Acetaminophen is a common analgesic and antipyretic compound which, when administered in high doses, has
been associated with significant morbidity and mortality, secondary to hepatic toxicity. Although this may be due to a direct
interaction of reactive acetaminophen metabolites with hepatocyte proteins, recent studies have suggested that reactive
species produced by neutrophils also contribute to the pathophysiological process. Researches on the chemical composition
of B. trimera show that this plant has bioactive compounds such as flavonoids, related to the organism’s protection
against free radicals. Therefore, in the present study, using Fischer rats, the effect of B. trimera on the antioxidant defense
system, the production of nitric oxide (NO) and on the expression of nitric oxide synthase (iNOS), superoxide dismutase
(SOD), catalase (CAT) and of the subunits of the NADPH oxidase in neutrophils was evaluated in a model of
phagocytosis induced by zimosan (ZC3b) and in a model of inflammation induced by acetaminophen. The results show
that the treatment with B. trimera improves the defense system of antioxidant and restores the balance ROS / NO that is
altered in the inflammatory process induced by APAP. In conclusion, B. trimera extracts exert antioxidant properties by
scavenging ROS and decrease the expression of genes responsible by reactive species production in neutrophils.
Keywords: Acetaminophen, Antioxidant enzymes, Baccharis trimera, NADPH oxidase, Neutrophils, qRT-PCR.
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