Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UNIPROT:P47989 (xanthine oxidase)
 8,633 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

A method for measuring the content of two groups of microsomal cytochrome P-450 isozymes--cytochromes P-450W and P-450L--with the active sites directed into the water phase and membrane lipids, respectively, has been developed. The method is based on the ability of the xanthine oxidase-menadione complex to reduce microsomal cytochromes b5 and P-450 under anaerobic conditions by transferring electrons to hemoproteins with the active sites directed into the water phase. Cytochrome b5 is completely reduced (to the dithionite level) and cytochrome P-450 is reduced partially (only a group of cytochromes P-450W). The amount of cytochromes P-450L is estimated using the difference between the total content of cytochrome P-450 reduced by sodium dithionite and the content of cytochromes P-450W. The possibility of controlling the ratio of these two isozyme groups in cytochrome P-450 in vivo in membranes of the endoplasmic reticulum by pretreatment of animals with a variety of chemicals has been demonstrated. The ratio of cytochromes P-450W and P-450L has been shown to decrease two-fold 18 days after three injections of phenobarbital into mice. Carbon tetrachloride and cyclophosphamide also decrease this ratio in vivo.
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PMID:The ratio of two isozyme groups in microsomal cytochrome P-450 under exogenous influence of carbon tetrachloride and cyclophosphamide. 323 47