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Proteoglycan obtained from bovine aorta suppress thrombin-induced platelet aggregation
Y Nakashima1, T Matsushima, T Sadayasu
1Second Department of Internal Medicine, University of Occupational and Environmental Health Japan, School of Medicine, Kitakyushu.
Artery
|January 1, 1992
Summary
Bovine aorta proteoglycan (PG) inhibits thrombin-induced platelet aggregation, likely by inactivating plasma thrombin. This effect is primarily attributed to its dermatan sulfate (DS) and heparan sulfate (HS) components.
Area of Science:
- Biochemistry
- Vascular Biology
- Platelet Physiology
Background:
- Proteoglycans (PG) are crucial components of the extracellular matrix in blood vessels.
- Platelet aggregation plays a key role in hemostasis and thrombosis.
Purpose of the Study:
- To investigate the effect of bovine aorta proteoglycan (PG) on platelet aggregation.
- To identify the specific glycosaminoglycan (GAG) components responsible for PG's effect on platelet aggregation.
Main Methods:
- Isolation and purification of PG from bovine aorta intima-media.
- Assessment of PG's effect on platelet aggregation induced by various agonists (ADP, collagen, epinephrine, thrombin).
- Evaluation of the impact of papain digestion on PG's anti-aggregatory activity.
Main Results:
- PG inhibited thrombin-induced platelet aggregation but not aggregation induced by ADP, collagen, or epinephrine.
- Hyaluronic acid (HA) and chondroitin 4/6-sulfate (CS 4/6-S) showed minimal inhibition of thrombin-induced aggregation.
- The anti-aggregatory effect of PG was reduced after papain digestion, suggesting GAG involvement.
Conclusions:
- Bovine aorta PG inactivates plasma thrombin, likely by modulating thrombin activators or potentiating inactivating substances.
- The inhibitory effect of PG on thrombin-induced platelet aggregation is mainly attributed to its dermatan sulfate (DS) and partly to its heparan sulfate (HS) components.