Novel 5-substituted benzyloxy-2-arylbenzofuran-3-carboxylic acids as calcium activated chloride channel inhibitors.
Transmembrane protein 16A (TMEM16A) channels are recently discovered membrane proteins that functions as a calcium activated chloride channel (CaCC). CaCCs are major regulators of various physiological processes, such as sensory transduction, epithelial secretion, smooth muscle contraction and oocyte fertilization. Thirty novel 5-substituted benzyloxy-2-arylbenzofuran-3-carboxylic acids (B01-B30) were synthesized and evaluated for their TMEM16A inhibitory activity by using short circuit current measurements in Fischer rat thyroid (FRT) cells expressing human TMEM16A. IC(50) values were calculated using YFP fluorescence plate reader assay. Final compounds, having free carboxylic group displayed significant inhibition. Eight of the novel compounds B02, B13, B21, B23, B25, B27, B28, B29 exhibit excellent CaCCs inhibition with IC(50) value <6 μM, with compound B25 exhibiting the lowest IC(50) value of 2.8 ± 1.3 μM. None of the tested ester analogs of final benzofuran derivatives displayed TMEM16A/CaCCs inhibition.
Department of Chemistry, Kurukshetra University, Kurukshetra, Haryana 136119, India.
Satish
S
Kumar
Wan
W
Namkung
A S
AS
Verkman
Pawan K
PK
Sharma
D000818:Animals; D000075369:Anoctamin-1; D001572:Benzofurans / Q000737:chemistry*; D002118:Calcium / Q000378:metabolism*; D002264:Carboxylic Acids / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D002460:Cell Line; D018118:Chloride Channels / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000378:metabolism; D006801:Humans; D008564:Membrane Potentials / Q000187:drug effects; D009363:Neoplasm Proteins / Q000235:genetics / Q000378:metabolism; D051381:Rats; D013329:Structure-Activity Relationship
C476213:ANO1 protein, human; D000075369:Anoctamin-1; D001572:Benzofurans; C492109:CLCA1 protein, human; D002264:Carboxylic Acids; D018118:Chloride Channels; D009363:Neoplasm Proteins; C105430:benzofuran; D002118:Calcium