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Cao J, Zhang D, Li W, Yuan W, Luo G, Xie S. Azilsartan improves urinary albumin excretion in hypertension mice. Aging (Albany NY) 2024; 16:4138-4148. [PMID: 38462692 DOI: 10.18632/aging.205271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Accepted: 05/31/2023] [Indexed: 03/12/2024]
Abstract
Hypertension is one of the most important risk factors for chronic kidney diseases, leading to hypertensive nephrosclerosis, including excessive albuminuria. Azilsartan, an angiotensin II type 1 receptor blocker, has been widely used for the treatment of hypertension. However, the effects of Azilsartan on urinary albumin excretion in hypertension haven't been reported before. In this study, we investigated whether Azilsartan possesses a beneficial property against albuminuria in mice treated with angiotensin II and a high-salt diet (ANG/HS). Compared to the control group, the ANG/HS group had higher blood pressure, oxidative stress, and inflammatory response, all of which were rescued by Azilsartan dose-dependently. Importantly, the ANG/HS-induced increase in urinary albumin excretion and decrease in the expression of occludin were reversed by Azilsartan. Additionally, it was shown that increased fluorescence intensity of FITC-dextran, declined trans-endothelial electrical resistance (TEER) values, and reduction of occludin and krüppel-like factor 2 (KLF2) were observed in ANG/HS-treated human renal glomerular endothelial cells (HrGECs), then prevented by Azilsartan. Moreover, the regulatory effect of Azilsartan on endothelial monolayer permeability in ANG/HS-treated HrGECs was abolished by the knockdown of KLF2, indicating KLF2 is required for the effect of Azilsartan. We concluded that Azilsartan alleviated diabetic nephropathy-induced increase in Uterine artery embolization (UAE) mediated by the KLF2/occludin axis.
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Affiliation(s)
- Jun Cao
- Department of Nephrology, People’s Hospital of Ganzhou, Ganzhou 341001, Jiangxi Province, China
| | - Dandan Zhang
- Department of Nephrology, People’s Hospital of Ganzhou, Ganzhou 341001, Jiangxi Province, China
| | - Wenfeng Li
- Department of Nephrology, People’s Hospital of Ganzhou, Ganzhou 341001, Jiangxi Province, China
| | - Wenjin Yuan
- Department of Nephrology, People’s Hospital of Ganzhou, Ganzhou 341001, Jiangxi Province, China
| | - Gang Luo
- Department of Nephrology, People’s Hospital of Ganzhou, Ganzhou 341001, Jiangxi Province, China
| | - Shaofeng Xie
- Department of Nephrology, People’s Hospital of Ganzhou, Ganzhou 341001, Jiangxi Province, China
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Wang Y, Wang M, Su H, Song J, Ren M, Hu P, Liu G, Tong X. SERCA2 dysfunction triggers hypertension by interrupting mitochondrial homeostasis and provoking oxidative stress. Free Radic Biol Med 2024; 212:284-294. [PMID: 38163553 DOI: 10.1016/j.freeradbiomed.2023.12.044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 12/27/2023] [Accepted: 12/29/2023] [Indexed: 01/03/2024]
Abstract
BACKGROUND AND AIM Sarcoplasmic/endoplasmic reticulum Ca2+ ATPase 2 (SERCA2) is critical in maintaining Ca2+ homeostasis. The cysteine 674 (C674) is the key redox regulatory cysteine in regulating SERCA2 activity, which is irreversibly oxidized in the renal cortex of hypertensive mice. We have reported that the substitution of C674 by serine causes SERCA2 dysfunction and increases blood pressure by induction of endoplasmic reticulum stress (ERS). This study is to explore whether the dysfunction of SERCA2 causes hypertension by interrupting mitochondrial homeostasis and inducing oxidative stress. METHODS & RESULTS We used heterozygous SERCA2 C674S gene mutation knock-in (SKI) mice, where one copy of C674 was substituted by serine to represent partial C674 oxidation. In renal proximal tubule (RPT) cells, the substitution of C674 by serine decreased mitochondrial Ca2+ content, increased mitochondrial membrane potential, ATP content, and reactive oxygen species (ROS), which could be reversed by ERS inhibitor 4-phenylbutyric acid or SERCA2 agonist CDN1163. In SKI RPT cells, the redox modulator Tempol alleviated oxidative stress, downregulated the protein expression of ERS markers and soluble epoxide hydrolase, upregulated the protein expression of dopamine D1 receptor, and reduced Na+/K+- ATPase activity. In SKI mice, SERCA2 agonists CDN1163 and [6]-Gingerol, or the redox modulator Tempol increased urine output and lowered blood pressure. CONCLUSION The irreversible oxidation of C674 is not only an indicator of increased ROS, but also further inducing oxidative stress to cause hypertension. Activation of SERCA2 or inhibition of oxidative stress is beneficial to alleviate hypertension caused by SERCA2 dysfunction.
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Affiliation(s)
- Yaping Wang
- Innovative Drug Research Centre, Chongqing University, Chongqing, 401331, China
| | - Min Wang
- Innovative Drug Research Centre, Chongqing University, Chongqing, 401331, China
| | - Hang Su
- Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou Province, 563006, China
| | - Jiarou Song
- Innovative Drug Research Centre, Chongqing University, Chongqing, 401331, China
| | - Minghua Ren
- Department of Urinary Surgery, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, 150001, China
| | - Pingping Hu
- College of Pharmacy, Chongqing Medical University, Chongqing, 400016, China
| | - Gang Liu
- Henan Key Laboratory of Medical Tissue Regeneration, College of Basic Medical Sciences, Xinxiang Medical University, Xinxiang, Henan Province, 453003, China.
| | - Xiaoyong Tong
- Innovative Drug Research Centre, Chongqing University, Chongqing, 401331, China; Jinfeng Laboratory, Chongqing, 401329, China.
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Nakayama M, Kabayama S, Miyazaki M. Application of Electrolyzed Hydrogen Water for Management of Chronic Kidney Disease and Dialysis Treatment-Perspective View. Antioxidants (Basel) 2024; 13:90. [PMID: 38247514 PMCID: PMC10812465 DOI: 10.3390/antiox13010090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Revised: 01/09/2024] [Accepted: 01/09/2024] [Indexed: 01/23/2024] Open
Abstract
Chronic kidney disease (CKD), which is globally on the rise, has become an urgent challenge from the perspective of public health, given its risk factors such as end-stage renal failure, cardiovascular diseases, and infections. The pathophysiology of CKD, including dialysis patients, is deeply associated with enhanced oxidative stress in both the kidneys and the entire body. Therefore, the introduction of a safe and widely applicable antioxidant therapy is expected as a measure against CKD. Electrolyzed hydrogen water (EHW) generated through the electrolysis of water has been confirmed to possess chemical antioxidant capabilities. In Japan, devices producing this water have become popular for household drinking water. In CKD model experiments conducted to date, drinking EHW has been shown to suppress the progression of kidney damage related to hypertension. Furthermore, clinical studies have reported that systemic oxidative stress in patients undergoing dialysis treatment using EHW is suppressed, leading to a reduction in the incidence of cardiovascular complications. In the future, considering EHW as one of the comprehensive measures against CKD holds significant importance. The medical utility of EHW is believed to be substantial, and further investigation is warranted.
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Affiliation(s)
- Masaaki Nakayama
- Kidney Center, St. Luke’s International Hospital, Tokyo 104-8560, Japan
- Division of Blood Purification, Tohoku University Hospital, Sendai 980-8574, Japan; (S.K.); (M.M.)
| | - Shigeru Kabayama
- Division of Blood Purification, Tohoku University Hospital, Sendai 980-8574, Japan; (S.K.); (M.M.)
- Graduate School of Science, Technology & Innovation, Kobe University, Kobe 657-8501, Japan
- Nihon Trim Co., Ltd., Osaka 530-0001, Japan
| | - Mariko Miyazaki
- Division of Blood Purification, Tohoku University Hospital, Sendai 980-8574, Japan; (S.K.); (M.M.)
- Division of Nephrology, Rheumatology and Endocrinology, Graduate School of Medicine, Tohoku University, Sendai 980-8574, Japan
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Juwita DA, Farinka R, Abdillah R, Rachmaini F. Blood pressure lowering effects of Vernonia amygdalina Del. Aqueous fraction on hypertensive Wistar Kyoto rats. JOURNAL OF COMPLEMENTARY & INTEGRATIVE MEDICINE 2023; 20:740-747. [PMID: 37831720 DOI: 10.1515/jcim-2022-0416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Accepted: 09/20/2023] [Indexed: 10/15/2023]
Abstract
OBJECTIVES Vernonia amygdalina (VA) is a plant that consumed as vegetable by Indonesians contained numerous secondary metabolites. VA's pharmacological action, including its antioxidant properties, anticancer, antidiabetic, and hepatoprotective. The purpose of this research is to reveal the activity of Vernonia amygdalina. leafs aqueous fraction (VALAF) as a blood pressure-lowering agent in hypertensive model. METHODS Combination of prednisone and NaCl were used as hypertensive inducer. The animals were split into five different groups, normal control group treated with distilled water, treatment VALAF groups with dose of 10; 20 and 40 mg/kg BW respectively, while the last group was treated with captopril at dose of 2.25 mg/kg BW. All animals were given an oral treatment for 15 days. On days 5, 10, and 15, systolic and diastolic blood pressure, heart rate (HR), mean arterial pressure (MAP), and blood flow (BF) were all measured. On days 0 and 15, NO level were assessed. All data were analyzed using two-way ANOVA, and Duncan Multiple Range Test. RESULTS The V. amygdalina leaf aqueous fraction has blood pressure lowering activity. The blood pressure parameter of the rats treated with VALAF were lower as compared to the normal control group (p<0.05). NO levels in the VALAF group were not significantly higher than in the normal control group (p>0.05). The VALAF 20 give the greatest percentage of decrease in blood pressure, heart rate and blood volume on the 15th day of examination. CONCLUSIONS These study indicated that V. amygdalina leaf aqueous fraction has the potential to be an alternative therapy for managing blood pressure in hypertensive animal models.
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Affiliation(s)
- Dian Ayu Juwita
- Departement of Pharmacology and Clinical Pharmacy, Faculty of Pharmacy, Universitas Andalas, Padang, Indonesia
| | - Rindang Farinka
- Undergraduate Pharmacy Study Programme, Faculty of Pharmacy, Universitas Andalas, Padang, Indonesia
| | - Rahmad Abdillah
- Departement of Pharmacology and Clinical Pharmacy, Faculty of Pharmacy, Universitas Andalas, Padang, Indonesia
| | - Fitri Rachmaini
- Departement of Pharmacology and Clinical Pharmacy, Faculty of Pharmacy, Universitas Andalas, Padang, Indonesia
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Cheng S, Shan L, You Z, Xia Y, Zhao Y, Zhang H, Zhao Z. Dietary patterns, uric acid levels, and hyperuricemia: a systematic review and meta-analysis. Food Funct 2023; 14:7853-7868. [PMID: 37599588 DOI: 10.1039/d3fo02004e] [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: 08/22/2023]
Abstract
Background: Studies investigating the effects of dietary intake on serum uric acid (SUA) and hyperuricemia have yielded inconsistent results. Therefore, we conducted a meta-analysis to assess the associations between various dietary patterns and SUA levels as well as hyperuricemia. Methods: We searched PubMed, Web of Science, and EMBASE databases for relevant articles examining the association between dietary intake and SUA levels and/or hyperuricemia published until March 2023. Dietary intake patterns were classified into plant-based, animal-based, and mixed dietary patterns based on predominant foods. The pooled effect sizes of eligible studies and their corresponding 95% confidence intervals (CIs) were estimated using random-effects models. Publication bias was assessed using Egger's test. Results: We included 41 studies, comprising 359 317 participants, that investigated the effects of dietary patterns on SUA levels (n = 25) and hyperuricemia (n = 19). Our findings suggested that a plant-based dietary pattern was associated with decreased SUA levels in both interventional (standard mean difference: -0.24 mg dL-1, 95% CI: -0.42, -0.06; I2 = 61.4%) and observational studies (odds ratio (OR): 0.92, 95% CI: 0.89, 0.95, I2 = 91.1%); this association was stronger in men (OR: 0.45, 95% CI: 0.35, 0.58; I2 = 0). We observed that plant- and animal-based dietary patterns were associated with a reduced risk (OR: 0.75; 95% CI: 0.67, 0.83, I2 = 93.3%) and an increased risk (OR: 1.38; 95% CI: 1.20, 1.59, I2 = 88.4%) of hyperuricemia, respectively. Conclusions: Collectively, a plant-based dietary pattern is negatively associated with SUA levels and hyperuricemia. Therefore, a plant-based dietary pattern should be recommended for the management of SUA levels and the prevention of hyperuricemia.
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Affiliation(s)
- Sijie Cheng
- Department of Clinical Epidemiology, Shengjing Hospital of China Medical University, No. 36, San Hao Street, Shenyang, Liaoning, 110004, China.
| | - Lishen Shan
- Department of Pediatrics, Shengjing Hospital of China Medical University, China
| | - Zhuying You
- Department of Clinical Epidemiology, Shengjing Hospital of China Medical University, No. 36, San Hao Street, Shenyang, Liaoning, 110004, China.
| | - Yang Xia
- Department of Clinical Epidemiology, Shengjing Hospital of China Medical University, No. 36, San Hao Street, Shenyang, Liaoning, 110004, China.
| | - Yuhong Zhao
- Department of Clinical Epidemiology, Shengjing Hospital of China Medical University, No. 36, San Hao Street, Shenyang, Liaoning, 110004, China.
- Clinical Research Center, Shengjing Hospital of China Medical University, No. 36, San Hao Street, Shenyang, Liaoning, 110004, China.
- Liaoning Key Laboratory of Precision Medical Research on Major Chronic Disease, Shengjing Hospital of China Medical University, No. 36, San Hao Street, Shenyang, Liaoning, 110004, China
| | - Hehua Zhang
- Clinical Research Center, Shengjing Hospital of China Medical University, No. 36, San Hao Street, Shenyang, Liaoning, 110004, China.
- Liaoning Key Laboratory of Precision Medical Research on Major Chronic Disease, Shengjing Hospital of China Medical University, No. 36, San Hao Street, Shenyang, Liaoning, 110004, China
| | - Zhiying Zhao
- Department of Clinical Epidemiology, Shengjing Hospital of China Medical University, No. 36, San Hao Street, Shenyang, Liaoning, 110004, China.
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Armenia A, Wahyuni FS, Almahdy A, Abdillah R, Aquista PG, Putri DP, Zikra M. Blood pressure and blood sugar-lowering effects of purified gambir on diabetic hypertensive Wistar Kyoto rats. JOURNAL OF COMPLEMENTARY & INTEGRATIVE MEDICINE 2022; 19:627-636. [PMID: 35446514 DOI: 10.1515/jcim-2022-0054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Accepted: 04/05/2022] [Indexed: 11/15/2022]
Abstract
OBJECTIVES Antioxidants protect people from diabetes and its cardiovascular complication. Purified gambir (Uncaria gambir Roxb.) is a potential medicinal plant for treating this condition based on the antioxidant activity of its catechin compound. This study tries to reveal the potential activity of purified gambir as a blood pressure-lowering drug while lowering blood glucose in diabetic hypertensive rats induced by oral NaCl-Prednisone and Alloxan. METHODS Rats were induced by oral NaCl 0.8% and Prednisone 5 mg/kg BW for 14 days to obtain hypertensive condition. Alloxan 125 mg/kg BW was given intra peritoneal injection on the 8th day to obtain diabetic hypertensive condition. The animal was divided into five groups, normal control group treated with vehicle, treatment groups were treated with purified gambir at dose of 2.5; 5 and 10 mg/kg BW respectively, while the positive control group were treated with a combination of captopril-glibenclamide at dose of 2.25 and 0.45 mg/kg BW. All animals were treated orally for 14 days. Fasting blood glucose and cardiovascular parameters (SBP, DBP, MAP, HR, BF and BV) were measured on days 1, 3, 7, and 14. NO level were measured on day 0 and day 14. Data were analyzed using two-way ANOVA followed by Duncan Multiple Range Test. RESULTS The purified gambir has blood pressure and blood sugar-lowering activity (p<0.05). The NO levels of the treatment group also increased significantly (p<0.05). CONCLUSIONS This study indicated that purified gambir could be an alternative medicine to manage blood glucose and blood pressure in the diabetic hypertensive model.
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Affiliation(s)
- Armenia Armenia
- Department of Pharmacology and Clinical Pharmacy, Faculty of Pharmacy, Universitas Andalas, Padang, Indonesia
| | - Fatma Sri Wahyuni
- Department of Pharmacology and Clinical Pharmacy, Faculty of Pharmacy, Universitas Andalas, Padang, Indonesia
| | - Almahdy Almahdy
- Department of Pharmacology and Clinical Pharmacy, Faculty of Pharmacy, Universitas Andalas, Padang, Indonesia
| | - Rahmad Abdillah
- Department of Pharmacology and Clinical Pharmacy, Faculty of Pharmacy, Universitas Andalas, Padang, Indonesia
| | - Popy Genca Aquista
- Undergraduate Pharmacy Study Programme, Faculty of Pharmacy, Universitas Andalas, Padang, Indonesia
| | - Diana Puspita Putri
- Undergraduate Pharmacy Study Programme, Faculty of Pharmacy, Universitas Andalas, Padang, Indonesia
| | - Murhamah Zikra
- Undergraduate Pharmacy Study Programme, Faculty of Pharmacy, Universitas Andalas, Padang, Indonesia
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Oxidative Stress-Induced Hypertension of Developmental Origins: Preventive Aspects of Antioxidant Therapy. Antioxidants (Basel) 2022; 11:antiox11030511. [PMID: 35326161 PMCID: PMC8944751 DOI: 10.3390/antiox11030511] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 03/03/2022] [Accepted: 03/05/2022] [Indexed: 12/14/2022] Open
Abstract
Hypertension remains the leading cause of disease burden worldwide. Hypertension can originate in the early stages of life. A growing body of evidence suggests that oxidative stress, which is characterized as a reactive oxygen species (ROS)/nitric oxide (NO) disequilibrium, has a pivotal role in the hypertension of developmental origins. Results from animal studies support the idea that early-life oxidative stress causes developmental programming in prime blood pressure (BP)-controlled organs such as the brain, kidneys, heart, and blood vessels, leading to hypertension in adult offspring. Conversely, perinatal use of antioxidants can counteract oxidative stress and therefore lower BP. This review discusses the interaction between oxidative stress and developmental programming in hypertension. It will also discuss evidence from animal models, how oxidative stress connects with other core mechanisms, and the potential of antioxidant therapy as a novel preventive strategy to prevent the hypertension of developmental origins.
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Chakraborty K, Paulose SK. Marginolides A-B, polyether macrolide analogues from veined octopus Amphioctopus marginatus: anti-hypertensive leads attenuate angiotensin-converting enzyme. Nat Prod Res 2021; 36:5688-5700. [PMID: 34927480 DOI: 10.1080/14786419.2021.2013841] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Angiotensin-I-converting enzyme (ACE) is considered as a major drug target for the treatment of hypertension as it catalyses the production of vasoconstrictor angiotensin II from angiotensin I. ACE inhibitor agents are an effective therapeutic strategy to control high blood pressure. Unprecedented polyether macrolides, marginolide A and B were isolated from the crude extract of marine octopus, Amphioctopus marginatus via bioassay-directed sequential chromatographic fractionation. Marginolide A displayed considerably greater ACE attenuation potential (IC50 0.58 mM) than that exhibited by marginolide B (IC50 0.72 mM). Higher antioxidant properties of marginolide A against the oxidant species (IC50 ∼ 1 mM) also supported its potential ACE inhibitory activity. Higher polar characteristics along with acceptable hydrophobic-hydrophilic equilibrium (partition coefficient of octanol-water, log Pow 2-4) revealed the potential anti-hypertensive activities of marginolides. This study recognized the anti-hypertensive properties of marginolides as promising pharmaceutical leads.
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Affiliation(s)
- Kajal Chakraborty
- Bioprospecting Section of Marine Biotechnology Division, Central Marine Fisheries Research Institute, Cochin, Kerala, India
| | - Silpa Kunnappilly Paulose
- Bioprospecting Section of Marine Biotechnology Division, Central Marine Fisheries Research Institute, Cochin, Kerala, India.,Department of Chemistry, Mangalore University, Mangalagangothri, Karnataka, India
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Finger Millet Ethanol Extracts Prevent Hypertension by Inhibiting the Angiotensin-Converting Enzyme Level and Enhancing the Antioxidant Capacity in Spontaneously Hypertensive Rats. Antioxidants (Basel) 2021; 10:antiox10111766. [PMID: 34829637 PMCID: PMC8614972 DOI: 10.3390/antiox10111766] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 11/02/2021] [Accepted: 11/02/2021] [Indexed: 11/17/2022] Open
Abstract
Finger millet (Eleusine coracana) contains high levels of calcium and polyphenols, which have a variety of beneficial functions. We tested the hypothesis that finger millet ethanol extracts (FEs) have an antihypertensive effect in spontaneously hypertensive rats (SHRs). The study groups were assigned as follows: (1) Wistar Kyoto rats (normal); (2) SHRs treated with saline (negative control); (3) SHRs treated with captopril 50 mg/kg bw (positive control); (4) SHRs treated with FE 250 mg/kg bw (FE250); and (5) SHRs treated with FE 500 mg/kg bw (FE500). FE supplementation improved the lipid profiles, including the triglyceride, total cholesterol, and low-density lipoprotein cholesterol levels, without deterioration in liver function. The thiobarbituric acid reactive substance concentration and superoxide dismutase activity significantly improved after the application of FE250 and FE500. Interestingly, FE250 and FE500 application dramatically reduced the systolic blood pressure. FE supplementation exhibited powerful control over the renin-angiotensin system by reducing the angiotensin-converting enzyme levels and renin mRNA expression in the kidney. Additionally, FE500 application ameliorated vascular remodeling, reversed the thickening media, and decreased the media thickness/lumen diameter ratio of the aorta. These results imply that FEs are a potent antihypertensive nutraceutical for regulating the renin-angiotensin system and simultaneously inhibiting oxidative stress.
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Potter JC, Whiles SA, Miles CB, Whiles JB, Mitchell MA, Biederman BE, Dawoud FM, Breuel KF, Williamson GA, Picken MM, Polichnowski AJ. Salt-Sensitive Hypertension, Renal Injury, and Renal Vasodysfunction Associated With Dahl Salt-Sensitive Rats Are Abolished in Consomic SS.BN1 Rats. J Am Heart Assoc 2021; 10:e020261. [PMID: 34689582 PMCID: PMC8751849 DOI: 10.1161/jaha.120.020261] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Background Abnormal renal hemodynamic responses to salt‐loading are thought to contribute to salt‐sensitive (SS) hypertension. However, this is based largely on studies in anesthetized animals, and little data are available in conscious SS and salt‐resistant rats. Methods and Results We assessed arterial blood pressure, renal function, and renal blood flow during administration of a 0.4% NaCl and a high‐salt (4.0% NaCl) diet in conscious, chronically instrumented 10‐ to 14‐week‐old Dahl SS and consomic SS rats in which chromosome 1 from the salt‐resistant Brown‐Norway strain was introgressed into the genome of the SS strain (SS.BN1). Three weeks of high salt intake significantly increased blood pressure (20%) and exacerbated renal injury in SS rats. In contrast, the increase in blood pressure (5%) was similarly attenuated in Brown‐Norway and SS.BN1 rats, and both strains were completely protected against renal injury. In SS.BN1 rats, 1 week of high salt intake was associated with a significant decrease in renal vascular resistance (−8%) and increase in renal blood flow (15%). In contrast, renal vascular resistance failed to decrease, and renal blood flow remained unchanged in SS rats during high salt intake. Finally, urinary sodium excretion and glomerular filtration rate were similar between SS and SS.BN1 rats during 0.4% NaCl and high salt intake. Conclusions Our data support the concept that renal vasodysfunction contributes to blood pressure salt sensitivity in Dahl SS rats, and that genes on rat chromosome 1 play a major role in modulating renal hemodynamic responses to salt loading and salt‐induced hypertension.
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Affiliation(s)
- Jacqueline C Potter
- Department of Biomedical Sciences Quillen College of MedicineEast Tennessee State University Johnson City TN
| | - Shannon A Whiles
- Department of Biomedical Sciences Quillen College of MedicineEast Tennessee State University Johnson City TN
| | - Conor B Miles
- Department of Biomedical Sciences Quillen College of MedicineEast Tennessee State University Johnson City TN
| | - Jenna B Whiles
- Department of Biomedical Sciences Quillen College of MedicineEast Tennessee State University Johnson City TN
| | - Mark A Mitchell
- Department of Biomedical Sciences Quillen College of MedicineEast Tennessee State University Johnson City TN
| | - Brianna E Biederman
- Department of Biomedical Sciences Quillen College of MedicineEast Tennessee State University Johnson City TN
| | - Febronia M Dawoud
- Department of Biomedical Sciences Quillen College of MedicineEast Tennessee State University Johnson City TN
| | - Kevin F Breuel
- Department of Obstetrics and Gynecology Quillen College of MedicineEast Tennessee State University Johnson City TN
| | - Geoffrey A Williamson
- Department of Electrical and Computer Engineering Illinois Institute of Technology Chicago IL
| | - Maria M Picken
- Department of Pathology Loyola University Medical Center Maywood IL
| | - Aaron J Polichnowski
- Department of Biomedical Sciences Quillen College of MedicineEast Tennessee State University Johnson City TN.,Center of Excellence in Inflammation, Infectious Disease and Immunity East Tennessee State University Johnson City TN
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Martinelli I, Tomassoni D, Roy P, Di Cesare Mannelli L, Amenta F, Tayebati SK. Antioxidant Properties of Alpha-Lipoic (Thioctic) Acid Treatment on Renal and Heart Parenchyma in a Rat Model of Hypertension. Antioxidants (Basel) 2021; 10:antiox10071006. [PMID: 34201726 PMCID: PMC8300705 DOI: 10.3390/antiox10071006] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Revised: 06/16/2021] [Accepted: 06/17/2021] [Indexed: 01/01/2023] Open
Abstract
Renal and cardiac impairments are frequent events in the presence of hypertension. Organ damage is mainly linked to oxidative stress due to high blood pressure and may be reduced by antioxidant supplementation. Alpha-lipoic acid (ALA) is one of most effective antioxidants. It is widely used as a nutritional supplement in a racemic mixture (+/–), even though the (+)-enantiomer is biologically active. This study was designed to investigate the effect of treatment with (+/–)-ALA and its enantiomers on renal and heart parenchyma in spontaneously hypertensive rats (SHR), using immunochemical and immunohistochemical techniques. The results confirmed that the oxidative mechanisms of organ alterations, due to hypertension, and characterized by glomerular and tubular lesions, left ventricular hypertrophy, and fibrosis but not by apoptosis were accompanied by proteins’ and nucleic acids’ oxidation. We found greater effectiveness of (+)-ALA compared to (+/−)-ALA in reducing oxidative stress, cardiac and renal damages in SHR. To conclude, these data propose (+)-ALA as one of the more appropriate antioxidant molecules to prevent renal and cardiac alterations associated with hypertension.
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Affiliation(s)
- Ilenia Martinelli
- School of Pharmacy, University of Camerino, 62032 Camerino, Italy; (I.M.); (F.A.)
| | - Daniele Tomassoni
- School of Biosciences and Veterinary Medicine, University of Camerino, 62032 Camerino, Italy; (D.T.); (P.R.)
| | - Proshanta Roy
- School of Biosciences and Veterinary Medicine, University of Camerino, 62032 Camerino, Italy; (D.T.); (P.R.)
| | - Lorenzo Di Cesare Mannelli
- Department of Neuroscience, Pharmaceutical and Child Health Area (NEUROFARBA), University of Florence, 50139 Florence, Italy;
| | - Francesco Amenta
- School of Pharmacy, University of Camerino, 62032 Camerino, Italy; (I.M.); (F.A.)
| | - Seyed Khosrow Tayebati
- School of Pharmacy, University of Camerino, 62032 Camerino, Italy; (I.M.); (F.A.)
- Correspondence:
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Düsing P, Zietzer A, Goody PR, Hosen MR, Kurts C, Nickenig G, Jansen F. Vascular pathologies in chronic kidney disease: pathophysiological mechanisms and novel therapeutic approaches. J Mol Med (Berl) 2021; 99:335-348. [PMID: 33481059 PMCID: PMC7900031 DOI: 10.1007/s00109-021-02037-7] [Citation(s) in RCA: 76] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 12/14/2020] [Accepted: 01/05/2021] [Indexed: 12/13/2022]
Abstract
Cardiovascular disease (CVD) is a major cause of death in patients with chronic kidney disease (CKD). Both conditions are rising in incidence as well as prevalence, creating poor outcomes for patients and high healthcare costs. Recent data suggests CKD to be an independent risk factor for CVD. Accumulation of uremic toxins, chronic inflammation, and oxidative stress have been identified to act as CKD-specific alterations that increase cardiovascular risk. The association between CKD and cardiovascular mortality is markedly influenced through vascular alterations, in particular atherosclerosis and vascular calcification (VC). While numerous risk factors promote atherosclerosis by inducing endothelial dysfunction and its progress to vascular structural damage, CKD affects the medial layer of blood vessels primarily through VC. Ongoing research has identified VC to be a multifactorial, cell-mediated process in which numerous abnormalities like mineral dysregulation and especially hyperphosphatemia induce a phenotype switch of vascular smooth muscle cells to osteoblast-like cells. A combination of pro-calcifying stimuli and an impairment of inhibiting mechanisms like fetuin A and vitamin K-dependent proteins like matrix Gla protein and Gla-rich protein leads to mineralization of the extracellular matrix. In view of recent studies, intercellular communication pathways via extracellular vesicles and microRNAs represent key mechanisms in VC and thereby a promising field to a deeper understanding of the involved pathomechanisms. In this review, we provide an overview about pathophysiological mechanisms connecting CKD and CVD. Special emphasis is laid on vascular alterations and more recently discovered molecular pathways which present possible new therapeutic targets.
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Affiliation(s)
- Philip Düsing
- Heart Center, Department of Medicine II, University Hospital Bonn, University of Bonn, Venusberg-Campus 1, 53127, Bonn, Germany
| | - Andreas Zietzer
- Heart Center, Department of Medicine II, University Hospital Bonn, University of Bonn, Venusberg-Campus 1, 53127, Bonn, Germany
| | - Philip Roger Goody
- Heart Center, Department of Medicine II, University Hospital Bonn, University of Bonn, Venusberg-Campus 1, 53127, Bonn, Germany
| | - Mohammed Rabiul Hosen
- Heart Center, Department of Medicine II, University Hospital Bonn, University of Bonn, Venusberg-Campus 1, 53127, Bonn, Germany
| | - Christian Kurts
- Institute of Experimental Immunology, University Hospital Bonn, University of Bonn, Venusberg-Campus 1, Bonn, 53127, Germany
| | - Georg Nickenig
- Heart Center, Department of Medicine II, University Hospital Bonn, University of Bonn, Venusberg-Campus 1, 53127, Bonn, Germany
| | - Felix Jansen
- Heart Center, Department of Medicine II, University Hospital Bonn, University of Bonn, Venusberg-Campus 1, 53127, Bonn, Germany.
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Gohar EY, Almutlaq RN, Daugherty EM, Butt MK, Jin C, Pollock JS, Pollock DM, De Miguel C. Activation of G protein-coupled estrogen receptor 1 ameliorates proximal tubular injury and proteinuria in Dahl salt-sensitive female rats. Am J Physiol Regul Integr Comp Physiol 2021; 320:R297-R306. [PMID: 33407017 PMCID: PMC7988769 DOI: 10.1152/ajpregu.00267.2020] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 12/21/2020] [Accepted: 12/21/2020] [Indexed: 01/02/2023]
Abstract
Recent evidence indicates a crucial role for G protein-coupled estrogen receptor 1 (GPER1) in the maintenance of cardiovascular and kidney health in females. The current study tested whether GPER1 activation ameliorates hypertension and kidney damage in female Dahl salt-sensitive (SS) rats fed a high-salt (HS) diet. Adult female rats were implanted with telemetry transmitters for monitoring blood pressure and osmotic minipumps releasing G1 (selective GPER1 agonist, 400 μg/kg/day ip) or vehicle. Two weeks after pump implantation, rats were shifted from a normal-salt (NS) diet (0.4% NaCl) to a matched HS diet (4.0% NaCl) for 2 wk. Twenty-four hour urine samples were collected during both diet periods and urinary markers of kidney injury were assessed. Histological assessment of kidney injury was conducted after the 2-wk HS diet period. Compared with values during the NS diet, 24-h mean arterial pressure markedly increased in response to HS, reaching similar values in vehicle-treated and G1-treated rats. HS also significantly increased urinary excretion of protein, albumin, nephrin (podocyte damage marker), and KIM-1 (proximal tubule injury marker) in vehicle-treated rats. Importantly, G1 treatment prevented the HS-induced proteinuria, albuminuria, and increase in KIM-1 excretion but not nephrinuria. Histological analysis revealed that HS-induced glomerular damage did not differ between groups. However, G1 treatment preserved proximal tubule brush-border integrity in HS-fed rats. Collectively, our data suggest that GPER1 activation protects against HS-induced proteinuria and albuminuria in female Dahl SS rats by preserving proximal tubule brush-border integrity in a blood pressure-independent manner.
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Affiliation(s)
- Eman Y Gohar
- Cardio-Renal Physiology and Medicine Section, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Rawan N Almutlaq
- Cardio-Renal Physiology and Medicine Section, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Elizabeth M Daugherty
- Cardio-Renal Physiology and Medicine Section, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Maryam K Butt
- Cardio-Renal Physiology and Medicine Section, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Chunhua Jin
- Cardio-Renal Physiology and Medicine Section, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Jennifer S Pollock
- Cardio-Renal Physiology and Medicine Section, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - David M Pollock
- Cardio-Renal Physiology and Medicine Section, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Carmen De Miguel
- Cardio-Renal Physiology and Medicine Section, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
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Uddin MJ, Kim EH, Hannan MA, Ha H. Pharmacotherapy against Oxidative Stress in Chronic Kidney Disease: Promising Small Molecule Natural Products Targeting Nrf2-HO-1 Signaling. Antioxidants (Basel) 2021; 10:antiox10020258. [PMID: 33562389 PMCID: PMC7915495 DOI: 10.3390/antiox10020258] [Citation(s) in RCA: 45] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2021] [Revised: 02/01/2021] [Accepted: 02/03/2021] [Indexed: 12/16/2022] Open
Abstract
The global burden of chronic kidney disease (CKD) intertwined with cardiovascular disease has become a major health problem. Oxidative stress (OS) plays an important role in the pathophysiology of CKD. The nuclear factor erythroid 2-related factor 2 (Nrf2)-antioxidant responsive element (ARE) antioxidant system plays a critical role in kidney protection by regulating antioxidants during OS. Heme oxygenase-1 (HO-1), one of the targets of Nrf2-ARE, plays an important role in regulating OS and is protective in a variety of human and animal models of kidney disease. Thus, activation of Nrf2-HO-1 signaling may offer a potential approach to the design of novel therapeutic agents for kidney diseases. In this review, we have discussed the association between OS and the pathogenesis of CKD. We propose Nrf2-HO-1 signaling-mediated cell survival systems be explored as pharmacological targets for the treatment of CKD and have reviewed the literature on the beneficial effects of small molecule natural products that may provide protection against CKD.
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Affiliation(s)
- Md Jamal Uddin
- Graduate School of Pharmaceutical Sciences, College of Pharmacy, Ewha Womans University, Seoul 03760, Korea; (M.J.U.); (E.H.K.)
- ABEx Bio-Research Center, East Azampur, Dhaka 1230, Bangladesh;
| | - Ee Hyun Kim
- Graduate School of Pharmaceutical Sciences, College of Pharmacy, Ewha Womans University, Seoul 03760, Korea; (M.J.U.); (E.H.K.)
| | - Md. Abdul Hannan
- ABEx Bio-Research Center, East Azampur, Dhaka 1230, Bangladesh;
- Department of Biochemistry and Molecular Biology, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
| | - Hunjoo Ha
- Graduate School of Pharmaceutical Sciences, College of Pharmacy, Ewha Womans University, Seoul 03760, Korea; (M.J.U.); (E.H.K.)
- Correspondence: ; Tel.: +82-2-3277-4075
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Srivastava A, Schmidt IM, Palsson R, Weins A, Bonventre JV, Sabbisetti V, Stillman IE, Rennke HG, Waikar SS. The Associations of Plasma Biomarkers of Inflammation With Histopathologic Lesions, Kidney Disease Progression, and Mortality-The Boston Kidney Biopsy Cohort Study. Kidney Int Rep 2021; 6:685-694. [PMID: 33732983 PMCID: PMC7938082 DOI: 10.1016/j.ekir.2020.12.025] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 11/20/2020] [Accepted: 12/22/2020] [Indexed: 12/18/2022] Open
Abstract
Background Soluble tumor necrosis factor receptor (sTNFR)-1, sTNFR-2, YKL-40, monocyte chemoattractant protein (MCP)-1, and soluble urokinase plasminogen activator receptor (suPAR) have emerged as promising biomarkers of inflammation but have not been evaluated across diverse types of kidney diseases. Methods We measured these plasma biomarkers in 523 individuals enrolled into a prospective, observational cohort study of patients undergoing clinically indicated native kidney biopsy at 3 tertiary care hospitals. Two kidney pathologists adjudicated biopsy specimens for semiquantitative scores of histopathology. Proportional hazard models tested associations between biomarkers and risks of kidney disease progression (composite of ≥40% estimated glomerular filtration rate [eGFR] decline or end-stage kidney disease [ESKD]) and death. Results Mean eGFR was 56.4±36 ml/min per 1.73 m2 and the median proteinuria (interquartile range) was 1.6 (0.4, 3.9) g/g creatinine. The most common primary clinicopathologic diagnoses were proliferative glomerulonephritis (29.2%), nonproliferative glomerulopathy (18.1%), advanced glomerulosclerosis (11.3%), and diabetic kidney disease (11.1%). sTNFR-1, sTNFR-2, MCP-1, and suPAR were associated with tubulointerstitial and glomerular lesions. YKL-40 was not associated with any histopathologic lesions after multivariable adjustment. During a median follow-up of 65 months, 182 participants suffered kidney disease progression and 85 participants died. After multivariable adjustment, each doubling of sTNFR-1, sTNFR-2, YKL-40, and MCP-1 was associated with increased risks of kidney disease progression, with hazard ratios ranging from 1.21 to 1.47. Each doubling of sTNFR-2, YKL-40, and MCP-1 was associated with increased risks of death, with hazard ratios ranging from 1.33 to 1.45. suPAR was not significantly associated with kidney disease progression or death. Conclusions sTNFR-1, sTNFR-2, YKL-40, MCP-1, and suPAR are associated with underlying histopathologic lesions and adverse clinical outcomes across a diverse set of kidney diseases.
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Affiliation(s)
- Anand Srivastava
- Center for Translational Metabolism and Health, Institute for Public Health and Medicine, Division of Nephrology and Hypertension, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - Insa M. Schmidt
- Section of Nephrology, Boston University School of Medicine and Boston Medical Center, Boston, Massachusetts, USA
- Renal Division, Brigham & Women’s Hospital, Boston, Massachusetts, USA
| | - Ragnar Palsson
- Renal Division, Brigham & Women’s Hospital, Boston, Massachusetts, USA
- Division of Nephrology, Landspitali–The National University Hospital of Iceland, Faculty of Medicine, School of Health Sciences, University of Iceland, Reykjavik, Iceland
| | - Astrid Weins
- Pathology Department, Brigham & Women’s Hospital, Boston, Massachusetts, USA
| | | | | | - Isaac E. Stillman
- Department of Pathology, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA
| | - Helmut G. Rennke
- Pathology Department, Brigham & Women’s Hospital, Boston, Massachusetts, USA
| | - Sushrut S. Waikar
- Section of Nephrology, Boston University School of Medicine and Boston Medical Center, Boston, Massachusetts, USA
- Renal Division, Brigham & Women’s Hospital, Boston, Massachusetts, USA
- Correspondence: Sushrut S. Waikar, Evans Biomedical Research Center, 650 Albany St, X504, Boston, Massachusetts 02118, USA.
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Santa-Helena E, Cabrera DDC, D'Oca MGM, Scaini JLR, de Oliveira MWB, Werhli AV, Machado KDS, Gonçalves CAN, Nery LEM. Long-chain fatty dihydropyridines: Docking calcium channel studies and antihypertensive activity. Life Sci 2020; 259:118210. [PMID: 32763289 DOI: 10.1016/j.lfs.2020.118210] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Revised: 07/01/2020] [Accepted: 08/02/2020] [Indexed: 01/13/2023]
Abstract
AIMS From the synthesis of 43 lipophilic dihydropyridines, the aim of this study was to verify whether the new dihydropyridines have calcium channel affinity using coupling studies and to determine antihypertensive and antioxidant properties, as well as toxicology and toxicity nifedipine and three new compounds, were chosen from the previous results. MATERIALS AND METHODS The animals were treated for 56 days, 28 days with N (ω) -nitro-L-arginine methyl ester to induce hypertension, and then treated for another 28 days with the new di- hydropyridine and the standard drug nifedipine. Throughout the treatment the animals had their blood pressure measured and their heart rate checked by pletysmography. After treatment the animals were euthanised, blood samples were collected for creatine kinase and urea analysis, and the brain, heart and liver were collected for oxidative status analysis (quantification of reactive oxygen species, total antioxidant capacity, and lipid peroxidation). KEY FINDINGS Compounds 2c, and 9a, and nifedipine significantly reduced blood pressure to control group levels. The tachycardia caused by the induction of hypertension was reversed by 2c and 9a compounds. Regarding oxidative stress analyzes, the compounds that had the best performances were also 2c and 9a. Overall the results demonstrate that two of the three new dihydropyridines tested demonstrated performance equal to or superior to the standard drug nifedipine. SIGNIFICANCE In this study, for the first time, docking was applied to analyse 43 fatty dihydropyridines regarding their calcium channel binding. Afterwards, three fatty dihydropyridines were chosen and their antihypertensive and antioxidant properties.
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Affiliation(s)
- Eduarda Santa-Helena
- Postgraduate Program in Physiological Sciences, Institute of Biological Sciences, Federal University of Rio Grande - FURG, Rio Grande, RS, Brazil; Institute of Biological Sciences, Federal University of Rio Grande - FURG, Rio Grande, RS, Brazil
| | | | | | | | | | | | | | - Carla Amorim Neves Gonçalves
- Postgraduate Program in Physiological Sciences, Institute of Biological Sciences, Federal University of Rio Grande - FURG, Rio Grande, RS, Brazil; Institute of Biological Sciences, Federal University of Rio Grande - FURG, Rio Grande, RS, Brazil
| | - Luiz Eduardo Maia Nery
- Postgraduate Program in Physiological Sciences, Institute of Biological Sciences, Federal University of Rio Grande - FURG, Rio Grande, RS, Brazil; Institute of Biological Sciences, Federal University of Rio Grande - FURG, Rio Grande, RS, Brazil.
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Mehrvar S, Foomani FH, Shimada S, Yang C, Zheleznova NN, Mostaghimi S, Cowley AW, Ranji M. The early effects of uninephrectomy on rat kidney metabolic state using optical imaging. JOURNAL OF BIOPHOTONICS 2020; 13:e202000089. [PMID: 32436651 DOI: 10.1002/jbio.202000089] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 05/13/2020] [Accepted: 05/14/2020] [Indexed: 05/09/2023]
Abstract
Uninephrectomy (UNX) is known to result in structural and metabolic changes to the remaining kidney, although it is uncertain if this alters the mitochondrial redox state and how soon such changes may occur. A custom-designed fluorescence cryo-imaging technique was used to quantitatively assess the effect of UNX by measuring the levels of nicotinamide adenine dinucleotide (NADH) and flavin adenine dinucleotide (FAD) in the remaining kidney. Kidneys were snap-frozen 3 days following UNX, and the intrinsic fluorescence of NADH and FAD were optically acquired. The 3D images were created to characterize the NADH/FAD redox ratios (RR) of the right kidneys, which underwent UNX and the remaining kidneys 3 days following UNX. Both the NADPH-oxidases (Nox2 and Nox4) and the mitochondria are the main sources of reactive oxygen species (ROS) production in tubular epithelial cells. Responses to the UNX were obtained in kidneys of normal Sprague Dawley (SD) rats, Dahl salt-sensitive (SS) rats and SS rats in which NADPH-oxidase isoform 4 (Nox4) was knocked out (SSNox4-/- ). The results found that each of the strains exhibited similar increase in kidney weights averaging 17% after 3 days of UNX. SD and SSNox4-/- rats both exhibited global reductions of the RR (P < .05) with a similar tendency observed in SS rats (P < .08), indicating increased ROS production. The unexpected reduction of the RR in the remnant kidneys of SSNox4-/- rats indicates that mechanisms independent of H2 O2 produced from Nox4 may be responsible for this global increase of ROS. We propose that the reduced RR was largely a consequence of enhanced mitochondrial bioenergetics due to increased tubular workload of the remaining kidney. The data indicate that mitochondria become the dominant source of increased ROS following UNX and could represent an important hypertrophic signaling mechanism.
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Affiliation(s)
- Shima Mehrvar
- Biophotonics Lab, Department of Electrical Engineering, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin, USA
| | - Farnaz H Foomani
- Biophotonics Lab, Department of Electrical Engineering, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin, USA
| | - Satoshi Shimada
- Department of Physiology, Medical College of Wisconsin, Wauwatosa, Wisconsin, USA
| | - Chun Yang
- Department of Physiology, Medical College of Wisconsin, Wauwatosa, Wisconsin, USA
| | | | - Soudeh Mostaghimi
- Biophotonics Lab, Department of Electrical Engineering, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin, USA
| | - Allen W Cowley
- Department of Physiology, Medical College of Wisconsin, Wauwatosa, Wisconsin, USA
| | - Mahsa Ranji
- Biophotonics Lab, Department of Electrical Engineering, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin, USA
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Zhu XL, Zhang T, Xu ZQ, Ma XC, Wang ZJ, Zou CW, Li JX, Jing HY. High salt-induced weakness of anti-oxidative function of natriuretic peptide receptor-C and podocyte damage in the kidneys of Dahl rats. Chin Med J (Engl) 2020; 133:1182-1191. [PMID: 32433050 PMCID: PMC7249711 DOI: 10.1097/cm9.0000000000000752] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND Atrial natriuretic peptide (ANP) and its natriuretic peptide receptors A (NPR-A) and C (NPR-C) are involved in the regulation of physiological and pathophysiological process of blood pressure. The present study aimed to determine the role of NPR-C in the development of salt-sensitive hypertension. METHODS The Dahl salt-sensitive (DS) and salt-resistant (DR) rats were used in this study. Animals were matched according to their age and weight, and then placed on either a high-salt (HS, 8%) or a normal-salt (NS, 0.4%) diet for 6 weeks randomly using random number table. The systolic blood pressure (SBP), plasmatic sodium concentration (PLNa), urinary sodium excretion (UVNa), and serum creatinine concentration (Scr) were measured. The concentration of ANP in blood and tissues (heart and kidney) was detected by enzyme-linked immunosorbent assay. The expression of ANP, NPR-A, and NPR-C in kidney was evaluated with western blot analysis. Regarding renal redox state, the concentration changes in malondialdehyde (MDA), lipofuscin, nicotinamide adenine dinucleotide phosphate (NADPH) oxidase (Nox), and nitric oxide synthase (NOS) in kidney were detected by a spectrophotometric method. The kidney damage was evaluated using pathological techniques and the succinodehydrogenase (SDHase) examination. Furthermore, after an intra-peritoneal injection of C-atrial natriuretic peptide (ANP)4-23 (C-ANP4-23), an NPR-C receptor agonist, the SBP, biochemical values in blood and urine, and renal redox state were evaluated. The paired Student's t test and analysis of variance followed by the Bonferroni test were performed for statistical analyses of the comparisons between two groups and multiple groups, respectively. RESULTS The baseline SBP in all groups was within the normal range. At the end of the 6-week experiment, HS diet significantly increased the SBP in DS rats from 116.63 ± 2.90 mmHg to 162.25 ± 2.15 mmHg (t = -10.213, P < 0.001). The changes of SBP were not significant in DS rats on an NS diet and DR rats on an NS diet or on an HS diet (all P > 0.05). The significant increase of PLNa, UVNa, and Scr related to an HS diet was found in both DS and DR rats (all P < 0.05). However, significant changes in the concentration (t = -21.915, P < 0.001) and expression of renal ANP (t = -3.566, P = 0.016) and the expression of renal NPR-C (t = 5.864, P = 0.002) were only observed in DS hypertensive rats. The significantly higher desmin immunochemical staining score (t = -5.715, P = 0.005) and mitochondrial injury score (t = -6.325, P = 0.003) accompanied by the lower SDHase concentration (t = 3.972, P = 0.017) revealed mitochondrial pathologic abnormalities in podocytes in DS rats with an HS diet. The distinct increases of MDA (t = -4.685, P = 0.009), lipofuscin (t = -8.195, P = 0.001), and Nox (t = -12.733, P < 0.001) but not NOS (t = -0.328, P = 0.764) in kidneys were also found in DS hypertensive rats. C-ANP4-23 treatment significantly decreased the SBP induced by HS in DS rats (P < 0.05), which was still higher than NS groups with the vehicle or C-ANP4-23 treatment (P < 0.05). Moreover, the HS-induced increase of MDA, lipofuscin, Nox concentrations, and Nox4 expression in DS rats was significantly attenuated by C-ANP4-23 treatment as compared with those with HS diet and vehicle injection (all P < 0.05). CONCLUSIONS The results indicated that the renal NPR-C might be involved in the salt-sensitive hypertension through the damage of mitochondria in podocytes and the reduction of the anti-oxidative function. Hence, C-ANP4-23 might serve as a therapeutic agent in treating salt-sensitive hypertension.
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Affiliation(s)
- Xiao-Long Zhu
- Department of Cardiovascular Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, China
| | - Tao Zhang
- Department of Cardiovascular Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, China
| | - Zhen-Qiang Xu
- Department of Cardiovascular Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, China
| | - Xiao-Chun Ma
- Department of Cardiovascular Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, China
| | - Zheng-Jun Wang
- Department of Cardiovascular Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, China
| | - Cheng-Wei Zou
- Department of Cardiovascular Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, China
| | - Jing-Xin Li
- Department of Physiology, Medical School of Shandong University, Jinan, Shandong 250021, China
| | - Hai-Yan Jing
- Department of Pathology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, China
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Exercise training delays renal disorders with decreasing oxidative stress and increasing production of 20-hydroxyeicosatetraenoic acid in Dahl salt-sensitive rats. J Hypertens 2020; 38:1336-1346. [PMID: 32205560 DOI: 10.1097/hjh.0000000000002409] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
OBJECTIVE Exercise training has antihypertensive and renoprotective effects in humans and rats. However, the effects of exercise training on renal disorders that occur with salt-sensitive hypertension remains unclear. The study aim was to investigate the effects and mechanisms of exercise training on renal function in a rat model of salt-sensitive hypertension. METHODS Six-week-old male Dahl salt-sensitive rats were divided into normal-salt (0.6% NaCl) diet, high-salt (8% NaCl) diet, and high-salt diet with exercise training groups. The high-salt diet with exercise training group underwent daily treadmill running for 8 weeks. RESULTS The high-salt diet induced severe hypertension and renal dysfunction. Exercise training significantly improved high-salt diet-induced urinary protein, albumin, and L-type fatty acid-binding protein excretion, and glomerulosclerosis but not renal interstitial fibrosis without changing blood pressure. Exercise training significantly attenuated high-salt diet-induced oxidative stress in the kidneys and decreased high-salt diet-stimulated xanthine oxidoreductase activity but not nicotinamide adenine dinucleotide phosphate oxidase activity. The high-salt diet did not change urinary excretion of 20-hydroxyeicosatetraenoic acid and decreased cytochrome P450 4A protein expression in the kidneys. Exercise training increased urinary 20-hydoroxyeicosatetraenoic acid excretion and renal cytochrome P450 4A protein expression. CONCLUSION Exercise training improved renal disorders without lowering blood pressure in Dahl salt-sensitive rats. Exercise training also decreased oxidative stress and increased 20-hydroxyeicosatetraenoic acid production in the kidneys. These results suggest that improvements in oxidative stress and 20-hydroxyeicosatetraenoic acid production may be potential mechanisms by which exercise training improved renal disorders in Dahl salt-sensitive rats.
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Preventive Beneficial Effect of an Aqueous Extract of Phyllanthus amarus Schum. and Thonn. (Euphorbiaceae) on DOCA-Salt-Induced Hypertension, Cardiac Hypertrophy and Dysfunction, and Endothelial Dysfunction in Rats. J Cardiovasc Pharmacol 2020; 75:573-583. [PMID: 32187164 DOI: 10.1097/fjc.0000000000000825] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
This study investigated the preventive effect of an aqueous extract of the whole plant of Phyllanthus amarus (AEPA) on blood pressure, cardiac, and endothelial function in the deoxycorticosterone acetate (DOCA) salt-induced hypertensive rat model. Male Wistar rats were assigned into 5 groups receiving either vehicle (control and DOCA salt), DOCA salt combined with AEPA at 100 or 300 mg/kg, or AEPA (100 mg/kg) alone for 5 weeks. In addition, DOCA salt-treated rats were allowed free access to water containing 1% NaCl. Systolic blood pressure, left ventricle parameters, vascular reactivity of primary mesenteric artery rings, the vascular level of oxidative stress, and the level of target proteins were determined, using respectively tail-cuff sphygmomanometry, echocardiography, organ chambers, dihydroethidium staining, and immunofluorescence methods. After 5 weeks, AEPA treatments (100 or 300 mg/kg per day) significantly prevented the increase in systolic blood pressure in DOCA salt-treated rats, respectively, by about 24 and 21 mm Hg, improved cardiac diastolic function, and reduced significantly the increased posterior and septum diastolic wall thickness and the left ventricle mass in hypertensive rats. Moreover, the DOCA salt-induced endothelial dysfunction and the blunted nitric oxide- and endothelium-dependent hyperpolarization-mediated relaxations in primary mesenteric artery were improved after the AEPA treatments. AEPA also reduced the level of vascular oxidative stress and the expression level of target proteins (eNOS, COX-2, NADPH oxidase subunit p22) in DOCA salt rats. Altogether, AEPA prevented hypertension, improved cardiac structure and function, and improved endothelial function in DOCA salt rats. Such beneficial effects seem to be related, at least in part, to normalization of the vascular level of oxidative stress.
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Kumar V, Yang C, Cowley AW. Temporal Expression and Cellular Localization of PAPPA2 in the Developing Kidney of Rat. J Histochem Cytochem 2020; 68:209-222. [PMID: 31989854 DOI: 10.1369/0022155420904478] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
PAPPA2 is a metalloproteinase which cleaves insulin-like growth factor binding protein (IGFBP)-3 and IGFBP-5, and its role in pregnancy and postnatal growth is primarily studied. Using exclusion mapping, we reported a subcongenic (26-P) rat where a 0.71-Mbp region containing the pregnancy-associated plasma protein a2 (Pappa2) allele of salt-insensitive Brown Norway (BN) was introgressed into Dahl saltsensitive (SS) genetic background, resulting in the reduction of salt sensitivity. Pappa2 was differentially expressed in the adult kidney of 26-P and SS rats. Here, the expression and cellular localization of Pappa2 in embryonic and postnatal kidneys of 26-P and SS rats were examined. Pappa2 mRNA expression was 5-fold higher in the embryonic kidney (day 20.5) of the 26-P rat compared with the SS rat. Pappa2 mRNA expression progressively increased with the development of kidney, reaching a peak at postnatal day 5 before trending downward in subsequent stages of development in both strains. At all tested time points, Pappa2 remained higher in the 26-P compared with the SS rat kidney. Immunohistochemistry studies localized PAPPA2 in the ureteric bud (UB) and distal part of S-shaped body. PAPPA2 was colocalized with IGFBP-5 in the UB and Na+/K+/2Cl- cotransporter-stained tubules, respectively. Future studies are needed to determine the role of Pappa2 in kidney development and mechanistic pathways involved in this process.
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Affiliation(s)
- Vikash Kumar
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Chun Yang
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Allen W Cowley
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
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Effects of 12-Week Supplementation of a Polyherbal Formulation in Old Adults with Prehypertension/Hypertension: A Randomized, Double-Blind, Placebo-Controlled Trial. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2019; 2019:7056872. [PMID: 31391860 PMCID: PMC6662493 DOI: 10.1155/2019/7056872] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Accepted: 06/24/2019] [Indexed: 11/25/2022]
Abstract
Background Uncontrolled blood pressure is the leading cause of mortality and disability due to associated cerebral and cardiovascular diseases and kidney failure. More than one-third of the old adult population have hypertension or prehypertension and many of their blood pressure are poorly controlled. Objective We hypothesized that plant extracts-based antioxidants may benefit those with prehypertension/hypertension. Method One hundred age- and gender-matched healthy older adults were randomly assigned to receive HyperBalance capsules (n=50) or placebo (n=50) at Tang-Qiao Community Health Service Center, Shanghai. Blood pressure and severity scores of hypertension treatment-related symptoms (dizziness, headache, ringing/buzzing in ears, rapid heart rate, and chest tightness) were evaluated before and after the 12-week intervention. Results Ninety-eight people completed the study, with 2 dropouts in the placebo group before the end of the study. Forty-one subjects (82%) of the HyperBalance group and 40 subjects (83.3%) of the placebo group had prehypertension (systolic blood pressures (SBP) between 130-139 and diastolic blood pressure (DBP) between 85-89mmHg), and 9 subjects (18%) in the HyperBalance group and 8 subjects (16.7%) in the placebo group had hypertension (≥140/90mmHg) before the intervention. HyperBalance significantly (P<0.01) reduced SBP from 136.18±4.38 to 124.14±3.96 mmHg and reduced DBP from 82.45±2.91 to 80.24±2.41mmHg, respectively, and reversed all 9 hypertension people to normotension or prehypertension state, whereas the placebo moderately reduced SBP from 135.79±4.22 to 132.35±4.656mmHg and reduced DBP from 82.90±3.07 to 82.27±3.01mmHg. All symptom severity scores became significantly lower in the HyperBalance group than in the placebo group after HyperBalance intervention: dizziness (0.82±0.44; vs 2.02±0.64, P<0.01); headache (0.46±0.50; vs 1.81±0.61, P<0.01); ringing/buzzing in ears (0.44±0.50; vs 1.04±0.29, P<0.01); and rapid heart rate and chest tightness (0.30±0.46; vs 0.92±0.28, P<0.01). Conclusion Polyherbal supplementation such as HyperBalance could benefit old adults with prehypertension/hypertension and improve treatment-related symptoms. Further studies are needed to validate the current findings.
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Khatkar S, Nanda A, Ansari SH. Comparative Evaluation of Conventional and Novel Extracts of Stem Bark of Terminalia arjuna for Antihypertensive Activity in BSO Induced Oxidative Stress based Rat Model. Curr Pharm Biotechnol 2019; 20:157-167. [PMID: 30806310 DOI: 10.2174/1389201020666190222185209] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2018] [Revised: 02/07/2019] [Accepted: 02/10/2019] [Indexed: 11/22/2022]
Abstract
BACKGROUND Terminalia arjuna (TA) has been reported and explored traditionally for its cardiotonic properties while the mechanism of antihypertensive effect of TA has not been clearly reported. METHOD The oxidative stress is a major cause for hypertension, hence different extracts of TA having variable marker yield were evaluated for their antihypertensive effect in buthionine sulfoxamine (BSO) induced oxidative stress based model. Soxhlet extraction (SE), room temperature extraction (RTE), microwave assisted extraction (MAE), and ultrasound assisted extraction (USAE) were quantitatively estimated for marker compounds arjunolic acid and arjunic acid through HPTLC. RESULTS The hypertension was induced using buthionine sulfoxamine (2 mmol/kg b.w. i.p.) and results suggested that the MAE and USAE showed better recovery of systolic blood pressure (110.33±0.10 and 118.33±0.10) and GSH level (3.62±0.07 nmoles/mL and 3.22±0.13 nmoles/mL), respectively as compared to the positive control group treated with ascorbic acid (Systolic BP: 119.67±0.10, GSH level: 3.11±0.10 nmoles/mL). The RTE and SE also showed a decrease in hypertension but were having moderate effect as compared with the standard positive control. CONCLUSION The total percentage yield, the yield of the marker compounds arjunolic and arjunic acid, the IC50 values for antioxidant activity as well as the antihypertensive effect were in order: MAE>USAE>SE>RTE that suggested the role of biomarkers arjunolic acid and arjunic acid in reversing the effect of buthionine sulfoxamine.
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Affiliation(s)
- Sarita Khatkar
- Vaish Institute of Pharmaceutical Education and Research, Rohtak, India
| | - Arun Nanda
- Faculty of Pharmaceutical Sciences, M.D. University, Rohtak, Haryana 124001, India
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Current Opinion for Hypertension in Renal Fibrosis. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1165:37-47. [DOI: 10.1007/978-981-13-8871-2_3] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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25
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Kozłowska A, Wojtacha P, Równiak M, Kolenkiewicz M, Huang ACW. ADHD pathogenesis in the immune, endocrine and nervous systems of juvenile and maturating SHR and WKY rats. Psychopharmacology (Berl) 2019; 236:2937-2958. [PMID: 30737597 PMCID: PMC6820808 DOI: 10.1007/s00213-019-5180-0] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Accepted: 01/23/2019] [Indexed: 01/10/2023]
Abstract
RATIONALE Attention-deficit/hyperactivity disorder (ADHD) is one of the most common neurobehavioural disorders with morphological and functional brain abnormalities. However, there is a growing body of evidence that abnormalities in the immune and endocrine systems may also account for the ADHD pathogenesis. OBJECTIVES To test ADHD pathogenesis in neurological, immune and endocrine systems, this study examined the concentrations of cytokines, chemokines, oxidative stress markers, metabolic parameters, steroid hormones and steroidogenic enzymes in the serum and/or tissues of spontaneously hypertensive rats (SHRs, animal model of ADHD) and Wistar Kyoto rats (WKYs, control animals). Moreover, the volume of the medial prefrontal cortex (mPFC) as well as the density of dopamine 2 (D2) receptor-expressing cells and tyrosine hydroxylase (TH)-positive nerve fibres in it was also elucidated. METHODS Peripheral blood, spleen and adrenal gland samples, as well as brain sections collected on day 35 (juvenile) and day 70 (maturating) from SHRs and WKYs, were processed by ELISA and immunohistochemistry, respectively. RESULTS The results show significant increases of serum and/or tissue concentrations of cytokines, chemokines and oxidative stress markers in juvenile SHRs when compared to the age-matched WKYs. These increases were accompanied by a lowered volume of the mPFC and up-regulation of D2 in this brain region. In maturating SHRs, the levels of inflammatory and oxidative stress markers were normalised and accompanied by elevated contents of steroid hormones. CONCLUSIONS Significant elevations of serum and/or tissue contents of cytokines, chemokines and oxidative stress markers as well as volumetric and neurochemical alterations in the mPFC of juvenile SHRs may suggest the cooperation of neurological and immune systems in the ADHD pathogenesis. Elevated levels of steroid hormones in maturating SHRs may be a compensatory effect involved in reducing inflammation and ADHD symptoms.
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Affiliation(s)
- Anna Kozłowska
- Department of Human Physiology, School of Medicine, Collegium Medicum, University of Warmia and Mazury in Olsztyn, Warszawska Av, 30, 10-082, Olsztyn, Poland.
| | - Paweł Wojtacha
- Department of Industrial and Food Microbiology, Faculty of Food Science, University of Warmia and Mazury in Olsztyn, Plac Cieszyński 1, 10-726 Olsztyn, Poland
| | - Maciej Równiak
- Department of Animal Anatomy and Physiology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Plac Łódzki 3, 10-727 Olsztyn, Poland
| | - Małgorzata Kolenkiewicz
- Department of Pathophysiology, School Medicine, Collegium Medicum, University of Warmia and Mazury in Olsztyn, Olsztyn, Warszawska Av, 30, 10-082 Olsztyn, Poland
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Basi Z, Turkoglu V. In vitro effect of oxidized and reduced glutathione peptides on angiotensin converting enzyme purified from human plasma. J Chromatogr B Analyt Technol Biomed Life Sci 2018; 1104:190-195. [PMID: 30508739 DOI: 10.1016/j.jchromb.2018.11.023] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Revised: 11/15/2018] [Accepted: 11/17/2018] [Indexed: 10/27/2022]
Abstract
Angiotensin converting enzyme (ACE, peptidyldipeptidase A, EC 3.4.15.1) plays an important role in the regulation of blood pressure. In this study, ACE was purified from human plasma by affinity chromatography in single step. The enzyme purified in 5367-fold from human plasma and specific activity was found to be 1208 EU/mg protein. The purity and molecular weight of ACE were determined by SDS-PAGE, which indicated two bands at around 60 kDa and 70 kDa on the gel. Effect of oxidized glutathione (GSSG) peptide and reduced glutathione (GSH) peptide on purified ACE activity were also investigated in which lisinopril was used as reference inhibitor. GSSG showed activation effect on ACE activity whereas GSH provided inhibition effect. In the lights of activity (%) versus activator graph for GSSG and activity (%) versus inhibitor graphs for GSH and lisinopril; IC50 values for GSH and lisinopril were determined to be 16.2 μM and 0.781 nM, respectively. Type of inhibition for GSH and lisinopril from graph Lineweaver-Burk was found to be reversible non-competitive inhibition and Ki constants for GSH and lisinopril were calculated as 11.7 μM and 0.662 nM, respectively.
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Affiliation(s)
- Zehra Basi
- Van Yüzüncü Yıl University, School of Health, Department of Nutrition and Dietetics, Van, Turkey.
| | - Vedat Turkoglu
- Van YüzüncüYıl University, Faculty of Science, Department of Chemistry, Van, Turkey
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Ewees MG, Messiha BAS, Abdel-Bakky MS, Bayoumi AMA, Abo-Saif AA. Tempol, a superoxide dismutase mimetic agent, reduces cisplatin-induced nephrotoxicity in rats. Drug Chem Toxicol 2018; 42:657-664. [PMID: 30067109 DOI: 10.1080/01480545.2018.1485688] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Cisplatin (CP) is one of the most potent anti-cancer drugs used against different types of cancer. Its use is limited due to its nephrotoxicity. This study is aimed to evaluate the role of a super oxide dismutase (SOD) mimetic agent, tempol, in protection against CP nephrotoxicity in rats. Animals were divided into four groups: Group-1: Normal control group, Group-2: CP group (single dose of CP 6 mg/kg, i.p.), Group-3 and Group-4: Tempol-treated groups (50 mg/kg p.o. and 100 mg/kg p.o. respectively) daily for a week before CP injection and continued for an additional four days after CP injection. Urine and blood samples were collected for the evaluation of kidney function including serum creatinine, BUN, cystatin-c, and creatinine clearance. In addition, western blotting was used to determine urine lipocalin-2 content. Furthermore, kidney tissue was collected for the determination of oxidative stress markers, caspase-3 expression, and histopathological examination. We noticed that both doses of tempol significantly improved kidney function, which was deteriorated by CP injection. Tempol significantly elevated kidney glutathione (GSH) content and SOD activity, and decreased kidney lipid peroxidation and NOx production. Tempol also significantly decreased kidney caspase-3 expression which was elevated by CP toxicity. Thus, we conclude that tempol can protect against CP nephrotoxicity. We noticed that both doses of tempol are effective in ameliorating CP-nephrotoxicity.
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Affiliation(s)
- Mohamed G Ewees
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Nahda University, Beni-Suef, Egypt
| | - Basim A S Messiha
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Beni-Suef University, Beni-Suef, Egypt
| | - Mohamed S Abdel-Bakky
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Nahda University, Beni-Suef, Egypt.,Department of Pharmacology and Toxicology, Faculty of Pharmacy, Alazhar University, Cairo, Egypt
| | - Asmaa M A Bayoumi
- Department of Biochemistry, Faculty of Pharmacy, Minia University, Minia, Egypt
| | - Ali A Abo-Saif
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Nahda University, Beni-Suef, Egypt.,Department of Pharmacology, Faculty of Medicine, Al-Azhar University, Cairo, Egypt
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Safaeian L, Emami R, Hajhashemi V, Haghighatian Z. Antihypertensive and antioxidant effects of protocatechuic acid in deoxycorticosterone acetate-salt hypertensive rats. Biomed Pharmacother 2018; 100:147-155. [PMID: 29428662 DOI: 10.1016/j.biopha.2018.01.107] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 01/17/2018] [Accepted: 01/24/2018] [Indexed: 12/11/2022] Open
Abstract
Protocatechuic acid (PCA) is a natural antioxidant with beneficial cardiovascular properties. In this study, the effect of supplementation with PCA was investigated in deoxycorticosterone acetate (DOCA)-salt hypertension. Male Wistar rats received DOCA (25 mg/kg, s.c.) twice weekly and 1% NaCl in drinking water and simultaneously treated with PCA (50, 100 and 200 mg/kg, p.o.) for 4 weeks. Systolic blood pressure (SBP) was detected using tail-cuff method. Electrolytes including Na+, K+ and chloride, catalase activity, glutathione, total antioxidant capacity, malondialdehyde (MDA) and hydroperoxides concentration were measured in serum samples. Body and organs weight, water intake and, kidney and heart histopathology were also evaluated. Administration of PCA reversed the changes caused by DOCA-salt approximately at all doses. At the lowest dose, PCA significantly decreased SBP (132.5 ± 4.0 vs 152.3 ± 4.5 mmHg, P < .05), serum sodium (138.5 ± 1.52 vs 141 ± 1.50, P < .05) and chloride level (101.6 ± 1.47 vs 110 ± 1.39, P < .01) and raised serum potassium level (3.8 ± 0.09 vs 3.1 ± 0.17, P < .05) compared with DOCA-salt hypertensive rats. PCA increased serum catalase activity, total antioxidant capacity and glutathione concentration and reduced MDA and hydroperoxides levels. PCA also improved organ weight changes, reduced water intake and moderately prevented histopathological changes of kidney and heart upon DOCA-salt administration. The present study indicates the antihypertensive and antioxidant effects of PCA against DOCA-salt hypertension.
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Affiliation(s)
- Leila Safaeian
- Department of Pharmacology and Toxicology and Isfahan Pharmaceutical Sciences Research Center, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, Iran.
| | - Reyhaneh Emami
- Department of Pharmacology and Toxicology and Isfahan Pharmaceutical Sciences Research Center, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Valiollah Hajhashemi
- Department of Pharmacology and Toxicology and Isfahan Pharmaceutical Sciences Research Center, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Zahra Haghighatian
- Department of Pathology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
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Cai W, Zhang Z, Huang Y, Sun H, Qiu L. Vaccarin alleviates hypertension and nephropathy in renovascular hypertensive rats. Exp Ther Med 2017; 15:924-932. [PMID: 29399101 PMCID: PMC5772753 DOI: 10.3892/etm.2017.5442] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Accepted: 11/02/2017] [Indexed: 12/11/2022] Open
Abstract
The kidney is an important organ in the regulation of blood pressure, and it is also one of the primary target organs of hypertension. Kidney damage in response to hypertension eventually leads to renal insufficiency. The authors previously demonstrated that vaccarin exhibits a protective role in endothelial injury. However, the effects of vaccarin on the two-kidney, one clip (2K1C) renovascular hypertension model and subsequent kidney injury have yet to be fully elucidated. The present study was designed to investigate the roles and mechanisms of vaccarin in attenuating hypertension and whether vaccarin had beneficial effects on kidney injury. The 2K1C rats had greater fibrosis, apoptosis, reactive oxygen species production, inflammation, angiotensin II (Ang II) and angiotensin type 1 (AT1) receptors in the right kidney compared with normotensive rats, which were alleviated by a high dose of vaccarin and captopril. Vaccarin treatment attenuated hypertension, reduced fibrosis markers, NADPH oxidase (NOX)-2, NOX-4, 3-nitrotyrosine, tumor necrosis factor-α, interleukin 1β (IL-1β), and IL-6 protein levels and altered pro-apoptotic protein levels including caspase-3, anti-apoptosis protein B cell lymphoma (Bcl)-2 and Bcl-2 associated X, apoptosis regulator in the right kidney of 2K1C rats. These findings suggest that the protective effects of vaccarin on the right kidney in renovascular hypertension are possibly due to downregulation of fibrosis, inflammatory molecules, oxidative stress, Ang II, and AT1 receptor levels.
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Affiliation(s)
- Weiwei Cai
- Department of Basic Medicine, Wuxi School of Medicine, Jiangnan University, Wuxi, Jiangsu 214122, P.R. China
| | - Zhenpeng Zhang
- Department of Basic Medicine, Wuxi School of Medicine, Jiangnan University, Wuxi, Jiangsu 214122, P.R. China
| | - Yiqi Huang
- Department of Basic Medicine, Wuxi School of Medicine, Jiangnan University, Wuxi, Jiangsu 214122, P.R. China
| | - Haijian Sun
- Department of Basic Medicine, Wuxi School of Medicine, Jiangnan University, Wuxi, Jiangsu 214122, P.R. China
| | - Liying Qiu
- Department of Basic Medicine, Wuxi School of Medicine, Jiangnan University, Wuxi, Jiangsu 214122, P.R. China
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Oxidative Stress in Hemodialysis Patients: A Review of the Literature. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:3081856. [PMID: 29138677 PMCID: PMC5613374 DOI: 10.1155/2017/3081856] [Citation(s) in RCA: 118] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 05/14/2017] [Accepted: 08/14/2017] [Indexed: 02/07/2023]
Abstract
Hemodialysis (HD) patients are at high risk for all-cause mortality and cardiovascular events. In addition to traditional risk factors, excessive oxidative stress (OS) and chronic inflammation emerge as novel and major contributors to accelerated atherosclerosis and elevated mortality. OS is defined as the imbalance between antioxidant defense mechanisms and oxidant products, the latter overwhelming the former. OS appears in early stages of chronic kidney disease (CKD), advances along with worsening of renal failure, and is further exacerbated by the HD process per se. HD patients manifest excessive OS status due to retention of a plethora of toxins, subsidized under uremia, nutrition lacking antioxidants and turn-over of antioxidants, loss of antioxidants during renal replacement therapy, and leukocyte activation that leads to accumulation of oxidative products. Duration of dialysis therapy, iron infusion, anemia, presence of central venous catheter, and bioincompatible dialyzers are several factors triggering the development of OS. Antioxidant supplementation may take an overall protective role, even at early stages of CKD, to halt the deterioration of kidney function and antagonize systemic inflammation. Unfortunately, clinical studies have not yielded unequivocal positive outcomes when antioxidants have been administered to hemodialysis patients, likely due to their heterogeneous clinical conditions and underlying risk profile.
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Yuliandra Y, Armenia A, Arifin H. Antihypertensive and antioxidant activity of Cassytha filiformis L.: A correlative study. Asian Pac J Trop Biomed 2017. [DOI: 10.1016/j.apjtb.2017.06.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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The Effects of Long-Term Chaetomellic Acid A Administration on Renal Function and Oxidative Stress in a Rat Model of Renal Mass Reduction. BIOMED RESEARCH INTERNATIONAL 2017; 2017:5125980. [PMID: 28326323 PMCID: PMC5343227 DOI: 10.1155/2017/5125980] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Revised: 11/04/2016] [Accepted: 11/07/2016] [Indexed: 12/19/2022]
Abstract
Purpose. This study aimed to evaluate the effect of chronic treatment with chaetomellic acid A (CAA) on oxidative stress and renal function in a model of renal mass reduction. Methods. Male Wistar rats were subjected to 5/6 nephrectomy (RMR) or sham-operated (SO). One week after surgery, rats have been divided into four experimental groups: RMR: RMR rats without treatment (n = 14); RMR + CAA: RMR rats treated with CAA (n = 13); SO: SO rats without treatment (n = 13); and SO + CAA: SO rats treated with CAA (n = 13). CAA was intraperitoneally administered in a dose of 0.23 µg/Kg three times a week for six months. Results. RMR was accompanied by a significant reduction in catalase and glutathione reductase (GR) activity (p < 0.05) and a decrease in reduced glutathione (GSH)/oxidized glutathione (GSSG) ratio. CAA administration significantly increased catalase and GR activity (p < 0.05) and increased GSH/GSSG ratio, but no significant difference between the treated and nontreated groups was found in this ratio. No significant differences were found between the RMR groups in any of the parameters of renal function. However, CAA administration slightly improves some parameters of renal function. Conclusions. These data suggest that CAA could attenuate 5/6 RMR-induced oxidative stress.
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Wigati D, Anwar K, Sudarsono, Nugroho AE. Hypotensive Activity of Ethanolic Extracts of Morinda citrifolia L. Leaves and Fruit in Dexamethasone-Induced Hypertensive Rat. J Evid Based Complementary Altern Med 2016; 22:107-113. [PMID: 27313228 DOI: 10.1177/2156587216653660] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Revised: 03/28/2016] [Accepted: 04/24/2016] [Indexed: 12/16/2022] Open
Abstract
The effect of ethanolic extract of Morinda citrifolia leaves and fruit on blood pressure in dexamethasone-induced hypertension rat was evaluated. Total phenolic content of Morinda citrifolia leaves ethanolic extract (MCLEE) and Morinda citrifolia leaves ethanolic extract (MCFEE) was 1.789 ± 0.116 and 1.677 ± 0.051 mg of gallic acid equivalents per gram sample, respectively. Rutin level in MCLEE was 0.92 ± 0.19%, and scopoletin level in MCFEE was 0.46 ± 0.05%. MCLEE, MCFEE, and its extract combination significantly decreased the blood pressure of hypertensive rats. The combination group showed highest hypotensive activity by lowering systolic blood pressure by 16.71 ± 3.95%, diastolic blood pressure by 21.49 ± 7.90%, and mean arterial blood pressure by 19.58% ± 6.35. All extract treatments have not been able to repair or inhibit renal damage caused by dexamethasone induction.
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Affiliation(s)
- Dyan Wigati
- Faculty of Pharmacy, Universitas Gadjah Mada, Yogyakarta, Indonesia.,STIFAR Yayasan Farmasi, Semarang, Indonesia
| | - Khoerul Anwar
- Faculty of Pharmacy, Universitas Gadjah Mada, Yogyakarta, Indonesia.,Universitas Lambung Mangkurat, Banjarmasin, Indonesia
| | - Sudarsono
- Faculty of Pharmacy, Universitas Gadjah Mada, Yogyakarta, Indonesia
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Saez F, Hong NJ, Garvin JL. Luminal flow induces NADPH oxidase 4 translocation to the nuclei of thick ascending limbs. Physiol Rep 2016; 4:4/6/e12724. [PMID: 27033446 PMCID: PMC4814881 DOI: 10.14814/phy2.12724] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Accepted: 02/05/2016] [Indexed: 01/11/2023] Open
Abstract
Superoxide (O2−) exerts its physiological actions in part by causing changes in gene transcription. In thick ascending limbs flow‐induced O2− production is mediated by NADPH oxidase 4 (Nox4) and is dependent on protein kinase C (PKC). Polymerase delta interacting protein 2 (Poldip2) increases Nox4 activity, but it is not known whether Nox4 translocates to the nucleus and whether Poldip2 participates in this process. We hypothesized that luminal flow causes Nox4 translocation to the nuclei of thick ascending limbs in a PKC‐dependent process facilitated by Poldip2. To test our hypothesis, we studied the subcellular localization of Nox4 and Poldip2 using confocal microscopy and O2− production in the absence and presence of luminal flow. Luminal flow increased the ratio of nuclear to cytoplasmic intensity of Nox4 (N/C) from 0.3 ± 0.1 to 0.7 ± 0.1 (P < 0.01) and O2− production from 89 ± 15 to 231 ± 16 AU/s (P < 0.001). In the presence of flow PKC inhibition reduced N/C from 0.5 ± 0.1 to 0.2 ± 0.1 (P < 0.01). Flow‐induced O2− production was also blocked (flow: 142 ± 20 AU/s; flow plus PKC inhibition 26 ± 12 AU/s; P < 0.01). The cytoskeleton disruptor cytochalasin D (1 μmol/L) decreased flow‐induced Nox4 translocation by 0.3 ± 0.01 (P < 0.01); however, it did not reduce flow‐induced O2−. Flow did not alter Poldip2 localization. We conclude that: (1) luminal flow elicits Nox4 translocation to the nucleus in a PKC‐ and cytoskeleton‐dependent process; (2) Nox4 activation occurs before translocation; and (3) Poldip2 is not involved in Nox4 nuclear translocation. Flow‐induced Nox4 translocation to the nucleus may play a role in O2−‐dependent changes in thick ascending limbs.
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Affiliation(s)
- Fara Saez
- Department of Physiology and Biophysics, School of Medicine, Case Western Reserve University, Cleveland, Ohio
| | - Nancy J Hong
- Department of Physiology and Biophysics, School of Medicine, Case Western Reserve University, Cleveland, Ohio
| | - Jeffrey L Garvin
- Department of Physiology and Biophysics, School of Medicine, Case Western Reserve University, Cleveland, Ohio
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Vokurková M, Rauchová H, Řezáčová L, Vaněčková I, Zicha J. ROS production is increased in the kidney but not in the brain of Dahl rats with salt hypertension elicited in adulthood. Physiol Res 2016; 64:303-12. [PMID: 26066975 DOI: 10.33549/physiolres.933054] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Enhanced production of superoxide radicals by nicotinamide-adenine dinucleotide phosphate (NADPH) oxidase in the brain and/or kidney of salt hypertensive Dahl rats has been proposed to participate in the pathogenesis of this form of experimental hypertension. Most information was obtained in young Dahl salt-sensitive (DS) rats subjected to high salt intake prior to sexual maturation. Therefore, the aim of our study was to investigate whether salt hypertension induced in adult DS rats is also accompanied with a more pronounced oxidative stress in the brain or kidney as compared to Dahl salt-resistant (DR) controls. NADPH oxidase activity as well as the content of thiobarbituric acid-reactive substances (TBARS) and conjugated dienes (oxidative index), which indicate a degree of lipid peroxidation, were evaluated in two brain regions (containing either hypothalamic paraventricular nucleus or rostral ventrolateral medulla) as well as in renal medulla and cortex. High salt intake induced hypertension in DS rats but did not modify blood pressure in DR rats. DS and DR rats did not differ in NADPH oxidase-dependent production of ROS, TBARS content or oxidative index in either part of the brain. In addition, high-salt diet did not change significantly any of these brain parameters. In contrast, the enhanced NADPH oxidase-mediated ROS production (without significant signs of increased lipid peroxidation) was detected in the renal medulla of salt hypertensive DS rats. Our findings suggest that there are no signs of enhanced oxidative stress in the brain of adult Dahl rats with salt hypertension induced in adulthood.
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Affiliation(s)
- M Vokurková
- Institute of Physiology, Czech Academy of Sciences, Prague, Czech Republic.
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Joy M, Chakraborty K, Pananghat V. Comparative Bioactive Properties of Bivalve Clams Against Different Disease Molecular Targets. J Food Biochem 2016. [DOI: 10.1111/jfbc.12256] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Minju Joy
- Marine Biotechnology Division, ICAR-Central Marine Fisheries Research Institute; Ernakulam North P.O., PO Box 1603 Cochin 682018, Kerala India
| | - Kajal Chakraborty
- Marine Biotechnology Division, ICAR-Central Marine Fisheries Research Institute; Ernakulam North P.O., PO Box 1603 Cochin 682018, Kerala India
| | - Vijayagopal Pananghat
- Marine Biotechnology Division, ICAR-Central Marine Fisheries Research Institute; Ernakulam North P.O., PO Box 1603 Cochin 682018, Kerala India
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O'Connor PM, Guha A, Stilphen CA, Sun J, Jin C. Proton channels and renal hypertensive injury: a key piece of the Dahl salt-sensitive rat puzzle? Am J Physiol Regul Integr Comp Physiol 2016; 310:R679-90. [PMID: 26843580 DOI: 10.1152/ajpregu.00115.2015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Accepted: 01/25/2016] [Indexed: 02/07/2023]
Abstract
Hv1 is a voltage-gated proton channel highly expressed in phagocytic cells, where it participates in the NADPH oxidase-dependent respiratory burst. We have recently identified Hv1 as a novel renal channel, expressed in the renal medullary thick ascending limb that appears to importantly contribute to the pathogenesis of renal hypertensive injury in the Dahl salt-sensitive rat model. The purpose of this review is to describe the experimental approaches that we have undertaken to identify the source of excess reactive oxygen species production in the renal outer medulla of Dahl salt-sensitive rats and the resulting evidence that the voltage-gated proton channel Hv1 mediates augmented superoxide production and contributes to renal medullary oxidative stress and renal injury. In addition, we will attempt to point out areas of current controversy, as well as propose areas in which further experimental studies are likely to move the field forward. The content of the following review was presented as part of the Water and Electrolyte Homeostasis Section New Investigator Award talk at Experimental Biology 2014.
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Affiliation(s)
- Paul M O'Connor
- Department of Physiology, Augusta University, Augusta, Georgia; and
| | - Avirup Guha
- Department of Physiology, Augusta University, Augusta, Georgia; and
| | - Carly A Stilphen
- Department of Physiology, Augusta University, Augusta, Georgia; and
| | - Jingping Sun
- Department of Physiology, Augusta University, Augusta, Georgia; and
| | - Chunhua Jin
- Department of Medicine, Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
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Cheng D, Zhang X, Meng M, Han L, Li Z, Hou L, Qi W, Wang C. The protective effect of a buckwheat-enriched diet on renal injury in high salt-induced hypertension in rats. Food Funct 2016; 7:3548-54. [DOI: 10.1039/c6fo00296j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
An excess of dietary salt is the most common factor that contributes to the pathogenesis of hypertension.
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Affiliation(s)
- Dai Cheng
- Key Laboratory of Food Safety and Sanitation
- Ministry of Education
- College of Food Engineering and Biotechnology
- Tianjin University of Science and Technology
- Tianjin
| | - Xinyu Zhang
- Key Laboratory of Food Safety and Sanitation
- Ministry of Education
- College of Food Engineering and Biotechnology
- Tianjin University of Science and Technology
- Tianjin
| | - Meng Meng
- Key Laboratory of Food Safety and Sanitation
- Ministry of Education
- College of Food Engineering and Biotechnology
- Tianjin University of Science and Technology
- Tianjin
| | - Lirong Han
- Key Laboratory of Food Safety and Sanitation
- Ministry of Education
- College of Food Engineering and Biotechnology
- Tianjin University of Science and Technology
- Tianjin
| | - Zheng Li
- Key Laboratory of Food Safety and Sanitation
- Ministry of Education
- College of Food Engineering and Biotechnology
- Tianjin University of Science and Technology
- Tianjin
| | - Lihua Hou
- Key Laboratory of Food Safety and Sanitation
- Ministry of Education
- College of Food Engineering and Biotechnology
- Tianjin University of Science and Technology
- Tianjin
| | - Wentao Qi
- Academy of State Administration of Grain
- Beijing
- People's Republic of China
| | - Chunling Wang
- Key Laboratory of Food Safety and Sanitation
- Ministry of Education
- College of Food Engineering and Biotechnology
- Tianjin University of Science and Technology
- Tianjin
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Rathee JS, Patro BS, Brown L, Chattopadhyay S. Mechanism of the anti-hypertensive property of the naturally occurring phenolic, malabaricone C in DOCA-salt rats. Free Radic Res 2015; 50:111-21. [DOI: 10.3109/10715762.2015.1112005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Assessment of Nephroprotective Potential of Histochrome during Induced Arterial Hypertension. Bull Exp Biol Med 2015; 160:223-7. [DOI: 10.1007/s10517-015-3134-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Indexed: 11/27/2022]
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Cowley AW, Yang C, Zheleznova NN, Staruschenko A, Kurth T, Rein L, Kumar V, Sadovnikov K, Dayton A, Hoffman M, Ryan RP, Skelton MM, Salehpour F, Ranji M, Geurts A. Evidence of the Importance of Nox4 in Production of Hypertension in Dahl Salt-Sensitive Rats. Hypertension 2015; 67:440-50. [PMID: 26644237 DOI: 10.1161/hypertensionaha.115.06280] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Accepted: 11/11/2015] [Indexed: 12/24/2022]
Abstract
This study reports the consequences of knocking out NADPH (nicotinamide adenine dinucleotide phosphate) oxidase 4 (Nox4) on the development of hypertension and kidney injury in the Dahl salt-sensitive (SS) rat. Zinc finger nuclease injection of single-cell SS embryos was used to create an 8 base-pair frame-shift deletion of Nox4, resulting in a loss of the ≈68 kDa band in Western blot analysis of renal cortical tissue of the knock out of Nox4 in the SS rat (SS(Nox4-/-)) rats. SS(Nox4-/-) rats exhibited a significant reduction of salt-induced hypertension compared with SS rats after 21 days of 4.0% NaCl diet (134±5 versus 151±3 mm Hg in SS) and a significant reduction of albuminuria, tubular casts, and glomerular injury. Optical fluorescence 3-dimensional cryoimaging revealed significantly higher redox ratios (NADH/FAD [reduced nicotinamide adenine dinucleotide/flavin adenine dinucleotide]) in the kidneys of SS(Nox4-/-) rats even when fed the 0.4% NaCl diet, indicating greater levels of mitochondrial electron transport chain metabolic activity and reduced oxidative stress compared with SS rats. Before the development of hypertension, RNA expression levels of Nox subunits Nox2, p67(phox), and p22(phox) were found to be significantly lower (P<0.05) in SS(Nox4-/-) compared with SS rats in the renal cortex. Thus, the mutation of Nox4 seems to modify transcription of several genes in ways that contribute to the protective effects observed in the SS(Nox4-/-) rats. We conclude that the reduced renal injury and attenuated blood pressure response to high salt in the SS(Nox4-/-) rat could be the result of multiple pathways, including gene transcription, mitochondrial energetics, oxidative stress, and protein matrix production impacted by the knock out of Nox4.
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Affiliation(s)
- Allen W Cowley
- From the Department of Physiology (A.W.C., C.Y., N.N.Z., A.S., T.K., V.K., K.S., A.D., M.H., R.P.R., M.M.S., A.G.) and Division of Biostatistics, Institute for Health & Society (L.R.), Medical College of Wisconsin, Milwaukee; and Biophotonics Lab, University of Wisconsin, Milwaukee (F.S., M.R.).
| | - Chun Yang
- From the Department of Physiology (A.W.C., C.Y., N.N.Z., A.S., T.K., V.K., K.S., A.D., M.H., R.P.R., M.M.S., A.G.) and Division of Biostatistics, Institute for Health & Society (L.R.), Medical College of Wisconsin, Milwaukee; and Biophotonics Lab, University of Wisconsin, Milwaukee (F.S., M.R.)
| | - Nadezhda N Zheleznova
- From the Department of Physiology (A.W.C., C.Y., N.N.Z., A.S., T.K., V.K., K.S., A.D., M.H., R.P.R., M.M.S., A.G.) and Division of Biostatistics, Institute for Health & Society (L.R.), Medical College of Wisconsin, Milwaukee; and Biophotonics Lab, University of Wisconsin, Milwaukee (F.S., M.R.)
| | - Alexander Staruschenko
- From the Department of Physiology (A.W.C., C.Y., N.N.Z., A.S., T.K., V.K., K.S., A.D., M.H., R.P.R., M.M.S., A.G.) and Division of Biostatistics, Institute for Health & Society (L.R.), Medical College of Wisconsin, Milwaukee; and Biophotonics Lab, University of Wisconsin, Milwaukee (F.S., M.R.)
| | - Theresa Kurth
- From the Department of Physiology (A.W.C., C.Y., N.N.Z., A.S., T.K., V.K., K.S., A.D., M.H., R.P.R., M.M.S., A.G.) and Division of Biostatistics, Institute for Health & Society (L.R.), Medical College of Wisconsin, Milwaukee; and Biophotonics Lab, University of Wisconsin, Milwaukee (F.S., M.R.)
| | - Lisa Rein
- From the Department of Physiology (A.W.C., C.Y., N.N.Z., A.S., T.K., V.K., K.S., A.D., M.H., R.P.R., M.M.S., A.G.) and Division of Biostatistics, Institute for Health & Society (L.R.), Medical College of Wisconsin, Milwaukee; and Biophotonics Lab, University of Wisconsin, Milwaukee (F.S., M.R.)
| | - Vikash Kumar
- From the Department of Physiology (A.W.C., C.Y., N.N.Z., A.S., T.K., V.K., K.S., A.D., M.H., R.P.R., M.M.S., A.G.) and Division of Biostatistics, Institute for Health & Society (L.R.), Medical College of Wisconsin, Milwaukee; and Biophotonics Lab, University of Wisconsin, Milwaukee (F.S., M.R.)
| | - Katherine Sadovnikov
- From the Department of Physiology (A.W.C., C.Y., N.N.Z., A.S., T.K., V.K., K.S., A.D., M.H., R.P.R., M.M.S., A.G.) and Division of Biostatistics, Institute for Health & Society (L.R.), Medical College of Wisconsin, Milwaukee; and Biophotonics Lab, University of Wisconsin, Milwaukee (F.S., M.R.)
| | - Alex Dayton
- From the Department of Physiology (A.W.C., C.Y., N.N.Z., A.S., T.K., V.K., K.S., A.D., M.H., R.P.R., M.M.S., A.G.) and Division of Biostatistics, Institute for Health & Society (L.R.), Medical College of Wisconsin, Milwaukee; and Biophotonics Lab, University of Wisconsin, Milwaukee (F.S., M.R.)
| | - Matthew Hoffman
- From the Department of Physiology (A.W.C., C.Y., N.N.Z., A.S., T.K., V.K., K.S., A.D., M.H., R.P.R., M.M.S., A.G.) and Division of Biostatistics, Institute for Health & Society (L.R.), Medical College of Wisconsin, Milwaukee; and Biophotonics Lab, University of Wisconsin, Milwaukee (F.S., M.R.)
| | - Robert P Ryan
- From the Department of Physiology (A.W.C., C.Y., N.N.Z., A.S., T.K., V.K., K.S., A.D., M.H., R.P.R., M.M.S., A.G.) and Division of Biostatistics, Institute for Health & Society (L.R.), Medical College of Wisconsin, Milwaukee; and Biophotonics Lab, University of Wisconsin, Milwaukee (F.S., M.R.)
| | - Meredith M Skelton
- From the Department of Physiology (A.W.C., C.Y., N.N.Z., A.S., T.K., V.K., K.S., A.D., M.H., R.P.R., M.M.S., A.G.) and Division of Biostatistics, Institute for Health & Society (L.R.), Medical College of Wisconsin, Milwaukee; and Biophotonics Lab, University of Wisconsin, Milwaukee (F.S., M.R.)
| | - Fahimeh Salehpour
- From the Department of Physiology (A.W.C., C.Y., N.N.Z., A.S., T.K., V.K., K.S., A.D., M.H., R.P.R., M.M.S., A.G.) and Division of Biostatistics, Institute for Health & Society (L.R.), Medical College of Wisconsin, Milwaukee; and Biophotonics Lab, University of Wisconsin, Milwaukee (F.S., M.R.)
| | - Mahsa Ranji
- From the Department of Physiology (A.W.C., C.Y., N.N.Z., A.S., T.K., V.K., K.S., A.D., M.H., R.P.R., M.M.S., A.G.) and Division of Biostatistics, Institute for Health & Society (L.R.), Medical College of Wisconsin, Milwaukee; and Biophotonics Lab, University of Wisconsin, Milwaukee (F.S., M.R.)
| | - Aron Geurts
- From the Department of Physiology (A.W.C., C.Y., N.N.Z., A.S., T.K., V.K., K.S., A.D., M.H., R.P.R., M.M.S., A.G.) and Division of Biostatistics, Institute for Health & Society (L.R.), Medical College of Wisconsin, Milwaukee; and Biophotonics Lab, University of Wisconsin, Milwaukee (F.S., M.R.)
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Tucker PS, Briskey DR, Scanlan AT, Coombes JS, Dalbo VJ. High intensity interval training favourably affects antioxidant and inflammation mRNA expression in early-stage chronic kidney disease. Free Radic Biol Med 2015; 89:466-72. [PMID: 26453919 DOI: 10.1016/j.freeradbiomed.2015.07.162] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Revised: 07/14/2015] [Accepted: 07/25/2015] [Indexed: 12/13/2022]
Abstract
Increased levels of oxidative stress and inflammation have been linked to the progression of chronic kidney disease. To reduce oxidative stress and inflammation related to chronic kidney disease, chronic aerobic exercise is often recommended. Data suggests high intensity interval training may be more beneficial than traditional aerobic exercise. However, appraisals of differing modes of exercise, along with explanations of mechanisms responsible for observed effects, are lacking. This study assessed effects of eight weeks of high intensity interval training (85% VO2max), versus low intensity exercise (45-50% VO2max) and sedentary behaviour, in an animal model of early-stage chronic kidney disease. We examined kidney-specific mRNA expression of genes related to endogenous antioxidant enzyme activity (glutathione peroxidase 1; Gpx1, superoxide dismutase 1; Sod1, and catalase; Cat) and inflammation (kidney injury molecule 1; Kim1 and tumour necrosis factor receptor super family 1b; Tnfrsf1b), as well as plasma F2-isoprostanes, a marker of lipid peroxidation. Compared to sedentary behaviour, high intensity interval training resulted in increased mRNA expression of Sod1 (p=0.01) and Cat (p<0.001). Compared to low intensity exercise, high intensity interval training resulted in increased mRNA expression of Cat (p<0.001) and Tnfrsf1b (p=0.047). In this study, high intensity interval training was superior to sedentary behaviour and low intensity exercise as high intensity interval training beneficially influenced expression of genes related to endogenous antioxidant enzyme activity and inflammation.
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Affiliation(s)
- Patrick S Tucker
- Clinical Biochemistry Laboratory, Bruce Highway, Building 81, Central Queensland University, Rockhampton, Australia 4702; Human Exercise and Training Laboratory, Bruce Highway, Building 81, Central Queensland University, Rockhampton, Australia 4702.
| | - David R Briskey
- Antioxidant Research Group, Room 535, Human Movement and Nutrition Sciences Building, University of Queensland, Brisbane, Australia 4072.
| | - Aaron T Scanlan
- Clinical Biochemistry Laboratory, Bruce Highway, Building 81, Central Queensland University, Rockhampton, Australia 4702; Human Exercise and Training Laboratory, Bruce Highway, Building 81, Central Queensland University, Rockhampton, Australia 4702.
| | - Jeff S Coombes
- Antioxidant Research Group, Room 535, Human Movement and Nutrition Sciences Building, University of Queensland, Brisbane, Australia 4072.
| | - Vincent J Dalbo
- Clinical Biochemistry Laboratory, Bruce Highway, Building 81, Central Queensland University, Rockhampton, Australia 4702; Human Exercise and Training Laboratory, Bruce Highway, Building 81, Central Queensland University, Rockhampton, Australia 4702.
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Safaeian L, Javanmard SH, Mollanoori Y, Dana N. Cytoprotective and antioxidant effects of human lactoferrin against H2O2-induced oxidative stress in human umbilical vein endothelial cells. Adv Biomed Res 2015; 4:188. [PMID: 26605227 PMCID: PMC4617156 DOI: 10.4103/2277-9175.164010] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2014] [Accepted: 01/27/2015] [Indexed: 02/07/2023] Open
Abstract
Background: Lactoferrin (LF) is an iron-binding glycoprotein with antioxidant, anti-inflammatory and nitric oxide-dependent vasodilatory properties. In the present study, we investigated the protective and antioxidant effects of LF on H2O2-induced oxidative stress in human umbilical vein endothelial cells (HUVECs). Materials and Methods: HUVECs were pretreated by (6.25–100 μg/ml) LF for 24 h and then exposed to 0.5 mM H2O2 for 2 h. Cell viability was assessed by 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. The intra- and extra-cellular hydroperoxides concentration and ferric reducing antioxidant power (FRAP) were determined in pretreated cells. Results: Pretreatment of HUVECs with LF at the concentrations of 25–100 μg/ml significantly reduced the cytotoxicity of H2O2 in a concentration-dependent manner using MTT assay. LF pretreatment at different concentration ranges also decreased the hydroperoxides level and augmented the FRAP value in both intra-and extra-cellular assay. Conclusion: These findings revealed antioxidant and cytoprotective effects of LF against H2O2-induced oxidative stress in HUVECs. With regard to the beneficial vascular activity of LF, further investigations are suggested for understanding its clinical value in human endothelial dysfunction and prevention and/or treatment of CVDs.
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Affiliation(s)
- Leila Safaeian
- Department of Pharmacology and Toxicology, Isfahan Pharmaceutical Sciences Research Center, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Shaghayegh Haghjoo Javanmard
- Department of Physiology, Applied Physiology Research Center, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Yaser Mollanoori
- Department of Pharmacology and Toxicology, Isfahan Pharmaceutical Sciences Research Center, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Nasim Dana
- Department of Physiology, Applied Physiology Research Center, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
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Salehpour F, Ghanian Z, Yang C, Zheleznova NN, Kurth T, Dash RK, Cowley AW, Ranji M. Effects of p67phox on the mitochondrial oxidative state in the kidney of Dahl salt-sensitive rats: optical fluorescence 3-D cryoimaging. Am J Physiol Renal Physiol 2015; 309:F377-82. [PMID: 26062875 DOI: 10.1152/ajprenal.00098.2015] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Accepted: 06/09/2015] [Indexed: 02/07/2023] Open
Abstract
The goal of the present study was to quantify and correlate the contribution of the cytosolic p67(phox) subunit of NADPH oxidase 2 to mitochondrial oxidative stress in the kidneys of the Dahl salt-sensitive (SS) hypertensive rat. Whole kidney redox states were uniquely assessed using a custom-designed optical fluorescence three-dimensional cryoimager to acquire multichannel signals of the intrinsic fluorophores NADH and FAD. SS rats were compared with SS rats in which the cytosolic subunit p67(phox) was rendered functionally inactive by zinc finger nuclease mutation of the gene (SS(p67phox)-null rats). Kidneys of SS rats fed a 0.4% NaCl diet exhibited significantly (P = 0.023) lower tissue redox ratio (NADH/FAD; 1.42 ± 0.06, n = 5) than SS(p67phox)-null rats (1.64 ± 0.07, n = 5), indicating reduced levels of mitochondrial electron transport chain metabolic activity and enhanced oxidative stress in SS rats. When fed a 4.0% salt diet for 21 days, both strains exhibited significantly lower tissue redox ratios (P < 0.001; SS rats: 1.03 ± 0.05, n = 9, vs. SS(p67phox)-null rats: 1.46 ± 0.04, n = 7) than when fed a 0.4% salt, but the ratio was still significantly higher in SS(p67phox) rats at the same salt level as SS rats. These results are consistent with results from previous studies that found elevated medullary interstitial fluid concentrations of superoxide and H2O2 in the medulla of SS rats. We conclude that the p67(phox) subunit of NADPH oxidase 2 plays an important role in the excess production of ROS from mitochondria in the renal medulla of the SS rat.
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Affiliation(s)
- F Salehpour
- Biophotonics Lab, University of Wisconsin, Milwaukee, Wisconsin; and
| | - Z Ghanian
- Biophotonics Lab, University of Wisconsin, Milwaukee, Wisconsin; and
| | - C Yang
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - N N Zheleznova
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - T Kurth
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - R K Dash
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - A W Cowley
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - M Ranji
- Biophotonics Lab, University of Wisconsin, Milwaukee, Wisconsin; and
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Liu X, Wang W, Chen W, Jiang X, Zhang Y, Wang Z, Yang J, Jones JE, Jose PA, Yang Z. Regulation of blood pressure, oxidative stress and AT1R by high salt diet in mutant human dopamine D5 receptor transgenic mice. Hypertens Res 2015; 38:394-9. [PMID: 25716648 PMCID: PMC6400478 DOI: 10.1038/hr.2015.17] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Revised: 01/12/2015] [Accepted: 01/25/2015] [Indexed: 12/20/2022]
Abstract
Humans have dopamine D5 receptors (hD5R) with single-nucleotide polymorphisms and a diminished function. We generated hD5(F173L) cDNA that has a decreased response to D5R agonist-mediated increase in cAMP production and increased production of reactive oxygen species, relative to wild-type hD5R (hD5(WT)) cDNA expressed in Chinese hamster ovary cells. To investigate the role of hD5(F173L) in the pathogenesis of salt-sensitive hypertension, we generated transgenic mice overexpressing hD5(F173L) or hD5(WT) and fed them normal (0.8% NaCl) or high (4% NaCl) salt diet. On normal salt diet, the blood pressure, and renal NADPH oxidase activity and angiotensin type 1 receptor (AT1R) expression were higher in hD5(F173L) than hD5(WT) transgenic mice. After 2 weeks on high salt diet, the blood pressure and renal NADPH oxidase activity, but not AT1R expression, were increased in hD5(F173L) but not in hD5(WT) transgenic mice. Candesartan, an AT1R antagonist, decreased the blood pressure and NADPH oxidase activity in hD5(F173L) but not in hD5(WT) transgenic mice. We suggest that the ability of the hD5R to negatively regulate the renal NADPH oxidase activity and AT1R function may have important implications in the pathogenesis of salt-sensitive blood pressure. However, the mechanisms involved in regulating the balance of renal D5R and AT1R function in the oxidative stress-mediated salt-sensitive blood pressure remain to be determined.
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Affiliation(s)
- Xing Liu
- Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences (CAMS) & Comparative Medicine Centre, Peking Union Medical Collage (PUMC), Beijing, People's Republic China
| | - Wenjie Wang
- Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences (CAMS) & Comparative Medicine Centre, Peking Union Medical Collage (PUMC), Beijing, People's Republic China
| | - Wei Chen
- Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences (CAMS) & Comparative Medicine Centre, Peking Union Medical Collage (PUMC), Beijing, People's Republic China
| | - Xiaoliang Jiang
- Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences (CAMS) & Comparative Medicine Centre, Peking Union Medical Collage (PUMC), Beijing, People's Republic China
| | - Yanrong Zhang
- Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences (CAMS) & Comparative Medicine Centre, Peking Union Medical Collage (PUMC), Beijing, People's Republic China
| | - Zihao Wang
- Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences (CAMS) & Comparative Medicine Centre, Peking Union Medical Collage (PUMC), Beijing, People's Republic China
| | - Jian Yang
- Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD, USA
| | - John E Jones
- Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Pedro A Jose
- 1] Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD, USA [2] Department of Physiology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Zhiwei Yang
- Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences (CAMS) & Comparative Medicine Centre, Peking Union Medical Collage (PUMC), Beijing, People's Republic China
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High Intensity Interval Training Favourably Affects Angiotensinogen mRNA Expression and Markers of Cardiorenal Health in a Rat Model of Early-Stage Chronic Kidney Disease. BIOMED RESEARCH INTERNATIONAL 2015; 2015:156584. [PMID: 26090382 PMCID: PMC4458272 DOI: 10.1155/2015/156584] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Accepted: 04/03/2015] [Indexed: 12/19/2022]
Abstract
The majority of CKD-related complications stem from cardiovascular pathologies such as hypertension. To help reduce cardiovascular complications, aerobic exercise is often prescribed. Emerging evidence suggests high intensity interval training (HIIT) may be more beneficial than traditional aerobic exercise. However, appraisals of varying forms of aerobic exercise, along with descriptions of mechanisms responsible for health-related improvements, are lacking. This study examined the effects of 8 weeks of HIIT (85% VO2max), versus low intensity aerobic exercise (LIT; 45–50% VO2max) and sedentary behaviour (SED), in an animal model of early-stage CKD. Tissue-specific mRNA expression of RAAS-related genes and CKD-related clinical markers were examined. Compared to SED, HIIT resulted in increased plasma albumin (p = 0.001), reduced remnant kidney weight (p = 0.028), and reduced kidney weight-body weight ratios (p = 0.045). Compared to LIT, HIIT resulted in reduced Agt mRNA expression (p = 0.035), reduced plasma LDL (p = 0.001), triglycerides (p = 0.029), and total cholesterol (p = 0.002), increased plasma albumin (p = 0.047), reduced remnant kidney weight (p = 0.005), and reduced kidney weight-body weight ratios (p = 0.048). These results suggest HIIT is a more potent regulator of several markers that describe and influence health in CKD.
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Abstract
Intrarenal autoregulatory mechanisms maintain renal blood flow (RBF) and glomerular filtration rate (GFR) independent of renal perfusion pressure (RPP) over a defined range (80-180 mmHg). Such autoregulation is mediated largely by the myogenic and the macula densa-tubuloglomerular feedback (MD-TGF) responses that regulate preglomerular vasomotor tone primarily of the afferent arteriole. Differences in response times allow separation of these mechanisms in the time and frequency domains. Mechanotransduction initiating the myogenic response requires a sensing mechanism activated by stretch of vascular smooth muscle cells (VSMCs) and coupled to intracellular signaling pathways eliciting plasma membrane depolarization and a rise in cytosolic free calcium concentration ([Ca(2+)]i). Proposed mechanosensors include epithelial sodium channels (ENaC), integrins, and/or transient receptor potential (TRP) channels. Increased [Ca(2+)]i occurs predominantly by Ca(2+) influx through L-type voltage-operated Ca(2+) channels (VOCC). Increased [Ca(2+)]i activates inositol trisphosphate receptors (IP3R) and ryanodine receptors (RyR) to mobilize Ca(2+) from sarcoplasmic reticular stores. Myogenic vasoconstriction is sustained by increased Ca(2+) sensitivity, mediated by protein kinase C and Rho/Rho-kinase that favors a positive balance between myosin light-chain kinase and phosphatase. Increased RPP activates MD-TGF by transducing a signal of epithelial MD salt reabsorption to adjust afferent arteriolar vasoconstriction. A combination of vascular and tubular mechanisms, novel to the kidney, provides for high autoregulatory efficiency that maintains RBF and GFR, stabilizes sodium excretion, and buffers transmission of RPP to sensitive glomerular capillaries, thereby protecting against hypertensive barotrauma. A unique aspect of the myogenic response in the renal vasculature is modulation of its strength and speed by the MD-TGF and by a connecting tubule glomerular feedback (CT-GF) mechanism. Reactive oxygen species and nitric oxide are modulators of myogenic and MD-TGF mechanisms. Attenuated renal autoregulation contributes to renal damage in many, but not all, models of renal, diabetic, and hypertensive diseases. This review provides a summary of our current knowledge regarding underlying mechanisms enabling renal autoregulation in health and disease and methods used for its study.
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Affiliation(s)
- Mattias Carlström
- Department of Medicine, Division of Nephrology and Hypertension and Hypertension, Kidney and Vascular Research Center, Georgetown University, Washington, District of Columbia; Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden; and Department of Cell Biology and Physiology, UNC Kidney Center, and McAllister Heart Institute, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Christopher S Wilcox
- Department of Medicine, Division of Nephrology and Hypertension and Hypertension, Kidney and Vascular Research Center, Georgetown University, Washington, District of Columbia; Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden; and Department of Cell Biology and Physiology, UNC Kidney Center, and McAllister Heart Institute, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - William J Arendshorst
- Department of Medicine, Division of Nephrology and Hypertension and Hypertension, Kidney and Vascular Research Center, Georgetown University, Washington, District of Columbia; Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden; and Department of Cell Biology and Physiology, UNC Kidney Center, and McAllister Heart Institute, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
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Chronic kidney disease influences multiple systems: describing the relationship between oxidative stress, inflammation, kidney damage, and concomitant disease. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2015; 2015:806358. [PMID: 25861414 PMCID: PMC4377508 DOI: 10.1155/2015/806358] [Citation(s) in RCA: 116] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/25/2014] [Accepted: 03/03/2015] [Indexed: 01/11/2023]
Abstract
Chronic kidney disease (CKD) is characterized by increased levels of oxidative stress and inflammation. Oxidative stress and inflammation promote renal injury via damage to molecular components of the kidney. Unfortunately, relationships between inflammation and oxidative stress are cyclical in that the inflammatory processes that exist to repair radical-mediated damage may be a source of additional free radicals, resulting in further damage to renal tissue. Oxidative stress and inflammation also have the ability to become systemic, serving to injure tissues distal to the site of original insult. This review describes select mediators in the exacerbatory relationship between oxidative stress, inflammation, and CKD. This review also discusses oxidative stress, inflammation, and CKD as they pertain to the development and progression of common CKD-associated comorbidities. Lastly, the utility of several widely accessible and cost-effective lifestyle interventions and their ability to reduce oxidative stress and inflammation are discussed and recommendations for future research are provided.
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Ueda M, Uchimura K, Narita Y, Miyasato Y, Mizumoto T, Morinaga J, Hayata M, Kakizoe Y, Adachi M, Miyoshi T, Shiraishi N, Kadowaki D, Sakai Y, Mukoyama M, Kitamura K. The serine protease inhibitor camostat mesilate attenuates the progression of chronic kidney disease through its antioxidant effects. Nephron Clin Pract 2015; 129:223-32. [PMID: 25766432 DOI: 10.1159/000375308] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Accepted: 01/19/2015] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND/AIMS We have so far demonstrated the renoprotective effect of camostat mesilate (CM) in 5/6 nephrectomized rats at least partly through its antioxidant effect. However, precise mechanisms were not fully clarified. Therefore, we now examined the renoprotective and antioxidant mechanisms of CM by using the adenine-induced chronic kidney disease (CKD) rat model. METHODS In protocol 1, we analyzed the effect of CM on CKD. Rats were fed on a 0.75% adenine diet for 3 weeks to induce CKD followed by the experimental period with vehicle, CM, or hydralazine (HYD) treatment for 5 weeks. In protocol 2, we examined the safety of CM and HYD on the normal rats. In addition, we explored free radical scavenging activities of CM and its metabolites in vitro using electron paramagnetic resonance (EPR) spectroscopy. RESULTS CM, but not HYD, significantly reduced the serum creatinine levels, although both treatments showed similar reduction in the blood pressure. CM decreased mRNA expression and protein levels of fibrotic markers, the severity of renal fibrosis, the accumulation of oxidative stress, and the expression of NADPH oxidase components in the kidney. In the protocol 2, there were no statistically significant differences in general parameters except for the systolic blood pressure in HYD group. EPR study revealed that CM and its metabolites have potent hydroxyl radical scavenging activities in vitro. CONCLUSION Our findings indicate that CM significantly ameliorates the progression of CKD partly through its antioxidant effect independently from its blood pressure-lowering effect. Our results suggest the possibility that CM could be a new therapeutic agent that could arrest the progression of CKD.
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Affiliation(s)
- Miki Ueda
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan
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Evans LC, Ryan RP, Broadway E, Skelton MM, Kurth T, Cowley AW. Null mutation of the nicotinamide adenine dinucleotide phosphate-oxidase subunit p67phox protects the Dahl-S rat from salt-induced reductions in medullary blood flow and glomerular filtration rate. Hypertension 2014; 65:561-8. [PMID: 25489057 DOI: 10.1161/hypertensionaha.114.04468] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Null mutations in the p67(phox) subunit of nicotinamide adenine dinucleotide phosphate-oxidase confer protection from salt sensitivity on Dahl salt-sensitive rats. Here, we track the sequential changes in medullary blood flow (MBF), glomerular filtration rate (GFR), urinary protein, and mean arterial pressure in SSp67(phox) null rats and wild-type littermates during 21 days of 4.0% NaCl high-salt (HS) diet. Optical fibers were implanted in the renal medulla and MBF was measured in conscious rats by laser Doppler flowmetry. Separate groups of rats were prepared with femoral venous catheters and GFR was measured by the transcutaneous assessment of fluorescein isothiocyanate-sinistrin disappearance curves. Mean arterial blood pressure was measured by telemetry. In wild-type rats, HS caused a rapid reduction in MBF, which was significantly lower than control values by HS day-6. Reduced MBF was associated with a progressive increase in mean arterial pressure, averaging 170±5 mm Hg by HS salt day-21. A significant reduction in GFR was evident on day-14 HS, after the onset of hypertension and reduced MBF. In contrast, HS had no significant effect on MBF in SSp67(phox) null rats and the pressor response to sodium was blunted, averaging 150±3 mm Hg on day-21 HS. GFR was maintained throughout the study and proteinuria was reduced. In summary, when p67(phox) is not functional in the salt-sensitive rats, HS does not cause reduced MBF and salt-sensitive hypertension is attenuated, and consequently renal injury is reduced and GFR is maintained.
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Affiliation(s)
- Louise C Evans
- From the Department of Physiology, Medical College of Wisconsin, Milwaukee
| | - Robert P Ryan
- From the Department of Physiology, Medical College of Wisconsin, Milwaukee
| | - Elizabeth Broadway
- From the Department of Physiology, Medical College of Wisconsin, Milwaukee
| | - Meredith M Skelton
- From the Department of Physiology, Medical College of Wisconsin, Milwaukee
| | - Theresa Kurth
- From the Department of Physiology, Medical College of Wisconsin, Milwaukee
| | - Allen W Cowley
- From the Department of Physiology, Medical College of Wisconsin, Milwaukee.
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