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Hula N, Vu J, Quon A, Kirschenman R, Spaans F, Liu R, Cooke CLM, Davidge ST. Sex-Specific Effects of Prenatal Hypoxia on the Cardiac Endothelin System in Adult Offspring. Am J Physiol Heart Circ Physiol 2022; 322:H442-H450. [PMID: 35119336 DOI: 10.1152/ajpheart.00636.2021] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Fetal hypoxia, a major consequence of complicated pregnancies, impairs offspring cardiac tolerance to ischemia/reperfusion (I/R) insult, however, the mechanisms remain unknown. Endothelin-1 (ET-1) signaling through the endothelin A receptors (ETA) is associated with cardiac dysfunction. We hypothesized that prenatal hypoxia exacerbates cardiac susceptibility to I/R via increased ET-1 and ETA levels, while ETA inhibition ameliorates this. Pregnant Sprague-Dawley rats were exposed to normoxia (21% O2) or hypoxia (11% O2) on gestational days 15-21. Offspring were aged to 4 months, and hearts were aerobically perfused or subjected to ex vivo I/R, with or without pre-infusion with an ETA antagonist (ABT-627). ET-1 levels were assessed with ELISA in aerobically perfused and post-I/R left ventricles (LV). ETA and ETB levels were assessed by Western blotting in non-perfused LV. As hypothesized, ABT-627 infusion tended to improve post-I/R recovery in hypoxic females (p=0.0528), however, surprisingly, ABT-627 prevented post-I/R recovery only in the hypoxic males (p<0.001). ET-1 levels were increased in post-I/R LV in both sexes regardless of the prenatal exposure (p<0.01). ETA expression was similar among all groups, while ETB (isoform C) levels were decreased in prenatally hypoxic females (p<0.05). In prenatally hypoxic males, ETA signaling may be essential for tolerance to I/R, while in prenatally hypoxic females, ETA may contribute to cardiac dysfunction. Our data illustrate that understanding the prenatal history has critical implications for treatment strategies in adult chronic diseases.
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Affiliation(s)
- Nataliia Hula
- Department of Physiology, University of Alberta, Edmonton, Canada.,Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, AB, Canada
| | - Jennie Vu
- Department of Physiology, University of Alberta, Edmonton, Canada
| | - Anita Quon
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, AB, Canada
| | - Raven Kirschenman
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, AB, Canada
| | - Floor Spaans
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, AB, Canada
| | - Ricky Liu
- Department of Physiology, University of Alberta, Edmonton, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, AB, Canada
| | - Christy-Lynn M Cooke
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, AB, Canada
| | - Sandra T Davidge
- Department of Physiology, University of Alberta, Edmonton, Canada.,Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, AB, Canada
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Feng D, Cao K, He ZZ, Knibbs LD, Jalaludin B, Leskinen A, Roponen M, Komppula M, Jalava P, Guo PY, Xu SL, Yang BY, Hu L, Zeng XW, Chen G, Yu HY, Lin L, Dong G. Short-Term Effects of Particle Sizes and Constituents on Blood Biomarkers among Healthy Young Adults in Guangzhou, China. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:5636-5647. [PMID: 33822602 DOI: 10.1021/acs.est.0c06609] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Evidence of the effects of various particle sizes and constituents on blood biomarkers is limited. We performed a panel study with five repeated measurements in 88 healthy college students in Guangzhou, China between December 2017 and January 2018. Mass concentrations of particles with aerodynamic diameters ≤ 2.5 μm (PM2.5), PM1, and PM0.5 and number concentrations of particles with aerodynamic diameters ≤ 200 nm (PN0.2) and PN0.1 were measured. We used linear mixed-effect models to explore the associations of size-fractionated particulate matter and PM2.5 constituents with five blood biomarkers 0-5 days prior to blood collection. We found that an interquartile range (45.9 μg/m3) increase in PM2.5 concentration was significantly associated with increments of 16.6, 3.4, 12.3, and 8.8% in C-reactive protein (CRP), monocyte chemoattractant protein-1 (MCP-1), soluble vascular cell adhesion molecule-1 (sVCAM-1), and endothelin-1(ET-1) at a 5-day lag, respectively. Similar estimates were observed for PM1, PM0.5, PN0.2, and PN0.1. For PM2.5 constituents, consistent positive associations were observed between F- and sVCAM-1 and CRP and between NH4+ and MCP-1, and negative associations were found between Na+ and MCP-1 and ET-1, between Cl- and MCP-1, and between Mg2+ and sVCAM-1. Our results suggested that both particle size and constituent exposure are significantly associated with circulating biomarkers among healthy Chinese adults. Particularly, PN0.1 at a 5-day lag and F- and NH4+ are the most associated with these blood biomarkers.
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Affiliation(s)
- Dan Feng
- Guangdong Provincial Engineering Technology Research Center of Environmental Pollution and Health Risk Assessment, Department of Occupational and Environmental Health, School of Public Health, Sun Yat-sen University, Guangzhou 510080, China
| | - Ke Cao
- Guangdong Provincial Engineering Technology Research Center of Environmental Pollution and Health Risk Assessment, Department of Occupational and Environmental Health, School of Public Health, Sun Yat-sen University, Guangzhou 510080, China
| | - Zhi-Zhou He
- Guangdong Provincial Engineering Technology Research Center of Environmental Pollution and Health Risk Assessment, Department of Occupational and Environmental Health, School of Public Health, Sun Yat-sen University, Guangzhou 510080, China
| | - Luke D Knibbs
- School of Public Health, The University of Queensland, Herston, Brisbane, Queensland 4006, Australia
| | - Bin Jalaludin
- Centre for Air Quality and Health Research and Evaluation, Glebe, NSW 2037, Australia
- Ingham Institute for Applied Medial Research, University of New South Wales, Sydney 2170, Australia
| | - Ari Leskinen
- Finnish Meteorological Institute, Kuopio 70211, Finland
- Department of Applied Physics, University of Eastern Finland, Kuopio 70211, Finland
| | - Marjut Roponen
- Department of Environmental and Biological Sciences, University of Eastern Finland, Kuopio FI 70211, Finland
| | - Mika Komppula
- Finnish Meteorological Institute, Kuopio 70211, Finland
| | - Pasi Jalava
- Department of Environmental and Biological Sciences, University of Eastern Finland, Kuopio FI 70211, Finland
| | - Peng-Yue Guo
- Guangdong Provincial Engineering Technology Research Center of Environmental Pollution and Health Risk Assessment, Department of Occupational and Environmental Health, School of Public Health, Sun Yat-sen University, Guangzhou 510080, China
| | - Shu-Li Xu
- Guangdong Provincial Engineering Technology Research Center of Environmental Pollution and Health Risk Assessment, Department of Occupational and Environmental Health, School of Public Health, Sun Yat-sen University, Guangzhou 510080, China
| | - Bo-Yi Yang
- Guangdong Provincial Engineering Technology Research Center of Environmental Pollution and Health Risk Assessment, Department of Occupational and Environmental Health, School of Public Health, Sun Yat-sen University, Guangzhou 510080, China
| | - Liwen Hu
- Guangdong Provincial Engineering Technology Research Center of Environmental Pollution and Health Risk Assessment, Department of Occupational and Environmental Health, School of Public Health, Sun Yat-sen University, Guangzhou 510080, China
| | - Xiao-Wen Zeng
- Guangdong Provincial Engineering Technology Research Center of Environmental Pollution and Health Risk Assessment, Department of Occupational and Environmental Health, School of Public Health, Sun Yat-sen University, Guangzhou 510080, China
| | - Gongbo Chen
- Guangdong Provincial Engineering Technology Research Center of Environmental Pollution and Health Risk Assessment, Department of Occupational and Environmental Health, School of Public Health, Sun Yat-sen University, Guangzhou 510080, China
| | - Hong-Yao Yu
- Guangdong Provincial Engineering Technology Research Center of Environmental Pollution and Health Risk Assessment, Department of Occupational and Environmental Health, School of Public Health, Sun Yat-sen University, Guangzhou 510080, China
| | - Lizi Lin
- Guangdong Provincial Engineering Technology Research Center of Environmental Pollution and Health Risk Assessment, Department of Occupational and Environmental Health, School of Public Health, Sun Yat-sen University, Guangzhou 510080, China
| | - Guanghui Dong
- Guangdong Provincial Engineering Technology Research Center of Environmental Pollution and Health Risk Assessment, Department of Occupational and Environmental Health, School of Public Health, Sun Yat-sen University, Guangzhou 510080, China
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Mo R, Yang YM, Yu LT, Tan HQ, Zhu J. Elevated Plasma Big Endothelin-1 at Admission Is Associated With Poor Short-Term Outcomes in Patients With Acute Decompensated Heart Failure. Front Cardiovasc Med 2021; 8:629268. [PMID: 33778022 PMCID: PMC7990871 DOI: 10.3389/fcvm.2021.629268] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2020] [Accepted: 02/01/2021] [Indexed: 12/11/2022] Open
Abstract
Objective: We aimed to evaluate the association between plasma big endothelin-1 (ET-1) at admission and short-term outcomes in acute decompensated heart failure (ADHF) patients. Methods: In this single-center, retrospective study, a total of 746 ADHF patients were enrolled and divided into three groups according to baseline plasma big ET-1 levels: tertile 1 (<0.43 pmol/L, n = 250), tertile 2 (between 0.43 and 0.97 pmol/L, n = 252), and tertile 3 (>0.97 pmol/L, n = 244). The primary outcomes were all-cause death, cardiac arrest, or utilization of mechanical support devices during hospitalization. Logistic regression analysis and net reclassification improvement approach were applied to assess the predictive power of big ET-1 on short-term outcomes. Results: During hospitalization, 92 (12.3%) adverse events occurred. Etiology, arterial pH, lactic acid, total bilirubin, serum creatine, serum uric acid, presence of atrial fibrillation and N-terminal pro-B-type natriuretic peptide (NT-proBNP) levels were positively correlated with plasma big ET-1 level, whereas systolic blood pressure, serum sodium, hemoglobin, albumin, and estimated glomerular filtration rate were negatively correlated. In multivariate logistic regression, tertile 3 compared with tertile 1 had a 3.68-fold increased risk of adverse outcomes [odds ratio (OR) = 3.681, 95% confidence interval (CI) 1.410–9.606, p = 0.008]. However, such adverse effect did not exist between tertile 2 and tertile 1 (OR = 0.953, 95% CI 0.314–2.986, p = 0.932). As a continuous variable, big ET-1 level was significantly associated with primary outcome (OR = 1.756, 95% CI 1.413–2.183, p < 0.001). The C statistic of baseline big ET-1 was 0.66 (95% CI 0.601–0.720, p < 0.001). Net reclassification index (NRI) analysis showed that big ET-1 provided additional predictive power when combining it to NT-proBNP (NRI = 0.593, p < 0.001). Conclusion: Elevated baseline big ET-1 is an independent predictor of short-term adverse events in ADHF patients and may provide valuable information for risk stratification.
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Affiliation(s)
- Ran Mo
- State Key Laboratory of Cardiovascular Disease, Emergency and Intensive Care Center, National Center for Cardiovascular Diseases, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yan-Min Yang
- State Key Laboratory of Cardiovascular Disease, Emergency and Intensive Care Center, National Center for Cardiovascular Diseases, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Li-Tian Yu
- State Key Laboratory of Cardiovascular Disease, Emergency and Intensive Care Center, National Center for Cardiovascular Diseases, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Hui-Qiong Tan
- State Key Laboratory of Cardiovascular Disease, Emergency and Intensive Care Center, National Center for Cardiovascular Diseases, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Jun Zhu
- State Key Laboratory of Cardiovascular Disease, Emergency and Intensive Care Center, National Center for Cardiovascular Diseases, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
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Lee KH, Lee HS. Hypertension and diabetes mellitus as risk factors for asthma in Korean adults: the Sixth Korea National Health and Nutrition Examination Survey. Int Health 2021; 12:246-252. [PMID: 31608936 PMCID: PMC7322203 DOI: 10.1093/inthealth/ihz067] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Revised: 05/10/2019] [Accepted: 07/06/2019] [Indexed: 01/03/2023] Open
Abstract
Background Asthma is a chronic inflammatory disease that may associate with other chronic diseases such as hypertension and diabetes. We observed the effects of blood pressure (BP), fasting blood glucose (FBG), haemoglobin A1c (HbA1c) and insulin on asthma in Korean adults. Methods Data from 5045 adults were taken from the 2015 Sixth Korea National Health and Nutrition Examination Survey and analysed using a multiple logistic regression model. Results By age, the probability of asthma occurrence was 1.02 times higher (adjusted odds ratio [aOR] 1.02 [95% CI 1.01 to 1.03]). Specifically, asthma occurrence was increased in individuals >66 years of age (aOR 2.40 [95% CI 1.22 to 4.72]). The probability of asthma occurrence in females was higher than in males (aOR 1.73 [95% CI 1.02 to 2.84]). Hypertension and systolic blood pressure (SBP) were found to increase the probability of asthma occurrence by 1.43- and 1.03-fold, respectively. Diabetes mellitus (DM) was another factor that increased with the occurrence of asthma (aOR 1.75 [95% CI 1.06 to 3.02]). The probability of asthma occurrence was not increased with the FBG level, whereas HbA1c (aOR 1.38 [95% CI 1.03 to 1.84]) and insulin levels (aOR 1.02 [95% CI 1.01 to 1.04]) were shown to increase the occurrence of asthma. Conclusions Age, sex, hypertension, SBP, DM, HbA1c and insulin levels are all factors that may influence the occurrence of asthma in Korean adults. In particular, hypertension and diabetes emerge from the present study as potential associated factors for the development of asthma.
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Affiliation(s)
- Kyung Hee Lee
- Department of Dental Hygiene, Division of Health Science, Dongseo University, Busan, South Korea
| | - Hea Shoon Lee
- Department of Nursing, Hannam University, Daejeon, South Korea
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The Efficacy of Tai Chi and Qigong Exercises on Blood Pressure and Blood Levels of Nitric Oxide and Endothelin-1 in Patients with Essential Hypertension: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2020; 2020:3267971. [PMID: 32802122 PMCID: PMC7414352 DOI: 10.1155/2020/3267971] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Accepted: 06/09/2020] [Indexed: 12/12/2022]
Abstract
Objective Tai Chi and Qigong are the two similar traditional Chinese wellness exercises. A strong body of published clinical randomized controlled trials (RCTs) has investigated the health benefits of Tai Chi and Qigong exercises (TCQE) in patients with essential hypertension (EH). This is the first meta-analysis to evaluate the efficacy of TCQE on blood pressure (BP) and blood levels of nitric oxide (NO) and endothelin-1 (ET-1) in EH patients and explore the potential antihypertensive mechanism of TCQE. Methods We conducted a literature retrieval for Chinese and English studies in seven databases from their respective inceptions until January 14, 2020. All RCTs examining clinical efficacy of TCQE for EH patients were considered. The major therapeutic outcomes of TCQE were changes in the blood levels of NO, ET-1, and BP in EH patients. Methodological quality of the included RCTs was detected via The Cochrane Risk of Bias tool. We evaluated the data reported and performed the meta-analysis by Review Manager 5.3 software. Results 9 RCTs involving 516 EH patients were included. The intervention duration lasted from 1.5 months to 6 months. The results of comprehensive analysis showed that compared with control interventions, experimental interventions were more effective in reducing the systolic blood pressure and the diastolic blood pressure and contributed higher blood levels of NO and lower blood levels of ET-1. Conclusions TCQE could be an effective complementary and alternative therapy for EH. The lower BP in EH patients who practice TCQE may have some connection with exercise-related increased blood NO levels and decreased blood ET-1 levels. However, further research is needed to make clear the efficacy of TCQE in management of EH and the mechanism of lowering BP in TCQE.
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6
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Improved and single-pot process for the synthesis of macitentan, an endothelin receptor antagonist, via lithium amide-mediated nucleophilic substitution. MONATSHEFTE FUR CHEMIE 2018. [DOI: 10.1007/s00706-017-2098-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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7
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Bolli MH, Boss C, Binkert C, Buchmann S, Bur D, Hess P, Iglarz M, Meyer S, Rein J, Rey M, Treiber A, Clozel M, Fischli W, Weller T. The Discovery of N-[5-(4-Bromophenyl)-6-[2-[(5-bromo-2-pyrimidinyl)oxy]ethoxy]-4-pyrimidinyl]-N′-propylsulfamide (Macitentan), an Orally Active, Potent Dual Endothelin Receptor Antagonist. J Med Chem 2012; 55:7849-61. [DOI: 10.1021/jm3009103] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Martin H. Bolli
- Drug Discovery Chemistry, Actelion Pharmaceuticals
Ltd., Gewerbestrasse 16, CH-4123 Allschwil, Switzerland
| | - Christoph Boss
- Drug Discovery Chemistry, Actelion Pharmaceuticals
Ltd., Gewerbestrasse 16, CH-4123 Allschwil, Switzerland
| | - Christoph Binkert
- Drug Discovery Chemistry, Actelion Pharmaceuticals
Ltd., Gewerbestrasse 16, CH-4123 Allschwil, Switzerland
| | - Stephan Buchmann
- Drug Discovery Chemistry, Actelion Pharmaceuticals
Ltd., Gewerbestrasse 16, CH-4123 Allschwil, Switzerland
| | - Daniel Bur
- Drug Discovery Chemistry, Actelion Pharmaceuticals
Ltd., Gewerbestrasse 16, CH-4123 Allschwil, Switzerland
| | - Patrick Hess
- Drug Discovery Chemistry, Actelion Pharmaceuticals
Ltd., Gewerbestrasse 16, CH-4123 Allschwil, Switzerland
| | - Marc Iglarz
- Drug Discovery Chemistry, Actelion Pharmaceuticals
Ltd., Gewerbestrasse 16, CH-4123 Allschwil, Switzerland
| | - Solange Meyer
- Drug Discovery Chemistry, Actelion Pharmaceuticals
Ltd., Gewerbestrasse 16, CH-4123 Allschwil, Switzerland
| | - Josiane Rein
- Drug Discovery Chemistry, Actelion Pharmaceuticals
Ltd., Gewerbestrasse 16, CH-4123 Allschwil, Switzerland
| | - Markus Rey
- Drug Discovery Chemistry, Actelion Pharmaceuticals
Ltd., Gewerbestrasse 16, CH-4123 Allschwil, Switzerland
| | - Alexander Treiber
- Drug Discovery Chemistry, Actelion Pharmaceuticals
Ltd., Gewerbestrasse 16, CH-4123 Allschwil, Switzerland
| | - Martine Clozel
- Drug Discovery Chemistry, Actelion Pharmaceuticals
Ltd., Gewerbestrasse 16, CH-4123 Allschwil, Switzerland
| | - Walter Fischli
- Drug Discovery Chemistry, Actelion Pharmaceuticals
Ltd., Gewerbestrasse 16, CH-4123 Allschwil, Switzerland
| | - Thomas Weller
- Drug Discovery Chemistry, Actelion Pharmaceuticals
Ltd., Gewerbestrasse 16, CH-4123 Allschwil, Switzerland
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Stricklett PK, Strait KA, Kohan DE. Novel regulation of endothelin-1 promoter activity by protein kinase C. Cell Biochem Biophys 2012; 61:643-50. [PMID: 21818684 DOI: 10.1007/s12013-011-9250-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Endothelin-1 (ET-1) is produced in unusually large amounts by the renal collecting duct and acts locally to control renal salt and water excretion and arterial pressure; disorders of collecting duct ET-1 activity can cause marked hypertension. The mechanisms regulating collecting duct ET-1 synthesis are, however, poorly understood. In this study, we investigated the role of protein kinase C (PKC), a known regulator of ET-1 production in endothelial cells, in (1) the control of collecting duct ET-1 production; and (2) the modulation of ET-1 promoter region activity. Cultured rat inner medullary collecting duct (IMCD) cells were studied. Calphostin C, a PKC inhibitor, greatly reduced IMCD ET-1 release. Sustained exposure to phorbol myristate acetate (PMA) also decreased ET-1 secretion. PKC inhibition decreased steady-state ET-1 mRNA content. A brief exposure (15 min) to PMA augmented ET-1 mRNA levels, while prolonged PMA exposure (120 min) reduced ET-1 mRNA content, PKC inhibition did not affect ET-1 mRNA stability. Transfection of ET-1 promoter-luciferase reporter constructs into IMCD cells demonstrated that PKC inhibition reduced activity of only the larger promoter fragments (containing at least 1,725 bp 5' to the ET-1 gene transcription start site). Mutation of a previously identified AP-1 site at -186 in the ET-1 promoter greatly reduced activity of transfected ET-1 promoter-reporter constructs (containing 366 or 1,725 bp 5' to the transcription start site); however, this region appears not to be regulated by PKC in IMCD cells. In summary, PKC stimulates collecting duct ET-1 synthesis via transcriptional activation of the ET-1 promoter. Such transcriptional activation occurs at a heretofore undescribed PKC-regulated region of the ET-1 promoter.
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Affiliation(s)
- Peter K Stricklett
- Division of Nephrology, University of Utah Health Sciences Center, Salt Lake City, UT 84132, USA
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Kittikulsuth W, Pollock JS, Pollock DM. Sex differences in renal medullary endothelin receptor function in angiotensin II hypertensive rats. Hypertension 2011; 58:212-8. [PMID: 21646601 DOI: 10.1161/hypertensionaha.111.172734] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We hypothesized that angiotensin (Ang) II hypertensive rats have impaired natriuresis after renal medullary endothelin (ET) B receptor stimulation that would be more evident in male versus female rats. Acute intramedullary infusion of the ET(B) agonist sarafotoxin 6c in normotensive male rats increased sodium excretion from 0.51±0.11 μmol/min during baseline to 1.64±0.19 μmol/min (P<0.05) after S6c. After 2 weeks of Ang II infusion (260 ng/kg per minute SC), male rats had an attenuated natriuretic response to S6c of 0.62±0.16 μmol/min during baseline versus 0.95±0.07 μmol/min after S6c. In contrast, ET(B)-dependent natriuresis was similar in female hypertensive rats (0.48±0.07 versus 1.5±0.18 μmol/min; P<0.05) compared with normotensive controls (1.05±0.07 versus 2.14±0.24 μmol/min; P<0.05). Because ET(A) receptors also mediate natriuresis in normotensive female rats, we examined ET(A) receptor function in female Ang II hypertensive rats. Intramedullary infusion of ET-1 increased sodium excretion in both hypertensive and normotensive female rats, which was partially blocked by the ET(A) antagonist BQ-123. Maximum ET(B) receptor binding in inner medullary membrane preparations was comparable between vehicle and Ang II hypertensive females; however, maximum ET(B) binding was significantly lower in male hypertensive rats (1952±251 versus 985±176 fmol/mg; P<0.05). These results indicate that renal ET(B) function is impaired in male Ang II hypertension attributed, at least in part, to a reduced number of ET(B) binding sites. Furthermore, renal ET receptor function is preserved in female rats during chronic Ang II infusion, suggesting that renal ET receptor function could serve to limit hypertension in females compared with males.
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Affiliation(s)
- Wararat Kittikulsuth
- Georgia Health Sciences University, 1459 Laney Walker Blvd, Augusta, GA 30912, USA
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Lima VV, Giachini FR, Hardy DM, Webb RC, Tostes RC. O-GlcNAcylation: a novel pathway contributing to the effects of endothelin in the vasculature. Am J Physiol Regul Integr Comp Physiol 2010; 300:R236-50. [PMID: 21068200 DOI: 10.1152/ajpregu.00230.2010] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Glycosylation with O-linked β-N-acetylglucosamine (O-GlcNAc) or O-GlcNAcylation on serine and threonine residues of nuclear and cytoplasmic proteins is a posttranslational modification that alters the function of numerous proteins important in vascular function, including kinases, phosphatases, transcription factors, and cytoskeletal proteins. O-GlcNAcylation is an innovative way to think about vascular signaling events both in physiological conditions and in disease states. This posttranslational modification interferes with vascular processes, mainly vascular reactivity, in conditions where endothelin-1 (ET-1) levels are augmented (e.g. salt-sensitive hypertension, ischemia/reperfusion, and stroke). ET-1 plays a crucial role in the vascular function of most organ systems, both in physiological and pathophysiological conditions. Recognition of ET-1 by the ET(A) and ET(B) receptors activates intracellular signaling pathways and cascades that result in rapid and long-term alterations in vascular activity and function. Components of these ET-1-activated signaling pathways (e.g., mitogen-activated protein kinases, protein kinase C, RhoA/Rho kinase) are also targets for O-GlcNAcylation. Recent experimental evidence suggests that ET-1 directly activates O-GlcNAcylation, and this posttranslational modification mediates important vascular effects of the peptide. This review focuses on ET-1-activated signaling pathways that can be modified by O-GlcNAcylation. A brief description of the O-GlcNAcylation biology is presented, and its role on vascular function is addressed. ET-1-induced O-GlcNAcylation and its implications for vascular function are then discussed. Finally, the interplay between O-GlcNAcylation and O-phosphorylation is addressed.
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Affiliation(s)
- Victor V Lima
- Department of Physiology, Medical College of Georgia, Augusta, Georgia, USA
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Synthesis and pharmacological activity of 1,3,6-trisubstituted-4-oxo-1,4-dihydroquinoline-2-carboxylic acids as selective ETA antagonists. Bioorg Med Chem Lett 2010; 20:6840-4. [DOI: 10.1016/j.bmcl.2010.08.074] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2010] [Accepted: 08/16/2010] [Indexed: 11/21/2022]
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12
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Gao S, Long CL, Wang RH, Wang H. K(ATP) activation prevents progression of cardiac hypertrophy to failure induced by pressure overload via protecting endothelial function. Cardiovasc Res 2009; 83:444-56. [PMID: 19304734 DOI: 10.1093/cvr/cvp099] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
AIMS We investigated the effects of iptakalim, a new ATP-sensitive potassium channel (K(ATP)) opener providing endothelial protection, on the progression of cardiac hypertrophy to failure in a rat model of pressure overloading caused by abdominal aortic banding (AAB). Endothelial dysfunction is central to cardiac hypertrophy and failure induced by pressure overload. It would be useful to clarify whether iptakalim could prevent this. METHODS AND RESULTS The effects of pressure overload were assessed in male Sprague-Dawley rats 6 weeks after AAB using progression of cardiac hypertrophy to heart failure as the endpoint. The AAB-treated rats had significantly elevated blood pressure, systolic and diastolic cardiac dysfunction, evidence of left ventricular hypertrophy (LVH), and transition to heart failure. LVH was characterized by increases in the ratios of heart and left ventricular weights to body weight, increased myocyte cross-sectional areas, myocardial and perivascular fibrosis, and elevated cardiac hydroxyproline. These could be prevented by treatment with iptakalim at daily oral doses of 1, 3, and 9 mg/kg for 6 weeks. Progression to cardiac failure, demonstrated by increases in relative lung and right ventricular weights, cardiac function disorders and overexpression of atrial and B-type natriuretic peptide mRNA, could also be prevented. The downregulated nitric oxide signalling system was enhanced, whereas the upregulated endothelin signalling system was inhibited, resulting in normalization of the balance between these two systems. CONCLUSION Iptakalim protected the endothelium and prevented progression of cardiac hypertrophy to failure induced by a pressure overload.
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Affiliation(s)
- Shan Gao
- Department of Cardiovascular Pharmacology, Beijing Institute of Pharmacology and Toxicology, Beijing 100850, China
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Johnson M, Nriagu J, Hammad A, Savoie K, Jamil H. Asthma, environmental risk factors, and hypertension among Arab Americans in metro Detroit. J Immigr Minor Health 2008; 12:640-51. [PMID: 18998210 DOI: 10.1007/s10903-008-9205-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2007] [Accepted: 10/20/2008] [Indexed: 12/22/2022]
Abstract
Asthma and obesity-related health problems disproportionately impact low-income ethnic minority communities residing in urban areas. Environmental risk factors, particularly those related to housing and indoor air, may impact the development or exacerbation of asthma. There is increasing evidence to suggest a link between obesity-related health problems and asthma. Previous studies have also reported that immigrant status may influence myriad risk factors and health outcomes among immigrant populations. The Arab American Environmental Health Project (AAEHP) was the first study to explore environmental health problems among Arab Americans. This paper examined whether hypertensive status modified the relationship between environmental risk factors and asthma among Arab Americans in metro Detroit. An environmental risk index (ERI) was used to quantify household environmental risk factors associated with asthma. Physician diagnosed hypertension was self-reported, and asthma status was determined using responses to a validated symptoms checklist and self-reported diagnosis by a physician. Hypertension significantly modified the relationship between ERI and asthma in this study population. The positive association between household environmental risk factors and asthma was stronger among participants diagnosed with hypertension. Effect modification of the relationship between environmental risk factors and asthma could have serious implications among high-risk communities. However, further research is needed to elucidate the relationships between hypertension, environmental risk factors, and asthma.
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Affiliation(s)
- Markey Johnson
- Epidemiology and Biomarkers Branch, Human Studies Division MD 58A, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711, USA.
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