Poly(ADP-ribose) polymerase-1 (PARP-1) and its therapeutic implications

Vascular Pharmacology
Rupinder K SodhiAmteshwar S Jaggi

Abstract

Poly(ADP-ribose) polymerases (PARPs) are a family of cell signaling enzymes present in eukaryotes, which are involved in the poly(ADP-ribosylation) of DNA binding proteins. While an 18 member superfamily of PARPs has been identified, however PARP-1 the most abundant isoform accounts for more than 90% of its functions. PARP-1 works as DNA damage nick sensor, which uses NAD(+) to form polymers of ADP-ribose (PAR) and nicotinamide. Three consequences of the activation of PARP-1 are particularly important for drug development: first, its role in DNA repair; second, its capacity to deplete cellular energetic pools, which culminates in cell dysfunction and necrosis; and third, its capacity to promote the transcription of proinflammatory genes. Consequently, pharmacological inhibition of PARP has the potential to enhance the cytotoxicity of certain DNA-damaging anticancer drugs, reduce cell necrosis (for example, in stroke or myocardial infarction) and downregulate multiple simultaneous pathways of inflammation and tissue injury (for example, in circulatory shock, colitis or diabetic complications). Through this article we have tried to develop a brief and simplified picture of the principal physiological and pathophysiological roles ...Continue Reading

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