Expression of vascular endothelial growth factor in dogs with Spirocerca lupi-associated neoplastic transformation

Tumour development is dependent upon the formation of an adequate blood supply through angiogenesis. Vascular endothelial growth factor (VEGF) is one of the most potent and specific pro-angiogenic factors associated with tumour development. Vascular endothelial growth factor is elevated in dogs with a variety of neoplastic tumours and has been linked to an increased risk for metastasis and a poorer prognosis in several tumours. Spirocerca lupi (S. lupi) is a nematode of canids which infests the oesophagus where it forms a nodule. The oesophageal nodule can develop into a neoplastic tumour namely osteosarcoma, fibrosarcoma or anaplastic sarcoma. The pathogenesis of the neoplastic transformation is poorly understood. Diagnosis of neoplastic transformation can be challenging and is based on endoscopy-guided biopsies which are invasive, expensive and may yield non diagnostic samples. The aim of this prospective study was to determine if serum and plasma VEGF levels could be used to distinguish between neoplastic and non-neoplastic spirocercosis. Twenty four dogs were enrolled in the study, 9 with non-neoplastic, 9 with neoplastic spirocercosis, and 6 control dogs. Plasma and serum samples for VEGF analysis were collected at diagnosis. Measurement of VEGF was done using a canine VEGF Quantikine ELISA kit. Statistical analysis to compare the means of the VEGF concentrations between the groups was performed using the Kruskal-Wallis followed by the Dunn’s test. Significance was set at p<0.05 The median plasma VEGF concentration of the dogs with neoplastic spirocercosis 629pg/ml (range 282 – 2366) was higher than the median plasma VEGF concentrations of both the non-neoplastic 0pg/ml (range 0 – 716) and controls 0pg/ml (range 0 – 0) (p<0.001). The median serum VEGF concentration of the neoplastic dogs 69pg/ml (range 0 – 212) was higher than the serum VEGF concentrations in the non-neoplastic 0pg/ml (range 0 – 44.13) and control 0pg/ml (range 0 – 39.4) (p=0.001). Plasma VEGF at a cut off value of 250pg/ml was determined to have a sensitivity of 100%, specificity of 77.8%, a PPV of 81.8% and a NPV of 100% for determining neoplastic transformation. Serum VEGF at a cut off value of 25pg/ml was determined to have a sensitivity of 88.9%, specificity of 100%, a PPV of 100% and a NPV of 90% for determining neoplastic transformation. Both plasma and serum VEGF concentrations can be used to differentiate between non-neoplastic and neoplastic spirocercosis. Plasma VEGF concentrations were higher than serum VEGF concentrations, contrary to what is reported in literature. Both plasma and serum VEGF concentrations can, therefore, potentially be used for diagnosis of neoplastic vs. non-neoplastic cases in canine spirocercosis. There is a need to perform more studies to determine cut-off concentrations that would maximize the sensitivity and specificity for determining neoplastic transformation in canine spirocercosis as well as to determine the role of VEGF in the pathogenesis of the neoplastic transformation. CopyrightDissertation (MMedVet)--University of Pretoria, 2012.Companion Animal Clinical Studiesunrestricte

Serum C-reactive protein concentration in benign and malignant canine spirocercosis

BACKGROUND: Spirocerca lupi is a nematode of canids that forms a nodule in the esophagus that can undergo neoplastic transformation. C-reactive protein (CRP) is a major acute phase protein in the dog that has been used for treatment, monitoring, and prognostication in inflammatory and neoplastic disease. HYPOTHESIS/OBJECTIVES: The objectives of this study were to determine if serum CRP concentration (1) is increased in canine spirocercosis, (2) can be used to determine neoplastic transformation, and (3) can be used to monitor response to treatment in benign spirocercosis. ANIMALS: Forty-two dogs naturally infected with S. lupi and 21 control dogs. METHODS: A retrospective study was performed. The infected cases were divided into benign (n = 28) or malignant (n = 14) spirocercosis. CRP was performed on all of the spirocercosis and control cases at presentation. Statistical analysis was done by the one-way analysis of variance and Student’s t-test. RESULTS: The mean CRP concentration in the benign cases was 60.4 ± 48.0 mg/L and that of the malignant cases was 76.5 ± 44.8 mg/L; both values were significantly higher (P < .001) than those of the control group where the mean was 13.4 ± 17.9 mg/L. The mean CRP concentration for the convalescent sera in the benign group was lower than the pretreatment concentrations (P = .01). CONCLUSION AND CLINICAL IMPORTANCE: CRP cannot be used to differentiate between benign and malignant spirocercosis. There is a decrease in CRP concentration in dogs with benign spirocercosis once treatment has commenced. Serial CRP measurement can be used to monitor response to treatment in benign spirocercosis.The Department of Companion Animal Clinical Studies at the Faculty of Veterinary Science, University of Pretoria.http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1939-1676mn201

Serum alkaline phosphatase activity is not a marker for neoplastic transformation of esophageal nodules in canine spirocercosis

BACKGROUND: Spirocerca lupi is a nematode of Canidae that matures within the esophageal wall to form fibroblastic nodules with potential for malignant transformation. Diagnosis is based on histopathologic examination, but false-negative results may be obtained from samples collected by endoscopy. Serum alkaline phosphatase (ALP) activity, frequently increased in hepatobiliary disease, is also increased in a variety of neoplastic conditions in dogs, including appendicular osteosarcoma, and has also been reported to be increased in dogs with spirocercosis. OBJECTIVE: The aim of this study was to evaluate serum ALP activity as a marker for malignant transformation of esophageal nodules in S. lupi-infected dogs. METHODS: In this retrospective study, medical records of dogs diagnosed with spirocercosis from 1991 to 2008 were reviewed, and serum ALP activity determined at presentation was compared between dogs with nonneoplastic and neoplastic nodules. Owing to use of multiple analyzers, ratios of ALP activity to the upper reference interval for ALP were calculated and compared. RESULTS: Median ALP activity ratios were 0.65 (0.07–4.00) and 0.86 (0.10–3.40) for dogs with nonneoplastic (n = 88) and neoplastic (n=32) nodules, respectively,with no significant difference (P =.18) and substantial overlap between groups. Tumors included osteosarcoma (15 dogs), fibrosarcoma (15 dogs), and anaplastic sarcoma (2 dogs); there was no difference in ALP activity between the dogs with osteosarcoma and fibrosarcoma. CONCLUSION: ALP is a poor marker of malignant transformation in canine spirocercosis.http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1939-165X/issue

The dataset for the inflammatory response during experimental infection and treatment of dogs with Babesia rossi

Babesia rossi causes severe morbidity and mortality in dogs in sub-Saharan Africa. This was an experimental study designed to observe systemic changes caused by Babesia rossi infection within a canine disease model as well as investigate the influence of inoculum dose and treatment on the progression of inflammation and clinical disease. Six healthy male beagle dogs formed the study population, one dog was splenectomised and used to raise the infectious inoculum, three were administered a high B. rossi infectious dose and two a low infectious dose. Clinical examination, complete blood count (CBC) and C-reactive protein (CRP) were determined daily. Cytokines were quantified on stored plasma collected during the study, using a canine specific cytokine magnetic bead panel (Milliplex©). The experiment was terminated, and treatment administered once predetermined experimental or humane endpoints were reached. The data and information provided in the following article is the summary of all dataThe National Research Foundation.https://www.journals.elsevier.com/data-in-brief/dm2022Companion Animal Clinical StudiesProduction Animal Studie

Kinetics of the inflammatory response during experimental Babesia rossi infection of beagle dogs

Referred to by: The dataset for the inflammatory response during experimental infection and treatment of dogs with Babesia rossi. Data in Brief, Volume 45, December 2022, Pages 108475. Brogan Kim Atkinson, Peter Thompson, Estee Van Zyl, Amelia Goddard, Yolandi Rautenbach, Johan Petrus Schoeman, Varaidzo Mukorera, Andrew Leisewitz. (https://repository.up.ac.za/handle/2263/88078)Babesia rossi causes severe morbidity and mortality in dogs in sub-Saharan Africa, and the complications associated with this disease are likely caused by an unfocused, excessive inflammatory response. During this experimental B. rossi study we investigated inflammatory marker and cytokine kinetics during infection and after treatment. We aimed to determine whether infectious dose and treatment would influence the progression of the inflammatory response and clinical disease. Six healthy male beagle dogs formed the study population, one was used to raise the infectious inoculum, three were administered a high B. rossi infectious dose (HD group) and two a low infectious dose (LD group). Clinical examination, complete blood count (CBC) and C-reactive protein (CRP) were determined daily. Cytokines were quantified on stored plasma collected during the study, using a canine specific cytokine magnetic bead panel (Milliplex©). The experiment was terminated and treatment administered when predetermined experimental or humane endpoints were reached. Parasitemia occurred on day 1 and 3 in the HD and LD groups respectively. The rate of increase in parasitemia in the HD group was significantly faster than that seen in the LD group. Significant differences were found in heart rate, blood pressure, interferon gamma (INFγ), keratinocyte chemoattractant (KC), INFγ-induced protein 10 (IP10), granulocyte-macrophage colony-stimulating factor (GM-CSF), monocyte chemoattractant protein 1 (MCP1), tumor necrosis factor alpha (TNFα), interleukin 2 (IL-2), IL-6, IL-7, IL-8, IL-10 IL-15, IL-18, CRP, neutrophils and monocytes between groups at multiple time points during the course of the infection. Our findings suggest that the initiation of inflammation occurs before the onset of clinical disease in B. rossi infection and infectious dose influences the onset of the inflammatory response. Treatment enhances the inflammatory response in the immediate post-treatment period which may contribute to disease associated complications. Finally, we found that there is an imbalance in pro/anti-inflammatory cytokine concentrations during infection which may promote parasite replicationThe National Research Foundation South Africa.https://www.elsevier.com/locate/vetpar2023-05-30hj2023Companion Animal Clinical StudiesProduction Animal Studie

Septic pericarditis and pneumopericardium in a dog with an oesophageal foreign body

A 5-year-old, intact, male Yorkshire Terrier presented with a 6-day history of lethargy and anorexia. Clinical examination revealed dental plaque accumulation, abdominal effort during respiration and muffled heart sounds. Thoracic radiographs revealed an enlarged globoid cardiac silhouette and mild pneumopericardium, transthoracic ultrasonography revealed a pericardial effusion after which pericardiocentesis, cytology and culture diagnosed septic pericarditis. Three multidrug-resistant bacteria were isolated, two of which have been implicated in gas-producing infections before. Medical management failed to resolve the pericarditis and euthanasia was opted for. A chronic osseocartilaginous oesophageal foreign body cranial to the heart base was found on necropsy. Septic pericarditis and pneumopericardium are rare conditions in dogs. This is the first case to describe a multidrug-resistant polybacterial aetiology causing mild pneumopericardium and only the second case to describe septic pericarditis associated with an oesophageal foreign body.http://www.jsava.co.zaam2017Companion Animal Clinical Studie

Vascular endothelial growth factor concentrations in dogs with Spirocercosis

BACKGROUND : Vascular endothelial growth factor (VEGF) is a potent proangiogenic factor associated with tumor development.Spirocerca lupi is a nematode of canids that induces an esophageal nodule that progresses to a sarcoma in 25% of cases. Determination of neoplastic transformation is challenging and usually based on endoscopy-guided biopsies under general anesthesia, an expensive procedure that often yields nondiagnostic, necrotic samples. HYPOTHESIS : Circulatory VEGF concentrations are increased in dogs with neoplastic spirocercosis and can distinguish between dogs with neoplastic and nonneoplastic disease. ANIMALS : A total of 24 client-owned dogs, 9 nonneoplastic, 9 neoplastic, and 6 controls. METHODS : Case-control study. Plasma and serum VEGF concentrations at the time of diagnosis were compared with those of healthy controls. Measurement of VEGF was performed using a canine-specific ELISA. Kruskal-Wallis and Dunn’s tests were used for statistical analysis with significance set at P < .05. RESULTS : The median plasma VEGF concentrations of dogs with neoplastic spirocercosis were 629 pg/mL (range, 282– 2,366) higher than both the nonneoplastic (<39.5 pg/mL; range, <39.5–716) and control dogs (<39.5 pg/mL; all values, <39.5; P = .0003). The median serum VEGF concentration of the neoplastic dogs was 69 pg/mL (range, <39.5–212) higher than the nonneoplastic (<39.5 pg/mL; range, <39.5–44.13) and control dogs (<39.5 pg/mL; all values, <39.5; P = .001). CONCLUSIONS AND CLINICAL IMPORTANCE : Both plasma and serum VEGF concentrations can be used to differentiate nonneoplastic and neoplastic spirocercosis. The role of VEGF in neoplastic transformation of S. lupi-induced nodules and the potential utility of anti-VEGF drugs in spirocercosis-induced sarcoma warrant further investigation.South African National Research Foundation and the Faculty of Veterinary Science, University of Pretoria, South Africa.http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1939-1676hb2014mn201