Actinobacillus actinomycetemcomitans (A. actinomycetemcomitans) is an important pathogen casuing aggressive periodontitis. The present study was designed to investigate the chemokines expression regulated by A. actinomycetemcomitans lipopolysaccharide (LPS). Chemokines genes expression profiling was performed in Raw 264.7 cells by analyses of microarray and reverse transcription-polymerase chain reaction (RT-PCR). Microarray results showed that the induction of monocyte chemoattractant protein-1 (MCP-1) and macrophage inflammatory protein-1? (MIP-1?), MIP-1?, MIP-1?, regulated upon activation, normal T-cell expressed and secreted (RANTES), macrophage inflammatory protein-2 (MIP-2), and interferon-? inducible protein 10 (IP 10) by A. actinomycetemcomitans LPS was increased to 12.5, 1.53, 9.09, 17.3, 2.82, 16.1, and 18.1 folds at 18 h, respectively. To check these chemo- kines expression by A. actinomycetemcomitans LPS, we examined gene expressions by RT-PCR, and found that the expression of MIP-1?, MIP-1?, RANTES, MIP-2, and IP 10 was increased 107.1, 93.6, 106.8, 86.5, and 162.0 folds at 18 h, respectively. These results indicate that A. actinomy-cetemcomitans LPS stimulates the several chemokines expressions (MIP-1?, MIP-1?, MIP-1?, RANTES, MIP-2, and IP 10) in Raw 264.7 cells.

Keywords: A. actinomycetemcomitans LPS, IP 10, MCP-1, MIP-1, MIP-2, RANTES