In the present study, the use of dogs with experimental autoimmune encephalomyelitis (EAE) as a disease model for necrotizing encephalitis (NE) was assessed. Twelve healthy dogs were included in this study. Canine forebrain tissues (8 g), including white and grey matter, were homogenized with 4 mL of phosphate-buffered saline for 5 min in an ice bath. The suspension was emulsified with the same volume of Freund's complete adjuvant containing 1 mg/mL of killed Mycobacterium tuberculosis H37Ra. Under sedation, each dog was injected subcutaneously with canine brain homogenate at four sites: two in the inguinal and two in the axillary regions. A second injection (booster) was administered to all the dogs using the same procedure 7 days after the first injection. Clinical assessment, magnetic resonance imaging, cerebrospinal fluid analyses, necropsies, and histopathological and immunohistochemical examinations were performed for the dogs with EAE. Out of the 12 animals, seven (58%) developed clinically manifest EAE at various times after immunization. Characteristics of canine EAE models were very similar to canine NE, suggesting that canine EAE can be a disease model for NE in dogs.
Animals ; Brain/*pathology ; Disease Models, Animal ; Dog Diseases/*immunology ; Dogs ; Encephalitis/immunology/*veterinary ; Encephalomyelitis, Autoimmune, Experimental/immunology/*veterinary ; Female ; Fluorescent Antibody Technique/veterinary ; Immunization/veterinary ; Immunohistochemistry/veterinary ; Magnetic Resonance Imaging/veterinary ; Male ; Necrosis/immunology/*veterinary

We describe 2 cases of malignant fibrous histiocytomas (MFHs) that spontaneously developed in young pet dogs. To classify these tumors, we applied a panel of antibodies (vimentin, desmin, alpha-SMA, and ED1) and Azan staining for collagen. The MFHs were most consistent with osteoclast-like giant and inflammatory cell types. The first case had positive staining for ED1 and vimentin, and given the osteoclast-like giant cells, calcification sites accompanying peripheral giant cell infiltrates. The latter case, the inflammatory cell type, exhibited a storiform-pleomorphic variant of neoplastic cells, including an ossifying matrix. MFHs are among the most highly aggressive tumors occurring in soft tissue sarcomas in elderly dogs; however, MFHs have been poorly studied from a diagnostic point of view. Herein, we describe the histologic and immunohistologic features of MFHs in detail, thus classifying the subtypes of these tumors.
Animals ; Biopsy/veterinary ; Dog Diseases/diagnosis/*pathology ; Dogs ; Female ; Histiocytoma, Malignant Fibrous/diagnosis/pathology/*veterinary ; Immunohistochemistry/veterinary ; Male ; Soft Tissue Neoplasms/diagnosis/pathology/*veterinary

A 5-year-old, male French bulldog with bradycardia, dyspnea, and decerebrate rigidity was necropsied. Macroscopic findings were restricted to the brain, and a single mass, 1.5x2.0x1.5 cm in size, was observed mainly at the right cingulum with prominently protruding into the dilated right lateral ventricle. The mass was grayish white in color, soft and gelatinous, but not clearly delineated. Microscopically, the mass consisted of diffuse proliferated neoplastic oligodendroglial cells characterized by small, round, and hyperchromatic nuclei with clear cytoplasm and the cells aggressively invaded into the adjacent parenchyma. Immunohistochemistry demonstrated that most of the neoplastic cells were positive for S-100 protein, vimentin, neuron specific enolase (NSE), and neurofilament protein (NFP). From these findings, the mass was diagnosed as oligodendroglioma.
Animals ; Cerebral Ventricle Neoplasms/pathology/*veterinary ; Dog Diseases/*pathology ; Dogs ; Immunohistochemistry ; Male ; Nerve Tissue Proteins/analysis ; Oligodendroglioma/pathology/*veterinary

Over the 42 month period from January 2003 to June2006, a total of 2,952 canine biopsy specimens werereceived from the Veterinary Medical Teaching Hospitalof Seoul National University and from veterinary practitionersacross the nation. Out of these, 748 (25.34%) cases werediagnosed as canine cutaneous tumors in the Departmentof Veterinary Pathology, College of Veterinary Medicine,Seoul National University, Korea. Thirty-eight differenttypes of cutaneous tumors were identified and categorizedinto epithelial and melanocytic tumors (56.95%), mesenchymaltumors (38.90%), and hematopoietic tumors (4.14%)located in the skin. Among these, 69.25% were benign and30.74% were malignant. The top ten most frequentlydiagnosed cutaneous tumors were epidermal and follicularcysts (12.70%), lipoma (11.36%), mast cell tumors (8.82%),cutaneous histiocytoma (7.49%), basal cell tumors (6.82%),sebaceous gland adenoma (6.68%), sebaceous glandhyperplasia (5.08%), hepatoid gland adenoma (3.61%),apocrine adenocarcinoma (3.07%), and fibroma (2.81%),in order of prevalence. They comprised 68.45% of allcutaneous tumors. These top ten cutaneous tumors weredistributed on the trunk (30.08%), head and neck(20.9%), extremities (19.14%), anal and perianal area(8.59%), and tail (3.91%). The age of the dogs with the tenmost frequent tumors had a mean age of 8.3 years, with arange of 2 months to 19 years. When all types of tumorswere considered together in the entire population, therewas no difference in incidence according to sex.
Animals ; Biopsy/veterinary ; Dog Diseases/epidemiology/*pathology ; Dogs ; Female ; Immunohistochemistry/veterinary ; Korea/epidemiology ; Male ; Prevalence ; Retrospective Studies ; Skin Neoplasms/epidemiology/pathology/*veterinary

Equine endometriosis is a multifactorial disease considered to be a major cause of equine infertility. The purpose of this study was to evaluate the reliability of histomorphological grading for biopsy-like samples compared to entire uterine wall samples, to examine the association between the degree of endometriosis with animal age, and to investigate the role of inflammation in endometriosis and the expression of different matrix metalloproteinases in equine endometrium. Histomorphological lesions in 35 uterine samples were examined while comparing biopsy-like samples and entire-wall samples. Seventeen uterine samples were stained with antibodies against MMP-2, MMP-9, MMP-14, and TIMP-2. The morphologic evaluation results of the biopsy-like tissue and entire-wall samples were significantly correlated. Endometriosis in older mares (>12 years of age) was more severe than in young mares (2~4 years of age), confirming the positive correlation between animal age and disease severity, while inflammation was poorly related to the degree of endometriosis. MMP-2 and MMP-14 were detected in stromal cells, while MMP-9 and TIMP-2 were both found in stromal and glandular epithelial cells. There were no significant differences in MMPs expression between the two groups (young vs. old mares). Additional studies on the activity of MMPs could further define the role of these enzymes in equine endometriosis.
Animals ; Endometriosis/metabolism/pathology/*veterinary ; Female ; Gene Expression Regulation, Enzymologic/*physiology ; Horse Diseases/metabolism/*pathology ; Horses ; Immunohistochemistry/veterinary ; Inflammation/pathology/*veterinary ; Matrix Metalloproteinases/genetics/*metabolism ; Uterus/metabolism/pathology

A male, 5-year-old Jindo dog underwent enterectomy and enteroanastomosis due to ileus of the intestine at a local veterinary hospital. Grossly, the excised intestine showed markedly thickened multinodular masses in the serosal layer of the upper part, and soft-to-firm, creamcolored neoplastic masses that displayed extensive nodular mucosal protuberances into the lumen. The neoplastic masses were filled with large round cells that were ovoid in shape and they had pale and/or hyperchromatic nuclei. The neoplastic cells had mainly infiltrated into the mucosal and submucosal layers, and they had diffusely invaded the muscular and serosal layers. Therefore, the diagnosis of canine multiple intestinal malignant lymphomatous polyposis was made based on the gross and histopathological findings. The origin of these tumor cells was determined to be B-cells since they were positive for anti-CD20.
Animals ; Antigens, CD20/metabolism ; Dog Diseases/*pathology/surgery ; Dogs ; Immunohistochemistry/veterinary ; Intestinal Neoplasms/pathology/surgery/*veterinary ; Intestinal Polyps/*pathology/surgery ; Lymphoma, Mantle-Cell/pathology/surgery/*veterinary ; Male

Primary testicular tumors are the most common causes of cancer in male dogs. Overall, the majority of canine patients should be cured by testicular surgery. However, tumor markers are not well-known in veterinary medicine. We sought to determine using immunohistochemistry whether the combined human testicular tumor markers (placental alkaline phosphatase, OCT3/4, CD30, alpha-fetoprotein, inhibin-alpha, vimentin, c-KIT, and desmin) are expressed in canine seminomas and Sertoli cell tumors (SCTs). We examined 35 canine testicular tumors, 20 seminomas and 15 SCTs. c-KIT was expressed markedly in canine seminomas. Both inhibin-alpha and vimentin were expressed significantly in canine SCTs. The results of this study demonstrate differences and similarities between tumor marker expression of testicular tumors in dogs and humans. All the main markers in current routine use are discussed as well as potential useful markers for benign and malignant tumors, and tumor progression.
Animals ; Dog Diseases/*pathology ; Dogs ; Immunohistochemistry/*veterinary ; Male ; Seminoma/metabolism/pathology/*veterinary ; Sertoli Cell Tumor/metabolism/pathology/*veterinary ; Tumor Markers, Biological/metabolism

Bovine spongiform encephalopathy (BSE), a member of the transmissible spongiform encepahlopathies, has been a notifiable disease in Turkey since 1997. In 2002, the BSE status of Turkey was assessed by the EU Scientific Steering Committee as "it is likely but not confirmed".This study presents the results of a targeted surveillance study to assess the presence of BSE in the age risk population of Bursa, Turkey. In the assessment procedure, the immunohistochemical detection of protease-resistant prion protein (PrP-Sc) was aimed at and applied to 420 brain tissues of cattle slaughtered in Bursa at an age of 30-months and older. None of the samples were positive for BSE.
Age Factors ; Animals ; Cattle ; Encephalopathy, Bovine Spongiform/*diagnosis/epidemiology ; Immunohistochemistry/veterinary ; Prions/*analysis ; Turkey/epidemiology

This report deals with the acute onset of an abortion outbreak and high sow mortality in one pig herd consisted of 1,200 pigs and 120 sows on Jeju Island, Korea. Affected pregnant sows showed clinical signs, including high fever, gradual anorexia, vomiting, depression, recumbency, prostration, abortion, and a few deaths. Four dead sows, five aborted fetuses from the same litter, and 17 sera collected from sows infected or normal were submitted to the Pathology Division of the National Veterinary Research and Quarantine Service for diagnostic investigation. Grossly, hepatomegaly and splenomegaly were observed in sows. Multiple necrotic foci were scattered in the lungs, liver, spleen, and lymph nodes. Microscopically, multifocal necrotizing lesions and protozoan tachyzoites were present in the lesions. Tachyzoites of Toxoplasma (T.) gondii were detected immunohistochemically. Latex agglutination showed that the sera of 7 of 17 (41.2%) sows were positive for antibody to T. gondii. The disease outbreak in this herd was diagnosed as epizootic toxoplasmosis. To our knowledge, this is the first report of porcine toxoplasmosis with a high abortion rate and sow mortality in Korea.
Aborted Fetus ; Abortion, Veterinary/blood/epidemiology/*parasitology/pathology ; Animals ; Antibodies, Protozoan/blood ; Disease Outbreaks/*veterinary ; Female ; Hepatomegaly/parasitology/veterinary ; Immunohistochemistry/veterinary ; Korea/epidemiology ; Latex Fixation Tests/veterinary ; Pregnancy ; Splenomegaly/parasitology/veterinary ; Swine ; Swine Diseases/blood/epidemiology/*parasitology/pathology ; Toxoplasma/*isolation & purification ; Toxoplasmosis, Animal/blood/epidemiology/parasitology/*pathology

The expression of osteopontin (OPN) in boar testis was studied. Western blot analysis detected 66- and 32-kDa OPN immunopositive bands in the testes of adult boars. In postnatal piglets, the 66-kDa OPN band was detected in the testes, but not the 32-kDa band. In the newborn testis, OPN immunostaining was seen in gonocytes and in some supporting cells in the seminiferous tubules, as well as in interstitial Leydig cells. In the adult boar testis, OPN immunoreactivity was detected in seminiferous tubules with varying intensities. Intense OPN immunostaining was seen in the residual bodies and acrosomes in the spermatids while, occasionally, OPN immunostaining was seen in spermatogonia and various stage of spermatocytes but in few Sertoli cells in the seminiferous tubules. In addition, Leydig cells in adult boars were weakly immunostained with OPN. These findings suggest that OPN is detected in the majority of germ cells and is involved in spermatogenesis in boar testis.
Animals ; Animals, Newborn ; Blotting, Western/veterinary ; Immunohistochemistry/veterinary ; Leydig Cells/metabolism ; Male ; Osteopontin/*biosynthesis ; Sertoli Cells/metabolism ; Spermatogenesis/physiology ; Spermatozoa/metabolism ; Swine/*metabolism ; Testis/cytology/*metabolism