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Use of adherence protein of Mycoplasma pneumoniae as antigen for enzyme-linked immunosorbent assay (ELISA).
Israel Journal of Medical Sciences 1987 June
Antibodies against the adherence protein of Mycoplasma pneumoniae are regularly found in patients with M. pneumoniae infection. Therefore, this 168-kilodalton (kDa) protein was used as an antigen in a dot-ELISA for serological diagnosis of M. pneumoniae disease. M. pneumoniae proteins were separated by preparative sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), gels were stained with Coomassie Blue, and the 168-kDa protein band was cut out and eluted using a special electroelution device. Isolated proteins or sonicated whole-cell antigens, respectively, were immobilized on a 96-well filtration plate with a nitrocellulose bottom (dot-ELISA). The test procedure was performed as in conventional ELISA tests, using alkaline phosphatase-labeled antihuman IgM or IgG antibodies, respectively, to detect antigen-antibody complexes. All results were confirmed by immunoblotting. The dot-ELISA using the 168-kDa antigen proved to be sensitive and specific. The specificity was tested on 53 sera of M. pneumoniae infections and on 490 serum specimens of patients with other respiratory diseases due to other pathogens, or with clinical conditions such as pancreatitis, meningitis or endocarditis. With regard to IgM antibodies, no false-positive reactions were found in non-M. pneumoniae diseases against the 168-kDa antigen, but there were such reactions against other M. pneumoniae proteins in immunoblots.
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