L-765314

L-765314 is a selective and potent α1b-adrenoceptor (α1b adrenergic receptor) antagonist with an IC50 of 1.90 nM and Kis of 5.4 and 2.0 for rat and human α1b adrenergic receptor, respectively.

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Background

L-765314 is a selective and potent α1b-adrenoceptor (α1b adrenergic receptor) antagonist with an IC50 of 1.90 nM and Kis of 5.4 and 2.0 for rat and human α1b adrenergic receptor, respectively.

L-765,314 is a potent and selective α1b adrenergic receptor antagonist, which also reduces melanin production by targeting the protein kinase C (PKC)-dependent regulation of tyrosinase activity and raises the intracellular level of melanin precursors.[2]

[1] Patane MA, et al. Journal of Medicinal Chemistry, 41(8), 1205–1208. [2] Kim J, et al. Molecules. 2019 Feb 21;24(4):773.

Protocol

Animal experiment:

Rats[1]The potency of terazosin and L-765314 for inhibiting the pressor responses to phenylephrine and A-61603 is evaluated in anesthetized male Sprague-Dawley rats (n=4). The rats are dosed i.v with either vehicle or ascending doses of test compounds, and the peak changes in mean arterial pressure are measured. The dose of antagonist eliciting a 25 mmHg decrease in mean arterial pressure (AD25) is calculated as an index of hypotensive potency. The rats are dosed i.v with L-765314 at 3 mg/kg , and the plasma is assayed by LCMS for parent compound[1].

参考文献:

[1]. Patane MA, et al. 4-Amino-2-[4-[1-(benzyloxycarbonyl)-2(S)- [[(1,1-dimethylethyl)amino]carbonyl]-piperazinyl]-6, 7-dimethoxyquinazoline (L-765,314): a potent and selective alpha1b adrenergic receptor antagonist. J Med Chem. 1998 Apr 9;41(8):1205-8.
[2]. Tobias B?hmer, et al. The α1B-adrenoceptor subtype mediates adrenergic vasoconstriction in mouse retinal arterioles with damaged endothelium. Br J Pharmacol. 2014 Aug; 171(16): 3858–3867.