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Soliman EA, Panda SS, Aziz MN, Shalaby EM, Mishriky N, Asaad FM, Girgis AS. Synthesis, molecular modeling studies and bronchodilation properties of nicotinonitrile containing-compounds. Eur J Med Chem 2017; 138:920-931. [PMID: 28753516 DOI: 10.1016/j.ejmech.2017.07.025] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Revised: 06/30/2017] [Accepted: 07/16/2017] [Indexed: 12/13/2022]
Abstract
Facile synthetic pathway for nicotinonitriles 5a‒o, 7a‒i was demonstrated through reaction of ketones 4a‒k, 6a‒f with ylidenemalononitrile 3 in the presence of sodium alkoxide. Meanwhile, nucleophilic attack of amines on 2-bromonicotinonitrile 9 (obtained through reaction of propenone 8 with malononitrile, followed by bromination with bromine in acetic acid) afforded 3-pyridinecarbonitriles 11a‒d. Single crystal X-ray of compound 7i reveals the monoclinic space group C2/c with 8 molecules per unit cell. Optimized structure of 7i [DFT/B3LYP, 6-31G(d,p)] shows close correlations to that of X-ray study. Compound 5l seems superior among all the synthesized analogues exhibiting bronchodilation properties about three folds potency compared to theophylline (standard reference) through pre-contracted tracheal rings with histamine standard method. Also compound 5a reveals promising observations (about two folds potency of the standard reference). Molecular modeling studies (3D-pharmacophore and 2D-QSAR) supported the observed biological properties.
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Affiliation(s)
- E A Soliman
- Chemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt
| | - Siva S Panda
- Department of Chemistry & Physics, Augusta University, Augusta, GA 30912, USA
| | - Marian N Aziz
- Pesticide Chemistry Department, National Research Centre, Dokki, Giza 12622, Egypt
| | - ElSayed M Shalaby
- X-ray Crystallography Laboratory, Physics Division, National Research Centre, Dokki, Giza 12622, Egypt
| | - Nawal Mishriky
- Pesticide Chemistry Department, National Research Centre, Dokki, Giza 12622, Egypt
| | - Fahmy M Asaad
- Pesticide Chemistry Department, National Research Centre, Dokki, Giza 12622, Egypt
| | - Adel S Girgis
- Pesticide Chemistry Department, National Research Centre, Dokki, Giza 12622, Egypt.
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Al-Said MS, Ghorab MM, Nissan YM. Dapson in heterocyclic chemistry, part VIII: synthesis, molecular docking and anticancer activity of some novel sulfonylbiscompounds carrying biologically active 1,3-dihydropyridine, chromene and chromenopyridine moieties. Chem Cent J 2012; 6:64. [PMID: 22748424 PMCID: PMC3543391 DOI: 10.1186/1752-153x-6-64] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2012] [Accepted: 06/07/2012] [Indexed: 11/19/2022] Open
Abstract
Several new sulfonebiscompounds having a biologically active 1,2-dihydropyridine-2-one 3-19, acrylamide 20, chromene 21, 22 and chromenopyridine 23, 24 moieties were synthesized and evaluated as potential anticancer agents. The structures of the products were confirmed via elemental analyses and spectral data. The screening tests showed that many of the biscompounds obtained exhibited good anticancer activity against human breast cell line (MCF7) comparable to doxorubicin which was used as reference drug. Compounds 11, 17 and 24 showed IC50 values 35.40 μM, 29.86 μM and 30.99 μM, respectively. In order to elucidate the mechanism of action of the synthesized compounds as anticancer agents, docking on the active site of farnesyltransferase and arginine methyltransferase was also performed and good results were obtained.
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Affiliation(s)
- Mansour S Al-Said
- Medicinal, Aromatic and Poisonous Plants Research Center (MAPPRC), College of Pharmacy, King Saud University, 2457, Riyadh, 11451, Saudi Arabia
| | - Mostafa M Ghorab
- Medicinal, Aromatic and Poisonous Plants Research Center (MAPPRC), College of Pharmacy, King Saud University, 2457, Riyadh, 11451, Saudi Arabia
| | - Yassin M Nissan
- Pharmaceutical Chemistry Department, Faculty of Pharmacy, Cairo University, Cairo, Egypt
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Gill J, Jeremy JY, Mikhailidis DP. Role of Protein Kinases in Mediating [45Ca2+] Uptake by Human Platelets. Platelets 2009; 4:316-21. [DOI: 10.3109/09537109309013234] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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4
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Demoliou-Mason CD. Overview: Cardiovascular & Renal; Cyclic nucleotide phosphodiesterase inhibitors. Expert Opin Ther Pat 2008. [DOI: 10.1517/13543776.5.5.417] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Uchida M, Iida H, Iida M, Kumazawa M, Sumi K, Takenaka M, Dohi S. Both milrinone and colforsin daropate attenuate the sustained pial arteriolar constriction seen after unclamping of an abdominal aortic cross-clamp in rabbits. Anesth Analg 2005; 101:9-16, table of contents. [PMID: 15976198 DOI: 10.1213/01.ane.0000158610.76898.5c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
We previously reported that unclamping of an abdominal aortic cross-clamp causes initial dilation of pial arteries followed by sustained constriction. Both milrinone and colforsin daropate have a vasodilator action, and both have been used in such critical conditions as abdominal aortic aneurysmectomy. We measured cerebral pial arteriolar diameters using a rabbit closed cranial window preparation before (baseline) and 15 min after the start of an IV infusion of 0.9% saline (control group), milrinone, or colforsin daropate (0.05 and 0.5 microg . /kg(-1) . min(-1)) (pre-clamp), just after aortic clamping, 20 min after clamping, and at 0 to 60 min after unclamping. In the control group, a significant decrease in diameter persisted for at least 60 min after unclamping (maximum, -15% for large and -26% for small arterioles versus baseline). These values were significantly smaller after both doses of milrinone and the larger dose of colforsin daropate (-5% and -8%, 10% and 12%, and -2% and -5%, respectively vs baseline, at 60 min). In a second experiment, changes in regional cerebral blood flow and tissue oxygen tension reflected changes in vascular variables. Thus, sustained cerebral pial arteriolar constriction induced by aortic unclamping can be attenuated by IV milrinone or colforsin daropate.
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Affiliation(s)
- Masayoshi Uchida
- Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, 1-1 Yanagido, Gifu City, Gifu 501-1194, Japan
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6
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Taniguchi M, Magata S, Suzuki T, Shimamura T, Jin MB, Iida J, Furukawa H, Todo S. Dipyridamole protects the liver against warm ischemia and reperfusion injury. J Am Coll Surg 2004; 198:758-69. [PMID: 15110810 DOI: 10.1016/j.jamcollsurg.2003.12.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2003] [Revised: 12/08/2003] [Accepted: 12/08/2003] [Indexed: 11/13/2022]
Abstract
BACKGROUND Adenosine, a metabolite of adenosine triphosphate degradation during ischemia, is reported to attenuate ischemia and reperfusion injury in several tissues. Dipyridamole is a nucleoside transport inhibitor that augments endogenous adenosine. In this study, we tested whether dipyridamole would attenuate hepatic I/R injury. For this purpose, dipyridamole was applied to a 2-hour total hepatic vascular exclusion model in dogs. STUDY DESIGN Dipyridamole (DYP) was given by continuous intravenous infusion for 1 hour before ischemia at a dose of 0.25 mg/kg (high-DYP, n = 6), 0.1 mg/kg (medium-DYP, n = 6), or 0.05 mg/kg (low-DYP, n = 6). Nontreated animals were used as ischemic controls (CT, n = 12). Two-week survival, systemic and hepatic hemodynamics, liver function tests, energy metabolism, adenosine 3', 5'-cyclic monophosphate (cyclic AMP) levels, platelet numbers, arachidonic acid metabolites, and histopathology were analyzed. RESULTS Two-week animal survival was 25% in CT, 17% in high-DYP, 100% in medium-DYP, and 17% in low-DYP. Dipyridamole significantly improved postreperfusion hepatic blood flow and energy metabolism, attenuated liver enzyme release and purine catabolite production, and augmented cyclic AMP levels. The medium dose of dipyridamole lessened platelet aggregation, thromboxane B2 production, and polymorphonuclear neutrophil infiltration, and improved survival. CONCLUSIONS We demonstrated marked hepatoprotective effects of dipyridamole against severe ischemia and reperfusion injury in canine livers. Dipyridamole is a promising agent for liver surgery and transplantation.
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Affiliation(s)
- Masahiko Taniguchi
- First Department of Surgery, Hokkaido University School of Medicine, N-15 W-7 Kita-ku, Sapporo 060-8638, Japan
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Ishikawa H, Jin MB, Ogata T, Taniguchi M, Suzuki T, Shimamura T, Magata S, Horiuchi H, Ogata K, Masuko H, Fujita M, Furukawa H, Todo S. Role of cyclic nucleotides in ischemia and reperfusion injury of canine livers. Transplantation 2002; 73:1041-8. [PMID: 11965029 DOI: 10.1097/00007890-200204150-00005] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND In a series of canine liver ischemia experiments, we have shown that amelioration of hepatic injury is achievable by the inhibition of vasoconstriction, cytokine production, platelet aggregation, and neutrophil infiltration. Cyclic adenosine diphosphate (cAMP) was considered to be involved in most of these events. In our study, we tested our hypothesis that augmentation of endogenous cAMP by phosphodiesterase (PDE) 3 inhibitor, amrinone (AM), or adenylate cyclase stimulator, NKH477 (NKH), could attenuate ischemia and reperfusion injury of the liver. METHODS Thirty-six beagle dogs were used. They were divided into group CT (untreated control), group AM, group NKH, and group CB (treated by both agents). AM or NKH were administered i.v. 1 hr before ischemia (group preAM and group preNKH) or 15 min before reperfusion (pos-AM and postNKH). Combination group animals were treated only before ischemia. Animal survival, hepatic tissue blood flow, liver enzymes, platelet counts, energy metabolism, hepatic cAMP and cyclic guanosine 3',5'-cyclic monophosphate levels, and histopathology were analyzed. RESULTS Two-week animal survival was significantly improved by pre- or posttreatment with either agent. After reperfusion, hepatic tissue blood flow, liver enzyme release, platelet counts, energy metabolism, tissue cAMP levels, and histological architecture were also ameliorated markedly. Combination of both agents induced severe liver damage and lethal hypotension. AM treatment exhibited more protective effects than NKH, particularly when it was given before ischemia. Interestingly, not only cyclic guanosine 3',5'-cyclic monophosphate, were also restored at higher levels after reperfusion by preischemia treatment. CONCLUSIONS Administration of amrinone or NKH477 maintained hepatic tissue concentrations of cyclic nucleotides, and attenuated ischemia and reperfusion injury of the liver. Thus, regulation of hepatic tissue cyclic nucleotides is an important alternative for prevention of hepatic damage in liver preservation and surgery.
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Affiliation(s)
- Hiroto Ishikawa
- First Department of Surgery, Hokkaido University School of Medicine, Sapporo, Japan
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8
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Tanaka H, Tajimi K, Miyajima Y, Kazama M, Kobayashi K. Effects of milrinone on platelet aggregation in swine with pulmonary hypertension. J Crit Care 2000; 15:113-8. [PMID: 11011824 DOI: 10.1053/jcrc.2000.16464] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
PURPOSE The purpose of this study was to investigate whether the effect of milrinone on platelet aggregation was related to the selectivity of vasodilation vasculature in a swine model with PH. MATERIALS AND METHODS To induce pulmonary hypertension, we injected two sets of acid-washed glass beads in 15 swine, which were divided into two groups (those receiving milrinone or not) and compared with each other. RESULTS The induction of pulmonary hypertension decreased the platelet count and increased the plasma levels of thromboxane B2 and 6-keto-prostaglandin F1alpha. CONCLUSION A locally high concentration of prostaglandin I2, at least in part, may produce selectivity of vasodilation in the pulmonary vasculature.
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Affiliation(s)
- H Tanaka
- Trauma and Critical Care Center and Department of Internal Medicine, Teikyo University School of Medicine, Tokyo, Japan
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Khan MA, Thompson CS, Sullivan ME, Jeremy JY, Mikhailidis DP, Morgan RJ. The role of prostaglandins in the aetiology and treatment of erectile dysfunction. Prostaglandins Leukot Essent Fatty Acids 1999; 60:169-74. [PMID: 10359018 DOI: 10.1054/plef.1999.0021] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Both animal and human penile tissue synthesize prostaglandins (PGs). Furthermore, intracavernous injection of certain PGs elicits erection in men with erectile dysfunction (ED). It is also well established that PGs are involved in the pathophysiology of atherosclerosis and diabetes mellitus (DM). Since atherosclerosis and DM are major risk factors for ED, it has been suggested that the disruption of PG synthesis in penile tissues and related vasculature may play a role in the pathogenesis of ED. In this review, we discuss the role of PGs in normal penile erection as well as on the pathophysiology and treatment.
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Affiliation(s)
- M A Khan
- Department of Urology, Royal Free and University College Medical School (University College London), UK
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Kondo K, Umemura K, Miyaji M, Nakashima M. Milrinone, a phosphodiesterase inhibitor, suppresses intimal thickening after photochemically induced endothelial injury in the mouse femoral artery. Atherosclerosis 1999; 142:133-8. [PMID: 9920514 DOI: 10.1016/s0021-9150(98)00203-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The effect of milrinone, a phosphodiesterase (PDE) inhibitor, on intimal thickening after endothelial denudation was investigated. Intimal thickening was induced in the femoral arteries of mice by a photochemical reaction between rose bengal and transluminal green light which caused endothelial injury followed by platelet adhesion, aggregation, and formation of an occlusive thrombus in the irradiated segment of the mouse femoral artery. In this model, intimal thickening occurred following spontaneous thrombolysis. The intima/media ratio at 21 days after irradiation was 0.556+/-0.104 in the untreated group. Oral administration of milrinone (0.3-3.0 mg/kg) for 3-21 days suppressed intimal thickening by up to 56% in a dose- and time-dependent manner. In an in vivo experiment using bromodeoxyuridine incorporation, milrinone suppressed cell proliferation at 1.0 mg/kg p.o. On the other hand, the minimum doses of milrinone for suppression of ex vivo platelet aggregation induced by collagen (0.8 microg/ml) or ADP (0.5 microM) were 3.0 and 10.0 mg/kg, respectively. These results indicate that milrinone may not suppress intimal thickening by inhibiting platelet function but by preventing vascular smooth muscle cell (VSMC) proliferation, probably through a mechanism mediated via 3', 5'-adenosine cyclic monophosphate (cAMP).
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Affiliation(s)
- K Kondo
- Department of Pharmacology, Hamamatsu University School of Medicine, Japan.
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Wright KF, Turner CR, Jayasinghe-Beck R, Cohan VL, Cheng JB, Watson JW. Differential in vivo and in vitro bronchorelaxant activities of CP-80,633, a selective phosphodiesterase 4 inhibitor. Can J Physiol Pharmacol 1997. [DOI: 10.1139/y97-123] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Khajavi K, Ayzman I, Shearer D, Jones SC, Levy JH, Prayson RA, Skibinski CI, Hahn JF, Chyatte D. Prevention of chronic cerebral vasospasm in dogs with milrinone. Neurosurgery 1997; 40:354-62; discussion 362-3. [PMID: 9007870 DOI: 10.1097/00006123-199702000-00025] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
OBJECTIVE Delayed cerebral ischemia resulting from vasospasm is a major cause of morbidity and death in patients with aneurysmal subarachnoid hemorrhage. Milrinone, because it inhibits Type IV cyclic adenosine monophosphate-specific phosphodiesterase enzyme in both cardiac and vascular smooth muscle, is a powerful inotrope and vasodilator, but it has little effect on heart rate or blood pressure. Because of these properties, milrinone is an attractive potential therapy after subarachnoid hemorrhage. The purpose of the present study was to investigate the effect of milrinone on chronic experimental cerebral vasospasm. METHODS A double-hemorrhage canine model of vasospasm was used to study the efficacy of milrinone. Angiographic vasospasm and systemic hemodynamics were compared in a treatment group of animals that received a loading dose of milrinone (0.05 mg/kg, intravenously) and then slow-release (0.05 microgram/kg/min) milrinone pellets (n = 10) and a control group that received placebo pellets (n = 9), over an 8-day period after the initial subarachnoid hemorrhage. The hemorrhage was created by injection of 4 ml of autologous, nonheparinized, arterial blood into the cisterna magna on Days 1 and 3. Hemodynamic measurements, including cardiac output determinations, were made on Days 0, 1, 3, 6, and 8 with a pulmonary artery catheter, and angiographic vasospasm was assessed on Day 8 by comparison with baseline angiograms. RESULTS Treatment with milrinone caused no significant changes in systemic hemodynamics. Angiographic vasospasm, however, was significantly reduced in the Day 8 angiograms for the treated group, compared with the control group (98.28 +/- 14.06 and 67.89 +/- 13.06% of original vessel cross-sectional area, respectively; P < 0.001). CONCLUSION Milrinone is effective in preventing chronic cerebral vasospasm in a canine model of experimental chronic cerebral vasospasm. This effect is independent of changes in systemic hemodynamics. Milrinone and related drugs warrant further investigation for the treatment of cerebral vasospasm.
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Affiliation(s)
- K Khajavi
- Department of Neurosurgery, William Beaumont Army Medical Center, Fort Bliss Army Base, Texas, USA
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Jeremy JY, Jackson CL, Bryan AJ, Angelini GD. Eicosanoids, fatty acids and restenosis following coronary artery bypass graft surgery and balloon angioplasty. Prostaglandins Leukot Essent Fatty Acids 1996; 54:385-402. [PMID: 8888350 DOI: 10.1016/s0952-3278(96)90022-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- J Y Jeremy
- Bristol Heart Institute, Bristol Royal Infirmary, UK
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Musgrave IF, Seifert R. Alpha 2A-adrenoceptors mediate activation of non-selective cation channels via Gi-proteins in human erythroleukaemia (HEL) cells. No evidence for a functional role of imidazoline receptors in modulating calcium. Biochem Pharmacol 1995; 49:187-96. [PMID: 7530955 DOI: 10.1016/s0006-2952(94)00432-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Human erythroleukaemia (HEL) cells were investigated to characterize their alpha 2-adrenoceptor and imidazoline receptor sites. Membranes from HEL cells bound [3H]2-(2-methoxy-1, 4-benzodioxan-2yl)-2-imidazoline ([3H]RX821002) in a saturable and specific manner with a KD of 0.64 +/- 0.07 nM and a Bmax of 126 +/- 4 fmol/mg protein. [3H]RX821002 was displaced from HEL membranes by adrenergic drugs with the order of potency being yohimbine approximately oxymetazoline >> prazosin = 2-[2-[4-(o-methoxyphenyl)piperazin-1-yl]ethyl]-4,4-dimethyl- 1,3(2H,4H)-isochinolindione HCl (ARC 239), consistent with this site being an alpha 2A-adrenoceptor. HEL membranes also bound [3H]idazoxan in the presence of adrenaline to block alpha 2-adrenoceptors. This binding was saturable and specific with a KD of 3.5 +/- 1.0 nM and a Bmax of 31 +/- 6 fmol/mg protein. Adrenergic drugs from both the phenylethylamine and imidazoline classes increased high-affinity GTPase activity, an index of activation of regulatory heterotrimeric guanine-nucleotide binding proteins (G-proteins), and produced increases in cytosolic free calcium concentration ([Ca2+]i). The effects of these agonists in both systems were abolished by pertussis toxin pretreatment, and oxymetazoline and clonidine were antagonists. The potency of adrenergic drugs to inhibit 5-bromo-6-(2-imidazolin-2-ylamino)-quinoxaline (UK 14304)-induced increases in [Ca2+]i was yohimbine approximately oxymetazoline >> ARC 239, consistent with the binding data and an action at alpha 2A-adrenoceptors. No evidence was found for a role of imidazoline receptors in stimulating G-proteins or modulating [Ca2+]i. The adrenergic agonist-induced increases in [Ca2+]i were due to both release of Ca2+ from intracellular stores and entry of extracellular Ca2+. Ca2+ entry was blocked by 1-(beta-[3-(4-methoxyphenyl)propoxy]-4-methoxyphenylethyl)-1H- imidazole hydrochloride (SKF 96365), but not by nitrendipine. Adrenaline also stimulated Mn2+ entry in HEL cells. Taken together, these results suggest that HEL cells have alpha 2A-adrenoceptors that activate non-selective cation channels via pertussis toxin-sensitive G-proteins, i.e. Gi-proteins.
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MESH Headings
- Binding, Competitive
- Calcium/analysis
- Cell Fractionation
- GTP Phosphohydrolases/metabolism
- GTP-Binding Proteins/metabolism
- Humans
- Imidazoline Receptors
- Ion Channels/metabolism
- Isoquinolines/pharmacology
- Leukemia, Erythroblastic, Acute/metabolism
- Oxymetazoline/pharmacology
- Pertussis Toxin
- Piperazines/pharmacology
- Receptors, Adrenergic, alpha/drug effects
- Receptors, Adrenergic, alpha/metabolism
- Receptors, Drug/drug effects
- Tumor Cells, Cultured
- Virulence Factors, Bordetella/pharmacology
- Yohimbine/pharmacology
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Affiliation(s)
- I F Musgrave
- Institut für Pharmakologie, Freie Universität Berlin, Germany
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Barradas MA, Jagroop A, O'Donoghue S, Jeremy JY, Mikhailidis DP. Effect of milrinone in human platelet shape change, aggregation and thromboxane A2 synthesis: an in vitro study. Thromb Res 1993; 71:227-36. [PMID: 8267765 DOI: 10.1016/0049-3848(93)90097-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Milrinone (MIL; a cAMP-specific phosphodiesterase type-III inhibitor), added in vitro to achieve concentrations below the therapeutic levels, inhibited agonist-induced platelet shape change (PSC). Arachidonic acid (AA)-induced PSC was significantly more inhibited by a combination of MIL and indomethacin (INDO; a cyclooxygenase inhibitor) than by either alone. PSC induced by 5-hydroxytryptamine was inhibited by MIL but not by INDO; and this effect of MIL was not augmented by INDO. Whole blood-platelet aggregation (WB-PA) and platelet-rich plasma aggregation induced by potent stimulators of thromboxane A2 (TXA2) synthesis such as AA and calcium ionophore and by less potent agonists (e.g. ADP and U46619) were inhibited by MIL at or near therapeutic concentrations. WB-PA induced by collagen was significantly more inhibited by the MIL and INDO combination than by either of these agents alone whereas with ADP-induced WB-PA no additional effect could be shown when both MIL and INDO were co-incubated. MIL and similar types of drugs may be of benefit in conditions associated with platelet hyperactivity and some of these effects may be enhanced by cyclooxygenase inhibitors.
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Affiliation(s)
- M A Barradas
- Department of Chemical Pathology & Human Metabolism, Royal Free Hospital School of Medicine (University of London), U.K
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