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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: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [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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Guimaraes PS, Oliveira MF, Braga JF, Nadu AP, Schreihofer A, Santos RA, Campagnole-Santos MJ. Increasing Angiotensin-(1–7) Levels in the Brain Attenuates Metabolic Syndrome–Related Risks in Fructose-Fed Rats. Hypertension 2014; 63:1078-85. [DOI: 10.1161/hypertensionaha.113.01847] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We evaluated effects of chronic intracerebroventricular infusion of angiotensin (Ang)-(1–7) on cardiovascular and metabolic parameters in fructose-fed (FF) rats. After 6 weeks of fructose intake (10% in drinking water), Sprague-Dawley rats were subjected to intracerebroventricular infusion of Ang-(1–7) (200 ng/h; FF+A7 group) or 0.9% sterile saline (FF group) for 4 weeks with continued access to fructose. Compared with control rats, FF rats had increased mean arterial pressure and cardiac sympathetic tone with impaired baroreflex sensitivity. FF rats also presented increased circulating triglycerides, leptin, insulin, and glucose with impaired glucose tolerance. Furthermore, relative weights of liver and retroperitoneal adipose tissue were increased in FF rats. Glycogen content was reduced in liver, but increased in muscle. In contrast, fructose-fed rats subjected to chronic intracerebroventricular infusion of Ang-(1–7) presented reduced cardiac sympathetic tone with normalized mean arterial pressure, baroreflex sensitivity, glucose and insulin levels, and improved glucose tolerance. Relative weight of liver, and hepatic and muscle glycogen contents were also normalized in FF+A7 rats. In addition, FF+A7 rats had reduced mRNA expression for neuronal nitric oxide synthase and NR1 subunit of
N
-methyl-
d
-aspartate receptor in hypothalamus and dorsomedial medulla. Ang-(1–7) infusion did not alter fructose-induced hyperleptinemia and increased relative weight of retroperitoneal adipose tissue. There were no differences in body weights, neither in liver mRNA expression of phosphoenolpyruvate carboxykinase or glucose-6-phosphatase among the groups. These data indicate that chronic increase in Ang-(1–7) levels in the brain may have a beneficial role in fructose-fed rats by ameliorating cardiovascular and metabolic disorders.
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Affiliation(s)
- Priscila S. Guimaraes
- From the Department of Physiology and Biophysics, Biological Science Institute, National Institute of Science and Technology-Nanobiofar, Federal University of Minas Gerais, Belo Horizonte, Brazil (P.S.G., M.F.O., J.F.B., A.P.N., R.A.S.S., M.J.C.-S.); and Department of Integrative Physiology, University of North Texas Health Science Center, Fort Worth, TX (A.S.)
| | - Mariana F. Oliveira
- From the Department of Physiology and Biophysics, Biological Science Institute, National Institute of Science and Technology-Nanobiofar, Federal University of Minas Gerais, Belo Horizonte, Brazil (P.S.G., M.F.O., J.F.B., A.P.N., R.A.S.S., M.J.C.-S.); and Department of Integrative Physiology, University of North Texas Health Science Center, Fort Worth, TX (A.S.)
| | - Janaína F. Braga
- From the Department of Physiology and Biophysics, Biological Science Institute, National Institute of Science and Technology-Nanobiofar, Federal University of Minas Gerais, Belo Horizonte, Brazil (P.S.G., M.F.O., J.F.B., A.P.N., R.A.S.S., M.J.C.-S.); and Department of Integrative Physiology, University of North Texas Health Science Center, Fort Worth, TX (A.S.)
| | - Ana Paula Nadu
- From the Department of Physiology and Biophysics, Biological Science Institute, National Institute of Science and Technology-Nanobiofar, Federal University of Minas Gerais, Belo Horizonte, Brazil (P.S.G., M.F.O., J.F.B., A.P.N., R.A.S.S., M.J.C.-S.); and Department of Integrative Physiology, University of North Texas Health Science Center, Fort Worth, TX (A.S.)
| | - Ann Schreihofer
- From the Department of Physiology and Biophysics, Biological Science Institute, National Institute of Science and Technology-Nanobiofar, Federal University of Minas Gerais, Belo Horizonte, Brazil (P.S.G., M.F.O., J.F.B., A.P.N., R.A.S.S., M.J.C.-S.); and Department of Integrative Physiology, University of North Texas Health Science Center, Fort Worth, TX (A.S.)
| | - Robson A.S. Santos
- From the Department of Physiology and Biophysics, Biological Science Institute, National Institute of Science and Technology-Nanobiofar, Federal University of Minas Gerais, Belo Horizonte, Brazil (P.S.G., M.F.O., J.F.B., A.P.N., R.A.S.S., M.J.C.-S.); and Department of Integrative Physiology, University of North Texas Health Science Center, Fort Worth, TX (A.S.)
| | - Maria Jose Campagnole-Santos
- From the Department of Physiology and Biophysics, Biological Science Institute, National Institute of Science and Technology-Nanobiofar, Federal University of Minas Gerais, Belo Horizonte, Brazil (P.S.G., M.F.O., J.F.B., A.P.N., R.A.S.S., M.J.C.-S.); and Department of Integrative Physiology, University of North Texas Health Science Center, Fort Worth, TX (A.S.)
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