Caco-2 permeability studies and hERG liability assessment of tryptanthrin and indolinone

Jähne, E. A. and Eigenmann, D. E. and Moradi-Afrapoli, F. and Verjee, S. and Butterweck, V. and Hebeisen, S. and Hettich, T. and Schlotterbeck, G. and Smiesko, M. and Hamburger, M. and Oufir, M.. (2016) Caco-2 permeability studies and hERG liability assessment of tryptanthrin and indolinone. Planta Medica, 82 (13). pp. 1192-1201.

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Official URL: http://edoc.unibas.ch/44442/

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Tryptanthrin and (E,Z)-3-(4-hydroxy-3,5-dimethoxybenzylidene)indolinone (indolinone) were recently isolated from Isatis tinctoria as potent anti-inflammatory and antiallergic alkaloids, and shown to inhibit COX-2, 5-LOX catalyzed leukotriene synthesis, and mast cell degranulation at low µM to nM concentrations. To assess their suitability for oral administration, we screened the compounds in an in vitro intestinal permeability assay using human colonic adenocarcinoma cells. For exact quantification of the compounds, validated UPLC-MS/MS methods were used. Tryptanthrin displayed high permeability (apparent permeability coefficient > 32.0 × 10(-6) cm/s) across the cell monolayer. The efflux ratio below 2 (< 1.12) and unchanged apparent permeability coefficient values in the presence of the P-glycoprotein inhibitor verapamil (50 µM) indicated that tryptanthrin was not involved in P-glycoprotein interactions. For indolinone, a low recovery was found in the human colon adenocarcinoma cell assay. High-resolution mass spectrometry pointed to extensive phase II metabolism of indolinone (sulfation and glucuronidation). Possible cardiotoxic liability of the compounds was assessed in vitro by measurement of an inhibitory effect on human ether-a-go-go-related gene tail currents in stably transfected HEK 293 cells using the patch clamp technique. Low human ether-a-go-go-related gene inhibition was found for tryptanthrin (IC50 > 10 µM) and indolinone (IC50 of 24.96 µM). The analysis of compounds using various in silico methods confirmed favorable pharmacokinetic properties, as well as a slight inhibition of the human ether-a-go-go-related gene potassium channel at micromolar concentrations.
Faculties and Departments:05 Faculty of Science > Departement Pharmazeutische Wissenschaften > Ehemalige Einheiten Pharmazie > Molecular Modeling (Vedani)
05 Faculty of Science > Departement Pharmazeutische Wissenschaften > Pharmazie > Pharmazeutische Biologie (Hamburger)
UniBasel Contributors:Hamburger, Matthias and Jähne, Evelyn and Eigenmann, Daniela and Moradiafrapoli, Fahimeh and Oufir, Mouhssin and Smiesko, Martin
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Georg Thieme Verlag
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:02 Nov 2017 08:12
Deposited On:02 Nov 2017 08:12

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