title: Distribution of red-spotted grouper nervous necrosis virus (RGNNV) antigens in nervous and non-nervous organs of European seabass(Dicentrarchus labrax) during the course of an experimental challenge.
abstract: The distribution of red-spotted grouper nervous necrosis virus (RGNNV) antigens was examined by immunohistochemistry in the nervous and non-nervous organs of juvenile European seabass (Dicentrarchus labrax) during the course of an intramuscular infection. Histological changes resulting from the infection were evaluated from 3 days to 2 months post-infection. The specific antibody response was also studied 2 months post-challenge. Viral proteins were present throughout the experimental period in the retina (inner nuclear layer, ganglion layer, outer limiting membrane, and outer plexiform layer), brain(cerebellum and tectum opticum), and liver (hepatocytes and endothelial cells). These proteins were also observed in the renal tubular cells, white pulp of spleen, and in fibroblasts and cartilage of caudal fin. This is the first report of RGNNV proteins appearing in these organs, where the immunostaining was only detected at certain sampling times after the onset of mortality. Brain and retina of virus-exposed fish showed high levels of vacuolation, while accumulation of fat vacuoles was observed in the liver. RGNNV infection also induced a specific antibody response as measured by an ELISA. In summary, this is the first study demonstrating the presence of viral proteins in cells of caudal fin, kidney and spleen of European seabass.
authors.affiliation: IFAPA Centro El Toruño, Junta de Andalucía. El Puerto de Santa María, Cádiz, Spain.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Lopez-Jimena
authors.forename: Esther
authors.initials: E
authors.lastname: Garcia-Rosado
authors.forename: Kim Dawn
authors.initials: KD
authors.lastname: Thompson
authors.forename: Alexandra
authors.initials: A
authors.lastname: Adams
authors.forename: Carlos
authors.initials: C
authors.lastname: Infante
authors.forename: Juan Jose
authors.initials: JJ
authors.lastname: Borrego
authors.forename: Maria del Carmen
authors.initials: Mdel C
authors.lastname: Alonso
mesh_terms: D058500:Animal Fins / Q000378:metabolism / Q000821:virology; D000818:Animals; D000914:Antibodies, Viral / Q000378:metabolism; D000956:Antigens, Viral / Q000378:metabolism*; D001492:Bass; D001921:Brain / Q000378:metabolism / Q000821:virology; D004797:Enzyme-Linked Immunosorbent Assay / Q000662:veterinary; D005393:Fish Diseases / Q000821:virology*; D007150:Immunohistochemistry / Q000662:veterinary; D017403:In Situ Hybridization / Q000662:veterinary; D007668:Kidney / Q000378:metabolism / Q000821:virology; D008099:Liver / Q000378:metabolism / Q000821:virology; D030381:Nodaviridae; D012327:RNA Virus Infections / Q000662:veterinary*; D060888:Real-Time Polymerase Chain Reaction / Q000662:veterinary; D012160:Retina / Q000378:metabolism / Q000821:virology; D013154:Spleen / Q000378:metabolism / Q000821:virology
chemical_list: D000914:Antibodies, Viral; D000956:Antigens, Viral