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Cellular and molecular immune responses of the sea bass (Dicentrarchus labrax) experimentally infected with betanodavirus.
Scapigliati, G; Buonocore, F; Randelli, E; Casani, D; Meloni, S; Zarletti, G; Tiberi, M; Pietretti, D; Boschi, I; Manchado, M; Martin-Antonio, B; Jimenez-Cantizano, R; Bovo, G; Borghesan, F; Lorenzen, N; Einer-Jensen, K; Adams, S; Thompson, K; Alonso, C; Bejar, J; Cano, I; Borrego, J J; Alvarez, M C.
Afiliación
  • Scapigliati G; Dipartimento di Scienze Ambientali, Largo dell'Università, Università degli Studi della Tuscia, Viterbo 01100, Italy. scapigg@unitus.it
Fish Shellfish Immunol ; 28(2): 303-11, 2010 Feb.
Article en En | MEDLINE | ID: mdl-19925869
ABSTRACT
Naïve sea bass juveniles (38.4 + or - 4.5 g) were intramuscularly infected with a sublethal dose of betanodavirus isolate 378/I03, followed after 43 days by a similar boosting. This infection resulted in an overall mortality of 7.6%. At various intervals, sampling of fish tissues was performed to investigate i) B and T lymphocyte content in organs and tissues; ii), proliferation of leucocytes re-stimulated in vitro with inactivated virus; iii) presence of serum antibody specific for betanodavirus; iv) expression of genes coding for the following immunoregulatory molecules involved in innate and acquired responses type I IFN, Mx, IL-1, Cox-2; IL-10, TGF-beta, TCRbeta, CD4, CD8alpha, IgM, by using a quantitative PCR array system developed for sea bass. The obtained results showed a detectable increase of T cells and B cells in PBL during betanodavirus infection. Furthermore, leucocytes obtained from blood, head kidney, and gills showed a detectable "in vitro" increase in viability upon addition of inactivated viral particles, as determined by measuring intracellular ATP concentration. ELISA analysis of sera showed that exposure to nodavirus induced a low, but specific antibody titer measured 43 days after infection, despite the presence of measurable levels of natural antibody. Finally, a strong upregulation of genes coding for type I IFN, Mx, and IgM was identified after both infection and boosting. Interestingly, an upregulation of Cox-2 until boosting, and of TGF-beta and IL-10 after boosting was also observed, while the other tested genes did not show any significant variations with respect to mock-treated fish. Overall, our work represents a first comprehensive analysis of cellular and molecular immune parameters in a fish species exposed to a pathogenic virus.
Asunto(s)

Texto completo: 1 Base de datos: MEDLINE Asunto principal: Infecciones por Virus ARN / Lubina / Nodaviridae / Enfermedades de los Peces Límite: Animals Idioma: En Revista: Fish Shellfish Immunol Asunto de la revista: BIOLOGIA / MEDICINA VETERINARIA Año: 2010 Tipo del documento: Article País de afiliación: Italia

Texto completo: 1 Base de datos: MEDLINE Asunto principal: Infecciones por Virus ARN / Lubina / Nodaviridae / Enfermedades de los Peces Límite: Animals Idioma: En Revista: Fish Shellfish Immunol Asunto de la revista: BIOLOGIA / MEDICINA VETERINARIA Año: 2010 Tipo del documento: Article País de afiliación: Italia