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Lookup NU author(s): Huw Thomas,
Professor Nicola Curtin
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
Therapeutic inhibition of poly(ADP-ribose) polymerase (PARP), as monotherapy or to supplement the potencies of other agents, is a promising strategy in cancer treatment. We previously reported that the first PARP inhibitor to enter clinical trial, rucaparib (AG014699), induced vasodilation in vivo in xenografts, potentiating response to temozolomide. We now report that rucaparib inhibits the activity of the muscle contraction mediator myosin light chain kinase (MLCK) 10-fold more potently than its commercially available inhibitor ML-9. Moreover, rucaparib produces additive relaxation above the maximal degree achievable with ML-9, suggesting that MLCK inhibition is not solely responsible for dilation. Inhibition of nitric oxide synthesis using L-NMMA also failed to impact rucaparib's activity. Rucaparib contains the nicotinamide pharmacophore, suggesting it may inhibit other NAD+-dependent processes. NAD+ exerts P2 purinergic receptor-dependent inhibition of smooth muscle contraction. Indiscriminate blockade of the P2 purinergic receptors with suramin abrogated rucaparib-induced vasodilation in rat arterial tissue without affecting ML-9-evoked dilation, although the specific receptor subtypes responsible have not been unequivocally identified. Furthermore, dorsal window chamber and real time tumor vessel perfusion analyses in PARP-1(-/-) mice indicate a potential role for PARP in dilation of tumor-recruited vessels. Finally, rucaparib provoked relaxation in 70% of patient-derived tumor-associated vessels. These data provide tantalising evidence of the complexity of the mechanism underlying rucaparib-mediated vasodilation.
Author(s): McCrudden CM, O'Rourke MG, Cherry KE, Yuen HF, O'Rourke D, Babur M, Telfer BA, Thomas HD, Keane P, Nambirajan T, Hagan C, O'Sullivan JM, Shaw C, Williams KJ, Curtin NJ, Hirst DG, Robson T
Publication type: Article
Publication status: Published
Journal: PLoS One
Online publication date: 17/02/2015
Acceptance date: 05/01/2015
Date deposited: 01/05/2015
ISSN (print): 1932-6203
Publisher: Public Library of Science
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