Platelet adhesion: structural and functional diversity of short dystrophin and utrophins in the formation of dystrophin-associated-protein complexes related to actin dynamics.
Platelets are dynamic cell fragments that modify their shape during activation. Utrophin and dystrophins are minor actin-binding proteins present in muscle and non-muscle cytoskeleton. In the present study, we characterised the pattern of Dp71 isoforms and utrophin gene products by immunoblot in human platelets. Two new dystrophin isoforms were found, Dp71f and Dp71 d, as well as the Up71 isoform and the dystrophin-associated proteins, alpha and beta -dystrobrevins. Distribution of Dp71d/Dp71delta110m, Up400/Up71 and dystrophin-associated proteins in relation to the actin cytoskeleton was evaluated by confocal microscopy in both resting and platelets adhered on glass. Formation of two dystrophin-associated protein complexes (Dp71d/Dp71delta110m approximately DAPC and Up400/Up71 approximately DAPC) was demonstrated by co-immunoprecipitation and their distribution in relation to the actin cytoskeleton was characterised during platelet adhesion. The Dp71d/Dp71delta100m approximately DAPC is maintained mainly at the granulomere and is associated with dynamic structures during activation by adhesion to thrombin-coated surfaces. Participation of both Dp71d/Dp71delta110m approximately DAPC and Up400/Up71 approximately DAPC in the biological roles of the platelets is discussed.
Cerecedo
Doris
D
Departamento Morfología, Escuela Nacional de Ciencias Biológicas, IPN, D.F., México.
Martínez-Rojas
Dalila
D
Chávez
Oscar
O
Martínez-Pérez
Francisco
F
García-Sierra
Francisco
F
Rendon
Alvaro
A
Mornet
Dominique
D
Mondragón
Ricardo
R
D008841:Actin Cytoskeleton / Q000378:metabolism*; D001792:Blood Platelets / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D048430:Cell Shape; D003599:Cytoskeleton / Q000187:drug effects / Q000378:metabolism; D016189:Dystrophin / Q000378:metabolism*; D049028:Dystrophin-Associated Protein Complex / Q000378:metabolism*; D049029:Dystrophin-Associated Proteins / Q000235:genetics / Q000378:metabolism; D005898:Glass; D006801:Humans; D009479:Neuropeptides / Q000235:genetics / Q000378:metabolism; D010973:Platelet Adhesiveness; D020033:Protein Isoforms; D011554:Pseudopodia / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism*; D013917:Thrombin / Q000494:pharmacology; D049411:Utrophin / Q000378:metabolism*
C490915:DTNA protein, human; C111539:DTNB protein, human; D016189:Dystrophin; D049028:Dystrophin-Associated Protein Complex; D049029:Dystrophin-Associated Proteins; D009479:Neuropeptides; D020033:Protein Isoforms; D012333:RNA, Messenger; D049411:Utrophin; C085339:apo-dystrophin 1; D013917:Thrombin