title: Role of 14-3-3ζ in platelet glycoprotein Ibα-von Willebrand factor interaction-induced signaling.
abstract: The interaction of platelet glycoprotein (GP) Ib-IX with von Willebrand factor (VWF) exposed at the injured vessel wall or atherosclerotic plaque rupture initiates platelet transient adhesion to the injured vessel wall, which triggers intracellular signaling cascades leading to platelet activation and thrombus formation. 14-3-3ζ has been verified to regulate the VWF binding function of GPIb-IX by interacting with the cytoplasmic domains of GPIb-IX. However, the data regarding the role of 14-3-3ζ in GPIb-IX-VWF interaction-induced signaling still remain controversial. In the present study, the data indicate that the S609A mutation replacing Ser(609) of GPIbα with alanine (S609A) significantly prevented the association of 14-3-3ζ with GPIbα before and after the VWF binding to GPIbα. GPIb-IX-VWF interaction-induced activations of Src family kinases and protein kinase C were clearly reduced in S609A mutation. Furthermore, S609A mutation significantly inhibited GPIb-IX-VWF interaction-induced elevation of cytoplasmic Ca(2+) levels in flow cytometry analysis. Taken together, these data indicate that the association of 14-3-3ζ with the cytoplasmic domain of GPIbα plays an important role in GPIb-IX-VWF interaction-induced signaling.
authors: School of Biological Science and Medical Engineering, Beijing University of Aeronautics and Astronautics, 37 Xueyuan Road, Haidian district, Beijing 100083, China.
authors: Weilin
authors: W
authors: Zhang
authors: School of Biological Science and Medical Engineering, Beijing University of Aeronautics and Astronautics, 37 Xueyuan Road, Haidian district, Beijing 100083, China.
authors: Lili
authors: L
authors: Zhao
authors: School of Biological Science and Medical Engineering, Beijing University of Aeronautics and Astronautics, 37 Xueyuan Road, Haidian district, Beijing 100083, China.
authors: Jun
authors: J
authors: Liu
authors: School of Biological Science and Medical Engineering, Beijing University of Aeronautics and Astronautics, 37 Xueyuan Road, Haidian district, Beijing 100083, China.
authors: Juan
authors: J
authors: Du
authors: Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Key Laboratory of Thrombosis and Hemostasis of Ministry of Health, Suzhou 215007, China.
authors: Rong
authors: R
authors: Yan
authors: Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Key Laboratory of Thrombosis and Hemostasis of Ministry of Health, Suzhou 215007, China.
authors: Kesheng
authors: K
authors: Dai
mesh_terms: D048948:14-3-3 Proteins / Q000378:metabolism*; D000818:Animals; D016466:CHO Cells; D003412:Cricetulus; D006801:Humans; D019038:Platelet Glycoprotein GPIb-IX Complex / Q000235:genetics* / Q000378:metabolism*; D017354:Point Mutation; D060066:Protein Interaction Maps; D015398:Signal Transduction; D014841:von Willebrand Factor / Q000378:metabolism*
chemical_list: D048948:14-3-3 Proteins; D019038:Platelet Glycoprotein GPIb-IX Complex; D014841:von Willebrand Factor