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Journal of Clinical Microbiology, February 2002, p. 512-518, Vol. 40, No. 2
0095-1137/01/$04.00+0     DOI: 10.1128/JCM.40.2.512-518.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Multiserotype Enzyme-Linked Immunosorbent Assay as a Diagnostic Aid for Periodontitis in Large-Scale Studies

P. J. Pussinen,1* T. Vilkuna-Rautiainen,1 G. Alfthan,2 K. Mattila,3 and S. Asikainen1

Institute of Dentistry, University of Helsinki,1 National Public Health Institute, Biomarker Laboratory ,2 Department of Medicine, Division of Infectious Diseases, Helsinki University Central Hospital, Helsinki, Finland3

Received 10 May 2001/ Returned for modification 20 September 2001/ Accepted 8 November 2001

Periodontitis is a common chronic oral infection caused by gram-negative bacteria, including Actinobacillus actinomycetemcomitans and Porphyromonas gingivalis. Periodontitis evokes inflammatory host response locally in the periodontium but also systemically. The systemic humoral antibody response against oral pathogens can conveniently be measured by an immunoassay. The aim of the study was to measure serum immunoglobulin G class antibodies against A. actinomycetemcomitans and P. gingivalis by an enzyme-linked immunosorbent assay (ELISA) in which mixtures of several serotypes of the pathogens were used as antigens to avoid biasing of the results in favor of a particular strain. For A. actinomycetemcomitans the antigen consisted of six strains representing serotypes a, b, c, d, and e and one nonserotypeable strain. In the P. gingivalis ELISA, antigens representing serotypes a, b, and c were used. Serum samples from 90 subjects, including 35 samples from patients with diagnosed periodontitis, 10 samples from periodontally healthy controls, and 45 samples from randomly selected apparently healthy volunteers (referred to as "healthy subjects"), were tested. For both pathogens the antibody levels (means ± standard deviations) of the patients—expressed as area under the dilution curve—were significantly higher than those for healthy controls or healthy subjects, with values for A. actinomycetemcomitans and P. gingivalis, respectively, as follows: patients, 22.60 ± 9.94 mm2 and 26.72 ± 11.13 mm2; healthy controls, 9.99 ± 3.92 mm2 and 6.90 ± 3.38 mm2; and healthy subjects, 16.85 ± 6.67 mm2 and 8.51 ± 4.23 mm2. The serotype mixture ELISA is suitable for measuring antibodies against periodontal pathogens in large epidemiological studies in order to evaluate the role of periodontitis as a risk factor for other diseases.

* Corresponding author. Mailing address: Institute of Dentistry, Biomedicum Helsinki, P.O. Box 63, FIN-00014 Helsinki University, Finland. Phone: 358-9-191 25211. Fax: 358-9-191 25371. E-mail: pirkko.pussinen{at}helsinki.fi.

Journal of Clinical Microbiology, February 2002, p. 512-518, Vol. 40, No. 2
0095-1137/01/$04.00+0     DOI: 10.1128/JCM.40.2.512-518.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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