Exogenous Small Ruminant Betaretrovirus Envelope Protein Is Detected in Draining Lymph Nodes in Contagious Respiratory Tumors of Sheep and Goats

De las Heras, M. (Universidad de Zaragoza) ; Reséndiz, R.A. ; González-Sáinz, J.M. (Universidad de Zaragoza) ; Ortín, A. (Universidad de Zaragoza)

Resumen: Contagious respiratory tumors of sheep and goats are epithelial neoplasms of the lung and nasal cavities. They are associated with oncogenic betaretroviruses known as jaagsiekte sheep retrovirus and enzootic nasal tumor retrovirus of sheep and goats. We investigated the presence of the envelope protein (ENV) of these retroviruses in retropharyngeal and mediastinal lymph nodes using a specific monoclonal antibody by immunohistochemistry methods, single-labeled or combined with ovine B or T lymphocytes or macrophage cell markers. Samples of lymph nodes, fixed in formalin and zinc fixative, were obtained from paraffin-embedded material. Four groups of samples were used: 24 natural cases of ovine pulmonary adenocarcinoma (OPA), 13 of enzootic nasal adenocarcinoma of sheep (ENAS), 19 of enzootic nasal adenocarcinoma of goats (ENAG), and 14 control samples. ENV was detected by single labeling in cortical lymphoid follicles. Six of 24 OPA samples were positive and only in those from sheep with extensive neoplasia. Immunolabeling was detected in 5/13 ENAS and 10/19 ENAG samples. Positive labeling was found either in the intercellular spaces, membranes, or cytoplasm of cells in follicles. Control samples were not correspondingly labeled. Double immunohistochemistry demonstrated co-labeling of ENV and CD21 (B cells and follicular dendritic cells) in all samples, CD14 (macrophage) in OPA samples, and Pax-5 (B cells) in ENAG samples, but not with CD8 or CD4 (T lymphocytes). These results demonstrate the presence of betaretrovirus ENV proteins in nontumor cells in regional lymph nodes in sheep and goats with contagious respiratory tumors.

Idioma: Inglés

DOI: 10.1177/0300985820980711

Año: 2020

Publicado en: Veterinary Pathology (2020), 1-8
ISSN: 0300-9858

Factor impacto JCR: 2.221 (2020)

Categ. JCR: VETERINARY SCIENCES rank: 40 / 146 = 0.274 (2020) - Q2 - T1
Categ. JCR: PATHOLOGY rank: 47 / 77 = 0.61 (2020) - Q3 - T2

Factor impacto SCIMAGO: 0.794 - Veterinary (miscellaneous) (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA-FSE/Construyendo Aragón 2016–2020-A15-17R
Financiación: info:eu-repo/grantAgreement/ES/UZ/Research group-Welfare and pathology of small ruminants

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Sanidad Animal (Dpto. Patología Animal)
Área (Departamento): Área Medicina y Cirugía Animal (Dpto. Patología Animal)