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Lectins inhibit cell binding and spreading on a laminin substrate.
J W Dean1, S Chandrasekaran, M L Tanzer
1Department of BioStructure and Function, School of Dental Medicine, University of Connecticut Health Center, Farmington 06032.
Biochemical and Biophysical Research Communications
|October 14, 1988
Summary
Wheat Germ Agglutinin lectin inhibited melanoma cell binding to laminin, while Concanavalin A affected cell spreading. Specific sugars reversed these lectin effects, suggesting oligosaccharide proximity to binding sites.
Area of Science:
- Biochemistry
- Cell Biology
- Glycobiology
Background:
- Laminin is a key extracellular matrix protein involved in cell adhesion.
- Lectins are proteins that bind to carbohydrates, offering tools to probe cell surface interactions.
- Understanding lectin-laminin interactions is crucial for cell binding and spreading mechanisms.
Purpose of the Study:
- To investigate the impact of Wheat Germ Agglutinin (WGA) and Concanavalin A (ConA) on laminin substrates.
- To determine the effects of these lectins on melanoma cell binding and spreading.
- To explore the role of N-linked oligosaccharides in these interactions.
Main Methods:
- Laminin substrates were exposed to varying concentrations of WGA and ConA.
- Mouse B16 F1 melanoma cell binding and spreading were assessed.
- Inhibition studies were performed using specific sugars for WGA and ConA.
Main Results:
- WGA exposure dose-dependently inhibited melanoma cell binding to laminin.
- ConA exposure did not affect cell binding but inhibited cell spreading.
- The addition of specific sugars completely prevented both WGA and ConA effects.
Conclusions:
- Lectin binding to laminin can modulate melanoma cell adhesion and morphology.
- N-linked oligosaccharides on laminin may be in close proximity to cell-binding sites.
- These findings highlight the importance of carbohydrate-protein interactions in cell-matrix adhesion.