title: On benzofuroindole analogues as smooth muscle relaxants.
abstract: At least two laboratories have independently reported the synthesis of benzofuroindole compounds having potential therapeutic implications in many disease states including those that involve smooth muscle hyperactivity. Through a series of in vitro screenings, they demonstrated the efficacy (and selectivity) of these compounds to potentiate large conductance calcium- (Ca²⁺-) activated K⁺ (BK(Ca)) channels, by far, the most characterized of all Ca²⁺-dependent K⁺ channels. Interestingly, promising benzofuroindole derivatives such as compound 7 (10H-benzo[4,5]furo[3,2-b]indole) and compound 22 (4-chloro-7-trifluoromethyl-10H-benzo[4,5]furo[3,2-b]indole-1-carboxylic acid) both exhibited high bladder (versus aorta) selectivity, making them attractive alternative treatments for bladder overactivity. In recent reports, compound 22 (LDD175 or TBIC) also showed inhibition of ileum and uterine contractions, indicating multiple target tissues, which is not surprising as BK(Ca) channels are ubiquitously expressed in the animal and human tissues. In this paper, the authors discuss the value of benzofuroindole compounds and the challenges that need to be overcome if they were considered as smooth muscle relaxants.
authors.affiliation: Uimyung Research Institute for Neuroscience and Department of Pharmacology, Sahmyook University, 26-21 Kongkreung-dong, Nowon-gu, 139-742 Seoul, Republic of Korea.
authors.forename: Ike
authors.initials: I
authors.lastname: dela Peña
authors.forename: Jae Hoon
authors.initials: JH
authors.lastname: Cheong
mesh_terms: D000818:Animals; D001572:Benzofurans / Q000494:pharmacology*; D006801:Humans; D007211:Indoles / Q000494:pharmacology*; D009119:Muscle Contraction / Q000187:drug effects; D009126:Muscle Relaxation / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects* / Q000378:metabolism; D018373:Peripheral Nervous System Agents / Q000494:pharmacology*; D024681:Potassium Channels, Calcium-Activated / Q000378:metabolism
chemical_list: D001572:Benzofurans; D007211:Indoles; D018373:Peripheral Nervous System Agents; D024681:Potassium Channels, Calcium-Activated