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Tangri N, Mathur VS, Bushinsky DA, Klaerner G, Li E, Parsell D, Stasiv Y, Walker M, Wesson DE, Wheeler DC, Perkovic V, Inker LA. VALOR-CKD: A Multicenter, Randomized, Double-Blind Placebo-Controlled Trial Evaluating Veverimer in Slowing Progression of CKD in Patients with Metabolic Acidosis. J Am Soc Nephrol 2024; 35:311-320. [PMID: 38261535 PMCID: PMC10914188 DOI: 10.1681/asn.0000000000000292] [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: 09/07/2023] [Accepted: 12/03/2023] [Indexed: 01/25/2024] Open
Abstract
SIGNIFICANCE STATEMENT Metabolic acidosis is a common complication of CKD and is associated with more rapid decline of kidney function, but well-powered controlled randomized trials testing the effect of treating metabolic acidosis on slowing CKD progression have not been conducted. The VALOR-CKD study randomized 1480 individuals with CKD and metabolic acidosis, across 320 sites to placebo or veverimer (a novel hydrochloric acid binder). The findings did not demonstrate the efficacy of veverimer in slowing CKD progression, but the difference in serum bicarbonate between placebo and drug arms was only approximately 1 mEq/L. Veverimer was safe and well tolerated. BACKGROUND Metabolic acidosis is common in CKD, but whether its treatment slows CKD progression is unknown. Veverimer, a novel hydrochloric acid binder that removes acid from the gastrointestinal tract, leads to an increase in serum bicarbonate. METHODS In a phase 3, double-blind, placebo-controlled trial, patients with CKD (eGFR of 20-40 ml/min per 1.73 m 2 ) and metabolic acidosis (serum bicarbonate of 12-20 mEq/L) from 35 countries were randomized to veverimer or placebo. The primary outcome was the composite end point of CKD progression, defined as the development of ESKD (kidney transplantation or maintenance dialysis), a sustained decline in eGFR of ≥40% from baseline, or death due to kidney failure. RESULTS The mean (±SD) baseline eGFR was 29.2±6.3 ml/min per 1.73 m 2 , and serum bicarbonate was 17.5±1.4 mEq/L; this increased to 23.4±2.0 mEq/L after the active treatment run-in. After randomized withdrawal, the mean serum bicarbonate was 22.0±3.0 mEq/L and 20.9±3.3 mEq/L in the veverimer and placebo groups at month 3, and this approximately 1 mEq/L difference remained stable for the first 24 months. A primary end point event occurred in 149/741 and 148/739 patients in the veverimer and placebo groups, respectively (hazard ratio, 0.99; 95% confidence interval, 0.8 to 1.2; P = 0.90). Serious and overall adverse event incidence did not differ between the groups. CONCLUSIONS Among patients with CKD and metabolic acidosis, treatment with veverimer did not slow CKD progression. The lower than expected bicarbonate separation may have hindered the ability to test the hypothesis. CLINICAL TRIAL REGISTRY NAME AND REGISTRATION NUMBER VALOR-CKD, NCT03710291 .
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Affiliation(s)
- Navdeep Tangri
- Department of Medicine, Rady Faculty of Health Sciences, Max Rady College of Medicine, University of Manitoba, Winnipeg, Manitoba, Canada
| | | | | | | | | | | | - Yuri Stasiv
- Tricida, Inc., South San Francisco, California
| | | | - Donald E. Wesson
- Dell Medical School, The University of Texas at Austin, Austin, Texas
- Donald E. Wesson Consulting, LLC, Dallas, Texas
| | - David C. Wheeler
- Department of Renal Medicine, University College London, London, United Kingdom
| | - Vlado Perkovic
- University of New South Wales, Sydney, New South Wales, Australia
| | - Lesley A. Inker
- Division of Nephrology, Tufts Medical Center, Boston, Massachusetts
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Mannon EC, Muller PR, Sun J, Bush WB, Coleman A, Ocasio H, Polichnowski AJ, Brands MW, O'Connor PM. NaHCO3 loading causes increased arterial pressure and kidney damage in rats with chronic kidney disease. Clin Sci (Lond) 2024; 138:189-203. [PMID: 38300615 DOI: 10.1042/cs20231709] [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: 12/20/2023] [Revised: 01/26/2024] [Accepted: 02/01/2024] [Indexed: 02/02/2024]
Abstract
Sodium bicarbonate (NaHCO3) is commonly utilized as a therapeutic to treat metabolic acidosis in people with chronic kidney disease (CKD). While increased dietary sodium chloride (NaCl) is known to promote volume retention and increase blood pressure, the effects of NaHCO3 loading on blood pressure and volume retention in CKD remain unclear. In the present study, we compared the effects of NaCl and NaHCO3 loading on volume retention, blood pressure, and kidney injury in both 2/3 and 5/6 nephrectomy remnant kidney rats, a well-established rodent model of CKD. We tested the hypothesis that NaCl loading promotes greater volume retention and increases in blood pressure than equimolar NaHCO3. Blood pressure was measured 24 h daily using radio telemetry. NaCl and NaHCO3 were administered in drinking water ad libitum or infused via indwelling catheters. Rats were housed in metabolic cages to determine volume retention. Our data indicate that both NaHCO3 and NaCl promote hypertension and volume retention in remnant kidney rats, with salt-sensitivity increasing with greater renal mass reduction. Importantly, while NaHCO3 intake was less pro-hypertensive than equimolar NaCl intake, NaHCO3 was not benign. NaHCO3 loading significantly elevated blood pressure and promoted volume retention in rats with CKD when compared with control rats receiving tap water. Our findings provide important insight into the effects of sodium loading with NaHCO3 in CKD and indicate that NaHCO3 loading in patients with CKD is unlikely to be benign.
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Affiliation(s)
- Elinor C Mannon
- Department of Physiology, Medical College of Georgia at Augusta University, Augusta, Georgia, U.S.A
| | - P Robinson Muller
- Department of Physiology, Medical College of Georgia at Augusta University, Augusta, Georgia, U.S.A
| | - Jingping Sun
- Department of Physiology, Medical College of Georgia at Augusta University, Augusta, Georgia, U.S.A
| | - Weston B Bush
- Department of Physiology, Medical College of Georgia at Augusta University, Augusta, Georgia, U.S.A
| | - Alex Coleman
- Department of Physiology, Medical College of Georgia at Augusta University, Augusta, Georgia, U.S.A
| | - Hiram Ocasio
- Department of Physiology, Medical College of Georgia at Augusta University, Augusta, Georgia, U.S.A
| | - Aaron J Polichnowski
- Department of Biomedical Sciences, Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee, U.S.A
| | - Michael W Brands
- Department of Physiology, Medical College of Georgia at Augusta University, Augusta, Georgia, U.S.A
| | - Paul M O'Connor
- Department of Physiology, Medical College of Georgia at Augusta University, Augusta, Georgia, U.S.A
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Petrone BL, Aqeel A, Jiang S, Durand HK, Dallow EP, McCann JR, Dressman HK, Hu Z, Tenekjian CB, Yancy WS, Lin PH, Scialla JJ, Seed PC, Rawls JF, Armstrong SC, Stevens J, David LA. Diversity of plant DNA in stool is linked to dietary quality, age, and household income. Proc Natl Acad Sci U S A 2023; 120:e2304441120. [PMID: 37368926 PMCID: PMC10319039 DOI: 10.1073/pnas.2304441120] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Accepted: 05/10/2023] [Indexed: 06/29/2023] Open
Abstract
Eating a varied diet is a central tenet of good nutrition. Here, we develop a molecular tool to quantify human dietary plant diversity by applying DNA metabarcoding with the chloroplast trnL-P6 marker to 1,029 fecal samples from 324 participants across two interventional feeding studies and three observational cohorts. The number of plant taxa per sample (plant metabarcoding richness or pMR) correlated with recorded intakes in interventional diets and with indices calculated from a food frequency questionnaire in typical diets (ρ = 0.40 to 0.63). In adolescents unable to collect validated dietary survey data, trnL metabarcoding detected 111 plant taxa, with 86 consumed by more than one individual and four (wheat, chocolate, corn, and potato family) consumed by >70% of individuals. Adolescent pMR was associated with age and household income, replicating prior epidemiologic findings. Overall, trnL metabarcoding promises an objective and accurate measure of the number and types of plants consumed that is applicable to diverse human populations.
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Affiliation(s)
- Brianna L. Petrone
- Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, NC27710
- Medical Scientist Training Program, Duke University School of Medicine, Durham, NC27710
| | - Ammara Aqeel
- Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, NC27710
| | - Sharon Jiang
- Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, NC27710
| | - Heather K. Durand
- Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, NC27710
| | - Eric P. Dallow
- Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, NC27710
| | - Jessica R. McCann
- Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, NC27710
| | - Holly K. Dressman
- Duke Microbiome Core Facility, Center for Genomic and Computational Biology, Duke University, Durham, NC27710
| | - Zhengzheng Hu
- Duke Microbiome Core Facility, Center for Genomic and Computational Biology, Duke University, Durham, NC27710
| | | | - William S. Yancy
- Duke Lifestyle and Weight Management Center, Durham, NC27710
- Department of Medicine, Duke University School of Medicine, Durham, NC27710
| | - Pao-Hwa Lin
- Department of Medicine, Nephrology Division, Sarah W. Stedman Nutrition and Metabolism Center, Duke University Medical Center, Durham, NC27705
| | - Julia J. Scialla
- Department of Medicine, University of Virginia School of Medicine, Charlottesville, VA22903
- Department of Public Health Sciences, University of Virginia School of Medicine, Charlottesville, VA22903
| | - Patrick C. Seed
- Division of Pediatric Infectious Diseases, Ann & Robert H. Lurie Children’s Hospital of Chicago, Chicago, IL60611
| | - John F. Rawls
- Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, NC27710
- Duke Microbiome Center, Duke University School of Medicine, Durham, NC27710
| | - Sarah C. Armstrong
- Department of Pediatrics, Duke University School of Medicine, Durham, NC27710
| | - June Stevens
- Department of Nutrition, University of North Carolina at Chapel Hill, Chapel Hill, NC27599
| | - Lawrence A. David
- Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, NC27710
- Duke Microbiome Center, Duke University School of Medicine, Durham, NC27710
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Koh ES. Hidden Acid Retention with Normal Serum Bicarbonate Level in Chronic Kidney Disease. Electrolyte Blood Press 2023; 21:34-43. [PMID: 37434806 PMCID: PMC10329907 DOI: 10.5049/ebp.2023.21.1.34] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Revised: 04/06/2023] [Accepted: 04/16/2023] [Indexed: 07/13/2023] Open
Abstract
Management of metabolic acidosis is crucial for preserving bone, muscle, and renal health, as evidenced by the results of several interventional studies conducted on patients with chronic kidney disease (CKD). Considering the continuity of CKD progression over time, it is reasonable to deduce that a subclinical form of metabolic acidosis may exist prior to the manifestation of overt metabolic acidosis. Covert H+ retention with normal serum bicarbonate level in patients with CKD may result in maladaptive responses that contribute to kidney function deterioration, even in the early stages of the disease. The loss of adaptive compensatory mechanisms of urinary acid excretion may be a key factor in this process. Early modulation of these responses could be an important therapeutic strategy in preventing CKD progression. However, to date, the optimal approach for alkali therapy in subclinical metabolic acidosis in CKD remains uncertain. There is a lack of established guidelines on when to initiate alkali therapy, potential side effects of alkali agents, and the optimal blood bicarbonate levels based on evidence-based practices. Therefore, further research is necessary to address these concerns and establish more robust guidelines for the use of alkali therapy in patients with CKD. Herein, we provide an overview of recent developments on this subject and examine the potential therapeutic approaches that interventional treatments may present for patients with hidden H+ retention, exhibiting normal serum bicarbonate levels - commonly described as subclinical or eubicarbonatemic metabolic acidosis in patients with CKD.
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Affiliation(s)
- Eun Sil Koh
- Division of Nephrology, Department of Internal Medicine, Yeouido St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
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5
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Zhang J, Wang X, Ma Z, Dang Y, Yang Y, Cao S, Ouyang C, Shi X, Pan J, Hu X. Associations of urinary and blood cadmium concentrations with all-cause mortality in US adults with chronic kidney disease: a prospective cohort study. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:61659-61671. [PMID: 36933131 DOI: 10.1007/s11356-023-26451-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Accepted: 03/10/2023] [Indexed: 05/10/2023]
Abstract
Epidemiological evidence for the relationship between cadmium exposure and mortality in specific chronic kidney disease (CKD) populations remains scarce. We aimed to explore the relationships between cadmium concentrations in urine and blood and all-cause mortality among CKD patients in the USA. This cohort study was composed of 1825 CKD participants from the National Health and Nutrition Examination Survey (NHANES) (1999-2014) who were followed up to December 31, 2015. All-cause mortality was ascertained by matching the National Death Index (NDI) records. We estimated hazard ratios (HRs) and 95% confidence intervals (CIs) for all-cause mortality in relation to urinary and blood cadmium concentrations by Cox regression models. During an average follow-up period of 82 months, 576 CKD participants died. Compared with the lowest quartiles, HRs (95% CIs) for all-cause mortality associated with the fourth weighted quartiles of urinary and blood cadmium concentrations were 1.75 (1.28 to 2.39) and 1.59 (1.17 to 2.15), respectively. Furthermore, the HRs (95% CIs) for all-cause mortality per ln-transformed IQR increment in cadmium concentrations in urine (1.15 μg/g UCr) and blood (0.95 μg/L) were 1.40 (1.21 to 1.63) and 1.22 (1.07 to 1.40), respectively. Linear concentration-response relationships between urinary and blood cadmium concentrations and all-cause mortality were also found. Our findings suggested that increased cadmium concentrations in both urine and blood significantly contributed to enhanced mortality risk in CKD patients, thus highlighting that efforts to reduce cadmium exposure may reduce mortality risk in high-risk populations with CKD.
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Affiliation(s)
- Jia Zhang
- Institute of Epidemiology and Health Statistics, School of Public Health, Lanzhou University, No.199, Donggang West Road, Chengguan District, Lanzhou, 730000, Gansu Province, China
| | - Xiao Wang
- Institute of Epidemiology and Health Statistics, School of Public Health, Lanzhou University, No.199, Donggang West Road, Chengguan District, Lanzhou, 730000, Gansu Province, China
| | - Zhibin Ma
- Institute of Epidemiology and Health Statistics, School of Public Health, Lanzhou University, No.199, Donggang West Road, Chengguan District, Lanzhou, 730000, Gansu Province, China
| | - Ying Dang
- Institute of Epidemiology and Health Statistics, School of Public Health, Lanzhou University, No.199, Donggang West Road, Chengguan District, Lanzhou, 730000, Gansu Province, China
| | - Yaya Yang
- Institute of Epidemiology and Health Statistics, School of Public Health, Lanzhou University, No.199, Donggang West Road, Chengguan District, Lanzhou, 730000, Gansu Province, China
| | - Shuting Cao
- Institute of Epidemiology and Health Statistics, School of Public Health, Lanzhou University, No.199, Donggang West Road, Chengguan District, Lanzhou, 730000, Gansu Province, China
| | - Changping Ouyang
- Institute of Epidemiology and Health Statistics, School of Public Health, Lanzhou University, No.199, Donggang West Road, Chengguan District, Lanzhou, 730000, Gansu Province, China
| | - Xiaoru Shi
- Institute of Epidemiology and Health Statistics, School of Public Health, Lanzhou University, No.199, Donggang West Road, Chengguan District, Lanzhou, 730000, Gansu Province, China
| | - Jinhua Pan
- Institute of Epidemiology and Health Statistics, School of Public Health, Lanzhou University, No.199, Donggang West Road, Chengguan District, Lanzhou, 730000, Gansu Province, China
| | - Xiaobin Hu
- Institute of Epidemiology and Health Statistics, School of Public Health, Lanzhou University, No.199, Donggang West Road, Chengguan District, Lanzhou, 730000, Gansu Province, China.
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Rehman MZ, Melamed M, Harris A, Shankar M, Rosa RM, Batlle D. Urinary Ammonium in Clinical Medicine: Direct Measurement and the Urine Anion Gap as a Surrogate Marker During Metabolic Acidosis. ADVANCES IN KIDNEY DISEASE AND HEALTH 2023; 30:197-206. [PMID: 36868734 DOI: 10.1053/j.akdh.2022.12.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Accepted: 12/15/2022] [Indexed: 03/05/2023]
Abstract
Ammonium is the most important component of urinary acid excretion, normally accounting for about two-third of net acid excretion. In this article, we discuss urine ammonium not only in the evaluation of metabolic acidosis but also in other clinical conditions such as chronic kidney disease. Different methods to measure urine NH4+ that have been employed over the years are discussed. The enzymatic method used by clinical laboratories in the United States to measure plasma ammonia via the glutamate dehydrogenase can be used for urine ammonium. The urine anion gap calculation can be used as a rough marker of urine ammonium in the initial bedside evaluation of metabolic acidosis such as in distal renal tubular acidosis. Urine ammonium measurements, however, should be made more available in clinical medicine for a precise evaluation of this important component of urinary acid excretion.
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Affiliation(s)
- Mohammed Z Rehman
- Division of Nephrology and Hypertension, Northwestern University Feinberg School of Medicine, Chicago, IL
| | - Michal Melamed
- Department of Medicine (Nephrology), Albert Einstein College of Medicine/Montefiore Medical Center, Bronx, NY
| | - Autumn Harris
- Department of Small Animal Clinical Sciences College of Veterinary Medicine, Gainesville, FL
| | - Mythri Shankar
- Department of Nephrology, Institute of Nephro-urology, Bengaluru, India
| | - Robert M Rosa
- Division of Nephrology and Hypertension, Northwestern University Feinberg School of Medicine, Chicago, IL
| | - Daniel Batlle
- Division of Nephrology and Hypertension, Northwestern University Feinberg School of Medicine, Chicago, IL.
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Uribarri J, Goldfarb DS, Raphael KL, Rein JL, Asplin JR. Beyond the Urine Anion Gap: In Support of the Direct Measurement of Urinary Ammonium. Am J Kidney Dis 2022; 80:667-676. [PMID: 35810828 DOI: 10.1053/j.ajkd.2022.05.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Accepted: 05/10/2022] [Indexed: 02/02/2023]
Abstract
Ammonium is a major urinary buffer that is necessary for the normal excretion of the daily acid load. Its urinary rate of excretion (UNH4) may be increased several fold in the presence of extrarenal metabolic acidosis. Therefore, measurement of UNH4 can provide important clues about causes of metabolic acidosis. Because UNH4 is not commonly measured in clinical laboratories, the urinary anion gap (UAG) was proposed as its surrogate about 4 decades ago, and it is still frequently used for that purpose. Several published studies strongly suggest that UAG is not a good index of UNH4 and support the concept that direct measurement of UNH4 is an important parameter to define in clinical nephrology. Low UNH4 levels have recently been found to be associated with a higher risk of metabolic acidosis, loss of kidney function, and death in persons with chronic kidney disease, while surrogates like the UAG do not recapitulate this risk. In order to advance the field it is necessary for the medical community to become more familiar with UNH4 levels in a variety of clinical settings. Herein, we review the literature, searching for available data on UNH4 under normal and various pathological conditions, in an attempt to establish reference values to interpret UNH4 results if and when UNH4 measurements become available as a routine clinical test. In addition, we present original data in 2 large populations that provide further evidence that the UAG is not a good predictor of UNH4. Measurement of urine NH4 holds promise to aid clinicians in the care of patients, and we encourage further research to determine its best diagnostic usage.
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Affiliation(s)
- Jaime Uribarri
- Renal Division, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York.
| | | | - Kalani L Raphael
- Oregon Health & Science University and VA Portland Health Care System, Portland, Oregon
| | - Joshua L Rein
- Renal Division, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
| | - John R Asplin
- Litholink Corporation, Laboratory Corporation of America Holdings, Chicago, Illinois
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Ravikumar NPG, Pao AC, Raphael KL. Acid-Mediated Kidney Injury Across the Spectrum of Metabolic Acidosis. Adv Chronic Kidney Dis 2022; 29:406-415. [PMID: 36175078 DOI: 10.1053/j.ackd.2022.04.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 04/15/2022] [Accepted: 04/25/2022] [Indexed: 01/25/2023]
Abstract
Metabolic acidosis affects about 15% of patients with chronic kidney disease. As kidney function declines, the kidneys progressively fail to eliminate acid, primarily reflected by a decrease in ammonium and titratable acid excretion. Several studies have shown that the net acid load remains unchanged in patients with reduced kidney function; the ensuing acid accumulation can precede overt metabolic acidosis, and thus, indicators of urinary acid or potential base excretion, such as ammonium and citrate, may serve as early signals of impending metabolic acidosis. Acid retention, with or without overt metabolic acidosis, initiates compensatory responses that can promote tubulointerstitial fibrosis via intrarenal complement activation and upregulation of endothelin-1, angiotensin II, and aldosterone pathways. The net effect is a cycle between acid accumulation and kidney injury. Results from small- to medium-sized interventional trials suggest that interrupting this cycle through base administration can prevent further kidney injury. While these findings inform current clinical practice guidelines, large-scale clinical trials are still necessary to prove that base therapy can limit chronic kidney disease progression or associated adverse events.
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Affiliation(s)
- Naveen P G Ravikumar
- Division of Nephrology & Hypertension, Department of Medicine, Oregon Health & Science University, Portland, OR; Veterans Affairs Portland Health Care System, Portland, OR
| | - Alan C Pao
- Division of Nephrology, Department of Medicine, Stanford University School of Medicine, Stanford, CA; Veterans Affairs Palo Alto Health Care System, Palo Alto, CA
| | - Kalani L Raphael
- Division of Nephrology & Hypertension, Department of Medicine, Oregon Health & Science University, Portland, OR; Veterans Affairs Portland Health Care System, Portland, OR.
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Nagami GT, Kraut JA. Regulation of Acid-Base Balance in Patients With Chronic Kidney Disease. Adv Chronic Kidney Dis 2022; 29:337-342. [PMID: 36175071 DOI: 10.1053/j.ackd.2022.05.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Revised: 05/16/2022] [Accepted: 05/31/2022] [Indexed: 01/25/2023]
Abstract
Normallly the kidneys handle the daily acid load arising from net endogenous acid production from the metabolism of ingested animal protein (acid) and vegetables (base). With chronic kidney disease, reduced acid excretion by the kidneys is primarily due to reduced ammonium excretion such that when acid excertion falls below acid porduction, acid accumulation occurs. With even mild reductions in glomerular filtration rate (60 to 90 ml/min), net acid excretion may fall below net acid production resulting in acid retention which may be initially sequestered in interstitial compartments in the kidneys, bones, and muscles resulting in no fall in measured systemic bicarbonate levels (eubicarbonatemic metabolic acidosis). With greater reductions in kidney function, the greater quantities of acid retained spillover systemically resulting in low pH (overt metabolic acidosis). The evaluation of acid-base balance in patients with CKD is complicated by the heterogeneity of clinical acid-base disorders and by the eubicarbonatemic nature of the early phase of acid retention. If supported by more extensive studies, blood gas analyses to confirm the acid-base disorder and newer ways for assessing the presence of acidosis such as urinary citrate measurements may become routine tools to evaluate and treat acid-base disorders in individuals with CKD.
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Affiliation(s)
- Glenn T Nagami
- Division of Nephrology, Department of Medicine, VA Greater Los Angeles Healthcare System, Los Angeles, CA; David Geffen School of Medicine, UCLA, Los Angeles, CA.
| | - Jeffrey A Kraut
- Division of Nephrology, VHAGLA Healthcare System, Los Angeles, CA; UCLA Membrane Biology Laboratory, David Geffen UCLA School of Medicine, Los Angeles, CA
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Lunyera J, Diamantidis CJ, Bosworth HB, Patel UD, Bain J, Muehlbauer MJ, Ilkayeva O, Nguyen M, Sharma B, Ma JZ, Shah SH, Scialla JJ. Urine tricarboxylic acid cycle signatures of early-stage diabetic kidney disease. Metabolomics 2021; 18:5. [PMID: 34928443 DOI: 10.1007/s11306-021-01858-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Accepted: 11/28/2021] [Indexed: 10/19/2022]
Abstract
INTRODUCTION Urine tricarboxylic acid (TCA) cycle organic anions (OAs) are elevated in diabetes and may be biomarkers for diabetic kidney disease (DKD) progression. OBJECTIVES We assessed associations of 10 urine TCA cycle OAs with estimated glomerular filtration rate (eGFR) and eGFR slope. METHODS This study is ancillary to the Simultaneous Risk Factor Control Using Telehealth to SlOw Progression of Diabetic Kidney Disease (STOP-DKD) Trial-a randomized trial of pharmacist-led medication and behavior management in 281 patients with early to moderate DKD at Duke from 2014 to 2015. We used linear mixed models to assess associations of urine TCA cycle OAs with outcomes and modelled TCA cycle OAs as: (1) the average of z-scores for each OA; and (2) principal component (PC) scores derived by principal component analysis (PCA). Untargeted urine metabolomics were added for additional discovery. RESULTS Among 132 participants with 24 h urine samples (50% men; 58% Black; mean age 64 years [SD 9]; mean eGFR 74 ml/min/1.73m2 [SD 21] and median urine albumin-to-creatinine [UACR] 20 mg/g [IQR 8-95]), PCA identified 3 OA metabolite PCs. Malate, fumarate, pyruvate, α-ketoglutarate, lactate, succinate and citrate/isocitrate loaded positively on PC1; methylsuccinate, ethylmalonate and succinate loaded positively on PC2; and methylmalonate, ethylmalonate and citrate/isocitrate loaded negatively on PC3. Over a median follow-up of 1.8 years (IQR, 1.2 to 2.2), higher average OA z-score was strongly associated with higher eGFR after covariate adjustment (p = 0.01), but not with eGFR slope (p = 0.9). Higher PC3, but not other PCs, was associated with lower eGFR (p < 0.001). Conditional random forests and smooth clipped absolute deviation models confirmed methylmalonate, citrate/isocitrate, and ethylmalonate, and added lactate as top ranked metabolites in models of baseline eGFR (R-squared 0.32 and 0.33, respectively). Untargeted urine metabolites confirmed association of urine TCA cycle OAs with kidney function. CONCLUSION Thus, lower urine TCA cycle OAs, most notably lower methylmalonate, ethylmalonate and citrate/isocitrate, are potential indicators of kidney impairment in early stage DKD.
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Affiliation(s)
- Joseph Lunyera
- Department of Medicine, Duke University School of Medicine, Durham, NC, USA
| | - Clarissa J Diamantidis
- Department of Medicine, Duke University School of Medicine, Durham, NC, USA
- Department of Population Health Sciences, Duke University School of Medicine, Durham, NC, USA
| | - Hayden B Bosworth
- Department of Medicine, Duke University School of Medicine, Durham, NC, USA
- Department of Population Health Sciences, Duke University School of Medicine, Durham, NC, USA
- Center of Innovation to Accelerate Discovery and Practice Transformation (ADAPT), Durham Veterans Affairs Medical Center, Durham, NC, USA
| | - Uptal D Patel
- Department of Medicine, Duke University School of Medicine, Durham, NC, USA
- AstraZeneca, Gaithersburg, MD, USA
| | - James Bain
- Department of Medicine, Duke University School of Medicine, Durham, NC, USA
- Duke Molecular Physiology Institute, Duke University School of Medicine, Durham, NC, USA
| | - Michael J Muehlbauer
- Duke Molecular Physiology Institute, Duke University School of Medicine, Durham, NC, USA
| | - Olga Ilkayeva
- Department of Medicine, Duke University School of Medicine, Durham, NC, USA
- Duke Molecular Physiology Institute, Duke University School of Medicine, Durham, NC, USA
| | - Maggie Nguyen
- Duke Molecular Physiology Institute, Duke University School of Medicine, Durham, NC, USA
| | - Binu Sharma
- Department of Medicine, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Jennie Z Ma
- Department of Public Health Sciences, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Svati H Shah
- Department of Medicine, Duke University School of Medicine, Durham, NC, USA
- Duke Molecular Physiology Institute, Duke University School of Medicine, Durham, NC, USA
- Duke Clinical Research Institute, Duke University School of Medicine, Durham, NC, USA
| | - Julia J Scialla
- Department of Medicine, University of Virginia School of Medicine, Charlottesville, VA, USA.
- Department of Public Health Sciences, University of Virginia School of Medicine, Charlottesville, VA, USA.
- Division of Nephrology, School of Medicine, University of Virginia, Box 800133, Charlottesville, VA, 22908, USA.
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Cai XY, Zhang NH, Cheng YC, Ge SW, Xu G. Sugar-sweetened beverage consumption and mortality of chronic kidney disease: results from the US National Health and Nutrition Examination Survey, 1999–2014. Clin Kidney J 2021; 15:718-726. [PMID: 35371462 PMCID: PMC8967538 DOI: 10.1093/ckj/sfab227] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Indexed: 11/25/2022] Open
Abstract
Background The relationship between intake of sugar-sweetened beverages (SSBs) and the risk of death in patients with chronic kidney disease (CKD) is unclear. We evaluated the association between SSB intake and subsequent overall mortality in CKD patients. Methods We included data from 3996 CKD patients who participated in the 1999–2014 National Health and Nutrition Examination Survey (NHANES). SSB intake was assessed by a 24-h dietary recall, grouped as none, >0 to <1 serving/day, 1 to <2 servings/day and ≥2 servings/day. After adjusting for demographic variables, lifestyle, diet and comorbidities, Cox proportional risk regressions were applied to analyze the associations between the daily intake of SSBs as well as added sugar from beverages and all-cause mortality. Results In the whole research population, the median age at baseline was 67 years, 22% were Black and 54% were female. A total of 42% had stage 3 CKD. During an average follow-up period of 8.3 years, a sum of 1137 (28%) deaths from all causes was recorded. The confounder-adjusted risk of mortality was associated with an increase of 1 serving/day of SSBs, with all-cause mortality of 1.18 [95% confidence interval (95% CI)1.08–1.28], and intakes of increased 20-g added sugar/1000 kcal of total energy per day were associated with all-cause mortality of 1.14 (1.05–1.24). Equivalently substituting 1 serving/day of SSBs with unsweetened coffee [HR (95% CI) 0.82 (0.74–0.91)], unsweetened tea [HR (95% CI) 0.86 (0.76–0.98)], plain water [HR (95% CI) 0.79 (0.71–0.88)], or non- or low-fat milk [HR (95% CI) 0.75 (0.60–0.93)] were related to a 14–25% reduced risk of all-cause mortality. Conclusion Findings suggest that in the CKD population, increased SSB intake was associated with a higher risk of mortality and indicated a stratified association with dose. Plain water and unsweetened coffee/tea might be possible alternatives for SSBs to avert untimely deaths.
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Affiliation(s)
- Xiao-Yu Cai
- Division of Internal Medicine, Department of Nephrology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Nan-Hui Zhang
- Department of Nephrology, Xiangyang No.1 People's Hospital, Hubei University of Medicine, Xiangyang, Hubei Province, China
| | - Yi-Chun Cheng
- Division of Internal Medicine, Department of Nephrology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Shu-Wang Ge
- Division of Internal Medicine, Department of Nephrology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Gang Xu
- Division of Internal Medicine, Department of Nephrology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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12
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Urine and Plasma Metabolome of Healthy Adults Consuming the DASH (Dietary Approaches to Stop Hypertension) Diet: A Randomized Pilot Feeding Study. Nutrients 2021; 13:nu13061768. [PMID: 34067295 PMCID: PMC8224662 DOI: 10.3390/nu13061768] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Revised: 05/10/2021] [Accepted: 05/20/2021] [Indexed: 12/17/2022] Open
Abstract
We aimed to identify plasma and urine metabolites altered by the Dietary Approaches to Stop Hypertension (DASH) diet in a post-hoc analysis of a pilot feeding trial. Twenty adult participants with un-medicated hypertension consumed a Control diet for one week followed by 2 weeks of random assignment to either Control or DASH diet. Non-missing fasting plasma (n = 56) and 24-h urine (n = 40) were used to profile metabolites using untargeted gas chromatography/mass spectrometry. Linear models were used to compare metabolite levels between the groups. In urine, 19 identifiable untargeted metabolites differed between groups at p < 0.05. These included a variety of phenolic acids and their microbial metabolites that were higher during the DASH diet, with many at false discovery rate (FDR) adjusted p < 0.2. In plasma, eight identifiable untargeted metabolites were different at p < 0.05, but only gamma-tocopherol was significantly lower on DASH at FDR adjusted p < 0.2. The results provide insights into the mechanisms of benefit of the DASH diet.
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