Inhibition of poly(ADP-ribose) glycohydrolase by gallotannin selectively up-regulates expression of proinflammatory genes

Molecular Pharmacology
Elena RapizziAlberto Chiarugi

Abstract

Poly(ADP-ribose)-polymerase-1 (PARP-1) and poly(ADP-ribose) (PAR) are emerging key regulators of chromatin superstructure and transcriptional activation. Accordingly, both genetic inactivation of PARP-1 and pharmacological inhibition of PAR formation impair the expression of several genes, including those of the inflammatory response. In this study, we asked whether poly(ADP-ribose) glycohydrolase (PARG), the sole depoly(ADP-ribosyl)ating enzyme identified so far, also regulates gene expression. We report the novel finding that inhibition of PARG by gallotannin triggered nuclear accumulation of PAR and concomitant PAR-dependent expression of inducible NO synthase (iNOS) and cyclooxygenase-2 (COX-2), but not of interleukin-1beta and tumor necrosis factor-alpha, in cultured RAW 264.7 macrophages. Remarkably, silencing of PARG by means of small interfering RNA selectively impaired gallotannin-induced expression of iNOS and COX-2. Consistent with a PAR-dependent transcriptional activation, increases of iNOS and COX-2 transcripts were not caused by activation of transcription factors such as nuclear factor-kappaB, activator protein-1, signal transducer and activator of transcription-1 or interferon regulatory factor-1, nor by mRNA s...Continue Reading

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