title: Characterization of a spontaneously occurring arthritis in male DBA/1 mice.
abstract: OBJECTIVE
  We studied the incidence, severity, histopathologic features, and status of infection in a spontaneous polyarthritis which occurs in male DBA/1 mice.
  
  
  METHODS
  Over a 25-week period, the arthritis was evaluated macroscopically in naive mice of different strains. The histopathology was evaluated at different phases of the disease. Virologic and bacteriologic investigations were performed.
  
  
  RESULTS
  The arthritis occurs in approximately 80% of aging male DBA/1 mice. The disease is chronic and destructive, and the affected joints are characterized by synovial lining proliferation and infiltration of inflammatory cells, mainly mononuclear. The susceptibility appears to be dependent on both sex-linked and non-sex-linked genes, since female DBA/1 mice are not affected and since male BALB/c housed in the same colony are only marginally affected.
  
  
  CONCLUSIONS
  This first description of a spontaneous arthritis in aging male DBA/1 mice should provide new opportunities to study general features of a chronic and intermittent arthritis in a well-characterized strain, in which no generalized aberrations of the immune system have been described.
authors.affiliation: Department of Clinical Immunology, University Hospital, Uppsala, Sweden.
authors.forename: C
authors.initials: C
authors.lastname: Nordling
authors.forename: A
authors.initials: A
authors.lastname: Karlsson-Parra
authors.forename: L
authors.initials: L
authors.lastname: Jansson
authors.forename: R
authors.initials: R
authors.lastname: Holmdahl
authors.forename: L
authors.initials: L
authors.lastname: Klareskog
mesh_terms: D000375:Aging / Q000473:pathology*; D000818:Animals; D001168:Arthritis / Q000382:microbiology / Q000473:pathology*; D003587:Cytomegalovirus / Q000302:isolation & purification; D004195:Disease Models, Animal; D007596:Joints / Q000473:pathology; D008297:Male; D051379:Mice; D008811:Mice, Inbred DBA; D006517:Murine hepatitis virus / Q000302:isolation & purification