Differential effects of five Aggregatibacter actinomycetemcomitans strains on gingival epithelial cells

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Abstract

Introduction

We investigated gingival epithelial cell proliferation and expression of interleukin-8 (IL-8) and intercellular adhesion molecule 1 (ICAM-1) in response to Aggregatibacter actinomycetemcomitans serotypes a, b, and c.

Methods

Human gingival cells (Ca9-22) were cultured in bacterial extracts prepared from five strains of A. actinomycetemcomitans: ATCC 43717 (serotype a); ATCC 29524, ATCC 29522, and ATCC 43718 (all serotype b); and ATCC 43719 (serotype c).

Results

In bacterial extracts of ATCC 29522, cell growth was significantly impaired, while the expression of IL-8 and ICAM-1 was significantly increased. The level of induction in response to the other strains was minimal.

Conclusion

Our results indicate that the five strains of A. actinomycetemcomitans have distinct effects on the abilities of human gingival epithelial cells to proliferate and to produce proinflammatory factors.

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