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Effect of vitamin D on ABCB1 and CYP3A4 expression in human precision-cut intestinal slices
Mazurová, Tereza ; Vokřál, Ivan (advisor) ; Matoušková, Petra (referee)
Charles University Faculty of Pharmacy in Hradec Králové Department of Pharmacology and Toxicology Student: Tereza Mazurová Supervisor: PharmDr. Ivan Vokřál, Ph.D. Title of diploma thesis: Effect of vitamin D on the expression of ABCB1 and CYP3A4 in human intestinal slices When drugs are administered orally, their absorption is significantly affected by the intestinal barrier. This barrier expresses a variety of efflux and uptake transporters, as well as first and second-phase biotransformation enzymes. The most important efflux transporter in the intestinal barrier is P-glycoprotein, which has a broad substrate specificity. Among the first-phase biotransformation enzymes, cytochrome P450 3A4 is the most important. Their function is to protect the human body from the toxic effects of xenobiotics, including drugs. Many clinically important drugs act as substrates, inhibitors or inducers in relation to these proteins, which may result in an increased risk of drug interactions. A plethora of dietary supplements or medicines containing vitamin D can be found in the pharmacy. It is used for the proper development of bones and teeth, for the proper function of the immune system or for the treatment of osteomalacia, rickets or osteoporosis. Limited information is available on its effects on P-gp and...
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