Cytokine profiles, apoptosis and pathology of experimental Pasteurella multocida serotype A1 infection in mice.
Mice were experimentally infected with Pasteurella multocida serotype A1 to study the cytokine profiles, host cell apoptosis and sequential pathology at different hours of post-infection. Infected mice were dull, anorectic and depressed. A transient leukocytopenia followed by progressive leukocytosis was observed in the course of infection. Serum cytokine profiles showed significantly (P<0.01) higher amount of pro-inflammatory cytokines (TNF-α, IL-1β, IL-6 and mouse KC) in the infected mice when compared to control mice. The circulating lymphocytes were apoptotic on annexin V staining. Apoptotic nuclei were detected in splenocytes, hepatocytes and infiltrating leukocytes of the lungs on TUNEL staining. The lungs were grossly congested and hemorrhagic, and showed infiltration with polymorphonuclear cells at early and mononuclear cells in the late hours of infection. Alveolar epithelia, inter-alveolar septa and capillary endothelium of the lungs showed ultrastructural changes. Liver had degenerative changes in histological and ultrathin sections.
Praveena
P Ezhil
PE
Division of Veterinary Pathology, Indian Veterinary Research Institute, Izatnagar 243 112, India.
Periasamy
Sivakumar
S
Kumar
A A
AA
Singh
Nem
N
D000818:Animals; D017209:Apoptosis / Q000276:immunology; D016207:Cytokines / Q000097:blood*; D005260:Female; D005434:Flow Cytometry; D020287:In Situ Nick-End Labeling; D053583:Interleukin-1beta / Q000097:blood; D015850:Interleukin-6 / Q000097:blood; D008099:Liver / Q000473:pathology; D008168:Lung / Q000473:pathology; D008214:Lymphocytes / Q000276:immunology / Q000473:pathology; D008297:Male; D051379:Mice; D010326:Pasteurella Infections / Q000276:immunology / Q000382:microbiology / Q000473:pathology / Q000662:veterinary*; D016979:Pasteurella multocida; D016133:Polymerase Chain Reaction; D014409:Tumor Necrosis Factor-alpha / Q000097:blood
D016207:Cytokines; D053583:Interleukin-1beta; D015850:Interleukin-6; D014409:Tumor Necrosis Factor-alpha