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Changes in lung glycosaminoglycans during postresectional lung growth
1Department of Medicine, Duke University Medical Center, Durham, North Carolina.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|September 1, 1987
Summary
Compensatory lung growth after surgery involves significant early changes in glycosaminoglycans (GAGs). These GAG alterations, particularly hyaluronate and chondroitin sulfate, may facilitate lung tissue regeneration.
Area of Science:
- Pulmonary Medicine
- Biochemistry
- Regenerative Medicine
Background:
- Lung resection triggers compensatory growth in the remaining lung tissue.
- Glycosaminoglycans (GAGs) are crucial components of the extracellular matrix involved in tissue development and repair.
Purpose of the Study:
- To investigate the dynamic changes in GAG content and concentration during compensatory lung growth following surgical resection.
- To determine the specific GAG subtypes involved and their temporal patterns during lung regeneration.
Main Methods:
- Adult male rats underwent right lung trilobectomy.
- Left lung dry weight and GAG content (total and subtypes) were analyzed at various time points post-surgery (4 days, 7 days, and beyond).
- Gravimetric analysis and biochemical assays were employed to quantify GAGs.
Main Results:
- Left lung weight increased significantly between 4 and 7 days post-resection.
- Total GAG content per milligram dry lung weight rapidly increased by 189% at 4 days.
- Hyaluronate and chondroitin sulfate showed early, significant increases, while heparan sulfate increased gradually; dermatan sulfate remained unchanged.
Conclusions:
- Significant alterations in GAGs, particularly hyaluronate and chondroitin sulfate, occur early during compensatory lung growth.
- These GAG changes may play a facilitatory role in lung tissue regeneration after resection.