title: Immunohistochemical and histopathological findings of ovine pulmonary adenocarcinoma (Jaagsiekte) in Egyptian sheep.
abstract: Ovine pulmonary adenocarcinoma (OPA) is a naturally occurring retrovirus-induced transmissible lung cancer in sheep. Lungs and associated (bronchial and mediastinal) lymph nodes of seven sheep with OPA were examined. Lungs had few multifocal consolidated slightly elevated gray to white masses ranging from 0.5 to 3 cm in diameter. Histopathologically, these masses appeared as well-differentiated acinar adenocarcinoma with little evidence of anaplasia. The acini composed of well-differentiated cuboidal to low columnar epithelium with clear or vacuolated cytoplasm and low mitotic index. No metastases were observed in the bronchial and mediastinal lymph nodes of any animal. The presence of Jaagsiekte sheep retrovirus (JSRV) was demonstrated in the lungs by immunohistochemistry. JSRV protein was detected in all tumor epithelial cells, histologically normal alveolar type II cells, and few bronchiolar epithelial cells, alveolar macrophages, lymphocytes, and plasma cells. This study is the first to confirm the presence of natural OPA in Egypt.
authors.affiliation: Department of Pathology and Parasitology, Faculty of Veterinary Medicine, Alexandria University, Edfina-Rashid-Behera, Egypt. samahoda@yahoo.com
authors.forename: Samah Shehata
authors.initials: SS
authors.lastname: Oda
authors.forename: Sameh Ahmed
authors.initials: SA
authors.lastname: Youssef
mesh_terms: D061354:Acinar Cells / Q000378:metabolism / Q000473:pathology / Q000821:virology; D002282:Adenocarcinoma, Bronchiolo-Alveolar / Q000378:metabolism / Q000662:veterinary* / Q000821:virology; D000818:Animals; D000956:Antigens, Viral / Q000378:metabolism; D036022:Capsid Proteins / Q000378:metabolism*; D004534:Egypt; D004847:Epithelial Cells / Q000378:metabolism / Q000821:virology; D022141:Jaagsiekte sheep retrovirus / Q000378:metabolism / Q000472:pathogenicity*; D008168:Lung / Q000378:metabolism* / Q000473:pathology; D008171:Lung Diseases / Q000473:pathology* / Q000821:virology; D008198:Lymph Nodes / Q000378:metabolism / Q000473:pathology / Q000821:virology; D008214:Lymphocytes / Q000378:metabolism / Q000821:virology; D016676:Macrophages, Alveolar / Q000378:metabolism / Q000821:virology; D010950:Plasma Cells / Q000378:metabolism / Q000821:virology; D011648:Pulmonary Adenomatosis, Ovine / Q000473:pathology* / Q000821:virology; D012191:Retroviridae Proteins / Q000378:metabolism*; D012756:Sheep; D034561:Sheep, Domestic
chemical_list: D000956:Antigens, Viral; D036022:Capsid Proteins; D012191:Retroviridae Proteins