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Catalog No.S2126 Synonyms: KT-611

1 publication

Naftopidil  Chemical Structure

CAS No. 57149-07-2

Naftopidil (KT-611) is a selective α1-adrenergic receptor antagonist with Ki of 3.7 nM, 20 nM, and 1.2 nM for α1a, α1b, and α1d, respectively, used for the treatment of benign prostatic hyperplasia.

Selleck's Naftopidil has been cited by 1 publication

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Description Naftopidil (KT-611) is a selective α1-adrenergic receptor antagonist with Ki of 3.7 nM, 20 nM, and 1.2 nM for α1a, α1b, and α1d, respectively, used for the treatment of benign prostatic hyperplasia.
α1D-adrenergic receptor [1] α1A-adrenergic receptor [1] α1B-adrenergic receptor [1]
1.2 nM(Ki) 3.7 nM(Ki) 20 nM(Ki)
In vitro

Naftopidil is selective for the alpha1d-adrenoceptor with approximately 3- and 17-fold higher affinity than for the alpha1a- and alpha1b-adrenoceptor subtypes, respectively. [1] Naftopidil has growth inhibitory effect in androgen-sensitive and -insensitive human prostate cancer cell lines. Naftopidil induces p21(cip1) but not p27(kip1) in PC-3 cells. [2] Naftopidil induces apoptosis in all the investigated malignant mesothelioma cells, and a similar effect is obtained with prazosin, another α1-adrenoceptor blocker. Naftopidil-induced reduction in cell viability is inhibited by GF109203X, while prazosin-induced in cell viability is less affected. [3] Naftopidil, an alpha 1-adrenoreceptor antagonist produces a concentration-dependent inhibition ofcollagen-induced Ca2+ mobilization, maximum inhibition (22.9%) occurring with 40 mM Naftopidil. Naftopidil also inhibits the adrenaline-induced rise in [Ca2+]i in a concentration-dependent manner (30 mM doxazosin), significant inhibitions of platelet aggregation also being produced. [4] Naftopidil (0.3, 1, and 3 μM) inhibits 5-HT-induced bladder contraction in a concentration-dependent manner. Naftopidil inhibits both the 5-HT(2A) and 5-HT(2) receptor agonists-induced bladder contractions. Naftopidil binds to the human 5-HT(2A) and 5-HT(2B) receptors with pKi values of 6.55 and 7.82, respectively. [5]

In vivo Naftopidil selectively inhibits the phenylephrine-induced increase in prostatic pressure compared with mean blood pressure in the anesthetized dog model. [1] Naftopidil inhibits 5-HT-induced bladder contraction via blockade of the 5-HT(2A) and 5-HT(2B) receptors in rats. [5]


Solubility (25°C)

In vitro DMSO 79 mg/mL (201.27 mM)
Water Insoluble
Ethanol Insoluble

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Chemical Information

Molecular Weight 392.49


CAS No. 57149-07-2
Storage powder
in solvent
Synonyms KT-611

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Clinical Trial Information

NCT Number Recruitment interventions Conditions Sponsor/Collaborators Start Date Phases
NCT00967772 Completed Drug: Naftopidil Healthy Dong-A ST Co. Ltd. September 2009 Phase 1

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID