Association of Mycoplasma arthritidis mitogen with lethal toxicity but not with arthritis in mice.
Mycoplasma arthritidis induces an acute to chronic arthritis in rodents. Arthritis induced in mice histologically resembles human rheumatoid arthritis and can be associated with lethal toxicity following systemic injection. The M. arthritidis mitogen (MAM) superantigen has long been implicated as having a role in pathogenesis, but its significance with respect to toxicity and arthritogenicity in mycoplasma-induced disease is unclear. To study the pathogenic significance of MAM, M. arthritidis mutants that overproduced or failed to produce MAM were developed. MAM overproduction and knockout mutants were more and less mitogenic, respectively, than the wild-type strain. The degree of mitogenic activity correlated with lethal toxicity in DBA/2J mice. In contrast, histopathological studies detected no correlation between MAM production and the severity of arthritis induced in DBA/2J and CBA/J mice.
Luo
Wenyi
W
Department of Genetics, University of Alabama at Birmingham, Birmingham, AL 35294-0024, USA.
Yu
Huilan
H
Cao
Zuhua
Z
Schoeb
Trenton R
TR
Marron
Michele
M
Dybvig
Kevin
K
D000818:Animals; D000942:Antigens, Bacterial / Q000235:genetics / Q000633:toxicity*; D001169:Arthritis, Experimental / Q000276:immunology / Q000382:microbiology / Q000473:pathology; D001170:Arthritis, Infectious / Q000276:immunology / Q000382:microbiology* / Q000473:pathology; D005260:Female; D051379:Mice; D009175:Mycoplasma Infections / Q000276:immunology / Q000382:microbiology* / Q000473:pathology; D045645:Mycoplasma arthritidis / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D018089:Superantigens / Q000235:genetics / Q000633:toxicity*
D000942:Antigens, Bacterial; C052996:Mycoplasma arthritidis mitogen; D018089:Superantigens
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