Diapocynin versus apocynin as pretranscriptional inhibitors of NADPH oxidase and cytokine production by peripheral blood mononuclear cells


Autoria(s): Kanegae, Marilia P. P.; Condino-Neto, Antonio; Pedroza, Luis Alberto; de Almeida, Ana Carolina; Rehder, Jussara; da Fonseca, Luiz Marcos; Ximenes, Valdecir Farias
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

20/05/2014

20/05/2014

12/03/2010

Resumo

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Apocynin has been extensively used as an inhibitor of NADPH oxidase (NOX) in many experimental models using phagocytic and non-phagocytic cells. Currently, there is some controversy about the efficacy of apocynin in non-phagocytic cells, but in phagocytes the reported results are consistent, which could be due to the presence of myeloperoxidase in these cells. This enzyme has been proposed as responsible for activating apocynin by generating its dimer, diapocynin, which is supposed to be the active compound that prevents NADPH oxidase complex assembly and activation.Here, we synthesized diapocynin and studied its effect on inhibition of gp91(phox) RNA expression. We found that diapocynin strongly inhibited the expression of gp91(phox)mRNA in peripheral blood mononuclear cells (PBMC). Only at a higher concentration, apocynin was able to exert the same effect. We also compared the apocynin and diapocynin efficacy as inhibitors of tumor necrosis factor-alpha (TNF-alpha) and interleukin-10 (IL-10) production in response to lipopolysaccharide (LPS)-activated PBMC. Although apocynin did inhibit TNF-alpha production, diapocynin had a much more pronounced effect, on both TNF-alpha and IL-10 production. In conclusion, these findings suggest that the bioconversion of apocynin to diapocynin is an important issue not limited to enzymatic activity inhibition, but also for other biological effects as gp91(phox) mRNA expression and cytokine production. Hence, as diapocynin can be easily prepared from apocynin, a one-step synthesis, we recommend its use in studies where the biological effects of apocynin are searched. (C) 2010 Elsevier B.V. All rights reserved.

Formato

551-554

Identificador

http://dx.doi.org/10.1016/j.bbrc.2010.02.073

Biochemical and Biophysical Research Communications. San Diego: Academic Press Inc. Elsevier B.V., v. 393, n. 3, p. 551-554, 2010.

0006-291X

http://hdl.handle.net/11449/7332

10.1016/j.bbrc.2010.02.073

WOS:000275978400039

Idioma(s)

eng

Publicador

Academic Press Inc. Elsevier B.V.

Relação

Biochemical and Biophysical Research Communications

Direitos

closedAccess

Palavras-Chave #Apocynin #Diapocynin #NADPH oxidase #TNF-alpha #IL-10 #gp91(phox)
Tipo

info:eu-repo/semantics/article