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Engin E, Alp Yildirim Fİ, Kalelі Durman D, Ömeroğlu SN, Göksedef D, Teskіn Ö, Balkanay OO, İpek G, Uydeş Doğan BS. Relaxant effect of the prostacyclin analogue iloprost on isolated human radial artery: An approach for the reversal of graft spasm. Prostaglandins Other Lipid Mediat 2017; 133:35-41. [PMID: 29107024 DOI: 10.1016/j.prostaglandins.2017.10.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2017] [Revised: 10/10/2017] [Accepted: 10/17/2017] [Indexed: 10/18/2022]
Abstract
Radial artery graft spasm in the perioperative or postoperative period of coronary bypass surgery necessitates urgent treatment due to risk of graft failure and mortality. Herein, we evaluated the effect of iloprost, a prostacyclin (PGI2) analogue, against the contractions produced by noradrenaline and potassium chloride on isolated human radial artery. Following the determination of endothelial and vascular relaxing capacities of the arteries, iloprost (10-9M-10-6M) was cumulatively applied on rings precontracted submaximally with the spasmogens. In some rings, the response to iloprost was assessed following pretreatment with nitric oxide (NO) synthase inhibitor, l-NAME (3×10-4M,30min). Iloprost produced complete relaxations on radial artery rings precontracted with noradrenaline whereas, only moderate relaxations against the contractions induced by potassium chloride. Notably, the relaxation to iloprost was remarkably blunted in radial arteries with impaired endothelial function. Moreover, the relaxation to iloprost was unchanged in rings pretreated with l-NAME. Our results demonstrated that iloprost could be a potent relaxant agent in reversing radial artery spasm, particularly initiated by noradrenaline, possibly acting via an endothelium-mediated mechanism unrelated to NO.
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Affiliation(s)
- Ersoy Engin
- Department of Cardiovascular Surgery, Cerrahpaşa Medical Faculty, Istanbul, Turkey; Department of Cardiovascular Surgery, Şişli Hamidiye Etfal Education and Research Hospital, Istanbul, Turkey
| | - F İlkay Alp Yildirim
- Department of Pharmacology, Faculty of Pharmacy, Istanbul University, Istanbul, Turkey
| | - Deniz Kalelі Durman
- Department of Pharmacology, Faculty of Pharmacy, Istanbul University, Istanbul, Turkey
| | - Suat Nail Ömeroğlu
- Department of Cardiovascular Surgery, Cerrahpaşa Medical Faculty, Istanbul, Turkey
| | - Deniz Göksedef
- Department of Cardiovascular Surgery, Cerrahpaşa Medical Faculty, Istanbul, Turkey
| | - Önder Teskіn
- Biruni University, Faculty of Medicine, Department of Cardiovascular Surgery, Istanbul, Turkey
| | - Ozan Onur Balkanay
- Department of Cardiovascular Surgery, Cerrahpaşa Medical Faculty, Istanbul, Turkey
| | - Gökhan İpek
- Department of Cardiovascular Surgery, Cerrahpaşa Medical Faculty, Istanbul, Turkey
| | - B Sönmez Uydeş Doğan
- Department of Pharmacology, Faculty of Pharmacy, Istanbul University, Istanbul, Turkey.
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Decreased vasorelaxation induced by iloprost during acute inflammation in human internal mammary artery. Eur J Pharmacol 2017; 804:31-37. [PMID: 28373136 DOI: 10.1016/j.ejphar.2017.03.060] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Revised: 03/27/2017] [Accepted: 03/30/2017] [Indexed: 12/25/2022]
Abstract
Cyclooxygenase-2 (COX-2) induction in human internal mammary arteries (IMA) under inflammatory conditions has been associated with attenuated norepinephrine (NE)-induced vasoconstriction. This effect was associated with increased prostaglandin (PG) E2 and prostacyclin (PGI2) releases. The present study was designed to assess the role of these PG and their receptors (EP and IP, respectively) on the vascular reactivity during acute inflammation. Isolated IMA were cultured in the absence (Control conditions) or presence (Inflammatory conditions) of both interleukin-1 beta (IL-1β) and lipopolysaccharide (LPS). The vasorelaxation and the increased content of cyclic adenosine monophosphate (cAMP) induced by iloprost, a PGI2 analogue, were significantly reduced under inflammatory conditions and restored in preparations cultured with the IP antagonist (CAY10441). Decreased cAMP levels under inflammatory conditions are due to at least increased phosphodiesterase (PDE) 4B expression. On the other hand, PGE2, thromboxane analogues and EP agonists-induced vasoconstrictions were not affected under inflammatory conditions. No vasorelaxation was observed with PGD2, PGE2 or the EP2/4 agonists in pre-contracted IMA. Finally, using RT-qPCR and immunohistochemistry, the COX-2, IP receptor and PGI2 synthase (PGIS) were detected. A significant increase of COX-2 and moderate increase of IP mRNA expression was observed under inflammatory conditions, whereas PGIS mRNA level was not affected. This study demonstrates that PGI2/IP receptor signalling and PGI2-induced relaxation are impaired in human IMA during acute inflammation, whereas the responses induced by other prostanoids are not affected. These results could explain some of the mechanisms of vascular dysfunction reported in inflammatory conditions.
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Ege T, Gur O, Karadag CH, Duran E. Evaluation of iloprost to prevent vasospasm in coronary artery bypass grafts. J Int Med Res 2011; 38:1759-63. [PMID: 21309490 DOI: 10.1177/147323001003800521] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
This study assessed the efficacy of iloprost in relieving vasospasm in coronary artery bypass grafts. Radial artery (RA), left internal thoracic artery (LITA) and saphenous vein (SV) grafts were taken from 20 patients (13 men and seven women, mean age 63.8 years [range 48-74 years]) scheduled to undergo coronary artery bypass grafting. Ten 3 mm vascular rings were cut from each graft and kept under tension for at least 60 min. They were kept alive with 37 degrees C oxygenated Krebs solution. Smooth muscle contraction was achieved with phenylephrine before iloprost was administered every 2 min, starting at a concentration of 10(-9) mol/l and increasing in logarithmic increments to a concentration of 10(-5) mol/l. The vasodilation response to iloprost started in all samples at a concentration of 10(-9) mol/l and increased with each incremental increase in iloprost concentration up to 10(-5) mol/l. These data suggest that local administration of iloprost has a role in relieving graft vasospasm during harvesting and preparation for coronary artery bypass grafting.
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Affiliation(s)
- T Ege
- Department of Cardiovascular Surgery, Trakya University Medical Faculty, Edirne, Turkey.
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