title: Modulatory effect of copper on nonenzymatic antioxidants in freshwater fish Channa punctatus (Bloch.).
abstract: Effect of the low level of copper exposure on nonenzymatic antioxidants was studied in a freshwater fish Channa punctatus (Bloch.). Fish were exposed to cupric chloride at the concentration of 10 ppb for 4 wk (28 d) in a static culture condition. Copper significantly (p < 0.001) increased the serum ceruloplasmin level and total iron-binding capacity. A significant (p < 0.05) increase in reduced glutathione level was recorded in all of the tissues. With regard to nonprotein thiols, copper decreased their level in the liver, but increased it in the gill. The protein-bound thiols remained unaltered except for an increase in the liver. Metallothionein (MT) induction was observed in liver only. Copper exposure had no significant effect on the ascorbic acid level and induced no lipid peroxidation over control values. It is suggested that by modulating the ceruloplasmin level, copper indirectly protects the fish, as it facilitates conversion of pro-oxidant iron to nonoxidant iron. It also induces an array of antioxidants that may be beneficial to fish in the case of oxidative stress resulting from chemical pollutants.
authors.affiliation: Department of Medical Elementology, Jamia Hamdard (Hamdard University), New Delhi 110062, India.
authors.forename: Suhel
authors.initials: S
authors.lastname: Parvez
authors.forename: Iqbal
authors.initials: I
authors.lastname: Sayeed
authors.forename: Suwarna
authors.initials: S
authors.lastname: Pandey
authors.forename: Ausaf
authors.initials: A
authors.lastname: Ahmad
authors.forename: Bilal
authors.initials: B
authors.lastname: Bin-Hafeez
authors.forename: Rizwanul
authors.initials: R
authors.lastname: Haque
authors.forename: Iqbal
authors.initials: I
authors.lastname: Ahmad
authors.forename: Sheikh
authors.initials: S
authors.lastname: Raisuddin
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000378:metabolism*; D002570:Ceruloplasmin / Q000378:metabolism; D003300:Copper / Q000494:pharmacology*; D005399:Fishes / Q000378:metabolism*; D005880:Gills / Q000187:drug effects / Q000378:metabolism; D005978:Glutathione / Q000378:metabolism; D007501:Iron / Q000378:metabolism; D007668:Kidney / Q000187:drug effects / Q000378:metabolism; D015227:Lipid Peroxidation / Q000187:drug effects; D008099:Liver / Q000187:drug effects / Q000378:metabolism; D008668:Metallothionein / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism; D013438:Sulfhydryl Compounds / Q000378:metabolism
chemical_list: D000975:Antioxidants; D017382:Reactive Oxygen Species; D013438:Sulfhydryl Compounds; D003300:Copper; D008668:Metallothionein; D007501:Iron; D002570:Ceruloplasmin; D005978:Glutathione