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Dynamic regulation of integrins
1Department of Renal Medicine, St. George Hospital, Kogarah, NSW, Australia.
Stem Cells (Dayton, Ohio)
|January 1, 1995
Summary
Integrin receptors dynamically regulate cell adhesion by changing conformation. This conformational change, particularly in alpha IIb beta 3, allows ligand binding upon platelet activation, crucial for cell aggregation.
Area of Science:
- Cellular Biology
- Molecular Biology
- Biochemistry
Background:
- Integrins are cell adhesion molecules with dynamically regulated function.
- This dynamic regulation significantly impacts cellular adhesive properties.
- Alpha IIb beta 3 (glycoprotein IIb-IIIa) on platelets is a key example, binding fibrinogen upon activation.
Purpose of the Study:
- To explore the dynamic regulation of integrin receptor function.
- To understand the conformational changes influencing ligand binding affinity.
- To investigate the role of intracellular signals and cytoplasmic tails in this regulation.
Main Methods:
- Characterization of integrin receptor function in resting and activated states.
- Analysis of ligand binding affinities, particularly fibrinogen to alpha IIb beta 3.
- Investigation of conformational changes using anti-integrin monoclonal antibodies.
Main Results:
- Integrin receptor function is dynamically regulated, altering ligand binding affinity.
- Platelet activation induces high-affinity fibrinogen binding to alpha IIb beta 3, leading to aggregation.
- Conformational changes in the external domain, influenced by intracellular signals and cytoplasmic tails, mediate this regulation.
Conclusions:
- Dynamic conformational changes are a general property of integrins, essential for cellular adhesion.
- Understanding these mechanisms is vital for comprehending cell signaling and adhesion processes.
- Further research is needed to elucidate the precise signal transduction pathway from the cell interior to the external domain.