title: [CD226 monoclonal antibody induces variation of intracytosolic free calcium level in human umbilical vein endothelial cells].
abstract: In order to study the possible mechanism of CD226 monoclonal antibody (mAb)-mediated intracellular message transduction in human umbilical vein endothelial cells (HUVECs), the influence of CD226 mAb and its cross-linking by secondary antibody (II Ab) on the concentration changes in [Ca(2+)](i) in the HUVECs under different conditions were determined by confocal laser scanning microscopy. The main results are as follows. (1) When the culture medium was balanced by Hanks Buffer, [Ca(2+)](i) in HUVECs increased slowly after stimulation by CD226 mAb, whereas [Ca(2+)](i) increase was accompanied by [Ca(2+)](o) decrease after the mAb was cross-linked by goat anti-mouse IgG. Then [Ca(2+)](i) and [Ca(2+)](o) all returned to the normal level. (2) When the culture medium was balanced by D-Hanks buffer, [Ca(2+)](i) in HUVECs showed little variation when the cells were stimulated by CD226 mAb, but [Ca(2+)](i) decreased markedly after cross-linking. (3) When HUVECs were pretreated with EGTA, there was no variation in [Ca(2+)](i) of HUVECs after CD226 mAb stimulation alone or cross-linking of the mAb. Our results suggest that stimulation by CD226 mAb and cross-linking by goat anti-mouse IgG induce the variation of [Ca(2+)](i) in HUVECs under different conditions and the variation of [Ca(2+)](i) in HUVECs may play an important role in many physiological and pathological processes.
authors.affiliation: Department of Immunology, Fourth Military Medical University, Xi'an 710032.
authors.forename: Li-Hua
authors.initials: LH
authors.lastname: Chen
authors.forename: Xue-Song
authors.initials: XS
authors.lastname: Liu
authors.forename: Fei
authors.initials: F
authors.lastname: Liu
authors.forename: Bo-Quan
authors.initials: BQ
authors.lastname: Jin
mesh_terms: D000911:Antibodies, Monoclonal / Q000494:pharmacology*; D000945:Antigens, Differentiation, T-Lymphocyte / Q000276:immunology*; D002118:Calcium / Q000378:metabolism*; D002478:Cells, Cultured; D061307:Human Umbilical Vein Endothelial Cells / Q000378:metabolism* / Q000502:physiology*; D006801:Humans; D000098862:T Lineage-Specific Activation Antigen 1
chemical_list: D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D000098862:T Lineage-Specific Activation Antigen 1; D002118:Calcium