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Dos Santos RC, Estrela-Lima A, Conrado-Dos-Santos WL, Oriá A, de Sousa Gonçalves R, Silva DN, Larangeira DF, do Socorro Pires E Cruz M, de Pinho FA, Barrouin-Melo SM. A compared histopathological study on kidneys and eye bulbs in distinct clinical presentations of canine leishmaniasis by Leishmania infantum. Vet Res Commun 2024; 48:2243-2261. [PMID: 38717733 DOI: 10.1007/s11259-024-10379-z] [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: 08/31/2023] [Accepted: 04/13/2024] [Indexed: 08/10/2024]
Abstract
Canine leishmaniasis (CanL) caused by Leishmania infantum commonly progresses with renal and ophthalmic lesions associated with active systemic disease. As chronic inflammation related to immune complex deposits is a pathophysiological factor in the development of both glomerulonephritis and uveitis, we aimed to evaluate renal and ocular histopathological lesions and analyze whether they were related to each other and the clinical degree of the disease. For that, we evaluated 15 dogs from CanL-endemic areas. L. infantum PCR-positive dogs were studied according to disease severity into two different groups: Group-1 (G1) had data from seven dogs with mild to moderate CanL and no history of treatment, and G2 was formed with eight dogs with severe to terminal disease that had not responded to CanL treatment. Histopathological analysis of kidneys showed higher frequencies and intensities of glomerular basement membrane thickening (p = 0.026), deposits in glomeruli (p = 0.016), epithelial necrosis (p = 0.020), tubular dilatation (p = 0.003) and interstitial fibrosis (p = 0.04) in G2 dogs than in G1 dogs. Surprisingly, the histopathology of eye bulbs showed a higher frequency and intensity of retinitis (p = 0.019) in G1 dogs than in G2 dogs. The comparative analysis showed that there was no correspondence between histopathological findings in kidneys versus eyes in milder or more severe CanL. Our findings suggested that (1) clinically undetectable eye alterations can be more precocious than those in kidneys in the development of CanL, and (2) the lower frequency of eye lesions and higher frequency of renal lesions in dogs with terminal disease even after treatment indicate that therapy may have been effective in reducing CanL-associated ophthalmic disease but not proportionally in reducing kidney disease.
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Affiliation(s)
- Roseclea Chagas Dos Santos
- Teaching Hospital of Veterinary Medicine (HOSPMEV) of the Federal University of Bahia (UFBA), Salvador, BA, Brazil
| | - Alessandra Estrela-Lima
- Teaching Hospital of Veterinary Medicine (HOSPMEV) of the Federal University of Bahia (UFBA), Salvador, BA, Brazil.
- Department of Veterinary Anatomy, Pathology, and Clinics, School of Veterinary Medicine and Zootechny, UFBA, Salvador, BA, Brazil.
- Laboratory of Veterinary Pathology, HOSPMEV, UFBA, Salvador, BA, Brazil.
- Escola de Medicina Veterinária E Zootecnia, Universidade Federal da Bahia, Av. Milton Santos, 500, Salvador, Bahia, Brasil, CEP 40170-110.
| | | | - Arianne Oriá
- Teaching Hospital of Veterinary Medicine (HOSPMEV) of the Federal University of Bahia (UFBA), Salvador, BA, Brazil
- Department of Veterinary Anatomy, Pathology, and Clinics, School of Veterinary Medicine and Zootechny, UFBA, Salvador, BA, Brazil
| | - Rafaela de Sousa Gonçalves
- Teaching Hospital of Veterinary Medicine (HOSPMEV) of the Federal University of Bahia (UFBA), Salvador, BA, Brazil
| | - Danielle Nascimento Silva
- Teaching Hospital of Veterinary Medicine (HOSPMEV) of the Federal University of Bahia (UFBA), Salvador, BA, Brazil
| | - Daniela Farias Larangeira
- Teaching Hospital of Veterinary Medicine (HOSPMEV) of the Federal University of Bahia (UFBA), Salvador, BA, Brazil
- Department of Veterinary Anatomy, Pathology, and Clinics, School of Veterinary Medicine and Zootechny, UFBA, Salvador, BA, Brazil
- Laboratory of Veterinary Infectiology - Zoonotic Leishmaniasis Clinic, HOSPMEV, UFBA, Salvador, BA, Brazil
| | - Maria do Socorro Pires E Cruz
- Laboratory of Animal Health, Center of Agrarian Sciences, Federal University of Piauí (UFPI), University Campus Minister Petrônio Portella, Teresina-PI, Brazil
| | - Flaviane Alves de Pinho
- Teaching Hospital of Veterinary Medicine (HOSPMEV) of the Federal University of Bahia (UFBA), Salvador, BA, Brazil
- Department of Veterinary Anatomy, Pathology, and Clinics, School of Veterinary Medicine and Zootechny, UFBA, Salvador, BA, Brazil
- Laboratory of Veterinary Infectiology - Zoonotic Leishmaniasis Clinic, HOSPMEV, UFBA, Salvador, BA, Brazil
| | - Stella Maria Barrouin-Melo
- Teaching Hospital of Veterinary Medicine (HOSPMEV) of the Federal University of Bahia (UFBA), Salvador, BA, Brazil.
- Department of Veterinary Anatomy, Pathology, and Clinics, School of Veterinary Medicine and Zootechny, UFBA, Salvador, BA, Brazil.
- Laboratory of Veterinary Infectiology - Zoonotic Leishmaniasis Clinic, HOSPMEV, UFBA, Salvador, BA, Brazil.
- Escola de Medicina Veterinária E Zootecnia, Universidade Federal da Bahia, Av. Milton Santos, 500, Salvador, Bahia, Brasil, CEP 40170-110.
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Paukner K, Filipejova Z, Mareš J, Vávra M, Rehakova K, Proks P, Gabriel V, Crha M. A comprehensive analysis of albuminuria in canine chronic kidney disease. Vet Med Sci 2024; 10:e1403. [PMID: 38419297 PMCID: PMC10902581 DOI: 10.1002/vms3.1403] [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: 08/03/2023] [Revised: 01/29/2024] [Accepted: 02/09/2024] [Indexed: 03/02/2024] Open
Abstract
BACKGROUND Albuminuria, an important marker of decreased kidney function in chronic kidney disease (CKD), is not routinely used for CKD detection or proteinuria appearance. Its relationships with biochemical parameters and blood pressure in dogs are poorly understood. OBJECTIVES This study aimed to evaluate the relationship of albuminuria with various CKD markers, its correlation with the urinary protein to creatinine ratio (UPC), and hypertension in dogs with early stages of CKD. It also sought to determine the usability of the urinary albumin to creatinine ratio (UAC) for CKD screening. METHODS The study reviewed records of 102 dogs, categorising them into four groups based on disease status. UAC and UPC ratio, biochemistry and haematology variables, age, and systolic blood pressure were determined. RESULTS The Pearson's correlation coefficient between log-transformed values of UPC and UAC was r = 0.902 (95% CI: 0.87 to 0.93). Median UAC ratio values were 2.1 mg/g for the Healthy control group (n = 17), 54.2 mg/g for early stages CKD (n = 42), 5.8 mg/g for Acute sick control (n = 30), and 104 mg/g for Chronic sick control (n = 13). Thresholding UAC ratio as an indicator for impaired kidney function with the threshold of 10 mg/g (established based on the receiver operating characteristic curve) had a sensitivity 81.8%, specificity of 89.4%, positive predictive value (PPV) 90%, and negative predictive value (NPV) 80.1%. The correlation of UAC with biochemistry and haematology variables was statistically significant; for SDMA (μg/L), it was r = 0.566 and for other variables, it was weak to moderate. UAC was markedly elevated in cases of severe hypertension. CONCLUSIONS UAC ratio was significantly different among dogs with impaired and not impaired kidney function. The correlation strength for the UAC and UPC ratios was high. UAC ratio may be a promising marker for proteinuria analysis in dogs with CKD or other kidney function alterations.
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Affiliation(s)
- Karel Paukner
- Small Animal ClinicUniversity of Veterinary Sciences BrnoBrnoCzech Republic
- Center for Experimental MedicineInstitute for Clinical and Experimental MedicinePragueCzech Republic
| | - Zita Filipejova
- Small Animal ClinicUniversity of Veterinary Sciences BrnoBrnoCzech Republic
| | - Jan Mareš
- Department of Data ScienceInstitute for Clinical and Experimental MedicinePragueCzech Republic
| | - Miloš Vávra
- Small Animal ClinicUniversity of Veterinary Sciences BrnoBrnoCzech Republic
| | - Kristina Rehakova
- Small Animal Clinical LaboratoryUniversity of Veterinary Sciences BrnoBrnoCzech Republic
| | - Pavel Proks
- Small Animal ClinicUniversity of Veterinary Sciences BrnoBrnoCzech Republic
| | - Vojtech Gabriel
- Department of Biomedical SciencesCollege of Veterinary Medicine, Iowa State UniversityAmesIowaUSA
| | - Michal Crha
- Small Animal ClinicUniversity of Veterinary Sciences BrnoBrnoCzech Republic
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YABUKI A, ANDO T, TANABE M, KURAHARA N, YAMATO O. Severe glomerular fibrin thrombosis in a dog. J Vet Med Sci 2024; 86:87-91. [PMID: 38057079 PMCID: PMC10849864 DOI: 10.1292/jvms.23-0388] [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: 09/13/2023] [Accepted: 11/21/2023] [Indexed: 12/08/2023] Open
Abstract
Here, we present a case of severe glomerular fibrin thrombosis in a dog with lymphoma. A 3-year-old neutered male Chihuahua presented with acute kidney injury, hypoalbuminemia, and transudate ascites. The dog showed symmetric enlargement of the spleen, which was diagnosed as B-cell lymphoma based on cytology and polymerase chain reaction tests. The dog died after intensive care, and the kidneys were removed for histopathological examination. Light microscopy, immunofluorescence, and electron microscopy analyses were performed for renal pathology; however, the findings did not support the evidence of protein-losing nephropathy. Instead, the endocapillary accumulation of fibrin thrombi was prominent in most glomeruli. A diagnosis of severe glomerular fibrin thrombosis was established, and hypoalbuminemia was considered the underlying cause of kidney damage.
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Affiliation(s)
- Akira YABUKI
- Veterinary Clinical Pathology, Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima, Japan
| | | | - Mika TANABE
- Veterinary Pathology Diagnostic Center, Fukuoka, Japan
| | - Natsume KURAHARA
- Veterinary Clinical Pathology, Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima, Japan
| | - Osamu YAMATO
- Veterinary Clinical Pathology, Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima, Japan
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Cherry AD, Chu CP, Cianciolo RE, Hokamp JA, Jacobson SA, Nabity MB. MicroRNA-126 in dogs with immune complex-mediated glomerulonephritis. J Vet Intern Med 2024; 38:216-227. [PMID: 38116844 PMCID: PMC10800198 DOI: 10.1111/jvim.16932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Accepted: 10/26/2023] [Indexed: 12/21/2023] Open
Abstract
BACKGROUND Most proteinuric dogs with naturally occurring chronic kidney disease have amyloidosis (AMYL), glomerulosclerosis (GS), or immune complex-mediated glomerulonephritis (ICGN), each with different treatment and prognosis. A noninvasive and disease-specific biomarker is lacking. HYPOTHESIS We hypothesized that the expression pattern of biofluid microRNA (miRNAs and miRs) would correlate with disease progression and categorization. ANIMALS Archived serum and urine samples from 18 dogs with glomerular disease and 6 clinically healthy dogs; archived urine samples from 49 dogs with glomerular disease and 13 clinically healthy dogs. METHODS Retrospective study. Archived biofluid samples from adult dogs with biopsy-confirmed glomerular disease submitted to the International Veterinary Renal Pathology Service between 2008 and 2016 were selected. Serum and urinary miRNAs were isolated and profiled using RNA sequencing. Urinary miR-126, miR-21, miR-182, and miR-486 were quantified using quantitative reverse transcription PCR. RESULTS When comparing more advanced disease with earlier disease, no serum miRNAs were differentially expressed, but urinary miR-21 and miR-182 were 1.63 (95% CI: .86-3.1) and 1.45 (95% CI: .82-2.6) times higher in azotemic dogs, respectively (adjusted P < .05) and weakly correlated with tubulointerstitial fibrosis (miR-21: r = .32, P = .03; miR-182: r = .28, P = .05). Expression of urinary miR-126 was 10.5 (95% CI: 4.1-26.7), 28.9 (95% CI: 10.5-79.8), and 126.2 (95% CI: 44.7-356.3) times higher in dogs with ICGN compared with dogs with GS, AMYL, and healthy controls, respectively (P < .001). CONCLUSIONS AND CLINICAL IMPORTANCE The miR-126 could help identify dogs that might benefit from immunosuppressive therapy in the absence of a biopsy. MiR-21 and miR-182 are potential markers of disease severity and fibrosis.
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Affiliation(s)
- Ariana D. Cherry
- Department of Veterinary Pathobiology, School of Veterinary Medicine & Biomedical SciencesTexas A&M UniversityCollege StationTexasUSA
| | - Candice P. Chu
- Department of Veterinary Pathobiology, School of Veterinary Medicine & Biomedical SciencesTexas A&M UniversityCollege StationTexasUSA
| | - Rachel E. Cianciolo
- Department of Veterinary Biosciences, College of Veterinary MedicineThe Ohio State UniversityColumbusOhioUSA
- Present address:
Niche Diagnostics, LLCColumbusOhioUSA
- Present address:
Zoetis Inc.ColumbusOhioUSA
| | - Jessica A. Hokamp
- Department of Veterinary Pathobiology, School of Veterinary Medicine & Biomedical SciencesTexas A&M UniversityCollege StationTexasUSA
| | - Sarah A. Jacobson
- Department of Veterinary Pathobiology, School of Veterinary Medicine & Biomedical SciencesTexas A&M UniversityCollege StationTexasUSA
| | - Mary B. Nabity
- Department of Veterinary Pathobiology, School of Veterinary Medicine & Biomedical SciencesTexas A&M UniversityCollege StationTexasUSA
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Foster JD. Nephrology in Veterinary Medicine. KIDNEY360 2023; 4:1641-1649. [PMID: 37840194 PMCID: PMC10695652 DOI: 10.34067/kid.0000000000000273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Accepted: 10/09/2023] [Indexed: 10/17/2023]
Abstract
Veterinary nephrology is a specialized field of veterinary medicine providing a high level of care for animals with all types of kidney disease. Veterinarians complete extensive training to become board-certified in veterinary nephrology-urology. Companion animal nephrology is the most advanced field; however, all species are afflicted by a variety of renal disorders. Most naturally occurring animal kidney diseases have similar disorders found in people; where veterinary research is lacking, clinical management is often modified from standard of care in people. Veterinarians have become adept at scaling down procedures to safely perform them on dogs and cats weighing only a few kilograms. Advanced diagnostics (renal biopsy, cystoscopy, fluoroscopic studies, etc. ) and therapeutics (renal replacement therapy, interventional endourology, etc. ) are commonly performed within the practice of veterinary nephrology-urology. Collaboration between veterinary and human nephrologists may advance both disciplines and improve care for people and animals alike.
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Amerman HK, Cianciolo RE, Casal ML, Mauldin E. German Shorthaired Pointer dogs with exfoliative cutaneous lupus erythematosus develop immune-complex membranous glomerulonephropathy. Vet Pathol 2023; 60:843-848. [PMID: 37222157 PMCID: PMC10583476 DOI: 10.1177/03009858231173362] [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] [Indexed: 05/25/2023]
Abstract
German Shorthaired Pointer (GSHP) dogs with a UNC93B1 gene mutation develop exfoliative cutaneous lupus erythematosus (ECLE) and kidney disease resembling lupus nephritis in humans. The objective of this study was to characterize the kidney disease by light microscopy, immunofluorescence, and electron microscopy in a population of GSHP dogs with ECLE. Medical records were reviewed, and light microscopy of kidneys from 7 GSHP dogs with a previous histologic diagnosis of ECLE was performed. Immunofluorescence of fresh-frozen kidney from 1 dog and transmission electron microscopy of kidney from that dog and 2 additional dogs were performed. Five of 7 dogs had proteinuria diagnosed by urinalysis or urine protein-to-creatinine ratio. Two of 7 dogs were intermittently hypoalbuminemic, and none were azotemic. Histologic findings included early (2 dogs) to late (5 dogs) membranous glomerulonephropathy characterized by mild-to-severe glomerular capillary loop thickening and tubular proteinosis. In all 7 cases, trichrome staining revealed red granular immune deposits on the subepithelial surface of the glomerular basement membrane. Immunofluorescence revealed strong granular labeling for immunoglobulins and complement protein C3. Electron microscopy demonstrated subepithelial electron-dense immune deposits encircled by the remodeled glomerular basement membrane. These findings are diagnostic of immune-complex membranous glomerulonephropathy and are similar to class V lupus in humans. This cohort of GSHP dogs with ECLE developed immune-complex membranous glomerulonephropathy, which we hypothesize is a manifestation of systemic lupus erythematosus. GSHP dogs with ECLE should undergo clinical evaluation of renal function for early identification and treatment.
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Quimby JM, McLeland SM, Cianciolo RE, Lunn KF, Lulich JP, Erikson A, Barron LB. Frequency of histologic lesions in the kidneys of cats without kidney disease. J Feline Med Surg 2022; 24:e472-e480. [PMID: 36475921 PMCID: PMC10812332 DOI: 10.1177/1098612x221123768] [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] [Accepted: 08/12/2022] [Indexed: 12/13/2022]
Abstract
OBJECTIVES In humans, renal aging is associated with an increased frequency of glomerulosclerosis, interstitial fibrosis, inflammation and tubular atrophy. The purpose of this study was to describe the frequency of renal histopathologic lesions in cats without kidney disease. METHODS A cross-sectional study of archival kidney tissue from 74 cats without kidney disease (serum creatinine <1.6 mg/dl; urine specific gravity >1.035) was carried out: 0-4 years (young, n = 18); 5-9 years (mature, n = 16); 10-14 years (senior, n = 34), 15+ years (geriatric, n = 6). Glomerulosclerosis, tubular atrophy, interstitial inflammation and fibrosis, and the presence or absence of lipid in the interstitium and tubules were scored by a pathologist masked to clinical data. Statistical analyses were performed as appropriate. RESULTS Geriatric cats had significantly more glomerulosclerosis than mature (P = 0.01) and young cats (P = 0.004). Senior cats had significantly more glomerulosclerosis than young cats (P = 0.006). Glomerulosclerosis was weakly positively correlated with age (r = 0.48; P <0.0001). Geriatric cats had significantly more tubular atrophy than mature (P = 0.02) and young cats (P <0.0001). Senior cats had significantly more tubular atrophy than young cats (P <0.0001). Geriatric cats had significantly more inflammation than senior cats (P = 0.02), mature cats (P = 0.01) and young cats (P <0.0001). Senior cats had significantly more inflammation than young cats (P = 0.004). Geriatric and senior cats had significantly more fibrosis than young cats (P = 0.01 and P = 0.04, respectively). Frequency of tubular lipid increased with age (young: 28%; mature: 56%; senior: 79%; geriatric: 100%) as did the frequency of interstitial lipid (young: 22%, mature: 56%, senior: 85%, geriatric: 100%). CONCLUSIONS AND RELEVANCE Evidence of renal aging exists in cats. These changes imply that the aging kidney may be more susceptible to injury and impaired healing.
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Affiliation(s)
- Jessica M Quimby
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH, USA
| | - Shannon M McLeland
- International Veterinary Renal Pathology Service, Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH, USA
| | - Rachel E Cianciolo
- International Veterinary Renal Pathology Service, Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH, USA
| | - Katharine F Lunn
- Department of Clinical Sciences, North Carolina State University, Raleigh, NC, USA
| | - Jody P Lulich
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, University of Minnesota, MN, USA
| | - Andrea Erikson
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH, USA
| | - Lara B Barron
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, University of Minnesota, MN, USA
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An early prediction model for canine chronic kidney disease based on routine clinical laboratory tests. Sci Rep 2022; 12:14489. [PMID: 36008537 PMCID: PMC9411602 DOI: 10.1038/s41598-022-18793-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 08/19/2022] [Indexed: 11/08/2022] Open
Abstract
The aim of this study was to derive a model to predict the risk of dogs developing chronic kidney disease (CKD) using data from electronic health records (EHR) collected during routine veterinary practice. Data from 57,402 dogs were included in the study. Two thirds of the EHRs were used to build the model, which included feature selection and identification of the optimal neural network type and architecture. The remaining unseen EHRs were used to evaluate model performance. The final model was a recurrent neural network with 6 features (creatinine, blood urea nitrogen, urine specific gravity, urine protein, weight, age). Identifying CKD at the time of diagnosis, the model displayed a sensitivity of 91.4% and a specificity of 97.2%. When predicting future risk of CKD, model sensitivity was 68.8% at 1 year, and 44.8% 2 years before diagnosis. Positive predictive value (PPV) varied between 15 and 23% and was influenced by the age of the patient, while the negative predictive value remained above 99% under all tested conditions. While the modest PPV limits its use as a stand-alone diagnostic screening tool, high specificity and NPV make the model particularly effective at identifying patients that will not go on to develop CKD.
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Alves AF, Pereira RDA, Rodrigues MA, Campos LS, do Carmo DD, de Abreu Teles PP, Andrade HM, de Araújo SA, Gomes DA, Tafuri WL. Leishmania (L.) infantum BH401 strain induces classic renal lesions in dogs: Histological and confocal microscopy study. Exp Parasitol 2022; 242:108342. [PMID: 35987406 DOI: 10.1016/j.exppara.2022.108342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Revised: 02/22/2022] [Accepted: 07/25/2022] [Indexed: 11/16/2022]
Abstract
Extracellular matrix (ECM) alterations in visceral leishmaniasis are related mainly to collagen deposition (fibropoiesis). In canine visceral leishmaniasis (CVL), an intense fibrosis associated to chronic inflammation in organs such as kidneys is described. However, renal fibropoiesis has not been described in natural or experimental infections with L. (L.) infantum. We aimed to characterize renal nephropathies by histology and confocal microscopy comparing renal lesions in dogs naturally and experimentally infected with L. (L.) infantum. Sixty-two mixed-breed symptomatic dogs naturally infected with L. (L.) infantum, sixteen beagles experimentally infected with two strains of L. infantum (eleven dogs with the BH400 strain and five dogs with the BH401 strain), and four uninfected beagles (controls) were used. Samples were stained with hematoxylin & eosin for routine histology. Congo red was used to visualize amyloid protein deposits, periodic acid-Schiff to identify glomerular basal membrane anomalies, Masson's trichrome for collagen deposits, and Jones' methenamine silver to reveal membranous glomerulonephropathy. Immunohistochemistry was used to identify Leishmania amastigotes, and confocal microscopy was used for macrophage characterization (L1/calprotectin and CD163 antigen receptors). The most common lesions were chronic glomerular and interstitial nephritis, which was found in all naturally infected dogs and dogs experimentally infected with L. infantum strain BH401 but not with the BH400 strain. Glomeruloesclerosis was the main lesion presented in all BH401 group. Morphometric analysis revealed positive correlation of renal glomeruli tufts with cellular expression of L1/calprotectin and CD163 antigens. Leishmania infantum strain BH401 shows pathogenicity that may be sufficient to induce classic chronic visceral renal leishmaniasis.
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Affiliation(s)
- Adriano Francisco Alves
- Departamento de Patologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, Minas Gerais, Brazil; Departamento de Fisiologia e Patologia, Centro de Ciências da Saúde, Universidade Federal da Paraiba, João Pessoa, PB, CEP 58050-585, Brazil
| | - Ramon de Alencar Pereira
- Departamento de Patologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, Minas Gerais, Brazil
| | - Michele A Rodrigues
- Departamento de Imunologia e Bioquímica, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, Minas Gerais, Brazil
| | - Leandro Soares Campos
- Departamento de Patologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, Minas Gerais, Brazil
| | - Daniel Dias do Carmo
- Departamento de Patologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, Minas Gerais, Brazil
| | - Pedro Paulo de Abreu Teles
- Departamento de Patologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, Minas Gerais, Brazil
| | - Helida Monteiro Andrade
- Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, Minas Gerais, Brazil
| | - Stanley Almeida de Araújo
- Departamento de Anatomia Patológica, Departamento de Ciências Biológicas (DCBI), Universidade Federal de Ouro Preto, Ouro Preto, Brazil
| | - Dawidson Assis Gomes
- Departamento de Imunologia e Bioquímica, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, Minas Gerais, Brazil
| | - Wagner Luiz Tafuri
- Departamento de Patologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, Minas Gerais, Brazil.
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Kopecny L, Palm CA, Brust K, Giuffrida MA, Cowgill LD, Johnson EG. Association of ultrasonographic features with histologic findings in 71 dogs with protein-losing nephropathy (2008-2018). Am J Vet Res 2022; 83:33-41. [PMID: 34773703 DOI: 10.2460/ajvr.21.09.0145] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To determine whether ultrasonographic features in dogs with protein-losing nephropathy (PLN) were associated with renal biopsy findings and compare corticomedullary ratios between dogs with PLN versus non-renal disease. ANIMALS 71 dogs with PLN and 33 dogs without renal disease. PROCEDURES Medical records and archived ultrasonographic images for dogs with PLN that underwent renal biopsy between 2008 and 2018 were reviewed. Corticomedullary ratios were measured. RESULTS In dogs with PLN, median serum creatinine and BUN concentrations and urine-protein-to-creatinine-ratio prior to renal biopsy were 3.4 mg/dL (interquartile range [IQR], 1.2 to 5.3 mg/dL), 80 mg/dL (IQR, 28 to 105 mg/dL), and 11.4 (IQR, 6.4 to 18.3), respectively. Histologic abnormalities within the tubulointerstitial space were associated with cortical echogenicity. Gastric wall thickness > 5 mm was associated with a histologic diagnosis of acute glomerular disease. Dogs with immune complex-mediated glomerular disease were more likely to have abnormal gastric mural architecture. Other ultrasonographic features of the kidneys, liver, and stomach and the presence of ascites did not help to differentiate immune complex-mediated from non-immune complex-mediated glomerular disease, acute from chronic disease, or amyloid from non-amyloid disease or distinguish whether tubulointerstitial disease was present or absent. Median left corticomedullary ratio for 66 dogs with PLN (1.2) was significantly higher than that for the 33 dogs without renal disease (1.0). Clinical Relevance Ultrasonographic features were poorly associated with specific pathological disorders in dogs with PLN. In this study, the corticomedullary ratio was higher in dogs with PLN, indicating the presence of cortical thickening, but the clinical relevance is unknown.
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Affiliation(s)
- Lucy Kopecny
- Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California-Davis, Davis, CA
| | - Carrie A Palm
- Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California-Davis, Davis, CA
| | - Kelsey Brust
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California-Davis, Davis, CA
| | - Michelle A Giuffrida
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California-Davis, Davis, CA
| | - Larry D Cowgill
- Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California-Davis, Davis, CA
| | - Eric G Johnson
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California-Davis, Davis, CA
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Quimby J, Erickson A, Mcleland S, Cianciolo R, Maranon D, Lunn K, Elliott J, Lawson J, Hess A, Paschall R, Bailey S. Renal Senescence, Telomere Shortening and Nitrosative Stress in Feline Chronic Kidney Disease. Vet Sci 2021; 8:vetsci8120314. [PMID: 34941841 PMCID: PMC8703545 DOI: 10.3390/vetsci8120314] [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: 10/07/2021] [Revised: 11/12/2021] [Accepted: 12/02/2021] [Indexed: 01/15/2023] Open
Abstract
Kidney tissues from cats with naturally occurring chronic kidney disease (CKD) and adult and senior cats without CKD were assessed to determine whether telomere shortening and nitrosative stress are associated with senescence in feline CKD. The histopathologic assessment of percent global glomerulosclerosis, inflammatory infiltrate, and fibrosis was performed. Senescence and nitrosative stress were evaluated utilizing p16 and iNOS immunohistochemistry, respectively. Renal telomere length was evaluated using telomere fluorescent in situ hybridization combined with immunohistochemistry. CKD cats were found to have significantly increased p16 staining in both the renal cortex and corticomedullary junction compared to adult and senior cats. Senior cats had significantly increased p16 staining in the corticomedullary junction compared to adult cats. p16 staining in both the renal cortex and corticomedullary junction were found to be significantly correlated with percent global glomerulosclerosis, cortical inflammatory infiltrate, and fibrosis scores. p16 staining also correlated with age in non-CKD cats. Average telomere length was significantly decreased in CKD cats compared to adult and senior cats. CKD cats had significantly increased iNOS staining compared to adult cats. Our results demonstrate increased renal senescence, telomere shortening, and nitrosative stress in feline CKD, identifying these patients as potential candidates for senolytic therapy with translational potential.
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Affiliation(s)
- Jessica Quimby
- Department of Veterinary Clinical Sciences, The Ohio State University, Columbus, OH 43210, USA; (A.E.); (R.P.)
- Correspondence: ; Tel.: +1-614-292-3551
| | - Andrea Erickson
- Department of Veterinary Clinical Sciences, The Ohio State University, Columbus, OH 43210, USA; (A.E.); (R.P.)
| | - Shannon Mcleland
- International Veterinary Renal Pathology Service, Department of Veterinary Biosciences, The Ohio State University, Columbus, OH 43210, USA; (S.M.); (R.C.)
| | - Rachel Cianciolo
- International Veterinary Renal Pathology Service, Department of Veterinary Biosciences, The Ohio State University, Columbus, OH 43210, USA; (S.M.); (R.C.)
| | - David Maranon
- Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, CO 80521-1618, USA; (D.M.); (S.B.)
| | - Katharine Lunn
- Department of Clinical Sciences, North Carolina State University, Raleigh, NC 27695-0001, USA;
| | - Jonathan Elliott
- Department of Comparative Biomedical Sciences, Royal Veterinary College, London E16 2PX, UK;
| | - Jack Lawson
- Department of Clinical Sciences and Services, Royal Veterinary College, Herts AL9 7TA, UK;
| | - Ann Hess
- Department of Statistics, Colorado State University, Fort Collins, CO 80521-4593, USA;
| | - Rene Paschall
- Department of Veterinary Clinical Sciences, The Ohio State University, Columbus, OH 43210, USA; (A.E.); (R.P.)
| | - Susan Bailey
- Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, CO 80521-1618, USA; (D.M.); (S.B.)
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12
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Casado Bregón D, Cianciolo RE, Smith VA. The use of telmisartan in combination therapy in the management of nephrotic syndrome due to non‐immune‐mediated glomerulonephropathy in a young cat. VETERINARY RECORD CASE REPORTS 2021. [DOI: 10.1002/vrc2.210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- David Casado Bregón
- North Downs Specialist Referrals Bletchingley UK
- Southfields Veterinary Specialists Basildon UK
| | - Rachel E. Cianciolo
- Department of Veterinary Biosciences Ohio State University Columbus Ohio USA
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13
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Kohnken R, Himmel L, Logan M, Peterson R, Biswas S, Dunn C, LeRoy B. Symmetric Dimethylarginine Is a Sensitive Biomarker of Glomerular Injury in Rats. Toxicol Pathol 2021; 50:176-185. [PMID: 34634957 DOI: 10.1177/01926233211045341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Glomerular filtration rate is the gold-standard method for assessment of renal function but is rarely performed in routine toxicity studies. Standard serum biomarkers of renal function are insensitive and become elevated only with significant loss of organ function. Symmetric dimethylarginine (SDMA) is a ubiquitous analyte that is freely filtered by the glomerulus and can be detected in serum. It has shown utility for the detection of renal injury in dogs and cats in clinical veterinary practice, but the potential utility of SDMA to detect renal injury in preclinical species or toxicity studies has not been thoroughly investigated. We utilized a well-characterized glomerular toxicant, puromycin aminonucleoside, to induce podocyte injury and subsequent proteinuria in young male Sprague-Dawley rats. At the end of 1 or 2 weeks, blood, urine, and kidney tissue were collected for analysis. One week following a single 50 mg/kg dose, urea nitrogen, creatinine, and albumin mean values were within historical control ranges, while SDMA was increased. Glomerular changes in these animals included periodic acid-Schiff positive globules within podocytes, podocyte hypertrophy by light microscopy, and podocyte degeneration with effacement of foot processes by electron microscopy (EM). Taken together, our data indicate that SDMA may be a useful biomarker for early detection of glomerular toxicities in rats.
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Affiliation(s)
| | | | | | | | | | | | - Bruce LeRoy
- Preclinical Safety, AbbVie, North Chicago, IL, USA
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14
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Matchimakul P, Pongkan W, Kongtung P, Mektrirat R. Comparative quantitation of aquaporin-2 and arginine vasopressin receptor-2 localizations among chronic kidney disease and healthy kidney in dogs. Vet World 2021; 14:2773-2781. [PMID: 34903939 PMCID: PMC8654747 DOI: 10.14202/vetworld.2021.2773-2781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Accepted: 09/09/2021] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND AND AIM Aquaporin-2 (AQP2) and arginine vasopressin receptor-2 (AVPR2) are proteins that control water homeostasis in principal cells. Chronic kidney disease (CKD) is defined as the impairment and irreversible loss of kidney function and/or structure, which causes water imbalances and polyuria. The study aimed to know the expression of AQPs and AVPR2 in the kidneys of a canine with CKD. MATERIALS AND METHODS The kidneys were collected from two dog carcasses from Small Animal Teaching Hospital, Faculty of Veterinary Medicine, Chiang Mai University. The kidney tissue was prepared for immunohistochemistry and investigated the expression and localization of tissue's AQP2 and AVPR2. For statistical analysis, the Mann-Whitney U-test was applied to the data. RESULTS By immunohistochemistry, AQP2 was expressed strongly in the basolateral and apical membranes of the principal cells, whereas AVPR2 was localized in the principal cell's basolateral membrane in both renal cortex and renal medulla. In the normal kidney, the semi-quantitative immunohistochemistry for the percentage of protein expression of AQP2 and AVPR2 was 5.062±0.4587 and 4.306±0.7695, respectively. In contrast, protein expression of AQP2 and AVPR2 in CKD was found to be 1.218±0.1719 and 0.8536±0.1396, respectively. The data shows that the percentage of AQP2 and AVPR2 expression was decreased, corresponding to a 4-fold and 5-fold in CKD (p<0.001). CONCLUSION Our findings revealed that CKD was a marked decrease in AQP2 and AVPR2 expression. The central role of specific AQP2 and AVPR2 in regulating water homeostasis will provide correlations in case of CKD with polyuria.
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Affiliation(s)
- Pitchaya Matchimakul
- Department of Veterinary Bioscience and Veterinary Public Health, Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai 50100, Thailand
- Integrative Research Center for Veterinary Circulatory Sciences, Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai 50100, Thailand
| | - Wanpitak Pongkan
- Department of Veterinary Bioscience and Veterinary Public Health, Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai 50100, Thailand
- Integrative Research Center for Veterinary Circulatory Sciences, Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai 50100, Thailand
| | - Piyamat Kongtung
- Central Laboratory, Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai 50100, Thailand
| | - Raktham Mektrirat
- Department of Veterinary Bioscience and Veterinary Public Health, Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai 50100, Thailand
- Integrative Research Center for Veterinary Circulatory Sciences, Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai 50100, Thailand
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15
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Roura X, Cortadellas O, Day MJ, Benali SL, Zatelli A. Canine leishmaniosis and kidney disease: Q&A for an overall management in clinical practice. J Small Anim Pract 2020; 62:E1-E19. [PMID: 33107613 DOI: 10.1111/jsap.13237] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 09/10/2020] [Indexed: 12/19/2022]
Affiliation(s)
- X Roura
- Hospital Clínic Veterinari, Universitat Autònoma de Barcelona, 08193, Bellaterra, Spain
| | - O Cortadellas
- Hospital Clínico Veterinario, Universidad CEU Cardenal Herrera, 46115, Valencia, Spain
| | - M J Day
- School of Veterinary and Life Sciences, Murdoch University, 6150, Murdoch, Australia
| | - S L Benali
- Laboratorio La Vallonea, 20017, Milano, Italy
| | | | - A Zatelli
- Dipartimento di Medicina Veterinaria, Università degli Studi di Bari "Aldo Moro", 70010, Bari, Italy
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16
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Lorbach SK, Hokamp JA, Quimby JM, Cianciolo RE. Clinicopathologic characteristics, pathology, and prognosis of 77 dogs with focal segmental glomerulosclerosis. J Vet Intern Med 2020; 34:1948-1956. [PMID: 33463760 PMCID: PMC7517845 DOI: 10.1111/jvim.15837] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 06/12/2020] [Accepted: 06/13/2020] [Indexed: 11/27/2022] Open
Abstract
BACKGROUND Focal segmental glomerulosclerosis (FSGS) is a common cause of nonimmune complex glomerulopathy and the prognosis and clinicopathologic findings associated with this condition have not been described in dogs. OBJECTIVE To characterize the presentation and identify clinical factors associated with the survival of dogs with FSGS. ANIMALS Seventy-seven dogs diagnosed with FSGS based on evaluation of renal biopsy samples submitted to the International Veterinary Renal Pathology Service. METHODS Retrospective review of medical records of dogs biopsied for evaluation of proteinuria between January 2015 and May 2017. RESULTS The incidence of FSGS among all dogs biopsied for proteinuria was 26%. Significantly more females (48; 62.3%) than males (29; 37.7%) were affected (P = .04). At the time of biopsy, median serum creatinine concentration (SCr) was 1.2 mg/dL (range, 0.3-8.7), median serum albumin concentration (Alb) was 2.8 g/dL (range, 1.1-4.6), median systolic blood pressure was 153.5 mm Hg (range, 95-260), and median urine protein : creatinine ratio was 5.9 (range, 1.4-22). Median survival time after biopsy was 258 days (range, 26-1003) for dogs that died from all causes (n = 32). Factors that were associated with a shorter survival time included SCr ≥ 2.1 mg/dL (P < .01) and Alb < 2 g/dL (P < .01). CONCLUSIONS AND CLINICAL IMPORTANCE Most dogs with FSGS were female, and although commonly hypertensive, azotemia, severe hypoalbuminemia and ascites or edema were observed infrequently. Variables significantly associated with survival time were SCr and Alb.
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Affiliation(s)
- Sarah K. Lorbach
- Department of Veterinary Clinical Sciences, College of Veterinary MedicineThe Ohio State UniversityColumbusOhioUSA
| | - Jessica A. Hokamp
- Department of Veterinary Biosciences, College of Veterinary MedicineThe Ohio State UniversityColumbusOhioUSA
- International Veterinary Renal Pathology Service (IVRPS), Combined Service at The Ohio State University, Columbus, Ohio and Texas A&MCollege StationTexasUSA
| | - Jessica M. Quimby
- Department of Veterinary Clinical Sciences, College of Veterinary MedicineThe Ohio State UniversityColumbusOhioUSA
| | - Rachel E. Cianciolo
- Department of Veterinary Biosciences, College of Veterinary MedicineThe Ohio State UniversityColumbusOhioUSA
- International Veterinary Renal Pathology Service (IVRPS), Combined Service at The Ohio State University, Columbus, Ohio and Texas A&MCollege StationTexasUSA
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17
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Gasser B, Uscategui RAR, Maronezi MC, Pavan L, Simões APR, Martinato F, Silva P, Crivellenti LZ, Feliciano MAR. Clinical and ultrasound variables for early diagnosis of septic acute kidney injury in bitches with pyometra. Sci Rep 2020; 10:8994. [PMID: 32488080 PMCID: PMC7265446 DOI: 10.1038/s41598-020-65902-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 05/12/2020] [Indexed: 01/26/2023] Open
Abstract
The aetiology of septic acute kidney injury (AKI) is not completely elucidated. Early identification of AKI in septic patients is considered to improve survival rate since it allows rapid treatment onset. We evaluated clinical, haematological, urinary, B-mode, spectral Doppler, and contrast-enhanced ultrasound variables in 20 bitches with pyometra as sepsis models and 12 healthy controls. All animals with pyometra presented some degree of renal damage on histological examination; however, sequential organ failure assessment (SOFA) classified only 40% cases with sepsis. AKI derived from systemic infection was identified in 57% of cases with hypoperfusion and in 22% with inflammation, being an affection of multifactorial origin. Among the evaluated parameters, urinary protein/creatinine ratio >0.15, serum albumin <2.94 mg/dL, time-averaged minimum velocity <21.5 cm/s, renal length/aorta diameter ratio >5.93, pulsatility index >1.53, haematocrit <45%, time-averaged maximum velocity <45.7 cm/s, haemoglobin <16 g/dL, leukocytes >12.53 × 103/uL, and cortical contrast peak intensity <69%, in the order of accuracy, are significant indicators of septic AKI with an accuracy >80%. Thus, AKI is a very prevalent condition in septic patients, derived mainly from changes in renal perfusion and inflammation. Additionally, reviewing the SOFA score parameters is suggested to identify renal failure.
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Affiliation(s)
- Beatriz Gasser
- School of Agrarian Sciences and Veterinary Medicine, São Paulo State University "Julio de Mesquita Filho", Jaboticabal, São Paulo, Brazil.
| | | | - Marjury Cristina Maronezi
- School of Agrarian Sciences and Veterinary Medicine, São Paulo State University "Julio de Mesquita Filho", Jaboticabal, São Paulo, Brazil
| | - Letícia Pavan
- School of Agrarian Sciences and Veterinary Medicine, São Paulo State University "Julio de Mesquita Filho", Jaboticabal, São Paulo, Brazil
| | - Ana Paula Rodrigues Simões
- School of Agrarian Sciences and Veterinary Medicine, São Paulo State University "Julio de Mesquita Filho", Jaboticabal, São Paulo, Brazil
| | - Fernanda Martinato
- School of Agrarian Sciences and Veterinary Medicine, São Paulo State University "Julio de Mesquita Filho", Jaboticabal, São Paulo, Brazil
| | - Priscila Silva
- School of Agrarian Sciences and Veterinary Medicine, São Paulo State University "Julio de Mesquita Filho", Jaboticabal, São Paulo, Brazil
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18
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Rayhel LH, Quimby JM, Cianciolo RE, Cléroux A, McLeland SM, Franken T. Clinicopathologic and pathologic characteristics of feline proteinuric kidney disease. J Feline Med Surg 2020; 22:1219-1229. [PMID: 32456516 PMCID: PMC7736400 DOI: 10.1177/1098612x20921056] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVES The aim of this study was to describe the causes, clinicopathologic features and outcomes of feline protein-losing nephropathy (proteinuria secondary to glomerular disease [PLN]). METHODS Kidney biopsy/necropsy samples from proteinuric cats submitted to the International Veterinary Renal Pathology Service were retrospectively reviewed. Diagnoses based on histopathology were categorized by primary disease compartment. Clinicopathologic variables at diagnosis, development of hypoalbuminemia, anemia, hypertension, azotemia and effusion/edema, and survival were compared between cats with immune-complex glomerulonephritis (ICGN) and other causes of PLN. RESULTS Fifty-eight percent (n = 31/53) of proteinuric cats had ICGN and 74% (n = 31/42) of cats with PLN had ICGN. Cats with glomerular diseases other than ICGN had a higher median urine protein:creatinine ratio than ICGN cats (14.5 vs 6.5; P <0.001). Onset of PLN occurred at a young age; median age at diagnosis was 3.5 years in ICGN cats vs 1.3 years in cats with other glomerular diseases (P = 0.026). Development of complications such as hypoalbuminemia, anemia, hypertension, azotemia and effusion/edema were common, regardless of the cause of PLN, and were not different between ICGN and cats with other glomerular diseases. Male cats were over-represented in the ICGN group (P = 0.003). Median survival time (MST) for all cats with PLN was 94 days (range 3-1848 days). Survival was not different between cats with ICGN and cats with other glomerular diseases. MST in ICGN cats that developed effusion was shorter (94 days) than cats that did not (700 days; P = 0.035). MST in IGCN cats that received immunosuppressive medications was longer (244 days) than cats that did not (17 days, P = 0.039). CONCLUSIONS AND RELEVANCE Taken together, these data suggest that clinical suspicion for glomerular proteinuria should increase in young, male cats with higher degrees of proteinuria, and immune-mediated disease is common. Further studies are needed to determine the effect of immunosuppression on morbidity and mortality in cats with ICGN.
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Affiliation(s)
- Laura H Rayhel
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH, USA
| | - Jessica M Quimby
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH, USA
| | - Rachel E Cianciolo
- International Veterinary Renal Pathology Service, Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH, USA
| | - Andréanne Cléroux
- Department of Clinical Sciences & Advanced Medicine, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Shannon M McLeland
- International Veterinary Renal Pathology Service, Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH, USA
| | - Toni Franken
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH, USA
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19
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Purswell EK, Lashnits EW, Breitschwerdt EB, Vaden SL. A retrospective study of vector-borne disease prevalence in dogs with proteinuria: Southeastern United States. J Vet Intern Med 2020; 34:742-753. [PMID: 31916316 PMCID: PMC7096618 DOI: 10.1111/jvim.15610] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Accepted: 08/20/2019] [Indexed: 12/18/2022] Open
Abstract
Background Proteinuria is a risk factor for progressive kidney injury in dogs. Enhanced understanding of potential associations between canine vector‐borne diseases (CVBD) and proteinuria is needed. Objectives To determine the proportion of evaluated proteinuric dogs exposed to ≥1 CVBD, including Babesia spp., Ehrlichia spp., spotted‐fever group Rickettsia, Bartonella spp., Anaplasma spp., hemotropic Mycoplasma spp., Borrelia burgdorferi, and Dirofilaria immitis, and to determine if demographic or clinicopathologic differences exist between proteinuric dogs exposed to CVBD versus proteinuric dogs with no evidence of CVBD exposure. Animals Two‐hundred nine proteinuric dogs, concurrently tested for CVBD, which were examined at a single academic veterinary hospital between January 2008 and December 2015. Methods Retrospective cross‐sectional study. Demographic, clinicopathologic, and CVBD test results were extracted from medical records. A multivariable logistic regression model was used to assess associations between CVBD and selected variables. Results Based on serology and polymerase chain reaction testing, 34% of proteinuric dogs (72/209) were exposed to ≥1 CVBD. Exposure to Rickettsia spp. (19%), Ehrlichia spp. (12%), and B. burgdorferi (9%) were most common. The CVBD exposure was lower in dogs tested in autumn or spring, higher in intact dogs, and higher in dogs with lower serum albumin and higher serum creatinine concentrations. Conclusions and Clinical Importance Exposure to CVBD, particularly exposure to Rickettsia spp., Ehrlichia spp., and B. burgdorferi was found in proteinuric dogs from the southeast United States. Additional controlled prospective studies examining a potential causal relationship between CVBD and proteinuria are warranted.
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Affiliation(s)
- Emily K Purswell
- The Department of Clinical Sciences and North Carolina State University, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina
| | - Erin W Lashnits
- The Department of Clinical Sciences and North Carolina State University, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina
| | - Edward B Breitschwerdt
- The Department of Clinical Sciences and North Carolina State University, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina
| | - Shelly L Vaden
- The Department of Clinical Sciences and North Carolina State University, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina
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20
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Burti S, Zotti A, Bonsembiante F, Mastellaro G, Banzato T. Correlation between renal histopathology and renal ultrasound in dogs. Res Vet Sci 2020; 129:59-65. [PMID: 31931264 DOI: 10.1016/j.rvsc.2020.01.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 12/23/2019] [Accepted: 01/02/2020] [Indexed: 11/15/2022]
Abstract
Fifty-three privately owned dogs were included in the study. Ultrasonography of the kidneys was performed ante mortem. All the dogs died or were euthanized for reasons unrelated to this study. Histopathology of both kidneys was performed, and a degeneration and an inflammation score ranging from zero to two was assigned by consensus between two pathologists. A numerical score based on a three level semi-quantitative scale (0, 0.5, 1) was assigned by consensus between two of the authors to the following ultrasonographic abnormalities: cortico-medullary definition, echogenicity of the renal cortex, echogenicity of the medulla, renal shape, cysts, scars, mineralizations, subcapsular perirenal fluid accumulation, pyelectasia. The scores deriving from the consensus were summed to create a summary index called renal ultrasound score (RUS). Statistically significant differences in cortico-medullary definition, echogenicity of the renal cortex, echogenicity of the medulla, renal shape, scars and pyelectasia were evident between the degeneration score groups. There were significantly different distributions of cortico-medullary definition, renal shape and scars between the inflammatory score groups. There were statistically significant differences in the RUS between the degenerative score groups (F = 24.154, p-value<.001). Post-hoc tests revealed significant differences between all groups. There were no significant differences in the RUS between the inflammatory score groups (F = 1.312, p-value = .264). Post-hoc tests revealed no significant differences between groups. The results of the present study suggest that the number and severity of the ultrasonographic abnormalities are correlated with the severity of the kidney degeneration. On the other hand, inflammation showed poor influence on the ultrasonographic appearance of the kidneys.
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Affiliation(s)
- Silvia Burti
- Department of Animal Medicine, Production and Health, University of Padua, Viale dell'Università 16, Agripolis, Legnaro, 35020, Padua, Italy
| | - Alessandro Zotti
- Department of Animal Medicine, Production and Health, University of Padua, Viale dell'Università 16, Agripolis, Legnaro, 35020, Padua, Italy
| | - Federico Bonsembiante
- Department of Animal Medicine, Production and Health, University of Padua, Viale dell'Università 16, Agripolis, Legnaro, 35020, Padua, Italy; Department of Comparative Biomedicine and Food Science, University of Padua, Viale dell'Università 16, Agripolis, Legnaro, 35020 Padua, Italy
| | - Giorgia Mastellaro
- Department of Animal Medicine, Production and Health, University of Padua, Viale dell'Università 16, Agripolis, Legnaro, 35020, Padua, Italy
| | - Tommaso Banzato
- Department of Animal Medicine, Production and Health, University of Padua, Viale dell'Università 16, Agripolis, Legnaro, 35020, Padua, Italy.
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21
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Early Detection of Active Glomerular Lesions in Dogs and Cats Using Podocin. J Vet Res 2019; 63:573-577. [PMID: 31934669 PMCID: PMC6950428 DOI: 10.2478/jvetres-2019-0062] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Accepted: 11/05/2019] [Indexed: 12/04/2022] Open
Abstract
In veterinary medicine, sensitive and specific markers of the early stages of renal failure still remain to be established. Podocytes could be a promising diagnostic tool in veterinary nephrology, especially in the differentiation of active pathological disease and glomerulopathies. Podocin is one of the robust proteins exploitable in detection of podocyturia. This article presents podocyte detection in urine for diagnostic purposes in veterinary medicine using a variety of methods. We describe the advantages and disadvantages of the immunohistochemical technique currently used, and of scanning microscopy, chromatography, and immunostaining. The identification of podocin-positive cells is a promising diagnostic tool in the detection of the early stages of glomerular basement membrane damage. The detection of renal failure prior to the occurrence of azotaemia is of high clinical importance from the clinical and scientific points of view.
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22
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Vessieres F, Cianciolo RE, Gkoka ZG, Kisielewicz C, Bazelle J, Seth M, Adam FH, Matiasovic M, Aresu L, Jepson RE, Walker DJ. Occurrence, management and outcome of immune-complex glomerulonephritis in dogs with suspected glomerulopathy in the UK. J Small Anim Pract 2019; 60:683-690. [PMID: 31512262 DOI: 10.1111/jsap.13065] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Revised: 04/28/2019] [Accepted: 07/30/2019] [Indexed: 11/29/2022]
Abstract
OBJECTIVES To determine the proportion of dogs diagnosed with immune-complex glomerulonephritis in a large cohort of UK dogs with clinical suspicion of glomerular disease in which renal histopathology, including routine light microscopy, transmission electron microscopy and immunofluorescence, had been performed. The second objective was to describe treatment and long-term clinical outcome of dogs diagnosed with immune-complex glomerulonephritis. MATERIALS AND METHODS Sixty-two UK dogs that underwent renal biopsies for investigation of suspected glomerulopathy (urine protein-to-creatinine ratio persistently >0.5) were included in this retrospective multicentre study. Signalment, clinico-pathological abnormalities, histopathological diagnosis, treatment following diagnosis and survival were recorded. RESULTS Seventeen (27%) of the dogs with suspected glomerular disease were diagnosed with immune-complex glomerulonephritis and nine (53%) of these were still alive at the study end point, with a median follow-up of 366 days (range 52 to 1299). Six dogs diagnosed with immune-complex glomerulonephritis were treated with mycophenolate. Four received mycophenolate alone for immunosuppression and two received mycophenolate and chlorambucil; all these six dogs were alive at data collection [median follow-up time 712.5 days (range 73 to 1299)]. Seven dogs diagnosed with immune-complex glomerulonephritis did not receive immunosuppressive treatment; only one of these dogs was alive at study end point [median survival time 302 days (range 52 to 723)]. CLINICAL SIGNIFICANCE Immune-complex glomerulonephritis may be less common in the UK than previously reported in North America and mainland Europe, reducing the likelihood of treatment modification following renal biopsy. Mycophenolate was the most commonly used immunosuppressant for cases of immune-complex glomerulonephritis.
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Affiliation(s)
- F Vessieres
- Anderson Moores Veterinary Specialists, SO212LL, Hursley, UK
| | - R E Cianciolo
- Department of Veterinary Biosciences, International Veterinary Renal Pathology Service, The Ohio State University, Columbus, Ohio, 43210, USA
| | - Z G Gkoka
- Anderson Moores Veterinary Specialists, SO212LL, Hursley, UK
| | - C Kisielewicz
- Small Animal Internal Medicine Department, Pride Veterinary Centre, DE24 8HX, Derby, UK
| | - J Bazelle
- Small Animal Internal Medicine Department, Davies Veterinary Specialists, SG5 3HR, Higham Gobion, UK
| | - M Seth
- Small Animal Internal Medicine Department, Animal Health Trust, CB8 7UU, Newmarket, UK
| | - F H Adam
- Small Animal Internal Medicine Department, North Downs Specialist Referrals, RH1 4QP, Bletchingley, UK
| | - M Matiasovic
- Small Animal Surgery Department, Small Animal Referral Hospital, School of Veterinary Sciences , University of Bristol, BS405DU, Langford, UK
| | - L Aresu
- Dipartimento di Scienze Veterinarie, Università degli Studi di Torino, 10095, Grugliasco, Italy
| | - R E Jepson
- Clinical Science and Services, The Royal Veterinary College, AL97TA, Hatfield, UK
| | - D J Walker
- Anderson Moores Veterinary Specialists, SO212LL, Hursley, UK
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Szczepankiewicz B, Bąchor R, Pasławski R, Siwińska N, Pasławska U, Konieczny A, Szewczuk Z. Evaluation of Tryptic Podocin Peptide in Urine Sediment Using LC-MS-MRM Method as a Potential Biomarker of Glomerular Injury in Dogs with Clinical Signs of Renal and Cardiac Disorders. Molecules 2019; 24:molecules24173088. [PMID: 31454880 PMCID: PMC6749423 DOI: 10.3390/molecules24173088] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2019] [Revised: 08/19/2019] [Accepted: 08/23/2019] [Indexed: 01/31/2023] Open
Abstract
The early asymptomatic stage of glomerular injury is a diagnostic challenge in the course of renal and extra-renal disease, e.g., heart insufficiency. It was found that podocin, a podocyte-specific protein present in the urine, may serve as a biomarker in the diagnosis of glomerular disease in humans and animals including glomerulonephritis, glomerulosclerosis, amyloidosis, or nephropathy. Therefore, there is a need of development of the sensitive and straightforward method of urinary podocin identification. In this work, we report our extended research under the glomerular injury investigation in dogs by application of clinical examination and LC-MS-MRM method in the identification of canine podocin in urine samples. The LC-MS-MRM method is based on the identification of podocin tryptic peptide with the 218H-AAEILAATPAAVQLR-OH232 sequence. The model peptide was characterized by the highest ionization efficiency of all the proposed model podocin tryptic peptides in a canine urine sediment according to the LC-MS/MS analysis. The obtained results revealed the presence of the model peptide in 40.9% of dogs with MMVD (active glomerular injury secondary to heart disease = cardiorenal syndrome-CRS) and 33.3% dogs with chronic kidney disease. The potential applicability of the developed methodology in the analysis of podocin in canine urine sediments was confirmed.
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Affiliation(s)
- Barbara Szczepankiewicz
- Department of Internal Diseases with Clinic for Horses, Dogs and Cats, Faculty of Veterinary Medicine, Wroclaw University of Environmental and Life Sciences, Pl. Grunwaldzki 47, 50-366 Wrocław, Poland.
| | - Remigiusz Bąchor
- Faculty of Chemistry, University of Wroclaw, F. Joliot-Curie 14, 50-383 Wroclaw, Poland.
| | - Robert Pasławski
- Veterinary Centre Nicolaus Copernicus University Toruń, Gagarina 7, 87-100 Toruń, Poland
| | - Natalia Siwińska
- Department of Internal Diseases with Clinic for Horses, Dogs and Cats, Faculty of Veterinary Medicine, Wroclaw University of Environmental and Life Sciences, Pl. Grunwaldzki 47, 50-366 Wrocław, Poland
| | - Urszula Pasławska
- Department of Internal Diseases with Clinic for Horses, Dogs and Cats, Faculty of Veterinary Medicine, Wroclaw University of Environmental and Life Sciences, Pl. Grunwaldzki 47, 50-366 Wrocław, Poland
- Veterinary Centre Nicolaus Copernicus University Toruń, Gagarina 7, 87-100 Toruń, Poland
| | - Andrzej Konieczny
- Department of Nephrology and Transplantation Medicine, Wroclaw Medical University, Borowska 213, 50-556 Wroclaw, Poland
| | - Zbigniew Szewczuk
- Faculty of Chemistry, University of Wroclaw, F. Joliot-Curie 14, 50-383 Wroclaw, Poland
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24
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Rossi F, Aresu L, Martini V, Trez D, Zanetti R, Coppola LM, Ferri F, Zini E. Immune-complex glomerulonephritis in cats: a retrospective study based on clinico-pathological data, histopathology and ultrastructural features. BMC Vet Res 2019; 15:303. [PMID: 31429743 PMCID: PMC6702729 DOI: 10.1186/s12917-019-2046-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Accepted: 08/11/2019] [Indexed: 01/03/2023] Open
Abstract
BACKGROUND Chronic kidney disease (CKD) has typically a non-immune mediated origin in cats and immune-complex glomerulonephritis (ICGN) is scarcely described. Aims of this study were to characterize ICGN by light and electron microscopy and identify associations with clinico-pathological findings. In addition, comparisons between cats with ICGN and non immune-complex glomerulonephritis (non-ICGN) were performed. Renal samples examined between 2010 and 2019 were considered if both light and electron microscopy were performed. Signalment, feline immunodeficiency virus (FIV) and leukemia virus (FeLV) status, serum creatinine concentration, urine protein-to-creatinine (UPC) ratio, systolic blood pressure (SBP) and International Renal Interest Society (IRIS) stage were retrieved and used for comparisons. RESULTS Sixty-eight client-owned cats were included. Thirty-seven cats (54.4%) had ICGN and 31 (45.6%) non-ICGN. Eighteen (48.6%) with ICGN had membranous glomerulonephropathy (MGN), 14 (37.8%) membranoproliferative glomerulonephritis (MPGN), and 5 (13.5%) mesangioproliferative glomerulonephritis (MeGN). Clinico-pathological data were not associated with any type of ICGN. Among cats with non-ICGN, 11 (35.5%) had end-stage CKD, 9 (29%) focal segmental glomerulosclerosis, 6 (19.4%) global and multifocal mesangiosclerosis, 2 (6.5%) glomerular atrophy, 2 (6.5%) renal dysplasia and 1 (3.1%) amyloidosis. Eight (25.8%) cats with non-ICGN had chronic interstitial nephritis (CIN) grade 1, 13 (41.9%) grade 2 and 10 (32.3%) grade 3; creatinine and UPC ratio increased with CIN grades (p = 0.001, p < 0.001). Cats with ICGN were more frequently FIV or FeLV-infected (OR:11.4; 95%CI:1.4-94.4; p = 0.024), had higher UPC ratio (OR:6.8; 95%CI:2.5-18.2; p < 0.001) and were younger (OR:0.9; 95%CI:0.7-1.0; p = 0.042) than cats with non-ICGN. CONCLUSIONS MGN and MPGN were the most common morphological diagnoses of ICGN in cats. Unfortunately, none of the investigated findings differentiated ICGN morphological diagnoses. Serum creatinine concentration and UPC ratio were directly associated with grades of CIN (p = 0.001 and p < 0.001, respectively), confirming previous literature. More ICGN than non-ICGN was observed in cats with retroviral infections, younger cats and higher UPC ratio.
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Affiliation(s)
- Francesco Rossi
- Istituto Veterinario di Novara, Strada Provinciale 9, 28060 Granozzo con Monticello (NO), Novara, Italy
| | - Luca Aresu
- Department of Veterinary Science, University of Turin, Largo Braccini 2, 10095 Grugliasco (TO), Italy
| | - Valeria Martini
- Department of Veterinary Medicine, University of Milan, via dell’Università, 26900 Lodi, Italy
| | - Davide Trez
- Department of Comparative Biomedicine and Food Science, University of Padua, Viale dell’Universita 16, 35020 Agripolis Legnaro (PD), Legnaro, Italy
| | - Rossella Zanetti
- Department of Comparative Biomedicine and Food Science, University of Padua, Viale dell’Universita 16, 35020 Agripolis Legnaro (PD), Legnaro, Italy
| | - Luigi Michele Coppola
- Department of Animal Medicine, Production and Health, University of Padua, Viale dell’Universita 16, 35020 Agripolis Legnaro (PD), Legnaro, Italy
| | - Filippo Ferri
- Istituto Veterinario di Novara, Strada Provinciale 9, 28060 Granozzo con Monticello (NO), Novara, Italy
| | - Eric Zini
- Istituto Veterinario di Novara, Strada Provinciale 9, 28060 Granozzo con Monticello (NO), Novara, Italy
- Department of Animal Medicine, Production and Health, University of Padua, Viale dell’Universita 16, 35020 Agripolis Legnaro (PD), Legnaro, Italy
- Clinic for Small Animal Internal Medicine, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 260, 8057 Zurich, Switzerland
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25
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Cianciolo RE, Jennette JC. Glomerulonephritis in Animal Models and Human Medicine: Discovery, Pathogenesis, and Diagnostics. Toxicol Pathol 2018; 46:898-903. [PMID: 30278837 DOI: 10.1177/0192623318800714] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Glomerulonephritis (GN) is inflammation of glomeruli. The four major categories that cause human GN are mediated by immunoglobulin or complement or both, and they include (1) immune complex-mediated GN, (2) anti-glomerular basement membrane-mediated GN, (3) antineutrophil cytoplasmic autoantibody-mediated GN, and (4) complement factor 3 glomerulopathy mediated by complement dysregulation. Initiating processes include infection, autoimmunity, exogenous antigens, and neoplasia. Often there are predisposing and modulating genetic, epigenetic, and/or environmental factors. Animal models facilitated the recognition and elucidation of the pathogeneses of all four categories of GN, and they continue to be used in preclinical studies to identify and validate therapies for all four types of GN. Advanced diagnostic modalities (e.g., transmission electron microscopy and immunofluorescence) are helpful and sometimes required for the correct categorization of GN in humans and animals. This review provides historical background on the discovery of the different GN pathogeneses, describes some of the animal models used to discover and understand each GN pathogenic category, reviews the diagnostic classification of each category of GN, and compares human GN to spontaneous forms of nonhuman GN.
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26
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Caswell JL, Bassel LL, Rothenburger JL, Gröne A, Sargeant JM, Beck AP, Ekman S, Gibson-Corley KN, Kuiken T, LaDouceur EEB, Meyerholz DK, Origgi FC, Posthaus H, Priestnall SL, Ressel L, Sharkey L, Teixeira LBC, Uchida K, Ward JM, Webster JD, Yamate J. Observational Study Design in Veterinary Pathology, Part 2: Methodology. Vet Pathol 2018; 55:774-785. [DOI: 10.1177/0300985818798121] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Observational studies are a basis for much of our knowledge of veterinary pathology, yet considerations for conducting pathology-based observational studies are not readily available. In part 1 of this series, we offered advice on planning and carrying out an observational study. Part 2 of the series focuses on methodology. Our general recommendations are to consider using already-validated methods, published guidelines, data from primary sources, and quantitative analyses. We discuss 3 common methods in pathology research—histopathologic scoring, immunohistochemistry, and polymerase chain reaction—to illustrate principles of method validation. Some aspects of quality control include use of clear objective grading criteria, validation of key reagents, assessing sample quality, determining specificity and sensitivity, use of technical and biologic negative and positive controls, blinding of investigators, approaches to minimizing operator-dependent variation, measuring technical variation, and consistency in analysis of the different study groups. We close by discussing approaches to increasing the rigor of observational studies by corroborating results with complementary methods, using sufficiently large numbers of study subjects, consideration of the data in light of similar published studies, replicating the results in a second study population, and critical analysis of the study findings.
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Affiliation(s)
- Jeff L. Caswell
- Department of Pathobiology, University of Guelph, Guelph, ON, Canada
| | - Laura L. Bassel
- Department of Pathobiology, University of Guelph, Guelph, ON, Canada
| | - Jamie L. Rothenburger
- Department of Ecosystem and Public Health; Canadian Wildlife Health Cooperative (Alberta), Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada
| | - Andrea Gröne
- Department of Pathobiology, Faculty of Veterinary Medicine, Utrecht University, Utrecht, the Netherlands
| | - Jan M. Sargeant
- Department of Population Medicine and Centre for Public Health and Zoonoses, University of Guelph, Guelph, ON, Canada
| | | | - Stina Ekman
- Department of Biomedicine and Veterinary Public Health, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Katherine N. Gibson-Corley
- Department of Pathology, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA, USA
| | - Thijs Kuiken
- Department of Viroscience, Erasmus University Medical Centre, Rotterdam, the Netherlands
| | | | - David K. Meyerholz
- University of Iowa Carver College of Medicine, 1165 Medical Laboratories, University of Iowa Carver College of Medicine, Iowa City, IA, USA
| | - Francesco C. Origgi
- Centre for Fish and Wildlife Health, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Horst Posthaus
- Institute of Animal Pathology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Simon L. Priestnall
- Department of Pathobiology & Population Sciences, Royal Veterinary College, Hatfield, UK
| | - Lorenzo Ressel
- Department of Veterinary Pathology and Public Health, Institute of Veterinary Science, University of Liverpool, Liverpool, UK
| | - Leslie Sharkey
- Department of Clinical Sciences, Cummings School of Veterinary Medicine, North Grafton, MA, USA
| | - Leandro B. C. Teixeira
- Department of Pathobiological Sciences, University of Wisconsin–Madison, Madison, WI, USA
| | - Kazuyuki Uchida
- Department of Veterinary Pathology, University of Tokyo, Tokyo, Japan
| | | | | | - Jyoji Yamate
- Laboratory of Veterinary Pathology, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Izumisano City, Osaka, Japan
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27
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Wong A, Cianciolo RE. Comparison of immunohistochemistry and immunofluorescence techniques using anti-lambda light chain antibodies for identification of immune complex deposits in canine renal biopsies. J Vet Diagn Invest 2018; 30:721-727. [PMID: 30027830 DOI: 10.1177/1040638718786340] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Comprehensive renal biopsy evaluation of canine glomerular disease uses immunofluorescence (IF) labeling of fresh frozen tissue to detect immune complexes that are confirmed with transmission electron microscopy. This methodology requires the veterinarian to harvest additional tissue samples, whereas sections for immunohistochemistry (IHC) could be performed on paraffin sections. If adequate IHC labeling of formalin-fixed, paraffin-embedded tissue was possible, the additional tissue samples would be unnecessary. We compared the specificity and sensitivity of IHC to IF for diagnosis of immune complex-mediated glomerulonephritis (ICGN). Commercial anti-canine IHC and IF antibodies targeting the lambda light chain component of immunoglobulins were evaluated, using previously diagnosed cases of ICGN and cases without immune complexes (non-ICGN). Because the pattern of IF labeling is crucial for accurate interpretation, sections were evaluated by a trained nephropathologist and a novice to assess the impact of experience in the diagnosis of ICGN. Unfortunately, our attempts to develop an IHC protocol that could improve the workflow for clinicians and laboratory personnel were unsuccessful; the IHC protocol did not demonstrate staining patterns that could be detected reliably by either evaluator. Moreover, the IHC antibody demonstrated abundant nonspecific staining in non-ICGN cases, and 60% of true ICGN cases were misdiagnosed as non-ICGN. We did not achieve a reliable IHC protocol for the anti-lambda light chain antibody and, therefore, IF for lambda light chain remains the method of choice for ICGN detection.
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Affiliation(s)
- Agnes Wong
- Department of Comparative Pathobiology, College of Veterinary Medicine, Purdue University, West Lafayette, IN (Wong).,International Veterinary Renal Pathology Service, Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH (Cianciolo)
| | - Rachel E Cianciolo
- Department of Comparative Pathobiology, College of Veterinary Medicine, Purdue University, West Lafayette, IN (Wong).,International Veterinary Renal Pathology Service, Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH (Cianciolo)
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28
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Yau W, Mausbach L, Littman MP, Cianciolo RE, Brown CA. Focal Segmental Glomerulosclerosis in Related Miniature Schnauzer Dogs. Vet Pathol 2017; 55:277-285. [PMID: 29191133 DOI: 10.1177/0300985817736356] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Focal segmental glomerulosclerosis (FSGS) recently has been recognized as a common cause of proteinuria in dogs in general, and in Miniature Schnauzer dogs in particular. This study describes the morphologic features present in the kidneys of 8 related proteinuric Miniature Schnauzer dogs. The FSGS, characterized by solidification of portions of the capillary tuft, affected 32% to 49% of examined glomeruli in these dogs. Synechiae, often accompanied by hyalinosis, were present in 13% to 54% of glomeruli and were more prevalent in older dogs. Seven of 8 dogs had arteriolar hyalinosis. Ultrastructurally, all dogs had evidence of a podocytopathy in the absence of electron-dense deposits, glomerular basement membrane splitting, or fibrils. All dogs had multifocal to extensive podocyte foot process effacement. Other podocyte changes included microvillous transformation, the presence of vacuoles or protein resorption droplets, cytoplasmic electron-dense aggregates, and occasional binucleation. Variable amounts of intraglomerular lipid were present in all dogs. All dogs were proteinuric, with measured values for the urine protein-to-creatinine ratio ranging from 1.2 to 6.5. Azotemia was mild to absent and dogs were euthanatized at 5.1 to 14 years of age, in all cases due to nonrenal diseases. The underlying cause of FSGS in these Miniature Schnauzer dogs has yet to be determined, but contributors likely include genetic podocytopathy, lipid abnormalities, and glomerular hypertension.
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Affiliation(s)
- Wilson Yau
- 1 Department of Pathology, College of Veterinary Medicine, University of Georgia, Athens, GA, USA
| | | | - Meryl P Littman
- 3 Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Rachel E Cianciolo
- 4 Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH, USA
| | - Cathy A Brown
- 1 Department of Pathology, College of Veterinary Medicine, University of Georgia, Athens, GA, USA.,5 Athens Veterinary Diagnostic Laboratory, College of Veterinary Medicine, University of Georgia, Athens, GA, USA
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29
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Aresu L, Martini V, Benali SL, Brovida C, Cianciolo RE, Dalla Riva R, Trez D, Van Der Lugt JJ, Van Dongen A, Zini E. European Veterinary Renal Pathology Service: A Survey Over a 7-Year Period (2008-2015). J Vet Intern Med 2017; 31:1459-1468. [PMID: 28763127 PMCID: PMC5598877 DOI: 10.1111/jvim.14796] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 03/21/2017] [Accepted: 06/27/2017] [Indexed: 12/21/2022] Open
Abstract
Background The European Veterinary Renal Pathology Service (EVRPS) is the first Web‐based registry for canine renal biopsy specimens in Europe. Hypothesis/Objectives The aim was to verify whether differences exist between the clinical and laboratory presentation of dogs with nephropathy according to renal pathological findings, as defined by light and electron microscopy of renal biopsy specimens submitted to EVRPS. Animals Renal biopsy specimens of dogs were collected from the archive of the service (n = 254). Cases were included if both light and electron microscopy were available (n = 162). Methods Renal biopsy specimens were classified based on the morphological diagnoses. Thereafter, they were grouped into 3 disease categories, including immune‐complex‐mediated glomerulonephritis (ICGN), non‐immune‐complex‐mediated GN (non‐ICGN), and renal lesions not otherwise specified (RL‐NOS). Differences among morphological diagnoses and among disease categories were investigated for clinical and laboratory variables. Results Serum albumin concentration was lower in dogs with ICGN than in those with non‐ICGN (P = 0.006) or RL‐NOS (P = 0.000), and the urine protein‐to‐creatinine ratio (UPC) was significantly higher in ICGN than in the other 2 disease categories. Regarding morphological diagnoses, albumin was significantly lower in amyloidosis (AMY) and membranous (MGN), membranoproliferative (MPGN) or mixed glomerulonephritis (MixGN) than in minimal change disease, primary (FSGS I) or secondary (FSGS II) focal and segmental glomerulosclerosis and juvenile nephropathies (JN). The UPC was higher in MPGN than in FSGS I and FSGS II. Conclusions and clinical importance Dogs with ICGN, in particular MPGN, had higher protein loss than those with non‐ICGN or RL‐NOS, leading to more severe hypoalbuminemia. Clinical and laboratory differentiation among dogs with the different morphological diagnoses and among dogs with different disease categories was difficult due to overlapping results.
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Affiliation(s)
- L Aresu
- Department of Comparative Biomedicine and Food Science, University of Padova, Agripolis Legnaro, PD, Italy
| | - V Martini
- Dipartimento di Medicina Veterinaria, Università degli Studi di Milano, Milano, Italy
| | - S L Benali
- La Vallonea Laboratory, Alessano, Le, Italy
| | - C Brovida
- Ospedale Veterinario ANUBI Strada Genova, Moncalieri, Italy
| | - R E Cianciolo
- Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH
| | - R Dalla Riva
- Department of Comparative Biomedicine and Food Science, University of Padova, Agripolis Legnaro, PD, Italy
| | - D Trez
- Department of Comparative Biomedicine and Food Science, University of Padova, Agripolis Legnaro, PD, Italy
| | | | - A Van Dongen
- Department of Clinical Sciences of Companion Animals, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
| | - E Zini
- Clinic for Small Animal Internal Medicine, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland.,Department of Animal Medicine, Production and Health, University of Padova, Legnaro, PD, Italy.,and Istituto Veterinario di Novara, Granozzo con Monticello, NO, Italy
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30
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Kohnken RA, Amerman H, Brown CA, Furrow E, Lees GE, Cianciolo RE. Glomerular Lipidosis in Dogs. Vet Pathol 2017; 54:795-801. [PMID: 28578625 DOI: 10.1177/0300985817709889] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Glomerular lipidosis (GL) is characterized by dilated glomerular capillary loops containing lipid-laden cells (foam cells). Previously, GL was considered to be an incidental finding because affected dogs were typically not azotemic. However, the International Renal Interest Society staging system for canine chronic kidney disease has increased the awareness of other clinical parameters (eg, proteinuria and hypertension) that should be included in the assessment of renal function. As such, the aim of this study was to determine clinical abnormalities and concurrent renal lesions in dogs with GL. GL was identified in renal biopsies from 46 dogs evaluated by the International Veterinary Renal Pathology Service. GL was the sole diagnosis in 5 of 46 cases (11%), all of which were proteinuric. All 5 dogs had at least 1 additional clinicopathologic abnormality consistent with renal disease, including hypertension (4), azotemia (3), and/or hypoalbuminemia (2). The remaining 41 dogs had GL in combination with other glomerular lesions, the most common being focal segmental glomerulosclerosis (16, 35%), lesions consistent with juvenile nephropathy (8, 17%), and glomerular amyloidosis (5, 11%). Overall, dogs with severe GL were younger than were those with mild GL ( P < .001). The percentage of glomeruli affected by GL differed by concurrent diagnoses ( P = .034), with the highest percentage of affected glomeruli in dogs with GL alone or those with concurrent juvenile nephropathy. These findings suggest that GL should be a recognized histologic phenotype of glomerular injury associated with clinical renal dysfunction and/or juvenile nephropathies.
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Affiliation(s)
- Rebecca A Kohnken
- 1 Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH
| | - Hayley Amerman
- 1 Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH
| | - Cathy A Brown
- 2 Athens Veterinary Diagnostic Laboratory, College of Veterinary Medicine, University of Georgia, Athens, GA
| | - Eva Furrow
- 3 Department of Veterinary Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, MN
| | - George E Lees
- 4 Department of Small Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX
| | - Rachel E Cianciolo
- 1 Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH
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31
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Furrow E, Lees GE, Brown CA, Cianciolo RE. Glomerular Lesions in Proteinuric Miniature Schnauzer Dogs. Vet Pathol 2016; 54:484-489. [PMID: 28005494 DOI: 10.1177/0300985816681412] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Miniature Schnauzer dogs are predisposed to idiopathic hypertriglyerceridemia, which increases risk for diseases such as pancreatitis and gallbladder mucocele. Recently, elevated triglyceride concentrations have been associated with proteinuria in this breed, although it is difficult to determine which abnormality is primary. Retrospective review of renal tissue from 27 proteinuric Miniature Schnauzers revealed that 20 dogs had ultrastructural evidence of osmophilic globules consistent with lipid in glomerular tufts. Seven of these dogs had lipid thromboemboli in glomerular capillary loops that distorted their shape and compressed circulating erythrocytes. Triglyceride concentrations were reported in 6 of these 7 dogs, and all were hypertriglyceridemic. In addition, glomerular lipidosis (defined as accumulation of foam cells within peripheral capillary loops) was identified in a single dog. The remaining 12 dogs had smaller amounts of lipid that could only be identified ultrastructurally. Neither signalment data nor clinicopathologic parameters (serum albumin, serum creatinine, urine protein-to-creatinine ratio, and blood pressure) differed among the various types of lipid lesions. During the time course of this study, all dogs diagnosed with glomerular lipid thromboemboli were Miniature Schnauzers, underscoring the importance of recognizing these clear spaces within capillary loops as lipid.
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Affiliation(s)
- E Furrow
- 1 Department of Veterinary Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, Minneapolis, MN, USA
| | - G E Lees
- 2 Department of Small Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX, USA
| | - C A Brown
- 3 Athens Veterinary Diagnostic Laboratory, College of Veterinary Medicine, University of Georgia, Athens, GA, USA
| | - R E Cianciolo
- 4 Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH, USA
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32
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Crivellenti LZ, Silva GEB, Borin-Crivellenti S, Cianciolo R, Adin CA, Dantas M, dos Anjos DS, Tinucci-Costa M, Santana AE. Prevalence of Glomerulopathies in Canine Mammary Carcinoma. PLoS One 2016; 11:e0164479. [PMID: 27764139 PMCID: PMC5072677 DOI: 10.1371/journal.pone.0164479] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Accepted: 09/25/2016] [Indexed: 12/22/2022] Open
Abstract
The incidence and prevalence of paraneoplastic glomerulopathy, especially associated with carcinoma, are a matter of debate and the causal link between cancer and glomerular diseases remains unclear. The aim of this study was to evaluate renal biopsies of selected bitches with spontaneous mammary gland carcinoma. We hypothesized that dogs with mammary carcinomas would show histologic evidence of glomerular pathology. A prospective study was performed in dogs with naturally occurring mammary carcinoma that were undergoing tumor resection and ovariohysterectomy. We evaluated renal biopsies of 32 bitches with spontaneous mammary gland carcinoma and 11 control dogs without mammary gland neoplasia. Samples were obtained from the left kidney and the biopsy material was divided for light microscopy (LM), immunofluorescence (IF) and transmission electron microscopy (TEM). Light microscopy abnormalities were identified in 78.1% of dogs with mammary carcinoma (n = 25) and in none of the dogs in the control group. Focal glomerular mesangial matrix expansion was the most common alteration (n = 15, 60.0%), but mesangial cell proliferation (n = 9, 36.0%) and focal segmental glomerulosclerosis (n = 9, 36.0%), synechiae (n = 7, 28.0%), and globally sclerotic glomeruli (n = 6, 24.0%) were also frequent in dogs with malignancy. Immunofluorescence microscopy revealed strong IgM staining was demonstrated in 64.3% (n = 18) of carcinoma dogs. Transmission electron microscopy from dogs with carcinoma revealed slight changes, the most frequent of which was faint sub-endothelial and mesangial deposits of electron-dense material (78%). Mesangial cell interpositioning and segmental effacement of podocyte foot processes were identified in some specimens (45%). Changes in the glomerulus and proteinuria are common in dogs with naturally occurring mammary carcinoma and this condition appears to provide an excellent large animal model for cancer-associated glomerulopathy in humans.
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Affiliation(s)
- Leandro Z. Crivellenti
- Department of Veterinary Clinic and Surgery, Franca University (UNIFRAN), Franca, Brazil
- Department of Veterinary Clinic and Surgery, São Paulo State University (UNESP), Jaboticabal, Brazil
- Department of Renal Pathology, Faculty of Medicine of Ribeirão Preto, Universidade do Estado de São Paulo (USP), São Paulo, Brazil
- * E-mail:
| | - Gyl E. B. Silva
- Department of Renal Pathology, Faculty of Medicine of Ribeirão Preto, Universidade do Estado de São Paulo (USP), São Paulo, Brazil
| | - Sofia Borin-Crivellenti
- Department of Veterinary Clinic and Surgery, São Paulo State University (UNESP), Jaboticabal, Brazil
| | - Rachel Cianciolo
- Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, United States of America
| | - Christopher A. Adin
- Department of Clinical Sciences, College of Veterinary Medicine, NC State University, Raleigh, United States of America
| | - Márcio Dantas
- Department of Internal Medicine (Division of Nephrology), Faculty of Medicine of Ribeirão Preto, Universidade do Estado de São Paulo (USP), São Paulo, Brazil
| | - Denner S. dos Anjos
- Department of Veterinary Clinic and Surgery, Franca University (UNIFRAN), Franca, Brazil
| | - Mirela Tinucci-Costa
- Department of Veterinary Clinic and Surgery, São Paulo State University (UNESP), Jaboticabal, Brazil
| | - Aureo E. Santana
- Department of Veterinary Clinic and Surgery, São Paulo State University (UNESP), Jaboticabal, Brazil
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Abstract
According to previous studies in captive cheetah ( Acinonyx jubatus ) populations, one of the most threatening diseases besides amyloidosis, myelopathy, veno occlusive disease, and gastritis, is renal failure. Contrary to captive cheetahs in North America and South Africa, morphological data concerning renal lesions in the cheetah European Endangered Species Program (EEP) are lacking. This study details the histological characterization as well as immunohistochemical and morphometrical analysis of nephropathies in 35 captive cheetahs from the EEP, which were necropsied between 1985 and 2003. Examination of paraffin- and glycolmethacrylate-methylmethacrylate (GMA-MMA) embedded kidney samples by light microscopy revealed glomerulonephritis in 91%, with a high prevalence for glomerulosclerosis and glomerulonephritis with the histologic pattern of membranous glomerulonephritis (77%). Besides these predominating glomerulopathies, a wide range of other renal lesions, like acute tubular necrosis, interstitial nephritis, calcinosis, and amyloidosis, were present. Pathological expression of collagen type IV, complement C3, fibronectin, and IgG was demonstrated in the glomeruli of the cheetah kidneys with the use of the avidin-biotin complex method. Morphometrical analysis was performed on GMA-MMA embedded kidney samples to obtain glomerulosclerosis index and glomerulosclerosis incidence.
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Cianciolo R, Hokamp J, Nabity M. Advances in the evaluation of canine renal disease. Vet J 2016; 215:21-9. [PMID: 27198066 DOI: 10.1016/j.tvjl.2016.04.012] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Revised: 04/05/2016] [Accepted: 04/23/2016] [Indexed: 01/11/2023]
Abstract
Many recent advances in the evaluation of dogs with kidney disease have improved our diagnostic algorithms and have impacted our therapeutic strategies. Non-invasive techniques, such as urinary and serologic biomarker evaluation, can help a clinician diagnose and treat a patient that cannot undergo a renal biopsy for clinical or financial reasons. Some biomarkers might help localize the affected structure (glomerulus vs. tubule) and indicate the type or severity of injury present. Although more research is needed, studies indicate that some biomarkers (e.g. urine protein to creatinine ratio and urinary immunoglobulins) can be useful in predicting adverse outcomes. Importantly, the sensitivity and specificity of biomarkers for renal injury should be established and clinicians need to understand the limitations of these assays. If a renal biopsy is performed, then it should be evaluated by a specialty diagnostic service with expertise in nephropathology. A panel of special stains, immunofluorescence for the detection of immunoglobulins and complement factors, and transmission electron microscopy can be routinely employed in cases of glomerular disease. These advanced diagnostics can be used to detect immune deposits in order to definitively diagnose immune complex mediated glomerular disease. Integrating the results of biomarker assays and comprehensive renal biopsy evaluation, the clinician can make informed therapeutic decisions, such as whether or not to immunosuppress a patient.
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Affiliation(s)
- Rachel Cianciolo
- Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210, USA.
| | - Jessica Hokamp
- Department of Veterinary Pathobiology, College of Veterinary Medicine, Texas A&M University, College Station, TX, USA
| | - Mary Nabity
- Department of Veterinary Pathobiology, College of Veterinary Medicine, Texas A&M University, College Station, TX, USA
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Sugahara G, Kamiie J, Kobayashi R, Mineshige T, Shirota K. Expression of phospholipase A2 receptor in primary cultured podocytes derived from dog kidneys. J Vet Med Sci 2016; 78:895-9. [PMID: 26854253 PMCID: PMC4905851 DOI: 10.1292/jvms.15-0722] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Phospholipase A2 receptor (PLA2R) expressed in human podocytes has been
highlighted as a causative autoantigen of human idiopathic membranous nephropathy.
However, its expression was found to be minimal or absent in murine and rat podocytes. In
this study, immunofluorescence revealed the expression of PLA2R in the
glomerular podocytes in the kidney tissue sections of dogs. We then attempted to culture
canine podocytes and investigate the expression of PLA2R in these cells.
Glomeruli were isolated from dog kidneys and cultured to obtain podocytes using nylon
mesh-based isolation method as followed for isolating rat podocytes. The cultured cells
expressed PLA2R mRNA and protein in addition to other podocyte markers
(synaptopodin, podocin and nephrin). These results indicate that the canine podocytes
express PLA2R.
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Affiliation(s)
- Go Sugahara
- Laboratory of Veterinary Pathology, School of Veterinary Medicine, Azabu University, 1-17-71 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5201, Japan
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Hokamp JA, Cianciolo RE, Boggess M, Lees GE, Benali SL, Kovarsky M, Nabity MB. Correlation of Urine and Serum Biomarkers with Renal Damage and Survival in Dogs with Naturally Occurring Proteinuric Chronic Kidney Disease. J Vet Intern Med 2016; 30:591-601. [PMID: 26833584 PMCID: PMC4913609 DOI: 10.1111/jvim.13832] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Revised: 09/06/2015] [Accepted: 12/29/2015] [Indexed: 01/11/2023] Open
Abstract
Background Urine protein loss is common in dogs with chronic kidney disease (CKD). Hypothesis/Objectives To evaluate new biomarkers of glomerular and tubulointerstitial (TI) damage compared with histology and as survival indicators in dogs with naturally occurring, proteinuric CKD. Animals One hunderd and eighty dogs with naturally occurring kidney disease. Methods Retrospective study using urine, serum, and renal biopsies from dogs with kidney disease, 91% of which had proteinuric CKD. Biomarkers were evaluated and correlated with pathologic renal damage, and significant associations, sensitivities, and specificities of biomarkers for renal disease type were determined. Results Fractional excretions of immunogloblin M (IgM_FE) and immunoglobulin G (IgG_FE) correlated most strongly with glomerular damage based on light microscopy (r = 0.58 and 0.56, respectively; P < .01). Serum creatinine (SCr) correlated most strongly with TI damage (r = 0.70, P < .01). Urine IgM/creatinine and urine NAG/creatinine had the highest sensitivity (75%) and specificity (78%) for detection of immune complex‐mediated glomerulonephritis. Although individually most biomarkers were significantly associated with decreased survival time (P < .05), in a multivariate analysis, SCr, IgM_FE, and glomerular damage based on transmission electron microscopy (TEM) were the only biomarkers significantly associated with survival time (SCr: P = .001; IgM_FE: P = .008; TEM: P = .017). Conclusions and Clinical Importance Novel urine biomarkers and FEs are useful for detection of glomerular and TI damage in dogs with proteinuric CKD and might predict specific disease types and survival.
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Affiliation(s)
- J A Hokamp
- Department of Veterinary Pathobiology, Texas A&M University College of Veterinary Medicine and Biomedical Sciences, College Station, TX
| | - R E Cianciolo
- Department of Veterinary Biosciences, The Ohio State University, Columbus, OH
| | - M Boggess
- School of Mathematical and Statistical Sciences, Arizona State University, Tempe, AZ
| | - G E Lees
- Department of Small Animal Clinical Sciences, Texas A&M University College of Veterinary Medicine and Biomedical Sciences, College Station, TX
| | - S L Benali
- Dipartimento di Sanità Pubblica, Patologia Comparata e Igiene Veterinaria, Facoltà di Medicina Veterinaria, Viale dell'Università, Padua, Italy
| | - M Kovarsky
- Department of Veterinary Pathobiology, Texas A&M University College of Veterinary Medicine and Biomedical Sciences, College Station, TX
| | - M B Nabity
- Department of Veterinary Pathobiology, Texas A&M University College of Veterinary Medicine and Biomedical Sciences, College Station, TX
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