当前位置： SCI文献检索 > FISH PHYSIOLOGY AND BIOCHEMISTRY期刊下所有文献 > Glutathione and its related enzymes in the gonad of Nile Tilapia (Oreochromis niloticus).

Glutathione and its related enzymes in the gonad of Nile Tilapia (Oreochromis niloticus).

Abstract：

:Glutathione (GSH) concentration, the activity of its metabolizing enzymes, glutathione transferase (GST), glutathione peroxidase (GPx), glutathione reductase (GR), and the antioxidant enzyme catalase (CAT) in O. niloticus ovary and testis were examined. GSH concentration of O. niloticus testis exhibited high concentration (129 ± 21 nmol/g tissue) compared with GSH concentration (49.2 ± 8.3 nmol/g tissue) in the ovary. GST, GPx, GR, and CAT activities of O. niloticus testis exhibited high values compared with their corresponding values in ovary homogenates. However, protein concentration in ovary homogenates exhibited higher values (175 ± 40.6 mg) compared with testis homogenates (27.1 ± 3.7 mg). O. niloticus ovary was less effective in excretion of xenobiotices compared with the testis, where its function is mainly in increasing the protein content of the eggs; however, in O. niloticus testis, the glutathione cycle operated in accelerated way in the direction of reduced GSH production in order to protect the maturation stages in a save way. A simple reproducible procedure for the purification of GST from O. niloticus ovary was established. The enzymes proved to be homogenous as judged by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), and its molecular weight was calculated to be 25.1 kDa. GST of O. niloticus ovary exhibited maximum activity at pH 7.5. The Michaelis-Menten constant (K(m)) of the purified ovary GST for GSH and CDNB was 0.076 mM and 1.0 mM, respectively. Cibacron blue was the most potent inhibitor of ovary GST activity (IC50 value, concentration of inhibitor that will give 50% inhibition, equal 0.002 μM). The specific activity of GST toward different electrophilic substrates was determined. GST activity toward benzyl isothiocyanate was the highest compared with phenethyl isothiocyanate and allyl isothiocyanate.

journal_name

Fish Physiol Biochem

journal_title

Fish physiology and biochemistry

authors

Hamed RR,Saleh NS,Shokeer A,Guneidy RA,Abdel-Ghany SS

doi

10.1007/s10695-015-0143-9

subject

Has Abstract

pub_date

2016-02-01 00:00:00

pages

353-64

issue

1

eissn

0920-1742

issn

1573-5168

pii

10.1007/s10695-015-0143-9

journal_volume

42

pub_type

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