Details

Autor(en) / Beteiligte

• Kraul, H.
• Pasanen, M.
• Sigusch, H.
• Stenbäck, F.
• Park, S-S.
• Gelboin, HV
• Pelkonen, O.

Titel

Immunohistochemical properties of dipyrone-induced cytochromes P450 in rats

Ist Teil von

• Human & experimental toxicology, 1996-01, Vol.15 (1), p.45-50

Ort / Verlag

Thousand Oaks, CA: SAGE Publications

Erscheinungsjahr

1996

Quelle

MEDLINE

Beschreibungen/Notizen

• 1 Rat hepatic cytochrome P450s induced by dipyrone were studied enzymatically, immunochemically and immunohistochemically. 2 Dipyrone administered to male Wistar rats increased pentoxyresorufin O-depentylation (PROD), ethoxyresor ufin O-deethylation (EROD) and 7-ethoxycoumarin O- deethylation (ECOD) activities up to 44-, 1.9-, and 2.6-fold, respectively. Aryl hydrocarbon hydroxylase (AHH) activ ity was not affected. 3 Immunoinhibition with the monoclonal antibody (Mab) 2-66-3 (to CYP2B1/2) markedly decreased PROD and EROD activities, but not AHH activity. The Mab 1-7-1 (to CYP1A1/2) was without effect. 4 Histochemically, the Mab 2-66-3 gave a strong and uniform staining in livers from dipyrone-treated rats, whereas the Mab 1-7-1 gave a positive reaction in a narrow perivenous strip. 5 The induction pattern as well as inhibition by the Mabs convincingly demonstrate the predominant production of CYP2B1/2 in the induction spectrum of dipyrone. The increase in enzyme activities other than PROD may be due to the overlapping substrate specificity of CYP2B1/2 enzymes. The immunohistochemical analysis also indi cated the participation of CYP1A1/2.