2009
Kinetic study of cytochrome P450 2C9 reaction with diclofenac by MEKC combined with a sweeping technique
ŘEMÍNEK, Roman, Jiří KONEČNÝ a Zdeněk GLATZZákladní údaje
Originální název
Kinetic study of cytochrome P450 2C9 reaction with diclofenac by MEKC combined with a sweeping technique
Název česky
Kinetická studie reakce cytochromu P450 2C9 s diclofenacem pomocí sweeping-MEKC kombinace
Autoři
ŘEMÍNEK, Roman, Jiří KONEČNÝ a Zdeněk GLATZ
Vydání
Innsbruck, Rakousko, Proceedeing of XVI. Euroanalysis symposium, od s. 310-310, 1 s. 2009
Nakladatel
Congress and Messe Innsbruck GMbH
Další údaje
Jazyk
angličtina
Typ výsledku
Stať ve sborníku
Obor
10600 1.6 Biological sciences
Stát vydavatele
Rakousko
Utajení
není předmětem státního či obchodního tajemství
Organizační jednotka
Přírodovědecká fakulta
Klíčová slova česky
cytochrom P450 2C9; diclofenac; sweeping; MEKC;
Klíčová slova anglicky
cytochrome P450 2C9; diclofenac; sweeping; MEKC;
Příznaky
Mezinárodní význam, Recenzováno
Změněno: 9. 4. 2010 09:10, prof. RNDr. Zdeněk Glatz, CSc.
V originále
The early knowledge about the metabolism of a new drug and its affinity to certain drug-metabolising enzymes are especially important in the drug development process. The drug discovery thus continually creates a demand for a development of a new generation of high throughput assays. The majority of these studies are oriented on cytochromes P450 (CYP) because these enzymes play a key role in drug metabolism at human. The aim of this work was to demonstrate the possibility of using MEKC for kinetic study of CYP2C9, one of the most important isoforms in human liver, with diclofenac as a probe substrate. In view of the fact that several studies showed that diclofenac hydroxylation deviated slightly from typical Michaelis-Menten kinetics at low substrate concentration, the combination of sweeping with MEKC was applied in this study. The enzymatic reaction thus could be simply monitored by the analysis of the reaction mixture without any pre-treatment; moreover high sensitivity and repeatability of the separations were preserved. A 50 um fused silica capillary (56 cm effective length) was used to carry out all separations. 60 mM SDS in 20 mM phosphate 20 mM tetraborate buffer pH 8.6 was used as BGE. Injection was accomplished by an application of 50 mbar pressure to the sample vial for 48 s. Separation was performed at 24 kV (positive polarity), with the temperature of capillary 25 oC and detection at 200 nm. As the result Michaelis constant 4.62 uM, maximum reaction velocity 18.35 nmol.min-1.nmol-1 and Hill coefficient 1.22 were determined, which were in agreement with the literature data. Value of Hill coefficient confirms a presence of weak positive cooperativity in low substrate concentration region. The explanation could be found in binding of two substrates in or near the active site of CYP2C9.
Česky
Byla provedena kinetická studie reakce cytochromu P450 2C9 s diclofenacem pomocí sweeping-MEKC kombinace.
Návaznosti
LC06023, projekt VaV |
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MSM0021622413, záměr |
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