title: Effects of exposure to sublethal propiconazole on intestine-related biochemical responses in rainbow trout, Oncorhynchus mykiss.
abstract: The effect of long-term (30 days) exposure to PCZ (0.2, 50, and 500 microg l(-1)) on intestine-related biochemical markers in rainbow trout was investigated. Multiple biomarkers were measured, including digestive enzymes (proteolytic enzymes and amylase), antioxidant responses (TBARS, CP, SOD, CAT, GR and GPx) and energy metabolic parameters (RNA/DNA ratio, Na(+)-K(+)-ATPase). Exposure to 500 microg l(-1) PCZ led to significantly inhibited (p<0.01) proteolytic enzyme and amylase activity. Activities of the antioxidant enzymes SOD, CAT, and GPx gradually increased at lower PCZ concentrations (0.2 and 50 microg l(-1)). At the highest concentration (500 microg l(-1)), oxidative stress was apparent as significant higher (p<0.05) lipid peroxidation and protein carbonyls, associated with an inhibition of antioxidant enzymes activity. Moreover, energy metabolic parameters (RNA/DNA ratio, Na(+)-K(+)-ATPase) were significantly inhibited (p<0.01) in the intestines of fish exposed to 500 microg l(-1) PCZ, compared with controls. We suggest that long-term exposure to PCZ could result in several responses in intestine-related biochemical markers, which potentially could be used as indicators for monitoring residual PCZ present in the aquatic environment.
authors.affiliation: University of South Bohemia in Ceske Budejovice, Faculty of Fisheries and Protection of Waters, Research Institute of Fish Culture and Hydrobiology, Zatisi 728/II, 389 25 Vodnany, Czech Republic. zhihuali06@yahoo.com
authors.forename: Zhi-Hua
authors.initials: ZH
authors.lastname: Li
authors.forename: Vladimir
authors.initials: V
authors.lastname: Zlabek
authors.forename: Roman
authors.initials: R
authors.lastname: Grabic
authors.forename: Ping
authors.initials: P
authors.lastname: Li
authors.forename: Jana
authors.initials: J
authors.lastname: Machova
authors.forename: Josef
authors.initials: J
authors.lastname: Velisek
authors.forename: Tomas
authors.initials: T
authors.lastname: Randak
mesh_terms: D000681:Amylases / Q000378:metabolism; D000818:Animals; D000975:Antioxidants / Q000378:metabolism; D015415:Biomarkers / Q000032:analysis; D004305:Dose-Response Relationship, Drug; D007413:Intestinal Mucosa / Q000378:metabolism; D007422:Intestines / Q000187:drug effects*; D015227:Lipid Peroxidation / Q000187:drug effects; D017686:Oncorhynchus mykiss / Q000378:metabolism*; D018384:Oxidative Stress; D010447:Peptide Hydrolases / Q000378:metabolism*; D050050:Protein Carbonylation / Q000187:drug effects; D014230:Triazoles / Q000494:pharmacology*; D014874:Water Pollutants, Chemical / Q000494:pharmacology*
chemical_list: D000975:Antioxidants; D015415:Biomarkers; D014230:Triazoles; D014874:Water Pollutants, Chemical; C045950:propiconazole; D000681:Amylases; D010447:Peptide Hydrolases