5-Aminoisoquinolin-1-one (5-AIQ), a Water-Soluble Inhibitor of the Poly(ADP-Ribose)Polymerases (PARPs).

Abstract:

:5-Aminoisoquinolin-1-one (5-AIQ) is a water-soluble inhibitor of the poly(ADPribose) polymerases (PARPs), lacking isoform-selectivity. Although of only moderate potency in vitro against PARP-1, it is highly active in many assays in cells and in models in vivo, indicating excellent uptake. Optimisation of the several synthetic sequences to 5-AIQ has led to development of a short and efficient route from 1-chloroisoquinoline. It has been used widely as a biochemical and pharmacological tool to study the effects of inhibition of the PARPs. It ameliorates the damage to cells and tissues following reperfusion of ischaemic tissue, showing significant protective activity in a rodent model of haemorrhagic shock at the remarkably low dose of 30 µg Kg(-1). Protection is also seen in models of myocardial infarction, ischaemic kidney and liver disorders, stroke and organ transplantation. Inhibition of PARP-1 by 5-AIQ causes down-regulation of the activity of NF-κB, which then down-regulates the expression of several gene products. Thus 5-AIQ has anti-inflammatory activity in vivo, through modulating the expression of cytokines and adhesion molecules. This indirect inhibition of expression is relevant in the activity of 5-AIQ in models of arthritis, Parkinson's disease, multiple sclerosis, spinal cord injury, periodontitis and inflammatory conditions of the lung. Inhibition of expression of matrix metalloproteinases and other factors gives rise to anti-angiogenic activity and to remarkable anti-metastatic activity in a mouse model. Thus, although it has been overtaken by other PARP-inhibiting drugs in the oncological clinic, 5-AIQ remains a valuable tool to study the roles of PARPs in health and in diverse diseases.

journal_name

Curr Med Chem

authors

Threadgill MD

doi

10.2174/0929867322666151002110602

subject

Has Abstract

pub_date

2015-01-01 00:00:00

pages

3807-29

issue

33

eissn

0929-8673

issn

1875-533X

pii

CMC-EPUB-70831

journal_volume

22

pub_type

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