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Dodd SAS, Adolphe J, Dewey C, Khosa D, Abood SK, Verbrugghe A. Efficacy of vitamin D 2 in maintaining serum total vitamin D concentrations and bone mineralisation in adult dogs fed a plant-based (vegan) diet in a 3-month randomised trial. Br J Nutr 2024; 131:391-405. [PMID: 37671585 PMCID: PMC10784131 DOI: 10.1017/s0007114523001952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 08/14/2023] [Accepted: 08/23/2023] [Indexed: 09/07/2023]
Abstract
Dogs are considered omnivores based on their evolution consuming diets including animal tissue. Few feeding trials evaluating the nutritional suitability of exclusively plant-based (vegan) diets in dogs have been published, and the efficacy of vitamin D2 in maintaining canine serum vitamin D levels has not been clearly determined. A blinded dietary trial included sixty-one healthy desexed adult dogs: thirty-one fed an experimental extruded vegan diet (PLANT) and thirty fed a commercial extruded meat-based diet (MEAT) for 3 months. Dogs were screened via veterinary examination and routine laboratory analyses prior to enrolment, at baseline and exit timepoints. Body composition was measured by dual-energy X-ray absorptiometry and blood was collected for vitamin D profiling. All dogs maintained health parameters, body weight and composition throughout the study. Dogs maintained on PLANT demonstrated a significant reduction in platelet count, creatinine, blood urea nitrogen and cholesterol, though values remained within normal reference ranges. Dogs fed PLANT also demonstrated a shift from vitamin D3 to vitamin D2 metabolites, though total vitamin D analogue levels were unchanged, with the exception of 24,25-dihydroxyvitamin D. Bone mineral content and density did not differ from baseline values. Health status was maintained in dogs fed PLANT and vitamin D2 appeared efficacious in maintaining serum total vitamin D concentrations and bone mineralisation. Findings support the hypothesis that PLANT was comparable to MEAT for maintenance of healthy adult dogs for at least 3 months and identified areas where further research is warranted to elucidate the potential risks and benefits of plant-based (vegan) diets.
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Affiliation(s)
- Sarah A. S. Dodd
- Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Canada
- Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, N1G 2W1, Canada
| | - Jennifer Adolphe
- Department of Veterinary Biomedical Sciences, University of Saskatchewan, Saskatoon, Canada
| | - Cate Dewey
- Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Canada
| | - Deep Khosa
- Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Canada
| | - Sarah K. Abood
- Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Canada
| | - Adronie Verbrugghe
- Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, N1G 2W1, Canada
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2
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Hasan M, Reyer H, Oster M, Trakooljul N, Ponsuksilli S, Magowan E, Fischer DC, Wimmers K. Exposure to artificial ultraviolet-B light mediates alterations on the hepatic transcriptome and vitamin D metabolism in pigs. J Steroid Biochem Mol Biol 2024; 236:106428. [PMID: 37984748 DOI: 10.1016/j.jsbmb.2023.106428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 10/28/2023] [Accepted: 11/17/2023] [Indexed: 11/22/2023]
Abstract
In the currently prevailing pig husbandry systems, the vitamin D status is almost exclusively dependent on dietary supply. Additional endogenous vitamin D production after exposure to ultraviolet-B (UVB) light might allow the animals to utilize minerals in a more efficient manner, as well as enable the production of functional vitamin D-enriched meat for human consumption. In this study, growing pigs (n = 16) were subjected to a control group or to a daily narrowband UVB exposure of 1 standard erythema dose (SED) for a period of 9 weeks until slaughter at a body weight of 105 kg. Transcriptomic profiling of liver with emphasis on the associated effects on vitamin D metabolism due to UVB exposure were evaluated via RNA sequencing. Serum was analyzed for vitamin D status and health parameters such as minerals and biochemical markers. The serum concentration of calcidiol, but not calcitriol, was significantly elevated in response to UVB exposure after 17 days on trial. No effects of UVB exposure were observed on growth performance and blood test results. At slaughter, the RNA sequencing analyses following daily UVB exposure revealed 703 differentially expressed genes (DEGs) in liver tissue (adjusted p-value < 0.01). Results showed that molecular pathways for vitamin D synthesis (CYP2R1) rather than cholesterol synthesis (DHCR7) were preferentially initiated in liver. Gene enrichment (p < 0.05) was observed for reduced cholesterol/steroid biosynthesis, SNARE interactions in vesicular transport, and CDC42 signaling. Taken together, dietary vitamin D supply can be complemented via endogenous production after UVB exposure in pig husbandry, which could be considered in the development of functional foods.
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Affiliation(s)
- Maruf Hasan
- Research Institute for Farm Animal Biology (FBN), Dummerstorf, Germany
| | - Henry Reyer
- Research Institute for Farm Animal Biology (FBN), Dummerstorf, Germany
| | - Michael Oster
- Research Institute for Farm Animal Biology (FBN), Dummerstorf, Germany
| | - Nares Trakooljul
- Research Institute for Farm Animal Biology (FBN), Dummerstorf, Germany
| | | | - Elizabeth Magowan
- Agri-Food and Biosciences Institute, Large Park, Hillsborough, Co Down, BT26 6DR, United Kingdom
| | - Dagmar-Christiane Fischer
- Department of Pediatrics, Rostock University Medical Center, Ernst-Heydemann-Str. 8, 18057 Rostock, Germany
| | - Klaus Wimmers
- Research Institute for Farm Animal Biology (FBN), Dummerstorf, Germany; Faculty of Agricultural and Environmental Sciences, University Rostock, Rostock, Germany.
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3
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Laursen SH, Boel L, Brandi L, Christensen JH, Vestergaard P, Hejlesen OK. Evaluation of a phosphate kinetics model in hemodialysis therapy-Assessment of the temporal robustness of model predictions. Physiol Rep 2023; 11:e15899. [PMID: 38129113 PMCID: PMC10737683 DOI: 10.14814/phy2.15899] [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: 04/21/2023] [Revised: 12/04/2023] [Accepted: 12/04/2023] [Indexed: 12/23/2023] Open
Abstract
In-depth understanding of intra- and postdialytic phosphate kinetics is important to adjust treatment regimens in hemodialysis. We aimed to modify and validate a three-compartment phosphate kinetic model to individual patient data and assess the temporal robustness. Intradialytic phosphate samples were collected from the plasma and dialysate of 12 patients during two treatments (HD1 and HD2). 2-h postdialytic plasma samples were collected in four of the patients. First, the model was fitted to HD1 samples from each patient to estimate the mass transfer coefficients. Second, the best fitted model in each patient case was validated on HD2 samples. The best model fits were determined from the coefficient of determination (R2 ) values. When fitted to intradialytic samples only, the median (interquartile range) R2 values were 0.985 (0.959-0.997) and 0.992 (0.984-0.994) for HD1 and HD2, respectively. When fitted to both intra- and postdialytic samples, the results were 0.882 (0.838-0.929) and 0.963 (0.951-0.976) for HD1 and HD2, respectively. Eight patients demonstrated a higher R2 value for HD2 than for HD1. The model seems promising to predict individual plasma phosphate in hemodialysis patients. The results also show good temporal robustness of the model. Further modifications and validation on a larger sample are needed.
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Affiliation(s)
- Sisse H. Laursen
- The Danish Diabetes AcademyOdense University HospitalOdenseDenmark
- Department of Health Science and TechnologyAalborg UniversityAalborgDenmark
- Department of NursingUniversity College of Northern DenmarkAalborgDenmark
- Steno Diabetes Center North JutlandAalborg University HospitalAalborgDenmark
- Clinical Nursing Research UnitAalborg University HospitalAalborgDenmark
| | - Lise Boel
- Department of Clinical MedicineAalborg UniversityAalborgDenmark
| | - Lisbet Brandi
- Department of Cardiology, Nephrology, and Endocrinology, Nordsjællands HospitalHillerødDenmark
| | | | - Peter Vestergaard
- Steno Diabetes Center North JutlandAalborg University HospitalAalborgDenmark
- Department of Clinical MedicineAalborg UniversityAalborgDenmark
- Department of EndocrinologyAalborg University HospitalAalborgDenmark
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Harahap IA, Kuligowski M, Schmidt M, Kołodziejski PA, Suliburska J. Effects of isoflavone and probiotic intake on calcium transport and bone metabolism biomarkers in female rats. Food Sci Nutr 2023; 11:6324-6335. [PMID: 37823105 PMCID: PMC10563734 DOI: 10.1002/fsn3.3571] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 06/15/2023] [Accepted: 07/09/2023] [Indexed: 10/13/2023] Open
Abstract
Calcium is essential for maintaining bone health as it contributes to bone formation, remodeling, strength, and density. This study investigated the effect of isoflavones and probiotics on calcium transporters' gene expression, serum calcium levels, and bone metabolism biomarkers in healthy female rats. Forty-eight female Wistar rats were classified into six groups. Bone metabolism biomarkers (pyridinoline, deoxypyridinoline, parathyroid hormone, and osteocalcin) and serum calcium levels were measured by enzyme-linked immunosorbent assay (ELISA) and atomic absorption spectroscopy (AAS), respectively. Gene expression of calcium transporters (Trpv5 and Trpv6) was evaluated in duodenum and jejunum tissue samples using quantitative polymerase chain reaction (qPCR). Trpv5 and Trpv6, epithelial calcium channels, play a crucial role in calcium transport and homeostasis in the body. The study consisted of a1-week adaptation period for the rats to adjust to the controlled conditions, followed by an 8-week intervention phase. The daidzein and genistein group showed a significant increase in the gene expression of the Trpv6 transporter in the duodenum and a marked decrease in serum pyridinoline levels compared to the control group. The tempeh and soybean groups showed a significant decrease in the gene expression of the Trpv5 calcium transporter in the jejunum. However, no significant influence of the Lactobacillus acidophilus diet on calcium transport and bone metabolism biomarkers was observed in the L. acidophilus group. The correlation analysis showed a significant positive relationship between serum calcium, bone metabolism biomarkers, and calcium transporters. In conclusion, our study demonstrates that the daidzein and genistein diet improves calcium transport in the duodenum and reduces pyridinoline serum concentrations, while tempeh and soybean diets reduce calcium transport in the jejunum. However, the combination of daidzein, genistein, and L. acidophilus did not demonstrate a synergistic effect on calcium transport and bone metabolism, suggesting that further investigations are needed to elucidate their potential interactions.
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Affiliation(s)
- Iskandar Azmy Harahap
- Department of Human Nutrition and Dietetics, Faculty of Food Science and NutritionPoznan University of Life SciencesPoznanPoland
| | - Maciej Kuligowski
- Department of Food Technology of Plant Origin, Faculty of Food Science and NutritionPoznan University of Life SciencesPoznanPoland
| | - Marcin Schmidt
- Department of Biotechnology and Food Microbiology, Faculty of Food Science and NutritionPoznan University of Life SciencesPoznanPoland
| | - Paweł A. Kołodziejski
- Department of Animal Physiology, Biochemistry and Biostructure, Faculty of Veterinary Medicine and Animal SciencePoznań University of Life SciencesPoznanPoland
| | - Joanna Suliburska
- Department of Human Nutrition and Dietetics, Faculty of Food Science and NutritionPoznan University of Life SciencesPoznanPoland
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Kim YC, Ki SW, Kim H, Kang S, Kim H, Go GW. Recent Advances in Nutraceuticals for the Treatment of Sarcopenic Obesity. Nutrients 2023; 15:3854. [PMID: 37686886 PMCID: PMC10490319 DOI: 10.3390/nu15173854] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Revised: 08/26/2023] [Accepted: 09/01/2023] [Indexed: 09/10/2023] Open
Abstract
Sarcopenic obesity, low muscle mass, and high body fat are growing health concerns in the aging population. This review highlights the need for standardized criteria and explores nutraceuticals as potential therapeutic agents. Sarcopenic obesity is associated with insulin resistance, inflammation, hormonal changes, and reduced physical activity. These factors lead to impaired muscle activity, intramuscular fat accumulation, and reduced protein synthesis, resulting in muscle catabolism and increased fat mass. Myostatin and irisin are myokines that regulate muscle synthesis and energy expenditure, respectively. Nutritional supplementation with vitamin D and calcium is recommended for increasing muscle mass and reducing body fat content. Testosterone therapy decreases fat mass and improves muscle strength. Vitamin K, specifically menaquinone-4 (MK-4), improves mitochondrial function and reduces muscle damage. Irisin is a hormone secreted during exercise that enhances oxidative metabolism, prevents insulin resistance and obesity, and improves bone quality. Low-glycemic-index diets and green cardamom are potential methods for managing sarcopenic obesity. In conclusion, along with exercise and dietary support, nutraceuticals, such as vitamin D, calcium, vitamin K, and natural agonists of irisin or testosterone, can serve as promising future therapeutic alternatives.
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Affiliation(s)
| | | | | | | | | | - Gwang-woong Go
- Department of Food and Nutrition, Hanyang University, Seoul 04763, Republic of Korea; (Y.-C.K.); (S.-W.K.); (H.K.); (S.K.); (H.K.)
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24,25-Dihydroxy Vitamin D and Vitamin D Metabolite Ratio as Biomarkers of Vitamin D in Chronic Kidney Disease. Nutrients 2023; 15:nu15030578. [PMID: 36771287 PMCID: PMC9920774 DOI: 10.3390/nu15030578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 01/16/2023] [Accepted: 01/19/2023] [Indexed: 01/24/2023] Open
Abstract
The appropriate management of vitamin D deficiency and hyperparathyroidism is essential to prevent metabolic bone disorder (MBD) and cardiovascular diseases in chronic kidney disease (CKD). Recently, the 24,25-dihydroxyvitamin D [24,25(OH)2D] and vitamin D metabolite ratio (VMR), i.e., the ratio of 24,25(OH)2D to 25-hydroxyvitamin D [25(OH)D], have emerged as biomarkers of vitamin D level. We analyzed the usefulness of vitamin D biomarkers for the evaluation of MBD in patients with CKD. We analyzed blood and urine samples from 208 outpatients with CKD stage G2-G5. 25(OH)D showed a poor correlation with the estimated glomerular filtration rate (eGFR). Conversely, the 24,25(OH)2D level and VMR were significantly correlated with eGFR and the intact parathyroid hormone level. In conclusion, 24,25(OH)2D and VMR have the potential to be vitamin D biomarkers for the detection of MBD in CKD patients.
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Kinshella MLW, Omar S, Scherbinsky K, Vidler M, Magee LA, von Dadelszen P, Moore SE, Elango R. Maternal nutritional risk factors for pre-eclampsia incidence: findings from a narrative scoping review. Reprod Health 2022; 19:188. [PMID: 36064716 PMCID: PMC9442926 DOI: 10.1186/s12978-022-01485-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Accepted: 07/21/2022] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND Pre-eclampsia is a leading cause of maternal mortality and morbidity that involves pregnancy-related stressors on the maternal cardiovascular and metabolic systems. As nutrition is important to support optimal development of the placenta and for the developing fetus, maternal diets may play a role in preventing pre-eclampsia. The purpose of this scoping review is to map the maternal nutritional deficiencies and imbalances associated with pre-eclampsia incidence and discuss evidence consistency and linkages with current understandings of the etiology of pre-eclampsia. METHODS A narrative scoping review was conducted to provide a descriptive account of available research, summarize research findings and identify gaps in the evidence base. Relevant observational studies and reviews of observational studies were identified in an iterative two-stage process first involving electronic database searches then more sensitive searches as familiarity with the literature increased. Results were considered in terms of their consistency of evidence, effect sizes and biological plausibility. RESULTS The review found evidence for associations between nutritional inadequacies and a greater risk of pre-eclampsia. These associations were most likely mediated through oxidative stress, inflammation, maternal endothelial dysfunction and blood pressure in the pathophysiology of pre-eclampsia. Maternal nutritional risk factors for pre-eclampsia incidence with the strongest consistency, effect and biological plausibility include vitamin C and its potential relationship with iron status, vitamin D (both on its own and combined with calcium and magnesium), and healthy dietary patterns featuring high consumption of fruits, vegetables, whole grains, fish, seafood and monounsaturated vegetable oils. Foods high in added sugar, such as sugary drinks, were associated with increased risk of pre-eclampsia incidence. CONCLUSION A growing body of literature highlights the involvement of maternal dietary factors in the development of pre-eclampsia. Our review findings support the need for further investigation into potential interactions between dietary factors and consideration of nutritional homeostasis and healthy dietary patterns. Further research is recommended to explore gestational age, potential non-linear relationships, dietary diversity and social, cultural contexts of food and meals.
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Affiliation(s)
- Mai-Lei Woo Kinshella
- Department of Obstetrics and Gynaecology, BC Children's and Women's Hospital and University of British Columbia, Vancouver, Canada
| | - Shazmeen Omar
- Department of Obstetrics and Gynaecology, BC Children's and Women's Hospital and University of British Columbia, Vancouver, Canada
| | - Kerri Scherbinsky
- Department of Obstetrics and Gynaecology, BC Children's and Women's Hospital and University of British Columbia, Vancouver, Canada
- Department of Pediatrics, Rm170, BC Children's and Women's Hospital, University of British Columbia, 950 West 28th Avenue, Vancouver, Canada
| | - Marianne Vidler
- Department of Obstetrics and Gynaecology, BC Children's and Women's Hospital and University of British Columbia, Vancouver, Canada
| | - Laura A Magee
- Department of Obstetrics and Gynaecology, BC Children's and Women's Hospital and University of British Columbia, Vancouver, Canada
- Department of Women & Children's Health, King's College London, London, UK
| | - Peter von Dadelszen
- Department of Obstetrics and Gynaecology, BC Children's and Women's Hospital and University of British Columbia, Vancouver, Canada
- Department of Women & Children's Health, King's College London, London, UK
| | - Sophie E Moore
- Department of Women & Children's Health, King's College London, London, UK
- MRC Unit The Gambia at the London, School of Hygiene and Tropical Medicine, Fajara, The Gambia
| | - Rajavel Elango
- Department of Pediatrics, Rm170, BC Children's and Women's Hospital, University of British Columbia, 950 West 28th Avenue, Vancouver, Canada.
- School of Population and Public Health, University of British Columbia, Vancouver, Canada.
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8
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Carrasco-Ruiz MF, Ruiz-Rivera A, Soriano-Ursúa MA, Martinez-Hernandez C, Manuel-Apolinar L, Castillo-Hernandez C, Guevara-Balcazar G, Farfán-García ED, Mejia-Ruiz A, Rubio-Gayosso I, Perez-Capistran T. Global longitudinal strain is superior to ejection fraction for detecting myocardial dysfunction in end-stage renal disease with hyperparathyroidism. World J Cardiol 2022; 14:239-249. [PMID: 35582470 PMCID: PMC9048274 DOI: 10.4330/wjc.v14.i4.239] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 01/07/2022] [Accepted: 04/04/2022] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND The estimation of left ventricular ejection fraction (LVEF) by 2D echocardiography (2D-ECHO) is the most used tool to assess LV systolic function (LVSF). Global longitudinal strain (GLS) has recently been suggested as a superior method for several evaluations. This study explored the association and prevalence of LV systolic dysfunction (LVSD) by using these methods in patients with end-stage renal disease (ESRD) and severe hyperparathyroidism (SHPTH); both associated with cardiovascular events (CEs).
AIM To evaluate the myocardial function in patients with ESRD and SHPTH by using the GLS and LVEF measured through conventional 2D-ECHO.
METHODS In 62 patients with ESRD and SHPTH, asymptomatic, and without a history of CEs, LVSF was evaluated by 2D-ECHO, obtaining the EF, by the Simpson biplane method, and GLS by speckle tracking.
RESULTS The total patients with ESRD had a preserved LVEF (> 50%) but abnormal GLS (< 13.55%). Additionally, multivariate analysis showed an independent association of GLS and serum parathyroid hormone (PTH), LV mass index, and hemoglobin. Also, PTH was independently associated with lateral e' wave and tricuspid regurgitation velocity.
CONCLUSION In patients with SHPTH linked to ESRD, the use of GLS by 2D-ECHO is a more sensitive tool than LVEF for detecting LVSD.
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Affiliation(s)
- Maria Fernanda Carrasco-Ruiz
- Department of Physiology, Escuela Superior de Medicina, Instituto Politécnico Nacional, Ciudad de México 11340, Mexico
| | - Antonio Ruiz-Rivera
- Department of Cardiology, Instituto Mexicano del Seguro Social, Ciudad de México 06720, Mexico
| | - Marvin A Soriano-Ursúa
- Department of Physiology, Escuela Superior de Medicina, Instituto Politécnico Nacional, Ciudad de México 11340, Mexico
| | | | - Leticia Manuel-Apolinar
- Endocrine Research Unit, Instituto Mexicano del Seguro Social, Ciudad de México 06720, Mexico
| | - Carmen Castillo-Hernandez
- Department of Cardiovascular Pharmacology, Instituto Politécnico Nacional, Ciudad de México 11340, Mexico
| | - Gustavo Guevara-Balcazar
- Department of Cardiovascular Pharmacology, Instituto Politécnico Nacional, Ciudad de México 11340, Mexico
| | - Eunice D Farfán-García
- Department of Biochemistry, Escuela Superior de Medicina, Instituto Politécnico Nacional, Ciudad de México 11340, Mexico
| | - Ana Mejia-Ruiz
- Education Research, Comisión Nacional Para la Mejora Continua de la Educación, Ciudad de México 03900, Mexico
| | - Ivan Rubio-Gayosso
- Postgraduate Studies and Research Section,Escuela Superior de Medicina, Instituto Politécnico Nacional, Ciudad de México 11340, Mexico
| | - Teresa Perez-Capistran
- Department of Physiology, Escuela Superior de Medicina, Instituto Politécnico Nacional, Ciudad de México 11340, Mexico
- Department of Physiology, Instituto Politécnico Nacional, Mexico City 11340, Ciudad de México, Mexico
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9
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Sivarajah R. Hormonic Notes: Review of Endocrine Basis of Benign Breast Disease. Semin Roentgenol 2022; 57:149-159. [DOI: 10.1053/j.ro.2022.01.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 01/23/2022] [Accepted: 01/24/2022] [Indexed: 11/11/2022]
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10
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Naidoo K, Ngubane PS, Khathi A. Investigating the Effects of Diet-Induced Pre-Diabetes on the Functioning of Calcium-Regulating Organs in Male Sprague Dawley Rats: Effects on Selected Markers. Front Endocrinol (Lausanne) 2022; 13:914189. [PMID: 35898447 PMCID: PMC9309376 DOI: 10.3389/fendo.2022.914189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Accepted: 06/10/2022] [Indexed: 11/13/2022] Open
Abstract
Derangements to the functioning of calcium-regulating organs have been associated with type 2 diabetes mellitus (T2DM), a condition preceded by pre-diabetes. Type 2 diabetes has shown to promote renal calcium wastage, intestinal calcium malabsorption and increased bone resorption. However, the changes to the functioning of calcium-regulating organs in pre-diabetes are not known. Subsequently, the effects of diet-induced pre-diabetes on the functioning of calcium-regulating organs in a rat model for pre-diabetes was investigated in this study. Male Sprague Dawley rats were separated into two groups (n=6, each group): non-pre-diabetic (NPD) group and a diet-induced pre-diabetic (DIPD) group for 20 weeks. After the experimental period, postprandial glucose and HOMA-IR were analysed in addition to plasma and urinary calcium concentrations. Gene expressions of intestinal vitamin D (VDR), intestinal calbindin-D9k, renal 1-alpha hydroxylase and renal transient receptor potential vanilloid 5 (TRPV5) expressions in addition to plasma osteocalcin and urinary deoxypyridinoline concentrations were analysed at week 20. The results demonstrated significantly increased concentrations of postprandial glucose, HOMA-IR and urinary calcium in addition to unchanged plasma calcium levels in the DIPD group by comparison to NPD. Renal TRPV5, renal 1-alpha hydroxylase, intestinal VDR and intestinal calbindin-D9k expressions were increased in the DIPD group by comparison to NPD. Furthermore, plasma osteocalcin levels were increased and urine deoxypyridinoline levels were decreased in the DIPD group by comparison to NPD. These observations may suggest that calcium-regulating organs compensate for the changes to calcium homeostasis by inducing increased renal calcium reabsorption, increased intestinal calcium absorption and decreased bone resorption followed by increased bone formation.
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11
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Xue X, Lu CL, Cheng H, Jin XY, Liu XH, Yang M, Xu WC, Liu Q, Yuan J, Liu JP, Wang XQ. Factor analysis of Traditional Chinese Medicine syndromes and clinical characteristics of patients with secondary hyperparathyroidism maintained by hemodialysis: A cross-sectional study. Eur J Integr Med 2021. [DOI: 10.1016/j.eujim.2021.101373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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12
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Clarke KE, Hurst EA, Mellanby RJ. Vitamin D metabolism and disorders in dogs and cats. J Small Anim Pract 2021; 62:935-947. [PMID: 34323302 DOI: 10.1111/jsap.13401] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2020] [Revised: 06/05/2021] [Accepted: 06/19/2021] [Indexed: 12/20/2022]
Abstract
Vitamin D plays an important role in regulating calcium metabolism and in the development and maintenance of skeletal health of companion animals. There is also a growing interest in understanding the role vitamin D plays in non-skeletal health in both human and veterinary patients. This review provides an update of our current understanding of vitamin D biology in dogs and cats and gives an overview of how vitamin D metabolism can be assessed in companion animals. Congenital and acquired vitamin D disorders are then summarised before the review concludes with a summary of recent studies which have explored the role of vitamin D in the development and outcomes of non-skeletal diseases of dogs and cats.
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Affiliation(s)
- K E Clarke
- Davies Veterinary Specialists, Manor Farm Business Park, Higham Gobion, Hertfordshire, UK
| | - E A Hurst
- Royal (Dick) School of Veterinary Studies and the Roslin Institute, The University of Edinburgh, Easter Bush Campus, Roslin, Midlothian, UK
| | - R J Mellanby
- Royal (Dick) School of Veterinary Studies and the Roslin Institute, The University of Edinburgh, Easter Bush Campus, Roslin, Midlothian, UK
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13
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Atwal J, Stockman J, Gilham M, Allaway D, Renfrew H, Bakke AM, Watson P. No Observed Adverse Effects on Health Were Detected in Adult Beagle Dogs When Fed a High-Calcium Diet for 40 Weeks. Animals (Basel) 2021; 11:ani11061799. [PMID: 34208630 PMCID: PMC8234157 DOI: 10.3390/ani11061799] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Revised: 06/04/2021] [Accepted: 06/11/2021] [Indexed: 11/29/2022] Open
Abstract
Simple Summary Calcium (Ca) is an essential mineral that plays a vital role in many bodily functions. There is evidence that high levels of dietary Ca for puppies and growing dogs can result in adverse growth and health effects, with certain breeds and dog size categories being most susceptible, for example, large breed sizes or beagles. Until recently, little was known about the health consequences of high Ca diets to adult dog, however, a study in the large sized breed Labrador retriever found no adverse health consequences when feeding diets containing levels of Ca near maximum levels set by pet food regulators (2.5 g per 100 g dry matter) for 40 weeks. This current study fed a similar high Ca diet to adult beagles, a medium sized breed for 40 weeks and monitored the dogs’ health using an extensive suite of health parameters. All dogs remained healthy and did not display any clinically relevant signs of adverse health relating to diet at any point during or following completion of the study. Abstract The implications of long-term high calcium (Ca) intake are well documented in growing dogs and in adult dogs of large breed size, however, the consequences on other breeds and breed sizes are yet to be determined. Eighteen neutered adult beagles, nine males and nine females aged 1.4–4.4 years, were randomized to control or test diets providing in g∙4184 kJ−1 (1000 kcal−1): 1.44 and 7.19 total Ca balanced with 1.05 and 4.25 total phosphorus, respectively, for 40 weeks. Health parameters, ultrasound scans, radiographs, glomerular filtration rate, and mineral balance were measured at eight-week intervals. All dogs remained healthy with no measured evidence of orthopedic, urinary, or renal disease. The test diet resulted in a 5.2 fold increase in fecal Ca excretion. Apparent Ca digestibility (%) and Ca balance (g/d) did not significantly (p > 0.05) change from baseline in the test diet group, although dogs displayed a positive Ca balance (maximum at week 8, 1.11 g/d with 95% CI (0.41, 1.80)) before a neutral Ca balance was restored at week 32. Despite an initial positive Ca balance, we can conclude that no measurable adverse health effects were observed as a result of the test diet fed in this study in beagles over a period of 40 weeks.
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Affiliation(s)
- Jujhar Atwal
- WALTHAM Petcare Science Institute, Melton Mowbray, Leicestershire LE14 4RT, UK; (J.S.); (M.G.); (D.A.); (A.M.B.); (P.W.)
- Correspondence:
| | - Jonathan Stockman
- WALTHAM Petcare Science Institute, Melton Mowbray, Leicestershire LE14 4RT, UK; (J.S.); (M.G.); (D.A.); (A.M.B.); (P.W.)
| | - Matthew Gilham
- WALTHAM Petcare Science Institute, Melton Mowbray, Leicestershire LE14 4RT, UK; (J.S.); (M.G.); (D.A.); (A.M.B.); (P.W.)
| | - David Allaway
- WALTHAM Petcare Science Institute, Melton Mowbray, Leicestershire LE14 4RT, UK; (J.S.); (M.G.); (D.A.); (A.M.B.); (P.W.)
| | - Helen Renfrew
- Renfrew Imaging, Grove Road, Bladon, Woodstock OX20 1RD, UK;
| | - Anne Marie Bakke
- WALTHAM Petcare Science Institute, Melton Mowbray, Leicestershire LE14 4RT, UK; (J.S.); (M.G.); (D.A.); (A.M.B.); (P.W.)
| | - Phillip Watson
- WALTHAM Petcare Science Institute, Melton Mowbray, Leicestershire LE14 4RT, UK; (J.S.); (M.G.); (D.A.); (A.M.B.); (P.W.)
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Stockman J, Villaverde C. Concerns related to dietary phosphorus intake in cats. J Am Vet Med Assoc 2021; 258:1325-1331. [PMID: 34061616 DOI: 10.2460/javma.258.12.1325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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15
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Corsini A, Dondi F, Serio DG, Zamagni S, Golinelli S, Fernandez M, Fracassi F. Calcium and phosphate homeostasis in dogs with newly diagnosed naturally occurring hypercortisolism. J Vet Intern Med 2021; 35:1265-1273. [PMID: 33991143 PMCID: PMC8163130 DOI: 10.1111/jvim.16143] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 04/16/2021] [Accepted: 04/16/2021] [Indexed: 01/10/2023] Open
Abstract
Background Hypercortisolism affects calcium and phosphate metabolism in dogs; however, the exact mechanisms are not completely understood. Objectives To evaluate circulating concentrations of whole parathormone (wPTH), 25‐hydroxyvitamin D (25‐(OH)D), calcitriol, and fibroblast growth factor‐23 (FGF‐23) in dogs with naturally occurring hypercortisolism (NOHC) and healthy dogs, and their association with calcium and phosphate homeostasis. Animals Twenty‐three client‐owned dogs with NOHC, and 12 client or staff‐owned healthy dogs. Methods Prospective cross‐sectional study. The circulating concentrations of total calcium, ionized calcium (iCa), phosphate, wPTH, 25‐(OH)D, calcitriol and FGF‐23, and the urinary fractional excretion of phosphate (FEP) and calcium (FECa) were compared between dogs with NOHC before treatment and healthy dogs. Results Dogs with NOHC had higher mean serum phosphate concentrations (4.81 mg/dL, SD ± 0.71 vs 3.86 mg/dL, SD ± 0.60; P < .001), median FECa (0.43%, range, 0.03‐2.44 vs 0.15%, range, 0.06‐0.35; P = .005), and median serum wPTH concentrations (54.6 pg/mL, range, 23.7‐490 vs 24.6 pg/mL, range, 5.5‐56.4; P = .003) as compared to the controls. Circulating concentrations of total calcium, iCa, and calcitriol and the FEP did not differ between groups, whereas the serum 25‐(OH)D concentrations were lower in dogs with NOHC as compared to the controls (70.2 pg/mL, SD ± 42.3 vs 106.3 pg/mL, SD ± 35.3; P = .02). The dogs with NOHC had lower plasma FGF‐23 concentrations than controls (316.6 pg/mL, range, 120.8‐575.6 vs 448.7 pg/mL, range, 244.8‐753; P = .03). Conclusions and Clinical Importance Urine loss of calcium and hyperphosphatemia could contribute to the adrenal secondary hyperparathyroidism.
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Affiliation(s)
- Andrea Corsini
- Department of Veterinary Medical Sciences, Alma Mater Studiorum-University of Bologna, Ozzano Emilia, Italy.,Department of Veterinary Medical Sciences, University of Parma, Parma, Italy
| | - Francesco Dondi
- Department of Veterinary Medical Sciences, Alma Mater Studiorum-University of Bologna, Ozzano Emilia, Italy
| | - Daria G Serio
- Department of Veterinary Medical Sciences, Alma Mater Studiorum-University of Bologna, Ozzano Emilia, Italy
| | - Silvia Zamagni
- Department of Veterinary Medical Sciences, Alma Mater Studiorum-University of Bologna, Ozzano Emilia, Italy
| | - Stefania Golinelli
- Department of Veterinary Medical Sciences, Alma Mater Studiorum-University of Bologna, Ozzano Emilia, Italy
| | - Mercedes Fernandez
- Department of Veterinary Medical Sciences, Alma Mater Studiorum-University of Bologna, Ozzano Emilia, Italy
| | - Federico Fracassi
- Department of Veterinary Medical Sciences, Alma Mater Studiorum-University of Bologna, Ozzano Emilia, Italy
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Titmarsh HF, Woods GA, Cartwright JA, Kilpatrick S, Gaylor D, Berry J, Gow A, Bommer NX, Gunn-Moore D, Handel I, Mellanby RJ. Low vitamin D status is associated with anaemia in hospitalised cats. Vet Rec 2021; 187:e6. [PMID: 33638545 DOI: 10.1136/vr.105626] [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: 07/03/2019] [Revised: 01/03/2020] [Accepted: 01/13/2020] [Indexed: 02/07/2023]
Abstract
BACKGROUND The major physiological role of vitamin D has traditionally been considered to be the regulation of calcium homeostasis and maintenance of skeletal health. However, there is increasing evidence that vitamin D influences a wider range of physiological processes including erythropoiesis. Vitamin D (25-hydroxyvitamin D, 25(OH)D) deficiency concentrations have been associated with anaemia in human beings. In contrast, the relationship between vitamin D status and erythropoiesis has not been investigated in cats. METHODS Clinical records of cats consecutively presenting between November 2013 and February 2015 were reviewed. For each cat, data including sex, age, breed, serum albumin and creatinine concentrations, and appetite scores were extracted. A multivariable linear regression model was constructed to examine the relationship between 25(OH)D concentrations and these variables. RESULTS Cats with anaemia had significantly lower 25(OH)D concentrations (median 49.5 nmol/l, n=31) than cats with packed cell volume above the lower limit of the reference range (median 109.0 nmol/l, n=130) (P<0.001). A binary logistic regression found that red blood cell count and mean corpuscular volume were negatively correlated with serum 25(OH)D concentrations (P<0.001 and P=0.007, respectively). CONCLUSION Vitamin D (25(OH)D) concentration is positively associated with red blood cell count and mean corpuscular volume in cats with a wide range of different illnesses.
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Affiliation(s)
- Helen Faye Titmarsh
- Hospital for Small Animals, Royal Dick School of Veterinary Studies and The Roslin Institute, Edinburgh, UK
| | - Glynn Alan Woods
- Hospital for Small Animals, University of Edinburgh, Edinburgh, UK
| | - Jennifer A Cartwright
- Hospital for Small Animals, Royal Dick School of Veterinary Studies and The Roslin Institute, Edinburgh, UK.,Hospital for Small Animals, University of Edinburgh, Edinburgh, UK
| | - Scott Kilpatrick
- Division of Veterinary Clinical Studies, University of Edinburgh, Edinburgh, UK
| | - Donna Gaylor
- Division of Veterinary Clinical Studies, Royal (Dick) School of Veterinary Studies, Edinburgh, UK
| | - Jaqueline Berry
- Clinical Biochemistry, Manchester Royal Infirmary, Manchester, UK
| | - Adam Gow
- Internal Medicine, University of Edinburgh, Edinburgh, UK
| | - Nick X Bommer
- Division of Veterinary Clinical Studies, Royal (Dick) School of Veterinary Studies, Edinburgh, UK
| | - Danielle Gunn-Moore
- Easter Bush Veterinary Centre, Royal (Dick) School of Veterinary Studies, Edinburgh, UK
| | - Ian Handel
- Centre for Infectious Diseases, University of Edinburgh, Edinburgh, UK
| | - Richard J Mellanby
- Division of Veterinary Clinical Studies, University of Edinburgh, Edinburgh, UK
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Parker VJ. Nutritional Management for Dogs and Cats with Chronic Kidney Disease. Vet Clin North Am Small Anim Pract 2021; 51:685-710. [PMID: 33773648 DOI: 10.1016/j.cvsm.2021.01.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The nutritional management of canine and feline chronic kidney disease and protein-losing nephropathy is discussed. Special attention is paid to assessment of body composition (body weight, body condition score, and muscle condition score) and the dysrexia that often occurs with kidney disease. Various nutrients of concern are discussed and specific dietary options are provided.
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Affiliation(s)
- Valerie J Parker
- The Ohio State University, 601 Vernon L. Tharp Street, Columbus, OH 43210, USA.
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CLINICAL AND PATHOLOGIC FINDINGS OF AN OUTBREAK OF VITAMIN D 3-RESPONSIVE METABOLIC BONE DISEASE IN HERON AND EGRET (FAMILY ARDEIDAE) CHICKS FED CAPELIN ( MALLOTUS VILLOSUS). J Zoo Wildl Med 2021; 51:958-969. [PMID: 33480576 DOI: 10.1638/2019-0238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/08/2020] [Indexed: 11/21/2022] Open
Abstract
An increase in cases of metabolic bone disease (MBD) in chicks of six species of heron and egret (family Ardeidae) was identified at a wildlife rehabilitation center in the spring and summer of 2018. The outbreak affected 34.3% of birds in care for four or more days during the first 3 mo of the study and was the most common reason for euthanasia during that time. Cases were characterized by lameness, increased flexibility of multiple long bones, angular deformities, and bone fractures. Gross postmortem examinations were conducted on 145 nestlings and fledglings that died or were euthanatized either because of MBD or for unrelated conditions. Histology was performed in four cases and three controls. Histologic findings were characterized by multiple lesions in the appendicular long bones, including variable elongation of the physis, retention of cartilage cores in the metaphyseal primary spongiosa, poorly mineralized osteoid seams within the primary spongiosa, thinning or lack of diaphyseal cortical bone compaction, and folding fractures typically propagating through the physis-metaphyseal interface. Folding fractures were often associated with focal metaphyseal fibroplasia. The parathyroid gland diameter of birds diagnosed postmortem with MBD in care was significantly larger than that of unaffected birds. The authors hypothesized that a dietary deficiency of vitamin D3 because of low levels in the bird's captive diet of capelin (Mallotus villosus) was the cause of the MBD. Starting in mid-July every chick's diet was supplemented with 714 IU oral vitamin D3/kg body weight per day, after which the number of birds developing MBD declined to a rate of 4.3%. This study characterizes the clinical, gross, radiographic, and histologic features of vitamin D3-responsive MBD in young herons and egrets and provides evidence to support the recommendation that captive birds on a diet of capelin be supplemented with vitamin D3, especially during growth.
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Analytical and Clinical Validation of a New Immunoenzymatic Method for the Measurement of Canine Parathyroid Hormone. Animals (Basel) 2020; 10:ani10122411. [PMID: 33348538 PMCID: PMC7766972 DOI: 10.3390/ani10122411] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 12/01/2020] [Accepted: 12/14/2020] [Indexed: 11/29/2022] Open
Abstract
Simple Summary In dogs affected with chronic kidney disease (CKD), mineral disorders, including renal hyperparathyroidism (RHPT), are frequent. Secondary RHPT is the increase in serum parathyroid hormone (PTH), that can have a significant impact in the disease progression. Despite its clinical utility, the measurement of serum PTH is not routinely executed due to limited availability of validated methods. The aims of this study were: the analytical validation of a new method for PTH measurement in dogs and analysis of the preliminary association of the obtained results with the renal status. Twenty-seven samples obtained from dogs that were healthy or affected with CKD were analysed. PTH was measured using a commercially available human assay. The precision and accuracy of this method were assessed and the PTH stability at different temperatures was evaluated. Clinical validation was performed by comparing PTH values with clinicopathological parameters often altered during CKD, such as creatinine and phosphorus, and with the disease severity. The method showed an optimal precision and accuracy; the stability was compatible with the standard sample processing times. PTH was positively associated with creatinine and phosphorus. The investigated method was successfully validated in dogs, allowing its use for clinical purposes. Abstract Renal hyperparathyroidism (RHPT) is one of the main complications in dogs affected with Chronic Kidney Disease (CKD). The measurement of serum parathyroid hormone (PTH) could be of clinical utility for the disease’s treatment and follow-up; however, PTH is not routinely determined due to limited available methods, often not fully validated in dogs. The aims of this study were the analytical validation of an immunoenzymatic method for the measurement of PTH in canine serum and the analysis of preliminary association of the obtained results with renal function. Twenty-six samples obtained from dogs healthy or affected with CKD were analysed. PTH was measured using a two-site immunoenzymometric human assay (ST AIA-PACK® Intact PTH, Tosoh Bioscience). The analytical validation protocol evaluated the assay precision and accuracy. Also, the PTH’s storage stability at 20 °C, 4 °C and −20 °C was assessed. Clinical validation was performed by comparing PTH values with creatinine, phosphorus and International Renal Interest Society (IRIS) stage. The method showed optimal precision and accuracy, whereas stability was adequate up to 4 h at 20 °C, 24 h at 4 °C and 6 months at −20 °C. PTH was positively associated with creatinine, phosphorus and IRIS stage. The investigated method was thus successfully validated in dogs, allowing its use for clinical purpose.
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20
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Vitamin D and sleep duration: Is there a bidirectional relationship? Horm Mol Biol Clin Investig 2020; 41:/j/hmbci.ahead-of-print/hmbci-2020-0025/hmbci-2020-0025.xml. [DOI: 10.1515/hmbci-2020-0025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Accepted: 10/26/2020] [Indexed: 11/15/2022]
Abstract
Abstract
Vitamin D contributes to numerous physiological processes within the body but primarily calcium and bone homeostasis. Emerging evidence highlights a novel role for vitamin D in maintaining and regulating optimal sleep. Sleep is a known regulator of bone health, highlighting the interconnectedness between vitamin D concentrations, sleep duration and bone metabolism. It is possible that the relationship between sleep length and vitamin D is bidirectional, with vitamin D playing a role in sleep health and conversely, sleep affecting vitamin D levels. Nevertheless, limited information on the direction of the interaction is available, and much remains to be learned concerning the complex relationship between insufficient sleep duration and vitamin D deficiency. Given the potential to implement interventions to improve sleep and vitamin D supplementation, understanding this relationship further could represent a novel way to support and improve health.
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21
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Vitamin D Metabolism and Its Role in Mineral and Bone Disorders in Chronic Kidney Disease in Humans, Dogs and Cats. Metabolites 2020; 10:metabo10120499. [PMID: 33291777 PMCID: PMC7761928 DOI: 10.3390/metabo10120499] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 11/21/2020] [Accepted: 11/24/2020] [Indexed: 11/17/2022] Open
Abstract
Some differences regarding Vitamin D metabolism are described in dogs and cats in comparison with humans, which may be explained by an evolutionary drive among these species. Similarly, vitamin D is one of the most important regulators of mineral metabolism in dogs and cats, as well as in humans. Mineral metabolism is intrinsically related to bone metabolism, thus disturbances in vitamin D have been implicated in the development of chronic kidney disease mineral and bone disorders (CKD-MBD) in people, in addition to dogs and cats. Vitamin D deficiency may be associated with Renal Secondary Hyperparathyroidism (RSHPT), which is the most common mineral disorder in later stages of CKD in dogs and cats. Herein, we review the peculiarities of vitamin D metabolism in these species in comparison with humans, and the role of vitamin D disturbances in the development of CKD-MBD among dogs, cats, and people. Comparative studies may offer some evidence to help further research about vitamin D metabolism and bone disorders in CKD.
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Zafalon RVA, Ruberti B, Rentas MF, Amaral AR, Vendramini THA, Chacar FC, Kogika MM, Brunetto MA. The Role of Vitamin D in Small Animal Bone Metabolism. Metabolites 2020; 10:E496. [PMID: 33287408 PMCID: PMC7761812 DOI: 10.3390/metabo10120496] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 11/09/2020] [Accepted: 11/10/2020] [Indexed: 12/14/2022] Open
Abstract
Dogs and cats have differences in vitamin D metabolism compared to other mammalian species, as they are unable to perform vitamin D cutaneous synthesis through sun exposure. Therefore, they are dependent on the dietary intake of this nutrient. The classic functions of vitamin D are to stimulate intestinal calcium and phosphate absorption, renal calcium and phosphate reabsorption and regulate bone mineral metabolism. Thus, it is an important nutrient for calcium and phosphorus homeostasis. This review highlights the evidence of the direct and indirect actions of vitamin D on bone mineral metabolism, the consequences of nutritional imbalances of this nutrient in small animals, as well as differences in vitamin D metabolism between different size dogs.
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Affiliation(s)
- Rafael Vessecchi Amorim Zafalon
- Pet Nutrology Research Center, Nutrition and Production Department, School of Veterinary Medicine and Animal Science, University of São Paulo, Jardim Elite, Pirassununga 13635-900, Brazil; (R.V.A.Z.); (M.F.R.); (T.H.A.V.)
| | - Bruna Ruberti
- Small Animal Internal Medicine Service, Veterinary Teaching Hospital, School of Veterinary Medicine and Animal Science, University of São Paulo, Cidade Universitária, São Paulo 05508-270, Brazil; (B.R.); (M.M.K.)
| | - Mariana Fragoso Rentas
- Pet Nutrology Research Center, Nutrition and Production Department, School of Veterinary Medicine and Animal Science, University of São Paulo, Jardim Elite, Pirassununga 13635-900, Brazil; (R.V.A.Z.); (M.F.R.); (T.H.A.V.)
| | - Andressa Rodrigues Amaral
- Veterinary Nutrology Service, Veterinary Teaching Hospital, School of Veterinary Medicine and Animal Science, University of São Paulo, Cidade Universitária, São Paulo 05508-270, Brazil;
| | - Thiago Henrique Annibale Vendramini
- Pet Nutrology Research Center, Nutrition and Production Department, School of Veterinary Medicine and Animal Science, University of São Paulo, Jardim Elite, Pirassununga 13635-900, Brazil; (R.V.A.Z.); (M.F.R.); (T.H.A.V.)
| | - Fernanda Chicharo Chacar
- Department of Internal Medicine, Federal Institute of Education, Science and Technology of South of Minas Gerais, IFSULDEMINAS, Muzambinho 37890-000, Brazil;
| | - Marcia Mery Kogika
- Small Animal Internal Medicine Service, Veterinary Teaching Hospital, School of Veterinary Medicine and Animal Science, University of São Paulo, Cidade Universitária, São Paulo 05508-270, Brazil; (B.R.); (M.M.K.)
| | - Marcio Antonio Brunetto
- Pet Nutrology Research Center, Nutrition and Production Department, School of Veterinary Medicine and Animal Science, University of São Paulo, Jardim Elite, Pirassununga 13635-900, Brazil; (R.V.A.Z.); (M.F.R.); (T.H.A.V.)
- Veterinary Nutrology Service, Veterinary Teaching Hospital, School of Veterinary Medicine and Animal Science, University of São Paulo, Cidade Universitária, São Paulo 05508-270, Brazil;
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Hurst EA, Homer NZ, Mellanby RJ. Vitamin D Metabolism and Profiling in Veterinary Species. Metabolites 2020; 10:E371. [PMID: 32942601 PMCID: PMC7569877 DOI: 10.3390/metabo10090371] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 09/11/2020] [Accepted: 09/13/2020] [Indexed: 12/17/2022] Open
Abstract
The demand for vitamin D analysis in veterinary species is increasing with the growing knowledge of the extra-skeletal role vitamin D plays in health and disease. The circulating 25-hydroxyvitamin-D (25(OH)D) metabolite is used to assess vitamin D status, and the benefits of analysing other metabolites in the complex vitamin D pathway are being discovered in humans. Profiling of the vitamin D pathway by liquid chromatography tandem mass spectrometry (LC-MS/MS) facilitates simultaneous analysis of multiple metabolites in a single sample and over wide dynamic ranges, and this method is now considered the gold-standard for quantifying vitamin D metabolites. However, very few studies report using LC-MS/MS for the analysis of vitamin D metabolites in veterinary species. Given the complexity of the vitamin D pathway and the similarities in the roles of vitamin D in health and disease between humans and companion animals, there is a clear need to establish a comprehensive, reliable method for veterinary analysis that is comparable to that used in human clinical practice. In this review, we highlight the differences in vitamin D metabolism between veterinary species and the benefits of measuring vitamin D metabolites beyond 25(OH)D. Finally, we discuss the analytical challenges in profiling vitamin D in veterinary species with a focus on LC-MS/MS methods.
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Affiliation(s)
- Emma A. Hurst
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, The University of Edinburgh, Easter Bush, Midlothian, Edinburgh, Scotland EH25 9RG, UK;
- Mass Spectrometry Core, Edinburgh Clinical Research Facility, Queen’s Medical Research Institute, The University of Edinburgh, Little France Crescent, Edinburgh, Scotland EH16 4TJ, UK;
| | - Natalie Z. Homer
- Mass Spectrometry Core, Edinburgh Clinical Research Facility, Queen’s Medical Research Institute, The University of Edinburgh, Little France Crescent, Edinburgh, Scotland EH16 4TJ, UK;
| | - Richard J. Mellanby
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, The University of Edinburgh, Easter Bush, Midlothian, Edinburgh, Scotland EH25 9RG, UK;
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Impact of admission serum ionized calcium levels on risk of acute kidney injury in hospitalized patients. Sci Rep 2020; 10:12316. [PMID: 32704054 PMCID: PMC7378261 DOI: 10.1038/s41598-020-69405-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Accepted: 05/22/2020] [Indexed: 01/20/2023] Open
Abstract
This study aimed to investigate the risk of acute kidney injury (AKI) in hospitalized patients based on admission serum ionized calcium levels. This is a cohort study of all hospitalized adult patients, from January 2009 to December 2013 at a tertiary referral hospital, who had available serum ionized calcium at the time of admission. We excluded patients who had end-stage kidney disease or AKI at admission. We stratified admission serum ionized calcium into 6 groups; ≤ 4.39, 4.40-4.59, 4.60-4.79, 4.80-4.99, 5.00-5.19, and ≥ 5.20 mg/dL. We used serum creatinine criterion of KDIGO definition for diagnosis of AKI. We performed logistic regression analysis to assess the risk of in-hospital AKI occurrence based on admission serum ionized calcium, using serum ionized calcium of 5.00-5.19 mg/dL as the reference group. We studied a total of 25,844 hospitalized patients. Of these, 3,294 (12.7%) developed AKI in hospital, and 622 (2.4%) had AKI stage 2 or 3. We observed a U-shaped association between admission serum ionized calcium and in-hospital AKI, with nadir in-hospital AKI was in serum ionized calcium of 5.00-5.19 mg/dL. After adjustment for confounders, low serum ionized calcium of 4.40-4.59, ≤ 4.39 mg/dL and elevated serum ionized calcium ≥ 5.20 mg/dL were associated with increased risk of AKI with odds ratio of 1.33 (95% CI 1.14-1.56), 1.45 (95% CI 1.21-1.74), and 1.26 (95% CI 1.04-1.54), respectively. Both hypocalcemia, and hypercalcemia at the time of admission were associated with an increased risk of hospital-acquired AKI.
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Hurst EA, Homer NZ, Gow AG, Clements DN, Evans H, Gaylor D, Campbell S, Handel I, Mellanby RJ. Vitamin D status is seasonally stable in northern European dogs. Vet Clin Pathol 2020; 49:279-291. [PMID: 32432371 DOI: 10.1111/vcp.12859] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Revised: 08/09/2019] [Accepted: 10/11/2019] [Indexed: 01/21/2023]
Abstract
BACKGROUND Numerous studies in veterinary species have recently linked vitamin D status with nonskeletal health disorders. Previous studies have indicated that dogs cannot produce endogenous vitamin D via cutaneous production and rely solely on dietary intake of vitamin D. The seasonal variation of vitamin D seen in humans due to changes in ultraviolet (UV) exposure, therefore, is unlikely to be replicated in these animals. OBJECTIVES The objective of this study was to investigate the natural variation in 25-hydroxyvitamin-D concentrations in dogs subject to seasonal UV exposure. METHODS This longitudinal study followed 18 healthy dogs fed a standardized diet over 1 year, with blood samples obtained monthly. Two key vitamin D metabolites, 25-hydroxyvitamin-D2 and 25-hydroxyvitamin-D3 , were assessed by liquid chromatography-tandem mass spectrometry in serum samples. Various other biochemical parameters were also measured. Seasonality was assessed using cosinor statistical analysis. RESULTS Although the dogs were subject to seasonally varying UV radiation, 25-hydroxyvitamin-D and related biomarkers (including calcium and parathyroid hormone) remained stable over time and did not follow a seasonal pattern. 25-hydroxyvitamin-D was not positively correlated with exposure to UV radiation. Nonetheless, variation in 25-hydroxyvitamin-D concentrations between individual dogs was detected. CONCLUSIONS Given the standardization of diet, we concluded that the seasonal stability of 25-hydroxyvitamin-D concentration (vitamin D status) was likely a direct result of lack of cutaneous vitamin D production in this species and highlights the importance of dietary intake. The variation in 25-hydroxyvitamin-D concentration between animals warrants further investigation.
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Affiliation(s)
- Emma A Hurst
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, The University of Edinburgh, Edinburgh, UK
| | - Natalie Z Homer
- Mass Spectrometry Core, Edinburgh Clinical Research Facility, Queen's Medical Research Institute, The University of Edinburgh, Edinburgh, UK
| | - Adam G Gow
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, The University of Edinburgh, Edinburgh, UK
| | - Dylan N Clements
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, The University of Edinburgh, Edinburgh, UK
| | - Helen Evans
- Nationwide Specialist Laboratories, Cambridge, UK
| | - Donna Gaylor
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, The University of Edinburgh, Edinburgh, UK
| | - Susan Campbell
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, The University of Edinburgh, Edinburgh, UK
| | - Ian Handel
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, The University of Edinburgh, Edinburgh, UK
| | - Richard J Mellanby
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, The University of Edinburgh, Edinburgh, UK
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Puspitadewi SR, Kusdhany LS, Masulili SLC, Wulandari P, Iskandar HB, Auerkari EI. The Role of Parathyroid Hormone in Alveolar Bone Resorption on Postmenopausal Women. Open Dent J 2020. [DOI: 10.2174/1874210602014010082] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Background:
Postmenopausal women exhibit reduced bone mineralization, which causes bone resorption, including that of alveolar bone. Parathyroid hormone has been shown to play a role in alveolar bone resorption.
Objective:
This study aims to analyze relationships between parathyroid hormone and other factors that may contribute to alveolar bone resorption in postmenopausal women.
Methods:
This cross-sectional study included 82 postmenopausal women aged 50–74 years, who resided in Central and East Jakarta, Indonesia. Subjects' data were obtained through questionnaires, dental examinations, and blood collection for the examination of parathyroid hormone levels by enzyme-linked immunosorbent assay and using panoramic radiography to measure bone resorption.
Results:
Spearman correlation analysis showed a significant correlation between parathyroid hormone level (p = 0.005) and extent of alveolar bone resorption, but age (p = 0.292), menopausal duration (p = 0.244), and number of missing teeth (p = 0.517) were not significantly correlated with the extent of alveolar bone resorption.
Conclusion:
Various factors play a role in the mechanism of bone resorption, so knowing the role of each factor is expected to reduce the effects of alveolar bone resorption that occurs in postmenopause. Among the factors investigated in this study, the parathyroid hormone was the sole factor correlated with postmenopausal alveolar bone resorption.
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Pruszkowska-Przybylska P, Sitek A, Rosset I, Sobalska-Kwapis M, Słomka M, Strapagiel D, Żądzińska E, Morling N. Association of saliva 25(OH)D concentration with body composition and proportion among pre-pubertal and pubertal Polish children. Am J Hum Biol 2020; 32:e23397. [PMID: 32022365 DOI: 10.1002/ajhb.23397] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 01/21/2020] [Accepted: 01/23/2020] [Indexed: 01/06/2023] Open
Abstract
OBJECTIVES Due to increasing problems with obesity and vitamin D deficiency among children, studies that tackle both problems together are needed. METHODS Data were collected from 182 randomly selected children aged 6-13 years in primary schools in central Poland. Measures included anthropometric dimensions, body composition, questionnaires completed by participants' parents, and saliva samples. The level of 25(OH)D was assessed from the saliva samples using an enzyme-linked immunosorbent assay kit. The children were divided into two groups: pre-pubertal (girls below 10 years and boys below 11 years) and pubertal individuals (girls above 10 years and boys above 11 years). RESULTS The 25(OH)D concentrations were higher in late spring (June) among pre-pubertal children than in the autumn (November-December) among pubertal children. The level of 25(OH)D was positively correlated with body cell mass (BCM,%) among all children (pubertal: R = 0.20, P = .044; pre-pubertal: R = 0.23, P = .041) and inversely associated with waist-to-hip ratio (WHR) among pubertal children of both sexes (R = -0.25; P = .031). The stepwise regression analysis revealed that investigation in spring (June) and breastfeeding was associated with increased muscle mass (MM, %) (beta = 0.253, P = .003 and beta = 0.225, P = .005, respectively) and total body water (TBW, %) (beta = 0.276, P = .004 and beta = 0.246, P = .011, respectively) and was associated with decreased body mass index (BMI; beta = -0.222, P = .024 and beta = -0.269, P = .009, respectively) and fat mass (%) (beta = -0.288, P = .003 and beta = -0.266, P = .005, respectively). CONCLUSIONS Season of salivary sampling and breastfeeding status were more strongly associated with body components, BMI and WHR, than 25(OH)D concentrations.
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Affiliation(s)
| | - Aneta Sitek
- Department of Anthropology, Faculty of Biology and Environmental Protection, University of Łódź, Łódź, Poland
| | - Iwona Rosset
- Department of Anthropology, Faculty of Biology and Environmental Protection, University of Łódź, Łódź, Poland
| | - Marta Sobalska-Kwapis
- The Biobank Lab, Department of Molecular Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland.,BBMRI.pl Consortium, Wrocław, Poland
| | - Marcin Słomka
- The Biobank Lab, Department of Molecular Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland.,BBMRI.pl Consortium, Wrocław, Poland
| | - Dominik Strapagiel
- The Biobank Lab, Department of Molecular Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland.,BBMRI.pl Consortium, Wrocław, Poland
| | - Elżbieta Żądzińska
- Department of Anthropology, Faculty of Biology and Environmental Protection, University of Łódź, Łódź, Poland.,Biological Anthropology and Comparative Anatomy Research Unit, School of Medicine, The University of Adelaide, Adelaide, Australia
| | - Niels Morling
- Section of Forensic Genetics, Department of Forensic Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
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Zafalon RVA, Risolia LW, Vendramini THA, Ayres Rodrigues RB, Pedrinelli V, Teixeira FA, Rentas MF, Perini MP, Alvarenga IC, Brunetto MA. Nutritional inadequacies in commercial vegan foods for dogs and cats. PLoS One 2020; 15:e0227046. [PMID: 31951617 PMCID: PMC6968870 DOI: 10.1371/journal.pone.0227046] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Accepted: 12/10/2019] [Indexed: 01/08/2023] Open
Abstract
The objective of this study was to evaluate the macronutrients composition, fatty acid and amino acid profiles, and essential minerals content of all vegan foods for dogs and cats available in the Brazilian market, and to compare results with FEDIAF (2019) and AAFCO (2019) recommendations. Four vegan pet foods were assessed (three for dogs and one for cats). The comparisons were made in a descriptive manner. All foods met the minimum recommendations for macronutrients. Arachidonic acid was not reported in any food label. Regarding the FEDIAF recommendations, one food for dogs had low calcium, another had low potassium and a third had low sodium. The cat food presented potassium content lower than recommended. The Ca:P ratio did not meet the minimum recommendation of FEDIAF (2019) and AAFCO (2019) in any of the dog’s foods analyzed, and the cat food also did not present the minimum recommendation based on FEDIAF (2019). Copper concentrations exceeded the legal limit in all foods. Zinc concentrations exceeded this limit in two foods (one for dogs and one for cats) and iron levels exceeded the legal limit in one dog food. One of the dog foods did not meet the minimum recommendation for methionine and the cat food did not meet the minimum recommendation for arginine. In addition, when the amount of nutrients consumed by animals with low energy requirements was simulated, in addition to the same non-conformities described above, it was observed that the cat food does not meet the minimum recommended of protein and taurine in unit/Kg0.67. It was concluded that all foods analyzed had one or more nutrients below the recommended levels and some presented zinc and copper excess, therefore, these foods should not be recommended for dogs and cats, because dietary deficiencies found may lead to health risks for dogs and cats. Furthermore, manufacturers should review their formulations to ensure the nutritional adequacy of these foods.
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Affiliation(s)
| | - Larissa Wünsche Risolia
- School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Pirassununga, Brazil
| | | | | | - Vivian Pedrinelli
- School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Pirassununga, Brazil
| | - Fabio Alves Teixeira
- School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Pirassununga, Brazil
| | - Mariana Fragoso Rentas
- School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Pirassununga, Brazil
| | - Mariana Pamplona Perini
- School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Pirassununga, Brazil
| | - Isabella Corsato Alvarenga
- Department of Grain Science and Industry, Kansas State University, Manhattan, Kansas, United States of America
| | - Marcio Antonio Brunetto
- School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Pirassununga, Brazil
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Zafalon RVA, Risolia LW, Pedrinelli V, Vendramini THA, Rodrigues RBA, Amaral AR, Kogika MM, Brunetto MA. Vitamin D metabolism in dogs and cats and its relation to diseases not associated with bone metabolism. J Anim Physiol Anim Nutr (Berl) 2019; 104:322-342. [PMID: 31803981 DOI: 10.1111/jpn.13259] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Revised: 09/27/2019] [Accepted: 11/02/2019] [Indexed: 12/11/2022]
Abstract
Due to the presence of receptors in the cells of numerous body tissues, vitamin D is associated with several physiological functions that go beyond calcium and phosphorus homoeostasis and control of bone metabolism in the body. In humans, several studies have associated lower vitamin D concentrations with numerous diseases, such as cancer, heart disease, autoimmune diseases and infectious diseases, and also with an increase in the total mortality rate of the population. Recently, this nutrient started to gain importance in veterinary medicine, and several articles have shown a correlation between low vitamin D status and diseases unrelated to bone metabolism. The present review aims to highlight the recent publications that investigated this relationship, bringing the evidence that exists so far in dogs and cats.
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Affiliation(s)
- Rafael V A Zafalon
- School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Brazil
| | - Larissa W Risolia
- School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Brazil
| | - Vivian Pedrinelli
- School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Brazil
| | - Thiago H A Vendramini
- School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Brazil
| | - Roberta B A Rodrigues
- School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Brazil
| | - Andressa R Amaral
- School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Brazil
| | - Marcia M Kogika
- School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Brazil
| | - Marcio A Brunetto
- School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Brazil
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El-Kholey MMAE, Ibrahim GES, Elshahat OI, El-Kannishy G. Impact of Subtotal Parathyroidectomy on Clinical Parameters and Quality of Life in Hemodialysis Patients with Secondary Hyperparathyroidism. Endocrinol Metab (Seoul) 2019; 34:367-373. [PMID: 31884736 PMCID: PMC6935777 DOI: 10.3803/enm.2019.34.4.367] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Revised: 07/30/2019] [Accepted: 09/24/2019] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Impairment of quality of life (QOL) is a key clinical characteristic of patients with end-stage renal disease (ESRD), and can be especially severe in the presence of secondary hyperparathyroidism (SHPT). Despite the proven success of parathyroidectomy (PTX) in controlling biochemical parameters in patients with severe SHPT, evidence is lacking regarding the effects of PTX on various clinical outcomes, including QOL. METHODS Twenty ESRD patients on maintenance hemodialysis with SHPT who underwent subtotal PTX were included in an observational longitudinal study. All studied patients underwent history-taking, clinical examinations, and laboratory investigations, including a complete blood count and measurements of serum calcium, phosphorus, magnesium, parathyroid hormone (PTH), and albumin levels preoperatively and at 3 months postoperatively. QOL was assessed before surgery and at 3 months after surgery using the Kidney Disease Quality of Life 36-Item Short-Form instrument. RESULTS After PTX, significant decreases in serum PTH and phosphorus levels were observed, as well as a significant increase in serum magnesium levels. Significant weight gain and improvements of QOL were also detected postoperatively. CONCLUSION Subtotal PTX seems to be an efficient alternative to medical management in uncontrolled cases of SHPT, as it is capable of controlling the biochemical derangements that occur in hyperparathyroidism. Furthermore, PTX had a beneficial effect on clinical outcomes, as shown by weight gain and improvements in all QOL scales.
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Affiliation(s)
| | - Ghada El Said Ibrahim
- Mansoura Nephrology and Dialysis Unit (MNDU), Mansoura Faculty of Medicine, Mansoura, Egypt
| | | | - Ghada El-Kannishy
- Mansoura Nephrology and Dialysis Unit (MNDU), Mansoura Faculty of Medicine, Mansoura, Egypt.
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Cardoso PG, Pinto MP, Moroz LR, Fontes TN, Santos RS, Freitas JL, Nogueira VA, Peixoto TC. Dystrophic mineralization in uremic dogs: an update. PESQUISA VETERINÁRIA BRASILEIRA 2019. [DOI: 10.1590/1678-5150-pvb-6250] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
ABSTRACT: Pathological mineralization is the abnormal deposition of minerals in body tissues, previously injured or not. In these lesions, in addition to calcium, other minerals can be found at lower concentrations. Classically, mineralization is divided into two types: dystrophic and metastatic. However, currently, there is no consensus among researchers on the type of mineralization that occurs in uremic dogs. The objective of this study was to elucidate the type of pathological mineralization that occurs in dogs with uremic syndrome through the correlation of biochemical examinations with gross and histopathological changes, given the existence of controversial information on this theme in the specialized literature. The Shapiro-Wilk, D’Agostino and Pearson tests were used to evaluate data normality distribution, and analysis of variance (ANOVA) was applied to compare the data between more than two groups. Additionally, the Dunnett’s multiple comparison test was used in the comparison between the Control Group (CG) and the Experimental Groups (G1, G2, and G3). Serum levels of urea, creatinine, total and ionized calcium, phosphorus, calcium-phosphorus product (CPP), parathyroid hormone (PTH), and albumin of 40 azotemic dogs with chronic kidney disease (CKD) were evaluated. Dogs were categorized by degree of azotemia (mild, moderate, and severe). Ionized hypocalcemia was observed in 97.5% (39/40) of the dogs, and no animals presented ionized hypercalcemia. Hyperphosphatemia was frequent (62.5%), especially in dogs with severe azotemia. PTH concentration increased with progression of azotemia, and high PTH levels were verified in 100% of the dogs with severe azotemia. CPP >60mg2/dl2 was observed in 75% (30/40) of the dogs. Of the 29 dogs that died during the study period, 16 were necropsied. Soft tissue mineralization was observed in 93.7% (15/16) of these dogs at gross and histopathological evaluation (HE and Von Kossa), regardless of the degree of azotemia, in nine organs/tissues: kidneys (75%), lungs (50%), stomach (31.2%), heart (25%), larynx (25%), intercostal muscles (25%), aorta (6.2%), intestines (6.2%), and tongue (6.2%). In one animal, the serosa of all segments of the small intestine showed whitish, rough, irregular, multifocal plaques of varying sizes, confirmed by histopathology as dystrophic mineralization of the longitudinal outer muscular layer, which presented necrosis of coagulation and of the intestinal serosa. This intestinal lesion has not been described in dogs with uremic syndrome to date. In conclusion, the laboratory and histopathologic data previously described, especially regarding tissue and vascular mineralization, which occur in association with previous degenerative/necrotic lesions in the absence of hypercalcemia in dogs with CKD, assist with clarifying inconsistencies found in the existing literature. Therefore, conceptually, mineralization that occurs in uremic dogs should be considered dystrophic.
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Mick PJ, Peng SA, Loftus JP. Serum Vitamin D Metabolites and CXCL10 Concentrations Associate With Survival in Dogs With Immune Mediated Disease. Front Vet Sci 2019; 6:247. [PMID: 31417914 PMCID: PMC6682597 DOI: 10.3389/fvets.2019.00247] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Accepted: 07/09/2019] [Indexed: 12/29/2022] Open
Abstract
Background: Low vitamin D increases the risk of immune-mediated disease (IMD) in human beings and rodent models. Vitamin D metabolites, particularly 1,25(OH)2D3, modulate gene expression of immune cells and may attenuate immune pathways that drive IMD. Hypothesis/objectives: Our primary hypothesis was that serum 25(OH)D3 and 1,25(OH)2D3, are reduced in patients with IMD and associate with poorer outcomes. We secondarily hypothesized serum 24,25(OH)2D3 would not be associated with disease or outcome. We also measured serum CXCL10 concentrations to determine if an increase occurs in dogs with IMD and in association with poorer survival. Animals: We enrolled dogs diagnosed with IMD (n = 29) and healthy control dogs (n = 9) in the study with informed client consent. Methods: Serum was collected and stored at −80°C until analyses. Serum vitamin D metabolites were measured by LC-MS/MS by an accredited laboratory. A commercially available canine-specific ELISA kit measured serum CXCL10. Results: Serum 25(OH)D3 and 1,25(OH)2D3 were significantly reduced in dogs (n = 25) with IMD. Serum CXCL10 concentrations undetectable in all controls, and were 30 times higher overall in IMD dogs (n = 25; P = 0.004). CXL10 was, however, undetectable in 40% of dogs with IMD. Of the 60% of IMD dogs with increased CXCL10 concentrations, 5/25 had concentrations at the upper limit of quantification. The survival of those five dogs was significantly (P = 0.049) shorter (72 days) than all other dogs with IMD with measured CXCL10 concentrations. The median survival time (MST) for dogs with 25(OH)D3 concentrations ≤ the median was 106 days, while dogs with concentrations of 25(OH)D3 > the median did not achieve an MST. Conclusions and clinical importance: Serum 25(OH)D3 and 1,25(OH)2D3, but not 24,25(OH)2D3 levels are reduced dogs with IMD. Vitamin D metabolites and CXCL10 may be useful prognostic markers and may be targets for adjunct therapy in canine IMD. These data support the future investigation of vitamin D analogs in the treatment of canine IMD.
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Affiliation(s)
- Phillip J Mick
- Department of Clinical Sciences, Cornell University, Ithaca, NY, United States
| | - Seth A Peng
- Department of Clinical Sciences, Cornell University, Ithaca, NY, United States
| | - John P Loftus
- Department of Clinical Sciences, Cornell University, Ithaca, NY, United States
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Singh A, Giuffrida MA, Thomson CB, Baum J, Kramek B, Liptak JM, Hyndman P, Ringwood B, Smeak D, Ham K, Berg J, Thieman-Mankin K, Blois SL, Boston SE. Perioperative characteristics, histological diagnosis, and outcome in cats undergoing surgical treatment of primary hyperparathyroidism. Vet Surg 2019; 48:367-374. [PMID: 30666680 DOI: 10.1111/vsu.13165] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Revised: 11/08/2018] [Accepted: 12/24/2018] [Indexed: 01/02/2023]
Abstract
OBJECTIVE To report perioperative characteristics, complications, histopathologic diagnosis and outcome in cats undergoing surgical treatment for primary hyperparathyroidism (PHPT). STUDY DESIGN Multi-institutional, retrospective case series. ANIMALS Thirty-two client-owned cats. METHODS Medical records of cats treated with surgical removal of 1 or more parathyroid gland(s) with confirmed histopathologic evaluation were reviewed. Cats were divided into preoperative ionized calcium (iCa) groups corresponding to the 33rd, 67th, and 100th percentiles of the preoperative iCa results of the study population. Follow-up consisted of phone conversation with owners or primary veterinarian. RESULTS Ionized calcium was above reference range in all cats (median 1.8 mmol/L [interquartile range, 1.5-1.9]). Abnormal tissue was excised after cervical exploration in all cats. The most common histopathologic diagnoses were parathyroid adenoma in 20 of 32 (62.5%) cats and parathyroid carcinoma in 7 of 32 (21.9%) cats. At discharge, 6 of 32 (18.8%) cats had hypercalcemia, 5 of 32 (15.6%) had hypocalcemia, and 21 of 32 (65.6%) were normocalcemic. Preoperative iCa did not correlate with postoperative iCa. The median follow-up time was 332 days (range, 7-3156). Overall median survival time was 1109 days (95% CI, 856-1332). Survival time was not associated with preoperative iCa group, hypocalcemia at discharge, hypercalcemia at discharge, or diagnosis of carcinoma. CONCLUSION In this cohort of cats, parathyroid adenoma was the most common cause of PHPT, and surgical treatment resulted in very good median survival time. Preoperative iCa was not predictive of postoperative hypocalcemia. CLINICAL SIGNIFICANCE Surgical parathyroidectomy for treatment of PHPT in cats provides a favorable prognosis.
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Affiliation(s)
- Ameet Singh
- Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
| | - Michelle A Giuffrida
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California-Davis, Davis, California
| | - Christopher B Thomson
- Department of Veterinary Clinical Sciences, University of Minnesota, St Paul, Minnesota
| | - Jared Baum
- Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
| | - Betty Kramek
- Department of Veterinary Clinical Sciences, University of Minnesota, St Paul, Minnesota
| | - Julius M Liptak
- Department of Surgery, VCA Canada-Alta Vista Animal Hospital, Ottawa, Ontario, Canada
| | - Philip Hyndman
- Department of Surgery, Veterinary Emergency Clinic, Toronto, Ontario, Canada
| | - Brendon Ringwood
- Department of Veterinary Clinical Sciences, University of Minnesota, St Paul, Minnesota
| | - Daniel Smeak
- Department of Clinical Sciences, Colorado State University, Fort Collins, Colorado
| | - Kathleen Ham
- Department of Veterinary Clinical Sciences, The Ohio State University, Columbus, Ohio
| | - John Berg
- Department of Clinical Sciences, Tufts University, North Grafton, Massachusetts
| | - Kelley Thieman-Mankin
- Department of Small Animal Clinical Sciences, Texas A&M University, College Station, Texas
| | - Shauna L Blois
- Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
| | - Sarah E Boston
- VCA Canada-404 Veterinary Emergency and Referral, Newmarket, Ontario, Canada
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Sakolish C, Weber EJ, Kelly EJ, Himmelfarb J, Mouneimne R, Grimm FA, House JS, Wade T, Han A, Chiu WA, Rusyn I. Technology Transfer of the Microphysiological Systems: A Case Study of the Human Proximal Tubule Tissue Chip. Sci Rep 2018; 8:14882. [PMID: 30291268 PMCID: PMC6173737 DOI: 10.1038/s41598-018-33099-2] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Accepted: 09/21/2018] [Indexed: 01/08/2023] Open
Abstract
The adoption of a new technology into basic research, and industrial and clinical settings requires rigorous testing to build confidence in the reproducibility, reliability, robustness, and relevance of these models. Tissue chips are promising new technology, they have the potential to serve as a valuable tool in biomedical research, as well as pharmaceutical development with regards to testing for efficacy and safety. The principal goals of this study were to validate a previously established proximal tubule tissue chip model in an independent laboratory and to extend its utility to testing of nephrotoxic compounds. Here, we evaluated critical endpoints from the tissue chip developer laboratory, focusing on biological relevance (long-term viability, baseline protein and gene expression, ammoniagenesis, and vitamin D metabolism), and toxicity biomarkers. Tissue chip experiments were conducted in parallel with traditional 2D culture conditions using two different renal proximal tubule epithelial cell sources. The results of these studies were then compared to the findings reported by the tissue chip developers. While the overall transferability of this advanced tissue chip platform was a success, the reproducibility with the original report was greatly dependent on the cell source. This study demonstrates critical importance of developing microphysiological platforms using renewable cell sources.
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Affiliation(s)
- Courtney Sakolish
- Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, TX, USA
| | - Elijah J Weber
- Department of Pharmaceutics, University of Washington, Seattle, WA, USA
| | - Edward J Kelly
- Department of Pharmaceutics, University of Washington, Seattle, WA, USA
| | - Jonathan Himmelfarb
- Division of Nephrology, University of Washington Kidney Research Institute, Seattle, WA, USA
| | - Roula Mouneimne
- Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, TX, USA
| | - Fabian A Grimm
- Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, TX, USA
| | - John S House
- Bioinformatics Research Center, North Carolina State University, Raleigh, NC, USA
| | - Terry Wade
- Geochemical and Environmental Research Group, Texas A&M University, College Station, TX, USA
| | - Arum Han
- Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX, USA
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA
| | - Weihsueh A Chiu
- Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, TX, USA
| | - Ivan Rusyn
- Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, TX, USA.
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Kiefer-Hecker B, Bauer A, Dobenecker B. Effects of low phosphorus intake on serum calcium, phosphorus, alkaline phosphatase activity and parathyroid hormone in growing dogs. J Anim Physiol Anim Nutr (Berl) 2018; 102:1749-1758. [PMID: 30144171 DOI: 10.1111/jpn.12964] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Revised: 06/20/2018] [Accepted: 06/29/2018] [Indexed: 12/28/2022]
Abstract
A sufficient and balanced supply of calcium and phosphorus is important mainly for the skeletal health of dogs, especially during growth. Numerous reports and research results are quoted, which focus mainly on the effects of both deficient or excessive calcium supplies. The important role that phosphorus plays in the disruption to skeletal development is also explored. The aims of this study were to evaluate the effects of a low phosphorus supply on selected serum parameters of calcium and phosphorus metabolism in both medium and large breed growing dogs, alongside the effects on the apparent digestibility and retention of these minerals as well as the musculoskeletal development, which were published before. Beagle and Foxhound-crossbred puppies (n = 53) between the age of 6 and 24 weeks were either fed a balanced (control) or a low phosphorus diet, the latter one providing about one-third of P amount fed to the control group. In regular intervals, blood samples were obtained to measure serum levels of phosphorus, calcium, alkaline phosphatase activity (ALP) and parathyroid hormone (PTH). Functional Additive Mixed Models were used to analyse these serum concentrations per group and per diet. In the puppies being fed the low phosphorus diet, a distinct decline of serum phosphate concentration was detected with a more pronounced and prolonged effect in the smaller Beagles. At the same time, serum calcium concentration altered in the opposite direction, implying that the product of calcium multiplied by phosphorus was regulated more closely than the calcium to phosphorus ratio. The PTH concentrations were reduced and ALP activity increased at certain time points during the low phosphorus feeding compared to the puppies being fed the control diet. In the latter group, an effect of time or maturation could be demonstrated in relation to the serum phosphate concentration.
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Affiliation(s)
- Britta Kiefer-Hecker
- Department of Veterinary Sciences, Chair of Animal Nutrition and Dietetics, Ludwig-Maximilians-University, Oberschleissheim, Germany
| | - Alexander Bauer
- Statistical Consulting Unit StaBLab, Department of Statistics, Ludwig-Maximilians-Universität München, München, Germany
| | - Britta Dobenecker
- Department of Veterinary Sciences, Chair of Animal Nutrition and Dietetics, Ludwig-Maximilians-University, Oberschleissheim, Germany
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Mitra P, Maity B, Pal DK, Das M. Polymorphisms of PTH (Parathyroid Hormone) Gene and Risk of Kidney Stone Disease: A Case-Control Study from West Bengal, India. Urology 2018; 121:79-85. [PMID: 29969593 DOI: 10.1016/j.urology.2018.06.033] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Revised: 05/31/2018] [Accepted: 06/18/2018] [Indexed: 02/07/2023]
Abstract
OBJECTIVE To investigate the potential contribution of parathyroid hormone (PTH) gene polymorphisms in kidney stone disease (KSD), a global clinical problem impacting major burden on public health care system worldwide. METHODS A case-control study was performed in West Bengal (India) with 152 patients reported with calcium-rich stone in kidney and 144 corresponding normal healthy individuals as controls. To identify genetic variants of PTH, the entire coding region, exon-intron boundaries and a few hundred nucleotides downstream the exon 3 (3' UTR region) was bi-directionally sequenced for all the study participants. RESULTS Two intronic (rs694 and rs6254) and one synonymous (rs6256, located in exon 3) variant were identified along with 2 single nucleotide polymorphisms (SNPs) (rs307247 and rs307248) in the 3' UTR of the PTH gene. Allele and genotype frequency analysis of these SNPs revealed that rs6254 and rs6256 had moderate association with increased risk of KSD. The 2 SNPs (rs307247 and rs307248) of the 3' UTR, which were in strong linkage disequilibrium, were found to be significantly associated with kidney stone risk in the population of West Bengal, India. CONCLUSION This is the first time report in the world, regarding association of PTH gene polymorphisms with KSD. Our finding suggests that PTH gene polymorphisms can be used as potential genetic markers for early detection of KSD and for preventing its occurrence. Additional studies with larger sample size are essential to validate our result.
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Affiliation(s)
- Pubali Mitra
- Department of Zoology, University of Calcutta, West Bengal, India.
| | - Biswanath Maity
- Department of Zoology, University of Calcutta, West Bengal, India; Translational Cell Biology Unit, Centre of Biomedical Research; Uttar Pradesh, India
| | - Dilip Kumar Pal
- Department of Urology, Institute of Post Graduate Medical Education & Research, West Bengal, India
| | - Madhusudan Das
- Department of Zoology, University of Calcutta, West Bengal, India.
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Chacar F, Kogika M, Sanches TR, Caragelasco D, Martorelli C, Rodrigues C, Capcha JMC, Chew D, Andrade L. Urinary Tamm-Horsfall protein, albumin, vitamin D-binding protein, and retinol-binding protein as early biomarkers of chronic kidney disease in dogs. Physiol Rep 2018; 5:5/11/e13262. [PMID: 28576851 PMCID: PMC5471429 DOI: 10.14814/phy2.13262] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2017] [Revised: 03/27/2017] [Accepted: 03/28/2017] [Indexed: 01/06/2023] Open
Abstract
Proteinuria is a marker and mediator of chronic kidney disease (CKD). In clinical practice, the urinary protein‐to‐creatinine ratio (UP/C) is of limited usefulness, because it indicates only the magnitude of proteinuria and not the origin of the loss (glomerular or tubular). The complete assessment of proteinuria includes quantitative and qualitative evaluations, both of which are required in order to optimize the therapy. In addition to measuring the UP/C, we performed SDS‐PAGE and western blotting to determine the expression of albumin, vitamin D‐binding protein (VDBP), retinol‐binding protein (RBP), and Tamm‐Horsfall protein (THP) in urine samples of 49 dogs: healthy (control) dogs (n = 9); and dogs with CKD (n = 40), stratified by stage. In the dogs with stage 3 or 4 CKD, there was a predominance of tubular proteins. Neither VDBP nor RBP was observed in the urine of the control dogs. Among the dogs with stage 1 or 2 CKD, VDBP and RBP were detected in those without proteinuria or with borderline proteinuria. The expression of urinary albumin was significantly higher in the stage 4 group than in any other group (P ≤ 0.01). In the stage 4 group, urinary THP was either undetectable or lower than in the control group (P ≤ 0.01). In conclusion, urinary VDBP and RBP might act as early markers of kidney injury, and a decrease in urinary THP could be an indicator of CKD progression.
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Affiliation(s)
- Fernanda Chacar
- Department of Veterinary Internal Medicine, School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Brazil
| | - Márcia Kogika
- Department of Veterinary Internal Medicine, School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Brazil
| | - Talita R Sanches
- Division of Nephrology, School of Medicine, University of São Paulo, São Paulo, Brazil
| | - Douglas Caragelasco
- Department of Veterinary Internal Medicine, School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Brazil
| | - Cínthia Martorelli
- Department of Veterinary Internal Medicine, School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Brazil
| | - Camila Rodrigues
- Division of Nephrology, School of Medicine, University of São Paulo, São Paulo, Brazil
| | - Jose Manuel C Capcha
- Division of Nephrology, School of Medicine, University of São Paulo, São Paulo, Brazil
| | - Dennis Chew
- Department of Veterinary Clinical Sciences, Ohio State University, Columbus, Ohio
| | - Lúcia Andrade
- Division of Nephrology, School of Medicine, University of São Paulo, São Paulo, Brazil
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Armstrong AJ, Hauptman JG, Stanley BJ, Klocke E, Burneko M, Holt DE, Runge JJ, Rubin JA. Effect of Prophylactic Calcitriol Administration on Serum Ionized Calcium Concentrations after Parathyroidectomy: 78 Cases (2005-2015). J Vet Intern Med 2017; 32:99-106. [PMID: 29280194 PMCID: PMC5787196 DOI: 10.1111/jvim.15028] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2017] [Revised: 11/07/2017] [Accepted: 11/28/2017] [Indexed: 01/24/2023] Open
Abstract
Background Prophylactic administration of calcitriol has been suggested to mitigate the risk of hypocalcemia after parathyroidectomy. The effect of calcitriol on postoperative serum ionized calcium concentrations has not been evaluated in dogs after parathyroidectomy. Hypothesis/Objectives To determine the effect of prophylactic calcitriol administration on postoperative serum ionized calcium (iCa) concentrations in dogs with primary hyperthyroidism (PHPTH) treated by parathyroidectomy. Animals Seventy‐eight dogs with primary hyperparathyroidism treated surgically. Methods Multi‐institutional retrospective case study. Medical records from 2005 to 2015 were evaluated. Dogs were included if they had a diagnosis of PHPTH and had surgery to remove parathyroid tissue. Serum iCa concentrations were monitored for a minimum of 2 days postoperatively. Two study groups were evaluated: calcitriol administration and no calcitriol administration. Results Serial postoperative iCa concentrations measured at 12‐hour time intervals for 2 days postoperatively were positively associated with preoperative iCa concentrations. This association was evident at each time interval, and the effect of preoperative iCa concentrations on postoperative iCa concentrations decreased as time elapsed (12 hours, P < 0.0001; 24 hours, P < 0.0001; 36 hours, P < 0.04; and 48 hours, P = 0.01). Prophylactic calcitriol administration was not found to be significantly associated with postoperative iCa concentrations or its rate of decrease after parathyroidectomy. Conclusion and Clinical Importance We found no protective value in administering calcitriol prophylactically to prevent hypocalcemia in the immediate postoperative period (48 hours) after parathyroidectomy. Preoperative iCa concentrations had a significant positive association with postoperative iCa concentrations throughout the monitoring period.
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Affiliation(s)
- A J Armstrong
- Department of Small Animal Clinical Studies, Michigan State University, East Lansing, MI
| | - J G Hauptman
- Department of Small Animal Clinical Studies, Michigan State University, East Lansing, MI
| | - B J Stanley
- Department of Small Animal Clinical Studies, Michigan State University, East Lansing, MI
| | - E Klocke
- Department of Clinical Sciences, College of Veterinary Medicine, Kansas State University, Manhattan, KS
| | - M Burneko
- Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA
| | - D E Holt
- Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA
| | - J J Runge
- Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA
| | - J A Rubin
- Department of Small Animal Clinical Studies, Michigan State University, East Lansing, MI
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Martorelli CR, Kogika MM, Chacar FC, Caragelasco DS, de Campos Fonseca Pinto ACB, Lorigados CAB, Andrade LC. Urinary Fractional Excretion of Phosphorus in Dogs with Spontaneous Chronic Kidney Disease. Vet Sci 2017; 4:vetsci4040067. [PMID: 29240673 PMCID: PMC5753647 DOI: 10.3390/vetsci4040067] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Revised: 12/04/2017] [Accepted: 12/11/2017] [Indexed: 11/16/2022] Open
Abstract
The increase of urinary fractional excretion of phosphorus (uFEP) may indicate phosphorus retention before the onset of hyperphosphatemia in the early stages of chronic kidney disease (CKD). The hypothesis of this study is whether uFEP may increase during the early stage of CKD as a compensatory mechanism to prevent hyperphosphatemia as well as whether hyperphosphatemia in the late stages is associated with increase or decrease in uFEP in dogs with naturally occurring CKD; therefore, the aim of this study was to determine the uFEP in CKD dogs with different stages. Forty-nine CKD dogs were included, and they were divided into stage 1 (serum creatinine < 1.4 mg/dL), stage 2 (serum creatinine 1.5 to 2.0 mg/dL), stage 3 (serum creatinine 2.1 to 5.0 mg/dL) and stage 4 (serum creatinine > 5.0 mg/dL), according to the IRIS staging criteria. The stage 3 was subdivided into stage 3-A (serum creatinine 2.1 to 3.5 mg/dL) and stage 3-B (serum creatinine 3.6 to 5.0 mg/dL). The control group comprised 10 dogs, and uFEP ≤ 40% was considered as normal. A progressive increase in uFEP along the progression of CKD was found. However, similar results of uFEP levels were observed in late CKD, since there were no differences between stages 3 (A, B) and 4. Interestingly, some CKD dogs with stage 4 showed normal or reduced uFEP, besides hyperphosphatemia; conversely, some dogs in early CKD had increased uFEP values and normophosphatemia. Our findings suggest that uFEP may act as a compensatory mechanism to avoid the onset of hyperphosphatemia in early CKD, but not in later stages. uFEP assessment may be considered as an additional tool for the diagnostic and monitoring of phosphate disorders in dogs with CKD, since it may help to identify disturbances of phosphorus balance. More studies are needed to elucidate the role of uFEP in phosphorus homeostasis in dogs with CKD.
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Affiliation(s)
- Cínthia Ribas Martorelli
- Department of Veterinary Internal Medicine, School of Veterinary Medicine and Animal Science, University of São Paulo, Av. Prof. Dr. Orlando Marques de Paiva, 87, São Paulo, SP 05508-270, Brazil.
| | - Márcia Mery Kogika
- Department of Veterinary Internal Medicine, School of Veterinary Medicine and Animal Science, University of São Paulo, Av. Prof. Dr. Orlando Marques de Paiva, 87, São Paulo, SP 05508-270, Brazil.
| | - Fernanda Chicharo Chacar
- Department of Veterinary Internal Medicine, School of Veterinary Medicine and Animal Science, University of São Paulo, Av. Prof. Dr. Orlando Marques de Paiva, 87, São Paulo, SP 05508-270, Brazil.
| | - Douglas Segalla Caragelasco
- Department of Veterinary Internal Medicine, School of Veterinary Medicine and Animal Science, University of São Paulo, Av. Prof. Dr. Orlando Marques de Paiva, 87, São Paulo, SP 05508-270, Brazil.
| | - Ana Carolina Brandão de Campos Fonseca Pinto
- Department of Veterinary Internal Medicine, School of Veterinary Medicine and Animal Science, University of São Paulo, Av. Prof. Dr. Orlando Marques de Paiva, 87, São Paulo, SP 05508-270, Brazil.
| | - Carla Aparecida Batista Lorigados
- Department of Veterinary Internal Medicine, School of Veterinary Medicine and Animal Science, University of São Paulo, Av. Prof. Dr. Orlando Marques de Paiva, 87, São Paulo, SP 05508-270, Brazil.
| | - Lúcia Conceição Andrade
- Division of Nephrology, School of Medicine, University of São Paulo, Av. Dr. Arnaldo, 455, São Paulo, SP 01246-903, Brazil.
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Taban IM, Zhu J, DeLuca HF, Simons C. Analysis of the binding sites of vitamin D 1α-hydroxylase (CYP27B1) and vitamin D 24-hydroxylase (CYP24A1) for the design of selective CYP24A1 inhibitors: Homology modelling, molecular dynamics simulations and identification of key binding requirements. Bioorg Med Chem 2017; 25:5629-5636. [DOI: 10.1016/j.bmc.2017.08.036] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Accepted: 08/20/2017] [Indexed: 01/26/2023]
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Adult dogs are capable of regulating calcium balance, with no adverse effects on health, when fed a high-calcium diet. Br J Nutr 2017. [PMID: 28643620 DOI: 10.1017/s0007114517001210] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Although the implications of long-term high Ca intakes have been well documented in growing dogs, the health consequences of Ca excess in adult dogs remain to be established. To evaluate the impact of feeding a diet containing 7·1 g/4184 kJ (1000 kcal) Ca for 40 weeks on Ca balance and health parameters in adult dogs, eighteen neutered adult Labrador Retrievers, (nine males and nine females) aged 2·5-7·4 years were randomised to one of two customised diets for 40 weeks. The diets were manufactured according to similar nutritional specifications, with the exception of Ca and P levels. The diets provided 1·7 and 7·1 g/4184 kJ (1000 kcal) (200(SD26) and 881(SD145) mg/kg body weight0·75 per d, respectively) Ca, respectively, with a Ca:P ratio of 1·6. Clinical examinations, ultrasound scans, radiographs, health parameters, metabolic effects and mineral balance were recorded at baseline and at 8-week intervals throughout the study. Dogs in both groups were healthy throughout the trial without evidence of urinary, renal or orthopaedic disease. In addition, there were no clinically relevant changes in any of the measures made in either group (all P>0·05). The high-Ca diet resulted in a 3·3-fold increase in faecal Ca excretion (P0·05). Ca intakes of up to 7·1 g/4184 kJ (1000 kcal) are well tolerated over a period of 40 weeks, with no adverse effects that could be attributed to the diet or to a high mineral intake.
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Dittmer KE, Perera KC, Elder PA. Serum fibroblast growth factor 23 concentrations in dogs with chronic kidney disease. Res Vet Sci 2017; 114:348-350. [PMID: 28667925 DOI: 10.1016/j.rvsc.2017.06.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Revised: 06/20/2017] [Accepted: 06/22/2017] [Indexed: 11/26/2022]
Abstract
The aim of this study was to determine if serum fibroblast growth factor (FGF23) concentrations were increased in dogs with chronic kidney disease (CKD). Serum samples submitted to a commercial laboratory were collected over a 15-month period, 14 samples were from dogs with a history of polyuria/polydipsia, azotaemia and low urine specific gravity, 20 samples were from non-azotaemic dogs. Serum FGF23, parathyroid hormone, total calcium and phosphorus, urea and creatinine were measured. Mann-Whitney test was used to determine differences between non-azotaemic and CKD groups; a one-way ANOVA with Tukey pairwise comparisons was used to determine any differences between International Renal Interest Society stages; and regression models were used to determine predictors of International Renal Interest Society stage, serum phosphorus and FGF23 concentrations. The median serum FGF23 concentration of dogs with CKD was 5194.6pg/mL, which was significantly greater (P<0.001) than the median serum FGF23 concentration of non-azotaemic dogs (259.2pg/mL). Log serum FGF23 and age were significantly associated with IRIS stage (P=0.027 and P=0.032 respectively), while log serum phosphorus concentration (P<0.001) was significantly associated with log serum FGF23 concentration. In summary, serum FGF23 concentration is increased in dogs with CKD, and is associated with serum phosphorus concentration. This phosphatonin pathway may be a useful target for the development of future treatments to control plasma phosphorus concentrations in chronic kidney disease.
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Affiliation(s)
- Keren E Dittmer
- Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Private Bag 11 222, Palmerston North, New Zealand.
| | - Kalyani C Perera
- Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Private Bag 11 222, Palmerston North, New Zealand
| | - Peter A Elder
- Endolab, Canterbury Health Laboratories, Christchurch Hospital, Christchurch, New Zealand
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43
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Harjes LM, Parker VJ, Dembek K, Young GS, Giovaninni LH, Kogika MM, Chew DJ, Toribio RE. Fibroblast Growth Factor-23 Concentration in Dogs with Chronic Kidney Disease. J Vet Intern Med 2017; 31:784-790. [PMID: 28419560 PMCID: PMC5435078 DOI: 10.1111/jvim.14707] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Revised: 12/29/2016] [Accepted: 02/27/2017] [Indexed: 02/06/2023] Open
Abstract
Background Chronic kidney disease (CKD) is associated with hyperphosphatemia, decreased vitamin D metabolite concentrations, and hyperparathyroidism. This syndrome is known as CKD‐mineral bone disorder (CKD‐MBD). Recently, it has been shown that an increase in fibroblast growth factor‐23 (FGF‐23) concentration is an early biomarker of CKD in people. It is an independent risk factor for both progression of renal disease and survival time in humans and cats with CKD. Information about FGF‐23 in healthy dogs and those with CKD is lacking. Objectives To measure FGF‐23 concentration in dogs with different stages of CKD and determine its association with factors involved in CKD‐MBD, including serum phosphorus and parathyroid hormone (PTH) concentrations. A secondary aim was to validate an ELISA for measurement of plasma FGF‐23 concentration in dogs. Animals Thirty‐two client‐owned dogs with naturally occurring CKD and 10 healthy control dogs. Methods Prospective cross‐sectional study. An FGF‐23 ELISA was used to measure plasma FGF‐23 concentration in dogs and their association with serum creatinine, phosphorus, calcium, and PTH concentrations. Results Plasma FGF‐23 concentrations increased with severity of CKD and were significantly different between IRIS stages 1 and 2 versus stages 3 and 4 (P < .0001). Increases in FGF‐23 concentrations were more frequent than hyperparathyroidism or hyperphosphatemia in this cohort. Serum creatinine and phosphorus concentrations were the strongest independent predictors of FGF‐23 concentration. Conclusions and clinical importance Plasma FGF‐23 concentrations increase in dogs with CKD as disease progresses. Plasma FGF‐23 concentrations appear to be useful for further study of the pathophysiology of CKD‐MBD in dogs.
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Affiliation(s)
- L M Harjes
- Veterinary Clinical Sciences, The Ohio State University, Columbus, OH
| | - V J Parker
- Veterinary Clinical Sciences, The Ohio State University, Columbus, OH
| | - K Dembek
- Veterinary Clinical Sciences, The Ohio State University, Columbus, OH
| | - G S Young
- Center for Biostatistics, The Ohio State University, Columbus, OH
| | - L H Giovaninni
- School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, SP, Brazil
| | - M M Kogika
- School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, SP, Brazil
| | - D J Chew
- Veterinary Clinical Sciences, The Ohio State University, Columbus, OH
| | - R E Toribio
- Veterinary Clinical Sciences, The Ohio State University, Columbus, OH
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Parker VJ, Harjes LM, Dembek K, Young GS, Chew DJ, Toribio RE. Association of Vitamin D Metabolites with Parathyroid Hormone, Fibroblast Growth Factor-23, Calcium, and Phosphorus in Dogs with Various Stages of Chronic Kidney Disease. J Vet Intern Med 2017; 31:791-798. [PMID: 28186657 PMCID: PMC5435068 DOI: 10.1111/jvim.14653] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Revised: 10/28/2016] [Accepted: 12/06/2016] [Indexed: 02/03/2023] Open
Abstract
BACKGROUND Hypovitaminosis D is associated with progression of renal disease, development of renal secondary hyperparathyroidism (RHPT), chronic kidney disease-mineral bone disorder (CKD-MBD), and increased mortality in people with CKD. Despite what is known regarding vitamin D dysregulation in humans with CKD, little is known about vitamin D metabolism in dogs with CKD. OBJECTIVES The purpose of our study was to further elucidate vitamin D status in dogs with different stages of CKD and to relate it to factors that affect the development of CKD-MBD, including parathyroid hormone (PTH), fibroblast growth factor-23 (FGF-23), calcium, and phosphorus concentrations. METHODS Thirty-seven dogs with naturally occurring CKD were compared to 10 healthy dogs. Serum 25-hydroxyvitamin D [25(OH)D], 1,25-dihydroxyvitamin D [1,25(OH)2 D], and 24,25-dihydroxyvitamin D [24,25(OH)2 D], and PTH and FGF-23 concentrations were measured. Their association with serum calcium and phosphorus concentrations and IRIS stage was determined. RESULTS Compared to healthy dogs, all vitamin D metabolite concentrations were significantly lower in dogs with International Renal Interest Society (IRIS) stages 3 and 4 CKD (r [creatinine]: -0.49 to -0.60; P < .05) but not different in dogs with stages 1 and 2 CKD. All vitamin D metabolites were negatively correlated with PTH, FGF-23, and phosphorus concentrations (r: -0.39 to -0.64; P < .01). CONCLUSIONS AND CLINICAL IMPORTANCE CKD in dogs is associated with decreases in all vitamin D metabolites evaluated suggesting that multiple mechanisms, in addition to decreased renal mass, affect their metabolism. This information could have prognostic and therapeutic implications.
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Affiliation(s)
- V J Parker
- Veterinary Clinical Sciences, The Ohio State University, Columbus, OH
| | - L M Harjes
- Veterinary Clinical Sciences, The Ohio State University, Columbus, OH
| | - K Dembek
- Veterinary Clinical Sciences, The Ohio State University, Columbus, OH
| | - G S Young
- Center for Biostatistics, The Ohio State University, Columbus, OH
| | - D J Chew
- Veterinary Clinical Sciences, The Ohio State University, Columbus, OH
| | - R E Toribio
- Veterinary Clinical Sciences, The Ohio State University, Columbus, OH
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Mellanby RJ. Beyond the skeleton: the role of vitamin D in companion animal health. J Small Anim Pract 2016; 57:175-80. [PMID: 27000647 DOI: 10.1111/jsap.12458] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Revised: 12/07/2015] [Accepted: 01/28/2016] [Indexed: 12/13/2022]
Abstract
While the role of vitamin D in the maintenance of skeletal health has been well-established for many years, the discovery that many non-skeletal tissues express the vitamin D receptor stimulated renewed interest in vitamin D and its wider physiological roles. Subsequently, a vast literature has emerged over the past three decades which has linked vitamin D deficiency to the development of many human diseases including cancer, autoimmune, infectious and cardiovascular disorders. In contrast, the role vitamin D plays in the physiology of non-skeletal tissues in cats and dogs has received little attention. The situation is now starting to change with the publication of several studies that have indicated that vitamin D metabolism is deranged in numerous companion animal disorders. This article reviews the biology of vitamin D in companion animals and highlights some of the recent studies which have advanced understanding of vitamin D homeostasis in cats and dogs. Finally, the essay discusses how a "One Health" approach could further the understanding of vitamin D metabolism in mammals. Investigating vitamin D homoeostasis in companion animals offers many advantages compared to human studies in which vitamin D status is influenced by many more variables.
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Affiliation(s)
- R J Mellanby
- Royal (Dick) School of Veterinary Studies and The Roslin Institute, Division of Veterinary Clinical Studies, The University of Edinburgh, Hospital for Small Animals, Easter Bush Veterinary Centre, Roslin, Midlothian EH25 9RG
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46
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Mendoza FJ, Toribio RE, Perez-Ecija A. Nutritional secondary hyperparathyroidism in equids: Overview and new insights. EQUINE VET EDUC 2016. [DOI: 10.1111/eve.12681] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- F. J. Mendoza
- Department of Animal Medicine and Surgery; University of Cordoba; Spain
| | - R. E. Toribio
- Department of Veterinary Clinical Sciences; The Ohio State University; Columbus USA
| | - A. Perez-Ecija
- Department of Animal Medicine and Surgery; University of Cordoba; Spain
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47
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Daniels E, Sakakeeny C. Hypercalcemia: Pathophysiology, Clinical Signs, and Emergent Treatment. J Am Anim Hosp Assoc 2016; 51:291-9. [PMID: 26355578 DOI: 10.5326/jaaha-ms-6297] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Hypercalcemia is uncommonly encountered in veterinary patients. When it does occur, the effects can be severe, resulting in significant morbidity and mortality if not recognized and addressed in a timely manner. Causes of hypercalcemia are varied and include pituitary-dependent and pituitary-independent causes. A diagnosis of hypercalcemia should be made based on documentation of ionized hypercalcemia. The mainstay of emergency treatment usually involves aggressive IV fluid diuresis, the use of diuretics, and, often, glucocorticoids. The use of bisphosphonates has become increasingly more common in veterinary medicine.
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Affiliation(s)
- Erin Daniels
- From the Department of Emergency and Critical Care, Massachusetts Veterinary Referral Hospital, Woburn, MA
| | - Catherine Sakakeeny
- From the Department of Emergency and Critical Care, Massachusetts Veterinary Referral Hospital, Woburn, MA
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48
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Foster JD. Update on Mineral and Bone Disorders in Chronic Kidney Disease. Vet Clin North Am Small Anim Pract 2016; 46:1131-49. [PMID: 27436330 DOI: 10.1016/j.cvsm.2016.06.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The inappropriate phosphorus retention observed in chronic kidney disease is central to the pathophysiology of mineral and bone disorders observed in these patients. Subsequent derangements in serum fibroblast growth factor 23, parathyroid hormone, and calcitriol concentrations play contributory roles. Therapeutic intervention involves dietary phosphorus restriction and intestinal phosphate binders in order to correct phosphorus retention and maintain normocalcemia. Additional therapies may be considered to normalize serum fibroblast growth factor 23 and parathyroid hormone.
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Affiliation(s)
- Jonathan D Foster
- Department of Clinical Studies, University of Pennsylvania School of Veterinary Medicine, 3900 Delancey Street, Philadelphia, PA 19104, USA.
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49
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Sparkes AH, Caney S, Chalhoub S, Elliott J, Finch N, Gajanayake I, Langston C, Lefebvre HP, White J, Quimby J. ISFM Consensus Guidelines on the Diagnosis and Management of Feline Chronic Kidney Disease. J Feline Med Surg 2016; 18:219-39. [DOI: 10.1177/1098612x16631234] [Citation(s) in RCA: 75] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Practical relevance: Chronic kidney disease (CKD) is one of the most commonly diagnosed diseases in older cats. In most cats, CKD is also a progressive disease and can be accompanied by a wide range of clinical and clinicopathological changes. These ISFM Consensus Guidelines have been developed by an independent panel of clinicians and academics to provide practical advice on the diagnosis and management of this complex disease. Clinical challenges: Although CKD is a common clinical problem in cats, the manifestations of disease vary between individuals. Thus there is a need for careful and repeat evaluation of cats with CKD and adjustment of therapy according to individual needs. In addition to addressing problems arising from CKD and improving quality of life (QoL) for the patient, therapy may also target slowing the underlying progression of disease and hence prolonging life. While maintaining QoL is of paramount importance in our patients, this can be challenging when multiple therapies are indicated. In some cases it is necessary to prioritise therapy, given an understanding of what is likely to most benefit the individual patient. Evidence base: In preparing these Guidelines, the Panel has carefully reviewed the existing published literature, and has also graded the quality of evidence for different interventions to help to provide practical recommendations on the therapeutic options for feline CKD. This is a field of veterinary medicine that has benefited from some excellent published clinical research and further research findings will undoubtedly modify the recommendations contained in these Guidelines in the future.
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Affiliation(s)
| | | | - Serge Chalhoub
- Faculty of Veterinary Medicine, University of Calgary, Canada
| | - Jonathan Elliott
- Department of Comparative Biomedical Sciences, Royal Veterinary College, UK
| | - Natalie Finch
- Bristol Renal, School of Clinical Sciences, University of Bristol, UK
| | | | | | - Hervé P Lefebvre
- Clinical Research Unit, National Veterinary School of Toulouse (ENVT), France
| | - Joanna White
- Small Animal Specialist Hospital, Sydney, Australia
| | - Jessica Quimby
- Department of Clinical Veterinary Sciences, Colorado State University, USA
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Affiliation(s)
- Jessica A. Hokamp
- Department of Veterinary Pathobiology; College of Veterinary Medicine and Biomedical Sciences; Texas A&M University; College Station TX USA
| | - Mary B. Nabity
- Department of Veterinary Pathobiology; College of Veterinary Medicine and Biomedical Sciences; Texas A&M University; College Station TX USA
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