Anticoagulant effects of sulphonated polyisoprenes

Area of Science:

• Polymer Chemistry
• Biochemistry
• Hematology

Background:

• Anticoagulant therapies are crucial for managing thrombotic disorders.
• Developing novel anticoagulants with predictable efficacy and safety profiles remains an active research area.
• Polyisoprenes, modified with sulphonate groups, represent a potential class of anticoagulant agents.

Purpose of the Study:

• To synthesize sulphonated polyisoprenes (SPIPs) with varying molecular weights and sulphonate group contents.
• To investigate the anticoagulant activities of these synthesized SPIPs in vitro.
• To elucidate the relationship between SPIP structural characteristics and their anticoagulant potency.

Main Methods:

• Synthesis of sulphonated polyisoprenes (SPIPs) with controlled molecular weights and degrees of sulphonation.
• In vitro assessment of anticoagulant activity using assays such as blood clotting time, prothrombin time, and activated partial thromboplastin time.
• Evaluation of thrombin time in the presence of sufficient thrombin to assess potential fibrinogen-SPIP interactions.

Main Results:

• SPIPs were successfully synthesized with diverse molecular weights and sulphonate group concentrations.
• The presence of SPIPs significantly prolonged blood clotting time, prothrombin time, and activated partial thromboplastin time.
• Anticoagulant activity was predominantly influenced by the total sulphonate group concentration, with molecular weight also playing a role.
• Prolongation of thrombin time suggested potential interactions between SPIPs and fibrinogen, contributing to the anticoagulant effect.

Conclusions:

• Sulphonated polyisoprenes exhibit significant anticoagulant activity.
• The anticoagulant potency of SPIPs is primarily determined by their sulphonate group concentration and, to a lesser extent, their molecular weight.
• Interactions with fibrinogen are a likely mechanism underlying the anticoagulant effects of SPIPs.