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Freemas JA, Worley ML, Gabler MC, Hess HW, Goss CS, Baker TB, Johnson BD, Chapman CL, Schlader ZJ. Renal vascular control during normothermia and passive heat stress does not differ between healthy younger men and women. Am J Physiol Renal Physiol 2024; 326:F802-F813. [PMID: 38545652 DOI: 10.1152/ajprenal.00034.2024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Revised: 03/18/2024] [Accepted: 03/19/2024] [Indexed: 05/04/2024] Open
Abstract
Men are likely at greater risk for heat-induced acute kidney injury compared with women, possibly due to differences in vascular control. We tested the hypothesis that the renal vasoconstrictor and vasodilator responses will be greater in younger women compared with men during passive heat stress. Twenty-five healthy adults [12 women (early follicular phase) and 13 men] completed two experimental visits, heat stress or normothermic time-control, assigned in a block-randomized crossover design. During heat stress, participants wore a water-perfused suit perfused with 50°C water. Core temperature was increased by ∼0.8°C in the first hour before commencing a 2-min cold pressor test (CPT). Core temperature remained clamped and at 1-h post-CPT, subjects ingested a whey protein shake (1.2 g of protein/kg body wt), and measurements were taken pre-, 75 min, and 150 min post-protein. Beat-to-beat blood pressure (Penaz method) was measured and segmental artery vascular resistance (VR, Doppler ultrasound) was calculated as segmental artery blood velocity ÷ mean arterial pressure. CPT-induced increases in segmental artery VR did not differ between trials (trial effect: P = 0.142) nor between men (heat stress: 1.5 ± 1.0 mmHg/cm/s, normothermia: 1.4 ± 1.0 mmHg/cm/s) and women (heat stress: 1.4 ± 1.2 mmHg/cm/s, normothermia: 2.1 ± 1.1 mmHg/cm/s) (group effect: P = 0.429). Reductions in segmental artery VR following oral protein loading did not differ between trials (trial effect: P = 0.080) nor between men (heat stress: -0.6 ± 0.8 mmHg/cm/s, normothermia: -0.6 ± 0.6 mmHg/cm/s) and women (heat stress: -0.5 ± 0.5 mmHg/cm/s, normothermia: -1.1 ± 0.6 mmHg/cm/s) (group effect: P = 0.204). Renal vasoconstrictor responses to the cold pressor test and vasodilator responses following an oral protein load during heat stress or normothermia do not differ between younger men and younger women in the early follicular phase of the menstrual cycle.NEW & NOTEWORTHY The mechanisms underlying greater heat-induced acute kidney injury risk in men versus women remain unknown. This study examined renal vascular control, including both vasodilatory (oral protein load) and vasoconstrictor (cold presser test) responses, during normothermia and heat stress and compared these responses between men and women. The results indicated that in both conditions neither renal vasodilatory nor vasoconstrictor responses differ between younger men and younger women.
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Affiliation(s)
- Jessica A Freemas
- Department of Kinesiology, H.H. Morris Human Performance Laboratories, Indiana University School of Public Health, Bloomington, Indiana, United States
| | - Morgan L Worley
- Department of Exercise and Nutrition Sciences, Center for Research and Education in Special Environments, University at Buffalo, Buffalo, New York, United States
| | - Mikaela C Gabler
- Department of Kinesiology, H.H. Morris Human Performance Laboratories, Indiana University School of Public Health, Bloomington, Indiana, United States
| | - Hayden W Hess
- Department of Kinesiology, H.H. Morris Human Performance Laboratories, Indiana University School of Public Health, Bloomington, Indiana, United States
- Department of Exercise and Nutrition Sciences, Center for Research and Education in Special Environments, University at Buffalo, Buffalo, New York, United States
| | - Curtis S Goss
- Department of Kinesiology, H.H. Morris Human Performance Laboratories, Indiana University School of Public Health, Bloomington, Indiana, United States
| | - Tyler B Baker
- Department of Kinesiology, H.H. Morris Human Performance Laboratories, Indiana University School of Public Health, Bloomington, Indiana, United States
| | - Blair D Johnson
- Department of Kinesiology, H.H. Morris Human Performance Laboratories, Indiana University School of Public Health, Bloomington, Indiana, United States
| | - Christopher L Chapman
- Thermal and Mountain Medicine Division, United States Army Research Institute of Environmental Medicine, Natick, Massachusetts, United States
- Military Performance Division, United States Army Research Institute of Environmental Medicine, Natick, Massachusetts, United States
- Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee, United States
| | - Zachary J Schlader
- Department of Kinesiology, H.H. Morris Human Performance Laboratories, Indiana University School of Public Health, Bloomington, Indiana, United States
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Taylor KM, Au AYM, Herath S, Succar L, Wong J, Erlich JH, Endre ZH. Kidney functional reserve and damage biomarkers in subclinical chronic kidney disease and acute kidney injury. Am J Physiol Renal Physiol 2023; 325:F888-F898. [PMID: 37733876 DOI: 10.1152/ajprenal.00133.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Revised: 09/01/2023] [Accepted: 09/15/2023] [Indexed: 09/23/2023] Open
Abstract
Significant loss of kidney function is not easily identified by serum creatinine (sCr)-based measurements. In the presence of normal sCr, decreased kidney functional reserve (KFR) may identify a significant loss of function. We evaluated KFR in experimental subclinical chronic kidney disease (sCKD) before and after brief ischemia-reperfusion injury (IRI). Using fluorescein isothiocyanate-labeled sinistrin, glomerular filtration rate (GFR) was measured transcutaneously before and after adenine-induced sCKD, and 1 and 2 wk after brief IRI, and compared with urinary kidney damage biomarkers. sCKD reduced stimulated and unstimulated GFR by ∼20% while reducing KFR by 50%. IRI reduced unstimulated GFR for 14 days, but KFR remained relatively unchanged in sCKD and transiently increased in control kidneys at 7 days. sCr increased and creatinine clearance (CrCl) decreased only immediately after IRI; sCr and CrCl correlated poorly with measured GFR except on day 1 after IRI. Heterogeneity in sCr and CrCl resulted from variation in tubular creatinine secretion. The increase in damage biomarker concentrations persisted for up to 14 days after IRI, allowing retrospective detection of sCKD before AKI by urine clusterin/urine kidney injury molecule-1 with an area under the curve of 1.0. sCr and CrCl are unreliable unless sCr is acutely elevated. Measurement of KFR and urine damage biomarker excretion detected sCKD despite normal sCr and CrCl. After IRI, the urine clusterin-to-urine kidney injury molecule-1 ratio may identify prior sCKD.NEW & NOTEWORTHY Early kidney function loss is poorly identified by serum creatinine (sCr)-based measurements. Direct kidney functional reserve (KFR) measurement before kidney injury and elevated urinary biomarkers clusterin and kidney injury molecule-1 detect subclinical chronic kidney disease (sCKD) after kidney injury despite normal range sCr and creatinine clearance. Reliance on sCr masks underlying sCKD. Acute kidney injury risk evaluation requires direct glomerular filtration rate measurement and KFR, whereas kidney damage biomarkers facilitate identification of prior subclinical injury.
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Affiliation(s)
- Kylie M Taylor
- Faculty of Medicine and Health, School of Clinical Medicine, University of New South Wales, Sydney, New South Wales, Australia
| | - Amy Y M Au
- Faculty of Medicine and Health, School of Clinical Medicine, University of New South Wales, Sydney, New South Wales, Australia
- Department of Nephrology, Prince of Wales Hospital, Sydney, New South Wales, Australia
| | - Sanjeeva Herath
- Faculty of Medicine and Health, School of Clinical Medicine, University of New South Wales, Sydney, New South Wales, Australia
| | - Lena Succar
- Faculty of Medicine and Health, School of Clinical Medicine, University of New South Wales, Sydney, New South Wales, Australia
| | - Jasmine Wong
- Department of Nephrology, Prince of Wales Hospital, Sydney, New South Wales, Australia
| | - Jonathan H Erlich
- Faculty of Medicine and Health, School of Clinical Medicine, University of New South Wales, Sydney, New South Wales, Australia
- Department of Nephrology, Prince of Wales Hospital, Sydney, New South Wales, Australia
| | - Zoltán H Endre
- Faculty of Medicine and Health, School of Clinical Medicine, University of New South Wales, Sydney, New South Wales, Australia
- Department of Nephrology, Prince of Wales Hospital, Sydney, New South Wales, Australia
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De Moor B, Sprangers B. Testing the functional reserve of the kidney before hematopoietic stem cell transplantation: doubt remains. Clin Kidney J 2023; 16:905-908. [PMID: 37261006 PMCID: PMC10229275 DOI: 10.1093/ckj/sfad078] [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: 02/02/2023] [Indexed: 06/02/2023] Open
Abstract
Acute kidney injury is a common and important complication following hematopoietic stem cell transplantation. In the nephrology community, acute kidney injury is no longer viewed as a simple temporary and potentially reversible decline in kidney clearance as acute kidney injury imposes a risk for immediate and future complications. Therefore, stratifying patients for the risk of acute kidney injury following stem cell transplantation would be very helpful to optimize peri-stem cell transplant management and could potentially improve outcomes in this patient population. In the current issue of CKJ, Mancianti et al. report on the testing of the kidney's functional reserve in patients planned for stem cell transplantation and demonstrate that stem cell transplant candidates with a preserved kidney response on a protein load had a higher chance of full kidney recovery after an episode of acute kidney injury. In this editorial, we discuss the kidney's functional reserve test and its limitations.
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Affiliation(s)
| | - Ben Sprangers
- Biomedical Research Institute, Department of Immunology and Infection, UHasselt, Diepenbeek, Belgium
- Department of Nephrology, Ziekenhuis Oost Limburg, Genk, Belgium
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Lillås BS, Tøndel C, Melsom T, Eriksen BO, Marti HP, Vikse BE. Renal Functional Response-Association With Birth Weight and Kidney Volume. Kidney Int Rep 2023; 8:1034-1042. [PMID: 37180504 PMCID: PMC10166784 DOI: 10.1016/j.ekir.2023.02.1079] [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: 11/15/2022] [Revised: 02/03/2023] [Accepted: 02/13/2023] [Indexed: 02/22/2023] Open
Abstract
Introduction Renal functional response (RFR) is the acute increase in glomerular filtration rate (GFR) after a protein load. Low RFR is a marker of single nephron hyperfiltration. Low birth weight (LBW) is associated with reduced number of nephrons, lower kidney function, and smaller kidneys in adults. In the present study, we investigate the associations among LBW, kidney volume, and RFR. Methods We studied adults aged 41 to 52 years born with either LBW (≤2300 g) or normal birth weight (NBW; 3500-4000 g). GFR was measured using plasma clearance of iohexol. A stimulated GFR (sGFR) was measured on a separate day after a protein load of 100 g using a commercially available protein powder, and RFR was calculated as delta GFR. Kidney volume was estimated from magnetic resonance imaging (MRI) images using the ellipsoid formula. Results A total of 57 women and 48 men participated. The baseline mean ± SD GFR was 118 ± 17 ml/min for men and 98 ± 19 ml/min for women. The overall mean RFR was 8.2 ± 7.4 ml/min, with mean RFR of 8.3 ± 8.0 ml/min and 8.1 ± 6.9 ml/min in men and women, respectively (P = 0.5). No birth-related variables were associated with RFR. Larger kidney volume was associated with higher RFR, 1.9 ml/min per SD higher kidney volume (P = 0.009). Higher GFR per kidney volume was associated with a lower RFR, -3.3ml/min per SD (P < 0.001). Conclusion Larger kidney size and lower GFR per kidney volume were associated with higher RFR. Birth weight was not shown to associate with RFR in mainly healthy middle-aged men and women.
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Affiliation(s)
- Bjørn Steinar Lillås
- Department of Medicine, Haugesund Hospital, Haugesund, Norway
- Department of Clinical Medicine, University of Bergen, Bergen, Norway
| | - Camilla Tøndel
- Department of Clinical Medicine, University of Bergen, Bergen, Norway
- Department of Pediatrics, Haukeland University Hospital, Bergen, Norway
| | - Toralf Melsom
- Metabolic and Renal Research group, UiT The Arctic University of Norway, Tromsø, Norway
- Section of Nephrology, University Hospital of North Norway, Tromsø, Norway
| | - Bjørn Odvar Eriksen
- Metabolic and Renal Research group, UiT The Arctic University of Norway, Tromsø, Norway
- Section of Nephrology, University Hospital of North Norway, Tromsø, Norway
| | - Hans-Peter Marti
- Department of Clinical Medicine, University of Bergen, Bergen, Norway
- Department of Medicine, Haukeland University Hospital, Bergen, Norway
| | - Bjørn Egil Vikse
- Department of Medicine, Haugesund Hospital, Haugesund, Norway
- Department of Clinical Medicine, University of Bergen, Bergen, Norway
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Freemas JA, Worley ML, Gabler MC, Hess HW, Mcdeavitt J, Baker TB, Johnson BD, Chapman CL, Schlader ZJ. Glomerular filtration rate reserve is reduced during mild passive heat stress in healthy young adults. Am J Physiol Regul Integr Comp Physiol 2022; 323:R340-R350. [PMID: 35816723 PMCID: PMC9423723 DOI: 10.1152/ajpregu.00090.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 06/16/2022] [Accepted: 07/07/2022] [Indexed: 11/22/2022]
Abstract
We tested the hypothesis that, compared with normothermia, the increase in glomerular filtration rate (GFR) after an oral protein load (defined as the GFR reserve) is attenuated during moderate passive heat stress in young healthy adults. Sixteen participants (5 women; 26 ± 2 yr) completed two experimental visits, heat stress or a normothermic time-control, assigned in a block-randomized crossover design. During the heat stress trial, core temperature was increased by 0.6°C in the first hour before commencing a 2-min cold pressor test (CPT) to assess renal vasoconstrictor responses. One-hour post-CPT, subjects ingested a whey protein shake (1.2 g of protein/kg body wt), and measurements were taken pre-, 75, and 150 min postprotein. Segmental artery vascular resistance was calculated as the quotient of Doppler ultrasound-derived segmental artery blood velocity and mean arterial pressure and provided an estimate of renal vascular tone. GFR was estimated from creatinine clearance. The increase in segmental artery vascular resistance during the CPT was attenuated during heat stress (end CPT: 5.6 ± 0.9 vs. 4.7 ± 1.1 mmHg/cm/s, P = 0.024). However, the reduction in segmental artery vascular resistance in response to an oral protein load did not differ between heat stress (at 150 min: 1.9 ± 0.4 mmHg/cm/s) and normothermia (at 150 min: 1.8 ± 0.5 mmHg/cm/s; P = 0.979). The peak increase in creatinine clearance postprotein, independent of time, was attenuated during heat stress (+26 ± 19 vs. +16 ± 20 mL/min, P = 0.013, n = 13). GFR reserve is diminished by mild passive heat stress. Moreover, renal vasoconstrictor responses are attenuated by mild passive heat stress, but renal vasodilator responses are maintained.
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Affiliation(s)
- Jessica A Freemas
- H.H. Morris Human Performance Laboratories, Department of Kinesiology, School of Public Health, Indiana University, Bloomington, Indiana
| | - Morgan L Worley
- Department of Exercise and Nutrition Sciences, Center for Research and Education in Special Environments, University at Buffalo, Buffalo, New York
| | - Mikaela C Gabler
- H.H. Morris Human Performance Laboratories, Department of Kinesiology, School of Public Health, Indiana University, Bloomington, Indiana
| | - Hayden W Hess
- H.H. Morris Human Performance Laboratories, Department of Kinesiology, School of Public Health, Indiana University, Bloomington, Indiana
| | - Jovi Mcdeavitt
- H.H. Morris Human Performance Laboratories, Department of Kinesiology, School of Public Health, Indiana University, Bloomington, Indiana
| | - Tyler B Baker
- H.H. Morris Human Performance Laboratories, Department of Kinesiology, School of Public Health, Indiana University, Bloomington, Indiana
| | - Blair D Johnson
- H.H. Morris Human Performance Laboratories, Department of Kinesiology, School of Public Health, Indiana University, Bloomington, Indiana
| | - Christopher L Chapman
- Department of Human Physiology, Bowerman Sports Science Center, University of Oregon, Eugene, Oregon
| | - Zachary J Schlader
- H.H. Morris Human Performance Laboratories, Department of Kinesiology, School of Public Health, Indiana University, Bloomington, Indiana
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Poznyak AV, Sadykhov NK, Kartuesov AG, Borisov EE, Sukhorukov VN, Orekhov AN. Atherosclerosis Specific Features in Chronic Kidney Disease (CKD). Biomedicines 2022; 10:biomedicines10092094. [PMID: 36140195 PMCID: PMC9495595 DOI: 10.3390/biomedicines10092094] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 08/20/2022] [Accepted: 08/22/2022] [Indexed: 11/25/2022] Open
Abstract
Atherosclerosis is the major cause of cardiovascular disease, leading to a high mortality rate worldwide. Several risk factors are known to favor atherogenesis, among which are high blood pressure, smoking, diabetes mellitus, and others. Chronic kidney disease is another serious health problem associated with significant health care costs, morbidity, and mortality. Chronic kidney disease shares several risk factors with atherosclerosis and cardiovascular diseases, such as hypertension and diabetes mellitus. Additional risk factors for cardiovascular disease development should be considered in patients with chronic kidney disease. Interestingly, patients suffering from chronic kidney disease are more prone to cardiovascular problems than the general population. Moreover, chronic kidney disease is characterized by an increased atherosclerotic burden from the very early stages. The purpose of this review was to summarize data on atherosclerosis in chronic kidney disease, highlighting the specific features of the disease combination.
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Affiliation(s)
- Anastasia V. Poznyak
- Institute for Atherosclerosis Research, Osennyaya 4-1-207, 121609 Moscow, Russia
- Correspondence: (A.V.P.); (A.N.O.)
| | - Nikolay K. Sadykhov
- Laboratory of Angiopathology, Institute of General Pathology and Pathophysiology, 8 Baltiiskaya Street, 125315 Moscow, Russia
| | - Andrey G. Kartuesov
- Laboratory of Angiopathology, Institute of General Pathology and Pathophysiology, 8 Baltiiskaya Street, 125315 Moscow, Russia
| | - Evgeny E. Borisov
- Petrovsky National Research Centre of Surgery, Abrikosovsky Lane, 119991 Moscow, Russia
| | - Vasily N. Sukhorukov
- Institute for Atherosclerosis Research, Osennyaya 4-1-207, 121609 Moscow, Russia
- Petrovsky National Research Centre of Surgery, Abrikosovsky Lane, 119991 Moscow, Russia
| | - Alexander N. Orekhov
- Institute for Atherosclerosis Research, Osennyaya 4-1-207, 121609 Moscow, Russia
- Laboratory of Angiopathology, Institute of General Pathology and Pathophysiology, 8 Baltiiskaya Street, 125315 Moscow, Russia
- Petrovsky National Research Centre of Surgery, Abrikosovsky Lane, 119991 Moscow, Russia
- Correspondence: (A.V.P.); (A.N.O.)
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Molitoris BA. Low-Flow Acute Kidney Injury: The Pathophysiology of Prerenal Azotemia, Abdominal Compartment Syndrome, and Obstructive Uropathy. Clin J Am Soc Nephrol 2022; 17:1039-1049. [PMID: 35584927 PMCID: PMC9269622 DOI: 10.2215/cjn.15341121] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
AKI is a syndrome, not a disease. It results from many different primary and/or secondary etiologies and is often multifactorial, especially in the hospitalized patient. This review discusses the pathophysiology of three etiologies that cause AKI, those being kidney hypoperfusion, abdominal compartment syndrome, and urinary tract obstruction. The pathophysiology of these three causes of AKI differs but is overlapping. They all lead to a low urine flow rate and low urine sodium initially. In all three cases, with early recognition and correction of the underlying process, the resulting functional AKI can be rapidly reversed. However, with continued duration and/or increased severity, cell injury occurs within the kidney, resulting in structural AKI and a longer and more severe disease state with increased morbidity and mortality. This is why early recognition and reversal are critical.
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Affiliation(s)
- Bruce A Molitoris
- Division of Nephrology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana, and Department of Anatomy, Cell Biology and Integrative Physiology, Indiana University School of Medicine, Indianapolis, Indiana
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McArdle Z, Singh R, Bielefeldt-Ohmann H, Moritz K, Schreuder M, Denton K. Brief Early Life Angiotensin Converting Enzyme Inhibition Offers Reno-Protection in Sheep with a Solitary Functioning Kidney at 8 Months of Age. J Am Soc Nephrol 2022; 33:1341-1356. [PMID: 35351818 PMCID: PMC9257814 DOI: 10.1681/asn.2021111534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 03/18/2022] [Indexed: 11/03/2022] Open
Abstract
Background: Children born with a solitary functioning kidney (SFK) are predisposed to develop hypertension and kidney injury. Glomerular hyperfiltration and hypertrophy contribute to the pathophysiology of kidney injury. Angiotensin converting enzyme inhibitors (ACEi) can mitigate hyperfiltration and may be therapeutically beneficial in reducing progression of kidney injury in SFK. Methods: SFK was induced in male sheep fetuses at 100 days gestation (term=150 day). Between 4-8 weeks of age, SFK lambs received enalapril (SFK+ACEi; 0.5mg/kg/day, once daily, orally) or vehicle (SFK). At 8 months we examined whether SFK+ACEi reduced elevation in blood pressure (BP) and improved basal kidney function, renal functional reserve (RFR; glomerular filtration rate (GFR) response to combined amino acid and dopamine infusion), GFR response to nitric oxide synthase (NOS) inhibition and basal nitric oxide (NO) bioavailability (basal urinary total nitrate+nitrite (NOx)). Results: SFK+ACEi prevented albuminuria, resulted in lower basal GFR (16%), higher renal blood flow (~22%), and lower filtration fraction ( 35%), but similar BP compared to ~ vehicle-treated SFK sheep. Together with greater recruitment of RFR (~14%) in SFK+ACEi animals than SFK, this indicates reduction in glomerular hyperfiltration-mediated kidney dysfunction. During NOS inhibition, the decrease in GFR ( 14%) was greater among SFK+ACEi than among SFK animals. Increased ( 85%) basal urinary total NOx in SFK+ACEi animals compared to SFK indicates elevated NO bioavailability likely contributing to improvements in kidney function and prevention of albuminuria. Conclusions: Brief and early ACEi in SFK is associated with reduced glomerular hyperfiltration-mediated kidney disease up to 8 months of age in a sheep model.
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Affiliation(s)
- Zoe McArdle
- Z McArdle, Cardiovascular Program, Monash Biomedicine Discovery Institute and Department of Physiology, Monash University, Clayton, Australia
| | - Reetu Singh
- R Singh, Cardiovascular Program, Monash Biomedicine Discovery Institute and Department of Physiology, Monash University, Clayton, Australia
| | - Helle Bielefeldt-Ohmann
- H Bielefeldt-Ohmann, School of Veterinary Science, The University of Queensland, Gatton, Australia
| | - Karen Moritz
- K Moritz, Child Health Research Centre and School of Biomedical Sciences, The University of Queensland, Saint Lucia, Australia
| | - Michiel Schreuder
- M Schreuder, Department of Pediatric Nephrology , Amalia Children's Hospital, Nijmegen, Netherlands
| | - Kate Denton
- K Denton, Cardiovascular Program, Monash Biomedicine Discovery Institute and Department of Physiology, Monash University, Clayton, Australia
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9
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Azawi N, Jensen M, Jensen BL, Goetze JP, Bistrup C, Lund L. Functional adaptation after kidney tissue removal in patients is associated with increased plasma atrial natriuretic peptide concentration. Nephrol Dial Transplant 2021; 37:2138-2149. [PMID: 34792174 DOI: 10.1093/ndt/gfab327] [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: 06/25/2021] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Following nephrectomy, the remaining kidney tissue adapts by an increase in GFR. In rats, hyperfiltration can be transferred by plasma. We examined whether natriuretic peptides (ANP, BNP) increase in plasma proportionally with kidney mass reduction and, if so, whether the increase relates to an increase in GFR. METHODS Patients (n = 54) undergoing partial or total unilateral nephrectomy at two Danish centers were followed for one year in an observational study. Glomerular filtration rate was measured before, 3, and 12 months after surgery. Natriuretic propeptides (proANP and proBNP) and aldosterone were measured in plasma before and at 24 hours, five days, 21 days, three months, and 12 months. Cyclic GMP was determined in urine. RESULTS There was no baseline difference in GFR between total- and partial nephrectomy (90.1 mL/min ±14.6 vs. 82.9±18, p = 0.16). Single-kidney GFR increased after 3 and 12 months (12.0 and 11.9 ml/min/1.73m2, +23.3%). There was no change in measured GFR 3 and 12 months after partial nephrectomy. ProANP and proBNP increased 3-fold 24h after surgery and returned to baseline after five days. The magnitude of acute proANP and proBNP increases did not relate to kidney mass removed. ProANP, not proBNP, increased 12 months after nephrectomy. Plasma aldosterone and urine cGMP did not change. Urine albumin/creatine ratio increased transiently after partial nephrectomy. Blood pressure was similar between groups. CONCLUSION ANP and BNP increase acutely in plasma with no relation to degree of kidney tissue ablation. After 1year, only unilateral nephrectomy patients display increased plasma ANP which could support adaptation.
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Affiliation(s)
- Nessn Azawi
- Department of Urology, Zealand University Hospital, Roskilde, Denmark.,Institute of clinical medicine, Copenhagen University, Denmark
| | - Mia Jensen
- Cardiovascular and renal research, Institute of Molecular Medicine, University of Southern Denmark, Denmark
| | - Boye L Jensen
- Cardiovascular and renal research, Institute of Molecular Medicine, University of Southern Denmark, Denmark.,Department of Urology, Odense University Hospital, Odense, Denmark
| | - Jens P Goetze
- Department of Clinical Biochemistry, Rigshospitalet, University of Copenhagen, Denmark
| | - Claus Bistrup
- Department of Nephrology, Odense University Hospital, Odense, Denmark.,Department of Clinical Research, University of Southern Denmark, Denmark
| | - Lars Lund
- Department of Urology, Odense University Hospital, Odense, Denmark.,Department of Clinical Research, University of Southern Denmark, Denmark
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10
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Chang-Panesso M. Acute kidney injury and aging. Pediatr Nephrol 2021; 36:2997-3006. [PMID: 33411069 PMCID: PMC8260619 DOI: 10.1007/s00467-020-04849-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 10/06/2020] [Accepted: 11/04/2020] [Indexed: 01/29/2023]
Abstract
Our aging population is growing and developing treatments for age-related diseases such as Alzheimer's and Parkinson's disease has taken on an increasing urgency and is accompanied by high public awareness. The already high and rising incidence of acute kidney injury (AKI) in the elderly, however, has received relatively little attention despite the potentially fatal outcomes associated with an episode of AKI in this age group. When discussing AKI and aging, one should consider two aspects: first, elderly patients have an increased susceptibility to an AKI episode, and second, they have decreased kidney repair after AKI given the high incidence of progression to chronic kidney disease (CKD). It is unclear if the same factors that drive the increased susceptibility to AKI could be playing a role in the decreased repair capacity or if they are totally different and unrelated. This review will examine current knowledge on the risk factors for the increased susceptibility to AKI in the elderly and will also explore potential aspects that might contribute to a decreased kidney repair response in this age group.
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11
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Real-time glomerular filtration rate: improving sensitivity, accuracy and prognostic value in acute kidney injury. Curr Opin Crit Care 2021; 26:549-555. [PMID: 33002974 DOI: 10.1097/mcc.0000000000000770] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
PURPOSE OF REVIEW Acute kidney injury (AKI) is common and associated with high patient mortality, and accelerated progression to chronic kidney disease. Our ability to diagnose and stratify patients with AKI is paramount for translational progress. Unfortunately, currently available methods have major pitfalls. Serum creatinine is an insensitive functional biomarker of AKI, slow to register the event and influenced by multiple variables. Cystatin C, a proposed alternative, requires long laboratory processing and also lacks specificity. Other techniques are either very cumbersome (inuline, iohexol) or involve administration of radioactive products, and are therefore, not applicable on a large scale. RECENT FINDINGS The development of two optical measurement techniques utilizing novel minimally invasive techniques to quantify kidney function, independent of serum or urinary measurements is advancing. Utilization of both one and two compartmental models, as well as continuous monitoring, are being developed. SUMMARY The clinical utility of rapid GFR measurements in AKI patients remains unknown as these disruptive technologies have not been tested in studies exploring clinical outcomes. However, these approaches have the potential to improve our understanding of AKI and clinical care. This overdue technology has the potential to individualize patient care and foster therapeutic success in AKI.
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Cantaluppi V, Guglielmetti G, Dellepiane S, Marengo M, Mehta RL, Ronco C. A call to action to evaluate renal functional reserve in patients with COVID-19. Am J Physiol Renal Physiol 2020; 319:F792-F795. [PMID: 32969711 PMCID: PMC7641895 DOI: 10.1152/ajprenal.00245.2020] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Revised: 08/19/2020] [Accepted: 09/07/2020] [Indexed: 12/27/2022] Open
Abstract
Coronavirus disease 2019 (COVID-19) poses an unprecedented challenge to world health systems, substantially increasing hospitalization and mortality rates in all affected countries. Being primarily a respiratory disease, COVID-19 is mainly associated with pneumonia or minor upper respiratory tract symptoms; however, different organs can sustain considerable (if not terminal) damage because of coronavirus. Acute kidney injury is the most common complication of COVID-19-related pneumonia, and more than 20% of patients requiring ventilatory support develop renal failure. Additionally, chronic kidney disease is a major risk factor for COVID-19 severity and mortality. All these data demonstrate the relevance of renal function assessment in patients with COVID-19 and the need of early kidney-directed diagnostic and therapeutic approaches. However, the sole assessment of renal function could be not entirely indicative of kidney tissue status. In this viewpoint, we discuss the clinical significance and potential relevance of renal functional reserve evaluation in patients with COVID-19.
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Affiliation(s)
- Vincenzo Cantaluppi
- Nephrology and Kidney Transplantation Unit, Department of Translational Medicine, University of Piemonte Orientale, "Maggiore della Carità" University Hospital, Novara, Italy
| | - Gabriele Guglielmetti
- Nephrology and Kidney Transplantation Unit, Department of Translational Medicine, University of Piemonte Orientale, "Maggiore della Carità" University Hospital, Novara, Italy
| | - Sergio Dellepiane
- Nephrology and Kidney Transplantation Unit, Department of Translational Medicine, University of Piemonte Orientale, "Maggiore della Carità" University Hospital, Novara, Italy
- Icahn School of Medicine at Mount Sinai, New York, New York
| | | | - Ravindra L Mehta
- Department of Medicine, University of California, San Diego, California
| | - Claudio Ronco
- Department of Medicine, University of Padova, Padova, Italy
- Division of Nephrology, Dialysis and Kidney Transplantation Unit, International Renal Research Institute Vicenza, "San Bortolo" Hospital, Vicenza, Italy
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Chapman CL, Johnson BD, Parker MD, Hostler D, Pryor RR, Schlader Z. Kidney physiology and pathophysiology during heat stress and the modification by exercise, dehydration, heat acclimation and aging. Temperature (Austin) 2020; 8:108-159. [PMID: 33997113 PMCID: PMC8098077 DOI: 10.1080/23328940.2020.1826841] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Revised: 09/17/2020] [Accepted: 09/17/2020] [Indexed: 02/06/2023] Open
Abstract
The kidneys' integrative responses to heat stress aid thermoregulation, cardiovascular control, and water and electrolyte regulation. Recent evidence suggests the kidneys are at increased risk of pathological events during heat stress, namely acute kidney injury (AKI), and that this risk is compounded by dehydration and exercise. This heat stress related AKI is believed to contribute to the epidemic of chronic kidney disease (CKD) occurring in occupational settings. It is estimated that AKI and CKD affect upwards of 45 million individuals in the global workforce. Water and electrolyte disturbances and AKI, both of which are representative of kidney-related pathology, are the two leading causes of hospitalizations during heat waves in older adults. Structural and physiological alterations in aging kidneys likely contribute to this increased risk. With this background, this comprehensive narrative review will provide the first aggregation of research into the integrative physiological response of the kidneys to heat stress. While the focus of this review is on the human kidneys, we will utilize both human and animal data to describe these responses to passive and exercise heat stress, and how they are altered with heat acclimation. Additionally, we will discuss recent studies that indicate an increased risk of AKI due to exercise in the heat. Lastly, we will introduce the emerging public health crisis of older adults during extreme heat events and how the aging kidneys may be more susceptible to injury during heat stress.
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Affiliation(s)
- Christopher L. Chapman
- Center for Research and Education in Special Environments, Department of Exercise and Nutrition Sciences, University at Buffalo, Buffalo, NY, USA
- Department of Human Physiology, University of Oregon, Eugene, OR, USA
| | - Blair D. Johnson
- Department of Kinesiology, School of Public Health, Indiana University, Bloomington, IN, USA
| | - Mark D. Parker
- Department of Physiology and Biophysics, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA
- Department of Ophthalmology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA
| | - David Hostler
- Center for Research and Education in Special Environments, Department of Exercise and Nutrition Sciences, University at Buffalo, Buffalo, NY, USA
| | - Riana R. Pryor
- Center for Research and Education in Special Environments, Department of Exercise and Nutrition Sciences, University at Buffalo, Buffalo, NY, USA
| | - Zachary Schlader
- Department of Kinesiology, School of Public Health, Indiana University, Bloomington, IN, USA
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Figurek A, Luyckx VA, Mueller TF. A Systematic Review of Renal Functional Reserve in Adult Living Kidney Donors. Kidney Int Rep 2020; 5:448-458. [PMID: 32274451 PMCID: PMC7136324 DOI: 10.1016/j.ekir.2019.12.021] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2019] [Revised: 12/04/2019] [Accepted: 12/31/2019] [Indexed: 01/15/2023] Open
Abstract
Introduction The kidney’s capacity to increase its glomerular filtration rate (GFR) in response to a higher functional demand is known as the renal functional reserve (RFR). Good short-term outcomes after living kidney donation have led to more acceptance of borderline donors (with hypertension, obesity, older age) due the ongoing shortage of donor organs. Given recent concerns about increased long-term risk in some donor subgroups, better donor stratification is needed. Measurement of RFR could inform assessment of donor risk. Methods A systematic literature review of studies that assessed RFR in donors pre- and/or post-donation was performed. Given study heterogeneity, descriptive analysis and narrative synthesis was conducted. Results Sixteen of 3250 identified studies published between 1956 and 2019 met inclusion criteria. Most studies were cross-sectional and conducted before (n = 8) and/or after (n = 16) kidney donation. Methods for measurement of GFR, effective renal plasma flow (ERPF) and RFR were not standardized. Changes in filtration fraction (FF) and ERPF relative to GFR observed after donation varied depending on stimulus used to induce RFR. Overall, RFR fell after donation; however, over the shorter term, RFR was largely preserved in young healthy donors. RFR was more significantly reduced in donors with hypertension, obesity, or older age. Conclusion Existing data suggest possible blunting of RFR post-donation in older, obese, and hypertensive donors, which may represent increased single-nephron GFR at baseline. The long-term implications of these changes deserve further study to determine utility in informing selection of borderline kidney donors.
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Affiliation(s)
- Andreja Figurek
- Clinic for Nephrology, University Hospital Zurich, Zurich, Switzerland.,Institute of Anatomy, University of Zurich, Zurich, Switzerland
| | - Valerie A Luyckx
- Institute of Biomedical Ethics and History of Medicine, University of Zurich, Zurich, Switzerland.,Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA.,Division of Nephrology, Kantonsspital Graubünden, Chur, Switzerland
| | - Thomas F Mueller
- Clinic for Nephrology, University Hospital Zurich, Zurich, Switzerland
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Lillås BS, Tøndel C, Gjerde A, Vikse BE. Measurement of renal functional response using iohexol clearance-a study of different outpatient procedures. Clin Kidney J 2019; 14:181-188. [PMID: 33564417 PMCID: PMC7857819 DOI: 10.1093/ckj/sfz167] [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: 06/06/2019] [Accepted: 10/21/2019] [Indexed: 11/14/2022] Open
Abstract
Background Glomerular filtration rate (GFR) increases after a heavy protein load; an increase termed renal functional response (RFR). Decreased RFR could be a marker of early kidney damage, but published methods are cumbersome in the outpatient setting. The present study investigates the use of iohexol clearance to measure RFR in outpatients using both one- and two-sample methods. Methods Fourteen healthy volunteers with a mean ± SD age of 42 ± 12 years were included (six males and eight females). GFR was measured using plasma iohexol clearance with one- and two-sample methodologies. Four measurements in each individual were performed: one baseline test and three protein loading tests containing 80 g protein (commercially available protein supplementations from Myo Nutrition and Proteinfabrikken and 350 g chicken breast). RFR was calculated as percentage increase in GFR from the baseline test. Results Mean RFR was 11.4 ± 5.4% and 12.1 ± 6.4% using one- and two-sample methods, respectively. The three different protein loads resulted in similar mean RFR but there was considerable intra-individual variability. One- and two-sample methods for measurement of RFR showed similar results with near-identical means, but there was some intra-individual variation that was similar for different protein loads. The overall 95% limit of agreement between one- and two-sample methods for calculating RFR was -8.7 to 7.3. Conclusions RFR can be investigated using plasma iohexol clearance in an outpatient setting. Protocols using commercially available protein supplementation showed a mean RFR of about 12%. One- and two-sample methods for measuring RFR yield similar results.
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Affiliation(s)
- Bjørn Steinar Lillås
- Department of Medicine, Haugesund Hospital, Haugesund, Norway.,Department of Clinical Medicine, University of Bergen, Bergen, Norway
| | - Camilla Tøndel
- Department of Clinical Medicine, University of Bergen, Bergen, Norway.,Department of Pediatrics, Haukeland University Hospital, Bergen, Norway
| | - Anna Gjerde
- Department of Medicine, Haugesund Hospital, Haugesund, Norway.,Department of Clinical Medicine, University of Bergen, Bergen, Norway
| | - Bjørn Egil Vikse
- Department of Medicine, Haugesund Hospital, Haugesund, Norway.,Department of Clinical Medicine, University of Bergen, Bergen, Norway
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Pu H, Doig GS, Heighes PT, Allingstrup MJ, Wang A, Brereton J, Pollock C, Chesher D, Bellomo R. Intravenous amino acid therapy for kidney protection in cardiac surgery patients: A pilot randomized controlled trial. J Thorac Cardiovasc Surg 2019; 157:2356-2366. [DOI: 10.1016/j.jtcvs.2018.11.097] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Revised: 11/07/2018] [Accepted: 11/08/2018] [Indexed: 01/21/2023]
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