Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/54338
Type: Artigo de periódico
Title: An Asp49 Phospholipase A(2) from Snake Venom Induces Cyclooxygenase-2 Expression and Prostaglandin E-2 Production via Activation of NF-kappa B, p38MAPK, and PKC in Macrophages
Author: Moreira, V
Lomonte, B
Vinolo, MAR
Curi, R
Gutierrez, JM
Teixeira, C
Abstract: Phospholipases A(2) (PLA(2)) are key enzymes for production of lipid mediators. We previously demonstrated that a snake venom sPLA(2) named MT-III leads to prostaglandin (PG)E-2 biosynthesis in macrophages by inducing the expression of cyclooxygenase-2 (COX-2). Herein, we explored the molecular mechanisms and signaling pathways leading to these MT-III-induced effects. Results demonstrated that MT-III induced activation of the transcription factor NF-kappa B in isolated macrophages. By using NF-kappa B selective inhibitors, the involvement of this factor in MT-III-induced COX-2 expression and PGE(2) production was demonstrated. Moreover, MT-III-induced COX-2 protein expression and PGE(2) release were attenuated by pretreatment of macrophages with SB202190, and Ly294002, and H-7-dihydro compounds, indicating the involvement of p38MAPK, PI3K, and PKC pathways, respectively. Consistent with this, MT-III triggered early phosphorylation of p38MAPK, PI3K, and PKC. Furthermore, SB202190, H-7-dihydro, but not Ly294002 treatment, abrogated activation of NF-kappa B induced by MT-III. Altogether, these results show for the first time that the induction of COX-2 protein expression and PGE(2) release, which occur via NF-kappa B activation induced by the sPLA(2)-MT-III in macrophages, are modulated by p38MAPK and PKC, but not by PI3K signaling proteins.
Country: EUA
Editor: Hindawi Publishing Corporation
Rights: aberto
Identifier DOI: 10.1155/2014/105879
Date Issue: 2014
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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