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Apoptosis and immuno-suppression in sheep infected with bluetongue virus serotype-23
- Umeshappa, Channakeshava Sokke, Singh, Karam Pal, Nanjundappa, Roopa Hebbandi, Pandey, Awadh Bihari
- Veterinary microbiology 2010 v.144 no.3-4 pp. 310-318
- sheep, Bluetongue virus, bluetongue, sheep diseases, immunosuppression (physiological), signs and symptoms (animals and humans), apoptosis, pathogenesis, disease course, spleen, monocytes, DNA damage, caspase-3, interferons, Pasteurella, animal pathogenic bacteria, pneumonia, bacterial pneumonia
- The role of apoptosis in pathogenesis of bluetongue (BT) has been suggested from various in vitro studies. However, to date, no clear data are available regarding BTV-induced apoptosis and its consequences in natural host, sheep. In the present study, bluetongue virus (BTV)-induced apoptosis was studied in sheep blood and splenic mononuclear cells by analyzing annexin⁺-propidium iodide⁻ early apoptotic cells, DNA ladder pattern, and caspase-3 gene expression. The onset of apoptosis and lymphocyte depletion in viraemic phase and IFN-α response indicated the involvement of BTV and IFN-α in the pathogenesis of BT. The development of Pasteurella pneumonia in 4 of 7 infected sheep during the experiment pointed to possible BTV-induced immuno-suppression and predisposition to secondary microbial infections. These results have significant implications not only in understanding immuno-pathological consequences but also in studying interactions of BTV with host cells.