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S Imaoka, K Enomoto, Y Oda, A Asada, M Fujimori, T Shimada, S Fujita, FP Guengerich and Y Funae
Laboratory of Chemistry, Osaka City University Medical School, Japan.
The metabolism of lidocaine by human hepatic microsomes and purified human cytochrome P-450s, P-450NF (P450IIIA4), P-450MP (a P450IIC form) and P-450PA (P450IA2) was examined and their metabolism was compared with that by rat hepatic cytochrome P-450s. Human hepatic microsomes produced monoethylglycinexylidide (MEGX) and 3-hydroxylidocaine (3-OH- LID) from lidocaine. In a reconstituted system with dilauroylphosphatidylcholine, P-450NF efficiently produced MEGX. P- 450PA was not efficient in lidocaine N-deethylation (formation of MEGX) but produced 3-OH-LID. P-450NF and P-450MP did not produce 3-OH-LID. Lidocaine N-deethylation activity of P-450NF was enhanced in a modified reconstituted system with a phospholipid mixture and sodium cholate. P- 450NF appears to be an ortholog to rat P450 PB-1 (P450IIIA2). Anti-P450 PB-1 antibody cross-reacted with P-450NF and efficiently inhibited lidocaine N-deethylation in human hepatic microsomes. The correlation of lidocaine N-deethylation activity with the concentration of P-450NF determined immunochemically with anti-P450 PB-1 antibody was good (r = 0.81). In addition, correlation between P-450NF content estimated with anti-P450 PB-1 and anti-P-450NF preparations was good (r = 0.96). These results suggest that rat P450 PB-1 and human P-450NF have closely related properties and P-450NF is the major enzyme involved in lidocaine N-deethylation in human hepatic microsomes.
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