Title |
Poly(ADP-ribose) Polymerase is a Regulator of Chemokine Production: Relevance for the Pathogenesis of Shock and Inflammation
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Published in |
Molecular Medicine, May 2002
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DOI | 10.1007/bf03402154 |
Pubmed ID | |
Authors |
György Haskó, Jon G. Mabley, Zoltán H. Németh, Pál Pacher, Edwin A. Deitch, Csaba Szabó |
Abstract |
Chemokines are key regulators of leukocyte traffic in various forms of inflammation and reperfusion injury. There is emerging evidence that the activation of the nuclear enzyme poly(ADP-ribose) polymerase (PARP) importantly contributes to the up-regulation of a variety of proinflammatory signal transduction pathways and associated genes. We tested whether the expression of the chemokines macrophage inflammatory protein (MIP)-1alpha and MIP-2 are under the control of PARP during inflammation. Pharmacologic inhibition of PARP and genetic deletion of PARP suppressed the expression of MIP-1a and MIP-2 protein and mRNA in immunostimulated cultured murine macrophages and fibroblasts. PARP inhibition also suppressed the activation of NF-kappaB, a key transcription factor known to be involved in the generation of chemokines in immunostimulated cells. In vivo, in various models of local and systemic inflammation, including dextran sodium sulfate-induced colitis and endotoxic shock, pharmacologic inhibition of PARP suppressed the expression of MIP-1alpha and MIP-2. These effects were associated with a marked suppression of the inflammatory response, including an attenuation of neutrophil infiltration into inflamed organs. A combination approach of pharmacologic inhibition and genetic deletion revealed that the major isoform of PARP (PARP-1) plays a predominant, but not exclusive, role in the regulation of chemokine production in vivo. Suppression of chemokine expression may be a novel mode of anti-inflammatory action of PARP inhibition. |
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