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The effect of glycoprotein IIb-IIIa receptor occupancy on the cytoskeleton of resting and activated platelets.
- Source :
-
The Journal of biological chemistry [J Biol Chem] 1991 Jul 25; Vol. 266 (21), pp. 13891-900. - Publication Year :
- 1991
-
Abstract
- The platelet integrin, glycoprotein IIb-IIIa (GPIIb-IIIa), serves as the receptor for fibrinogen. This study examined what effect GPIIb-IIIa receptor occupancy had on the cytoskeleton of resting and activated platelets. Triton X-100-insoluble residues (cytoskeletons) were isolated from resting washed platelets incubated with either 500 microM RGDS or 500 microM RGES and examined for protein content. RGDS did not increase the amount of GPIIb-IIIa associated with the cytoskeletal residues which sedimented at either 15,800 x g or 100,000 x g. To determine the effect of receptor occupancy on the formation of the activated platelet cytoskeleton, stirred and nonstirred RGDS-treated platelets in plasma were activated with ADP. Triton X-100-insoluble residues were isolated and examined for both protein content and retention of GPIIb-IIIa. Further, morphological studies were performed on the RGDS-ADP-stimulated platelets. The results of this study suggest that 1) RGDS peptide receptor occupancy does not lead to GPIIb-IIIa linkage to the cytoskeleton, 2) ADP-stimulated platelet shape change, polymerization of actin, and association of myosin with the cytoskeleton are unaffected by RGDS peptide receptor occupancy. 3) RGDS inhibits an aggregation-dependent incorporation of ABP, alpha-actinin, talin, and GPIIb-IIIa into the Triton-insoluble residue.
- Subjects :
- Actinin metabolism
Adenosine Diphosphate pharmacology
Antibodies, Monoclonal immunology
Blood Platelets ultrastructure
Cytochalasin B pharmacology
Cytoskeletal Proteins metabolism
Cytoskeleton metabolism
Humans
In Vitro Techniques
Microfilament Proteins metabolism
Microscopy, Electron, Scanning
Oligopeptides metabolism
Platelet Aggregation
Platelet Membrane Glycoproteins immunology
Talin
Blood Platelets physiology
Cytoskeleton ultrastructure
Platelet Activation
Platelet Membrane Glycoproteins metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 0021-9258
- Volume :
- 266
- Issue :
- 21
- Database :
- MEDLINE
- Journal :
- The Journal of biological chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 1906886