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Lack of Serotype Antigen in A. actinomycetemcomitans
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2010 (English)In: Journal of Dental Research, ISSN 0022-0345, E-ISSN 1544-0591, Vol. 89, no 3, 292-6 p.Article in journal (Refereed) Published
Abstract [en]

Aggregatibacter actinomycetemcomitans is divided into 6 serotypes. Occurrence of non-serotypeable strains is known, but background reasons are unclear. We hypothesized that non-serotypeable strains represent new serotypes or have altered expression of serotype-specific polysaccharide antigen (S-PA). We first characterized 311 strains from 189 individuals using both immunoassay- and PCR-based serotyping. Next, using natural human infection and rabbit immunization approaches, we clarified whether the phenotypically non-serotypeable strains expressed S-PA. Immunoassay identified serotypes a-f among 216 strains from 159 individuals. The remaining 95 strains from 30 individuals were phenotypically non-serotypeable. Yet, all these strains were identified by PCR-typing as serotype a-, b-, c-, or f. Non-serotypeability was confirmed by Western immunoblot with respective rabbit antisera. Patient sera remained non-reactive with autologous non-serotypeable strains at the serotype-specific region. Rabbit immunization with a phenotypically non-serotypeable strain induced no antibody production against S-PA. Thus, phenotypically non-serotypeable strains did not include novel serotypes, but lacked S-PA expression.

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2010. Vol. 89, no 3, 292-6 p.
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URN: urn:nbn:se:umu:diva-31883DOI: 10.1177/0022034509358865ISI: 000274431100014PubMedID: 20139341OAI: diva2:298072
Available from: 2010-02-21 Created: 2010-02-21 Last updated: 2011-10-24Bibliographically approved

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Oscarsson, JanAsikainen, Sirkka
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