Effects of dichlorvos and characterization of microsomal NADPH-cytochrome P450 and NADH-ferricyanide reductase in rainbow trout (Oncorhynchus mykiss) liver

Özen T., Korkmaz H.

ISRAELI JOURNAL OF AQUACULTURE-BAMIDGEH, vol.56, no.1, pp.35-44, 2004 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 56 Issue: 1
  • Publication Date: 2004
  • Journal Name: ISRAELI JOURNAL OF AQUACULTURE-BAMIDGEH
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.35-44
  • Keywords: DDVP, microsomes, NADPH-cytochrome P450 reductase, NADH-ferricyanide reductase, Oncorhynchus mykiss, ISOLATED RAT HEPATOCYTES, AROMATASE INHIBITORS, IN-VITRO, SOLUBILIZATION, PURIFICATION, FORMS
  • Ondokuz Mayıs University Affiliated: Yes

Abstract

The kinetics of oxidation of rainbow trout (Oncorhynchus mykiss) NADPH-cytochrome P450 reductase (NCPR) by cytochrome-c and NADH-ferricyanide reductase (NFR) by K3Fe(CN)(6) were studied. NCPR and NFR activities from liver microsomes of rainbow trout (Oncorhynchus mykiss) had a specific activity of 0.0246 and 0.0350 nmoles/min/mg protein, respectively. The maximal rate of NCPR reaction was found at cytochrome-c concentrations above 2.1 mM and in the presence of cyt c. V-max and K-m were 0.0083 nmoles/min/mg and 1.14 mM. The maximal rate of NFR reaction was at K3Fe(CN)6 concentrations higher than 2.0 mM and in the presence of K3Fe(CN)(6). V-max and K-m values were 1.04 nmoles/min/mg and 0.352 mM, respectively. The inhibition by dichlorvos (DDVP) on NCPR and NFR activity was not exhibited over the range 1.0-5.0 mM DDVP.