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Gergs U, Jacob H, Braekow P, Hofmann B, Pockes S, Humphrys LJ, Kirchhefer U, Fehse C, Neumann J. Lysergic acid diethylamide stimulates cardiac human H 2 histamine and cardiac human 5-HT 4-serotonin receptors. NAUNYN-SCHMIEDEBERG'S ARCHIVES OF PHARMACOLOGY 2024; 397:221-236. [PMID: 37401967 PMCID: PMC10771359 DOI: 10.1007/s00210-023-02591-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Accepted: 06/19/2023] [Indexed: 07/05/2023]
Abstract
Lysergic acid diethylamide (LSD) is an artificial hallucinogenic drug. Thus, we hypothesized that LSD might act 5-HT4 serotonin receptors and/or H2 histamine receptors. We studied isolated electrically stimulated left atrial preparations, spontaneously beating right atrial preparations, and spontaneously beating Langendorff-perfused hearts from transgenic mice with cardiomyocyte-specific overexpression of the human 5-HT4 receptor (5-HT4-TG) or of the H2-histamine receptor (H2-TG). For comparison, we used wild type littermate mice (WT). Finally, we measured isometric force of contraction in isolated electrically stimulated muscle strips from the human right atrium obtained from patients during bypass surgery. LSD (up to 10 µM) concentration dependently increased force of contraction and beating rate in left or right atrial preparations from 5-HT4-TG (n = 6, p < 0.05) in 5-HT4-TG atrial preparations. The inotropic and chronotropic effects of LSD were antagonized by 10 µM tropisetron in 5-HT4-TG. In contrast, LSD (10 µM) increased force of contraction and beating rate in left or right atrial preparations, from H2-TG. After pre-stimulation with cilostamide (1 µM), LSD (10 µM) increased force of contraction in human atrial preparations (n = 6, p < 0.05). The contractile effects of LSD in human atrial preparations could be antagonized by 10 µM cimetidine and 1 µM GR 125487. LSD leads to H2-histamine receptor and 5-HT4-receptor mediated cardiac effects in humans.
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Affiliation(s)
- Ulrich Gergs
- Institute for Pharmacology and Toxicology, Medical Faculty, Martin Luther University Halle-Wittenberg, Magdeburger Straße 4, 06097, Halle (Saale), Germany
| | - Hannes Jacob
- Institute for Pharmacology and Toxicology, Medical Faculty, Martin Luther University Halle-Wittenberg, Magdeburger Straße 4, 06097, Halle (Saale), Germany
| | - Pauline Braekow
- Institute for Pharmacology and Toxicology, Medical Faculty, Martin Luther University Halle-Wittenberg, Magdeburger Straße 4, 06097, Halle (Saale), Germany
| | - Britt Hofmann
- Department of Cardiac Surgery, Mid-German Heart Center, University Hospital Halle, Ernst Grube Straße 40, 06097, Halle (Saale), Germany
| | - Steffen Pockes
- Institute of Pharmacy, University of Regensburg, Universitätsstraße 31, 93040, Regensburg, Germany
| | - Laura J Humphrys
- Institute of Pharmacy, University of Regensburg, Universitätsstraße 31, 93040, Regensburg, Germany
| | - Uwe Kirchhefer
- Institute for Pharmacology and Toxicology, University Hospital Münster, Westfälische Wilhelms-University, Domagkstraße 12, 48149, Münster, Germany
| | - Charlotte Fehse
- Institute for Pharmacology and Toxicology, Medical Faculty, Martin Luther University Halle-Wittenberg, Magdeburger Straße 4, 06097, Halle (Saale), Germany
| | - Joachim Neumann
- Institute for Pharmacology and Toxicology, Medical Faculty, Martin Luther University Halle-Wittenberg, Magdeburger Straße 4, 06097, Halle (Saale), Germany.
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Jacob H, Braekow P, Hofmann B, Kirchhefer U, Forster L, Mönnich D, Humphrys LJ, Pockes S, Neumann J, Gergs U. Ergometrine stimulates histamine H 2 receptors in the isolated human atrium. NAUNYN-SCHMIEDEBERG'S ARCHIVES OF PHARMACOLOGY 2023; 396:3809-3822. [PMID: 37354215 PMCID: PMC10643397 DOI: 10.1007/s00210-023-02573-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Accepted: 06/11/2023] [Indexed: 06/26/2023]
Abstract
Ergometrine (6aR,9R)-N-((S)-1-hydroxypropan-2-yl)-7-methyl-4,6,6a,7,8,9-hexa-hydro-indolo-[4,3-fg]chinolin-9-carboxamide or lysergide acid β-ethanolamide or ergonovine) activates several types of serotonin and histamine receptors in the animal heart. We thus examined whether ergometrine can activate human serotonin 5-HT4 receptors (h5-HT4R) and/or human histamine H2 receptors (hH2R) in the heart of transgenic mice and/or in the human isolated atrium. Force of contraction or beating rates were studied in electrically stimulated left atrial or spontaneously beating right atrial preparations or spontaneously beating isolated retrogradely perfused hearts (Langendorff setup) of mice with cardiac specific overexpression of the h5-HT4R (5-HT4-TG) or of mice with cardiac specific overexpression of the hH2R (H2-TG) or in electrically stimulated human right atrial preparations obtained during cardiac surgery. Western blots to assess phospholamban (PLB) phosphorylation on serine 16 were performed. Ergometrine exerted concentration- and time-dependent positive inotropic effects and positive chronotropic effects in atrial preparations starting at 0.3 µM and reaching a plateau at 10 µM in H2-TGs (n = 7). This was accompanied by an increase in PLB phosphorylation at serine 16. Ergometrine up 10 µM failed to increase force of contraction in left atrial preparations from 5-HT4-TGs (n = 5). Ten micrometer ergometrine increased the force of contraction in isolated retrogradely perfused spontaneously beating heart preparations (Langendorff setup) from H2-TG but not 5-HT4-TG. In the presence of the phosphodiesterase inhibitor cilostamide (1 µM), ergometrine at 10 µM exerted positive inotropic effects in isolated electrically stimulated human right atrial preparations, obtained during cardiac surgery, and these effects were eliminated by 10 µM of the H2R antagonist cimetidine but not by 10 µM of the 5-HT4R antagonist tropisetron. Furthermore, ergometrine showed binding to human histamine H2 receptors (at 100 µM and 1 mM) using HEK cells in a recombinant expression system (pKi < 4.5, n = 3). In conclusion, we suggest that ergometrine is an agonist at cardiac human H2Rs.
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Affiliation(s)
- Hannes Jacob
- Institute for Pharmacology and Toxicology, Medical Faculty, Martin Luther University Halle-Wittenberg, Magdeburger Straße 4, 06097, Halle (Saale), Germany
| | - Pauline Braekow
- Institute for Pharmacology and Toxicology, Medical Faculty, Martin Luther University Halle-Wittenberg, Magdeburger Straße 4, 06097, Halle (Saale), Germany
| | - Britt Hofmann
- Department of Cardiac Surgery, Mid-German Heart Center, University Hospital Halle, Ernst Grube Straße 40, 06097, Halle (Saale), Germany
| | - Uwe Kirchhefer
- Institute for Pharmacology and Toxicology, Medical Faculty, Westfälische Wilhelms- Universität Münster, Domagkstraße 12, 48149, Münster, Germany
| | - Lisa Forster
- Institute of Pharmacy, University of Regensburg, Universitätsstraße 31, 93040, Regensburg, Germany
| | - Denise Mönnich
- Institute of Pharmacy, University of Regensburg, Universitätsstraße 31, 93040, Regensburg, Germany
| | - Laura J Humphrys
- Institute of Pharmacy, University of Regensburg, Universitätsstraße 31, 93040, Regensburg, Germany
| | - Steffen Pockes
- Institute of Pharmacy, University of Regensburg, Universitätsstraße 31, 93040, Regensburg, Germany
| | - Joachim Neumann
- Institute for Pharmacology and Toxicology, Medical Faculty, Martin Luther University Halle-Wittenberg, Magdeburger Straße 4, 06097, Halle (Saale), Germany.
| | - Ulrich Gergs
- Institute for Pharmacology and Toxicology, Medical Faculty, Martin Luther University Halle-Wittenberg, Magdeburger Straße 4, 06097, Halle (Saale), Germany
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Neumann J, Kirchhefer U, Dhein S, Hofmann B, Gergs U. The Roles of Cardiovascular H 2-Histamine Receptors Under Normal and Pathophysiological Conditions. Front Pharmacol 2022; 12:732842. [PMID: 34987383 PMCID: PMC8720924 DOI: 10.3389/fphar.2021.732842] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Accepted: 11/02/2021] [Indexed: 12/11/2022] Open
Abstract
This review addresses pharmacological, structural and functional relationships among H2-histamine receptors and H1-histamine receptors in the mammalian heart. The role of both receptors in the regulation of force and rhythm, including their electrophysiological effects on the mammalian heart, will then be discussed in context. The potential clinical role of cardiac H2-histamine-receptors in cardiac diseases will be examined. The use of H2-histamine receptor agonists to acutely increase the force of contraction will be discussed. Special attention will be paid to the potential role of cardiac H2-histamine receptors in the genesis of cardiac arrhythmias. Moreover, novel findings on the putative role of H2-histamine receptor antagonists in treating chronic heart failure in animal models and patients will be reviewed. Some limitations in our biochemical understanding of the cardiac role of H2-histamine receptors will be discussed. Recommendations for further basic and translational research on cardiac H2-histamine receptors will be offered. We will speculate whether new knowledge might lead to novel roles of H2-histamine receptors in cardiac disease and whether cardiomyocyte specific H2-histamine receptor agonists and antagonists should be developed.
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Affiliation(s)
- Joachim Neumann
- Institut für Pharmakologie und Toxikologie, Medizinische Fakultät, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany
| | - Uwe Kirchhefer
- Institut für Pharmakologie und Toxikologie, Westfälische Wilhelms-Universität, Münster, Germany
| | - Stefan Dhein
- Landratsamt Altenburger Land, Altenburg, Germany
| | - Britt Hofmann
- Herzchirurgie, Medizinische Fakultät, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany
| | - Ulrich Gergs
- Institut für Pharmakologie und Toxikologie, Medizinische Fakultät, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany
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Functional interaction of H 2-receptors and 5HT 4-receptors in atrial tissues isolated from double transgenic mice and from human patients. Naunyn Schmiedebergs Arch Pharmacol 2021; 394:2401-2418. [PMID: 34562141 PMCID: PMC8592968 DOI: 10.1007/s00210-021-02145-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 08/26/2021] [Indexed: 01/08/2023]
Abstract
In the past, we generated transgenic mice that overexpress the human histamine 2 (H2)-receptor (H2-TG) or that overexpress the human serotonin 4 (5-HT4)-receptor (5-HT4-TG) in the heart. Here, we crossbred these lines of mice to generate double transgenic mice that overexpress both receptors (DT). This was done to study a conceivable interaction between these receptors in the mouse heart as a model for the human heart. When in left atria, initially, force of contraction was elevated maximally with 1 µM serotonin, and subsequently, histamine was cumulatively applied; a biphasic effect of histamine was noted: the force of contraction initially decreased, maximally at 10 nM histamine, and thereafter, the force of contraction increased again at 1 µM histamine. Notably, functional interaction between 5-HT and histamine was also identified in isolated electrically stimulated trabeculae carneae from human right atrium (obtained during cardiac surgery). These functional and biochemical data together are consistent with a joint overexpression of inotropically active H2-receptors and 5-HT4-receptors in the same mouse heart. We also describe an antagonistic interaction on the force of contraction of both receptors in the mouse atrium (DT) and in the human atrial muscle strips. We speculate that via this interaction, histamine might act as a "brake" on the cardiac actions of 5-HT via inhibitory GTP-binding proteins acting on the activity of adenylyl cyclase.
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Gergs U, Büxel ML, Bresinsky M, Kirchhefer U, Fehse C, Höring C, Hofmann B, Marušáková M, Čináková A, Schwarz R, Pockes S, Neumann J. Cardiac Effects of Novel Histamine H 2 Receptor Agonists. J Pharmacol Exp Ther 2021; 379:223-234. [PMID: 34535565 DOI: 10.1124/jpet.121.000822] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Accepted: 09/14/2021] [Indexed: 01/17/2023] Open
Abstract
In an integrative approach, we studied cardiac effects of recently published novel H2 receptor agonists in the heart of mice that overexpress the human H2 receptor (H2-TG mice) and littermate wild type (WT) control mice and in isolated electrically driven muscle preparations from patients undergoing cardiac surgery. Under our experimental conditions, the H2 receptor agonists UR-Po563, UR-MB-158, and UR-MB-159 increased force of contraction in left atrium from H2-TG mice with pEC50 values of 8.27, 9.38, and 8.28, respectively, but not in WT mice. Likewise, UR-Po563, UR-MB-158, and UR-MB-159 increased the beating rate in right atrium from H2-TG mice with pEC50 values of 9.01, 9.24, and 7.91, respectively, but not from WT mice. These effects could be antagonized by famotidine, a H2 receptor antagonist. UR-Po563 (1 µM) increased force of contraction in Langendorff-perfused hearts from H2-TG but not WT mice. Similarly, UR-Po563, UR-MB-158, or UR-MB-159 increased the left ventricular ejection fraction in echocardiography of H2-TG mice. Finally, UR-Po563 increased force of contraction in isolated human right atrial muscle strips. The contractile effects of UR-Po563 in H2-TG mice were accompanied by an increase in the phosphorylation state of phospholamban. In summary, we report here three recently developed agonists functionally stimulating human cardiac H2 receptors in vitro and in vivo. We speculate that these compounds might be of some merit to treat neurologic disorders if their cardiac effects are blocked by concomitantly applied receptor antagonists that cannot pass through the blood-brain barrier or might be useful to treat congestive heart failure in patients. SIGNIFICANCE STATEMENT: Recently, a new generation of histamine H2 receptor (H2R) agonists has been developed as possible treatment option for Alzheimer's disease. Here, possible cardiac (side) effects of these novel H2R agonists have been evaluated.
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Affiliation(s)
- Ulrich Gergs
- Institute for Pharmacology and Toxicology (U.G., M.L.B., C.F., M.M., A.C., R.S., J.N.) and Cardiac Surgery (B.H.), Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany; Institute of Pharmacy, University of Regensburg, Regensburg, Germany (M.B., C.H., S.P.); Institute for Pharmacology and Toxicology, University Hospital, Westfälische Wilhelms-Universität, Münster, Germany (U.K.); Department of Pharmacology and Toxicology, Faculty of Pharmacy, Comenius University, Bratislava, Slovakia (M.M., A.C.)
| | - Maren L Büxel
- Institute for Pharmacology and Toxicology (U.G., M.L.B., C.F., M.M., A.C., R.S., J.N.) and Cardiac Surgery (B.H.), Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany; Institute of Pharmacy, University of Regensburg, Regensburg, Germany (M.B., C.H., S.P.); Institute for Pharmacology and Toxicology, University Hospital, Westfälische Wilhelms-Universität, Münster, Germany (U.K.); Department of Pharmacology and Toxicology, Faculty of Pharmacy, Comenius University, Bratislava, Slovakia (M.M., A.C.)
| | - Merlin Bresinsky
- Institute for Pharmacology and Toxicology (U.G., M.L.B., C.F., M.M., A.C., R.S., J.N.) and Cardiac Surgery (B.H.), Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany; Institute of Pharmacy, University of Regensburg, Regensburg, Germany (M.B., C.H., S.P.); Institute for Pharmacology and Toxicology, University Hospital, Westfälische Wilhelms-Universität, Münster, Germany (U.K.); Department of Pharmacology and Toxicology, Faculty of Pharmacy, Comenius University, Bratislava, Slovakia (M.M., A.C.)
| | - Uwe Kirchhefer
- Institute for Pharmacology and Toxicology (U.G., M.L.B., C.F., M.M., A.C., R.S., J.N.) and Cardiac Surgery (B.H.), Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany; Institute of Pharmacy, University of Regensburg, Regensburg, Germany (M.B., C.H., S.P.); Institute for Pharmacology and Toxicology, University Hospital, Westfälische Wilhelms-Universität, Münster, Germany (U.K.); Department of Pharmacology and Toxicology, Faculty of Pharmacy, Comenius University, Bratislava, Slovakia (M.M., A.C.)
| | - Charlotte Fehse
- Institute for Pharmacology and Toxicology (U.G., M.L.B., C.F., M.M., A.C., R.S., J.N.) and Cardiac Surgery (B.H.), Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany; Institute of Pharmacy, University of Regensburg, Regensburg, Germany (M.B., C.H., S.P.); Institute for Pharmacology and Toxicology, University Hospital, Westfälische Wilhelms-Universität, Münster, Germany (U.K.); Department of Pharmacology and Toxicology, Faculty of Pharmacy, Comenius University, Bratislava, Slovakia (M.M., A.C.)
| | - Carina Höring
- Institute for Pharmacology and Toxicology (U.G., M.L.B., C.F., M.M., A.C., R.S., J.N.) and Cardiac Surgery (B.H.), Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany; Institute of Pharmacy, University of Regensburg, Regensburg, Germany (M.B., C.H., S.P.); Institute for Pharmacology and Toxicology, University Hospital, Westfälische Wilhelms-Universität, Münster, Germany (U.K.); Department of Pharmacology and Toxicology, Faculty of Pharmacy, Comenius University, Bratislava, Slovakia (M.M., A.C.)
| | - Britt Hofmann
- Institute for Pharmacology and Toxicology (U.G., M.L.B., C.F., M.M., A.C., R.S., J.N.) and Cardiac Surgery (B.H.), Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany; Institute of Pharmacy, University of Regensburg, Regensburg, Germany (M.B., C.H., S.P.); Institute for Pharmacology and Toxicology, University Hospital, Westfälische Wilhelms-Universität, Münster, Germany (U.K.); Department of Pharmacology and Toxicology, Faculty of Pharmacy, Comenius University, Bratislava, Slovakia (M.M., A.C.)
| | - Margaréta Marušáková
- Institute for Pharmacology and Toxicology (U.G., M.L.B., C.F., M.M., A.C., R.S., J.N.) and Cardiac Surgery (B.H.), Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany; Institute of Pharmacy, University of Regensburg, Regensburg, Germany (M.B., C.H., S.P.); Institute for Pharmacology and Toxicology, University Hospital, Westfälische Wilhelms-Universität, Münster, Germany (U.K.); Department of Pharmacology and Toxicology, Faculty of Pharmacy, Comenius University, Bratislava, Slovakia (M.M., A.C.)
| | - Aneta Čináková
- Institute for Pharmacology and Toxicology (U.G., M.L.B., C.F., M.M., A.C., R.S., J.N.) and Cardiac Surgery (B.H.), Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany; Institute of Pharmacy, University of Regensburg, Regensburg, Germany (M.B., C.H., S.P.); Institute for Pharmacology and Toxicology, University Hospital, Westfälische Wilhelms-Universität, Münster, Germany (U.K.); Department of Pharmacology and Toxicology, Faculty of Pharmacy, Comenius University, Bratislava, Slovakia (M.M., A.C.)
| | - Rebecca Schwarz
- Institute for Pharmacology and Toxicology (U.G., M.L.B., C.F., M.M., A.C., R.S., J.N.) and Cardiac Surgery (B.H.), Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany; Institute of Pharmacy, University of Regensburg, Regensburg, Germany (M.B., C.H., S.P.); Institute for Pharmacology and Toxicology, University Hospital, Westfälische Wilhelms-Universität, Münster, Germany (U.K.); Department of Pharmacology and Toxicology, Faculty of Pharmacy, Comenius University, Bratislava, Slovakia (M.M., A.C.)
| | - Steffen Pockes
- Institute for Pharmacology and Toxicology (U.G., M.L.B., C.F., M.M., A.C., R.S., J.N.) and Cardiac Surgery (B.H.), Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany; Institute of Pharmacy, University of Regensburg, Regensburg, Germany (M.B., C.H., S.P.); Institute for Pharmacology and Toxicology, University Hospital, Westfälische Wilhelms-Universität, Münster, Germany (U.K.); Department of Pharmacology and Toxicology, Faculty of Pharmacy, Comenius University, Bratislava, Slovakia (M.M., A.C.)
| | - Joachim Neumann
- Institute for Pharmacology and Toxicology (U.G., M.L.B., C.F., M.M., A.C., R.S., J.N.) and Cardiac Surgery (B.H.), Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany; Institute of Pharmacy, University of Regensburg, Regensburg, Germany (M.B., C.H., S.P.); Institute for Pharmacology and Toxicology, University Hospital, Westfälische Wilhelms-Universität, Münster, Germany (U.K.); Department of Pharmacology and Toxicology, Faculty of Pharmacy, Comenius University, Bratislava, Slovakia (M.M., A.C.)
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Neumann J, Grobe JM, Weisgut J, Schwelberger HG, Fogel WA, Marušáková M, Wache H, Bähre H, Buchwalow IB, Dhein S, Hofmann B, Kirchhefer U, Gergs U. Histamine can be Formed and Degraded in the Human and Mouse Heart. Front Pharmacol 2021; 12:582916. [PMID: 34045955 PMCID: PMC8144513 DOI: 10.3389/fphar.2021.582916] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Accepted: 04/19/2021] [Indexed: 12/22/2022] Open
Abstract
Histamine is metabolized by several enzymes in vitro and in vivo. The relevance of this metabolism in the mammalian heart in vivo is unclear. However, histamine can exert positive inotropic effects (PIE) and positive chronotropic effects (PCE) in humans via H2-histamine receptors. In transgenic mice (H2-TG) that overexpress the human H2 receptor in cardiomyocytes but not in wild-type littermate mice (WT), histamine induced PIE and PCE in isolated left or right atrial preparations. These H2-TG were used to investigate the putative relevance of histamine degrading enzymes in the mammalian heart. Histidine, the precursor of histamine, increased force of contraction (FOC) in human atrial preparations. Moreover, histamine increased the phosphorylation state of phospholamban in human atrium. Here, we could detect histidine decarboxylase (HDC) and histamine itself in cardiomyocytes of mouse hearts. Moreover, our data indicate that histamine is subject to degradation in the mammalian heart. Inhibition of the histamine metabolizing enzymes diamine oxidase (DAO) and monoamine oxidase (MAO) shifted the concentration response curves for the PIE in H2-TG atria to the left. Moreover, activity of histamine metabolizing enzymes was present in mouse cardiac samples as well as in human atrial samples. Thus, drugs used for other indication (e.g. antidepressants) can alter histamine levels in the heart. Our results deepen our understanding of the physiological role of histamine in the mouse and human heart. Our findings might be clinically relevant because we show enzyme targets for drugs to modify the beating rate and force of the human heart.
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Affiliation(s)
- Joachim Neumann
- Institut für Pharmakologie und Toxikologie, Medizinische Fakultät, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany
| | - Juliane M Grobe
- Institut für Pharmakologie und Toxikologie, Medizinische Fakultät, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany
| | - Jacqueline Weisgut
- Institut für Pharmakologie und Toxikologie, Medizinische Fakultät, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany
| | - Hubert G Schwelberger
- Department of Visceral, Transplant and Thoracic Surgery, Molecular Biology Laboratory, Medical University Innsbruck, Innsbruck, Austria
| | | | - Margaréta Marušáková
- Institut für Pharmakologie und Toxikologie, Medizinische Fakultät, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany
| | - Hartmut Wache
- Institut für Pharmakologie und Toxikologie, Medizinische Fakultät, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany
| | - Heike Bähre
- Research Core Unit Metabolomics and Institute of Pharmacology, Hannover Medical School, Hannover, Germany
| | | | - Stefan Dhein
- Klinik für Herzchirurgie, Herzzentrum der Universität Leipzig, Leipzig, Germany
| | - Britt Hofmann
- Department of Cardiothoracic Surgery, Heart Centre of the University Clinics Halle (Saale), Martin-Luther-University Halle-Wittenberg, Halle, Germany
| | - Uwe Kirchhefer
- Institut für Pharmakologie und Toxikologie, Universitätsklinikum Münster, Westfälische Wilhelms-Universität, Münster, Germany
| | - Ulrich Gergs
- Institut für Pharmakologie und Toxikologie, Medizinische Fakultät, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany
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Neumann J, Binter MB, Fehse C, Marušáková M, Büxel ML, Kirchhefer U, Hofmann B, Gergs U. Amitriptyline functionally antagonizes cardiac H 2 histamine receptors in transgenic mice and human atria. Naunyn Schmiedebergs Arch Pharmacol 2021; 394:1251-1262. [PMID: 33625558 PMCID: PMC8208937 DOI: 10.1007/s00210-021-02065-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Accepted: 02/09/2021] [Indexed: 11/29/2022]
Abstract
We have previously shown that histamine (2-(1H-imidazol-4-yl)ethanamine) exerted concentration-dependent positive inotropic effects (PIE) or positive chronotropic effects (PCE) on isolated left and right atria, respectively, of transgenic (H2R-TG) mice that overexpress the human H2 histamine receptor (H2R) in the heart; however, the effects were not seen in their wild-type (WT) littermates. Amitriptyline, which is still a highly prescribed antidepressant drug, was reported to act as antagonist on H2Rs. Here, we wanted to determine whether the histamine effects in H2R-TG were antagonized by amitriptyline. Contractile studies were performed on isolated left and right atrial preparations, isolated perfused hearts from H2R-TG and WT mice and human atrial preparations. Amitriptyline shifted the concentration-dependent PIE of histamine (1 nM-10 μM) to higher concentrations (rightward shift) in left atrial preparations from H2R-TG. Similarly, in isolated perfused hearts from H2R-TG and WT mice, histamine increased the contractile parameters and the phosphorylation state of phospholamban (PLB) at serine 16 in the H2R-TG mice, but not in the WT mice. However, the increases in contractility and PLB phosphorylation were attenuated by the addition of amitriptyline in perfused hearts from H2R-TG. In isolated electrically stimulated human atria, the PIE of histamine that was applied in increasing concentrations from 1 nM to 10 μM was reduced by 10-μM amitriptyline. In summary, we present functional evidence that amitriptyline also acts as an antagonist of contractility at H2Rs in H2R-TG mouse hearts and in the human heart which might in part explain the side effects of amitriptyline.
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Affiliation(s)
- Joachim Neumann
- Institut für Pharmakologie und Toxikologie, Medizinische Fakultät, Martin-Luther-Universität Halle-Wittenberg, D-06097, Halle, Germany
| | - Maximilian Benedikt Binter
- Institut für Pharmakologie und Toxikologie, Medizinische Fakultät, Martin-Luther-Universität Halle-Wittenberg, D-06097, Halle, Germany
| | - Charlotte Fehse
- Institut für Pharmakologie und Toxikologie, Medizinische Fakultät, Martin-Luther-Universität Halle-Wittenberg, D-06097, Halle, Germany
| | - Margaréta Marušáková
- Institut für Pharmakologie und Toxikologie, Medizinische Fakultät, Martin-Luther-Universität Halle-Wittenberg, D-06097, Halle, Germany.,Department of Pharmacology and Toxicology, Faculty of Pharmacy, Comenius University in Bratislava, Bratislava, Slovakia
| | - Maren Luise Büxel
- Institut für Pharmakologie und Toxikologie, Medizinische Fakultät, Martin-Luther-Universität Halle-Wittenberg, D-06097, Halle, Germany
| | - Uwe Kirchhefer
- Institut für Pharmakologie und Toxikologie, Medizinische Fakultät, Westfälische Wilhelms-Universität, Domagkstr. 12, D-48149, Münster, Germany
| | - Britt Hofmann
- Cardiac Surgery, Medizinische Fakultät, Martin-Luther-Universität Halle-Wittenberg, D-06120, Halle, Germany
| | - Ulrich Gergs
- Institut für Pharmakologie und Toxikologie, Medizinische Fakultät, Martin-Luther-Universität Halle-Wittenberg, D-06097, Halle, Germany.
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Gergs U, Bernhardt G, Buchwalow IB, Edler H, Fröba J, Keller M, Kirchhefer U, Köhler F, Mißlinger N, Wache H, Neumann J. Initial Characterization of Transgenic Mice Overexpressing Human Histamine H 2 Receptors. J Pharmacol Exp Ther 2019; 369:129-141. [PMID: 30728249 DOI: 10.1124/jpet.118.255711] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Accepted: 01/25/2019] [Indexed: 11/22/2022] Open
Abstract
In an integrative approach, we studied the role of histamine H2 receptors in the mouse heart. We noted that histamine, added cumulatively to the organ bath, failed to affect the force of contraction in left atrial preparations and did not change spontaneous heart rate in right atrial preparations from wild-type mice. By contrast, in the same preparations from mice that overexpressed the human H2 receptor in a cardiac-specific way, histamine exerted concentration- and time-dependent positive inotropic and positive chronotropic effects. Messenger RNA of the human H2 receptor was only detected in transgenic mice. Likewise, immunohistology and autoradiography only gave signals in transgenic but not in wild-type cardiac preparations. Similarly, a positive inotropic and positive chronotropic effect was observed with histamine in echocardiography of living transgenic mice and isolated perfused hearts (Langendorff preparation). Phosphorylation of phospholamban was increased in atrial and ventricular preparations from transgenic mice, but not in wild-type animals. The effects of histamine were mimicked by dimaprit and amthamine and antagonized by cimetidine. In summary, we generated a new model to study the physiologic and pathophysiologic cardiac role of the human H2 receptor.
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Affiliation(s)
- U Gergs
- Institute for Pharmacology and Toxicology, Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany (U.G., H.E., J.F., F.K., N.M., H.W., J.N.); Institute of Pharmacy, University of Regensburg, Regensburg, Germany (G.B., M.K.); Institute for Hematopathology, Hamburg, Germany (I.B.B.); and Institute for Pharmacology and Toxicology, University Hospital Münster, Westfälische Wilhelms-University, Münster, Germany (U.K.)
| | - G Bernhardt
- Institute for Pharmacology and Toxicology, Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany (U.G., H.E., J.F., F.K., N.M., H.W., J.N.); Institute of Pharmacy, University of Regensburg, Regensburg, Germany (G.B., M.K.); Institute for Hematopathology, Hamburg, Germany (I.B.B.); and Institute for Pharmacology and Toxicology, University Hospital Münster, Westfälische Wilhelms-University, Münster, Germany (U.K.)
| | - I B Buchwalow
- Institute for Pharmacology and Toxicology, Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany (U.G., H.E., J.F., F.K., N.M., H.W., J.N.); Institute of Pharmacy, University of Regensburg, Regensburg, Germany (G.B., M.K.); Institute for Hematopathology, Hamburg, Germany (I.B.B.); and Institute for Pharmacology and Toxicology, University Hospital Münster, Westfälische Wilhelms-University, Münster, Germany (U.K.)
| | - H Edler
- Institute for Pharmacology and Toxicology, Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany (U.G., H.E., J.F., F.K., N.M., H.W., J.N.); Institute of Pharmacy, University of Regensburg, Regensburg, Germany (G.B., M.K.); Institute for Hematopathology, Hamburg, Germany (I.B.B.); and Institute for Pharmacology and Toxicology, University Hospital Münster, Westfälische Wilhelms-University, Münster, Germany (U.K.)
| | - J Fröba
- Institute for Pharmacology and Toxicology, Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany (U.G., H.E., J.F., F.K., N.M., H.W., J.N.); Institute of Pharmacy, University of Regensburg, Regensburg, Germany (G.B., M.K.); Institute for Hematopathology, Hamburg, Germany (I.B.B.); and Institute for Pharmacology and Toxicology, University Hospital Münster, Westfälische Wilhelms-University, Münster, Germany (U.K.)
| | - M Keller
- Institute for Pharmacology and Toxicology, Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany (U.G., H.E., J.F., F.K., N.M., H.W., J.N.); Institute of Pharmacy, University of Regensburg, Regensburg, Germany (G.B., M.K.); Institute for Hematopathology, Hamburg, Germany (I.B.B.); and Institute for Pharmacology and Toxicology, University Hospital Münster, Westfälische Wilhelms-University, Münster, Germany (U.K.)
| | - U Kirchhefer
- Institute for Pharmacology and Toxicology, Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany (U.G., H.E., J.F., F.K., N.M., H.W., J.N.); Institute of Pharmacy, University of Regensburg, Regensburg, Germany (G.B., M.K.); Institute for Hematopathology, Hamburg, Germany (I.B.B.); and Institute for Pharmacology and Toxicology, University Hospital Münster, Westfälische Wilhelms-University, Münster, Germany (U.K.)
| | - F Köhler
- Institute for Pharmacology and Toxicology, Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany (U.G., H.E., J.F., F.K., N.M., H.W., J.N.); Institute of Pharmacy, University of Regensburg, Regensburg, Germany (G.B., M.K.); Institute for Hematopathology, Hamburg, Germany (I.B.B.); and Institute for Pharmacology and Toxicology, University Hospital Münster, Westfälische Wilhelms-University, Münster, Germany (U.K.)
| | - N Mißlinger
- Institute for Pharmacology and Toxicology, Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany (U.G., H.E., J.F., F.K., N.M., H.W., J.N.); Institute of Pharmacy, University of Regensburg, Regensburg, Germany (G.B., M.K.); Institute for Hematopathology, Hamburg, Germany (I.B.B.); and Institute for Pharmacology and Toxicology, University Hospital Münster, Westfälische Wilhelms-University, Münster, Germany (U.K.)
| | - H Wache
- Institute for Pharmacology and Toxicology, Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany (U.G., H.E., J.F., F.K., N.M., H.W., J.N.); Institute of Pharmacy, University of Regensburg, Regensburg, Germany (G.B., M.K.); Institute for Hematopathology, Hamburg, Germany (I.B.B.); and Institute for Pharmacology and Toxicology, University Hospital Münster, Westfälische Wilhelms-University, Münster, Germany (U.K.)
| | - J Neumann
- Institute for Pharmacology and Toxicology, Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany (U.G., H.E., J.F., F.K., N.M., H.W., J.N.); Institute of Pharmacy, University of Regensburg, Regensburg, Germany (G.B., M.K.); Institute for Hematopathology, Hamburg, Germany (I.B.B.); and Institute for Pharmacology and Toxicology, University Hospital Münster, Westfälische Wilhelms-University, Münster, Germany (U.K.)
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9
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Hilleman DE, Mohiuddin SM, Williams MA, Gannon JM, Mathias RJ, Thalken LJ. Impact of Chronic Oral H2-Antagonist Therapy on Left Ventricular Systolic Function and Exercise Capacity. J Clin Pharmacol 2013; 32:1033-7. [PMID: 1361935 DOI: 10.1002/j.1552-4604.1992.tb03807.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
It has been suggested that H2-antagonists may adversely affect left ventricular systolic function. To assess the effects of cimetidine, famotidine, and ranitidine on exercise capacity and left ventricular systolic function, the authors conducted a randomized, double-blind, four-way crossover study in 15 healthy male volunteers with placebo control. Each subject underwent a maximal upright treadmill exercise test, aerobic metabolic assessment, and two-dimensional stress echocardiography on six separate occasions. The initial two treadmill exercise tests with aerobic metabolic assessment and stress echocardiography were performed to minimize the learning effect. In the final four evaluations, subjects were randomized to receive 7 days of oral treatment with cimetidine 400 mg twice daily, famotidine 40 mg daily, ranitidine 150 mg twice daily, and placebo. A comparison of exercise tests, aerobic metabolic assessment, and stress echocardiography results found no significant differences between any of the H2-antagonists and placebo. In addition, there were no significant differences in test results between cimetidine, famotidine, and ranitidine. Specifically, exercise treadmill time, maximal oxygen consumption, respiratory quotient, maximal exercise systolic and diastolic blood pressure, maximal exercise heart rate, left ventricular end-diastolic dimension, left ventricular end-systolic dimension, and ejection fraction were not different between treatments. The authors conclude that 7 days of oral treatment with cimetidine, famotidine, or ranitidine has no deleterious effect on exercise capacity or left ventricular systolic function in healthy subjects.
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Affiliation(s)
- D E Hilleman
- Creighton University Cardiac Center, Omaha, Nebraska
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Ghorai P, Kraus A, Keller M, Götte C, Igel P, Schneider E, Schnell D, Bernhardt G, Dove S, Zabel M, Elz S, Seifert R, Buschauer A. Acylguanidines as Bioisosteres of Guanidines: NG-Acylated Imidazolylpropylguanidines, a New Class of Histamine H2 Receptor Agonists. J Med Chem 2008; 51:7193-204. [DOI: 10.1021/jm800841w] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Prasanta Ghorai
- Departments of Pharmaceutical/Medicinal Chemistry, Pharmacology and Toxicology, Center for Chemical Analysis, Faculty of Chemistry and Pharmacy, University of Regensburg, Universitätsstrasse 31, D-93053 Regensburg, Germany
| | - Anja Kraus
- Departments of Pharmaceutical/Medicinal Chemistry, Pharmacology and Toxicology, Center for Chemical Analysis, Faculty of Chemistry and Pharmacy, University of Regensburg, Universitätsstrasse 31, D-93053 Regensburg, Germany
| | - Max Keller
- Departments of Pharmaceutical/Medicinal Chemistry, Pharmacology and Toxicology, Center for Chemical Analysis, Faculty of Chemistry and Pharmacy, University of Regensburg, Universitätsstrasse 31, D-93053 Regensburg, Germany
| | - Carsten Götte
- Departments of Pharmaceutical/Medicinal Chemistry, Pharmacology and Toxicology, Center for Chemical Analysis, Faculty of Chemistry and Pharmacy, University of Regensburg, Universitätsstrasse 31, D-93053 Regensburg, Germany
| | - Patrick Igel
- Departments of Pharmaceutical/Medicinal Chemistry, Pharmacology and Toxicology, Center for Chemical Analysis, Faculty of Chemistry and Pharmacy, University of Regensburg, Universitätsstrasse 31, D-93053 Regensburg, Germany
| | - Erich Schneider
- Departments of Pharmaceutical/Medicinal Chemistry, Pharmacology and Toxicology, Center for Chemical Analysis, Faculty of Chemistry and Pharmacy, University of Regensburg, Universitätsstrasse 31, D-93053 Regensburg, Germany
| | - David Schnell
- Departments of Pharmaceutical/Medicinal Chemistry, Pharmacology and Toxicology, Center for Chemical Analysis, Faculty of Chemistry and Pharmacy, University of Regensburg, Universitätsstrasse 31, D-93053 Regensburg, Germany
| | - Günther Bernhardt
- Departments of Pharmaceutical/Medicinal Chemistry, Pharmacology and Toxicology, Center for Chemical Analysis, Faculty of Chemistry and Pharmacy, University of Regensburg, Universitätsstrasse 31, D-93053 Regensburg, Germany
| | - Stefan Dove
- Departments of Pharmaceutical/Medicinal Chemistry, Pharmacology and Toxicology, Center for Chemical Analysis, Faculty of Chemistry and Pharmacy, University of Regensburg, Universitätsstrasse 31, D-93053 Regensburg, Germany
| | - Manfred Zabel
- Departments of Pharmaceutical/Medicinal Chemistry, Pharmacology and Toxicology, Center for Chemical Analysis, Faculty of Chemistry and Pharmacy, University of Regensburg, Universitätsstrasse 31, D-93053 Regensburg, Germany
| | - Sigurd Elz
- Departments of Pharmaceutical/Medicinal Chemistry, Pharmacology and Toxicology, Center for Chemical Analysis, Faculty of Chemistry and Pharmacy, University of Regensburg, Universitätsstrasse 31, D-93053 Regensburg, Germany
| | - Roland Seifert
- Departments of Pharmaceutical/Medicinal Chemistry, Pharmacology and Toxicology, Center for Chemical Analysis, Faculty of Chemistry and Pharmacy, University of Regensburg, Universitätsstrasse 31, D-93053 Regensburg, Germany
| | - Armin Buschauer
- Departments of Pharmaceutical/Medicinal Chemistry, Pharmacology and Toxicology, Center for Chemical Analysis, Faculty of Chemistry and Pharmacy, University of Regensburg, Universitätsstrasse 31, D-93053 Regensburg, Germany
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11
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Dove S, Buschauer A. Imidazolylpropylguanidines as histamine H2 receptor agonists:3D-QSAR of a large series. PHARMACEUTICA ACTA HELVETIAE 1998; 73:145-55. [PMID: 9713259 DOI: 10.1016/s0031-6865(98)00015-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Imidazolylpropylguanidines are potent histamine H2 receptor agonists and act as inotropic vasodilators. A large series of 141 derivatives was tested in the isolated guinea pig atrium and submitted to CoMFA. Since all compounds are full compounds are full agonists, pD2 values reflect H2 receptor binding. Hydrophobicity was considered as sigma f of the variable structural moiety, calculated by the Leo-Hansch method. Preliminary Hansch analysis with sigma f, (sigma f)2 and indicator variables showed that pD(2) additively depends on contributions of certain substructures and has a hydrophobic optimum. For CoMFA, all 3D structures were optimized and aligned. Partial Least Squares analysis of pD2 as function of steric and electrostatic field variables and of sigma f and (sigma f)2 led to models with r(2) of 0.78 with and 0.93 without hydrophobicity. Results indicate a parabolic dependence of pD(2) on hydrophobic effects. The 3D distribution of field influences on pD(2) suggests a model (shape and electrostatic potential) of the binding site. The role of branching and different substituent effects of a first and a second ring indicate that adequately branched structures induce a conformational change of the binding site enabling a favourable accommodation of the second ring with various substituents.
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Affiliation(s)
- S Dove
- University Regensburg, Institute of Pharmacy, Germany.
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12
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Schuster A, Bernhardt G, Buschauer A. Determination of the arpromidine-type histamine H2-receptor agonist N1-[3-(3,4-difluorophenyl)-3-(2-pyridyl)propyl]-N2-[3-(1H-imidazol-4-yl)propyl]guanidine and corresponding N3-alkoxycarbonylguanidines by HPLC and CE. Eur J Pharm Sci 1997. [DOI: 10.1016/s0928-0987(96)00258-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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13
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Glass D, Buschauer A, Tenor H, Bartel S, Will-Shahab L, Krause EG. 4-(4-Guanidinobenzoyl)-2-imidazolones and related compounds: phosphodiesterase inhibitors and novel cardiotonics with combined histamine H2 receptor agonist and PDE III inhibitor activity. Arch Pharm (Weinheim) 1995; 328:709-19. [PMID: 8554460 DOI: 10.1002/ardp.19953281005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
A series of new positive inotropic agents was synthesized with the aim of combining the pharmacophores of the imidazolone-type phosphodiesterase (PDE) inhibitor enoximone and guanidine-type histamine H2 receptor agonists such as arpromidine. All compounds are para-substituted 4-benzoyl-5-alkyl-2-imidazolones. H2 agonism was incorporated by p-(hetero)arylalkyl substituents, in particular by an imidazolylpropyl guanidine group. In addition analogous ureas, cyanoguanidines, alkyl guanidine carboxylates, and amides were prepared. These functional groups were either directly attached to the phenyl ring or linked by an appropriate spacer. The compounds were screened for positive inotropic activity in the isolated electrically stimulated guinea pig papillary muscle and for inhibition of PDE III (cGMP-inhibited cAMP PDE, isolated from guinea pig heart). The cardiotonics obtained proved to be either PDE III inhibitors, some of them surmounting up to 3-fold the potency of enoximone, or pharmacological hybrids combining both PDE III inhibitor and histamine H2 receptor agonist activities. These hybrids were the most potent positive inotropic substances at the papillary muscle, probably due to their synergistic mechanism of action. The participation of histamine H2 receptors could be demonstrated in the papillary muscle preparation by pretreatment with the H2 antagonist famotidine (10 microM) as well as by further pharmacological experiments using isolated perfused hearts of guinea pigs and rats, isolated guinea pig right atria, adenylyl cyclase and H2 receptor binding assays. At equieffective concentrations the moderate PDE III inhibitor and histamine H2 agonist N1-(4-[(1,3-dihydro-5-methyl-2-oxo-3H-imidazol-4-yl)-carbonyl]phenyl)-N2 - [3-(1H-imidazol-4-yl)propyl]guanidine 65 and the 5-ethyl homologue 66 were about 2 and 10 times more potent than enoximone at the papillary muscle. Moreover, both compounds produced a 2.5-fold higher maximal response than the reference compound.
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Affiliation(s)
- D Glass
- Institut für Pharmazie, Universität Regensburg, Germany
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14
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Zingel V, Leschke C, Schunack W. Developments in histamine H1-receptor agonists. PROGRESS IN DRUG RESEARCH. FORTSCHRITTE DER ARZNEIMITTELFORSCHUNG. PROGRES DES RECHERCHES PHARMACEUTIQUES 1995; 44:49-85. [PMID: 7644667 DOI: 10.1007/978-3-0348-7161-7_2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- V Zingel
- Byk Gulden Lomberg Chemische Fabrik, Konstanz, Germany
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Poli E, Pozzoli C, Spaggiari I, Bertaccini G. Positive inotropic activity of the novel histamine H2-receptor agonist, amthamine, on the human heart in vitro. GENERAL PHARMACOLOGY 1994; 25:1649-54. [PMID: 7721041 DOI: 10.1016/0306-3623(94)90367-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
1. We tested the novel thiazole derivative, amthamine, for its ability to stimulate histamine H2-receptors in the human myocardium. 2. Experiments were carried out on isolated, electrically-driven pectinate muscle segments, excised from atrial appendages of patients undergoing corrective heart surgery. 3. Amthamine (0.3-100 microM) induced a positive inotropic activity, resembling histamine in terms of potency and efficacy. In comparison, impromidine was 10-30 times more active than histamine and amthamine, but its maximum effect was significantly lower, while dimaprit was as effective as histamine, but 10 times less potent. 4. The selective histamine H2-blocker, famotidine antagonized in a competitive fashion the amthamine-induced positive inotropic effect. pA2 value of famotidine against amthamine (7.21 +/- 0.45) was close to that measured against histamine (6.88 +/- 0.31) in the same conditions. 5. The effect of amthamine was not modified by beta-adrenoceptor blockade, excluding direct or indirect sympathomimetic activities of the compound. 6. These data provide evidence that amthamine is a selective and full acting histamine H2-receptor agonist in the human heart in vitro.
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Affiliation(s)
- E Poli
- Institute of Pharmacology, University of Parma, School of Medicine, Italy
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16
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Christiaans JAM, Windhorst AD, van der Goot H, Timmerman H. Synthesis and in vitro pharmacology of a series of hybrid molecules possessing 1,4-dihydropyridine calcium-channel blocking activity and histamine H2-agonistic properties. Eur J Med Chem 1994. [DOI: 10.1016/0223-5234(94)90150-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Solomon SD, Wolff S, Jarboe LA, Wolfe MM, Lee RT. Effects of histamine type 2-receptor antagonists cimetidine and famotidine on left ventricular systolic function in chronic congestive heart failure. Am J Cardiol 1993; 72:1163-6. [PMID: 8237807 DOI: 10.1016/0002-9149(93)90987-n] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Twelve patients with stable congestive heart failure and left ventricular dysfunction were enrolled in a double-blind, randomized crossover trial of famotidine, cimetidine and placebo to determine whether histamine type 2 (H2) antagonists adversely affect left ventricular systolic performance. Two-dimensional echocardiograms were obtained at baseline, after 4 days of oral treatment with standard doses of famotidine and cimetidine, and placebo, and at the conclusion of the trial. The baseline mean ejection fraction was 19 +/- 7%. The changes in ejection fraction were +2 +/- 11% (95% confidence interval [CI] -5 to 9%) with famotidine, +3 +/- 10% (95% CI -3 to 10%) with cimetidine, and -3 +/- 7% (95% CI -8 to 2%) with placebo. There were no significant differences in changes in ejection fraction among the 3 experimental treatments (p = 0.22; analysis of variance). The changes in end-systolic wall stress/volume ratios from baseline were +6 +/- 21% (95% CI -6 to 18%) for famotidine, +8 +/- 29% (95% CI -8 to 25%) for cimetidine, and +2% +/- 29% (95% CI -15 to 18%) for placebo (p = 0.69; analysis of variance). No patient had a worsening of symptoms during therapy. Despite previous reports that H2 antagonists may depress left ventricular systolic function, at standard doses these agents result in no decrease in left ventricular systolic function in patients with chronic congestive heart failure.
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Affiliation(s)
- S D Solomon
- Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115
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18
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Abstract
Intensive care patients often require inotropic support to stabilise circulation and to optimise oxygen supply. In this context, the catecholamines norepinephrine (noradrenaline), epinephrine (adrenaline), dopamine and dobutamine are still the mainstay of therapy. They provide, to different extents, a variety of adrenoceptor-mediated actions comprising vasoconstriction (via alpha-receptors) as well as vasodilatation (via beta 1-receptors), and an increase in cardiac output by enhancing inotropy and heart rate (again via beta 1-receptors). Because of their favourable pharmacokinetic profile (plasma half-lives of about 2 minutes) their actions can easily be controlled. Combinations of different catecholamines with each other or with other drugs such as phosphodiesterase inhibitors or nitrates lead to a broad spectrum of possible haemodynamic actions. However, the use of catecholamines is limited by side effects like tachycardia, hypertension and disturbances of organ perfusion caused by vasoconstriction. Furthermore, as a result of receptor downregulation during long term therapy, the efficacy of catecholamine treatment decreases. These shortfalls stimulated the search for alternatives to catecholamine treatment. Among these, phosphodiesterase inhibitors (e.g. enoximone and amrinone) appear to be the most promising drugs which have been introduced into acute clinical practice up to now. They act via inhibition of the phosphodiesterase isoenzyme III, leading to higher intracellular calcium levels by increasing cyclic adenosine monophosphate (cAMP) levels. These agents improve cardiac performance by enhancing contractility, reducing left ventricular afterload and improve diastolic relaxation. In cases of failing catecholamine therapy due to receptor downregulation, treatment with phosphodiesterase inhibitors may still be effective since their action is not receptor-mediated. Inhibition of the phosphodiesterase enzyme in vascular smooth muscle leads to vasodilatation. Therefore, in low cardiac output states combined with increased total peripheral or pulmonary vascular resistance, phosphodiesterase inhibitor therapy is particularly effective. Depending on the dosage and the speed of intravenous administration, the use of phosphodiesterase inhibitors sometimes results in pronounced decrease of blood pressure which may require vasopressor therapy. Other drugs including histamine H2-agonists are currently under investigation. Their value in the treatment of intensive care patients has still to be evaluated.
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Affiliation(s)
- P J Kulka
- Universitätsklinik für Anaesthesiologie, Intensiv- und Schmerztherapie, Berufsgenossenschaftliche Krankenanstalten Bergmannsheil, Bochum, Federal Republic of Germany
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Buschauer A, Friese-Kimmel A, Baumann G, Schunack W. Synthesis and histamine H2 agonistic activity of arpromidine analogues: replacement of the pheniramine-like moiety by non-heterocyclic groups. Eur J Med Chem 1992. [DOI: 10.1016/0223-5234(92)90145-q] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Baumann G, Buschauer A, Felix S. Hemodynamic profile of arpromidine and its F2-substituted derivatives in comparison to impromidine in congestive heart failure. ACTA ACUST UNITED AC 1992. [DOI: 10.1007/bf01997365] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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21
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Borow KM, Ehler D, Berlin R, Neumann A. Influence of histamine receptors on basal left ventricular contractile tone in humans: Assessment using the H2receptor antagonist famotidine and the beta-adrenoceptor antagonist esmolol as pharmacologic probes. J Am Coll Cardiol 1992; 19:1229-36. [PMID: 1348751 DOI: 10.1016/0735-1097(92)90329-l] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Histamine has a positive inotropic action in humans. Recent controversial data have suggested that histamine2 (H2) receptor blockade depresses overall left ventricular systolic performance in healthy volunteers. To explore the possibility that H2 receptors positively influence basal left ventricular contractile tone, 10 normal subjects were studied by using imaging and Doppler echocardiography and calibrated subclavian pulse data in a blinded, randomized, two-period crossover trial with measurements obtained at the end of each 7-day period. Oral drug administration consisted of either the potent H2 antagonist famotidine (40 mg/day) or placebo. Left ventricular circumferential end-systolic wall stress-rate-corrected velocity of fiber shortening (Vcfc) relations were generated over a range of loads with methoxamine. Contractility was assessed by using Vcfc at a common end-systolic wall stress. During each study, data were obtained before and during high dose intravenous esmolol administration to determine the contributions, if any, of sympathetic reflex responses. Famotidine did not alter blood pressure, left ventricular percent fractional shortening, circumferential end-systolic wall stress, stroke volume index, cardiac index, total vascular resistance or ventricular contractile state in comparison with placebo but did decrease heart rate by 3 beats/min (p less than 0.05). With beta-adrenergic blockade, no differences in contractility were evident between esmolol alone and famotidine plus esmolol. Thus, H2 receptor blockade with famotidine does not alter myocardial mechanics or cardiac sympathetic tone, suggesting that in humans basal left ventricular contractile state is not physiologically dependent on the H2-mediated effects of histamine.
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Affiliation(s)
- K M Borow
- Department of Medicine, University of Chicago Medical Center, Illinois 60637
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Buschauer A, Baumann G. Structure-activity relationships of histamine H2-agonists, a new class of positive inotropic drugs. AGENTS AND ACTIONS. SUPPLEMENTS 1991; 33:231-56. [PMID: 1828931 DOI: 10.1007/978-3-0348-7309-3_15] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The cimetidine-like moiety in impromidine was replaced by either alternative partial structures known from H2-antagonists or by H2-nonspecific lipophilic groups. The most potent H2-agonists were found in a series of compounds structurally derived from the H1-antagonist pheniramine. Arpromidine (N1-[3-(4-fluorophenyl)-3-(2-pyridinyl)propyl]-N2-[3-(1H-imidazol-4- yl)propyl]guanidine) may be considered a new lead for the development of "cardiohistaminergics". This guanidine combines both about 100 times the potency of histamine in the isolated guinea-pig atrium (pD2 = 8.0) and H1-antagonistic activity (pA2 = 7.65) in the range of pheniramine. Analogues difluorinated in 3,4-(BU-E-75) or 3,5-position (BU-E-76) or chlorinated in 3,4-position (BU-E-64) are up to 160 times more potent H2-agonists than histamine. In contrast to other types of guanidines, in the arpromidine series the order of potency found in guinea-pig atria was in good agreement with the results from isolated perfused guinea-pig hearts. In particular, the two-fold halogenated arpromidine analogues proved to be more potent positive inotropic agents than impromidine with lower stimulating effects on heart rate and reduced arrhythmogenic properties.
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Affiliation(s)
- A Buschauer
- Institute of Pharmacy, Freie Universität Berlin, FRG
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Felix SB, Buschauer A, Baumann G. Therapeutic value of H2-receptor stimulation in congestive heart failure. Hemodynamic effects of BU-E-76, BU-E-75 and arpromidine (BU-E-50) in comparison to impromidine. AGENTS AND ACTIONS. SUPPLEMENTS 1991; 33:257-69. [PMID: 1828932 DOI: 10.1007/978-3-0348-7309-3_16] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Previous studies from our department revealed that congestive heart failure (CHF) is paralleled by a decrease in number of sarcolemmal beta-receptors due to excessive levels of circulating endogenous catecholamines. In contrast, the myocardial H2-receptor system proved to be not affected (Am. Heart J. 101; 569, 1981). The first clinically tested specific H2-receptor agonist impromidine (IMP) turned out to be a potent stimulator in patients with CHF which were insensitive to catecholamine stimulation (Pharmacol. Ther. 24; 165, 1984). Though the overall results of such an H2-receptor stimulation were salutary with favourable hemodynamic effects, the narrow therapeutic range, high costs of synthesis and the arrhythmogenic potential of IMP limited its broad clinical application in large scale trials. - Recently developed phenylpyridylalkylguanidines (J. Med. Chem. 32, 1963, 1989) were investigated under in vitro and in vivo conditions in the guinea-pig under physiologic and pathophysiologic conditions using IMP as reference. - Compounds tested were arpromidine (INN) (BU-E-50) and the difluorinated analogues BU-E-75 and BU-E-76, all guanidine-type H2-agonists with additional H1-antagonistic properties due to a pheniramine like moiety. In the isolated perfused heart all three new compounds were more potent in increasing cardiac contractile force and coronary flow but less effective on heart rate and less arrhythmogenic. The same could be established under in vivo conditions where BU-E-76 was more potent than BU-E-75, arpromidine and IMP, respectively, in augmenting LVdp/dt, LVP, cardiac output and systemic blood pressure, but all compounds revealed to have less chronotropic and arrhythmogenic potentials. In the vasopressin-induced acute heart failure model BU-E-76 and BU-E-75 normalized all contractile parameters in contrast to arpromidine and IMP. Within minutes it is concluded that the new H2-receptor agonists may represent a promising therapeutic improvement for treatment of CHF patients with a cardiovascular profile superior to IMP and conventional catecholamines.
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Affiliation(s)
- S B Felix
- I. Medical Clinic, Division Cardiology and Circulation, Technical University of Munich, FRG
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Gopalakrishnan M, Triggle DJ. The Regulation of Receptors, Ion Channels, and G Proteins in Congestive Heart Failure. ACTA ACUST UNITED AC 1990. [DOI: 10.1111/j.1527-3466.1990.tb00397.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Abstract
Although known for more than 80 years, histamine still remains a fascinating substance for allergy research. Histamine antagonists have been in clinical use since 1942. The classical H1-antagonists with sedative side-effects have been more or less replaced by newer non-sedating H1-antagonists; the role of H2-receptors in allergic diseases is still controversial. There, are however, increasing reports of beneficial effects of H2-antagonists, mostly in combination with H1-antagonists, in a variety of allergic and pseudoallergic conditions such as chronic urticaria, anaphylactoid reactions due to colloid volume substitutes, opioid analgesics and radiographic contrast media. The combined use of H1- and H2-antagonists might not only act as specific histamine antagonism but exert a mast cell stabilizing effect, as demonstrated in animal experiments and some clinical studies. Future research will show whether the combined use of H1- and H2-antagonists will become a routine therapeutic procedure in allergy therapy.
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Affiliation(s)
- J Ring
- Dermatologische Klinik und Poliklinik, Ludwig-Maximilians-Universität München, FRG
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An investigation of the minimal requirements for H2-receptor agonists: a computational study of N-(3-aminopropyl)formamidine tautomerism. Eur J Med Chem 1989. [DOI: 10.1016/0223-5234(89)90114-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Buschauer A. [Synthesis of positive inotropic substances: imidazolylpropylguanidines with partial pyridine structure]. Arch Pharm (Weinheim) 1988; 321:415-8. [PMID: 3219057 DOI: 10.1002/ardp.19883210709] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Buschauer A. [Synthesis of positive intropic substances: aryloxyalkylguanidines]. Arch Pharm (Weinheim) 1988; 321:281-5. [PMID: 3421818 DOI: 10.1002/ardp.19883210509] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Owens AH, Goehring R, Lampe JW, Erhardt PW, Lumma WC, Wiggins J. Cardiotonic agents 4. Dimaprit analogues as potential cardiovascular selective H2-agonists. Eur J Med Chem 1988. [DOI: 10.1016/0223-5234(88)90013-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Sterk GJ, Koper J, Van Der Goot H, Timmerman H. Studies on histaminergic compounds VIII. A new series of compounds showing H1-antagonistic and H2-agonistic properties; synthesis, in vitro pharmacology and structure—activity relationships. Eur J Med Chem 1987. [DOI: 10.1016/0223-5234(87)90288-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abstract
The available data indicate that the beta-adrenergic receptors that mediate positive inotropic responses undergo "down-regulation," a cellularly mediated decrease in surface receptor number, in congestive heart failure. This decrease in beta-adrenergic receptor number is proportional to the degree of myocardial dysfunction and the loss of contractility that occurs in congestive heart failure. It appears to be chamber-specific, occurring to the greatest degree in the most severely affected ventricular chamber, and is specific to the beta 1-adrenergic receptor subtype. Beta-adrenergic receptor down-regulation may be the result of the excessively high levels of plasma catecholamines seen in congestive heart failure, inasmuch as a similar phenomenon of beta-adrenergic receptor down-regulation is seen in animals treated with high doses of catecholamines. The specific down-regulation in cardiac beta receptors may be, in part, the cause of the decrease in myocardial function observed during long-term beta-adrenergic receptor stimulation, and an actual decrease in beta-adrenergic receptor number has been observed in myocardial tissue from patients with congestive heart failure. Down-regulation of beta receptors in congestive heart failure results in a decrease or loss of efficacy of beta-adrenergic receptor agonists on long-term administration. This is especially evident for partial agonists, which are more dependent on receptor number for their positive inotropic effects than full agonists. Although beta receptors are down-regulated in congestive heart failure, myocardial alpha 1-adrenergic receptors and histamine H2 receptors do not appear to be subject to this same regulatory process. Inasmuch as stimulation of both of these receptors results in a positive inotropic effect, further study should be given to the potential therapeutic utility of selective stimulation of myocardial alpha 1-adrenergic receptors and histamine H2 receptors in congestive heart failure. It is evident that the status of specific receptor subtypes in pathophysiologic states such as congestive heart failure must be considered when assessing the likelihood of success in treating patients with beta-adrenergic receptor agonists.
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Permanetter B, Baumann G, Dörner J, Schunack W, Blömer H. Effects of three histaminergic compounds on function and oxygen consumption of isolated guinea-pig hearts. AGENTS AND ACTIONS 1985; 16:215-8. [PMID: 3160223 DOI: 10.1007/bf01983143] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
First experiences in man indicate, that even in catecholamine-insensitive congestive cardiomyopathy a considerable improvement of myocardial function can be attained by the H2-receptor agonist impromidine. In an isolated, pressure-volume work performing guinea-pig heart preparation cardiac effects of three histaminergic compounds (Na,5-dimethylhistamine (HC1)2, 5-ethyl-Na-methyl-histamine (HC1)2, Na,Na-dimethyl-histamine (HC1)2) were examined. Influences on function and myocardial oxygen consumption were compared to those obtained by impromidine. Dose-response curves for the histamine derivatives were 1.7-2.5 orders of magnitude right of the impromidine curves. Maximal inotropic stimulation was greater for Na,5-dimethyl-histamine (HC1)2 than for impromidine. All compounds exhibited a high chronotropic effect and, at high concentrations, a net coronary dilating effect.
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