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The alphavbeta3 integrin regulates alpha5beta1-mediated cell migration toward fibronectin
K O Simon1, E M Nutt, D G Abraham
1Department of Bone Biology and Osteoporosis, Merck Research Laboratories, West Point, Pennsylvania 19486, USA.
The Journal of Biological Chemistry
|November 20, 1997
Summary
Integrin alphavbeta3 regulates cell migration mediated by integrin alpha5beta1. The beta3 integrin transmembrane domain is crucial for this alphavbeta3-dependent regulation of cell migration on fibronectin.
Area of Science:
- Cell biology
- Molecular biology
- Biochemistry
Background:
- Integrins are cell surface receptors that mediate cell adhesion and migration.
- Integrin alphavbeta3 and alpha5beta1 are known to play roles in cell migration.
- Interactions between different integrins can influence cellular functions.
Purpose of the Study:
- To investigate the regulatory role of integrin alphavbeta3 in cell migration mediated by integrin alpha5beta1.
- To identify the specific domains of beta3 integrin subunit involved in this regulation.
Main Methods:
- Transfection of HEK 293 cells with alphavbeta3 and beta3 mutants.
- Measurement of cell attachment and migration to fibronectin (Fn) and vitronectin (Vn).
- Use of blocking antibodies and specific ligands to probe integrin function.
Main Results:
- Integrin alphavbeta3 blocking antibody and ligand inhibited alpha5beta1-mediated migration toward Fn, but not attachment.
- Mutations in the beta3 integrin subunit affected ligand binding and cell migration.
- Truncation of the beta3 transmembrane domain abolished alphavbeta3-mediated inhibition of migration.
Conclusions:
- Integrin alphavbeta3 actively regulates alpha5beta1-mediated cell migration.
- The transmembrane domain of beta3 integrin is essential for this regulatory function.
- Findings provide insights into integrin crosstalk in cell migration.