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Jiang Y, Yu Q, Sui D, Yu X, Xu H, Li M. 20(S)-Protopanaxadiol Alleviates Myocardial Ischemia/Reperfusion Injury in Rats Through Suppression of Oxidative Stress and Apoptosis. Nat Prod Commun 2021. [DOI: 10.1177/1934578x211029528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
20(S)-protopanaxadiol (PPD) is an active natural product which is transformed from protopanaxadiol-type ginsenosides. The present study was conducted to evaluate the effects of PPD on myocardial ischemia/reperfusion (I/R) injury in a rat model. PPD (20mg/kg) or positive-control drug Diltiazem (10mg/kg) was administered daily for 7 days before left anterior descending I/R operation. After 2-hour reperfusion, changes of cardiac morphology, structure, and function were evaluated by HE staining and echocardiography. Myocardial infarct size was assessed using nitroblue tetrazolium staining. The activities of cardiac enzymes in serum were also evaluated. Cardiomyocyte apoptosis was detected using the terminal dUTP nick end labelling (TUNEL) assay. The extent of oxidative stress was evaluated according to the activities of superoxide dismutase (SOD) and glutathione per oxidase (GPx) and the levels of malondialdehyde (MDA). Western blot and immunohistochemistry were used to determine the expression of apoptosis associated proteins, including Bcl-2, Bax, cleaved Caspase-3, cleaved Caspase-9, and cytochrome C. According to the results, PPD reduced I/R‑induced increases in myocardial infarct size and improved cardiac function. Furthermore, PPD decreased cardiomyocyte apoptosis on TUNEL staining, which was verified by increased Bcl-2, and decreased expression of Bax, cytochrome C, cleaved Caspase-9, and cleaved Caspase-3 in I/R rat myocardium. Additionally, PPD reduced MDA levels and increased the anti-oxidative capacity by upregulating the activities of SOD and GPx. Taken together, the results suggest that PPD serves a protective role against oxidative stress and cardiomyocyte apoptosis during myocardial ischemia/reperfusion injury.
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Affiliation(s)
- Yichuan Jiang
- Department of Pharmacy, China-Japan Union Hospital, Jilin University, Changchun, China
- Department of Pharmacology, School of Pharmaceutical Sciences, Jilin University, Changchun, China
| | - Qian Yu
- Department of Pharmacy, China-Japan Union Hospital, Jilin University, Changchun, China
| | - Dayun Sui
- Department of Pharmacology, School of Pharmaceutical Sciences, Jilin University, Changchun, China
- Pharmacological Experiment Center, School of Pharmaceutical Sciences, Jilin University, Changchun, China
| | - Xiaofeng Yu
- Pharmacological Experiment Center, School of Pharmaceutical Sciences, Jilin University, Changchun, China
| | - Huali Xu
- Department of Pharmacology, School of Pharmaceutical Sciences, Jilin University, Changchun, China
| | - Min Li
- Pharmacological Experiment Center, School of Pharmaceutical Sciences, Jilin University, Changchun, China
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Sventzouri S, Nanas I, Vakrou S, Kapelios C, Sousonis V, Sfakianaki T, Papalois A, Manolis AS, Nanas JN, Malliaras K. Pharmacologic inhibition of the mitochondrial Na +/Ca 2+ exchanger protects against ventricular arrhythmias in a porcine model of ischemia-reperfusion. Hellenic J Cardiol 2018; 59:217-222. [PMID: 29292245 DOI: 10.1016/j.hjc.2017.12.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2017] [Revised: 12/03/2017] [Accepted: 12/22/2017] [Indexed: 01/19/2023] Open
Abstract
BACKGROUND The mitochondrial Na+/Ca2+ exchanger (mNCX) has been implicated in the pathogenesis of arrhythmogenicity and myocardial reperfusion injury, rendering its inhibition a potential therapeutic strategy. We examined the effects of CGP-37157, a selective mNCX inhibitor, on arrhythmogenesis, infarct size (IS), and no reflow area (NRA) in a porcine model of ischemia-reperfusion. METHODS Forty pigs underwent myocardial ischemia for 60 minutes, followed by 2 hours of reperfusion. Animals were randomized to receive intracoronary infusion of 0.02 mg/kg CGP-37157 or vehicle, either before ischemia (n=17) or before reperfusion (n=17). Animals were monitored for arrhythmias. Myocardial area at risk (AR), IS, and NRA were measured by histopathology. RESULTS AR, NRA, and IS were comparable between groups. Administration of CGP-37157 before ischemia resulted in the following: (a) suppression of ventricular tachyarrhythmias (events/pig: 1.5±1.1 vs 3.5±1.9, p=0.014), (b) easier cardioversion of ventricular tachyarrhythmias (defibrillations required for cardioversion of each episode: 2.6±2.3 vs 6.2±2.1, p=0.006), and (c) decreased maximal depression of the J point (0.75±0.27 mm vs 1.75±0.82 mm, p=0.007), compared to controls. Administration of CGP-37157 before reperfusion expedited ST-segment resolution; complete ST-segment resolution within 30 minutes of reperfusion was observed in 7/8 CGP-37157-treated animals versus 1/9 controls (p=0.003). CONCLUSIONS In a porcine model of myocardial infarction, intracoronary administration of CGP-37157 did not decrease IS or NRA. However, it suppressed ventricular arrhythmias, decreased depression of the J point during ischemia and expedited ST-segment resolution after reperfusion. These findings motivate further investigation of pharmacologic mNCX inhibition as a potential therapeutic strategy to suppress arrhythmias in the injured heart.
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Affiliation(s)
- Stefania Sventzouri
- 3rd Department of Cardiology, University of Athens School of Medicine, 11 527, Athens, Greece
| | - Ioannis Nanas
- 3rd Department of Cardiology, University of Athens School of Medicine, 11 527, Athens, Greece
| | - Styliani Vakrou
- 3rd Department of Cardiology, University of Athens School of Medicine, 11 527, Athens, Greece
| | - Chris Kapelios
- 3rd Department of Cardiology, University of Athens School of Medicine, 11 527, Athens, Greece
| | - Vasilios Sousonis
- 3rd Department of Cardiology, University of Athens School of Medicine, 11 527, Athens, Greece
| | - Titika Sfakianaki
- 3rd Department of Cardiology, University of Athens School of Medicine, 11 527, Athens, Greece
| | | | - Antonis S Manolis
- 3rd Department of Cardiology, University of Athens School of Medicine, 11 527, Athens, Greece
| | - John N Nanas
- 3rd Department of Cardiology, University of Athens School of Medicine, 11 527, Athens, Greece
| | - Konstantinos Malliaras
- 3rd Department of Cardiology, University of Athens School of Medicine, 11 527, Athens, Greece.
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Targeting mitochondrial calcium transport in myocardial infarction. Hellenic J Cardiol 2018; 59:223-225. [PMID: 29940221 DOI: 10.1016/j.hjc.2018.06.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Revised: 06/01/2018] [Accepted: 06/08/2018] [Indexed: 01/27/2023] Open
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Zwadlo C, Borlak J. Gene expression profiling of calcium-channel antagonists in the heart of hypertensive and normotensive rats reveals class specific effects. Vascul Pharmacol 2016; 87:121-128. [PMID: 27613148 DOI: 10.1016/j.vph.2016.09.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Accepted: 09/05/2016] [Indexed: 10/21/2022]
Abstract
Calcium channel blockers (CCB) differ in their effects on the cardiovascular system with diltiazem being less negatively ionotrop as compared to verapamil. Diltiazem is mainly used to treat supraventricular tachycardia, vasospastic angina and the Raynaud's syndrome. Little is known about the molecular effects of benzothiazepins on cardiac gene expression. We therefore investigated the effects of diltiazem on cardiac gene expression in normotensive and hypertensive rats with left ventricular hypertrophy and compared the results with our previous findings on verapamil and nifedipine. Spontaneously hypertensive (SHR) and normotensive Sprague Dawley (SD) rats were treated with 15mg/kg diltiazem b.i.d. for 3days. Total RNA was isolated from surgically removed hearts and the gene expression of ion channels, ion transporters and their associated partners, calcium handling proteins as well as stress and cellular differentiation markers was investigated by RT-PCR. Subsequently, hierarchical gene cluster analysis was performed to decode treatment effects of different classes of CCBs. CCB treatment of normotensive and hypertensive rats revealed class specific effects with diltiazem specifically repressing cardiac genes pertinent for ion homeostasis and excitation-contraction coupling in normotensive but not hypertensive rats. Conversely, verapamil and nifedipine caused predominantly repression of genes to affect ion homeostasis and contractile dysfunction in spontaneously hypertensive rats; nonetheless, genes coding for calcium-handling proteins were up-regulated. Unlike diltiazem treatment of normotensive rats with verapamil and/or nifedipine did not influence cardiac gene expression. The effects of diltiazem on cardiac gene expression provide a molecular rationale for its use in the treatment of vasospastic angina.
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Affiliation(s)
- Carolin Zwadlo
- Hannover Medical School, Department of Cardiology and Angiology, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.
| | - Jürgen Borlak
- Hannover Medical School, Centre for Pharmacology and Toxicology, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.
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Tanonaka K, Motegi K, Arino T, Marunouchi T, Takagi N, Takeo S. Possible pathway of Na(+) flux into mitochondria in ischemic heart. Biol Pharm Bull 2013; 35:1661-8. [PMID: 23037156 DOI: 10.1248/bpb.b12-00010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Previous studies showed that myocardial Na(+) overload during ischemia directly induced mitochondrial damage. The pathway for Na(+) flux into mitochondria remains unclear. We examined possible routes for Na(+) flux into mitochondria in the ischemic heart. Isolated perfused rat hearts were subjected to 15- to 35-min ischemia followed by 60-min reperfusion and then Na(+) content and respiratory function in mitochondria of the ischemic heart were determined. The mitochondrial Na(+) content of the ischemic heart was ischemic duration-dependently increased, associated with a reduction in mitochondrial respiratory function. To mimic induction of mitochondrial Na(+) overload in vitro, isolated mitochondria were incubated with 6.25 to 50 mM NaCl or sodium lactate, a metabolite of anaerobic glycolysis, in the presence and absence of a mitochondrial Na(+)/Ca(2+) exchanger inhibitor CGP37157 and a monocarboxylate transporter (MCT) inhibitor α-cyano-4-hydroxy cinnamic acid (CHCA). Incubation of mitochondria with NaCl or sodium lactate increased the mitochondrial Na(+) concentration. This increase in mitochondrial Na(+) was partially attenuated by the presence of either inhibitor. Combined treatment of mitochondria with both inhibitors attenuated sodium lactate-induced increase in Na(+) content to a greater degree than that treated with either agent. These results suggest that mitochondrial Na(+)/Ca(2+) exchanger and MCT inhibitor-sensitive Na(+) transporter are possible pathways for the mitochondrial Na(+) overload in the ischemic myocardium.
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Affiliation(s)
- Kouichi Tanonaka
- Department of Molecular and Cellular Pharmacology, Tokyo University of Pharmacy and Life Sciences, 1432–1Horinouchi, Hachioji, Tokyo 192–0392, Japan.
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Griffiths EJ. Mitochondria and heart disease. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2012; 942:249-67. [PMID: 22399426 DOI: 10.1007/978-94-007-2869-1_11] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Mitochondria play a key role in the normal functioning of the heart, and in the pathogenesis and development of various types of heart disease. Physiologically, mitochondrial ATP supply needs to be matched to the often sudden changes in ATP demand of the heart, and this is mediated to a large extent by the mitochondrial Ca(2+) transport pathways allowing elevation of mitochondrial [Ca(2+)] ([Ca(2+)](m)). In turn this activates dehydrogenase enzymes to increase NADH and hence ATP supply. Pathologically, [Ca(2+)](m) is also important in generation of reactive oxygen species, and in opening of the mitochondrial permeability transition pore (MPTP); factors involved in both ischaemia-reperfusion injury and in heart failure. The MPTP has proved a promising target for protective strategies, with inhibitors widely used to show cardioprotection in experimental, and very recently human, studies. Similarly mitochondrially-targeted antioxidants have proved protective in various animal models of disease and await clinical trials. The mitochondrial Ca(2+) transport pathways, although in theory promising therapeutic targets, cannot yet be targeted in human studies due to non-specific effects of drugs used experimentally to inhibit them. Finally, specific mitochondrial cardiomyopathies due to mutations in mtDNA have been identified, usually in a gene for a tRNA, which, although rare, are almost always very severe once the mutation has exceeded its threshold.
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Pugliese O, D'Ambrosio A, Campanile D, Quintieri F. Diltiazem induces regulatory T cells in vitro by modulating human dendritic cell maturation. Transpl Int 2011; 24:409-17. [PMID: 21210865 DOI: 10.1111/j.1432-2277.2010.01210.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Diltiazem is a calcium channel antagonist that has been commonly associated with currently used immunosuppressants to prevent acute graft rejection in humans. In this study, we examined the possibility that diltiazem may affect human dendritic cell (DC) functions in response to lipopolysaccharide (LPS) stimulation and may induce the generation of DC with the capacity to generate CD4(+) regulatory T cells (Tregs). Blood monocytes were cultured in the presence of diltiazem at the beginning of their differentiation process into DC. Monocyte-derived DCs were stimulated with LPS, and DCs differentiated in the presence of diltiazem showed a decreased interleukin (IL)-12 production and an enhanced IL-10 production. When cultured with CD4(+) CD45RA(+) they were able to enhance the CD4(+) Foxp3(+) T-cell population and to induce slowly proliferating T cells, which showed a significant increase of transforming growth factor (TGF)-β production. These T cells suppress proliferation of activated autologous T cells, and we show that this effect is attributable to soluble factors, primarily to TGF-β. Blockade of TGF-β by specific monoclonal antibodies reversed this inhibitory effect. Herein, we provide new evidence that diltiazem-conditioned monocyte-derived DC induce T cells which acquire a regulatory phenotype and activity similar to those described for Tregs.
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Affiliation(s)
- Orsola Pugliese
- Section of Immune-mediated Diseases, Department of Infectious, Parasitic and Immune-mediated Diseases, Istituto Superiore di Sanità, Rome, Italy
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Mitochondrial calcium transport in the heart: Physiological and pathological roles. J Mol Cell Cardiol 2009; 46:789-803. [DOI: 10.1016/j.yjmcc.2009.03.001] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2009] [Revised: 02/28/2009] [Accepted: 03/03/2009] [Indexed: 12/20/2022]
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Fansa I, Altug ME, Melek I, Ucar E, Kontas T, Akcora B, Atik E, Duman T. The Neuroprotective and Anti-inflammatory Effects of Diltiazem in Spinal Cord Ischaemia–Reperfusion Injury. J Int Med Res 2009; 37:520-33. [DOI: 10.1177/147323000903700228] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
The protective effects of diltiazem were examined in a rabbit model of spinal cord ischaemia–reperfusion induced by infrarenal aortic occlusion for 30 min. In the diltiazem group ( n = 6), an intravenous infusion (2 μg/kg per min) was started 10 min before ischaemia induction; normal saline solution was infused in the control group ( n = 6). Neurological function was assessed using modified Tarlov criteria 24 h after surgery. Plasma samples were analysed for interleukin (IL)-6 and IL-10. Spinal tissue was analysed for malondialdehyde, nitric oxide and reduced glutathione activities. Tarlov scores of the diltiazem-treated rabbits indicated significantly improved hind-limb motor function compared with the control group. The diltiazem group also had better quantitative and qualitative histopathological findings. Diltiazem infusion significantly reduced IL-6 levels 3 and 24 h after reperfusion compared with the control group. The mean IL-10 level in the diltiazem group was significantly higher than in the control group 24 h after reperfusion. It is concluded that diltiazem has cytoprotective and anti-inflammatory properties, leading to reduced spinal cord injury.
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Affiliation(s)
- I Fansa
- Department of Cardiovascular Surgery, Faculty of Medicine, Mustafa Kemal University, Antakya/Hatay, Turkey
| | - ME Altug
- Department of Surgery, Faculty of Veterinary Medicine, Mustafa Kemal University, Antakya/Hatay, Turkey
| | - I Melek
- Department of Neurology, Faculty of Medicine, Mustafa Kemal University, Antakya/Hatay, Turkey
| | - E Ucar
- Department of Internal Medicine, Faculty of Medicine, Mustafa Kemal University, Antakya/Hatay, Turkey
| | - T Kontas
- Department of Biochemistry, Faculty of Veterinary Medicine, Mustafa Kemal University, Antakya/Hatay, Turkey
| | - B Akcora
- Department of Paediatric Surgery, Faculty of Medicine, Mustafa Kemal University, Antakya/Hatay, Turkey; and
| | - E Atik
- Department of Pathology, Faculty of Medicine, Mustafa Kemal University, Antakya/Hatay, Turkey
| | - T Duman
- Department of Neurology, Faculty of Medicine, Mustafa Kemal University, Antakya/Hatay, Turkey
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Motegi K, Tanonaka K, Takenaga Y, Takagi N, Takeo S. Preservation of mitochondrial function may contribute to cardioprotective effects of Na+/Ca2+ exchanger inhibitors in ischaemic/reperfused rat hearts. Br J Pharmacol 2007; 151:963-78. [PMID: 17549042 PMCID: PMC2042925 DOI: 10.1038/sj.bjp.0707321] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2007] [Revised: 04/03/2007] [Accepted: 04/18/2007] [Indexed: 01/24/2023] Open
Abstract
BACKGROUND AND PURPOSE Na+/Ca2+ exchanger (NCX) inhibitors are known to attenuate myocardial reperfusion injury. However, the exact mechanisms for the cardioprotection remain unclear. The present study was undertaken to examine the mechanism underlying the cardioprotection by NCX inhibitors against ischaemia/reperfusion injury. EXPERIMENTAL APPROACH Isolated rat hearts were subjected to 35-min ischaemia/60-min reperfusion or 20-min ischaemia/60-min reperfusion. NCX inhibitors (3-30 microM KB-R7943 (KBR) or 0.3-1 microM SEA0400 (SEA)) were given for 5 min prior to ischaemia (pre-ischaemic treatment) or for 10 min after the onset of reperfusion (post-ischaemic treatment). KEY RESULTS With 35-min ischaemia/60-min reperfusion, pre- or post-ischaemic treatment with KBR or SEA neither enhanced post-ischaemic contractile recovery nor attenuated ischaemia- or reperfusion-induced Na+ accumulation and damage to mitochondrial respiratory function. With the milder model (20-min ischaemia/reperfusion), pre- or post-ischaemic treatment with 10 microM KBR or 1 microM SEA significantly enhanced the post-ischaemic contractile recovery, associated with reductions in reperfusion-induced Ca2+ accumulation, damage to mitochondrial function, and decrease in myocardial high-energy phosphates. Furthermore, Na+ influx to mitochondria in vitro was enhanced by increased concentrations of NaCl. KBR (10 microM) and 1 microM SEA partially decreased the Na+ influx. CONCLUSIONS AND IMPLICATIONS The NCX inhibitors exerted cardioprotective effects during relatively mild ischaemia. The mechanism may be attributable to prevention of mitochondrial damage, possibly mediated by attenuation of Na+ overload in cardiac mitochondria during ischaemia and/or Ca2+ overload via the reverse mode of NCX during reperfusion.
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Affiliation(s)
- K Motegi
- Department of Molecular and Cellular Pharmacology, Tokyo University of Pharmacy and Life Sciences Hachioji, Japan
| | - K Tanonaka
- Department of Molecular and Cellular Pharmacology, Tokyo University of Pharmacy and Life Sciences Hachioji, Japan
| | - Y Takenaga
- Department of Molecular and Cellular Pharmacology, Tokyo University of Pharmacy and Life Sciences Hachioji, Japan
| | - N Takagi
- Department of Molecular and Cellular Pharmacology, Tokyo University of Pharmacy and Life Sciences Hachioji, Japan
| | - S Takeo
- Department of Molecular and Cellular Pharmacology, Tokyo University of Pharmacy and Life Sciences Hachioji, Japan
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Ma JN, Schiffer HH, Knapp AE, Wang J, Wong KK, Currier EA, Owens M, Nash NR, Gardell LR, Brann MR, Olsson R, Burstein ES. Identification of the Atypical L-Type Ca2+ Channel Blocker Diltiazem and Its Metabolites As Ghrelin Receptor Agonists. Mol Pharmacol 2007; 72:380-6. [PMID: 17475811 DOI: 10.1124/mol.107.034298] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Using a high-throughput functional screen, the atypical L-type Ca2+ channel blocker diltiazem was discovered to be an agonist at the human ghrelin (GHSR1a) receptor. In cellular proliferation, Ca2+ mobilization, and bioluminescence resonance energy transfer (BRET-2) assays, diltiazem was a partial agonist at GHSR1a receptors, with 50 to 80% relative efficacy compared with the GHSR1a peptide agonist GHRP-6, and high nanomolar to low micromolar potency, depending upon the assay. Seven of the known primary metabolites of diltiazem were synthesized, and three of them (MA, M1, and M2) were more efficacious and/or more potent than diltiazem at GHSR1a receptors, with a rank order of agonist activity of M2 > M1 > MA > diltiazem, whereas M4 and M6 metabolites displayed weak agonist activity, and the M8 and M9 metabolites were inactive. Binding affinities of diltiazem and these metabolites to GHSR1a receptors followed a similar rank order. In vivo tests showed that diltiazem and M2 each stimulated growth hormone release in male Sprague-Dawley neonatal rats, although to a lesser degree than GHRP-6. Thus, diltiazem and chemical analogs of diltiazem represent a new class of GHSR1a receptor agonists. The possible contributions of GHSR1a receptor activation to the clinical actions of diltiazem are discussed in the context of the known beneficial cardiovascular effects of ghrelin.
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Affiliation(s)
- Jian-Nong Ma
- ACADIA Pharmaceuticals, Inc., 3911 Sorrento Valley Blvd., San Diego, CA 92121, USA
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