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Biosynthesis of fibronectin by rabbit aorta
I Takasaki1, A V Chobanian, P Brecher
1Department of Medicine, Boston University School of Medicine, Massachusetts 02118.
The Journal of Biological Chemistry
|September 15, 1991
Summary
Researchers developed a method to study fibronectin biosynthesis in rabbit aorta rings. Smooth muscle cells are the primary source of fibronectin, which is rapidly incorporated into the extracellular matrix.
Area of Science:
- Vascular Biology
- Extracellular Matrix Biology
- Protein Biosynthesis
Background:
- In vitro studies show fibronectin influences vascular cell phenotypes.
- Understanding fibronectin's in vivo role requires studying its biosynthesis in intact vascular tissue.
Purpose of the Study:
- Establish methodology to study fibronectin biosynthesis in rabbit aorta.
- Investigate the characteristics and cellular sources of fibronectin synthesis in the aorta.
Main Methods:
- Incubation of rabbit aortic rings with 35S-labeled methionine.
- Quantitative immunoprecipitation using anti-fibronectin antibody.
- Pulse-chase experiments and tissue fractionation.
Main Results:
- Newly synthesized fibronectin is abundant in soluble fractions and incubation medium, primarily as dimers.
- Fibronectin is rapidly incorporated into the extracellular matrix within 1 hour.
- Medial smooth muscle cells are the major source of aortic fibronectin biosynthesis.
- Fibronectin biosynthesis and mRNA levels increase after preincubation.
Conclusions:
- Rabbit aortic rings are a viable model for studying vascular protein synthesis.
- This study provides insights into fibronectin biosynthesis and its regulation in aortic tissue.