Removal of fibroblastoid cells from primary monolayer cultures of rat neonatal endocrine pancreas by sodium ethylmercurithiosalicylate |
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Authors: | J T Braaten M J Lee A Schenk D H Mintz |
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Affiliation: | Department of Biology, Faculty of Science, Kyushu University Fukuoka 812, Japan |
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Abstract: | Anti-cytochrome b5 immunoglobulin (AIg) from a rabbit was used to establish the role of cytochrome b5 in the transfer of electrons from NADH or NADPH to the hepatic microsomal mono-oxidase system of the rat. AIg inhibited ethylmorphine (EM) N-demethylase when both NADH and NADPH were present, but had little effect when NADPH was the only source of electrons. Inhibition was reversed when AIg was preincubated with pure cytochrome b5. Specificity of AIg was shown by its inhibitory effect on NADH cytochrome c reductase activity; it was without effect on NADPH-cytochrome P-450 reductase or aniline hydroxylase activities. It is concluded that the second electron required for EM N-demethylation can be donated by NADH via cytochrome b5. |
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