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Heparinase inhibits neovascularization
R Sasisekharan1, M A Moses, M A Nugent
1Harvard-Massachusetts Institute of Technology, Division of Health Sciences and Technology, Cambridge, MA 02139.
Summary
Heparinases I and III inhibit neovascularization and endothelial cell proliferation by depleting heparan sulfate receptors. This suggests a novel therapeutic target for controlling angiogenesis and related conditions.
Area of Science:
- Biochemistry
- Cell Biology
- Angiogenesis Research
Background:
- Neovascularization is crucial for tissue development, wound healing, and tumor metastasis.
- Heparin-like molecules' role in neovascularization is studied, but heparin-degrading enzymes' roles are less understood.
Purpose of the Study:
- To investigate the role of heparin-degrading enzymes (heparinases) in neovascularization.
- To determine the specific effects of heparinases I, II, and III on endothelial cell proliferation and in vivo neovascularization.
Main Methods:
- In vivo neovascularization assays.
- In vitro proliferation assays of capillary endothelial cells using basic fibroblast growth factor.
- Enzymatic activity assays of heparinases I, II, and III.
Main Results:
- Heparinases I and III significantly inhibited neovascularization in vivo and endothelial cell proliferation in vitro.
- Heparinase II did not show significant inhibitory effects.
- Inhibition is proposed to occur via depletion of heparan sulfate receptors essential for growth factor signaling.
Conclusions:
- Heparinases I and III play an inhibitory role in neovascularization and endothelial cell proliferation.
- The differential effects of heparinases may relate to substrate specificity and modulation of heparin-binding cytokines.
- Heparan sulfate proteoglycans are critical for growth factor-mediated angiogenesis, and their degradation by specific heparinases can inhibit this process.