Pharmacological characterization of M-II, the major human metabolite of ramelteon.

Abstract:

:The duration of action of melatonin may be important for improvements in sleep efficiency in insomniacs. Ramelteon, a selective melatonin agonist, is primarily metabolized to the active metabolite M-II, which has a longer half-life and greater systemic exposure than ramelteon. Hence, M-II may contribute significantly to the hypnotic benefits of ramelteon. We assessed the ramelteon-like activity of M-II in vitro and in vivo using cats. Binding and functional studies in Chinese hamster ovary cells expressing human melatonin receptors (MT1 or MT2) revealed that M-II binds melatonin receptors with lower affinity (Ki: 114 and 566 pmol/l for MT1 and MT2, respectively) and has lower potency (IC50: 208 and 1,470 pmol/l for MT1 and MT2, respectively) compared with ramelteon. However, higher M-II doses significantly improved sleep in cats. Thus, M-II may contribute to the clinical efficacy of ramelteon.

journal_name

Pharmacology

journal_title

Pharmacology

authors

Nishiyama K,Nishikawa H,Kato K,Miyamoto M,Tsukamoto T,Hirai K

doi

10.1159/000362459

subject

Has Abstract

pub_date

2014-01-01 00:00:00

pages

197-201

issue

3-4

eissn

0031-7012

issn

1423-0313

pii

000362459

journal_volume

93

pub_type

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