title: Single cell observation of calcium signals in class II specific killer T cells.
abstract: A confocal fluorescence microscope with an argon ion laser and a digital imaging fluorescence microscope were used to study calcium signals in class II-specific killer T cells after interaction with target cells. Here, we used two kinds of I-Ak specific allogeneic killer T cell clones, QM11 (CD8+) and QM56 (CD4+), and target cells, B10.A spleen cells (I-Ak) and B cell hybridomas (TP67.21, I-Ak). After interaction with target cells, the intracellular free calcium ion concentration ([Ca2+]i) in QM11 cells (CD8+) increased rapidly with short lag-times (several seconds). The [Ca2+]i in QM56 cells (CD4+), however, increased with much longer lag-times (hundreds of seconds). The results were consistent with previous findings that the cytolytic activity of QM11 cells (CD8+) was much greater than that of QM56 cells (CD4+).
authors.affiliation: Faculty of Pharmaceutical Sciences, Nagoya City University, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Nagao
authors.forename: H
authors.initials: H
authors.lastname: Yamada
authors.forename: M
authors.initials: M
authors.lastname: Nakanishi
mesh_terms: D000818:Animals; D015704:CD4 Antigens / Q000276:immunology; D016827:CD8 Antigens / Q000276:immunology; D002118:Calcium / Q000378:metabolism*; D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D007694:Killer Cells, Natural / Q000276:immunology*; D051379:Mice; D008856:Microscopy, Fluorescence; D015398:Signal Transduction / Q000276:immunology*; D013997:Time Factors
chemical_list: D015704:CD4 Antigens; D016827:CD8 Antigens; D000949:Histocompatibility Antigens Class II; D002118:Calcium