Acute canine distemper encephalitis is associated with rapid neuronal loss and local immune activation.
For most virus infections of the central nervous system (CNS), immune-mediated damage, the route of inoculation and death of infected cells all contribute to the pathology observed. To investigate the role of these factors in early canine distemper neuropathogenesis, we infected ferrets either intranasally or intraperitoneally with the neurovirulent canine distemper virus strain Snyder Hill. Regardless of the route of inoculation, the virus primarily targeted the olfactory bulb, brainstem, hippocampus and cerebellum, whereas only occasional foci were detected in the cortex. The infection led to widespread neuronal loss, which correlated with the clinical signs observed. Increased numbers of activated microglia, reactive gliosis and different pro-inflammatory cytokines were detected in the infected areas, suggesting that the presence and ultimate death of infected cells at early times after infection trigger strong local immune activation, despite the observed systemic immunosuppression.
Rudd
Penny A
PA
INRS-Institut Armand-Frappier, University of Quebec, Laval, Canada.
Bastien-Hamel
Louis-Etienne
LE
von Messling
Veronika
V
D000208:Acute Disease; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001812:Blood-Brain Barrier; D001921:Brain / Q000276:immunology; D016207:Cytokines / Q000032:analysis; D004216:Distemper / Q000276:immunology / Q000473:pathology*; D004217:Distemper Virus, Canine / Q000472:pathogenicity; D004285:Dogs; D018792:Encephalitis, Viral / Q000276:immunology / Q000473:pathology / Q000662:veterinary*; D005289:Ferrets; D005911:Gliosis / Q000473:pathology; D049452:Green Fluorescent Proteins; D008297:Male; D008969:Molecular Sequence Data; D009474:Neurons / Q000473:pathology*
D016207:Cytokines; C485184:enhanced green fluorescent protein; D049452:Green Fluorescent Proteins