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Dalmasso C, Ahmed NS, Ghuneim S, Cincinelli C, Leachman JR, Giani JF, Cassis L, Loria AS. Obese Male Mice Exposed to Early Life Stress Display Sympathetic Activation and Hypertension Independent of Circulating Angiotensin II. J Am Heart Assoc 2024; 13:e029511. [PMID: 38156515 PMCID: PMC10863837 DOI: 10.1161/jaha.123.029511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Accepted: 11/03/2023] [Indexed: 12/30/2023]
Abstract
BACKGROUND We have previously reported that male mice exposed to maternal separation and early weaning (MSEW), a model of early life stress, show sympathetic activation and increased blood pressure in response to a chronic high-fat diet. The goal of this study was to investigate the contribution of the renin-angiotensin-aldosterone system to the mechanism by which MSEW increases blood pressure and vasomotor sympathetic tone in obese male mice. METHODS AND RESULTS Mice were exposed to MSEW during postnatal life. Undisturbed litters served as controls. At weaning, both control and MSEW offspring were placed on a low-fat diet or a high-fat diet for 20 weeks. Angiotensin peptides in serum were similar in control and MSEW mice regardless of the diet. However, a high-fat diet induced a similar increase in angiotensinogen levels in serum, renal cortex, liver, and fat in both control and MSEW mice. No evidence of renin-angiotensin system activation was found in adipose tissue and renal cortex. After chronic treatment with enalapril (2.5 mg/kg per day, drinking water, 7 days), an angiotensin-converting enzyme inhibitor that does not cross the blood-brain barrier, induced a similar reduction in blood pressure in both groups, while the vasomotor sympathetic tone remained increased in obese MSEW mice. In addition, acute boluses of angiotensin II (1, 10, 50 μg/kg s.c.) exerted a similar pressor response in MSEW and control mice before and after enalapril treatment. CONCLUSIONS Overall, elevated blood pressure and vasomotor sympathetic tone remained exacerbated in MSEW mice compared with controls after the peripheral inhibition of angiotensin-converting enzyme, suggesting a mechanism independent of angiotensin II.
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Affiliation(s)
- Carolina Dalmasso
- Department of Pharmacology and Nutritional SciencesUniversity of KentuckyLexingtonKYUSA
| | - Nermin S. Ahmed
- Department of Pharmacology and Nutritional SciencesUniversity of KentuckyLexingtonKYUSA
| | - Sundus Ghuneim
- Department of Pharmacology and Nutritional SciencesUniversity of KentuckyLexingtonKYUSA
| | - Cole Cincinelli
- Department of Pharmacology and Nutritional SciencesUniversity of KentuckyLexingtonKYUSA
| | - Jaqueline R. Leachman
- Department of Pharmacology and Nutritional SciencesUniversity of KentuckyLexingtonKYUSA
| | - Jorge F. Giani
- Department of Biomedical SciencesCedars‐Sinai Medical CenterLos AngelesCAUSA
| | - Lisa Cassis
- Department of Pharmacology and Nutritional SciencesUniversity of KentuckyLexingtonKYUSA
| | - Analia S. Loria
- Department of Pharmacology and Nutritional SciencesUniversity of KentuckyLexingtonKYUSA
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A New Perspective on the Renin-Angiotensin System. Diagnostics (Basel) 2022; 13:diagnostics13010016. [PMID: 36611307 PMCID: PMC9818283 DOI: 10.3390/diagnostics13010016] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Accepted: 12/19/2022] [Indexed: 12/24/2022] Open
Abstract
Cardiovascular disease (CVD) is the leading cause of death in the world. Hypertension is a serious medical problem not only in adults but also in children and adolescents. The renin-angiotensin-aldosterone system (RAAS) is one of the most important mechanisms regulating blood pressure and the balance of water and electrolytes. According to the latest reports, RAAS acts not only on endocrine but also on paracrine, autocrine, and intracrine. Moreover, RAAS has a component associated with hypotension and cardioprotective effects. These components are called alternative pathways of RAAS. The most important peptide of the alternative pathway is Ang 1-7, which is related to the Mas receptor. Mas receptors have widely known antihypertension properties, including vasodilatation, the release of nitric oxide, and increased production of anti-inflammatory cytokines. Another interesting peptide is angiotensin A, which combines the properties of the classical and alternative pathways. No less important components of RAAS are the proteolytic enzymes angiotensin convertase enzyme type 1 and 2. They are responsible for the functioning of the RAAS system and are a hypertension therapeutic target. Also involved are tissue-specific enzymes that form a local renin-angiotensin system. Currently, a combination of drugs is used in hypertension treatment. These drugs have many undesirable side effects that cannot always be avoided. For this reason, new treatments are being sought, and the greatest hope comes from the ACE2/ang 1-7/MasR axis.
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O'Connor AT, Haspula D, Alanazi AZ, Clark MA. Roles of Angiotensin III in the brain and periphery. Peptides 2022; 153:170802. [PMID: 35489649 DOI: 10.1016/j.peptides.2022.170802] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Revised: 04/21/2022] [Accepted: 04/25/2022] [Indexed: 10/18/2022]
Abstract
Angiotensin (Ang) III, a biologically active peptide of the renin angiotensin system (RAS) is predominantly known for its central effects on blood pressure. Our understanding of the RAS has evolved from the simplified, classical RAS, a hormonal system regulating blood pressure to a complex system affecting numerous biological processes. Ang II, the main RAS peptide has been widely studied, and its deleterious effects when overexpressed is well-documented. However, other components of the RAS such as Ang III are not well studied. This review examines the molecular and biological actions of Ang III and provides insight into Ang III's potential role in metabolic diseases.
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Affiliation(s)
- Ann Tenneil O'Connor
- Department of Pharmaceutical Sciences, College of Pharmacy, Nova Southeastern University, Fort Lauderdale, FL, USA
| | - Dhanush Haspula
- Molecular Signaling Section, Laboratory of Bioorganic Chemistry, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD NIH-20892, USA
| | - Ahmed Z Alanazi
- Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia
| | - Michelle A Clark
- Department of Pharmaceutical Sciences, College of Pharmacy, Nova Southeastern University, Fort Lauderdale, FL, USA.
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Chen L, Meng Z, Tian L, Zhang Y, Zhao L, Du X, Ma M, Zhang H, Chen J, Meng Q. Complexation of specific residues by carboxylatopillar[6]arene for improving the zymolytic stability of arginine-containing peptides. Org Biomol Chem 2022; 20:2222-2226. [PMID: 35234795 DOI: 10.1039/d2ob00017b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/25/2024]
Abstract
A general strategy for improving the zymolytic stability against proteases is reported. Carboxylatopillar[6]arene (CP6A) could effectively bind arginine and arginine-containing peptides, thereby improving the stability of angiotensin peptides in the presence of trypsin by the complexation of the side chain of the arginine residue.
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Affiliation(s)
- Longming Chen
- State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, Beijing 100850, PR China.
| | - Zhao Meng
- State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, Beijing 100850, PR China.
| | - Long Tian
- State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, Beijing 100850, PR China.
| | - Yahan Zhang
- State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, Beijing 100850, PR China.
| | - Liang Zhao
- State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, Beijing 100850, PR China.
| | - Xinbei Du
- State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, Beijing 100850, PR China.
| | - Mengke Ma
- State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, Beijing 100850, PR China.
| | - Han Zhang
- State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, Beijing 100850, PR China.
| | - Junyi Chen
- State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, Beijing 100850, PR China.
- Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry, Ministry of Education, Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry, Tianjin Normal University, Tianjin 300387, PR China.
| | - Qingbin Meng
- State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, Beijing 100850, PR China.
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Recent Advances in the Endogenous Brain Renin-Angiotensin System and Drugs Acting on It. J Renin Angiotensin Aldosterone Syst 2021; 2021:9293553. [PMID: 34925551 PMCID: PMC8651430 DOI: 10.1155/2021/9293553] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 10/14/2021] [Accepted: 10/23/2021] [Indexed: 12/22/2022] Open
Abstract
The RAS (renin-angiotensin system) is the part of the endocrine system that plays a prime role in the control of essential hypertension. Since the discovery of brain RAS in the seventies, continuous efforts have been put by the scientific committee to explore it more. The brain has shown the presence of various components of brain RAS such as angiotensinogen (AGT), converting enzymes, angiotensin (Ang), and specific receptors (ATR). AGT acts as the precursor molecule for Ang peptides—I, II, III, and IV—while the enzymes such as prorenin, ACE, and aminopeptidases A and N synthesize it. AT1, AT2, AT4, and mitochondrial assembly receptor (MasR) are found to be plentiful in the brain. The brain RAS system exhibits pleiotropic properties such as neuroprotection and cognition along with regulation of blood pressure, CVS homeostasis, thirst and salt appetite, stress, depression, alcohol addiction, and pain modulation. The molecules acting through RAS predominantly ARBs and ACEI are found to be effective in various ongoing and completed clinical trials related to cognition, memory, Alzheimer's disease (AD), and pain. The review summarizes the recent advances in the brain RAS system highlighting its significance in pathophysiology and treatment of the central nervous system-related disorders.
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Kang M, Kang E, Ryu H, Hong Y, Han SS, Park SK, Hyun YY, Sung SA, Kim SW, Yoo TH, Kim J, Ahn C, Oh KH. Measured sodium excretion is associated with CKD progression: results from the KNOW-CKD study. Nephrol Dial Transplant 2021; 36:512-519. [PMID: 32582942 DOI: 10.1093/ndt/gfaa107] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 04/07/2020] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Diet is a modifiable factor of chronic kidney disease (CKD) progression. However, the effect of dietary salt intake on CKD progression remains unclear. Therefore, we analyzed the effect of dietary salt intake on renal outcome in Korean patients with CKD. METHODS We measured 24-h urinary sodium (Na) excretion as a marker of dietary salt intake in the prospective, multi-center, longitudinal KoreaN cohort study for Outcome in patients With CKD (KNOW-CKD). Data were analyzed from CKD patients at Stages G3a to G5 (n = 1254). We investigated the association between dietary salt intake and CKD progression. Patients were divided into four quartiles of dietary salt intake, which was assessed using measured 24-h urinary Na excretion. The study endpoint was composite renal outcome, which was defined as either halving the estimated glomerular filtration rate or developing end-stage renal disease. RESULTS During a median (interquartile range) follow-up of 4.3 (2.8-5.8) years, 480 (38.7%) patients developed the composite renal event. Compared with the reference group (Q2, urinary Na excretion: 104.2 ≤ Na excretion < 145.1 mEq/day), the highest quartile of measured 24-h urinary Na excretion was associated with risk of composite renal outcome [Q4, urinary Na excretion ≥192.9 mEq/day, hazard ratio 1.8 (95% confidence interval 1.12-2.88); P = 0.015] in a multivariable hazards model. Subgroup analyses showed that high-salt intake was particularly associated with a higher risk of composite renal outcome in women, in patients <60 years of age, in those with uncontrolled hypertension and in those with obesity. CONCLUSIONS High salt intake was associated with increased risk of progression in CKD.
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Affiliation(s)
- Minjung Kang
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Republic of Korea
| | - Eunjeong Kang
- Department of Internal Medicine, Ewha Womans University College of Medicine, Ewha Womans University Seoul Hospital, Seoul, Republic of Korea
| | - Hyunjin Ryu
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Republic of Korea
| | - Yeji Hong
- Rehabilitation Medical Research Center, Korea workers' Compensation and Welfare Service Incheon Hospital, Republic of Korea
| | - Seung Seok Han
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Republic of Korea
| | - Sue K Park
- Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Young Youl Hyun
- Department of Internal Medicine, Sungkyunkwan University School of Medicine, Kangbuk Samsung Hospital, Seoul, Republic of Korea
| | - Su Ah Sung
- Department of Internal Medicine, Nowon Eulji Medical Center, Eulji University, Seoul, Republic of Korea
| | - Soo Wan Kim
- Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Tae-Hyun Yoo
- Department of Internal Medicine, College of Medicine, Institute of Kidney Disease Research, Yonsei University, Seoul, Republic of Korea
| | - Jayoun Kim
- Medical Research Collaborating Center, Seoul National University Hospital and Seoul National University College of Medicine, Seoul, Korea
| | - Curie Ahn
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Republic of Korea
| | - Kook-Hwan Oh
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Republic of Korea
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Kehoe PG. The Coming of Age of the Angiotensin Hypothesis in Alzheimer's Disease: Progress Toward Disease Prevention and Treatment? J Alzheimers Dis 2019; 62:1443-1466. [PMID: 29562545 PMCID: PMC5870007 DOI: 10.3233/jad-171119] [Citation(s) in RCA: 93] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
There is wide recognition of a complex association between midlife hypertension and cardiovascular disease and later development of Alzheimer’s disease (AD) and cognitive impairment. While significant progress has been made in reducing rates of mortality and morbidity due to cardiovascular disease over the last thirty years, progress towards effective treatments for AD has been slower. Despite the known association between hypertension and dementia, research into each disease has largely been undertaken in parallel and independently. Yet over the last decade and a half, the emergence of converging findings from pre-clinical and clinical research has shown how the renin angiotensin system (RAS), which is very important in blood pressure regulation and cardiovascular disease, warrants careful consideration in the pathogenesis of AD. Numerous components of the RAS have now been found to be altered in AD such that the multifunctional and potent vasoconstrictor angiotensin II, and similarly acting angiotensin III, are greatly altered at the expense of other RAS signaling peptides considered to contribute to neuronal and cognitive function. Collectively these changes may contribute to many of the neuropathological hallmarks of AD, as well as observed progressive deficiencies in cognitive function, while also linking elements of a number of the proposed hypotheses for the cause of AD. This review discusses the emergence of the RAS and its likely importance in AD, not only because of the multiple facets of its involvement, but also perhaps fortuitously because of the ready availability of numerous RAS-acting drugs, that could be repurposed as interventions in AD.
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Affiliation(s)
- Patrick Gavin Kehoe
- Dementia Research Group, Translational Health Sciences, Bristol Medical School, University of Bristol, Southmead Hospital, Bristol, UK
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Shen Y, Liu M, Xu M, Xu Z, Na Y, Zhang N, Geng F. Simultaneous determination of nine trace concentration angiotensin peptides in human serum using ultra high performance liquid chromatography with tandem mass spectrometry with sephadex LH-20 gel solid-phase extraction. J Sep Sci 2019; 42:2247-2254. [PMID: 31020766 DOI: 10.1002/jssc.201801276] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Revised: 04/13/2019] [Accepted: 04/20/2019] [Indexed: 12/11/2022]
Abstract
The renin-angiotensin system is a highly complex enzymatic system consisting of multiple peptide hormones, enzymes, and receptors. Here, an assay to simultaneously quantify eight angiotensin peptides and bradykinin in human serum was developed and validated, using ultra high performance liquid chromatography coupled with tandem mass spectrometry. A pre-concentration method of Sephadex LH-20 gel solid-phase extraction was first applied for analysis of angiotensin peptides from serum sample. The triple quadrupole mass spectrometer was operated in the positive ion mode and multiple reaction monitoring was used for drug quantification. The analytical time was within 5 min, much raising the analysis efficiency. Limits of detection ranged from 0.9 to 1.3 pg/mL, and displayed the same level of sensitivity compared with radioimmunoassay. The method was successfully applied to 22 healthy human serum samples, giving the concentrations of angiotensin I, angiotensin II, angiotensin III, angiotensin IV, angiotensin 1-9, angiotensin 1-7, angiotensin 1-5, Asn1 ,Val5 -Angiotensin II, and bradykinin for reference. This novel metabolic profile study of vasoactive peptides based on gel solid-phase extraction concentration provided not only an accurate quantitative assay of the serum concentrations, but also a promising methodology for evaluating the diagnostic values of the various peptides.
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Affiliation(s)
- Yue Shen
- Key Laboratory of Photochemical Biomaterials and Energy Storage Materials, College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin, P. R. China
| | - Mingyang Liu
- Key Laboratory of Photochemical Biomaterials and Energy Storage Materials, College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin, P. R. China
| | - Mingyue Xu
- Key Laboratory of Photochemical Biomaterials and Energy Storage Materials, College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin, P. R. China
| | - Zhanling Xu
- Key Laboratory of Chinese Materia Medica, College of Jiamusi, College of Pharmaceutical, Heilongjiang University of Chinese Medicine, Harbin, P. R. China
| | - Yue Na
- Key Laboratory of Photochemical Biomaterials and Energy Storage Materials, College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin, P. R. China
| | - Ning Zhang
- Key Laboratory of Chinese Materia Medica, College of Jiamusi, College of Pharmaceutical, Heilongjiang University of Chinese Medicine, Harbin, P. R. China
| | - Fang Geng
- Key Laboratory of Photochemical Biomaterials and Energy Storage Materials, College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin, P. R. China
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Huber G, Schuster F, Raasch W. Brain renin-angiotensin system in the pathophysiology of cardiovascular diseases. Pharmacol Res 2017; 125:72-90. [PMID: 28687340 DOI: 10.1016/j.phrs.2017.06.016] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Revised: 06/28/2017] [Accepted: 06/28/2017] [Indexed: 02/07/2023]
Abstract
Cardiovascular diseases (CVD) are among the main causes of death globally and in this context hypertension represents one of the key risk factors for developing a CVD. It is well established that the peripheral renin-angiotensin system (RAS) plays an important role in regulating blood pressure (BP). All components of the classic RAS can also be found in the brain but, in contrast to the peripheral RAS, how the endogenous RAS is involved in modulating cardiovascular effects in the brain is not fully understood yet. It is a complex system that may work differently in diverse areas of the brain and is linked to the peripheral system by the circumventricular organs (CVO), which do not have a blood brain barrier (BBB). In this review, we focus on the brain angiotensin peptides, their interactions with each other, and the consequences in the central nervous system (CNS) concerning cardiovascular control. Additionally, we present potential drug targets in the brain RAS for the treatment of hypertension.
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Affiliation(s)
- Gianna Huber
- Institute of Experimental and Clinical Pharmacology and Toxicology, University of Lübeck, Germany; CBBM (Center of Brain, Behavior and Metabolism), Lübeck, Germany
| | - Franziska Schuster
- Institute of Experimental and Clinical Pharmacology and Toxicology, University of Lübeck, Germany; CBBM (Center of Brain, Behavior and Metabolism), Lübeck, Germany
| | - Walter Raasch
- Institute of Experimental and Clinical Pharmacology and Toxicology, University of Lübeck, Germany; CBBM (Center of Brain, Behavior and Metabolism), Lübeck, Germany; DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Lübeck, Lübeck, Germany.
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Smolensky MH, Hermida RC, Portaluppi F. Circadian mechanisms of 24-hour blood pressure regulation and patterning. Sleep Med Rev 2017; 33:4-16. [DOI: 10.1016/j.smrv.2016.02.003] [Citation(s) in RCA: 116] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Accepted: 02/18/2016] [Indexed: 11/16/2022]
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Fernández-Atucha A, Izagirre A, Fraile-Bermúdez AB, Kortajarena M, Larrinaga G, Martinez-Lage P, Echevarría E, Gil J. Sex differences in the aging pattern of renin-angiotensin system serum peptidases. Biol Sex Differ 2017; 8:5. [PMID: 28174624 PMCID: PMC5291971 DOI: 10.1186/s13293-017-0128-8] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2016] [Accepted: 01/31/2017] [Indexed: 01/01/2023] Open
Abstract
Background Serum peptidases, such as angiotensin-converting enzyme (ACE), angiotensin-converting enzyme-2 (ACE2), neutral endopeptidase (NEP), aminopeptidase N (APN), and aminopeptidase A (APA), are important elements of the renin–angiotensin system (RAS). Dysregulation of these enzymes has been associated with hypertension and cardiovascular risk. In the present study, serum activities of RAS peptidases were analyzed to evaluate the existence of sexual differences, with a possible different pattern in pre- and post-andropausal/post-menopausal participants. Methods One hundred and eighteen healthy men and women between 41 and 70 years of age (58 women and 60 men) were recruited to participate in the study. Serum RAS-regulating enzymes were measured by spectrofluorimetry. Enzymatic activity was recorded as units of enzyme per milliliter of serum (U/mL). Results Significantly lower serum APA activity was observed in men with respect to women; no sex differences were detected for ACE, ACE2, NEP, or APN. Significantly lower APA and ACE serum activity were observed in older men compared to older women. In contrast, younger (<55 years) men had significantly higher values of NEP serum activity than younger women. Significantly lower ACE serum activity was detected in older men compared to younger men. In women, significantly higher ACE2 serum activity was observed in older women compared to younger women. Conclusions These results suggest a differential effect of aging on the activity of RAS enzymes in men and women, especially with respect to the breakpoint of andropausia/menopausia, on the critical serum enzymatic activities of the RAS, which could correlate with sexual differences in cardiovascular risk.
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Affiliation(s)
- A Fernández-Atucha
- Department of Nursing I, School of Nursing, University of the Basque Country (UPV/EHU), P.O. Box 699, E-48080 Bilbao, Bizkaia Spain
| | - A Izagirre
- Department of Neurology, CITA-Alzheimer Foundation, San Sebastian, Spain
| | - A B Fraile-Bermúdez
- Department of Nursing I, School of Nursing, University of the Basque Country (UPV/EHU), P.O. Box 699, E-48080 Bilbao, Bizkaia Spain
| | - M Kortajarena
- Department of Nursing I, School of Nursing, University of the Basque Country (UPV/EHU), P.O. Box 699, E-48080 Bilbao, Bizkaia Spain
| | - G Larrinaga
- Department of Nursing I, School of Nursing, University of the Basque Country (UPV/EHU), P.O. Box 699, E-48080 Bilbao, Bizkaia Spain
| | - P Martinez-Lage
- Department of Neurology, CITA-Alzheimer Foundation, San Sebastian, Spain
| | - E Echevarría
- Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Madrid, Spain.,Department of Physiology, Faculty of Medicine, University of the Basque Country (UPV/EHU), P.O. Box 699, E-48080 Bilbao, Bizkaia Spain
| | - J Gil
- Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Madrid, Spain.,Department of Physiology, Faculty of Medicine, University of the Basque Country (UPV/EHU), P.O. Box 699, E-48080 Bilbao, Bizkaia Spain
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Gowrisankar YV, Clark MA. Regulation of angiotensinogen expression by angiotensin II in spontaneously hypertensive rat primary astrocyte cultures. Brain Res 2016; 1643:51-8. [DOI: 10.1016/j.brainres.2016.04.059] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 04/07/2016] [Accepted: 04/25/2016] [Indexed: 01/26/2023]
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Boegehold MA, Drenjancevic I, Lombard JH. Salt, Angiotensin II, Superoxide, and Endothelial Function. Compr Physiol 2015; 6:215-54. [PMID: 26756632 DOI: 10.1002/cphy.c150008] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Proper function of the vascular endothelium is essential for cardiovascular health, in large part due to its antiproliferative, antihypertrophic, and anti-inflammatory properties. Crucial to the protective role of the endothelium is the production and liberation of nitric oxide (NO), which not only acts as a potent vasodilator, but also reduces levels of reactive oxygen species, including superoxide anion (O2•-). Superoxide anion is highly injurious to the vasculature because it not only scavenges NO molecules, but has other damaging effects, including direct oxidative disruption of normal signaling mechanisms in the endothelium and vascular smooth muscle cells. The renin-angiotensin system plays a crucial role in the maintenance of normal blood pressure. This function is mediated via the peptide hormone angiotensin II (ANG II), which maintains normal blood volume by regulating Na+ excretion. However, elevation of ANG II above normal levels increases O2•- production, promotes oxidative stress and endothelial dysfunction, and plays a major role in multiple disease conditions. Elevated dietary salt intake also leads to oxidant stress and endothelial dysfunction, but these occur in the face of salt-induced ANG II suppression and reduced levels of circulating ANG II. While the effects of abnormally high levels of ANG II have been extensively studied, far less is known regarding the mechanisms of oxidant stress and endothelial dysfunction occurring in response to chronic exposure to abnormally low levels of ANG II. The current article focuses on the mechanisms and consequences of this less well understood relationship among salt, superoxide, and endothelial function.
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Affiliation(s)
| | - Ines Drenjancevic
- Faculty of Medicine, Josip Juraj Strossmayer University of Osijek, Osijek, Croatia
| | - Julian H Lombard
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
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Chappell MC. Biochemical evaluation of the renin-angiotensin system: the good, bad, and absolute? Am J Physiol Heart Circ Physiol 2015; 310:H137-52. [PMID: 26475588 DOI: 10.1152/ajpheart.00618.2015] [Citation(s) in RCA: 172] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Accepted: 10/15/2015] [Indexed: 02/07/2023]
Abstract
The renin-angiotensin system (RAS) constitutes a key hormonal system in the physiological regulation of blood pressure through peripheral and central mechanisms. Indeed, dysregulation of the RAS is considered a major factor in the development of cardiovascular pathologies, and pharmacological blockade of this system by the inhibition of angiotensin-converting enzyme (ACE) or antagonism of the angiotensin type 1 receptor (AT1R) offers an effective therapeutic regimen. The RAS is now defined as a system composed of different angiotensin peptides with diverse biological actions mediated by distinct receptor subtypes. The classic RAS comprises the ACE-ANG II-AT1R axis that promotes vasoconstriction; water intake; sodium retention; and increased oxidative stress, fibrosis, cellular growth, and inflammation. In contrast, the nonclassical RAS composed primarily of the ANG II/ANG III-AT2R and the ACE2-ANG-(1-7)-AT7R pathways generally opposes the actions of a stimulated ANG II-AT1R axis. In lieu of the complex and multifunctional aspects of this system, as well as increased concerns on the reproducibility among laboratories, a critical assessment is provided on the current biochemical approaches to characterize and define the various components that ultimately reflect the status of the RAS.
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Affiliation(s)
- Mark C Chappell
- The Hypertension and Vascular Research Center, Wake Forest University School of Medicine, Winston-Salem, North Carolina
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Kandalam U, Sarmiento N, Haspula D, Clark MA. Angiotensin III induces signal transducer and activator of transcription 3 and interleukin-6 mRNA levels in cultured rat astrocytes. J Renin Angiotensin Aldosterone Syst 2014; 16:758-67. [PMID: 24961501 DOI: 10.1177/1470320314534509] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
INTRODUCTION Recently we established that pro-inflammatory actions of angiotensin (Ang) II in astrocytes involved Janus kinase 2 (JAK2), signal transducer and activator of transcription 3 (STAT3), and interleukin-6 (IL-6). MATERIALS AND METHODS In our current study, we determined in brainstem and cerebellum whether Ang III also activates STAT3 leading to IL-6 mRNA expression and astrocyte proliferation. RESULTS Ang III induced STAT3 phosphorylation in a concentration- and time-dependent manner. Significant STAT3 phosphorylation was rapid and was maximal within 10 min, and with 100 nM Ang III. The Ang AT1 receptor was shown to mediate this action of Ang III. Ang III also significantly induced IL-6 mRNA expression within an hour, and maximal Ang III-mediated IL-6 mRNA expression occurred in the presence of 100 nM Ang III. Ang III-mediated IL-6 mRNA expression occurred by the interaction of the peptide with the Ang AT1 receptor and was mediated by STAT3. In addition, STAT3 was shown to mediate Ang III astrocyte proliferation. CONCLUSIONS These findings suggest that Ang III, similar to Ang II, has pro-inflammatory effects since it induces STAT3 leading to an induction of IL-6 mRNA expression, outcomes that lend relevance to the physiological importance of central Ang III.
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Affiliation(s)
- Umadevi Kandalam
- Department of Pediatric Dentistry, Nova Southeastern University, USA
| | - Nancy Sarmiento
- Farquhar College of Arts and Sciences, Nova Southeastern University, USA
| | - Dhanush Haspula
- Department of Pharmaceutical Sciences, Nova Southeastern University, USA
| | - Michelle A Clark
- Department of Pharmaceutical Sciences, Nova Southeastern University, USA
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Z. Alanazi A, Patel P, Clark MA. p38 Mitogen-activated protein kinase is stimulated by both angiotensin II and angiotensin III in cultured rat astrocytes. J Recept Signal Transduct Res 2014; 34:205-11. [DOI: 10.3109/10799893.2013.876041] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Yugandhar VG, Clark MA. Angiotensin III: a physiological relevant peptide of the renin angiotensin system. Peptides 2013; 46:26-32. [PMID: 23692861 DOI: 10.1016/j.peptides.2013.04.014] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Revised: 04/23/2013] [Accepted: 04/27/2013] [Indexed: 01/02/2023]
Abstract
The renin angiotensin system (RAS) is a peptide hormone system that plays an important role in the pathophysiology of various diseases, including congestive heart failure, hypertension, myocardial infarction, and diabetic nephropathy. This has led researchers to focus extensively on this system, leading to the discovery of various peptides, peptidases, receptors and signal transduction mechanisms intrinsic to the RAS. Angiotensinogen (AGT), angiotensin (Ang) II, Ang III, Ang IV, and Ang-(1-7) are the main biologically active peptides of RAS. However, most of the available studies have focused on Ang II as the likely key peptide from the RAS that directly and indirectly regulates physiological functions leading to pathological conditions. However, data from recent studies suggest that Ang III may produce physiologically relevant effects that are similar to those produced by Ang II. Hence, this review focuses on Ang III and the myriad of physiological effects that it produces in the body.
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Affiliation(s)
- Vudhya G Yugandhar
- Department of Pharmaceutical Sciences, College of Pharmacy, Nova Southeastern University, 3200 South University Drive, Fort Lauderdale, FL 33328, USA
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AT2 receptors: beneficial counter-regulatory role in cardiovascular and renal function. Pflugers Arch 2012; 465:99-110. [PMID: 22949090 DOI: 10.1007/s00424-012-1146-3] [Citation(s) in RCA: 101] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2012] [Revised: 08/17/2012] [Accepted: 08/20/2012] [Indexed: 01/11/2023]
Abstract
The renin-angiotensin system (RAS) is a coordinated hormonal cascade intimately involved in cardiovascular and renal control and blood pressure regulation. Angiotensin II (Ang II), the major RAS effector peptide, binds two distinct receptors, the angiotensin type-1 receptor (AT(1)R) and the angiotensin type-2 (AT(2)R) receptor. The vast majority of the physiological actions of Ang II, almost all of them detrimental, are mediated by AT(1)Rs. In contrast, AT(2)Rs negatively modulate the actions of AT(1)Rs under the majority of circumstances and generally possess beneficial effects. AT(2)Rs induce vasodilation in both resistance and capacitance vessels, mediating natriuresis directly and via interactions with dopamine D1 receptors in the renal proximal tubule. AT(2)Rs inhibit renin biosynthesis and secretion and protect the kidneys from inflammation and ischemic injury. Our understanding of the exact role of AT(2)Rs in physiology and pathophysiology continues to expand; the purpose of this review is to provide an up-to-date summary of the functional role of AT(2)Rs at the organ, tissue, cellular, and subcellular levels with emphasis on the vascular and renal actions that bear on blood pressure regulation and hypertension.
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Angiotensin III Induces c-Jun N-terminal Kinase Leading to Proliferation of Rat Astrocytes. Neurochem Res 2012; 37:1475-81. [DOI: 10.1007/s11064-012-0738-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2011] [Revised: 02/09/2012] [Accepted: 02/20/2012] [Indexed: 10/28/2022]
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Clark MA, Tran H, Nguyen C. Angiotensin III stimulates ERK1/2 mitogen-activated protein kinases and astrocyte growth in cultured rat astrocytes. Neuropeptides 2011; 45:329-35. [PMID: 21788072 DOI: 10.1016/j.npep.2011.07.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2011] [Revised: 06/10/2011] [Accepted: 07/02/2011] [Indexed: 11/20/2022]
Abstract
Angiotensin (Ang) III is a biologically active metabolite of Ang II with similar effects and receptor binding properties as Ang II. Most Ang III studies delineate physiological effects of the peptide but, the intracellular pathways leading to the actions are unknown and are a focus of these studies. We investigated in cultured brainstem and cerebellum rat astrocytes whether Ang III stimulates ERK1/2 mitogen activated protein (MAP) kinases and astrocyte growth. Ang III significantly stimulated ERK1/2 MAP kinases in a dose- and time-dependent manner. The maximal stimulation occurred with 100 nM Ang III (2.8±0.3 and 2.3±0.1-fold over basal, in brainstem and cerebellum astrocytes, respectively). This stimulation occurred as early as 1 min, and was sustained for at least 15 min. Moreover, inhibition of the ERK1/2 MAP kinase pathway by 10 μM PD98059 attenuated Ang III-induced ERK1/2 phosphorylation. Ang III induction of ERK1/2 occurred via stimulation of the Ang AT(1) receptor since pretreatment with 10 μM Losartan, a selective AT(1) receptor blocker, prevented Ang III-induced ERK1/2 phosphorylation. The selective AT(2) Ang receptor blocker PD123319 was ineffective. Comparable to Ang II, Ang III also stimulated astrocyte growth in a concentration-dependent manner, an effect that occurred via activation of the AT(1) receptor as well. These findings suggest that Ang III has similar effects as Ang II in astrocytes since it rapidly stimulates the phosphorylation of the ERK1/2 MAP kinases and induces astrocyte proliferation through activation of the AT(1) receptor. These studies are important in establishing signaling pathways for Ang III and provide validation of the central role of Ang III.
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Affiliation(s)
- Michelle A Clark
- Department of Pharmaceutical Sciences, College of Pharmacy, Nova Southeastern University, Fort Lauderdale, FL 33328, United States.
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Bogra P, Singh J, Singh H. Effect of different anti-inflammatory and antihypertensive compounds on goat (Capra hircus) brain aminopeptidase B. JOURNAL OF APPLIED ANIMAL RESEARCH 2011. [DOI: 10.1080/09712119.2011.565226] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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Taylor DA, Abdel-Rahman AA. Novel strategies and targets for the management of hypertension. ADVANCES IN PHARMACOLOGY (SAN DIEGO, CALIF.) 2009; 57:291-345. [PMID: 20230765 DOI: 10.1016/s1054-3589(08)57008-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Hypertension, as the sole or comorbid component of a constellation of disorders of the cardiovascular (CV) system, is present in over 90% of all patients with CV disease and affects nearly 74 million individuals in the United States. The number of medications available to treat hypertension has dramatically increased during the past 3 decades to some 50 medications as new targets involved in the normal regulation of blood pressure have been identified, resulting in the development of new agents in those classes with improved therapeutic profiles (e.g., renin-angiotensin-aldosterone system; RAAS). Despite these new agents, hypertension is not adequately managed in approximately 30% of patients, who are compliant with prescriptive therapeutics, suggesting that new agents and/or strategies to manage hypertension are still needed. Some of the newest classes of agents have targeted other components of the RAS, for example, the selective renin inhibitors, but recent advances in vascular biology have provided novel potential targets that may provide avenues for new agent development. These newer targets include downstream signaling participants in pathways involved in contraction, growth, hypertrophy, and relaxation. However, perhaps the most unique approach to the management of hypertension is a shift in strategy of using existing agents with respect to the time of day at which the agent is taken. This new strategy, termed "chronotherapy," has shown considerable promise in effectively managing hypertensive patients. Therefore, there remains great potential for future development of safe and effective agents and strategies to manage a disorder of the CV system of epidemic proportion.
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Affiliation(s)
- David A Taylor
- Department of Pharmacology and Toxicology, Brody School of Medicine at East Carolina University, Greenville, North Carolina 27834, USA
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24
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Bourassa EA, Sved AF, Speth RC. Angiotensin modulation of rostral ventrolateral medulla (RVLM) in cardiovascular regulation. Mol Cell Endocrinol 2009; 302:167-75. [PMID: 19027823 PMCID: PMC9686041 DOI: 10.1016/j.mce.2008.10.039] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/12/2008] [Revised: 10/05/2008] [Accepted: 10/24/2008] [Indexed: 02/07/2023]
Abstract
The rostral ventrolateral medulla (RVLM) and the presympathetic bulbospinal neurons in this region play a critical role in cardiovascular regulation. However, there is ambiguity regarding the precise anatomical coordinates of the RVLM and much still needs to be learned regarding the regulation and neurochemistry of this region. This brief review discusses some of these issues and focuses on the role of angiotensin-mediated signaling in the RVLM in blood pressure regulation.
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Affiliation(s)
- Erick A. Bourassa
- Department of Pharmacology, School of Pharmacy, University of Mississippi, University, MS 38677
- Current address: Biological Sciences, Northwest Missouri State University, Maryville, MO 64468
| | - Alan F. Sved
- Department of Neuroscience and Center for Neuroscience, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
| | - Robert C. Speth
- Department of Pharmacology, School of Pharmacy, University of Mississippi, University, MS 38677
- Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, University, MS 38677
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26
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Human brain contains a novel non-AT1, non-AT2 binding site for active angiotensin peptides. Life Sci 2008; 83:421-5. [PMID: 18692076 DOI: 10.1016/j.lfs.2008.07.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2008] [Revised: 07/04/2008] [Accepted: 07/09/2008] [Indexed: 11/20/2022]
Abstract
AIMS To determine whether the novel non-AT1, non-AT2 binding site for angiotensins recently discovered in rodent brains occurs in the human brain. MAIN METHODS Radioligand binding assays of (125)I-sarcosine(1), isoleucine(8) angiotensin II binding were carried out in homogenates of the rostral pole of the temporal cortex of human brains containing 0.3 mM parachloromercuribenzoate (PCMB), 10 microM losartan to saturate AT1 receptors, 10 microM PD123319 to saturate AT2 receptors, with or without 10 microM angiotensin II to define specific binding. Competition binding assays employed a variety of angiotensin peptides, specific angiotensin receptor antagonists, several neuropeptides and an endopeptidase inhibitor to determine pharmacological specificity for this binding site. KEY FINDINGS The novel non-AT1, non-AT2 binding site was present in similar amounts in female and male brains: Bmax 1.77+/-0.16 and 1.52+/-0.17 fmol/mg initial wet weight in female and male brains, respectively. The K(D) values, 1.79+/-0.09 nM for females, and 1.53+/-0.06 nM for males were also similar. The binding site shows pharmacological specificity similar to that in rodent brains: sarcosine(1), isoleucine(8) angiotensin II>angiotensin III>angiotensin II>angiotensin I'angiotensin IV>angiotensin 1-7. Shorter angiotensin fragments and non-angiotensin peptides showed low affinity for this binding site. SIGNIFICANCE The presence in human brain of this novel non-AT1, non-AT2 binding site supports the concept that this binding site is an important component of the brain angiotensin system. The functional significance of this binding site, either as a novel angiotensin receptor or a highly specific angiotensinase remains to be determined.
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Carey RM, Padia SH. Angiotensin AT2 receptors: control of renal sodium excretion and blood pressure. Trends Endocrinol Metab 2008; 19:84-7. [PMID: 18294862 DOI: 10.1016/j.tem.2008.01.003] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/11/2008] [Revised: 01/11/2008] [Accepted: 01/11/2008] [Indexed: 01/11/2023]
Abstract
The renin-angiotensin system is a coordinated hormonal cascade of crucial importance in cardiovascular and renal function. The primary effector peptide angiotensin II functions at two major receptors, the AT1 and AT2 receptors. AT2 receptors mediate vasodilation and natriuresis. Regarding vasodilator actions, AT2 receptors oppose the AT1 receptor-mediated vasoconstrictor action of angiotensin II. Regarding the natriuretic actions of AT2 receptors, des-aspartyl 1-angiotensin II, rather than angiotensin II, is the preferred agonist. Regarding both the vasodilator and natriuretic properties of AT2 receptors, the beneficial blood pressure reduction and natriuretic responses to AT1 receptor blockade are mediated, at least in part, by AT2 receptor activation. In addition, AT2 receptor activation suppresses renin biosynthesis and release at renal juxtaglomerular cells. Therefore, AT2 receptors are potential therapeutic targets in hypertension.
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Affiliation(s)
- Robert M Carey
- Division of Endocrinology and Metabolism, Department of Medicine, University of Virginia Health Sciences Center, Charlottesville, VA 22901, USA.
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28
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Carey RM. Pathophysiology of Primary Hypertension. Microcirculation 2008. [DOI: 10.1016/b978-0-12-374530-9.00020-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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29
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Breno MC, Prezoto BC, Borgheresi RAMB, Lazari MFM, Yamanouye N. Characteristics of neural and humoral systems involved in the regulation of blood pressure in snakes. Comp Biochem Physiol A Mol Integr Physiol 2007; 147:766-778. [PMID: 17046304 DOI: 10.1016/j.cbpa.2006.09.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2006] [Revised: 09/04/2006] [Accepted: 09/05/2006] [Indexed: 12/22/2022]
Abstract
Cardiovascular function is affected by many mechanisms, including the autonomic system, the kallikrein-kinin system (KKS), the renin-angiotensin system (RAS) and the endothelin system. The function of these systems seems to be fairly well preserved throughout the vertebrate scale, but evolution required several adaptations. Snakes are particularly interesting for studies related to the cardiovascular function because of their elongated shape, their wide variation in size and length, and because they had to adapt to extremely different habitats and gravitational influences. To keep the normal cardiovascular control the snakes developed anatomical and functional adaptations and interesting structural peculiarities are found in their autonomic, KKS, RAS and endothelin systems. Our laboratory has characterized some biochemical, pharmacological and physiological properties of these systems in South American snakes. This review compares the components and function of these systems in snakes and other vertebrates, and focuses on differences found in snakes, related with receptor or ligand structure and/or function in autonomic system, RAS and KKS, absence of components in KKS and the intriguing identity between a venom and a plasma component in the endothelin system.
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Affiliation(s)
- Maria Cristina Breno
- Laboratório de Farmacologia, Instituto Butantan, Av. Vital Brazil, 1500, 05503-900, São Paulo, SP, Brazil.
| | - Benedito Carlos Prezoto
- Laboratório de Farmacologia, Instituto Butantan, Av. Vital Brazil, 1500, 05503-900, São Paulo, SP, Brazil
| | - Rosa A M B Borgheresi
- Laboratório de Farmacologia, Instituto Butantan, Av. Vital Brazil, 1500, 05503-900, São Paulo, SP, Brazil
| | - Maria Fátima M Lazari
- Departamento de Farmacologia, Setor Endocrinologia Experimental, Universidade Federal de São Paulo, Rua 3 de maio,100, 04044-020, São Paulo, SP, Brazil
| | - Norma Yamanouye
- Laboratório de Farmacologia, Instituto Butantan, Av. Vital Brazil, 1500, 05503-900, São Paulo, SP, Brazil
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Segarra AB, Wangensteen R, Ramírez M, Banegas I, Hermoso F, Vargas F, Vives F, Durán R, Alba F, de Gasparo M, Prieto I. Atrial Angiotensinase Activity in Hypothyroid, Euthyroid, and Hyperthyroid Rats. J Cardiovasc Pharmacol 2006; 48:117-20. [PMID: 17031265 DOI: 10.1097/01.fjc.0000244233.08356.3f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Thyroid dysfunction produces marked cardiovascular responses. Hypothyroidism and hyperthyroidism cause important changes in the circulating renin-angiotensin system (RAS). Modifications in cardiac RAS have also been involved in cardiovascular alterations. Studies have revealed that thyroid hormones activate some components of cardiac RAS. Angiotensin (Ang) peptides are regulated by the activity of several aminopeptidases (AP) called angiotensinases. Previous results in our laboratory have demonstrated that thyroid dysfunction altered angiotensinase activities in hypothalamus, pituitary, and kidney. In the present study, we investigated the relationship between thyroid status and local angiotensinase activities in the atrium of hypothyroid, euthyroid, and hyperthyroid adult male rats. We have determined fluorometrically soluble and membrane-bound alanyl, glutamyl, and aspartyl aminopeptidase activities using naphthylamide derivatives as substrates. These activities have been, respectively, involved in the metabolism of Ang III to Ang IV, Ang II to Ang III, and Ang I to des-Asp Ang I. Hyperthyroidism was induced with subcutaneous injections of tetraiodothyronine (300 microg/kg/day), and the hypothyroid rats were obtained with 0.03% methimazole via the drinking water. Compared with that in euthyroid rats, a highly significant increase (by 50%) of soluble aspartyl aminopeptidase activity (P < 0.001) was observed in the atrium of hyperthyroid and hypothyroid animals. In membrane fractions, T4 treatment produced an increase in alanyl aminopeptidase (37%; P < 0.05) and aspartyl aminopeptidase activities (30%; P < 0.01). These results suggest higher formation of des-Asp Ang I in both hypothyroid and hyperthyroid rats but also suggest higher metabolism of Ang III to Ang IV in hyperthyroid animals, which is in agreement with the described alterations of cardiac RAS after thyroid dysfunction.
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Affiliation(s)
- Ana B Segarra
- Unit of Physiology, Department of Health Sciences, University of Jaén, Jaén, Spain
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Cogolludo A, Pérez-Vizcaíno F, Tamargo J. New insights in the pharmacological therapy of arterial hypertension. Curr Opin Nephrol Hypertens 2005; 14:423-7. [PMID: 16046899 DOI: 10.1097/01.mnh.0000168334.09454.1c] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
PURPOSE OF REVIEW Despite the large number of antihypertensive drugs available, their usefulness is limited due to low efficacy, side effects, poor patient compliance and failure to reduce the cardiovascular risk to the level of the general population. These limitations have stimulated the research and development of new antihypertensive drugs, which we briefly review herein. RECENT FINDINGS Novel antihypertensive drugs under development include new oral renin inhibitors, brain aminopeptidase A inhibitors, angiotensin-converting enzyme 2 modulators, short-acting L-type Ca channel blockers, new T-type Ca channel blockers, inhibitors of vascular NAD(P)H oxidase, angiotensin-converting enzyme crosslink breakers, Rho kinase inhibitors, renal Na/K ATPase inhibitors, potassium channel openers and drugs combining different mechanisms of action. SUMMARY Essential hypertension is a multifactorial and multigenic disorder, which means that various mechanisms contribute to a greater or lesser extent to increasing blood pressure. Drugs combining several mechanisms of action or combinations of antihypertensive drugs with those targeting other risk factors may offer an alternative to reduce overall cardiovascular risk. As we improve our understanding of essential hypertension, it should be possible to develop safer and more effective antihypertensive drugs. The risk/benefit ratio of these new existing antihypertensive drugs will require long-term endpoint assessment studies.
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Affiliation(s)
- Angel Cogolludo
- Department of Pharmacology, School of Medicine, Universidad Complutense, Av/Complutense s/n, 28040 Madrid, Spain
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