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J Clin Microbiol. 1986 March; 23(3): 517-522

Reaction pattern of human anti-Mycoplasma pneumoniae antibodies in enzyme-linked immunosorbent assays and immunoblotting.

ABSTRACT

In serological diagnosis of Mycoplasma pneumoniae disease the frequently used complement fixation test is based on a cross-reacting glycolipid. Recently enzyme-linked immunoassays have been developed to overcome this lack of specificity. To study the involvement of the various proteins and the influence of age on the level of antiprotein antibodies present, we investigated by enzyme-linked immunoassays (immunoglobulin M [IgM] and IgG) and immunoblotting the sera of healthy persons of different age groups as well as sera of patients (including paired sera) with M. pneumoniae infection. In sera of children with nonrespiratory diseases and in healthy blood donors the IgM antibodies rose during the first 2 years of life to a relatively constant background level (optical density at 405 nm of 0.15 to 0.21). In contrast IgG remained low up to the seventh year and then increased to moderate levels (optical density of 0.15). The blotting patterns showed few IgM bands in the age group of 20 to 30 years. IgG blots revealed, up to 7 years, only very few reactions with a 168-kilodalton protein, but in higher age groups a considerable number of reactions with proteins of 193, 168, 84, 69, and 56 kilodaltons were detected. In the sera of patients, positive IgM blots were most numerous in the third week, whereas the number of IgG blots increased up to the fourth and the fifth week. At this time all sera contained antibodies against the 168-kilodalton protein, which is identical with the adhesin of M. pneumoniae. In a patient with acute infection, who had a high preinfection IgG level, no IgM response developed. The data indicate a relatively high background of antibodies against M. pneumoniae proteins in older age groups, suggesting a requirement for paired sera. Furthermore, reinfections of adults may occur without a concomitant IgM response.

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