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Grafting of Beads into Developing Chicken Embryo Limbs to Identify Signal Transduction Pathways Affecting Gene Expression
Published on: January 17, 2016
Correlation between fibronectin and its receptor in chick myoblast differentiation
1Department of Zoology, College of Natural Science, Seoul National University, Korea.
Journal of Cellular Physiology
|February 1, 1990
Summary
During chicken embryo myoblast differentiation, fibronectin levels and its receptor binding decrease. This reduction correlates with myoblast fusion, suggesting altered fibronectin receptors play a role in this process.
Area of Science:
- Cell Biology
- Developmental Biology
- Biochemistry
Background:
- Fibronectin is a crucial extracellular matrix protein involved in cell adhesion and migration.
- Myoblast differentiation and fusion are complex processes regulated by cell-surface interactions.
- Understanding fibronectin dynamics during myogenesis is key to deciphering muscle development.
Purpose of the Study:
- To investigate changes in fibronectin levels and its receptor characteristics during chicken embryo myoblast differentiation.
- To identify and characterize the specific fibronectin receptors involved in myoblast-matrix interactions.
- To correlate fibronectin alterations with the process of myoblast fusion.
Main Methods:
- Immunoblotting to quantify cell surface fibronectin levels.
- Radioligand binding assays using fibronectin fragments (28 kDa and 85 kDa) to characterize receptor interactions.
- Analysis of fibronectin receptor binding during different stages of myoblast differentiation and fusion.
- EGTA treatment to block myoblast fusion and assess fibronectin and receptor levels.
Main Results:
- Cell surface fibronectin amount decreased during myogenesis.
- The 28 kDa fibronectin fragment bound to a specific receptor (matrix assembly receptors) on myoblasts, with a dissociation constant of 1.4 x 10(-7) M and 3.4 x 10(5) binding sites/cell.
- Binding of the 28 kDa fragment and fibronectin levels decreased as myoblast fusion proceeded.
- Fusion-blocked myoblasts (EGTA treatment) maintained constant fibronectin and receptor binding levels.
Conclusions:
- Fibronectin levels and its specific receptor binding decrease during myoblast fusion.
- These alterations are closely linked to the fusion process itself.
- Changes in fibronectin receptors are implicated in the regulation of myoblast fusion during differentiation.
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