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Jensen MS, de Araujo IBBA, Mutsaers HAM, Nørregaard R. Transcutaneous measurement of renal function in two rodent models of obstructive nephropathy. BMC Res Notes 2023; 16:119. [PMID: 37365638 DOI: 10.1186/s13104-023-06387-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Accepted: 06/13/2023] [Indexed: 06/28/2023] Open
Abstract
OBJECTIVE Glomerular filtration rate (GFR) is a key indicator of renal function. In both clinical practice and pre-clinical research, serum levels of endogenous filtration markers, such as creatinine, are often used to estimate GFR. However, these markers often do not reflect minor changes in renal function. In this study, we therefore set out to evaluate the applicability of transcutaneous GFR (tGFR) measurements to monitor the changes in renal function, as compared to plasma creatinine (pCreatinine), in two models of obstructive nephropathy, namely unilateral ureteral obstruction (UUO) or bilateral ureteral obstruction followed by release (BUO-R) in male Wistar rats. RESULTS UUO animals showed a significant reduction in tGFR compared to baseline; whereas pCreatinine levels were not significantly changed. In BUO animals, tGFR drops 24 h post BUO and remains lower upon release of the obstruction until day 11. Concomitantly, pCreatinine levels were also increased 24 h after obstruction and 24 h post release, however after 4 days, pCreatinine returned to baseline levels. In conclusion, this study revealed that the tGFR method is superior at detecting minor changes in renal function as compared to pCreatinine measurements.
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Affiliation(s)
- Michael Schou Jensen
- Department of Clinical Medicine, Aarhus University, Palle Juul-Jensens Boulevard 11, Aarhus N, DK-8200, Denmark
| | | | - Henricus A M Mutsaers
- Department of Clinical Medicine, Aarhus University, Palle Juul-Jensens Boulevard 11, Aarhus N, DK-8200, Denmark
| | - Rikke Nørregaard
- Department of Clinical Medicine, Aarhus University, Palle Juul-Jensens Boulevard 11, Aarhus N, DK-8200, Denmark.
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2
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Winchester LJ, Hooper AL, Kerch CJ. Ease of restroom access influences fluid consumption habits and health in classroom teachers. INTERNATIONAL JOURNAL OF OCCUPATIONAL SAFETY AND ERGONOMICS 2023; 29:386-391. [PMID: 35296215 DOI: 10.1080/10803548.2022.2053346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Objectives. There are rising concerns about the health of classroom teachers in the USA, including stress, hypertension and frequent urinary tract infections. Teacher working conditions are likely a contributor to their health concerns. Many teachers report that they cannot easily take a restroom break at work, and therefore they consume minimal water or other fluids. This study investigated the relationship between restroom access and fluid consumption and the prevalence of renal and cardiovascular health complications in classroom teachers. Methods. The responses of 844 teachers (92% women, 8% men; 65.1% between age 26 and 45 years) to an online survey about restroom accessibility, fluid consumption and health were analyzed using descriptive statistics, χ2 analyses and logistic regression. Results. Fifty-nine percent of teachers could not easily take a restroom break, and 54.7% consumed fewer than 2 cups of water per workday. Furthermore, 44.8% reported being pre-hypertensive and 4.9% reported being hypertensive. Teachers with insufficient restroom access were significantly more likely to report frequent urinary tract infections. Conclusions. This study demonstrates a relationship between restroom access, fluid consumption and renal/cardiovascular health in classroom teachers. Future research should directly investigate how teacher work environment impacts renal and cardiovascular health.
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Mohammedin AS, AlSaid AH, Almalki AM, Alsaiari AR, Alghamdi FN, Jalalah AA, Alghamdi AF, Jatoi NA. Assessment of Hydration Status and Blood Pressure in a Tertiary Care Hospital at Al-Khobar. Cureus 2022; 14:e27706. [PMID: 36081979 PMCID: PMC9441182 DOI: 10.7759/cureus.27706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/05/2022] [Indexed: 11/05/2022] Open
Abstract
Background High blood pressure is a major cardiovascular risk factor. It is a leading cause of increasing morbidity and mortality worldwide. One-third of the adult population worldwide suffers from hypertension. Salt intake, obesity, decreased physical activity, and smoking are well known to increase blood pressure. Fluid retention is the main contributing factor to primary hypertension and adversely affects the cardiovascular system. The emerging evidence suggests a relationship between blood pressure and hydration status. Our study aims to assess the correlation between hydration status and blood pressure. We aim to assess the hydration status in subjects with normal and high blood pressure and to investigate the association of hydration status with hemodynamic measurement. Methodology This cross-sectional and observational study included adult (>18 years) male and female subjects who agreed to participate. In total, 235 subjects were recruited by convenience sampling from (1) patients and caregivers attending geriatric and internal medicine clinics, and (2) visitors coming to King Fahad University Hospital at Al-Khobar. There were five patients on oral diuretics who were excluded from the study. Data were collected from September 2021 to March 2022. Hydration status was measured by a bioelectrical impedance analyzer (Bioscan 920, Maltron International Ltd. Rayleigh, UK). Hemodynamic measurements included heart rate per minute, systolic blood pressure, diastolic blood pressure, pulse pressure (the difference between systolic and diastolic blood pressure), and mean arterial pressure calculated as blood diastolic pressure plus one-third of pulse pressure. Statistical analyses were performed using SPSS statistics for windows, version 28.0 (IBM Corp., Armonk, NY, USA). Descriptive data were reported using means with standard deviations for numerical data and relative frequencies (percentage) for categorical data. P-values of less than 0.05 were considered statistically significant. Comparison between groups was done using a one-way analysis of variance test. Results Extracellular water percentage was higher in hypertensive (45.0 ± 2) than prehypertensive (43.5 ± 3) or normotensive (43.0 ± 2) (p = 0.001) subjects. In contrast, intracellular water percentage and total body water percentage were significantly negatively related to hypertension status. Conclusions Our results have shown a strong association between hypertension status and hydration parameters. In our study, hypertensive subjects tended to have lower total body water percentage and intracellular water percentage (bioimpedance value) than normotensive subjects. This might promote more research regarding the relationship between hypohydration and cardiovascular disease pathophysiology. This outcome should raise awareness about proper hydration as hypohydration can be a causative factor for hypertension.
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4
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Use of Levetiracetam in Epileptic Dogs with Chronic Kidney Disease: A Retrospective Study. Vet Sci 2021; 8:vetsci8110263. [PMID: 34822636 PMCID: PMC8617888 DOI: 10.3390/vetsci8110263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 11/01/2021] [Accepted: 11/02/2021] [Indexed: 11/30/2022] Open
Abstract
In human medicine, doses of levetiracetam (LEV) are individualized for patients with epilepsy, depending on the status of the patient’s renal function. However, there are not reports on the individualized dosing of LEV for small animals. The aim of this study is to investigate whether a dose adjustment of LEV is needed in dogs with chronic kidney disease (CKD). Patient databases were searched, and 37 dogs with seizures or epilepsy were retrospectively included in this study. Based on pre-existing CKD, patients were divided into a CKD group (n = 20) and a non-CKD group (n = 17). We collected kidney panels before and after LEV treatment. Side-effects were monitored for 1 month after the start of LEV administration. In the CKD group, more dogs developed adverse effects (85%) than in the non-CKD group (52.94%). After LEV administration, an increase in blood urea nitrogen and/or serum creatinine was more often reported in the CKD group than it was in the non-CKD group. Our data indicate that in dogs with seizures or epilepsy with pre-existing CKD, an LEV dose-adjustment is needed. During LEV treatment, CKD patients should be monitored for side-effects and may require laboratory evaluation of renal function.
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Langdale CL, Degoski D, Milliken PH, Grill WM. Voiding behavior in awake unrestrained untethered spontaneously hypertensive and Wistar control rats. Am J Physiol Renal Physiol 2021; 321:F195-F206. [PMID: 34151591 DOI: 10.1152/ajprenal.00564.2020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The spontaneously hypertensive rat (SHR), a genetic model of high blood pressure, has also been studied as a potential model of overactive bladder. In vivo studies have confirmed the presence of surrogate markers of overactive bladder, including detrusor overactivity, increased urinary frequency, decreased bladder capacity and voided volume (VV), and afferent hypersensitivity to bladder irritation. However, these observations were during awake cystometry using implanted bladder catheters tethered to an infusion pump and artificially filled. We conducted experiments in awake unrestrained untethered age-matched female SHRs and Wistar rats to quantify naïve consumption and voiding behavior and the effect of capsaicin desensitization on consumption and voiding behavior. Food and water consumption, body weight, voiding frequency, and VV were recorded. Rats were placed in metabolism cages for 24 h, up to twice a week, from 17 to 37 wk of age. Compared with Wistar rats, SHRs exhibited decrease in VV and did not exhibit diurnal variation in VV between light and dark periods, suggesting that SHRs may have bladder hypersensitivity. Furthermore, SHRs may also have smaller bladder capacities, as they consumed less water, voided less volume (regardless of light cycle), and had equal urinary frequencies compared with age-matched Wistar rats. We detected no change in SHR voiding behavior following capsaicin desensitization, which was in contrast to a prior awake in vivo cystometry study describing increased VV and micturition interval in SHRs and suggests that C-fiber activity may not contribute to bladder hypersensitivity in SHRs.NEW & NOTEWORTHY We characterized the long-term (20 wk) voiding, defecation, and consumption behavior of age-matched spontaneously hypertensive and Wistar rats without the influence of anesthesia or catheters. Spontaneously hypertensive rats exhibited bladder hypersensitiviy that persisted for the 20-wk duration and was unaffected by capsacin desensitization.
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Affiliation(s)
| | - Danielle Degoski
- Department of Biomedical Engineering, Duke University, Durham, North Carolina
| | | | - Warren M Grill
- Department of Biomedical Engineering, Duke University, Durham, North Carolina.,Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina.,Department of Neurobiology, Duke University, Durham, North Carolina.,Department of Neurosurgery, Duke University, Durham, North Carolina
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6
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Houser MC, Mac V, Smith DJ, Chicas RC, Xiuhtecutli N, Flocks JD, Elon L, Tansey MG, Sands JM, McCauley L, Hertzberg VS. Inflammation-Related Factors Identified as Biomarkers of Dehydration and Subsequent Acute Kidney Injury in Agricultural Workers. Biol Res Nurs 2021; 23:676-688. [PMID: 34018403 DOI: 10.1177/10998004211016070] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Globally, there is increasing recognition that agricultural workers are at risk for chronic kidney disease of unknown etiology (CKDu). Recurrent heat exposure, physical exertion, dehydration, muscle damage, and inflammation are hypothesized to contribute to the development of CKDu, but the relative importance of these processes and the interactions among them remain unclear. Moreover, there is a need to identify biomarkers that could distinguish individuals who are at greatest risk for kidney damage to target preventative interventions for CKDu. In this study, we evaluated dehydration and markers of inflammation, muscle damage, and renal function in agricultural workers at a non-workday baseline assessment. Urine specific gravity and kidney function were measured before and after work shifts on three subsequent days, and heat index, core body temperature, and heart rate were monitored during the work shifts. A combination of direct comparisons and machine learning algorithms revealed that reduced levels of uromodulin and sodium in urine and increased levels of interleukin-6 and C-reactive protein in serum were indicative of dehydration at baseline, and that dehydration, high body mass index, reduced urine uromodulin, and increased serum interleukin-6, C-reactive protein, and lipopolysaccharide-binding protein at baseline were predictive of acute kidney injury on subsequent workdays. Our findings suggest a method for identifying agricultural workers at greatest risk for kidney injury and reveal potential mechanisms responsible for this process, including pathways overlapping in dehydration and kidney injury. These results will guide future studies confirming these mechanisms and introducing interventions to protect kidney health in this vulnerable population.
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Affiliation(s)
- Madelyn C Houser
- Nell Hodgson Woodruff School of Nursing, Emory University, Atlanta, GA, USA
| | - Valerie Mac
- Nell Hodgson Woodruff School of Nursing, Emory University, Atlanta, GA, USA
| | - Daniel J Smith
- Nell Hodgson Woodruff School of Nursing, Emory University, Atlanta, GA, USA
| | - Roxana C Chicas
- Renal Division, Department of Medicine, Emory University, Atlanta, GA, USA
| | - Nezahualcoyotl Xiuhtecutli
- Farmworker Association of Florida, Apopka, FL, USA.,Department of Anthropology, Tulane University, New Orleans, LA, USA
| | - Joan D Flocks
- Social Policy Division, Center for Governmental Responsibility, Levin College of Law, University of Florida, Gainesville, FL, USA
| | - Lisa Elon
- Department of Biostatistics and Bioinformatics, Emory University, Atlanta, GA, USA
| | | | - Jeff M Sands
- Renal Division, Department of Medicine, Emory University, Atlanta, GA, USA
| | - Linda McCauley
- Nell Hodgson Woodruff School of Nursing, Emory University, Atlanta, GA, USA
| | - Vicki S Hertzberg
- Nell Hodgson Woodruff School of Nursing, Emory University, Atlanta, GA, USA
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7
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Mathiesen SM, Fuglsang KA, Ranzato G, Scheike T, Jeppesen PB. Renal function in patients with intestinal failure receiving home parenteral support. JPEN J Parenter Enteral Nutr 2021; 46:310-318. [PMID: 33914343 DOI: 10.1002/jpen.2131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND Progressive renal impairment, given by an annual decline in estimated glomerular filtration rate (eGFR), has been described in patients with intestinal failure (IF) receiving home parenteral support (HPS). The objective of this study was to examine changes in eGFR over 5 years following initiation of HPS treatment and to identify potential risk factors for loss of renal function. METHOD This retrospective database study investigates eGFR changes in nonmalignant IF patients discharged with HPS from Rigshospitalet, Copenhagen, in an 8-year period. RESULTS One year after HPS initiation, mean eGFR decreased by 15.3 ml/min/1.73 m2 . Paired t-test showed a decline of 15.0 ml/min/1.73 m2 (95% CI, -18.3 to -11.6; P < .0001). Over the following years, eGFR continued to decrease but at insignificant lower rates. Decreased eGFR was associated with increasing age, female sex, increasing body weight, diabetes at HPS initiation, and a high requirement of HPS volume. CONCLUSION In nonmalignant IF patients, the decrease of eGFR was mainly seen during the first year of HPS. This may be due to a higher risk of dehydration and possibly secondary hyperaldosteronism leading to renal damage following the onset of IF. However, the decrease in eGFR may also represent a higher production of creatinine due to a beneficial increase of muscle mass in the initial recovery phase. In general, once the patients were stabilized, the eGFR decline followed a physiological course resembling the background population. Patients with diabetes or high HPS volume needs seem to be more vulnerable and may require special attention.
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Affiliation(s)
| | | | - Giovanna Ranzato
- Department of Biostatistics, University of Copenhagen, Copenhagen, Denmark
| | - Thomas Scheike
- Department of Biostatistics, University of Copenhagen, Copenhagen, Denmark
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8
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Ali MA, Abu Damir H, Ali OM, Amir N, Tariq S, Greenwood MP, Lin P, Gillard B, Murphy D, Adem A. The effect of long-term dehydration and subsequent rehydration on markers of inflammation, oxidative stress and apoptosis in the camel kidney. BMC Vet Res 2020; 16:458. [PMID: 33228660 PMCID: PMC7686779 DOI: 10.1186/s12917-020-02628-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Accepted: 10/19/2020] [Indexed: 12/24/2022] Open
Abstract
Background Dehydration has deleterious effects in many species, but camels tolerate long periods of water deprivation without serious health compromise. The kidney plays crucial role in water conservation, however, some reports point to elevated kidney function tests in dehydrated camels. In this work, we investigated the effects of dehydration and rehydration on kidney cortex and medulla with respect to pro-inflammatory markers, oxidative stress and apoptosis along with corresponding gene expression. Results The cytokines IL-1β and IL-18 levels were significantly elevated in the kidney cortex of dehydrated camel, possibly expressed by tubular epithelium, podocytes and/or mesangial cells. Elevation of IL-18 persisted after rehydration. Dehydration induced oxidative stress in kidney cortex evident by significant increases in MDA and GSH, but significant decreases in SOD and CAT. In the medulla, CAT decreased significantly, but MDA, GSH and SOD levels were not affected. Rehydration abolished the oxidative stress. In parallel with the increased levels of MDA, we observed increased levels of PTGS1 mRNA, in MDA synthesis pathway. GCLC mRNA expression level, involved in GSH synthesis, was upregulated in kidney cortex by rehydration. However, both SOD1 and SOD3 mRNA levels dropped, in parallel with SOD activity, in the cortex by dehydration. There were significant increases in caspases 3 and 9, p53 and PARP1, indicating apoptosis was triggered by intrinsic pathway. Expression of BCL2l1 mRNA levels, encoding for BCL-xL, was down regulated by dehydration in cortex. CASP3 expression level increased significantly in medulla by dehydration and continued after rehydration whereas TP53 expression increased in cortex by rehydration. Changes in caspase 8 and TNF-α were negligible to instigate extrinsic apoptotic trail. Generally, apoptotic markers were extremely variable after rehydration indicating that animals did not fully recover within three days. Conclusions Dehydration causes oxidative stress in kidney cortex and apoptosis in cortex and medulla. Kidney cortex and medulla were not homogeneous in all parameters investigated indicating different response to dehydration/rehydration. Some changes in tested parameters directly correlate with alteration in steady-state mRNA levels.
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Affiliation(s)
- Mahmoud A Ali
- Department of Pharmacology, CollegeofMedicine&HealthSciences, United Arab Emirates University, Al- Ain, United Arab Emirates
| | - Hassan Abu Damir
- Department of Pharmacology, CollegeofMedicine&HealthSciences, United Arab Emirates University, Al- Ain, United Arab Emirates
| | - Osman M Ali
- College of Medicine and Public Health, Flinders University, Adelaide, Australia
| | - Naheed Amir
- Department of Pharmacology, CollegeofMedicine&HealthSciences, United Arab Emirates University, Al- Ain, United Arab Emirates
| | - Saeed Tariq
- Department of Anatomy, CollegeofMedicine&HealthSciences, Emirates University, Al-Ain, United Arab Emirates
| | - Michael P Greenwood
- Molecular Neuroendocrinology Research Group, Bristol Medical School, Translational Health Sciences, University of Bristol, Dorothy Hodgkin Building, Bristol, BS13NY, UK
| | - Panjiao Lin
- Molecular Neuroendocrinology Research Group, Bristol Medical School, Translational Health Sciences, University of Bristol, Dorothy Hodgkin Building, Bristol, BS13NY, UK
| | - Benjamin Gillard
- Molecular Neuroendocrinology Research Group, Bristol Medical School, Translational Health Sciences, University of Bristol, Dorothy Hodgkin Building, Bristol, BS13NY, UK
| | - David Murphy
- Molecular Neuroendocrinology Research Group, Bristol Medical School, Translational Health Sciences, University of Bristol, Dorothy Hodgkin Building, Bristol, BS13NY, UK.
| | - Abdu Adem
- Department of Pharmacology, CollegeofMedicine&HealthSciences, United Arab Emirates University, Al- Ain, United Arab Emirates. .,Department of Pharmacology, College of Medicine and Health Sciences, Khalifa University, P.O.Box 127788, Abu Dhabi, UAE.
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Bethancourt HJ, Swanson ZS, Nzunza R, Huanca T, Conde E, Kenney WL, Young SL, Ndiema E, Braun D, Pontzer H, Rosinger AY. Hydration in relation to water insecurity, heat index, and lactation status in two small-scale populations in hot-humid and hot-arid environments. Am J Hum Biol 2020; 33:e23447. [PMID: 32583580 DOI: 10.1002/ajhb.23447] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Revised: 05/06/2020] [Accepted: 05/11/2020] [Indexed: 12/21/2022] Open
Abstract
OBJECTIVES This study compared the prevalence of concentrated urine (urine specific gravity ≥1.021), an indicator of hypohydration, across Tsimane' hunter-forager-horticulturalists living in hot-humid lowland Bolivia and Daasanach agropastoralists living in hot-arid Northern Kenya. It tested the hypotheses that household water and food insecurity would be associated with higher odds of hypohydration. METHODS This study collected spot urine samples and corresponding weather data along with data on household water and food insecurity, demographics, and health characteristics among 266 Tsimane' households (N = 224 men, 235 women, 219 children) and 136 Daasanach households (N = 107 men, 120 women, 102 children). RESULTS The prevalence of hypohydration among Tsimane' men (50.0%) and women (54.0%) was substantially higher (P < .001) than for Daasanach men (15.9%) and women (17.5%); the prevalence of hypohydration among Tsimane' (37.0%) and Daasanach (31.4%) children was not significantly different (P = .33). Multiple logistic regression models suggested positive but not statistically significant trends between household water insecurity and odds of hypohydration within populations, yet some significant joint effects of water and food insecurity were observed. Heat index (2°C) was associated with a 23% (95% confidence interval [CI]: 1.09-1.40, P = .001), 34% (95% CI: 1.18-1.53, P < .0005), and 23% (95% CI: 1.04-1.44, P = .01) higher odds of hypohydration among Tsimane' men, women, and children, respectively, and a 48% (95% CI: 1.02-2.15, P = .04) increase in the odds among Daasanach women. Lactation status was also associated with hypohydration among Tsimane' women (odds ratio = 3.35, 95% CI: 1.62-6.95, P = .001). CONCLUSION These results suggest that heat stress and reproductive status may have a greater impact on hydration status than water insecurity across diverse ecological contexts.
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Affiliation(s)
- Hilary J Bethancourt
- Department of Biobehavioral Health, The Pennsylvania State University, University Park, Pennsylvania, USA
| | - Zane S Swanson
- Department of Evolutionary Anthropology, Duke University, Durham, North Carolina, USA
| | | | - Tomas Huanca
- Centro Boliviano de Investigacion y Desarrollo Socio Integral (CBIDSI), San Borja, Bolivia
| | - Esther Conde
- Centro Boliviano de Investigacion y Desarrollo Socio Integral (CBIDSI), San Borja, Bolivia
| | - W Larry Kenney
- Department of Kinesiology, The Pennsylvania State University, University Park, Pennsylvania, USA
| | - Sera L Young
- Department of Anthropology, Northwestern University, Evanston, Illinois, USA
| | - Emmanuel Ndiema
- Department of Earth Sciences, National Museums of Kenya, Nairobi, Kenya
| | - David Braun
- Department of Anthropology, Center for the Advanced Study of Human Paleobiology, The George Washington University, Washington, District of Columbia, USA.,Department of Human Evolution, Max Planck Institute of Evolutionary Anthropology, Leipzig, Germany
| | - Herman Pontzer
- Department of Evolutionary Anthropology, Duke University, Durham, North Carolina, USA.,Global Health Institute, Duke University, Durham, North Carolina, USA
| | - Asher Y Rosinger
- Department of Biobehavioral Health, The Pennsylvania State University, University Park, Pennsylvania, USA.,Department of Anthropology, The Pennsylvania State University, Pennsylvania, USA
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10
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Meal Frequency and Skipping Breakfast Are Associated with Chronic Kidney Disease. Nutrients 2020; 12:nu12020331. [PMID: 32012653 PMCID: PMC7071178 DOI: 10.3390/nu12020331] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2020] [Revised: 01/24/2020] [Accepted: 01/25/2020] [Indexed: 12/17/2022] Open
Abstract
Chronic underhydration and malnutrition can be associated with irreversible renal damage. This study investigated the association of meal frequency and breakfast skipping with chronic kidney disease (CKD) in South Korea. Participants (4370 participants from the Korean National Health and Nutrition Examination Survey VI 2013-2014) were divided into two groups based on meal frequency: ≥ 15 or < 15 meals/week. They were further divided into four groups based on the frequency of breakfast, lunch, and dinner consumed in the previous year. The data were analyzed with complex samples logistic regression. We found that 9.6% of the participants (n = 412) had CKD, which was associated with gender, body mass index, serum fasting glucose, daily calorie intake, hypertension, diabetes, and cerebrovascular accident. Participants consuming <15 meals/week had a higher risk of CKD than those who consumed ≥15 meals/week (adjusted odds ratio [OR] 1.531, 95% confidence interval [CI] 1.209-1.938). Participants who rarely had breakfast showed a higher risk of CKD than those who had breakfast 5-7 times/week (adjusted OR 1.572, 95% CI 1.108-2.231). Our findings suggest that <15 meals/week or skipping breakfast is associated with a higher risk of CKD in the general South Korean population, especially for men or persons aged 42-64 years.
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Lee CJ, Gardiner BS, Evans RG, Smith DW. Analysis of the critical determinants of renal medullary oxygenation. Am J Physiol Renal Physiol 2019; 317:F1483-F1502. [DOI: 10.1152/ajprenal.00315.2019] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
We have previously developed a three-dimensional computational model of oxygen transport in the renal medulla. In the present study, we used this model to quantify the sensitivity of renal medullary oxygenation to four of its major known determinants: medullary blood flow (MBF), medullary oxygen consumption rate (V̇o2,M), hemoglobin (Hb) concentration in the blood, and renal perfusion pressure. We also examined medullary oxygenation under special conditions of hydropenia, extracellular fluid volume expansion by infusion of isotonic saline, and hemodilution during cardiopulmonary bypass. Under baseline (normal) conditions, the average medullary tissue Po2 predicted for the whole renal medulla was ~30 mmHg. The periphery of the interbundle region in the outer medulla was identified as the most hypoxic region in the renal medulla, which demonstrates that the model prediction is qualitatively accurate. Medullary oxygenation was most sensitive to changes in renal perfusion pressure followed by Hb, MBF, and V̇o2,M, in that order. The medullary oxygenation also became sensitized by prohypoxic changes in other parameters, leading to a greater fall in medullary tissue Po2 when multiple parameters changed simultaneously. Hydropenia did not induce a significant change in medullary oxygenation compared with the baseline state, while volume expansion resulted in a large increase in inner medulla tissue Po2 (by ~15 mmHg). Under conditions of cardiopulmonary bypass, the renal medulla became severely hypoxic, due to hemodilution, with one-third of the outer stripe of outer medulla tissue having a Po2 of <5 mmHg.
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Affiliation(s)
- Chang-Joon Lee
- College of Science, Health, Engineering and Education, Murdoch University, Perth, Western Australia, Australia
- Faculty of Engineering and Mathematical Sciences, The University of Western Australia, Perth, Western Australia, Australia
| | - Bruce S. Gardiner
- College of Science, Health, Engineering and Education, Murdoch University, Perth, Western Australia, Australia
- Faculty of Engineering and Mathematical Sciences, The University of Western Australia, Perth, Western Australia, Australia
| | - Roger G. Evans
- Cardiovascular Disease Program, Biomedicine Discovery Institute and Department of Physiology, Monash University, Melbourne, Victoria, Australia
| | - David W. Smith
- Faculty of Engineering and Mathematical Sciences, The University of Western Australia, Perth, Western Australia, Australia
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12
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Kanbay M, Yilmaz S, Dincer N, Ortiz A, Sag AA, Covic A, Sánchez-Lozada LG, Lanaspa MA, Cherney DZI, Johnson RJ, Afsar B. Antidiuretic Hormone and Serum Osmolarity Physiology and Related Outcomes: What Is Old, What Is New, and What Is Unknown? J Clin Endocrinol Metab 2019; 104:5406-5420. [PMID: 31365096 DOI: 10.1210/jc.2019-01049] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Accepted: 07/25/2019] [Indexed: 12/16/2022]
Abstract
CONTEXT Although the physiology of sodium, water, and arginine vasopressin (AVP), also known as antidiuretic hormone, has long been known, accumulating data suggest that this system operates as a more complex network than previously thought. EVIDENCE ACQUISITION English-language basic science and clinical studies of AVP and osmolarity on the development of kidney and cardiovascular disease and overall outcomes. EVIDENCE SYNTHESIS Apart from osmoreceptors and hypovolemia, AVP secretion is modified by novel factors such as tongue acid-sensing taste receptor cells and brain median preoptic nucleus neurons. Moreover, pharyngeal, esophageal, and/or gastric sensors and gut microbiota modulate AVP secretion. Evidence is accumulating that increased osmolarity, AVP, copeptin, and dehydration are all associated with worse outcomes in chronic disease states such as chronic kidney disease (CKD), diabetes, and heart failure. On the basis of these pathophysiological relationships, an AVP receptor 2 blocker is now licensed for CKD related to polycystic kidney disease. CONCLUSION From a therapeutic perspective, fluid intake may be associated with increased AVP secretion if it is driven by loss of urine concentration capacity or with suppressed AVP if it is driven by voluntary fluid intake. In the current review, we summarize the literature on the relationship between elevated osmolarity, AVP, copeptin, and dehydration with renal and cardiovascular outcomes and underlying classical and novel pathophysiologic pathways. We also review recent unexpected and contrasting findings regarding AVP physiology in an attempt to explain and understand some of these relationships.
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Affiliation(s)
- Mehmet Kanbay
- Division of Nephrology, Department of Medicine, Koc University School of Medicine, Istanbul, Turkey
| | - Sezen Yilmaz
- Department of Medicine, Koc University School of Medicine, Istanbul, Turkey
| | - Neris Dincer
- Department of Medicine, Koc University School of Medicine, Istanbul, Turkey
| | - Alberto Ortiz
- Dialysis Unit, School of Medicine, IIS-Fundacion Jimenez Diaz, Universidad Autónoma de Madrid, Madrid, Spain
| | - Alan A Sag
- Division of Vascular and Interventional Radiology, Department of Radiology, Duke University Medical Center, Durham, North Carolina
| | - Adrian Covic
- Nephrology Department, Dialysis and Renal Transplant Center, "Dr. C. I. Parhon" University Hospital, "Grigore T. Popa" University of Medicine and Pharmacy, Iasi, Romania
| | - Laura G Sánchez-Lozada
- Laboratory of Renal Physiopathology, Department of Nephrology, INC Ignacio Chávez, Mexico City, Mexico
| | - Miguel A Lanaspa
- Division of Renal Diseases and Hypertension, School of Medicine, University of Colorado Denver, Aurora, Colorado
| | - David Z I Cherney
- Department of Medicine, Division of Nephrology, Toronto General Hospital, University of Toronto, Toronto, Ontario, Canada
| | - Richard J Johnson
- Division of Renal Diseases and Hypertension, School of Medicine, University of Colorado Denver, Aurora, Colorado
| | - Baris Afsar
- Division of Nephrology, Department of Medicine, Suleyman Demirel University School of Medicine, Isparta, Turkey
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Daily JW, Zhang T, Wu X, Park S. Chronic water insufficiency induced kidney damage and energy dysregulation despite reduced food intake, which improved gut microbiota in female rats. J Physiol Sci 2019; 69:599-612. [PMID: 30953307 PMCID: PMC10717426 DOI: 10.1007/s12576-019-00668-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2018] [Accepted: 02/17/2019] [Indexed: 01/03/2023]
Abstract
Water intake is recommended for weight loss, but the relationship between water intake and energy metabolism is not clear. We hypothesized that long-term water insufficiency would influence energy, glucose, and lipid metabolism while modulating gut microbiota. Female rats were provided with high-fat diets with different amounts of water and food intake for 6 weeks as follows: water provided for 1 h per day with food ad libitum (WRFA), water supply ad libitum plus pair feeding of with water restricted rats(WAFR), water restriction with ad libitum food for 3 weeks and water and food intake ad libitum for 3 weeks (WR-WA) and ad libitum supply of water and food (WAFA). Water intake in WRFA was about one-third of WAFR and WAFA, whereas food intake was lowered by 30% in WRFA and WAFR than WAFA. Body fat decreased in WRFA and WAFR, but WAFR decreased fat mass more than WRFA. Energy expenditure was lower in WRFA than WAFA and carbohydrate utilization was much higher in WRFA than the other groups. The peak serum glucose concentrations were lower in WAFA than the other groups and WRFA lowered serum insulin levels more than WAFA during OGTT. WRFA shrank the glomerulus with increased apoptotic cells and damaged renal tubules compared to the WAFA and WAFR. WR-WA also exhibited greater glomerular shrinkage and apoptosis that WAFA, but not as much WRFA, indicating that the kidneys were healing after water restriction damage. WRFA exacerbated dyslipidemia compared to the WAFA and WAFR groups. The gut microbiome was similarly modulated in WRFA and WAFR, compared to WAFA, but it was mainly affected by food intake, not water restriction in the host. WRFA and WAFR increased Bacteroidetes and decreased Firmicutes compared WAFA. In conclusion, chronic insufficient water intake induced renal damage, decreased energy expenditure, and exacerbated dyslipidemia in rats with reduced food intake. However, the reduction of food intake improved gut microbiome regardless of insufficient water intake and only minor effects on the microbiome were observed due to water restriction.
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Affiliation(s)
| | - Ting Zhang
- Department of Food and Nutrition, Obesity/Diabetes Center, Hoseo University, 165 Sechul-Ri, BaeBang-Yup, Asan-Si, ChungNam-Do, Asan, 336-795, South Korea
| | - Xuangao Wu
- Department of Food and Nutrition, Obesity/Diabetes Center, Hoseo University, 165 Sechul-Ri, BaeBang-Yup, Asan-Si, ChungNam-Do, Asan, 336-795, South Korea
| | - Sunmin Park
- Department of Food and Nutrition, Obesity/Diabetes Center, Hoseo University, 165 Sechul-Ri, BaeBang-Yup, Asan-Si, ChungNam-Do, Asan, 336-795, South Korea.
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14
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García-Trabanino R, Cerdas M, Madero M, Jakobsson K, Barnoya J, Crowe J, Jarquín E, Guzmán-Quilo C, Correa-Rotter R. Nefropatía mesoamericana: revisión breve basada en el segundo taller del Consorcio para el estudio de la Epidemia de Nefropatía en Centroamérica y México (CENCAM). NEFROLOGÍA LATINOAMERICANA 2017. [DOI: 10.1016/j.nefrol.2016.11.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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15
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NOMURA S, MONOBE M, EMA K, MAEDA-YAMAMOTO M, NESUMI A. Comparison of the Effects of Three Tea Cultivars ( Camellia sinensis L.) on Nitric Oxide Production and Aortic Soluble Guanylate Cyclase Expression in High-Salt Diet-Fed Spontaneously Hypertensive Rats. J Nutr Sci Vitaminol (Tokyo) 2017; 63:306-314. [DOI: 10.3177/jnsv.63.306] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Sachiko NOMURA
- Tea Research Division, Institute of Fruit Tree and Tea Science, National Agriculture and Food Research Organization (NARO)
| | - Manami MONOBE
- Tea Research Division, Institute of Fruit Tree and Tea Science, National Agriculture and Food Research Organization (NARO)
| | - Kaori EMA
- Tea Research Division, Institute of Fruit Tree and Tea Science, National Agriculture and Food Research Organization (NARO)
| | | | - Atsushi NESUMI
- Tea Research Division, Institute of Fruit Tree and Tea Science, National Agriculture and Food Research Organization (NARO)
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