Article Publish Status: FREE
Abstract Title:

Baccharis trimera inhibits reactive oxygen species production through PKC and down-regulation p47 (phox) phosphorylation of NADPH oxidase in SK Hep-1 cells.

Abstract Source:

Exp Biol Med (Maywood). 2017 Feb ;242(3):333-343. Epub 2016 Oct 7. PMID: 28103717

Abstract Author(s):

Glaucy Rodrigues de Araújo, Ana Carolina Silveira Rabelo, Janaína Serenato Meira, Joamyr Victor Rossoni-Júnior, William de Castro-Borges, Renata Guerra-Sá, Maurício Azevedo Batista, Denise da Silveira-Lemos, Gustavo Henrique Bianco de Souza, Geraldo Célio Brandão, Míriam Martins Chaves, Daniela Caldeira Costa

Article Affiliation:

Glaucy Rodrigues de Araújo


Baccharis trimera, popularly known as"carqueja", is a native South-American plant possessing a high concentration of polyphenolic compounds and therefore high antioxidant potential. Despite the antioxidant potential described for B. trimera, there are no reports concerning the signaling pathways involved in this process. So, the aim of the present study was to assess the influence of B. trimera on the modulation of PKC signaling pathway and to characterize the effect of the nicotinamide adenine dinucleotide phosphate oxidase enzyme (NOX) on the generation of reactive oxygen species in SK Hep-1 cells. SK-Hep 1 cells were treated with B. trimera, quercetin, or rutin and then stimulated or not with PMA/ionomycin and labeled with carboxy H2DCFDA for detection of reactive oxygen species by flow cytometer. The PKC expression by Western blot and enzyme activity was performed to evaluate the influence of B. trimera and quercetin on PKC signaling pathway. p47 (phox) and p47 (phox) phosphorylated expression was performed by Western blot to evaluate the influence of B. trimera on p47 (phox) phosphorylation. The results showed that cells stimulated with PMA/ionomycin (activators of PKC) showed significantly increased reactive oxygen species production, and this production returned to baseline levels after treatment with DPI (NOX inhibitor). Both B. trimera and quercetin modulated reactive oxygen species production through the inhibition of PKC protein expression and enzymatic activity, also with inhibition of p47 (phox) phosphorylation. Taken together, these results suggest that B. trimera has a potential mechanism for inhibiting reactive oxygen species production through the PKC signaling pathway and inhibition subunit p47 (phox) phosphorylation of nicotinamide adenine dinucleotide phosphate oxidase.

Study Type : In Vitro Study

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