title: Surface plasmon resonance biosensor detects the downstream events of active PKCbeta in antigen-stimulated mast cells.
abstract: Surface plasmon resonance (SPR) biosensors detect large changes of angle of resonance (AR) when RBL-2H3 mast cells are cultured on a sensor chip and stimulated with antigen. However, the detail of molecular events that are responsible for such large changes of AR remained unknown. In this study, we investigated the relationship between intracellular signaling events induced by antigen and the change of AR, by genetic manipulation of intracellular signaling molecules; spleen tyrosine kinase (Syk), src-like adaptor protein (SLAP), linker for activation of T cells (LAT), growth-factor-receptor-bound protein 2 (Grb2), Grb2-related adaptor protein (Gads), and isotypes of protein kinase C (PKC). RBL-2H3 mast cells overexpressing dominant-negative Syk or SLAP, which both interfere with active Syk, exhibited only minimal increase of AR in response to antigen stimulation. Likewise, the interference of the activation of LAT and Gads, by expressing dominant-negative LAT and Gads, respectively, resulted in nearly complete suppression of the antigen-induced increase of AR. The cells overexpressing PKCs, apart from PKCbeta, showed a reduced extent of increase of AR in response to antigen stimulation. Moreover, the introduction of the small interfering RNA targeted against PKCbeta suppressed the antigen-induced increase of AR. These results indicate that the activation of Syk, LAT, Gads, and subsequent PKCbeta is indispensable for the antigen-induced increase of AR of mast cells detected by SPR biosensors.
authors.affiliation: Department of Dermatology, Graduate School of Biomedical Sciences, Hiroshima University, Minami-ku, Hiroshima 734-8551, Japan.
authors.forename: Maiko
authors.initials: M
authors.lastname: Tanaka
authors.forename: Takaaki
authors.initials: T
authors.lastname: Hiragun
authors.forename: Tomoko
authors.initials: T
authors.lastname: Tsutsui
authors.forename: Yuhki
authors.initials: Y
authors.lastname: Yanase
authors.forename: Hidenori
authors.initials: H
authors.lastname: Suzuki
authors.forename: Michihiro
authors.initials: M
authors.lastname: Hide
mesh_terms: D000818:Animals; D000941:Antigens / Q000276:immunology*; D015374:Biosensing Techniques / Q000379:methods*; D002460:Cell Line; D020869:Gene Expression Profiling / Q000379:methods; D007113:Immunity, Innate / Q000276:immunology*; D008407:Mast Cells / Q000276:immunology*; D011493:Protein Kinase C / Q000276:immunology*; D064546:Protein Kinase C beta; D051381:Rats; D015398:Signal Transduction / Q000276:immunology*; D020349:Surface Plasmon Resonance / Q000379:methods*
chemical_list: D000941:Antigens; D011493:Protein Kinase C; D064546:Protein Kinase C beta