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Infect Immun. 1990 November; 58(11): 3679-3688

Variable antigens of Ureaplasma urealyticum containing both serovar-specific and serovar-cross-reactive epitopes.

Department of Microbiology, University of Alabama, Birmingham School of Medicine 35294.

ABSTRACT

Currently there are 14 recognized serovars of Ureaplasma urealyticum, and it has been postulated that only certain ones may be associated with disease and that lack of serovar-specific antibody may be an important risk factor. Unfortunately, ureaplasma antigens important in the human immune response and disease pathogenesis are poorly defined. By using sera from ureaplasma-infected patients and antiureaplasma monoclonal antibodies, the present study has demonstrated, for serovars 3, 8, and 10, antigens which (i) are species specific, (ii) contain both serovar-specific and cross-reactive epitope(s), (iii) are produced not only in vitro but also in vivo, (iv) undergo a high rate of structural variation in vitro, (v) are present and structurally variable on invasive ureaplasma isolates (i.e., those from placenta, lung, and cerebrospinal fluid), and (vi) are among the predominant antigens recognized during infections in humans. Furthermore, we have shown that monoclonal antibodies to these antigens can inhibit the growth of the organisms in vitro, indicating the potential for these antigens to be important for host defense.

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