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Identification of potent nontoxic poly(ADP-ribose) polymerase-1 inhibitors: Chemopotentiation and pharmacological studies

Calabrese, CR; Batey, MA; Thomas, HD; Durkacz, BW; Wang, LZ; Kyle, S; Skalitzky, D; ... Curtin, NJ; + view all (2003) Identification of potent nontoxic poly(ADP-ribose) polymerase-1 inhibitors: Chemopotentiation and pharmacological studies. CLIN CANCER RES , 9 (7) 2711 - 2718.

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Abstract

The nuclear enzyme poly(ADP-ribose) polymerase (PARP-1) facilitates DNA repair, and is, therefore, an attractive target for anticancer cherno- and radio-potentiation. Novel benzimidazole-4-carboxamides (BZI-6) and tricyclic lactam indoles (TI1-5) with PARP-1 K-i values of <10 nm have been identified.Whole cell PARP-1 inhibition, intrinsic cell growth inhibition, and chemopotentiation of the cytotoxic agents temozolomide (TM) and topotecan (TP) were evaluated in LoVo human colon carcinoma cells. The acute toxicity of the inhibitors was investigated in PARP-1 null and wild-type mice. Tissue distribution and in vivo chemopotentiation activity was determined in nude mice beating LoVo xenografts.At a nontoxic concentration (0.4 mum) the PARP-1 inhibitors potentiated TM-induced growth inhibition 1.0-5.3-fold and TP-induced inhibition from 1.0-2.1-fold. Concentrations of the PARP-1 inhibitors that alone inhibited cell growth by 50% ranged from 8 to 94 mum. Maximum potentiation of TM activity was achieved at nongrowth inhibitory concentrations (less than or equal to1 mum) of potent PARP-1 inhibitors BZ5 and TI4. Whole cell PARP-1 inhibition by BZ3, BZ5, BZ6, TI1, and TI4 was confirmed by attenuation of DNA damage-induced NAD(+) depletion. Selected inhibitors (TI1, TI3, and TI4), in contrast to the benchmark compound PD128763, caused only mild hypothermia in both PARP-1 null and wild-type mice. Excellent distribution of BZ5, TI1, and TI3 into tumor tissue was observed, and TI3 enhanced TM antitumor activity in vivo.These studies have identified potent nontoxic PARP-1 inhibitors with structural modifications that promote aqueous solubility, tolerability, and tissue distribution. These compounds are important leads in the development of clinically viable PARP-1 inhibitors.

Type: Article
Title: Identification of potent nontoxic poly(ADP-ribose) polymerase-1 inhibitors: Chemopotentiation and pharmacological studies
Keywords: ADP-RIBOSE POLYMERASE, DNA-BINDING DOMAIN, MAMMALIAN-CELLS, CRYSTAL-STRUCTURES, GENE-DISRUPTION, EXCISION-REPAIR, MICE, CYTOTOXICITY, APOPTOSIS, DAMAGE
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Cancer Institute
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Cancer Institute > Research Department of Oncology
URI: http://discovery.ucl.ac.uk/id/eprint/191424
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