Binding and distribution of three prototype calcium channel blockers in perfused rat liver View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1997-04

AUTHORS

Anwar B. Bikhazi, Khalil M. Bitar, Sawsan I. Kreydiyyeh, Rima S. Saleh, Muna M. El-Kasti, Mohamad Z.M. Ibrahim, Omran R. Abul Khoudoud

ABSTRACT

This work represents a study of the binding and distribution of three different calcium channel blockers in the Sprague-Dawley rat liver, using an in situ perfusion technique. For this purpose, [3H] desmethoxyverapamil, [3H] PN200-110 (isradipine) and [3H] azidopine were used as binding probes interacting with calcium channels. The perfusion steps of the liver involved both portal vein and thoracic inferior vena cava cannulations as inlet and outlet respectively. The subhepatic inferior vena cava was ligated to prevent leakage of the perfusate. Buffer, containing the tracer drug, was administered via the portal vein at a rate of 1 mL/min and perfusate collected at the same rate within specified time intervals during 50 min. The concentration of the tracer solutes in the perfusate's outlet increased with time, and steady state was observed for all tracers at > or = 40 min. The effect of adding cold isradipine to tracer desmethoxyverapamil, or cold verapamil to tracer PN200-110 were also assessed. First order rate constants for hepatocellular influx, efflux and calcium channel binding of the tracer substances were obtained using a simplified model from Goresky et al. These constants were mathematically manipulated and changed into permeability constants, second order binding constants, and residency times. Tracer solute influx across hepatocellular membranes is solubility-diffusion controlled, is inversely related to the molecular weights and is different in value from the efflux constants. Cold isradipine reduced the binding constant of desmethoxyverapamil by 36%, while cold verapamil reduced the binding constant of PN200-110 by 23%. Azidopine cellular distribution was low, however, binding to its receptor was analogous to desmethoxyverapamil and PN200-110. Moreover, PN200-110 had the highest residency time with no effect of cold verapamil on its receptor binding, while desmethoxyverapamil had the lowest residency time which significantly increased in the presence of cold isradipine. More... »

PAGES

1-11

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/a:1006879823866

DOI

http://dx.doi.org/10.1023/a:1006879823866

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1013937813

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/9089625


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