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Benyahia C, Ozen G, Orie N, Ledwozyw A, Louedec L, Li F, Senbel AM, Silverstein A, Danel C, Longrois D, Clapp LH, Norel X, Topal G. Ex vivo relaxations of pulmonary arteries induced by prostacyclin mimetics are highly dependent of the precontractile agents. Prostaglandins Other Lipid Mediat 2015; 121:46-52. [PMID: 26362969 DOI: 10.1016/j.prostaglandins.2015.09.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2015] [Revised: 08/18/2015] [Accepted: 09/04/2015] [Indexed: 01/08/2023]
Abstract
Prostacyclin (PGI2) mimetics (iloprost, treprostinil) are potent vasodilators (primarily via IP-receptor activation) and major therapeutic interventions for pulmonary hypertension (PH). Increased plasma levels of endothelin (ET-1), thromboxane (TxA2) and catecholamines have been demonstrated from patients with PH. In this study, we aimed to compare relaxant effects of iloprost and treprostinil on human (HPA) and rat pulmonary arteries precontracted with either ET-1, thromboxane (U46619) or an α-adrenergic receptor agonist (Norepinephrine, NE or phenylephrine, PE). Treprostinil and iloprost induced vasorelaxation of HPA precontracted with NE, ET-1 or U46619. We obtained greater relaxation response and sensitivity to treprostinil when ET-1 or U46619 were used to induce the precontraction in comparison to NE. In contrast, iloprost showed less relaxation response and sensitivity in HPA precontracted with U46619 versus NE. In the rat, treprostinil and iloprost induced vasorelaxation of pulmonary arteries precontracted with PE and U46619 but minimally with ET-1. However, in rat pulmonary arteries, PE-induced precontractions were comparatively low amplitude. Our study showed that the ex vivo relaxation or sensitivity of pulmonary arteries induced by PGI2 mimetics is highly dependent on both the pre-contraction agent and the species. To best extrapolate to effects on human tissue, our results suggest that U46619 is the appropriate contractile agent for assessing the relaxant effect of PGI2 mimetics in rat pulmonary arteries. Finally we suggest that in PH patients with high plasma concentration of TxA2, treprostinil (not iloprost) would be a preferential treatment. On the other hand, if the ET-1 plasmatic level is high, either treprostinil or iloprost will be effective.
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Affiliation(s)
- Chabha Benyahia
- INSERM U1148, CHU X. Bichat, 46 rue H. Huchard, F-75018 Paris, France; Paris Nord University, Sorbonne Paris Cité, UMR-S1148, Paris F-75018, France
| | - Gulsev Ozen
- INSERM U1148, CHU X. Bichat, 46 rue H. Huchard, F-75018 Paris, France; Istanbul University, Faculty of Pharmacy, Department of Pharmacology, Beyazit, 34116 Istanbul, Turkey
| | | | - Agatha Ledwozyw
- Department of Medicine, University College London, London WC1E 6JF, UK
| | - Liliane Louedec
- INSERM U1148, CHU X. Bichat, 46 rue H. Huchard, F-75018 Paris, France
| | - Fangfang Li
- INSERM U1148, CHU X. Bichat, 46 rue H. Huchard, F-75018 Paris, France; Paris Descartes University, Sorbonne Paris Cité, UMR-S1148, Paris F-75018, France
| | - Amira M Senbel
- Alexandria University, Faculty of Pharmacy, Department of Pharmacology and Toxicology, Alexandria, Egypt
| | | | - Claire Danel
- CHU X. Bichat, Assistance Publique-Hôpitaux de Paris, Paris Diderot University, Sorbonne Paris Cité, UMR-1148, Paris F-75018, France
| | - Dan Longrois
- INSERM U1148, CHU X. Bichat, 46 rue H. Huchard, F-75018 Paris, France; Paris Nord University, Sorbonne Paris Cité, UMR-S1148, Paris F-75018, France; CHU X. Bichat, Assistance Publique-Hôpitaux de Paris, Paris Diderot University, Sorbonne Paris Cité, UMR-1148, Paris F-75018, France
| | - Lucie H Clapp
- Department of Medicine, University College London, London WC1E 6JF, UK
| | - Xavier Norel
- INSERM U1148, CHU X. Bichat, 46 rue H. Huchard, F-75018 Paris, France; Paris Nord University, Sorbonne Paris Cité, UMR-S1148, Paris F-75018, France.
| | - Gökçe Topal
- Istanbul University, Faculty of Pharmacy, Department of Pharmacology, Beyazit, 34116 Istanbul, Turkey
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Turner EC, Kavanagh DJ, Mulvaney EP, McLean C, Wikström K, Reid HM, Kinsella BT. Identification of an interaction between the TPalpha and TPbeta isoforms of the human thromboxane A2 receptor with protein kinase C-related kinase (PRK) 1: implications for prostate cancer. J Biol Chem 2011; 286:15440-57. [PMID: 21357687 DOI: 10.1074/jbc.m110.181180] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
In humans, thromboxane (TX) A(2) signals through the TPα and TPβ isoforms of the TXA(2) receptor or TP. Here, the RhoA effector protein kinase C-related kinase (PRK) 1 was identified as an interactant of both TPα and ΤPβ involving common and unique sequences within their respective C-terminal (C)-tail domains and the kinase domain of PRK1 (PRK1(640-942)). Although the interaction with PRK1 is constitutive, agonist activation of TPα/TPβ did not regulate the complex per se but enhanced PRK1 activation leading to phosphorylation of its general substrate histone H1 in vitro. Altered PRK1 and TP expression and signaling are increasingly implicated in certain neoplasms, particularly in androgen-associated prostate carcinomas. Agonist activation of TPα/TPβ led to phosphorylation of histone H3 at Thr(11) (H3 Thr(11)), a previously recognized specific marker of androgen-induced chromatin remodeling, in the prostate LNCaP and PC-3 cell lines but not in primary vascular smooth muscle or endothelial cells. Moreover, this effect was augmented by dihydrotestosterone in androgen-responsive LNCaP but not in nonresponsive PC-3 cells. Furthermore, PRK1 was confirmed to constitutively interact with TPα/TPβ in both LNCaP and PC-3 cells, and targeted disruption of PRK1 impaired TPα/TPβ-mediated H3 Thr(11) phosphorylation in, and cell migration of, both prostate cell types. Collectively, considering the role of TXA(2) as a potent mediator of RhoA signaling, the identification of PRK1 as a bona fide interactant of TPα/TPβ, and leading to H3 Thr(11) phosphorylation to regulate cell migration, has broad functional significance such as within the vasculature and in neoplasms in which both PRK1 and the TPs are increasingly implicated.
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Affiliation(s)
- Elizebeth C Turner
- School of Biomolecular and Biomedical Sciences, Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield, Dublin 4, Ireland
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