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Beyond the Matrix: The Many Non-ECM Ligands for Integrins
Bryce LaFoya1, Jordan A Munroe2, Alison Miyamoto3
1Biomolecular Sciences PhD Program, Boise State University, Boise, ID 83725, USA. brycelafoya@u.boisestate.edu.
Integrins are cell surface receptors with traditional roles in matrix attachment. This review highlights their non-ECM ligands and diverse, non-traditional functions in immunity, cell trafficking, and pathogen interactions.
Area of Science:
- Cell Biology
- Immunology
- Biochemistry
Background:
- Integrins traditionally mediate cell adhesion to the extracellular matrix (ECM) and leukocyte-endothelial interactions.
- Emerging evidence reveals integrin functions beyond ECM binding, involving diverse non-ECM ligands.
Purpose of the Study:
- To review and summarize the non-ECM ligands that interact with integrins.
- To highlight the non-traditional functions of integrins mediated by these interactions.
Main Methods:
- Literature review of scientific publications on integrin-ligand interactions.
- Analysis of studies detailing integrin roles beyond ECM binding.
Main Results:
- Integrins engage in cell-cell interactions supporting immune functions like leukocyte transmigration and neutrophil extracellular trap formation.
- Integrins mediate cell homing for hematopoietic stem cells and tumor cells.
- Integrins act as receptors for growth factors, hormones, and small molecules.
- Pathogens utilize integrins for adhesion and internalization; parasites and venomous snakes disrupt integrin function.
Conclusions:
- Integrins possess a broad repertoire of functions mediated by non-ECM ligands.
- Understanding these non-traditional roles is crucial for fields ranging from immunology to infectious disease and cancer biology.
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