Reduced thrombogenicity of polymers having phospholipid polar groups

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Hemocompatibility Studies

Background:

• Thrombogenicity of synthetic polymers remains a challenge for biomedical devices.
• Phospholipid polar groups are known to improve biocompatibility.
• Poly(n-butyl methacrylate) (BMA) serves as a baseline polymer for comparison.

Purpose of the Study:

• To evaluate the thrombogenicity of poly(2-methacryloyloxyethyl phosphorylcholine) (MPC)-co-n-butyl methacrylate (BMA) copolymers.
• To investigate the effect of MPC content on platelet activation and adhesion.
• To determine the role of MPC moieties in reducing polymer thrombogenicity.

Main Methods:

• Microsphere-column method was employed for thrombogenicity evaluation.
• Contact of polymers with platelet-rich plasma (PRP) under different conditions (citrated and Ca2(+)-re-added).
• Assessment of platelet adhesion, aggregation, and fibrin formation on polymer surfaces.

Main Results:

• Poly(BMA) showed significant platelet adhesion and aggregation.
• Increasing MPC composition in poly(MPC-co-BMA) reduced platelet adhesion, deformation, and aggregation.
• Complete suppression of platelet activation and fibrin formation was observed with 0.320 mole fraction of MPC.

Conclusions:

• MPC moieties are critical for reducing the thrombogenicity of poly(MPC-co-BMA) copolymers.
• The developed polymers demonstrate excellent hemocompatibility.
• These findings highlight the potential of MPC-containing polymers for blood-contacting applications.