当前位置： SCI文献检索 > FISH PHYSIOLOGY AND BIOCHEMISTRY期刊下所有文献 > The cytochrome P450 system of atlantic salmon (Salmo salar): I. Basal properties and induction of P450 1A1 in liver of immature and mature fish.

The cytochrome P450 system of atlantic salmon (Salmo salar): I. Basal properties and induction of P450 1A1 in liver of immature and mature fish.

Abstract：

:The major components of the cytochrome P450 (P450) system in liver microsomes of Atlantic salmon were studied using spectrophotometric, catalytic and immunochemical techniques. In juvenile fish sampled during the winter season, high basal activities of 7-ethoxyresorufin O-deethylase (EROD) were found. The Km for 7-ethoxyresorufin was 0.4 µM, and Vmax 1.23 nmol/min/mg protein in juvenile fish. In mature fish sampled from the same group of fish in December, EROD activity was barely detectable (20-30 pmol/min/mg protein). Treatment with the P450 1A1 inducer β-naphthoflavone (BNF) resulted in almost 2-fold induction of total P450, and 30-40-fold induction of EROD activity in immature fish. A similar fold increase was seen in mature fish. The differences in EROD activity between untreated and BNF-treated fish, was accompanied by similar differences in a P450 1A1 cross-reacting protein (Mr=58,000 D) in immunochemical studies using rabbit anti-cod P450 1A1 IgG. However, judging from these studies, the levels of P450 1A1-protein in mature salmon far exceeded those accounted for by the measured EROD activity in comparison to immature fish (both before and after BNF-treatment), indicating inhibiting effects of sex steroids on the measured activity. This effect was not seen on 7-ethoxycoumarin O-deethylase activity. A long-term storage experiment indicated that Atlantic salmon liver microsomes can be stored for 2 years at -80°C in 20% glycerol without losing more than 20-40% of its catalytic activity.

journal_name

Fish Physiol Biochem

journal_title

Fish physiology and biochemistry

authors

Goksøyr A,Larsen HE

doi

10.1007/BF02265154

subject

Has Abstract

pub_date

1991-12-01 00:00:00

pages

339-49

issue

4

eissn

0920-1742

issn

1573-5168

journal_volume

9

pub_type

杂志文章

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