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Tissue fibronectin is an endogenous ligand for galectin-1
Y Ozeki1, T Matsui, Y Yamamoto
1Division of Biomedical Polymer Science, School of Health Science, Fujita Health University, Aichi, Japan.
Glycobiology
|March 1, 1995
Summary
Human placenta contains galectin-1, a protein that binds to fibronectin and laminin. This interaction influences cell adhesion and extracellular matrix assembly, highlighting galectin-1's role in tissue development and function.
Area of Science:
- Biochemistry
- Cell Biology
- Developmental Biology
Background:
- Galectin-1, a beta-galactoside-binding lectin, is found in various animal tissues.
- Its endogenous ligands in human placenta were investigated to understand its biological functions.
Purpose of the Study:
- To identify galectin-1-binding proteins in human placenta.
- To elucidate the role of galectin-1 in extracellular matrix assembly and cell adhesion.
Main Methods:
- Affinity chromatography using galectin-1 conjugated Sepharose 4B.
- SDS-PAGE and Western blotting for protein identification.
- Immunohistochemistry for co-localization studies.
- Cell attachment assays to assess adhesion modulation.
Main Results:
- Two major galectin-1-binding proteins, fibronectin (220 kDa) and laminin (180 kDa), were identified in human placenta.
- Placental fibronectin showed strong binding to galectin-1, unlike plasma fibronectin.
- Galectin-1, fibronectin, and laminin were co-localized in the placental extracellular matrix.
- Galectin-1 enhanced rhabdosarcoma cell adhesion to placental fibronectin, an effect inhibited by lactose.
Conclusions:
- Tissue fibronectin and laminin are endogenous ligands for galectin-1.
- Galectin-1 may participate in extracellular matrix assembly.
- Galectin-1 influences cell adhesion through lectin-extracellular matrix interactions.