Referenced in: none

Automatically associated channels: Kir6.1 , Kir6.2

Title: Synthesis of modified 4H-1,2,4-benzothiadiazine-1,1-dioxides and determination of their affinity and selectivity for different types of K(ATP) channels.

Authors: Stefan Lachenicht, Andreas Fischer, Claas Schmidt, Marcus Winkler, Achim Rood, Horst Lemoine, Manfred Braun

Journal, date & volume: ChemMedChem, 2009 Nov , 4, 1850-8

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/19774590

Abstract
4H-1,2,4-Benzothiadiazine-1,1-dioxides with various substituents in positions 3, 5, and 7 were synthesized and tested as K(ATP) channel agonists in artificial cell systems (CHO cells transfected with SUR1/Kir6.2, and HEK 293 transfected with SUR2B/Kir6.1) as model systems for insulin-secreting pancreatic beta-cells and for smooth muscle cells, respectively. The effects of agonists were tested in intact cells using DiBAC4(3) [bis-(1,3-dibarbituric acid)trimethine oxanol] as a membrane potential dye, and the results compared with their binding affinity for the SUR2B-type K(ATP) channels using the radioligand [(3)H]P1075. Compounds with cycloalkyl and (cycloalkyl)methyl side chains in position 3 had higher affinities towards the SUR2B/Kir6.1 receptor compared with the parent compound diazoxide (1 a). Compounds with bulky, nonpolar residues in position 3 exhibited remarkable selectivity for SUR2B-type K(ATP) channels. The compound substituted with a bulky (1-adamantyl)methyl residue exhibited micromolar affinity and activity on SUR2B-type K(ATP) channels without being able to activate the SUR1-type K(ATP) channels.