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Chou PH, Heng HG, Lin FJ, Chen KS. Absence of renal cortical anisotropic backscattering artifact in feline chronic kidney disease. Vet Q 2021; 41:210-216. [PMID: 34112054 PMCID: PMC8245094 DOI: 10.1080/01652176.2021.1941397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
Renal cortical anisotropy backscattering artifact (CABA) is a focal hyperechoic region where the tubules are parallel to the incident ultrasound beam, reflecting most of the beams to the transducer. To investigate the association between chronic kidney disease (CKD) and the absence of renal CABA in cats. Ultrasonographic renal images of 40 cats with CKD (stage II-IV) and 36 clinically healthy cats were blindly evaluated by two observers to determine the visibility of renal CABA. Inter- and intraobserver agreements were evaluated using McNemar's test. The association between the absence of renal CABA and CKD was assessed using Fisher's exact test. Excellent intraobserver and substantial interobserver agreements were demonstrated. A significant association (P < .0001) between absent renal CABA and CKD stage was revealed in all cats. Cats with CKD had an increased risk of the absence of renal CABA (Odds ratio, 56.0; 95% CI, 13.8-227.0) compared with the clinically healthy cats. The absence of renal CABA revealed 87.5% sensitivity and 88.9% specificity to detect CKD in all cats, and 91.7% sensitivity and 83.3% specificity in aged cats. Our study demonstrated a correlation between feline CKD and the absence of renal CABA, providing a feasible and alternative method for feline CKD evaluation.
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Affiliation(s)
- Ping-Hsien Chou
- Department of Veterinary Medicine, College of Veterinary Medicine, National Chung Hsing University, Taichung, Taiwan
| | - Hock Gan Heng
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Purdue University, West Lafayette, IN, USA
| | - Fang-Ju Lin
- Department of Veterinary Medicine, College of Veterinary Medicine, National Chung Hsing University, Taichung, Taiwan
| | - Kuan-Sheng Chen
- Department of Veterinary Medicine, College of Veterinary Medicine, National Chung Hsing University, Taichung, Taiwan.,Veterinary Medical Teaching Hospital, College of Veterinary Medicine, National Chung Hsing University, Taichung, Taiwan
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Monaghan KN, Labato MA, Papich MG. Ampicillin pharmacokinetics in azotemic and healthy dogs. J Vet Intern Med 2021; 35:987-992. [PMID: 33474795 PMCID: PMC7995374 DOI: 10.1111/jvim.16026] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2020] [Revised: 12/17/2020] [Accepted: 12/18/2020] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND Little is known about effects of factors such as kidney disease, affecting ampicillin pharmacokinetics in dogs. OBJECTIVES Determine the pharmacokinetics of ampicillin after a single intravenous dose in healthy and azotemic dogs. ANIMALS Nine dogs presenting with acute kidney injury and 10 healthy dogs. METHODS This was a prospective study. An ampicillin dose of 22.2 mg/kg (mean dose) was administered once intravenously. Blood samples were obtained at timed intervals (just before administration, 1, 2, 4, 12, and 24 hours), analyzed using high-pressure liquid chromatography followed by pharmacokinetic analysis of the plasma drug concentrations. RESULTS Peak ampicillin concentration (mcg/mL; 97.07 (36.1) vs 21.3 (50.26)), P<.001 (geometric mean (coefficient of variation, CV%)), half-life (hours; 5.86 (56.55) vs 0.97 (115.3)), P<.001) and AUC (h × mcg/mL; 731.04 (83.75) vs 33.57 (53.68)), P<.001) were greater in azotemic dogs than in healthy dogs. Azotemic dogs also had significantly lower clearance (30.06 (84.19) vs 655.03 (53.67); mL/kg h, P < .001) and volume of distribution (253.95 (30.14) vs 916.93 (135.24); mL/kg, P <.001) compared to healthy dogs. CONCLUSION AND CLINICAL IMPORTANCE Increased drug concentrations and slower clearance of ampicillin in azotemic dogs could have clinical importance in contributing to antibiotic associated morbidity requiring indicating the need to adjust ampicillin dosing in dogs with decreased kidney function.
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Affiliation(s)
- Kelly N. Monaghan
- Cummings School of Veterinary MedicineTufts University, Veterinary Clinical ScienceNorth GraftonMassachusettsUSA
- Present address: Kelly N. Monaghan, Aspen Meadow Veterinary Specialists, 104 South Main StreetLongmontCOUSA
| | - Mary Anna Labato
- Cummings School of Veterinary MedicineTufts University, Veterinary Clinical ScienceNorth GraftonMassachusettsUSA
| | - Mark G. Papich
- Department of Molecular Biomedical SciencesNorth Carolina State University, College of Veterinary MedicineRaleighNorth CarolinaUSA
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Coyne M, Szlosek D, Clements C, McCrann D, Olavessen L. Association between breed and renal biomarkers of glomerular filtration rate in dogs. Vet Rec 2020; 187:e82. [PMID: 32611706 PMCID: PMC7799420 DOI: 10.1136/vr.105733] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Revised: 05/07/2020] [Accepted: 05/28/2020] [Indexed: 12/17/2022]
Abstract
Background Kidney disease, especially chronic kidney disease (CKD), is common in older dogs. The biomarkers symmetric dimethylarginine (SDMA) and creatinine (Cr) are indicators of glomerular filtration rate (GFR). This retrospective study used these biomarkers to identify groups at risk of decreased GFR at the breed level. Methods Data from dogs with a single serum chemistry result that included Cr and SDMA submitted between July 2015 through December 2017 were included. Dogs were identified by breed and age group. Decreased GFR was defined as Cr above 1.9 mg/dl or SDMA above 18 µg/dl. Results Fourteen breeds had a significantly higher percentage of dogs with increased SDMA or Cr for one or more age groups. Geriatric and senior Shetland sheepdogs, Yorkshire terriers and Pomeranians were significantly more likely to have increased renal biomarkers. Boxers were identified with significantly increased renal biomarkers in the age groups spanning two months to 10 years of age. Conclusion Evidence of decreased GFR occurred commonly in older dogs of most breeds, especially geriatric dogs greater than 10 years of age, but there were some exceptions, with more significant changes affecting younger animals of several breeds. The combination of SDMA and Cr identified more cases of decreased GFR than either SDMA or Cr alone.
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Affiliation(s)
| | | | | | | | - Lauren Olavessen
- IDEXX Laboratories, Westbrook, Maine, USA.,PetIQ, Eagle, Idaho, United States
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Li Z, Litchfield J, Tess DA, Carlo AA, Eng H, Keefer C, Maurer TS. A Physiologically Based in Silico Tool to Assess the Risk of Drug-Related Crystalluria. J Med Chem 2020; 63:6489-6498. [PMID: 32130005 DOI: 10.1021/acs.jmedchem.9b01995] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Drug precipitation in the nephrons of the kidney can cause drug-induced crystal nephropathy (DICN). To aid mitigation of this risk in early drug discovery, we developed a physiologically based in silico model to predict DICN in rats, dogs, and humans. At a minimum, the likelihood of DICN is determined by the level of systemic exposure to the molecule, the molecule's physicochemical properties and the unique physiology of the kidney. Accordingly, the proposed model accounts for these properties in order to predict drug exposure relative to solubility along the nephron. Key physiological parameters of the kidney were codified in a manner consistent with previous reports. Quantitative structure-activity relationship models and in vitro assays were used to estimate drug-specific physicochemical inputs to the model. The proposed model was calibrated against urinary excretion data for 42 drugs, and the utility for DICN prediction is demonstrated through application to 20 additional drugs.
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Affiliation(s)
- Zhenhong Li
- Pfizer Worldwide Research, Development and Medical, Medicine Design, Cambridge, Massachusetts 02139, United States
| | - John Litchfield
- Pfizer Worldwide Research, Development and Medical, Medicine Design, Cambridge, Massachusetts 02139, United States
| | - David A Tess
- Pfizer Worldwide Research, Development and Medical, Medicine Design, Cambridge, Massachusetts 02139, United States
| | - Anthony A Carlo
- Pfizer Worldwide Research, Development and Medical, Medicine Design, Groton, Connecticut 06340, United States
| | - Heather Eng
- Pfizer Worldwide Research, Development and Medical, Medicine Design, Groton, Connecticut 06340, United States
| | - Christopher Keefer
- Pfizer Worldwide Research, Development and Medical, Medicine Design, Groton, Connecticut 06340, United States
| | - Tristan S Maurer
- Pfizer Worldwide Research, Development and Medical, Medicine Design, Cambridge, Massachusetts 02139, United States
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Polichnowski AJ. Microvascular rarefaction and hypertension in the impaired recovery and progression of kidney disease following AKI in preexisting CKD states. Am J Physiol Renal Physiol 2018; 315:F1513-F1518. [PMID: 30256130 DOI: 10.1152/ajprenal.00419.2018] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Acute kidney injury (AKI) is a major complication in hospitalized patients and is associated with elevated mortality rates. Numerous recent studies indicate that AKI also significantly increases the risk of chronic kidney disease (CKD), end-stage renal disease (ESRD), hypertension, cardiovascular disease, and mortality in those patients who survive AKI. Moreover, the risk of ESRD and mortality after AKI is substantially higher in patients with preexisting CKD. However, the underlying mechanisms by which AKI and CKD interact to promote ESRD remain poorly understood. The recently developed models that superimpose AKI on rodents with preexisting CKD have provided new insights into the pathogenic mechanisms mediating the deleterious interactions between AKI and CKD. These studies show that preexisting CKD impairs recovery from AKI and promotes the development of mechanisms of CKD progression. Specifically, preexisting CKD exacerbates microvascular rarefaction, failed tubular redifferentiation, disruption of cell cycle regulation, hypertension, and proteinuria after AKI. The purpose of this review is to discuss the potential mechanisms by which microvascular rarefaction and hypertension contribute to impaired recovery from AKI and the subsequent progression of renal disease in preexisting CKD states.
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Affiliation(s)
- Aaron J Polichnowski
- Department of Biomedical Sciences, Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee.,Center of Excellence in Inflammation, Infectious Disease and Immunity, Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee
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Nabity MB, Lees GE, Boggess MM, Yerramilli M, Obare E, Yerramilli M, Rakitin A, Aguiar J, Relford R. Symmetric Dimethylarginine Assay Validation, Stability, and Evaluation as a Marker for the Early Detection of Chronic Kidney Disease in Dogs. J Vet Intern Med 2015; 29:1036-44. [PMID: 26079532 PMCID: PMC4895368 DOI: 10.1111/jvim.12835] [Citation(s) in RCA: 134] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2015] [Revised: 03/23/2015] [Accepted: 04/23/2015] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Symmetric dimethylarginine (SDMA) is a small molecule formed by methylation of arginine, and released into blood during protein degradation. SDMA is primarily eliminated by renal excretion and is a promising endogenous marker of glomerular filtration rate (GFR). OBJECTIVES To validate an assay for SDMA measurement, determine stability of SDMA in blood, and compare SDMA with serum creatinine concentration (sCr) and GFR for early detection of decreasing kidney function in dogs with chronic kidney disease (CKD). ANIMALS Eight male dogs affected with X-linked hereditary nephropathy and 4 unaffected male littermates. METHODS Prospective study validating SDMA measurement using liquid chromatography-mass spectrometry, assessing stability of SDMA in serum and plasma, and serially determining sCr, SDMA, and GFR (using iohexol clearance) in dogs during progression from preclinical disease to end-stage renal failure. Correlations were determined using linear regression. Timepoints at which sCr, SDMA, and GFR identified decreased renal function were compared using defined cutoffs, trending in an individual dog, and comparison with unaffected littermates. RESULTS Symmetric dimethylarginine was highly stable in serum and plasma, and the assay demonstrated excellent analytical performance. In unaffected dogs, SDMA remained unchanged whereas in affected dogs, SDMA increased during disease progression, correlating strongly with an increase in sCr (r = 0.95) and decrease in GFR (r = -0.95). Although trending improved sCr's sensitivity, SDMA identified, on average, <20% decrease in GFR, which was earlier than sCr using any comparison method. CONCLUSIONS AND CLINICAL IMPORTANCE Symmetric dimethylarginine is useful for both early identification and monitoring of decreased renal function in dogs with CKD.
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Affiliation(s)
- M B Nabity
- Department of Veterinary Pathobiology, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, TX
| | - G E Lees
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, TX
| | - M M Boggess
- School of Mathematical and Statistical Sciences, Arizona State University, Tempe, AZ
| | | | - E Obare
- IDEXX Laboratories Inc., Westbrook, ME
| | | | - A Rakitin
- IDEXX Laboratories Inc., Westbrook, ME
| | - J Aguiar
- IDEXX Laboratories Inc., Westbrook, ME
| | - R Relford
- IDEXX Laboratories Inc., Westbrook, ME
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Abstract
Intrarenal autoregulatory mechanisms maintain renal blood flow (RBF) and glomerular filtration rate (GFR) independent of renal perfusion pressure (RPP) over a defined range (80-180 mmHg). Such autoregulation is mediated largely by the myogenic and the macula densa-tubuloglomerular feedback (MD-TGF) responses that regulate preglomerular vasomotor tone primarily of the afferent arteriole. Differences in response times allow separation of these mechanisms in the time and frequency domains. Mechanotransduction initiating the myogenic response requires a sensing mechanism activated by stretch of vascular smooth muscle cells (VSMCs) and coupled to intracellular signaling pathways eliciting plasma membrane depolarization and a rise in cytosolic free calcium concentration ([Ca(2+)]i). Proposed mechanosensors include epithelial sodium channels (ENaC), integrins, and/or transient receptor potential (TRP) channels. Increased [Ca(2+)]i occurs predominantly by Ca(2+) influx through L-type voltage-operated Ca(2+) channels (VOCC). Increased [Ca(2+)]i activates inositol trisphosphate receptors (IP3R) and ryanodine receptors (RyR) to mobilize Ca(2+) from sarcoplasmic reticular stores. Myogenic vasoconstriction is sustained by increased Ca(2+) sensitivity, mediated by protein kinase C and Rho/Rho-kinase that favors a positive balance between myosin light-chain kinase and phosphatase. Increased RPP activates MD-TGF by transducing a signal of epithelial MD salt reabsorption to adjust afferent arteriolar vasoconstriction. A combination of vascular and tubular mechanisms, novel to the kidney, provides for high autoregulatory efficiency that maintains RBF and GFR, stabilizes sodium excretion, and buffers transmission of RPP to sensitive glomerular capillaries, thereby protecting against hypertensive barotrauma. A unique aspect of the myogenic response in the renal vasculature is modulation of its strength and speed by the MD-TGF and by a connecting tubule glomerular feedback (CT-GF) mechanism. Reactive oxygen species and nitric oxide are modulators of myogenic and MD-TGF mechanisms. Attenuated renal autoregulation contributes to renal damage in many, but not all, models of renal, diabetic, and hypertensive diseases. This review provides a summary of our current knowledge regarding underlying mechanisms enabling renal autoregulation in health and disease and methods used for its study.
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Affiliation(s)
- Mattias Carlström
- Department of Medicine, Division of Nephrology and Hypertension and Hypertension, Kidney and Vascular Research Center, Georgetown University, Washington, District of Columbia; Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden; and Department of Cell Biology and Physiology, UNC Kidney Center, and McAllister Heart Institute, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Christopher S Wilcox
- Department of Medicine, Division of Nephrology and Hypertension and Hypertension, Kidney and Vascular Research Center, Georgetown University, Washington, District of Columbia; Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden; and Department of Cell Biology and Physiology, UNC Kidney Center, and McAllister Heart Institute, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - William J Arendshorst
- Department of Medicine, Division of Nephrology and Hypertension and Hypertension, Kidney and Vascular Research Center, Georgetown University, Washington, District of Columbia; Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden; and Department of Cell Biology and Physiology, UNC Kidney Center, and McAllister Heart Institute, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
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Mishina M, Watanabe T. Development of hypertension and effects of benazepril hydrochloride in a canine remnant kidney model of chronic renal failure. J Vet Med Sci 2008; 70:455-60. [PMID: 18525166 DOI: 10.1292/jvms.70.455] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
In order to determine whether hypertension would develop in dogs with chronic renal failure, we performed 7/8 renal ablation in 6 healthy dogs and compared pre- and post-ablation blood pressures determined by telemetry. One month after the renal ablation, blood urea nitrogen and creatinine were significantly increased (p<0.05), creatinine clearance was decreased (p<0.05), and blood pressure was increased significantly (p<0.05). Simultaneously, plasma renin activity, angiotensin I and II, and aldosterone were elevated significantly (p<0.05) compared with the values obtained from 11 healthy dogs with intact renal function. The dogs with induced renal failure and hypertension were administered an angiotensin-converting enzyme inhibitor, benazepril hydrochloride, once daily for 2 weeks at 2 mg/kg body weight, and changes in blood pressure and the renin-angiotensin-aldosterone (RAA) system were determined. During the administration of benazepril hydrochloride, blood pressure, angiotensin II and aldosterone decreased significantly (p<0.05) and, upon discontinuation of administration, increased to the pre-administration levels (p<0.05). Plasma renin activity and angiotensin I showed no significant changes throughout the administration study. These results provide experimental evidence that hypertension develops in dogs with chronic renal failure through mechanisms involving the RAA system and demonstrate that benazepril hydrochloride improves renal hypertension in dogs.
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Affiliation(s)
- Mika Mishina
- Department of Nephrology and Urology, Teaching Animal Hospital, Azabu University, Sagamihara, Kanagawa, Japan.
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WATANABE T, MISHINA M. Effects of Benazepril Hydrochloride in Cats with Experimentally Induced or Spontaneously Occurring Chronic Renal Failure. J Vet Med Sci 2007; 69:1015-23. [DOI: 10.1292/jvms.69.1015] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
- Toshifumi WATANABE
- Department of Surgery, School of Veterinary Medicine, Azabu University
- Department of Nephrology and Urology, Teaching Animal Hospital, Azabu University
| | - Mika MISHINA
- Department of Nephrology and Urology, Teaching Animal Hospital, Azabu University
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Brown SA. Functional foods and the urinary tract. Vet Clin North Am Small Anim Pract 2004; 34:173-85, vi-vii. [PMID: 15032127 DOI: 10.1016/j.cvsm.2003.09.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
There is no universally accepted definition of a commonly used term for a functional food: nutraceutical. For the purposes of this article, a nutraceutical is any ingredient found in foods that has a demonstrated (or proposed) physiologic benefit. Although a nutraceutical is generally taken to be an ingredient that can be isolated or purified from food, plants, or marine products and made available in medicinal form, this article also considers claims of benefit to the urinary tract for foods or food supplements in which the active ingredient has not yet been characterized or isolated.
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Affiliation(s)
- Scott A Brown
- Department of Physiology and Pharmacology, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, USA.
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