The mean Ki of rac-terazosin, R(+)-Terazosin, and S(-)-Terazosin in canine brain were 6.7 nM, 8.4 nM, and 5.6 nM, respectively. The differences between these mean Ki values were not significantly different. The mean Ki of terazosin and its enantiomers were consistently lower in the human prostate compared to canine brain (P less than 0.05). The present study does not provide any evidence suggesting differential effects of terazosin enantiomers on the human prostate. The twofold difference between the Ki values in the prostate and brain suggests that different subtypes of the alpha 1-receptor might be present in these tissues.
Actions of terazosin and its enantiomers at subtypes of alpha 1- and alpha 2-adrenoceptors in vitro
J Recept Signal Transduct Res 1995 Sep-Dec;15(7-8):863-85.PMID:8673721DOI:10.3109/10799899509049862.
Terazosin and its enantiomers, antagonists of alpha 1-adrenoceptors, were studied in radioligand binding and functional assays to determine relative potencies at subtypes of alpha 1- and alpha 2-adrenoceptors in vitro. The racemic compound and its enantiomers showed high and apparently equal affinity for subtypes of alpha 1-adrenoceptors with Kl values in the low nanomolar range, and showed potent antagonism of alpha 1-adrenoceptors in isolated tissues, with the enantiomers approximately equipotent to the racemate at each alpha 1-adrenoceptor subtype. At alpha 2b sites, R(+) terazosin bound less potently than either the S(-) enantiomer or racemate. R(+) terazosin was also less potent than the S(-) enantiomer or the racemate at rat atrial alpha 2B receptors. These agents were not significantly different in their potencies at alpha 2a or alpha 2A sites. Since the high affinity for alpha 2B sites of quinazoline-type alpha-adrenoceptor antagonists has been used to differentiate alpha 2-adrenoceptor subtypes, the low affinity of R(+) terazosin for these sites was unexpected. Because terazosin or its enantiomers are approximately equipotent at alpha 1-adrenoceptor subtypes, the lower potency of R(+) terazosin at alpha 2B receptors indicates a somewhat greater selectivity for alpha 1-compared to alpha 2B adrenoceptor subtypes. The possible pharmacological significance of this observation is discussed.