Effects of cyclosporin A induced T-lymphocyte depletion on the course of avian Metapneumovirus (aMPV) infection in turkeys.
The avian Metapneumovirus (aMPV) causes an economically important acute respiratory disease in turkeys (turkey rhinotracheitis, TRT). While antibodies were shown to be insufficient for protection against aMPV-infection, the role of T-lymphocytes in the control of aMPV-infection is not clear. In this study we investigated the role of T-lymphocytes in aMPV-pathogenesis in a T-cell-suppression model in turkeys. T-cell-intact turkeys and turkeys partly depleted of functional CD4(+) and CD8(+) T-lymphocytes by Cyclosporin A (CsA) treatment were inoculated with the virulent aMPV subtype A strain BUT 8544. CsA-treatment resulted in a significant reduction of absolute numbers of circulating CD4(+) and CD8alpha(+) T-lymphocytes by up to 82 and 65%, respectively (P<0.05). Proportions of proliferating T-cells within mitogen-stimulated peripheral blood mononuclear cells were reduced by similar levels in CsA-treated birds compared to untreated controls (P<0.05). CsA-treated turkeys showed delayed recovery from aMPV-induced clinical signs and histopathological lesions and a prolonged detection of aMPV in choanal swabs. The results of this study show that T-lymphocytes play an important role in the control of primary aMPV-infection in turkeys.
Rubbenstroth
Dennis
D
Clinic for Poultry, University of Veterinary Medicine Hannover, Bünteweg 17, Hannover, Germany.
Dalgaard
Tina S
TS
Kothlow
Sonja
S
Juul-Madsen
Helle R
HR
Rautenschlein
Silke
S
D000818:Animals; D015704:CD4 Antigens / Q000096:biosynthesis; D016827:CD8 Antigens / Q000096:biosynthesis; D002452:Cell Count; D049109:Cell Proliferation / Q000187:drug effects; D016572:Cyclosporine / Q000008:administration & dosage; D007111:Immunity, Cellular; D008212:Lymphocyte Depletion; D029121:Metapneumovirus / Q000276:immunology* / Q000472:pathogenicity; D018184:Paramyxoviridae Infections / Q000097:blood / Q000276:immunology*; D016176:T-Lymphocyte Subsets / Q000187:drug effects / Q000276:immunology* / Q000378:metabolism* / Q000473:pathology; D014422:Turkeys
D015704:CD4 Antigens; D016827:CD8 Antigens; D016572:Cyclosporine