title: Chloramphenicol influence on antioxidant enzymes with preliminary approach on microsomal CYP1A immunopositive-protein in Chamelea gallina.
abstract: Chloramphenicol (CA) is a largely used antibiotic and it is an inhibitor of protein synthesis that also induces ROS production. In this work there were investigated activities and expressions in the Adriatic bivalve Chamelea gallina of some antioxidant and detoxification proteins like superoxide dismutase (Mn-SOD, Cu/Zn-SOD), catalase (CAT) and Cytochrome P450 (CYP1A). Clams exposed to 5mgl(-1) of chloramphenicol were sampled 2, 4 and 8 days after treatment (CA2, CA4 and CA8). SODs, CAT, and CYP1A activity and/or expression were detected in pooled digestive glands by Western blotting and by spectrophotometrical analysis. Enzymes activities increase during the entire antibiotic exposure. With respect to the control Cu/Zn-SOD expression increases, while Mn-SOD expression decreases significantly after 4 days. Two CYP1A immunopositive-proteins (57.7 and 59.8kDa) were detected. The lower band significantly decreases in CA8, the upper one also in CA4 condition. High levels of Mn-SOD, CAT activity and Cu/Zn-SOD expression, indicate intense ROS production while Mn-SOD expression inhibition might be ascribable to mitochondrial alterations due to CA and indirectly to ROS. CYP1A1 action determines H2O2 production that would contribute to a CYP1A1 gene promoter down regulation, a response to oxidative stress with the antioxidant enzymes activation as a final result. This study highlights the close association, in C. gallina, in presence of chloramphenicol, between SOD/CAT and CYP system, and it appear particularly interesting to the lack of similar researches on mollusc species.
authors.affiliation: Department of Biochemistry G. Moruzzi, University of Bologna, Via Tolara di Sopra 50, 40064 Ozzano Emilia, Bologna, Italy. marta.monari2@unibo.it
authors.forename: M
authors.initials: M
authors.lastname: Monari
authors.forename: J
authors.initials: J
authors.lastname: Foschi
authors.forename: P
authors.initials: P
authors.lastname: Cortesi
authors.forename: R
authors.initials: R
authors.lastname: Rosmini
authors.forename: O
authors.initials: O
authors.lastname: Cattani
authors.forename: G P
authors.initials: GP
authors.lastname: Serrazanetti
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D000975:Antioxidants / Q000378:metabolism*; D049872:Bivalvia / Q000201:enzymology*; D015153:Blotting, Western; D002374:Catalase / Q000378:metabolism*; D002701:Chloramphenicol / Q000494:pharmacology*; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism*; D004591:Electrophoresis, Polyacrylamide Gel; D008861:Microsomes / Q000187:drug effects* / Q000201:enzymology; D013482:Superoxide Dismutase / Q000378:metabolism*
chemical_list: D000900:Anti-Bacterial Agents; D000975:Antioxidants; D002701:Chloramphenicol; D003577:Cytochrome P-450 Enzyme System; D002374:Catalase; D013482:Superoxide Dismutase