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Scherbaum I, Heidecke H, Bunte K, Peters U, Beikler T, Boege F. Autoantibodies against M 5-muscarinic and beta 1-adrenergic receptors in periodontitis patients. Aging (Albany NY) 2020; 12:16609-16620. [PMID: 32857064 PMCID: PMC7485715 DOI: 10.18632/aging.103864] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Accepted: 07/21/2020] [Indexed: 12/12/2022]
Abstract
Autoantibodies against muscarinic and beta1-adrenergic receptors are considered a potential cause and/or risk factor for chronic heart failure. Association of periodontitis with such autoantibodies and with impaired heart function has been observed in patients exposed to endemic Chagas' disease, which triggers by itself cardiomyopathy and receptor immunization.Here we studied the association between periodontitis, markers of cardiac injury and receptor autoimmunization in periodontitis patients (n = 147) not exposed to Chagas' disease. The autoantibodies were determined by IgG binding to native intact muscarinic and beta1-adrenergic receptors or to a cyclic peptide mimicking the disease-relevant conformational autoepitope presented by the active beta1-adrenergic receptor. Possible cardiac injury and inflammatory status were judged by serum levels of proBNP/Troponin I and CRP/IL-6, respectively. These parameters were analysed in healthy and periodontally diseased individuals as well as before and after periodontal therapy.Patients with periodontitis had significantly (p < 0.001) higher levels of autoantibodies against M5-muscarinic and beta1-adrenergic receptors, which further increased following periodontal therapy. Receptor autoantibodies were associated with increased inflammatory status but not with increased markers of cardiac injury. Thus, our data indicate that periodontitis triggers systemic inflammation, which is associated with receptor autoimmunization, and, independently thereof, with cardiac injury.
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Affiliation(s)
- Isabel Scherbaum
- Central Institute for Clinical Chemistry and Laboratory Diagnostics, Heinrich Heine University Düsseldorf, Medical Faculty, Düsseldorf, Germany
| | | | - Kübra Bunte
- Department of Periodontics, Preventive and Restorative Dentistry, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Ulrike Peters
- Department of Periodontics, Preventive and Restorative Dentistry, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Thomas Beikler
- Department of Periodontics, Preventive and Restorative Dentistry, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Fritz Boege
- Central Institute for Clinical Chemistry and Laboratory Diagnostics, Heinrich Heine University Düsseldorf, Medical Faculty, Düsseldorf, Germany
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2
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Liao Y, Wang Y. Cardiovascular Immunology Research in Wuhan Union Hospital: Over the Past 25 years. CARDIOVASCULAR INNOVATIONS AND APPLICATIONS 2017. [DOI: 10.15212/cvia.2016.0067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Velloso EP, Pimentel RL, Braga JF, Cabral ACV, Reis ZSN, Bader M, Santos RAS, Wallukat G. Identification of a Novel Agonist-Like Autoantibody in Preeclamptic Patients. Am J Hypertens 2016; 29:405-12. [PMID: 26158852 DOI: 10.1093/ajh/hpv099] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Accepted: 06/08/2015] [Indexed: 01/06/2023] Open
Abstract
BACKGROUND Recent studies have shown that preeclampsia (PE) is associated with the presence of autoantibodies (AABs) that activate the angiotensin II AT1 receptor, which could contribute to many of the symptoms of PE. METHODS To investigate the frequency and the targets of AABs in preeclamptic women (31 cases) and healthy pregnant normotensive women (29 cases) in Brazil, antibodies from serum samples were detected by a bioassay using spontaneously beating neonatal rat cardiomyocytes in culture. In the cardiomyocytes, the agonistic AABs induce a positive or negative chronotropic response, mimicking the corresponding receptor agonists. The specificity of the AAB response was identified by specific receptor antagonists. RESULTS Thirty preeclamptic patients (97%) presented AABs against the angiotensin II AT1 receptor. The agonistic effect of the AAB was blocked by irbesartan and neutralized by a peptide corresponding to the second extracellular loop of this receptor. Strikingly, we discovered that all sera from the severe preeclamptic patients (16 cases) contained a novel agonist-like AAB directed against the endothelin-1 ETA receptor in addition to the AABs against the angiotensin II AT1 receptor. This AAB was selectively blocked by the antagonist BQ-123, antagonized by the protein kinase C (PKC) inhibitor Calphostin C and neutralized by peptides corresponding to the second extracellular loop of the endothelin-1 ETA receptor subtype. CONCLUSIONS We described, for the first time, the presence of endothelin-1 ETA receptor AABs in PE. Our results suggest that the presence of both agonistic AABs may be involved in the pathogenesis of severe PE.
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MESH Headings
- Adult
- Angiotensin II Type 1 Receptor Blockers/pharmacology
- Animals
- Autoantibodies/immunology
- Autoantibodies/pharmacology
- Biphenyl Compounds/pharmacology
- Case-Control Studies
- Endothelin Receptor Antagonists/pharmacology
- Enzyme Inhibitors/pharmacology
- Female
- Gestational Age
- Heart Rate/drug effects
- Humans
- Irbesartan
- Myocytes, Cardiac/drug effects
- Naphthalenes/pharmacology
- Peptides, Cyclic/pharmacology
- Pre-Eclampsia/immunology
- Pregnancy
- Pregnancy Trimester, Third
- Protein Kinase C/antagonists & inhibitors
- Protein Kinase C/drug effects
- Protein Kinase C/immunology
- Rats
- Rats, Wistar
- Receptor, Angiotensin, Type 1/drug effects
- Receptor, Angiotensin, Type 1/immunology
- Receptor, Endothelin A/drug effects
- Receptor, Endothelin A/immunology
- Severity of Illness Index
- Tetrazoles/pharmacology
- Young Adult
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Affiliation(s)
- Elizabeth Portugal Velloso
- Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Renata Lúcia Pimentel
- Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Janaína F Braga
- Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Antônio Carlos Vieira Cabral
- Department of Gynecology and Obstetrics, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Zilma Silveira N Reis
- Department of Gynecology and Obstetrics, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Michael Bader
- Max-Delbrück-Center for Molecular Medicine (MDC), Berlin-Buch, Germany
| | - Robson Augusto S Santos
- Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil;
| | - Gerd Wallukat
- Max-Delbrück-Center for Molecular Medicine (MDC), Berlin-Buch, Germany
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Boivin V, Beyersdorf N, Palm D, Nikolaev VO, Schlipp A, Müller J, Schmidt D, Kocoski V, Kerkau T, Hünig T, Ertl G, Lohse MJ, Jahns R. Novel receptor-derived cyclopeptides to treat heart failure caused by anti-β1-adrenoceptor antibodies in a human-analogous rat model. PLoS One 2015; 10:e0117589. [PMID: 25700031 PMCID: PMC4336331 DOI: 10.1371/journal.pone.0117589] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2014] [Accepted: 12/28/2014] [Indexed: 01/14/2023] Open
Abstract
Despite recent therapeutic advances the prognosis of heart failure remains poor. Recent research suggests that heart failure is a heterogeneous syndrome and that many patients have stimulating auto-antibodies directed against the second extracellular loop of the β1 adrenergic receptor (β1EC2). In a human-analogous rat model such antibodies cause myocyte damage and heart failure. Here we used this model to test a novel antibody-directed strategy aiming to prevent and/or treat antibody-induced cardiomyopathy. To generate heart failure, we immunised n = 76/114 rats with a fusion protein containing the human β1EC2 (amino-acids 195-225) every 4 weeks; n = 38/114 rats were control-injected with 0.9% NaCl. Intravenous application of a novel cyclic peptide mimicking β1EC2 (β1EC2-CP, 1.0 mg/kg every 4 weeks) or administration of the β1-blocker bisoprolol (15 mg/kg/day orally) was initiated either 6 weeks (cardiac function still normal, prevention-study, n = 24 (16 treated vs. 8 untreated)) or 8.5 months after the 1st immunisation (onset of cardiomyopathy, therapy-study, n = 52 (40 treated vs. 12 untreated)); n = 8/52 rats from the therapy-study received β1EC2-CP/bisoprolol co-treatment. We found that β1EC2-CP prevented and (alone or as add-on drug) treated antibody-induced cardiac damage in the rat, and that its efficacy was superior to mono-treatment with bisoprolol, a standard drug in heart failure. While bisoprolol mono-therapy was able to stop disease-progression, β1EC2-CP mono-therapy -or as an add-on to bisoprolol- almost fully reversed antibody-induced cardiac damage. The cyclo¬peptide acted both by scavenging free anti-β1EC2-antibodies and by targeting β1EC2-specific memory B-cells involved in antibody-production. Our model provides the basis for the clinical translation of a novel double-acting therapeutic strategy that scavenges harmful anti-β1EC2-antibodies and also selectively depletes memory B-cells involved in the production of such antibodies. Treatment with immuno-modulating cyclopeptides alone or as an add-on to β1-blockade represents a promising new therapeutic option in immune-mediated heart failure.
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Affiliation(s)
- Valérie Boivin
- Institute of Pharmacology and Toxicology, University of Würzburg, Würzburg, Germany
- Rudolf-Virchow-Center/DFG-Research-Center for Experimental Biomedicine, University of Würzburg, Würzburg, Germany
- Comprehensive Heart Failure Centre (CHFC), University Hospital of Würzburg, Würzburg, Germany
| | - Niklas Beyersdorf
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg, Germany
| | - Dieter Palm
- Rudolf-Virchow-Center/DFG-Research-Center for Experimental Biomedicine, University of Würzburg, Würzburg, Germany
| | | | - Angela Schlipp
- Institute of Pharmacology and Toxicology, University of Würzburg, Würzburg, Germany
- Rudolf-Virchow-Center/DFG-Research-Center for Experimental Biomedicine, University of Würzburg, Würzburg, Germany
- Lehrstuhl Anatomie I, University of München (LMU), München, Germany
| | - Justus Müller
- Institute of Pathology, University of Würzburg, Würzburg, Germany
| | - Doris Schmidt
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg, Germany
| | - Vladimir Kocoski
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg, Germany
| | - Thomas Kerkau
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg, Germany
| | - Thomas Hünig
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg, Germany
| | - Georg Ertl
- Comprehensive Heart Failure Centre (CHFC), University Hospital of Würzburg, Würzburg, Germany
| | - Martin J. Lohse
- Institute of Pharmacology and Toxicology, University of Würzburg, Würzburg, Germany
- Rudolf-Virchow-Center/DFG-Research-Center for Experimental Biomedicine, University of Würzburg, Würzburg, Germany
- Comprehensive Heart Failure Centre (CHFC), University Hospital of Würzburg, Würzburg, Germany
| | - Roland Jahns
- Institute of Pharmacology and Toxicology, University of Würzburg, Würzburg, Germany
- Rudolf-Virchow-Center/DFG-Research-Center for Experimental Biomedicine, University of Würzburg, Würzburg, Germany
- Comprehensive Heart Failure Centre (CHFC), University Hospital of Würzburg, Würzburg, Germany
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5
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The inhibitory effects of antimuscarinic autoantibodies in the sera of primary Sjogren syndrome patients on the gastrointestinal motility. Mol Immunol 2013; 56:583-7. [DOI: 10.1016/j.molimm.2013.06.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Revised: 05/25/2013] [Accepted: 06/07/2013] [Indexed: 11/19/2022]
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6
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Li H, Zuccolo J, Kem DC, Zillner C, Lee J, Smith K, James JA, Cunningham MW, Yu X. Implications of a vasodilatory human monoclonal autoantibody in postural hypotension. J Biol Chem 2013; 288:30734-30741. [PMID: 24043632 DOI: 10.1074/jbc.m113.477869] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Functional autoantibodies to the autonomic receptors are increasingly recognized in the pathophysiology of cardiovascular diseases. To date, no human activating monoclonal autoantibodies to these receptors have been available. In this study, we describe for the first time a β2-adrenergic receptor (β2AR)-activating monoclonal autoantibody (C5F2) produced from the lymphocytes of a patient with idiopathic postural hypotension. C5F2, an IgG3 isotype, recognizes an epitope in the N terminus of the second extracellular loop (ECL2) of β2AR. Surface plasmon resonance analysis revealed high binding affinity for the β2AR ECL2 peptide. Immunoblotting and immunofluorescence demonstrated specific binding to β2AR in H9c2 cardiomyocytes, CHO cells expressing human β2AR, and rat aorta. C5F2 stimulated cyclic AMP production in β2AR-transfected CHO cells and induced potent dilation of isolated rat cremaster arterioles, both of which were specifically blocked by the β2AR-selective antagonist ICI-118551 and by the β2AR ECL2 peptide. This monoclonal antibody demonstrated sufficient activity to produce postural hypotension in its host. Its availability provides a unique opportunity to identify previously unrecognized causes and new pharmacological management of postural hypotension and other cardiovascular diseases.
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Affiliation(s)
- Hongliang Li
- From the Departments of Medicine and; the Oklahoma City Veterans Affairs Medical Center, and
| | - Jonathan Zuccolo
- Microbiology and Immunology, University of Oklahoma Health Sciences Center
| | - David C Kem
- From the Departments of Medicine and; the Oklahoma City Veterans Affairs Medical Center, and
| | - Caitlin Zillner
- From the Departments of Medicine and; the Oklahoma City Veterans Affairs Medical Center, and
| | | | - Kenneth Smith
- the Arthritis and Clinical Immunology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, Oklahoma 73104
| | - Judith A James
- From the Departments of Medicine and; Microbiology and Immunology, University of Oklahoma Health Sciences Center,; the Arthritis and Clinical Immunology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, Oklahoma 73104
| | | | - Xichun Yu
- From the Departments of Medicine and; the Oklahoma City Veterans Affairs Medical Center, and.
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7
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Herda LR, Felix SB, Boege F. Drug-like actions of autoantibodies against receptors of the autonomous nervous system and their impact on human heart function. Br J Pharmacol 2012; 166:847-57. [PMID: 22220626 PMCID: PMC3412294 DOI: 10.1111/j.1476-5381.2012.01828.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Antibodies against cholinergic and adrenergic receptors (adrenoceptors) are frequent in serum of patients with chronic heart failure. Their prevalence is associated with Chagas' disease, idiopathic dilated cardiomyopathy (DCM), and ischaemic heart disease. Among the epitopes targeted are first and second extracellular loops of the β-adrenergic (β-adrenoceptor) and M2 muscarinic receptor. β1-adrenoceptor autoantibodies affect radioligand binding and cardiomyocyte function similar to agonists. Corresponding rodent immunizations induce symptoms compatible with chronic heart failure that are reversible upon removal of the antibodies, transferable via the serum and abrogated by adrenergic antagonists. In DCM patients, prevalence and stimulatory efficacy of β1-adrenoceptor autoantibodies are correlated to the decline in cardiac function, ventricular arrhythmia and higher incidence of cardiac death. In conclusion, such autoantibodies seem to cause or promote chronic human left ventricular dysfunction by acting on their receptor targets in a drug-like fashion. However, the pharmacology of this interaction is poorly understood. It is unclear how the autoantibodies trigger changes in receptor activity and second messenger coupling and how that is related to the pathogenesis and severity of the associated diseases. Here, we summarize the available evidence regarding these issues and discuss these findings in the light of recent knowledge about the conformational activation of the human β2-adrenoceptor and the properties of bona fide cardiopathogenic autoantibodies derived from immune-adsorption therapy of DCM patients. These considerations might contribute to the conception of therapy regimen aimed at counteracting or neutralizing cardiopathogenic receptor autoantibodies.
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Affiliation(s)
- L R Herda
- Department of Internal Medicine B, University of Greifswald, Greifswald, Germany
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8
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Dandel M, Wallukat G, Potapov E, Hetzer R. Role of β1-adrenoceptor autoantibodies in the pathogenesis of dilated cardiomyopathy. Immunobiology 2012; 217:511-20. [DOI: 10.1016/j.imbio.2011.07.012] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2011] [Accepted: 07/05/2011] [Indexed: 10/18/2022]
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9
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Jahns R, Boivin V, Schwarzbach V, Ertl G, Lohse MJ. Pathological autoantibodies in cardiomyopathy. Autoimmunity 2009; 41:454-61. [DOI: 10.1080/08916930802031603] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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10
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By Y, Durand-Gorde JM, Condo J, Lejeune PJ, Mallet B, Carayon P, Guieu R, Ruf J. Production of an agonist-like monoclonal antibody to the human A2A receptor of adenosine for clinical use. Mol Immunol 2008; 46:400-5. [PMID: 19041138 DOI: 10.1016/j.molimm.2008.10.017] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2008] [Revised: 10/13/2008] [Accepted: 10/14/2008] [Indexed: 10/21/2022]
Abstract
The second extracellular loop of the A(2A) receptor (A(2A)R) of adenosine was used to immunize mice for production of Adonis, an IgM monoclonal antibody. Adonis bound to the immunogen peptide and the native receptor in ELISA with K(D) values in 6.51-12.35 nM range. It recognized a linear epitope of 7 amino acids (LFEDVVP) at the C-terminal part of the external loop. Adonis revealed a 45-kDa band in lysate of human peripheral blood mononuclear cells in Western blotting in denaturing conditions. This served to monitor the up-regulation of the A(2A)R expression by caffeine. Adonis stimulated the cAMP production and inhibited the cell proliferation of an A(2A)R transfected stable cell line. These results confirm the immunogenicity and the functional relevance of the second extracellular loop of the A(2A)R. They suggest that Adonis may be of clinical use in various pathological situations to measure the regulation of the A(2A)R expression and to act as A(2A)R agonist drug.
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Affiliation(s)
- Youlet By
- Laboratoire de Biochimie Endocrinienne et Métabolique (EA3288), Université de la Méditerranée, Faculté de Médecine Timone, Marseille, France
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11
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Liu J, Mao W, Iwai C, Fukuoka S, Vulapalli R, Huang H, Wang T, Sharma VK, Sheu SS, Fu M, Liang CS. Adoptive passive transfer of rabbit beta1-adrenoceptor peptide immune cardiomyopathy into the Rag2-/- mouse: participation of the ER stress. J Mol Cell Cardiol 2007; 44:304-14. [PMID: 18155231 DOI: 10.1016/j.yjmcc.2007.11.007] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2007] [Revised: 10/02/2007] [Accepted: 11/13/2007] [Indexed: 01/07/2023]
Abstract
Auto-antibodies against the beta(1)-adrenoceptors are present in 30-40% of patients with dilated cardiomyopathy. Recently, a synthetic peptide corresponding to a sequence of the second extracellular loop of the human beta(1)-adrenoceptor (beta(1)-EC(II)) has been shown to produce endoplasmic reticulum (ER) stress, myocyte apoptosis and cardiomyopathy in immunized rabbits. To study the direct cardiac effects of anti-beta(1)-EC(II) antibody in intact animals and if they are mediated via beta(1)-adrenoceptor stimulation, we administered IgG purified from beta(1)-EC(II)-immunized rabbits to recombination activating gene 2 knock-out (Rag2(-/-)) mice every 2 weeks with and without metoprolol treatment. Serial echocardiography and cardiac catheterization showed that beta(1)-EC(II) IgG reduced cardiac systolic function after 3 months. This was associated with increase in heart weight, myocyte apoptosis, activation of caspase-3, -9 and -12, and increased ER stress as evidenced by upregulation of GRP78 and CHOP and cleavage of ATF6. The Rag2(-/-) mice also exhibited increased phosphorylation of CaMKII and p38 MAPK. Metoprolol administration, which attenuated the phosphorylation of CaMKII and p38 MAPK, reduced the ER stress, caspase activation and cell death. Finally, we employed the small-interfering RNA technology to reduce caspase-12 in cultured rat cardiomyocytes. This reduced not only the increase of cleaved caspase-12 but also of the number of myocyte apoptosis produced by beta(1)-EC(II) IgG. Thus, we conclude that ER stress plays an important role in cell death and cardiac dysfunction in beta(1)-EC(II) IgG cardiomyopathy, and the effects of beta(1)-EC(II) IgG are mediated via the beta(1)-adrenergic receptor.
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Affiliation(s)
- Jiahao Liu
- Cardiology Division, Department of Medicine, University of Rochester Medical Center, Rochester, New York 14642, USA
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12
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Jahns R, Boivin V, Lohse MJ. Beta 1-adrenergic receptor-directed autoimmunity as a cause of dilated cardiomyopathy in rats. Int J Cardiol 2006; 112:7-14. [PMID: 16872696 DOI: 10.1016/j.ijcard.2006.05.008] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2006] [Accepted: 05/10/2006] [Indexed: 11/25/2022]
Abstract
Progressive cardiac dilatation and pump failure of unknown etiology has been termed idiopathic dilated cardiomyopathy (DCM). During recent years a large body of data has accumulated indicating that functionally active antibodies or autoantibodies being able to recognize and to stimulate the cardiac beta(1)-adrenergic receptor (anti-beta(1)-AR) may play an important role in the initiation and/or clinical course of DCM. Recent experiments in rats even point towards a cause-and-effect relation between stimulatory anti-beta(1)-AR antibodies and DCM. Immunization of rats against the second extracellular loop of the human beta(1)-adrenergic receptor (100% sequence-identity between human and rat) resulted in both development of stimulatory anti-beta(1)-AR antibodies and development of progressive cardiac dilatation and dysfunction. Isogenic transfer of stimulatory anti-beta(1)-AR from cardiomyopathic into healthy inbred animals reproduced the disease, hence providing conclusive proof for a beta(1)-receptor-directed autoimmune attack as a possible cause of cardiomyopathy. This kind of cardiomyopathy is now referred to as anti-beta(1)-AR-induced dilated immune-cardiomyopathy (DiCM). The following article reviews recent evidence obtained from experimental animal-models implying a significant role of the cardiac beta(1)-adrenergic receptor as a pathophysiologically and clinically relevant autoantigen also in human DCM.
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Affiliation(s)
- Roland Jahns
- Department of Internal Medicine, Medizinische Klinik und Poliklinik I, University of Wuerzburg, Josef-Schneider-Strasse 2, D-97080 Wuerzburg, Germany.
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Wang ZH, Liao YH, Fu M. The frequency of occurrence of autoantibodies against beta1-adrenoceptors and its clinical relevance in patients with hepatitis virus myocarditis. Autoimmunity 2002; 34:241-5. [PMID: 11905850 DOI: 10.3109/08916930109014693] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The aim of this study was to examine the frequency of occurrence of autoantibodies against beta1-adrenoceptors in patients with hepatitis virus myocarditis (HVM) and its possible correlation with clinical characteristics. A total of 103 patients with viral myocarditis were divided into a positive group (HVM group, n=29) and a negative group (Non-HVM group, n=74) according to the laboratory findings regarding their type of hepatitis virus. The study parameters included UCG, ECG, biochemical findings and screening of autoantibodies against beta1-adrenoceptor. It was shown that the positive rate of the hepatitis virus was 28.16% (29/103) in patients with viral myocarditis. The severity of myocardial or liver injuries and the frequency of occurrence of autoantibodies against beta1-adrenoceptors in patients with viral myocarditis were more pronounced, before treatment, in the HVM group than in the Non-HVM group. The positive rates of the antibodies against the hepatitis virus and the autoantibodies against beta1-adrenoceptors were highly consistent in patients with HVM (p<0.05). In conclusion, the frequency of occurrence of the autoantibodies against beta1-adrenoceptors may be one important marker of HVM and, thus, possibly involved in the pathogenesis of the HVM.
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Affiliation(s)
- Z H Wang
- Laboratory of Cardiovascular Immunology, Institute of Cardiology, Union Hospital, Tongji Medical University, Wuhan, China
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14
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Luo Y, Liao Y, Wang M, Wei Y, Dong J, Wang I, Lu Y. Experimental study on AT1-receptor-peptide-induced myocardial immune damage in rat. Curr Med Sci 2001; 21:198-201. [PMID: 12539575 DOI: 10.1007/bf02886428] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2001] [Indexed: 11/25/2022]
Abstract
In order to investigate the immunological damage in rat immunized with AT1-receptor peptide, 18 male Wistar rats were divided into two groups: immunized-group (n = 12), each rat was immunized with 150 micrograms AT1-receptor peptide coupled to bovine serum albumin, together with Freund's adjuvant. Control group (n = 6), sham-immunized, "immunized liquid" was same as immunized-group except AT1-receptor peptide. Systolic blood pressure (SBP) was measured by using the tail-cuff technique, antibody against AT1-receptor peptide detected by using ELISA method, and left ventricular myocardium and renal cortex sections were observed under light and electron microscopy. There was no significant difference in SBP and light microscopic observation of the tissue sections between the immunized-group and control group. The O.D. value of anti-AT1-receptor peptide antiserum was significantly higher in the immunized-group than in the rats before immunization and control group (P < 0.01). Positive rate in the immunized-group was 100%, while 0% in the control group. Ultramicroscopic morphology showed potential myocardial injury, including: increase in number of mitochondria, swelling of many mitochondria with reduction in number or absence of their cristae and cristolysis, disorder of the cardiac myofibrils, and myofibrillar disruption and myocytolysis. And lysosomes were increased in renal tubular epithelia. The AT1-receptor peptide could induce to generate the antibody against AT1-receptor peptide and lead to myocardial and renal damage in rats.
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Affiliation(s)
- Y Luo
- Department of Cardiology, Xiehe Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022
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15
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Choe YH, Han BK, Koh EM, Kim DK, Do YS, Lee WR. Takayasu's arteritis: assessment of disease activity with contrast-enhanced MR imaging. AJR Am J Roentgenol 2000; 175:505-11. [PMID: 10915704 DOI: 10.2214/ajr.175.2.1750505] [Citation(s) in RCA: 145] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
OBJECTIVE The purpose of this study was to evaluate the role of contrast-enhanced MR imaging in the determination of disease activity in patients with Takayasu's arteritis. SUBJECTS AND METHODS High-resolution contrast-enhanced T1-weighted spinecho MR imaging using small fields of view (14-20 cm) and thin slices (4-5 mm) was performed in 26 patients with Takayasu's arteritis and 16 healthy subjects. The degree of aortic mural enhancement was assessed by measuring signal intensity and by visually estimating it in comparison with that of the myocardium. RESULTS Contrast-enhanced MR imaging showed more enhancement of thickened aortic wall compared with myocardium, thus suggesting active Takayasu's arteritis on MR imaging in 16 patients. Determination of disease activity using contrast-enhanced MR imaging was concordant with clinical findings in 23 patients (88.5%). Contrast-enhanced MR findings were concordant with laboratory findings in most patients (erythrocyte sedimentation rate in 92.3% [24/26] and C-reactive protein in 84.6% [22/26]). The measured signal intensity of the aortic wall relative to that of myocardium during the early phase of contrast-enhanced MR imaging correlated well with the erythrocyte sedimentation rate (r = 0.78, p < 0.005) and with the C-reactive protein level (r = 0.63, p < 0.005). CONCLUSION Contrast-enhanced MR imaging provides information about disease activity of Takayasu's arteritis, which may be useful in the diagnosis and treatment of Takayasu's arteritis.
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Affiliation(s)
- Y H Choe
- Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
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Leurs R, Rodriguez Pena MS, Bakker RA, Alewijnse AE, Timmerman H. Constitutive activity of G protein coupled receptors and drug action. PHARMACEUTICA ACTA HELVETIAE 2000; 74:327-31. [PMID: 10812977 DOI: 10.1016/s0031-6865(99)00042-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- R Leurs
- Division of Medicinal Chemistry, Leiden/Amsterdam Center for Drug Research, Vrije Universiteit, Netherlands.
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