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Zuo ML, Chen QY, Pu L, Shi L, Wu D, Li H, Luo X, Yin LX, Siu CW, Hong DQ, Gan H. Impact of Hemodialysis on Left Ventricular-Arterial Coupling in End-Stage Renal Disease Patients. Blood Purif 2023; 52:702-711. [PMID: 37579725 DOI: 10.1159/000531188] [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: 02/06/2023] [Accepted: 05/18/2023] [Indexed: 08/16/2023]
Abstract
INTRODUCTION As a key determinant of cardiovascular performance, vascular-arterial coupling (VAC) has been reported to be a predictor of clinical outcomes in various clinical scenarios. However, few studies have explored how acute fluid removal during hemodialysis (HD) impacts the interaction between cardiac function and the arterial system. METHODS We recruited 317 HD patients from an established renal dialysis unit for this cross-sectional study and a total of 285 were included in the final analyses. We measured left ventricle end-systolic elastance (Ees), the effective arterial elastance (Ea), and VAC before and after HD using noninvasive echocardiographic measurements. We also compared echocardiographic and hemodynamic parameters in ventriculo-arterial coupling and ventriculo-arterial uncoupling patients. RESULTS HD significantly altered partial ventricular and vascular function parameters such as blood pressure, left ventricular end-diastolic volume, stroke volume, left ventricular ejection fraction, and systemic vascular resistance index. Ea increased following HD from 3.5 ± 1.4 to 4.2 ± 1.8 mm Hg/mL (p < 0.0001), Ees increased following HD from 7.9 ± 5.5 to 9.2 ± 6.9 mm Hg/mL (p = 0.04), whereas VAC did not markedly alter as a result of HD. Ventriculo-arterial uncoupling was found to be related to abnormal cardiac structure and worse systolic function. CONCLUSIONS VAC obtained from echocardiography is likely to be load-independent and useful as a reliable index for stratifying the risk of cardiovascular diseases in HD patients. Further investigations on larger patient cohorts are needed to further validate our findings.
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Affiliation(s)
- Ming-Liang Zuo
- Department of Nephrology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China,
| | - Qiu-Yi Chen
- Cardiovascular Ultrasound and Non-Invasive Cardiology Department, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, China
| | - Lei Pu
- Department of Nephrology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, China
| | - Lan Shi
- Cardiovascular Ultrasound and Non-Invasive Cardiology Department, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, China
| | - Dan Wu
- Cardiovascular Ultrasound and Non-Invasive Cardiology Department, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, China
| | - Hua Li
- Cardiovascular Ultrasound and Non-Invasive Cardiology Department, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, China
| | - Xian Luo
- Cardiovascular Ultrasound and Non-Invasive Cardiology Department, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, China
| | - Li-Xue Yin
- Cardiovascular Ultrasound and Non-Invasive Cardiology Department, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, China
| | - Chung-Wah Siu
- Cardiology Division, Department of Medicine, Queen Mary Hospital, The University of Hong Kong, Hong Kong, Hong Kong, China
| | - Da-Qing Hong
- Department of Nephrology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, China
| | - Hua Gan
- Department of Nephrology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
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Effect of Near-Infrared Blood Photobiomodulation on Red Blood Cell Damage from the Extracorporeal Circuit during Hemodialysis In Vitro. PHOTONICS 2022. [DOI: 10.3390/photonics9050341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The contact of blood with the bioincompatible membranes of the dialyzer, which is part of the extracorporeal circuit during hemodialysis (HD), causes upregulation of various cellular and non-cellular processes, including massive generation and release of reactive oxygen species (ROS), (which is one of the primary causes of anemia in chronic renal failure). We hypothesize that near-infrared (NIR) radiation possesses antioxidant properties and is considered to protect the red blood cell (RBC) membrane by enhancing its resilience to negative pressures. Our experimental setup consisted of an HD machine equipped with a dialyzer with a polyamide membrane; whole bovine blood was examined in vitro in blood-treated circulation. Blood samples were taken at 0, 5, 15, and 30 min during the HD therapy. We also assessed osmotic fragility, hematocrit, hemolysis, and oxidative stress as a concentration of reactive thiobarbituric acid substances (TBARS). Our results have shown that RBC membrane peroxidation increased significantly after 30 min of circulation, whereas the TBARS level in NIR-treated blood remained relatively steady throughout the experiment. The osmotic fragility of NIR-irradiated samples during dialysis was decreased compared to control samples. Our studies confirm that in vitro, blood photobiomodulation using NIR light diminishes oxidative damage during HD and can be considered a simultaneous pretreatment strategy for HD.
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Misian M, Baum E, Bręborowicz A. Secretory activity of the coronary artery endothelial cells in conditions of the peritoneal dialysis. Ren Fail 2022; 44:54-61. [PMID: 35174782 PMCID: PMC8856042 DOI: 10.1080/0886022x.2021.2023024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Introduction Endothelial dysfunction is frequent in patients treated with peritoneal dialysis and may lead to cardiac complications. We evaluated the effect of effluent dialysates and serum on the function of coronary artery endothelial cells (CAEC). Methods Human CAEC in in vitro culture were exposed to serum and dialysates from 24 patients treated with continuous ambulatory peritoneal dialysis (CAPD) and secretion of interleukin-6 (IL6), von Willebrand factor (vWF), tissue plasminogen activator (t-PA) and plasminogen activator inhibitor-1 (PAI-1) were measured. Modulation of the secretory activity of CAEC by Sulodexide, mixture of glycosaminoglycans: heparin sulfate and dermatan sulfate, was studied. Results Serum from CAPD patients stimulated synthesis of IL6 (+93%), vWF (+18%), and PAI-1 (+20%) and did not change t-PA secretion in CAEC. Dialysates stimulated secretion of IL6 (+89%), vWF (+29%), and PAI-1 (+31%) and did not change t-PA synthesis. Dialysates collected in 12 patients after 6 months more strongly stimulated synthesis of IL6 (+37%) and PAI-1 (+7%). Sulodexide suppressed the secretory activity of CAEC stimulated by the studied sera: IL6 (–38%), vWF (–19%), t-PA (–13%), and PAI-1 (–12%). Conclusions Serum and the dialysate from CAPD patients induce inflammatory and prothrombotic reaction in coronary arterial endothelial cells. The general pattern of the observed effects for serum and dialysates was similar but the intensity of the effects was not identical. Sulodexide reduced these effects.
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Affiliation(s)
- Monika Misian
- Department of Pathophysiology, Poznan University of Medical Sciences, Poznań, Poland
| | - Ewa Baum
- Department of Pathophysiology, Poznan University of Medical Sciences, Poznań, Poland
| | - Andrzej Bręborowicz
- Department of Pathophysiology, Poznan University of Medical Sciences, Poznań, Poland
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Waheed H, Farrukh S, Hussain A, Mukhtar A, Mubashir M, Saqib S, Ullah S, Peter AP, Khoo KS, Show PL. Green synthesized nano-cellulose polyethylene imine-based biological membrane. Food Chem Toxicol 2021; 160:112773. [PMID: 34953965 DOI: 10.1016/j.fct.2021.112773] [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: 10/06/2021] [Revised: 11/30/2021] [Accepted: 12/17/2021] [Indexed: 11/25/2022]
Abstract
In hemodialysis process, membrane serves as a barrier between blood and the dialysate. The barrier when contacted by blood accompanied activation of coagulation, immunity, and cellular passageways. In the recent years, hemodialysis membrane's biocompatibility has become a issue which leads to reduce the performance during the separation process. In previous work, we developed and evaluated a cellulose-based membrane blended with polyaziridine or polyetyleneimine in formic acid for hydrophilicity, pure water flux, surface morphology, and permeation efficiency. Biocompatibility was accessed, by conducting cellular viability and cellular attachments tests. In this study, the membrane compared to a non-treated control, and cell viability revealed active and growing cell cultures after 14 days. During the cellular attachment experiment, cell cultures attached to the fabricated membrane simulated the formation of cell junctions, proving that the membrane is non-toxic and biocompatible. CA + PEI + FA membrane tested with a blood mimic fluid having density identical to renal patient's blood. The BSA concentration in the feed solution was the same as that in the blood of the renal patient. The results revealed that the CA + PEI + FA membrane was able to reject 99% bovine serum albumin (BSA) and 69.6% urea. Therefore, from biocompatibility and blood mimic fluid testing, it is confirmed that the CA + PEI + FA membrane is the finest implant for dialysis applications.
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Affiliation(s)
- Hizba Waheed
- Department of Chemical Engineering, Wah Engineering College, University of Wah, Wah Cantt, Pakistan
| | - Sarah Farrukh
- School of Chemical and Materials Engineering (SCME), National University of Sciences and Technology (NUST), Islamabad, Pakistan.
| | - Arshad Hussain
- Department of Chemical Engineering, Pak-Austria Fachhochschule, IAST, KPK, Pakistan
| | - Amir Mukhtar
- School of Chemical and Materials Engineering (SCME), National University of Sciences and Technology (NUST), Islamabad, Pakistan
| | - Muhammad Mubashir
- Department of Petroleum Engineering, School of Engineering, Asia Pacific University of Technology and Innovation, 57000, Kuala Lumpur, Malaysia
| | - Sidra Saqib
- Department of Chemical Engineering, COMSATS University Islamabad, Lahore Campus, 54000, Pakistan
| | - Sami Ullah
- Department of Chemistry, King Khalid University, Abha, Saudi Arabia
| | - Angela Paul Peter
- Department of Chemical and Environmental Engineering, Faculty of Science and Engineering, University of Nottingham Malaysia, Jalan Broga, Semenyih, 43500, Selangor Darul Ehsan, Malaysia
| | - Kuan Shiong Khoo
- Faculty of Applied Sciences, UCSI University, UCSI Heights, 56000, Cheras, Kuala Lumpur, Malaysia.
| | - Pau Loke Show
- Department of Chemical and Environmental Engineering, Faculty of Science and Engineering, University of Nottingham Malaysia, Jalan Broga, Semenyih, 43500, Selangor Darul Ehsan, Malaysia.
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Niu Q, Zhao H, Zuo L, Wang M, Gan L. The effects of dialysis modalities on the progression of coronary artery calcification in dialysis patients. BMC Nephrol 2020; 21:302. [PMID: 32711477 PMCID: PMC7382852 DOI: 10.1186/s12882-020-01963-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Accepted: 07/17/2020] [Indexed: 11/12/2022] Open
Abstract
Background Hemodialysis (HD) tend to have more hemodynamic changes than peritoneal dialysis (PD), which aggravates inflammation and oxidative stress. Whether HD and PD have different effects on the progression of vascular calcification? Therefore, we produced a study to explore the relationship of dialysis modalities and coronary artery calcification (CAC) progression. Methods This was a prospective cohort study. CT scans were performed at enrollment and 2 years later for each patient. Demographic and clinical data were collected. Tobit regression was used to compare delta CAC score between HD and PD patients. Results (1) 155 patients were enrolled, including 69 HD and 86 PD patients. (2) The baseline CAC scores were 97 (1, 744) in HD and 95 (0, 324) in PD; the follow-up CAC scores were 343 (6, 1379) in HD and 293 (18, 997) in PD. There were no significant differences in baseline, follow-up and delta CAC scores between 2 groups (P > 0.05). (3) In Tobit regression, after adjusted for variables, there was no significant difference of CAC progression in HD and PD groups (P > 0.05). (4) Logistic regression showed that older age, diabetes and higher time-averaged serum phosphate (P) were associated with faster progression of CAC (P < 0.05), but there was no evidence that HD was associated with faster CAC progression compared with PD (P = 0.879). Conclusions There was no evidence that different dialysis modalities have different effect on CAC progression. Old age, DM and higher time-averaged P were associated with fast CAC progression.
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Affiliation(s)
- Qingyu Niu
- Department of Nephrology, Peking University People's Hospital, 11 Xizhimennan South Street, Xicheng District, Beijing, 100044, China
| | - Huiping Zhao
- Department of Nephrology, Peking University People's Hospital, 11 Xizhimennan South Street, Xicheng District, Beijing, 100044, China
| | - Li Zuo
- Department of Nephrology, Peking University People's Hospital, 11 Xizhimennan South Street, Xicheng District, Beijing, 100044, China
| | - Mei Wang
- Department of Nephrology, Peking University People's Hospital, 11 Xizhimennan South Street, Xicheng District, Beijing, 100044, China
| | - Liangying Gan
- Department of Nephrology, Peking University People's Hospital, 11 Xizhimennan South Street, Xicheng District, Beijing, 100044, China.
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Angeletti A, Zappulo F, Donadei C, Cappuccilli M, Di Certo G, Conte D, Comai G, Donati G, La Manna G. Immunological Effects of a Single Hemodialysis Treatment. MEDICINA (KAUNAS, LITHUANIA) 2020; 56:E71. [PMID: 32059426 PMCID: PMC7074458 DOI: 10.3390/medicina56020071] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Revised: 02/06/2020] [Accepted: 02/10/2020] [Indexed: 12/19/2022]
Abstract
Immune disorders, involving both innate and adaptive response, are common in patients with end-stage renal disease under chronic hemodialysis. Endogenous and exogenous factors, such as uremic toxins and the extracorporeal treatment itself, alter the immune balance, leading to chronic inflammation and higher risk of cardiovascular events. Several studies have previously described the immune effects of chronic hemodialysis and the possibility to modulate inflammation through more biocompatible dialyzers and innovative techniques. On the other hand, very limited data are available on the possible immunological effects of a single hemodialysis treatment. In spite of the lacking information about the immunological reactivity related to a single session, there is evidence to indicate that mediators of innate and adaptive response, above all complement cascade and T cells, are implicated in immune system modulation during hemodialysis treatment. Expanding our understanding of these modulations represents a necessary basis to develop pro-tolerogenic strategies in specific conditions, like hemodialysis in septic patients or the last session prior to kidney transplant in candidates for receiving a graft.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Gaetano La Manna
- Department of Experimental Diagnostic and Specialty Medicine (DIMES), Nephrology, Dialysis and Renal Transplant Unit, S. Orsola-Malpighi Hospital, University of Bologna, 40138 Bologna, Italy; (A.A.); (F.Z.); (C.D.); (M.C.); (G.D.C.); (D.C.); (G.C.); (G.D.)
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Slessarev M, Salerno F, Ball IM, McIntyre CW. Continuous renal replacement therapy is associated with acute cardiac stunning in critically ill patients. Hemodial Int 2019; 23:325-332. [PMID: 31094070 DOI: 10.1111/hdi.12760] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 04/04/2019] [Accepted: 04/14/2019] [Indexed: 01/25/2023]
Abstract
INTRODUCTION Intermittent renal replacement therapy induces cardiac stunning in chronic hemodialysis and acute kidney injury (AKI) patients. In chronic hemodialysis, recurrent stunning contributes to heart failure and cardiac death, with ultrafiltration and intradialytic hypotension being the principal determinants of this injury. Continuous renal replacement therapy (CRRT), with its lower ultrafiltration rates and improved hemodynamic profile, should protect against cardiac stunning in AKI. The objective of this study was to assess whether CRRT is associated with cardiac stunning in critically ill patients with AKI. METHODS We prospectively measured cardiac function using global and segmental longitudinal left ventricular strain using transthoracic echocardiography in 11 critically ill patients who were started on CRRT for AKI. We compared measurements at 4, 8, and 24 hours to baseline immediately prior to initiation of CRRT, with each patient serving as their own control. We also recorded blood pressure, heart rate, dose of vasoactive medications and intensive care unit mortality. FINDINGS Ten of 11 patients developed new regional cardiac stunning, with 8/11 within 4 hours of starting CRRT, despite stable hemodynamics. The number of affected left ventricular segments varied from 1 to 11 (out of 12). The stunning occurred both in patients with preserved and impaired baseline cardiac function, and 7/11 patients died in the intensive care unit. DISCUSSION Initiation of CRRT in critically ill patients with AKI is associated with cardiac stunning despite stable hemodynamics. This mechanism may explain lack of clinical benefit of CRRT over intermittent modalities and warrants further investigation to improve cardiovascular outcomes in critically ill patients with AKI.
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Affiliation(s)
- Marat Slessarev
- Department of Medicine, Western University, London, Ontario, Canada.,Department of Medical Biophysics, Western University, London, Ontario, Canada
| | - Fabio Salerno
- Department of Medicine, Western University, London, Ontario, Canada
| | - Ian M Ball
- Department of Medicine, Western University, London, Ontario, Canada.,Department of Epidemiology and Biostatistics, Western University, London, Ontario, Canada
| | - Christopher W McIntyre
- Department of Medicine, Western University, London, Ontario, Canada.,Department of Medical Biophysics, Western University, London, Ontario, Canada
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Liakopoulos V, Roumeliotis S, Zarogiannis S, Eleftheriadis T, Mertens PR. Oxidative stress in hemodialysis: Causative mechanisms, clinical implications, and possible therapeutic interventions. Semin Dial 2018; 32:58-71. [PMID: 30288786 DOI: 10.1111/sdi.12745] [Citation(s) in RCA: 71] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Oxidative stress (OS) is the result of prooxidant molecules overwhelming the antioxidant defense mechanisms. Hemodialysis (HD) constitutes a state of elevated inflammation and OS, due to loss of antioxidants during dialysis and activation of white blood cells triggering production of reactive oxygen species. Dialysis vintage, dialysis methods, and type and condition of vascular access, biocompatibility of dialyzer membrane and dialysate, iron administration, and anemia all can play a role in aggravating OS, which in turn has been associated with increased morbidity and mortality. Oral or intravenous administration of antioxidants may detoxify the oxidative molecules and at least in part repair OS-mediated tissue damage. Lifestyle interventions and optimization of a highly biocompatible HD procedure might ameliorate OS development in dialysis.
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Affiliation(s)
- Vassilios Liakopoulos
- Division of Nephrology and Hypertension, 1st Department of Internal Medicine, AHEPA Hospital, School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece.,Clinic of Nephrology and Hypertension, Diabetes and Endocrinology, Otto-von-Guericke University, Magdeburg, Germany
| | - Stefanos Roumeliotis
- Division of Nephrology and Hypertension, 1st Department of Internal Medicine, AHEPA Hospital, School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Sotirios Zarogiannis
- Department of Physiology, Faculty of Medicine, University of Thessaly, Larissa, Greece
| | - Theodoros Eleftheriadis
- Division of Nephrology and Hypertension, 1st Department of Internal Medicine, AHEPA Hospital, School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Peter R Mertens
- Clinic of Nephrology and Hypertension, Diabetes and Endocrinology, Otto-von-Guericke University, Magdeburg, Germany
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Plasma Protein Carbonylation in Haemodialysed Patients: Focus on Diabetes and Gender. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2018; 2018:4149681. [PMID: 30057679 PMCID: PMC6051011 DOI: 10.1155/2018/4149681] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Accepted: 04/30/2018] [Indexed: 12/14/2022]
Abstract
Patients with end-stage renal disease (ESRD) undergoing haemodialysis (HD) experience oxidative/carbonyl stress, which is postulated to increase after the HD session. The influence of diabetes mellitus and sex on oxidation of plasma proteins in ESRD has not yet been clarified despite that diabetic nephropathy is the most common cause of ESRD in developed and developing countries and despite the increasingly emerging differences between males and females in epidemiology, pathophysiology, clinical manifestations, and outcomes for several diseases. Therefore, this study aimed to evaluate the possible effect of type 2 diabetes mellitus, gender, and dialysis filter on plasma level of protein carbonyls (PCO) in ESRD patients at the beginning and at the end of a single HD session. Results show that mean post-HD plasma PCO levels are significantly higher than mean pre-HD plasma PCO levels and that the type of dialysis filter and dialysis technique are unrelated to plasma PCO levels. The mean level of plasma PCO after a HD session increases slightly but significantly in nondiabetic ESRD patients compared to diabetic ones, whereas it increases more markedly in women than in men. These novel findings suggest that women with ESRD are more susceptible than men to oxidative/carbonyl stress induced by HD.
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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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Pereira-Simon S, Rubio GA, Xia X, Cai W, Choi R, Striker GE, Elliot SJ. Inhibition of Advanced Glycation End Products (AGEs) Accumulation by Pyridoxamine Modulates Glomerular and Mesangial Cell Estrogen Receptor α Expression in Aged Female Mice. PLoS One 2016; 11:e0159666. [PMID: 27428057 PMCID: PMC4948910 DOI: 10.1371/journal.pone.0159666] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Accepted: 07/05/2016] [Indexed: 12/31/2022] Open
Abstract
Age-related increases in oxidant stress (OS) play a role in regulation of estrogen receptor (ER) expression in the kidneys. In this study, we establish that in vivo 17β-estradiol (E2) replacement can no longer upregulate glomerular ER expression by 21 months of age in female mice (anestrous). We hypothesized that advanced glycation end product (AGE) accumulation, an important source of oxidant stress, contributes to these glomerular ER expression alterations. We treated 19-month old ovariectomized female mice with pyridoxamine (Pyr), a potent AGE inhibitor, in the presence or absence of E2 replacement. Glomerular ERα mRNA expression was upregulated in mice treated with both Pyr and E2 replacement and TGFβ mRNA expression decreased compared to controls. Histological sections of kidneys demonstrated decreased type IV collagen deposition in mice receiving Pyr and E2 compared to placebo control mice. In addition, anti-AGE defenses Sirtuin1 (SIRT1) and advanced glycation receptor 1 (AGER1) were also upregulated in glomeruli following treatment with Pyr and E2. Mesangial cells isolated from all groups of mice demonstrated similar ERα, SIRT1, and AGER1 expression changes to those of whole glomeruli. To demonstrate that AGE accumulation contributes to the observed age-related changes in the glomeruli of aged female mice, we treated mesangial cells from young female mice with AGE-BSA and found similar downregulation of ERα, SIRT1, and AGER1 expression. These results suggest that inhibition of intracellular AGE accumulation with pyridoxamine may protect glomeruli against age-related oxidant stress by preventing an increase of TGFβ production and by regulation of the estrogen receptor.
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Affiliation(s)
- Simone Pereira-Simon
- Department of Surgery, University of Miami Miller School of Medicine, Miami, Florida, United States of America
| | - Gustavo A. Rubio
- Department of Surgery, University of Miami Miller School of Medicine, Miami, Florida, United States of America
| | - Xiaomei Xia
- Department of Surgery, University of Miami Miller School of Medicine, Miami, Florida, United States of America
| | - Weijing Cai
- Division of Experimental Diabetes and Aging, Department of Geriatrics and Palliative Care, Mount Sinai School of Medicine, 1 Gustave Levy Place, New York, New York, United States of America
| | - Rhea Choi
- Department of Medicine, University of Miami Miller School of Medicine, Miami, Florida, United States of America
| | - Gary E. Striker
- Division of Experimental Diabetes and Aging, Department of Geriatrics and Palliative Care, Mount Sinai School of Medicine, 1 Gustave Levy Place, New York, New York, United States of America
| | - Sharon J. Elliot
- Department of Surgery, University of Miami Miller School of Medicine, Miami, Florida, United States of America
- * E-mail:
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Valenzuela MP, Almirall J, Amengual MJ. Membrane Bioincompatibility and Ultrafiltration Effects on Pulse Wave Analysis during Haemodialysis. ISRN NEPHROLOGY 2013; 2013:892315. [PMID: 24967232 PMCID: PMC4045438 DOI: 10.5402/2013/892315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2012] [Accepted: 11/26/2012] [Indexed: 11/23/2022]
Abstract
Membrane bioincompatibility was demonstrated by successive white blood cell counts and C3a generation. Pulse wave analysis was obtained by applanation tonometry (SphygmoCor) in a sequential way: basal, after 30 minutes with nul ultrafiltration, and after a complete dialysis with ultrafiltration. At 15 minutes of haemodialysis, significant decrease in leukocyte count occurred: 6801 ± 1186 versus 4412 ± 1333 (P < 0.001), while C3a levels sharply increased from 427 ± 269 to 3501 ± 1638 ng/mL (P < 0.000). No changes were observed in augmentation index without ultrafiltration: 26.1 ± 11.1 versus 26.6 ± 12.4. Only aortic systolic blood pressure was lower at 15 minutes: 120.1 ± 17.7 versus 110.4 ± 25.8 mmHg (P = 0.009), in agreement with a reduction in brachial systolic blood pressure: 135.1 ± 18.1 versus 122.7 ± 27.4 mmHg (P = 0.01), without changes in aortic or brachial diastolic blood pressure. Important changes in pulse wave analysis were observed after a complete haemodialysis session: augmentation index 29.9 ± 10.1 versus 18.6 ± 15.0, aortic systolic blood pressure 139.8 ± 25.5 versus 119.4 ± 28.5 mmHg (P < 0.00), without changes in aortic diastolic blood pressure. In summary, haemodialysis with cellulose diacetate acutely induced a transient state of immunoactivation due to bioincompatibility, this phenomenon was nondetectable by pulse wave analysis. Complete haemodialysis session led to important changes in pulse wave analysis.
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Affiliation(s)
- Maria-Pau Valenzuela
- Nephrology Service, UDIAT, Corporació Parc Taulí and Departament de Medicina, Institut Universitari Parc Taulí (UAB), Parc Taulí S/N, 08208 Sabadell, Spain
| | - Jaume Almirall
- Nephrology Service, UDIAT, Corporació Parc Taulí and Departament de Medicina, Institut Universitari Parc Taulí (UAB), Parc Taulí S/N, 08208 Sabadell, Spain
| | - María-José Amengual
- Laboratory Department, UDIAT, Corporació Parc Taulí and Departament de Medicina, Institut Universitari Parc Taulí (UAB), Parc Taulí S/N, 08208 Sabadell, Spain
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Gosmanova EO, Le NA. Cardiovascular Complications in CKD Patients: Role of Oxidative Stress. Cardiol Res Pract 2011; 2011:156326. [PMID: 21253517 PMCID: PMC3022166 DOI: 10.4061/2011/156326] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2010] [Accepted: 12/08/2010] [Indexed: 11/20/2022] Open
Abstract
Starting with the early stages, patients with chronic kidney disease (CKD) experience higher burden of cardiovascular disease (CVD). Moreover, CVD complications are the major cause of mortality in CKD patients as compared with complications from chronic kidney failure. While traditional CVD risk factors, including diabetes, hypertension, hyperlipidemia, obesity, physical inactivity, may be more prevalent among CKD patients, these factors seem to underestimate the accelerated cardiovascular disease in the CKD population. Search for additional biomarkers that could explain the enhanced CVD risk in CKD patients has gained increasing importance. Although it is unlikely that any single nontraditional risk factor would fully account for the increased CVD risk in individuals with CKD, oxidative stress appears to play a central role in the development and progression of CVD and its complications. We will review the data that support the contribution of oxidative stress in the pathogenesis of CVD in patients with chronic kidney failure.
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Affiliation(s)
- Elvira O Gosmanova
- Nephrology Division, Department of Medicine, The University of Tennessee Health Science Center, Memphis, TN 38103, USA
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14
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Abstract
BACKGROUND Cardiovascular disease is the major cause of death in patients with renal insufficiency, accounting for 50% of all deaths in renal replacement therapy patients. Mortality from cardiovascular diseases in these patients is approximately 9% per year, which is about 30 times the risk in the general population. So far, intensive interventions to the general risk factors, such as high LDL-cholesterol or C-reactive protein, have not been successful in improving their cardiovascular outcomes, suggesting that the beneficial effect of risk reduction may be overwhelmed by accumulated risk memorized by long-term exposure to oxidative stress during the progression of renal failure. DESIGN In this review, we propose that this irreversible memory effect in renal failure may be mediated by advanced glycation end-products (AGEs). RESULTS The generation of AGEs has been implicated to be deeply associated with increased oxidative stress. Moreover, interaction of the receptor for AGEs (RAGE) with AGEs leads to crucial biomedical pathway generating intracellular oxidative stress and inflammatory mediators, which could result in further amplification of the pathway involved in AGE generation. Several lines of evidence suggest that AGEs/RAGE axis can profoundly be involved in cardiovascular diseases. Recent advances in AGEs and RAGE measurements led us to be capable of understanding more about the role of AGEs/RAGE axis as a risk for cardiovascular diseases in patients with renal failure. CONCLUSION AGEs/RAGE axis could be a crucial mediator of oxidative stress in renal failure. RAGE could be not only a useful biomarker, but also a potentially therapeutic target to overcome the accumulated adverse metabolic memory in renal failure.
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Affiliation(s)
- Hidenori Koyama
- Department of Metabolism, Endocrinology and Molecular Medicine, Osaka City University Graduate School of Medicine, Abeno-ku, Osaka, Japan.
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Meyer C, Heiss C, Drexhage C, Kehmeier ES, Balzer J, Mühlfeld A, Merx MW, Lauer T, Kühl H, Floege J, Kelm M, Rassaf T. Hemodialysis-Induced Release of Hemoglobin Limits Nitric Oxide Bioavailability and Impairs Vascular Function. J Am Coll Cardiol 2010; 55:454-9. [DOI: 10.1016/j.jacc.2009.07.068] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/09/2009] [Revised: 07/07/2009] [Accepted: 07/12/2009] [Indexed: 11/15/2022]
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Haemodialysis acutely reduces the plasma levels of ADMA without reversing impaired NO-dependent vasodilation. Clin Sci (Lond) 2009; 117:293-303. [DOI: 10.1042/cs20080561] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
End-stage renal disease patients have endothelial dysfunction and high plasma levels of ADMA (asymmetric ω-NG,NG-dimethylarginine), an endogenous inhibitor of NOS (NO synthase). The actual link between these abnormalities is controversial. Therefore, in the present study, we investigated whether HD (haemodialysis) has an acute impact on NO-dependent vasodilation and plasma ADMA in these patients. A total of 24 patients undergoing maintenance HD (HD group) and 24 age- and gender-matched healthy controls (Control group) were enrolled. The increase in forearm SkBF (skin blood flow) caused by local heating to 41 °C (SkBF41), known to depend on endothelial NO production, was determined with laser Doppler imaging. SkBF41 was expressed as a percentage of the vasodilatory reserve obtained from the maximal SkBF induced by local heating to 43 °C (independent of NO). In HD patients, SkBF41 was assessed on two successive HD sessions, once immediately before and once immediately after HD. Plasma ADMA was assayed simultaneously with MS/MS (tandem MS). In the Control group, SkBF41 was determined twice, on two different days, and plasma ADMA was assayed once. In HD patients, SkBF41 was identical before (82.2±13.1%) and after (82.7±12.4%) HD, but was lower than in controls (day 1, 89.6±6.1; day 2, 89.2±6.9%; P<0.01 compared with the HD group). In contrast, plasma ADMA was higher before (0.98±0.17 μmol/l) than after (0.58±0.10 μmol/l; P<0.01) HD. ADMA levels after HD did not differ from those obtained in controls (0.56±0.11 μmol/l). These findings show that HD patients have impaired NO-dependent vasodilation in forearm skin, an abnormality not acutely reversed by HD and not explained by ADMA accumulation.
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Odetti P, Traverso N, Monacelli F, Menini S, Vazzana J, Tasso B, Pronzato MA, Robaudo C, Deferrari G. Vitamin E-coated filter decreases levels of free 4-hydroxyl-2-nonenal during haemodialysis sessions. Free Radic Res 2009; 40:207-12. [PMID: 16390830 DOI: 10.1080/10715760500445121] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Uraemic subjects undergoing chronic haemodialysis show increased oxidative stress. The use of non-biocompatible filters and reduced antioxidative defences are important sources of reactive oxygen species (ROS) release. The highly oxidative environment accelerates the onset and progression of tissue damage and atherosclerotic cardiovascular disease. The aldehyde 4-hydroxyl-2-nonenal (HNE) is probably the best marker of oxidative stress. In this study, the concentration of plasma HNE was evaluated in eight uremic subjects during two sessions of haemodialysis: the first using a standard biocompatible filter and the second using a filter coated with vitamin E. Baseline plasma levels of HNE were elevated, and dropped during haemodialysis. At the end of the session, however, low levels were maintained only when the vitamin E-modified filter was used. By contrast, a marked increase in HNE was recorded at the end of the session in all subjects who underwent haemodialysis with the conventional filter. This study provides evidence that the vitamin E-coated filter plays a role in counteracting oxidative stress. The chronic use of vitamin E-modified filters in haemodialysed subjects might help to counterbalance oxidative attack and, consequently, contribute to preventing cardiovascular disease.
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Affiliation(s)
- Patrizio Odetti
- University of Genoa, Department of Internal Medicine and Medical Specialities, Genova, Italy.
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18
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Ultrafiltration for heart failure: how fast should we move? Am Heart J 2009; 157:205-7. [PMID: 19185626 DOI: 10.1016/j.ahj.2008.09.019] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/09/2008] [Accepted: 09/26/2008] [Indexed: 11/22/2022]
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Meerwaldt R, Zeebregts CJ, Navis G, Hillebrands JL, Lefrandt JD, Smit AJ. Accumulation of Advanced Glycation End Products and Chronic Complications in ESRD Treated by Dialysis. Am J Kidney Dis 2009; 53:138-50. [DOI: 10.1053/j.ajkd.2008.08.031] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2008] [Accepted: 08/29/2008] [Indexed: 02/03/2023]
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Tochihara Y, Whiting MJ, Barbara JA, Mangoni AA. Effects of pre- vs. intra-dialysis folic acid on arterial wave reflections and endothelial function in patients with end-stage renal disease. Br J Clin Pharmacol 2008; 66:717-22. [PMID: 18754845 DOI: 10.1111/j.1365-2125.2008.03262.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND Haemodialysis (HD) is associated with the acute loss through the dialysis membrane of biochemical factors either enhancing [folic acid (F)] or impairing [asymmetric dimethylarginine (ADMA)] arterial function. Changes in these opposing factors might explain the absence of significant modifications in arterial function during HD. We speculated that intra-HD, instead of pre-HD, F administration would provide beneficial effects on arterial wave reflections and endothelial function by preventing HD-induced F loss. METHODS Arterial wave reflections [augmentation index (AIx), pulse-wave analysis], endothelium-dependent vasodilation (salbutamol-mediated changes in AIx) and plasma concentrations of F and ADMA were measured pre-HD and end-HD in 10 patients (age 67.7 +/- 10.3 years). Each subject received F 5 mg either pre-HD or intra-HD in two separate studies 2-4 weeks apart, in an open-label randomized cross-over trial. RESULTS Pre-HD F administration did not prevent significant reductions in F during HD (end-HD vs. pre-HD, -865 +/- 465 nmol l(-1), P < 0.001), but no significant changes in AIx (+1.4 +/- 5.7%) or salbutamol-mediated AIx modifications (+0.4 +/- 5.5%) were observed. By contrast, intra-HD F administration was associated with significant increases in F (+298 +/- 283 nmol l(-1), P = 0.010) and a significant reduction of AIx (-4.7 +/- 7.2%, P = 0.013), but no effects on salbutamol-mediated AIx changes (+1.5 +/- 4.4%). There was a trend towards greater HD-induced reductions in plasma ADMA concentrations with intra-HD F administration (P = 0.066). CONCLUSIONS Intra-HD F administration reduces arterial wave reflections but not endothelial function during HD. Given the prognostic significance of arterial wave reflections in HD patients, the timing of F administration is important in the design of interventional trials in this cohort.
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Affiliation(s)
- Yuka Tochihara
- Department of Clinical Pharmacology, Flinders University and Flinders Medical Centre, Adelaide, Australia
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21
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Zanetti M, Barazzoni R, Guarnieri G. Inflammation and insulin resistance in uremia. J Ren Nutr 2008; 18:70-5. [PMID: 18089448 DOI: 10.1053/j.jrn.2007.10.015] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Low-grade systemic inflammation is an important potential factor in the pathogenesis of insulin resistance in end-stage renal disease (ESRD). Insulin resistance and diabetes, characterized by impaired skeletal muscle glucose uptake or excess hepatic glucose production, are in turn relevant contributors to morbidity and mortality in ESRD patients. Oxidative stress is increased in ESRD, in conservative therapy as well as hemodialysis treatment. Recent evidence suggests that oxidative stress contributes, at least in part, to both inflammation and insulin resistance by modulating the production of proinflammatory cytokines and adipokines in monocytes and in adipose tissue. This review focuses on the pathogenesis of inflammation and oxidative stress, and the effects of their interplay on insulin resistance in ESRD.
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Affiliation(s)
- Michela Zanetti
- Clinica Medica, Department Clinical, Morphological, Technological Sciences, University of Trieste, Trieste, Italy
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22
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Chu PL, Chiu YL, Lin JW, Chen SI, Wu KD. Effects of low- and high-flux dialyzers on oxidative stress and insulin resistance. Blood Purif 2008; 26:213-20. [PMID: 18285698 DOI: 10.1159/000117440] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2007] [Accepted: 11/09/2007] [Indexed: 11/19/2022]
Abstract
BACKGROUND Cardiovascular disease (CVD) is the leading cause of mortality in patients with end-stage renal disease (ESRD). The cornerstone of high CVD incidence in ESRD patients is endothelial dysfunction which results from inflammation, oxidative stress and insulin resistance. Although various modalities of hemodialysis (HD) have been presumed to exert different effects on oxidative stress and insulin resistance, solid evidence is still lacking. METHODS 40 ESRD patients undergoing HD were prospectively enrolled and divided randomly into two groups. Patients in each group received either F8 HPS (low-flux) (Group A) or FX80 (high-flux) (Group B) as HD dialyzers for 2 consecutive months. Diet pattern and medications were kept as usual in both groups to avoid considerable blood glucose change during study period. Blood samples were taken at the start and end of the study. RESULTS A total of 38 patients (18 and 20 for Groups A and B, respectively) completed the study. Within each group, there was no change in adiponectin, plasma 8-iso-prostaglandin F(2)(alpha), high-sensitivity C-reactive protein, blood glucose and insulin after 2 months of treatment except a significant change of HOMA(IR) (p = 0.02) in high-flux group. The significant change of HOMA(IR) between the two groups (p = 0.017) mainly results from the parallel change of insulin between the two groups (p = 0.03). CONCLUSION For patients receiving HD, the high-flux dialyzer with synthetic polysulfone membranes fails to provide a better anti-inflammatory or antioxidative effect than the low-flux dialyzer; however, the high-flux dialyzer does significantly improve insulin resistance in this short-term study. This result implies that the high-flux dialyzer might provide better cardiovascular protection than the low-flux dialyzer. Therefore, the low-flux dialyzer might be considered for patients who only need short-term HD therapy. Regarding patients under long-term maintenance HD therapy, a high-flux dialyzer might be the choice of dialyzer.
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Affiliation(s)
- Pei-Lun Chu
- Duke University, Cell and Molecular Biology Program, Durham, NC, USA
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23
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Hewitson CL, Whiting MJ, Barbara JA, Mangoni AA. Acute effects of haemodialysis on biochemical modulators of endothelial function. J Intern Med 2007; 262:571-80. [PMID: 17949366 DOI: 10.1111/j.1365-2796.2007.01848.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVES To assess the acute effects of haemodialysis (HD) on biochemical factors modulating endothelial function. SETTING Academic medical centre. SUBJECTS Forty patients (age 63.5 +/- 2.2 years, mean +/- SEM) undergoing HD. INTERVENTIONS Folic acid (F), homocysteine (tHcy), asymmetric dimethylarginine (ADMA), high-sensitivity C-reactive protein (CRP) and malondialdehyde (MDA) were measured pre-HD, 1 h after commencing HD and within the last hour of HD (end-HD). Endothelium-dependent and -independent vasodilatation were measured by applanation tonometry (changes in augmentation index, AIx, postinhaled salbutamol and postsublingual nitroglycerin) in conjunction with biochemical measurements. RESULTS Marked reductions in serum F (616 +/- 73 vs. 273 +/- 30 nmol L(-1), P < 0.001), tHcy (16.3 +/- 0.7 vs. 11.2 +/- 0.5 micromol L(-1), P < 0.001) and ADMA (0.64 +/- 0.02 vs. 0.47 +/- 0.02 micromol L(-1), P < 0.001) occurred end-HD, whereas CRP and MDA levels did not significantly change. There was no significant change in endothelium-dependent vasodilatation, whereas endothelium-independent vasodilatation improved end-HD (-23.1 +/- 1.9 vs. -17.3 +/- 1.3%, P = 0.018). Regression analysis showed that both higher ADMA (P = 0.029) and lower F levels (P = 0.040) end-HD were determinants of reduced endothelium-dependent vasodilatation end-HD (R(2) = 0.23). CONCLUSIONS HD is associated with significant reductions in F, tHcy and ADMA serum concentrations. The lack of significant effects of HD on endothelium-dependent vasodilatation could be secondary to the concomitant loss of factors either enhancing (F) or impairing (ADMA) endothelial function.
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Affiliation(s)
- C L Hewitson
- Department of Clinical Pharmacology, Flinders University and Flinders Medical Centre, Adelaide, Australia
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24
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Westerweel PE, Hoefer IE, Blankestijn PJ, de Bree P, Groeneveld D, van Oostrom O, Braam B, Koomans HA, Verhaar MC. End-stage renal disease causes an imbalance between endothelial and smooth muscle progenitor cells. Am J Physiol Renal Physiol 2007; 292:F1132-40. [PMID: 17200161 DOI: 10.1152/ajprenal.00163.2006] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Patients with end-stage renal disease (ESRD) on hemodialysis have an increased risk of cardiovascular disease (CVD). Circulating endothelial progenitor cells (EPC) contribute to vascular regeneration and repair, thereby protecting against CVD. However, circulating smooth muscle progenitor cells (SPC) may contribute to adverse vascular remodeling. We hypothesized that an imbalance occurs between EPC and SPC in ESRD patients and sampled progenitor cells from 45 ESRD patients receiving regular treatment. Our study is the first to show reduced numbers of CD34+KDR+ hematopoietic stem cell (HSC)-derived EPC (type I EPC). Furthermore, monocyte-derived EPC cultured from mononuclear cells (type II EPC) were reduced in number and had a reduced capacity to stimulate endothelial cell angiogenesis. In contrast, SPC outgrowth was unaffected. In vitro incubation with uremic serum impaired type II EPC outgrowth from healthy donor mononuclear cells and did not influence SPC outgrowth. The hemodialysis procedure itself induced HSC apoptosis and caused an acute depletion of circulating EPC. Taken together, the decreased number and impaired function of EPC are compatible with impaired endogenous vascular repair in hemodialysis patients, whereas the unaffected SPC numbers suggest that the potential of progenitor cells to contribute to adverse remodeling is retained. This EPC-SPC imbalance may contribute to the acceleration of CVD in ESRD patients and could offer novel therapeutic targets.
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Affiliation(s)
- Peter E Westerweel
- Dept. of Vascular Medicine, F02.126, Univ. Medical Center Utrecht, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands
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Yigla M, Abassi Z, Reisner SA, Nakhoul F. Pulmonary Hypertension in Hemodialysis Patients: An Unrecognized Threat. Semin Dial 2006; 19:353-7. [PMID: 16970730 DOI: 10.1111/j.1525-139x.2006.00186.x] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Pulmonary hypertension (PH) is a progressive, fatal pulmonary circulatory disease that accompanies many conditions (including left to right side shunt) with compensatory elevated cardiac output. PH also complicates chronic hemodialysis (HD) therapy immediately after the creation of an arteriovenous (AV) access, even before starting HD therapy. It tends to regress after temporary AV access closure and after successful kidney transplantation. Affected patients have significantly higher cardiac output. This syndrome is associated with a statistically significant survival disadvantage. The laboratory hallmark of this syndrome is reduced basal and stimulatory nitric oxide (NO) levels. It appears that patients with end-stage renal disease (ESRD) acquire endothelial dysfunction that reduces the ability of their pulmonary vessels to accommodate the AV access-mediated elevated cardiac output, exacerbating the PH. Doppler echocardiographic screening of ESRD patients scheduled for HD therapy for the occurrence of PH is indicated. Early diagnosis enables timely intervention, currently limited to changing dialysis modality or referring for kidney transplantation.
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Affiliation(s)
- Mordechai Yigla
- Division of Pulmonary Medicine and Department of Physiology, Rambam Medical Center, and B. Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
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Abstract
It is being increasingly recognized that cardiovascular disease (CVD) and its complications are the most important cause of morbidity and mortality in patients with chronic kidney disease (CKD) and dialysis patients. If outcomes for these patients are to be improved, therapeutic strategies at all stages of CKD will have to target the etiologies and mechanisms that lead to CVD. In this review, we focus on the central role of endothelial dysfunction as the critical precursor of CVD. We argue that a better understanding of endothelial dysfunction by nephrologists and dialysis physicians is necessary if there is to be success in limiting the CVD epidemic that kills and maims our patients. The extensive studies to explain the high prevalence of vascular disease in patients with CKD have shown the close relationship among endothelial dysfunction, inflammation, and atherosclerosis. The pathogenesis starts with endothelial cell injury from any of many possible causes, and strategies to reduce the burden of CVD in uremic and dialysis patients must be directed at restoring normal endothelial function or, at the least, preventing aggravation of endothelial damage. At the center of the exploration of endothelial dysfunction and atherosclerosis are oxidative stress and inflammation. Of these, which is the chicken and which is the egg is unknown, but in the setting of uremia, endothelial injury because of free radical, oxidative stress is likely to precede inflammation. The issues raised here are highly complex and most renal practitioners may not have been adequately exposed to the background research underlying current thinking of the pathogenesis of vascular disease. Clearly, progress in management of CVD in patients with CKD will require collaboration with experts in the research and treatment of vascular disease. Nephrologists seeking optimum outcomes for patients with CKD will need to become "endotheliologists" or, at the least, subscribe to a mission "to protect the endothelium."
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Affiliation(s)
- Jose A Diaz-Buxo
- Fresenius Medical Care North America, Lexington, Massachusetts, USA.
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Wu CC, Chen JS, Wu WM, Liao TN, Chu P, Lin SH, Chuang CH, Lin YF. Myeloperoxidase serves as a marker of oxidative stress during single haemodialysis session using two different biocompatible dialysis membranes. Nephrol Dial Transplant 2005; 20:1134-9. [PMID: 15814542 DOI: 10.1093/ndt/gfh764] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND There is increased oxidative stress in patients undergoing haemodialysis (HD); however, little is known of how different dialysis membranes contribute to the oxidative stress induced by the dialysis procedure per se. We therefore studied the influence of two different dialysis membranes on oxidative stress during HD. METHODS Eight patients undergoing HD three times per week were enrolled in this cross-controlled study. Patients sequentially received HD using polysulphone (PS) and regenerated cellulose (RC) dialysis membranes for 1 week each. Blood samples were collected in the last section of each hollow fibre 0, 15, 120 and 240 min after starting HD. We determined superoxide anion production derived from neutrophils, superoxide dismutase (SOD) and glutathione peroxidase (GPx) derived from washed red cells, plasma myeloperoxidase (MPO), plasma thiobarbituric acid-reactive substances (TBARS), plasma advanced oxidation protein products (AOPP) and serum 8-hydroxy-2'-deoxyguanosine (8-OHdG). RESULTS Leukocyte numbers, including neutrophils, lymphocytes and monocytes, decreased significantly after 15 min of dialysis, more so with RC than with PS membrane. For both membranes, superoxide anion production transiently increased during the first 15 min whereas the post-dialysis production was decreased. Plasma MPO levels persistently increased during dialysis with the two membranes. Moreover, the increase was more marked with RC than with PS membrane. AOPP and 8-OHdG levels increased progressively when using RC membranes. There were no significant differences in SOD, GPx, TBARS, AOPP and 8-OHdG levels between the two membranes. CONCLUSIONS The biocompatibility of the dialyser affects oxidative stress production during a single dialysis session. The measurement of MPO may serve as a reliable marker of the degree of oxidative stress induced using dialysis membranes of different biocompatibilities.
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Affiliation(s)
- Chia-Chao Wu
- Graduate Institute of Medical Sciences, National Defense Medical Center, Taipei, Taiwan
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Lilien MR, Koomans HA, Schröder CH. Hemodialysis acutely impairs endothelial function in children. Pediatr Nephrol 2005; 20:200-4. [PMID: 15627169 DOI: 10.1007/s00467-004-1718-3] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2004] [Revised: 08/31/2004] [Accepted: 09/14/2004] [Indexed: 10/26/2022]
Abstract
Cardiovascular disease is the main cause of death for patients with end-stage renal disease (ESRD), including young adults. The appearance of endothelial dysfunction is an early stage in the development of atherosclerosis. There are conflicting data on the effect of hemodialysis on endothelial function in adults, but there are no studies in children. This study compares endothelial function of children on hemodialysis with healthy controls and describes the effect of a regular dialysis session on endothelial function. We studied 10 healthy children and 10 children on dialysis, before and after a regular midweek hemodialysis session. Endothelial function was studied non-invasively with ultrasound equipment as the percentage of post-ischemic flow-mediated dilation (FMD) of the brachial artery. In children on dialysis, FMD was 6.0+/-4.1%, while it was 14.2+/-5.8% in healthy controls (P=0.002). Hemodialysis induced a further decrease of FMD to 1.8+/-2.7% (P=0.003). Baseline diameter or distensibility of the brachial artery did not change. Systolic blood pressure, mean arterial pressure, and pulse pressure decreased, while diastolic blood pressure and heart rate did not change. This study demonstrates that children on hemodialysis have endothelial dysfunction. A hemodialysis procedure induces further endothelial dysfunction in children with ESRD. This repeated insult on the endothelium with maintenance hemodialysis may contribute to the cardiovascular risk of these children.
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Affiliation(s)
- Marc R Lilien
- Department of Pediatric Nephrology, University Medical Center Utrecht, PO Box 80590, 3508 CA Utrecht, The Netherlands.
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30
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Vlatković V. Improvement of hemodialysis quality by application of various models for adequacy aseessment. SCRIPTA MEDICA 2004. [DOI: 10.5937/scrimed0402099x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
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