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Gangliosides promote the angiogenic response
M Ziche1, G Alessandri, P M Gullino
1Department of Preclinical and Clinical Pharmacology, University of Florence, Italy.
Summary
Gangliosides promote new capillary formation in rabbit corneas, enhancing growth and density when combined with suboptimal doses of angiogenic inducers like prostaglandin E1 (PGE1). Their removal halts angiogenesis, suggesting a role in vessel morphogenesis.
Area of Science:
- Ophthalmology
- Angiogenesis Research
- Cell Biology
Background:
- Capillary formation (angiogenesis) is crucial for tissue repair and pathological processes.
- Prostaglandin E1 (PGE1) and basic fibroblastic growth factor are known inducers of angiogenesis.
- The role of gangliosides in modulating angiogenesis requires further elucidation.
Purpose of the Study:
- To investigate the effect of gangliosides (GM1, GT1b) on corneal angiogenesis induced by suboptimal doses of PGE1 or basic fibroblastic growth factor.
- To determine if gangliosides act as angiogenic inducers or promoters.
- To explore the potential clinical relevance of gangliosides in angiogenesis-dependent diseases.
Main Methods:
- Induction of corneal angiogenesis in rabbits using PGE1 or basic fibroblastic growth factor.
- Administration of varying doses of gangliosides (GM1, GT1b) in conjunction with angiogenic inducers.
- Assessment of neovascularization, capillary number, and growth rate.
- Evaluation of ganglioside function after removal of sialic acid and ganglioside stimulation.
Main Results:
- Suboptimal doses of PGE1 or basic fibroblastic growth factor failed to induce significant corneal angiogenesis.
- Gangliosides (GM1, GT1b) significantly enhanced neovascularization and capillary growth when added to suboptimal inducer doses.
- Ganglioside stimulation was reversible, with removal leading to capillary regression and re-establishment promoting renewed growth.
- Sialic acid removal from gangliosides abolished their pro-angiogenic effect; gangliosides alone were not angiogenic.
- Corneas undergoing angiogenesis showed doubled ganglioside content compared to unstimulated corneas.
Conclusions:
- Gangliosides act as potent promoters of vessel morphogenesis, not as primary inducers of angiogenesis.
- Tissue ganglioside levels may significantly influence pathological processes involving neovascularization.
- Gangliosides represent a potential therapeutic target for modulating angiogenesis in various clinical conditions.