title: Role of cell-cell communication in inhibiting butyric acid-induced T-cell apoptosis.
abstract: We have previously demonstrated that human gingival fibroblasts rescue butyric acid-induced T-cell apoptosis via proinflammatory cytokines such as interleukin 6 (IL-6) and IL-11, which are produced by fibroblasts stimulated with butyric acid. In this study, we determined if T-cell adhesion to human gingival fibroblasts influenced the susceptibility of T cells to butyric acid-induced apoptosis. We have shown that the number of Jurkat T cells adherent to gingival fibroblasts (Gin-1 cells) was significantly increased by the addition of butyric acid. All Jurkat cells that adhered to Gin-1 cells remained viable, while the nonadherent Jurkat cells dropped into apoptosis. The increase in T-cell adhesion to fibroblasts was also observed when Jurkat cells, but not Gin-1 cells, were pretreated with butyric acid. The expression levels of CD44, very late antigen 2 (VLA-2) and VLA-5 but not of leukocyte function-associated antigen 1 (LFA-1) and VLA-4 on Jurkat cells were increased following treatment with butyric acid. Furthermore, pretreatment of butyric acid-sensitized Jurkat cells with monoclonal antibodies against CD44, VLA-2, and VLA-5, but not LFA-1 and VLA-4, followed by coculture with Gin-1 cells inhibited T-cell adhesion to fibroblasts and increased apoptosis of nonadherent T cells after coculture of gingival fibroblasts and Jurkat cells. These results indicate that T-cell adherence to fibroblasts is enhanced by butyric acid and that butyric acid-induced T-cell apoptosis is down-regulated by T-cell adhesion to gingival fibroblasts through an interaction with the adhesion molecules CD44, VLA-2, and VLA-5 expressed on T cells stimulated with butyric acid.
authors.affiliation: Department of Microbiology, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba, Japan. tkurita@mascat.nihon-u.ac.jp
authors.forename: Tomoko
authors.initials: T
authors.lastname: Kurita-Ochiai
authors.forename: Shintaro
authors.initials: S
authors.lastname: Seto
authors.forename: Kuniyasu
authors.initials: K
authors.lastname: Ochiai
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology / Q000494:pharmacology; D017209:Apoptosis / Q000187:drug effects*; D020148:Butyric Acid / Q000037:antagonists & inhibitors* / Q000494:pharmacology*; D002448:Cell Adhesion / Q000187:drug effects; D015815:Cell Adhesion Molecules / Q000378:metabolism; D002450:Cell Communication / Q000187:drug effects*; D002460:Cell Line; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects; D005881:Gingiva / Q000166:cytology; D006801:Humans; D018960:Hyaluronan Receptors / Q000378:metabolism; D038982:Integrin alpha2beta1 / Q000378:metabolism; D039081:Integrin alpha5beta1 / Q000378:metabolism; D019169:Jurkat Cells; D013601:T-Lymphocytes / Q000166:cytology* / Q000187:drug effects* / Q000378:metabolism
chemical_list: D000911:Antibodies, Monoclonal; D015815:Cell Adhesion Molecules; D018960:Hyaluronan Receptors; D038982:Integrin alpha2beta1; D039081:Integrin alpha5beta1; D020148:Butyric Acid