Résumé
The parenteral administration of alpha-lipoic acid (LA) protected against chromate induced oxidative stress in mouse liver. A shift in Cr induced pro-oxidant state to antioxidant-state by LA was noteworthy. The degree of protection was significant and similar in different LA administration regimens (prior-, co- and post- parenteral Cr exposure) explored. An improved status of the tissue antioxidants by LA appeared to be the mechanism of mitigation. The results are of chemopreventive value and suggest a possible alternative to ascorbic acid for abrogation of Cr toxicity.
Sujets)
Animaux , Antioxydants/pharmacologie , Carbone/composition chimique , Catalase/métabolisme , Chromates/pharmacologie , Chrome/composition chimique , Glutathion/métabolisme , Glutathione reductase/métabolisme , Peroxydation lipidique , Foie/métabolisme , Mâle , Souris , Oxydants/métabolisme , Stress oxydatif , Oxygène/métabolisme , Dichromate de potassium/composition chimique , Superoxide dismutase/métabolisme , Acide lipoïque/composition chimique , Facteurs tempsRésumé
High selectivity provided by biomolecules such as antibodies and enzymes has been exploited during the last two decades for development of biosensors. Of particular importance are efficient immobilization methods for biomolecules in order to preserve their biological activities. In this study, we have evaluated immobilization strategies for an anti-DNA antibody on a self-assembled monolayer of omega-functionalized thiols. The antibody was immobilized via peptide bond formation between the primary amines in the antibody and the carboxyl groups on the self-assembled monolayer. The peptide bond coupling was achieved by activating COOH groups on the surface through N-Hydroxysuccimide (NHS)-ester formation, followed by acylation of NH2 group in the antibody. DNA binding activity of the immobilized antibody was examined by counting beta emission from 35S-labeled DNA.