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Lung hyaluronan as assayed with a biotinylated hyaluronan-binding protein
1Department of Medicine, Columbia University College of Physicians and Surgeons, New York, New York.
Experimental Lung Research
|July 1, 1994
Summary
This study reveals how hyaluronan (HA) binds in lung tissue, finding most HA is soluble and available for functions like water transport. Some HA may be bound to other lung components, influencing its availability.
Area of Science:
- Biochemistry
- Pulmonary Biology
- Extracellular Matrix Research
Background:
- Hyaluronan (HA) is a crucial glycosaminoglycan in lung tissue.
- Understanding HA binding is essential for pulmonary function and disease research.
Purpose of the Study:
- To investigate the binding characteristics and solubility of hyaluronan in lung tissue.
- To determine the accessibility of lung hyaluronan for biological functions.
Main Methods:
- Extraction of lyophilized hamster lungs using associative (0.5 M NaCl) and dissociative (4 M guanidine HCl) conditions, and water.
- Pronase digestion of lung tissue in different buffer systems (PBS, Tris).
- Quantification of solubilized HA using a biotinylated HA-binding protein (B-HABP) inhibition assay.
Main Results:
- Over 80% of lung HA was solubilized by single extractions with 0.5 M NaCl or 4 M guanidine HCl.
- Two brief water washes solubilized nearly half of the total lung HA.
- Pronase digestion in dilute Tris buffer indicated that 52% of solubilized HA was bound to other lung components and unavailable to B-HABP.
Conclusions:
- Lung hyaluronan is predominantly soluble and readily accessible.
- A portion of lung HA may be bound to other tissue components, affecting its availability.
- Soluble lung HA likely plays roles in water transport and protecting connective tissue fibers.
