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dc.contributor.authorHanafy, A
dc.contributor.authorOkyar, Alper
dc.contributor.authorRadschuweit, A
dc.contributor.authorTerhaag, B
dc.contributor.authorAder, P
dc.contributor.authorLangguth, P
dc.contributor.authorSpahn-Langguth, H
dc.contributor.authorBaktir, G
dc.date.accessioned2021-03-03T08:01:53Z
dc.date.available2021-03-03T08:01:53Z
dc.date.issued1998
dc.identifier.citationSpahn-Langguth H., Baktir G., Radschuweit A., Okyar A., Terhaag B., Ader P., Hanafy A., Langguth P., "P-glycoprotein transporters and the gastrointestinal tract: Evaluation of the potential in vivo relevance of in vitro data employing talinolol as model compound", INTERNATIONAL JOURNAL OF CLINICAL PHARMACOLOGY AND THERAPEUTICS, cilt.36, sa.1, ss.16-24, 1998
dc.identifier.issn0946-1965
dc.identifier.othervv_1032021
dc.identifier.otherav_153ecce5-653d-4542-a5d8-e9934e10d09a
dc.identifier.urihttp://hdl.handle.net/20.500.12627/19661
dc.description.abstractAmong the different application routes peroral administration remains the one most widely used, Hence, mechanisms affecting p.o. bioavailability are of particular interest, also in drug development, In recent years, intestinal drug Secretion mediated by the multi-drug resistance gene product P-glycoprotein (PEP) has been discovered as a possible mechanism of low and erratic bioavailability, Due to the saturability of this process, a dose-dependent apparent oral clearance may be observed which decreases upon increasing dose, However, in vivo intestinal secretion might be revealed only in the lower or subtherapeutic dose range, in permeability studies with Caco-2 cell monolayers, the MDR-reversing agent verapamil inhibits secretion of P-glycoprotein substrates and, hence, increases apical-to-basolateral permeability. The aim of the rat studies with talinolol presented here was to test the relevance of the intestinal secretion process as well as the extent of inhibition by verapamil in ex vivo, in situ, and in vivo talinolol/verapamil drug-drug interaction studies. Intestinal secretion of talinolol was detected indirectly in ex vivo studies via transport inhibition with verapamil and directly in in situ intestinal perfusions in rats following a talinolol i.v. bolus. Both i.v, and p.o. verapamil appear to affect the concentration-time profiles of talinolol. Relevant observations with respect to drug absorption are the decreased apparent oral clearance upon verapamil coadministration as well as the decreased t(max) and mean absorption times at high verapamil doses. Talinolol may be regarded as a potential model compound for mechanistic studies on Pgp interactions, including permeability as well as binding studies and the involvement of transporters other than Pgp.
dc.language.isoeng
dc.subjectYaşam Bilimleri
dc.subjectTemel Bilimler
dc.subjectEczacılık
dc.subjectTemel Eczacılık Bilimleri
dc.subjectSağlık Bilimleri
dc.subjectYaşam Bilimleri (LIFE)
dc.subjectFarmakoloji ve Toksikoloji
dc.subjectFARMAKOLOJİ VE ECZACILIK
dc.titleP-glycoprotein transporters and the gastrointestinal tract: Evaluation of the potential in vivo relevance of in vitro data employing talinolol as model compound
dc.typeMakale
dc.relation.journalINTERNATIONAL JOURNAL OF CLINICAL PHARMACOLOGY AND THERAPEUTICS
dc.contributor.department, ,
dc.identifier.volume36
dc.identifier.issue1
dc.identifier.startpage16
dc.identifier.endpage24
dc.contributor.firstauthorID120348


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