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Fetal lung fibroblasts selectively down-regulate proteoglycan synthesis in response to elevated oxygen
I Caniggia1, J Liu, M Kuliszewski
1Medical Research Council Group in Lung Development, Department of Paediatrics, Hospital for Sick Children Research Institute, University of Toronto, Ontario M5G 1X8, Canada.
The Journal of Biological Chemistry
|March 22, 1996
Summary
High oxygen levels reduce glycosaminoglycan (GAG) and proteoglycan (PG) synthesis in fetal lung fibroblasts. This effect is reversible, suggesting oxygen
Area of Science:
- Cell Biology
- Biochemistry
- Extracellular Matrix Research
Background:
- Extracellular matrix (ECM) components regulate cell proliferation.
- Elevated oxygen (O2) may influence lung fibroblast growth by altering ECM.
- Investigating O2 effects on ECM synthesis in fetal lung fibroblasts is crucial.
Purpose of the Study:
- To determine the impact of elevated O2 on glycosaminoglycan (GAG) and proteoglycan (PG) synthesis in fetal lung fibroblasts.
- To analyze the reversibility of O2-induced changes in ECM component synthesis.
Main Methods:
- Fetal lung fibroblasts were exposed to elevated O2 concentrations (>/=50%).
- Incorporation of [3H]glucosamine and 35SO4 was measured to assess GAG synthesis.
- mRNA expression for specific ECM proteins (biglycan, versican, collagen I, fibronectin) was analyzed.
Main Results:
- Elevated O2 significantly reduced GAG and PG synthesis, including biglycan and membrane/matrix-associated PGs.
- mRNA levels for biglycan and versican decreased, while type I collagen and fibronectin mRNA increased.
- Re-incubation in 3% O2 reversed the inhibitory effects on biglycan and partially on collagen I.
Conclusions:
- Fetal lung fibroblasts selectively down-regulate GAG and PG synthesis under elevated O2 conditions.
- This O2-induced modulation of ECM synthesis is reversible.
- Findings highlight the sensitivity of lung fibroblast ECM production to oxygen levels.