Regulation of p21Waf1 expression and TNF alpha(biosynthesis by glutathione modulators in PMA induced-THP1 differentiation: Involvement of JNK and ERK pathways

Regulation of p21Waf1 expression and TNF alpha(biosynthesis by glutathione modulators in PMA induced-THP1 differentiation: Involvement of JNK and ERK pathways

Author Debbas, Victor Google Scholar
Arai, Roberto J. Google Scholar
Ferderbar, Simone Google Scholar
Schindler, Fernanda Google Scholar
Stern, Arnold Google Scholar
Monteiro, Hugo P. Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Universidade de São Paulo (USP)
NYU
Abstract Oxidative modifications of proteins are fundamental biochemical events that regulate cellular signaling, protein expression, and function. the redox status is balanced by reductants in which GSH plays a major role. This study investigated whether or not p21Waf1 expression and TNF alpha biosynthesis in macrophage differentiation/activation were regulated by GSH modulators and whether or not the JNK and ERK pathway were involved. We observed an increase of p21Waf1 expression and TNF alpha biosynthesis in the THP1 monocyte/macrophage cell line treated with PMA. Treatment of THP1 cultures with NAC prior to adding PMA abrogates the expression of p21Waf1 mRNA and decreases the level of TNF alpha whereas GSH depletion by BSO enhances the levels of TNF alpha with minor effects on p21Waf1 expression. To assess whether or not ERK and JNK were involved in the redox mechanism of p21Waf1 and TNF alpha, we used pharmacological inhibitors for JNK and ERK. Both PD98095 and dicoumarol were capable of blocking TNF alpha production but had only a small effect on p21Waf1 expression. We next observed that activation of JNK was significantly inhibited in cells pretreated with NAC with no effect on ERK. Taken together, our findings suggest that the modulation of GSH regulate the magnitude the cell response to PMA in which JNK and ERK have a particular role in redox signaling, (C) 2007 Elsevier Inc. All rights reserved.
Keywords redox signaling
ERK
JNK
p21Waf1
TNF alpha
Language English
Date 2007-11-30
Published in Biochemical and Biophysical Research Communications. San Diego: Academic Press Inc Elsevier Science, v. 363, n. 4, p. 965-970, 2007.
ISSN 0006-291X (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 965-970
Origin http://dx.doi.org/10.1016/j.bbrc.2007.09.091
Access rights Closed access
Type Article
Web of Science ID WOS:000250456400015
URI http://repositorio.unifesp.br/handle/11600/30154

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