Enzootic nasal adenocarcinoma (ENA) is a
contagious and viral disease in sheep and goats. The disease leads to the death
of the affected animals and causes economic losses in infected small ruminant
flocks. Epithelial cell adhesion molecule (EpCAM) is a newly discovered tumor
antigen, commonly expressed by several tumors occurring in humans. Vascular
endothelial growth factor (VEGF) is a signal protein produced by cells that
stimulate the formation of blood vessels and plays an important role in
angiogenesis, essential for tumor development. In this study, ENA originating
from the nasal mucosa is detected on histopathological and cytopathological
examinations, with transmission electron microscopy confirming viral particles
in the tumoral cells. The aim of this study was to examine VEGF and EpCAM immunoexpressions
using streptavidin–biotin complex immunoperoxidase technique in 24 naturally ENA-affected
goats. Sneezing, dyspnea, seromucous or purulent nasal discharge, exophthalmos,
and weight loss were commonly observed clinical symptoms. The tumors located in
the nasal cavity were generally unilateral and were bilateral in only two cases.
Cytological examination of the tumoral masses revealed uniform epithelial cell
clusters and abundant inflammatory reaction. On histopathological examination,
tubular, papillary, or mixed types of ENA were diagnosed. On ultrastructural examination, intracytoplasmic,
spherical, retrovirus-like particles were demonstrated. Immunohistochemically,
strong positive reactions were reported for both EpCAM and VEGF in the
cytoplasm of the tumor cells. Thus, this study showed that EpCAM and VEGF may have
an important role in ENA pathogenesis.
Primary Language | English |
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Subjects | Veterinary Surgery |
Journal Section | Articles |
Authors | |
Publication Date | December 26, 2019 |
Published in Issue | Year 2020 |