Effect of silybin and its glycosides on the expression of cytochromes P450 1A2 and 3A4 in primary cultures of human hepatocytes.
Four beta-glycosides of flavonoligan silybin, i.e. silybin beta-galactoside, silybin beta-glucoside, silybin beta-maltoside, silybin beta-lactoside were synthesized in order to improve silybin water solubility and bioavailability (Kren et al., J Chem Soc, Perkin Trans 1, 2467-2474, 1997). The presented paper deals with the effect of silybin and its synthetic beta-glycosides on the expression of two major cytochrome P450 isoforms, CYP1A2 and CYP3A4. Primary cultures of human hepatocytes were the model of choice. mRNAs were analyzed using Northern blot and P-radiolabelled probes. CYP protein content was determined by immunoblotting using specific antibodies. Silybin and its beta-glycosides do not induce expression of CYP1A2 and CYP3A4. Tested compounds did not affect inducible expression of CYP1A2 and CYP3A4 by dioxin and rifampicin, respectively, as evaluated at the level of mRNAs and proteins. Silybin and its beta-glycosides do not interfere with the expression of CYP1A2 and CYP3A4, are not likely to produce drug-drug interactions in terms of the inducibility of two important cytochromes P450.
Institute of Medical Chemistry and Biochemistry, Faculty of Medicine, Palacký University Olomouc, Hnevotínská 3, 77515 Olomouc, Czech Republic.
Pavel
P
Kosina
Patrick
P
Maurel
Jitka
J
Ulrichová
Zdenek
Z
Dvorák
D001189:Aryl Hydrocarbon Hydroxylases / Q000378:metabolism*; D002478:Cells, Cultured; D019388:Cytochrome P-450 CYP1A2 / Q000378:metabolism*; D051544:Cytochrome P-450 CYP3A; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects*; D006027:Glycosides / Q000737:chemistry / Q000494:pharmacology*; D022781:Hepatocytes / Q000187:drug effects* / Q000201:enzymology*; D006801:Humans; D015394:Molecular Structure; D010089:Oxidoreductases, N-Demethylating / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics; D000077385:Silybin; D012838:Silymarin / Q000737:chemistry / Q000494:pharmacology
D006027:Glycosides; D012333:RNA, Messenger; D012838:Silymarin; D000077385:Silybin; D001189:Aryl Hydrocarbon Hydroxylases; D019388:Cytochrome P-450 CYP1A2; D051544:Cytochrome P-450 CYP3A; D010089:Oxidoreductases, N-Demethylating