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Fibronectin is a binding partner for the myelin-associated glycoprotein (siglec-4a)
K Strenge1, R Brossmer, P Ihrig
1Institute of Biochemistry, University of Kiel, Germany. kstrenge@biochem.uni-kiel.de
Abstract:
The myelin-associated glycoprotein (MAG) mediates cell-cell interactions between myelinating glial cells and neurons. Here we describe the extracellular matrix glycoprotein fibronectin as a binding partner of MAG. It has been identified by affinity precipitation with MAG-Fc from NG108-15 cells and by microsequencing of two peptides derived from a 210-kDa protein band. Western blot analysis showed that fibronectin is also present in MAG binding partners isolated from N(2)A (murine neuroblastoma) cells, rat brain and rat spinal cord. Different fibronectin isoforms have been isolated from brains of young and adult rats, indicating that the expression of MAG binding fibronectin changes during development.
Insights
Researchers identified fibronectin as a binding partner for the myelin-associated glycoprotein (MAG). This interaction, crucial for cell communication in the nervous system, changes during development.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- The myelin-associated glycoprotein (MAG) is vital for cell-cell interactions between neurons and myelinating glial cells.
- Understanding MAG's molecular interactions is key to deciphering neural development and function.
Purpose of the Study:
- To identify novel binding partners of the myelin-associated glycoprotein (MAG).
- To investigate the role of fibronectin in MAG-mediated cellular interactions.
Main Methods:
- Affinity precipitation using MAG-Fc from NG108-15 cells.
- Protein microsequencing to identify MAG-binding proteins.
- Western blot analysis to confirm fibronectin presence in various neural tissues.
- Isolation of fibronectin isoforms from rat brains at different developmental stages.
Main Results:
- Fibronectin was identified as a direct binding partner of MAG.
- Fibronectin was confirmed to be present in MAG-binding complexes from neuronal and glial cell lines, as well as brain and spinal cord tissues.
- Distinct fibronectin isoforms were found in young and adult rat brains, suggesting developmental regulation.
Conclusions:
- Fibronectin is a novel extracellular matrix binding partner of MAG.
- The interaction between MAG and fibronectin may play a significant role in neural development and function.
- Developmental changes in fibronectin expression highlight its dynamic role in the nervous system.