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. 1987 Aug;55(8):1830–1836. doi: 10.1128/iai.55.8.1830-1836.1987

The principal protein antigens of isolates of Mycoplasma pneumoniae as measured by levels of immunoglobulin G in human serum are stable in strains collected over a 10-year period.

A C Vu, H M Foy, F D Cartwright, G E Kenny
PMCID: PMC260609  PMID: 3112011

Abstract

To determine whether antigenic variation in protein antigens of Mycoplasma pneumoniae occurred over time, 12 isolates obtained from pneumonia patients over a 10-year period (1964 to 1974) were compared by immunoblotting (Western blotting) against acute and convalescent human serum samples obtained from the same patients. The strains selected were isolated from patients who had low anti-lipid complement-fixing antibody titers in their acute-phase serum samples and high titers in their convalescent-phase serum samples. The polypeptide composition of the strains was closely similar by protein staining even when compared with prototype FH-Liu. On immunoblotting, all strains showed five bands (170, 130, 90, 45, and 35 kilodaltons [kDa]) which were stained more intensely by convalescent-phase than by acute-phase specimens. A sixth band (62 kDa) was detected by the conjugate alone. In FH-Liu, one band (110 kDa) was prominently stained by convalescent-phase specimens; this band was much less apparent in all of the clinical isolates. Two isolates possessed an additional band (92 kDa) which was stained more prominently by some but not all convalescent-phase specimens. Because of its known antigenic relationships and culture similarities, Mycoplasma genitalium was used for comparison. More polypeptides of M. genitalium than of M. pneumoniae were recognized by acute-phase serum samples, and 4 of 12 convalescent-phase serum samples showed increases in antibodies to certain M. genitalium polypeptides. However, these reactive polypeptides did not correspond in molecular mass to polypeptides recognized in M. pneumoniae; thus the signature profile of human convalescent-phase specimens with M. pneumoniae was distinct. These five polypeptides, individually or in combination, are especially promising for use in detection of human serum antibodies by enzyme-linked immunosorbent assay because they were found in all M. pneumoniae isolates tested.

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Selected References

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