title: Association of membrane/lipid rafts with the platelet cytoskeleton and the caveolin PY14: participation in the adhesion process.
abstract: Platelets are the most prominent elements of blood tissue involved in hemostasis at sites of blood vessel injury. Platelet cytoskeleton is responsible for their shape modifications observed during activation and adhesion to the substratum; therefore the interactions between cytoskeleton and plasma membrane are critical to modulate blood platelet functions. Several cytoskeletal components and binding partners, as well as enzymes that regulate the cytoskeleton, localize to membrane/lipid rafts (MLR) and regulate lateral diffusion of membrane proteins and lipids. Resting, thrombin-activated, and adherent human platelets were processed for biochemical studies including western-blot and immunprecipitation assays and confocal analysis were performed to characterize the interaction of MLR with the main cytoskeleton elements and β-dystroglycan as well as with the association of caveolin-1 PY14 with focal adhesion proteins. We transfected a megakaryoblast cell line (Meg-01) to deplete β-dystroglycan, subsequent to their differentiation to the platelet progenitors. Our data showed a direct interaction of the MLR with cytoskeleton to regulate platelet shape, while an association of caveolin-1 PY14 with vinculin is needed to establish focal adhesions, which are modulated for β-dystroglycan. In conclusion, caveolin-1 PY14 in association with platelet cytoskeleton participate in focal adhesions dynamics.
authors.affiliation: Laboratorio de Hematobiología, Escuela Nacional de Medicina y Homeopatía (ENMH), Instituto Politécnico Nacional (IPN), Mexico City, Mexico.
authors.forename: Doris
authors.initials: D
authors.lastname: Cerecedo
authors.affiliation: Laboratorio de Hematobiología, Escuela Nacional de Medicina y Homeopatía (ENMH), Instituto Politécnico Nacional (IPN), Mexico City, Mexico.
authors.forename: Ivette
authors.initials: I
authors.lastname: Martínez-Vieyra
authors.affiliation: Departamento de Biología Celular, Centro de Investigación y de Estudios Avanzados del IPN (Cinvestav-IPN), Mexico City, Mexico.
authors.forename: Deneb
authors.initials: D
authors.lastname: Maldonado-García
authors.affiliation: Departamento de Biología Celular, Centro de Investigación y de Estudios Avanzados del IPN (Cinvestav-IPN), Mexico City, Mexico.
authors.forename: Enrique
authors.initials: E
authors.lastname: Hernández-González
authors.affiliation: Department of Biomedical Science, University of Sheffield, Sheffield, UK.
authors.forename: Steve J
authors.initials: SJ
authors.lastname: Winder
mesh_terms: D001792:Blood Platelets / Q000166:cytology* / Q000378:metabolism; D051242:Caveolin 1 / Q000378:metabolism*; D002448:Cell Adhesion; D002454:Cell Differentiation; D002460:Cell Line; D003599:Cytoskeleton / Q000378:metabolism*; D049030:Dystroglycans / Q000378:metabolism; D051416:Focal Adhesion Protein-Tyrosine Kinases / Q000378:metabolism; D006801:Humans; D055016:Megakaryocyte Progenitor Cells / Q000166:cytology; D021962:Membrane Microdomains / Q000378:metabolism*; D013917:Thrombin / Q000378:metabolism; D016596:Vinculin / Q000378:metabolism*
chemical_list: C495540:CAV1 protein, human; D051242:Caveolin 1; C483081:DAG1 protein, human; C488955:VCL protein, human; D016596:Vinculin; D049030:Dystroglycans; D051416:Focal Adhesion Protein-Tyrosine Kinases; D013917:Thrombin
keywords: ADHERED PLATELETS; CAVEOLIN-1; DYSTROGLYCAN; Meg-01 CELLS