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Antigenic differences within the species Mycoplasma hominis

Published online by Cambridge University Press:  15 May 2009

M. R. Hollingdale  and
Ruth M. Lemcke
M. R. Hollingdale
Affiliation:
Department of Microbiology, Lister Institute of Preventive Medicine, Chelsea Bridge Road, London, S.W.1
Ruth M. Lemcke
Affiliation:
Department of Microbiology, Lister Institute of Preventive Medicine, Chelsea Bridge Road, London, S.W.1
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Membrane and soluble fractions of one genital and two oral strains of Mycoplasma hominis were compared by immunodiffusion and polyacrylamide gel electrophoresis. Differences were demonstrated between the membrane antigens of the three strains by immunodiffusion, and the membrane proteins also gave dissimilar patterns in polyacrylamide gel electrophoresis. The soluble fractions gave identical lines in immunodiffusion tests and similar patterns in polyacrylamide gel electrophoresis.

When the strains were cross-titrated in metabolic inhibition (MI) and indirect haemagglutination (IHA) tests, statistical analysis of the results revealed significant differences between the strains. Previously, growth-inhibition, MI and IHA activity was shown to be associated with the membrane antigens of M. hominis, so the intraspecies differences revealed by MI and IHA correlate with the differences in the membrane antigens demonstrated by immunodiffusion. Growth-inhibition tests, which might also have been expected to show intraspecies differences, did not do so, probably because of the insensitivity of the test. In contrast to MI and IHA, complement-fixation (CF) tests revealed a high degree of relatedness between the strains. This is consistent with the observation that the soluble antigens of M. hominis participate in the CF reaction, and that the soluble antigens of different strains are identical in immunodiffusion tests.

Type
Research Article
Information
Journal of Hygiene , Volume 68 , Issue 3 , September 1970 , pp. 469 - 477
Copyright
Copyright © Cambridge University Press 1970

References

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