Inflammatory cytokine gene expression in human periodontal ligament fibroblasts stimulated with bacterial lipopolysaccharides.
The effects of Porphyromonas gingivalis lipopolysaccharide (P-LPS) and Escherichia coli lipopolysaccharide (E-LPS) on the gene expression and production of inflammatory cytokines of human periodontal ligament fibroblasts (HPLF) were examined by a Northern (RNA blot) assay and enzyme-linked immunosorbent assay, respectively. mRNAs for interleukin-6 (IL-6), IL-8, and transforming growth factor beta (TGF-beta) were detected in HPLF cells, but IL-1 alpha, IL-1 beta, tumor necrosis factor alpha, transforming growth factor alpha, and granulocyte-macrophage colony-stimulating factor were not detected by reverse transcription-PCR. The expression of TGF-beta mRNA was not influenced by either LPS. P-LPS (1 to 10 micrograms/ml) and E-LPS (100 micrograms/ml) markedly stimulated the expression of IL-6 and IL-8 mRNAs compared with the control. The synthesis of IL-6 and IL-8 was also stimulated by 10 and 100 micrograms of both LPSs per ml, but IL-8 synthesis was not stimulated with E-LPS at 1 microgram/ml. Secretion of IL-6 and IL-8 into the culture medium was detected at 6 and 3 h, respectively, after exposure to P-LPS (10 micrograms/ml). These findings suggested that P. gingivalis leads to periodontal tissue destruction and alveolar bone resorption through IL-6 and IL-8 released from HPLF cells stimulated with its LPS.
Yamaji
Y
Y
Department of Endodontics, Kanagawa Dental College, Japan.
Kubota
T
T
Sasaguri
K
K
Sato
S
S
Suzuki
Y
Y
Kumada
H
H
Umemoto
T
T
D000469:Alkaline Phosphatase / Q000378:metabolism; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D016207:Cytokines / Q000235:genetics*; D005347:Fibroblasts / Q000378:metabolism; D006801:Humans; D015850:Interleukin-6 / Q000096:biosynthesis; D016209:Interleukin-8 / Q000096:biosynthesis; D008070:Lipopolysaccharides / Q000494:pharmacology*; D010513:Periodontal Ligament / Q000378:metabolism*; D012333:RNA, Messenger / Q000032:analysis
D016207:Cytokines; D015850:Interleukin-6; D016209:Interleukin-8; D008070:Lipopolysaccharides; D012333:RNA, Messenger; D000469:Alkaline Phosphatase