title: N-acetyl-D-galactosamine specific lectin of Eikenella corrodens induces intercellular adhesion molecule-1 (ICAM-1) production by human oral epithelial cells.
abstract: During the acute inflammatory response in periodontitis, gingival epithelial cells are considered to play important roles in the recruitment of inflammatory cells to the site of infection through the secretion of chemokines. However, little is known about the expression of molecules that are involved in the interaction between the epithelium and neutrophils following bacterial attachment. Earlier work reported that periodontopathogenic Eikenella corrodens strain 1,073 up-regulated the expression and secretion of chemokines such as interleukin-8 (IL-8) from KB cells (a human oral epithelial cell line derived from a human oral epidermoid carcinoma). To elucidate the mechanism of the transmigration of neutrophils through the epithelium, the present study investigated the expression of adhesion molecules on KB cells in response to E. corrodens attachment. Adhesion molecule gene expression was assessed by RT-PCR and adhesion proteins expressed on KB cell surfaces were determined by cell-based ELISA and FACS. In RT-PCR, ICAM-1 mRNA levels were significantly increased within 1 h in response to exposure to E. corrodens and continued to increase over the 12-h period of study. In ELISA, increased surface ICAM-1 expression was paralleled by increased ICAM-1 mRNA levels. Furthermore, the increases in ICAM-1 expression on epithelial cells infected with E. corrodens were observed to be due to the N-acetyl-D-galactosamine (GalNAc) specific bacterial lectin-like substance of E. corrodens (EcLS), which was one of the adhesins of E. corrodens. This is the first study to report that a bacterial lectin-like substance increased the expression of ICAM-1 on gingival epithelial cells.
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Yamada
authors.forename: Hideaki
authors.initials: H
authors.lastname: Nakae
authors.forename: Hiromichi
authors.initials: H
authors.lastname: Yumoto
authors.forename: Chihiro
authors.initials: C
authors.lastname: Shinohara
authors.affiliation: Department of Conservative Dentistry, Tokushima University School of Dentistry, Tokushima 770-8504 and *Department of Restorative Dentistry and Endodontology, Osaka University Graduate School of Dentistry, Osaka 565-0871, Japan.
authors.forename: Shigeyuki
authors.initials: S
authors.lastname: Ebisu
authors.forename: Takashi
authors.initials: T
authors.lastname: Matsuo
mesh_terms: D000116:Acetylgalactosamine / Q000276:immunology / Q000502:physiology*; D001422:Bacterial Adhesion / Q000502:physiology; D016124:Eikenella corrodens / Q000502:physiology*; D004797:Enzyme-Linked Immunosorbent Assay; D004847:Epithelial Cells / Q000382:microbiology; D005434:Flow Cytometry; D015964:Gene Expression Regulation, Bacterial; D016905:Gram-Negative Bacterial Infections / Q000276:immunology / Q000382:microbiology; D006801:Humans; D018799:Intercellular Adhesion Molecule-1 / Q000096:biosynthesis* / Q000235:genetics; D016209:Interleukin-8 / Q000276:immunology; D007624:KB Cells / Q000382:microbiology; D037102:Lectins / Q000502:physiology*; D009061:Mouth Mucosa / Q000382:microbiology; D009504:Neutrophils / Q000502:physiology*; D010518:Periodontitis / Q000382:microbiology; D012333:RNA, Messenger / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D016209:Interleukin-8; D037102:Lectins; D012333:RNA, Messenger; D018799:Intercellular Adhesion Molecule-1; D000116:Acetylgalactosamine