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Interaction of poly(2-acrylamido 2-methylpropane sulfonate)-grafted polystyrene beads with cationic complement
Y Murakami1, H Iwata, E Kitano
1Institute for Frontier Medical Sciences, Kyoto University, Japan.
Journal of Biomaterials Science. Polymer Edition
|July 5, 2001
Summary
Poly(2-acrylamido 2-methylpropane sulfonate) grafted on polystyrene beads (PAMPS-g-beads) adsorb complement proteins from serum without activation. This suggests PAMPS-g-beads can be used to remove excess factor D in renal failure patients.
Area of Science:
- Biomaterials Science
- Immunology
- Biochemistry
Background:
- Biomaterial interactions with the complement system are critical for preventing adverse reactions like inflammation.
- Developing non-complement-activating biomaterials is essential for clinical applications.
Purpose of the Study:
- To investigate the interaction between anionic poly(2-acrylamido 2-methylpropane sulfonate) grafted on polystyrene beads (PAMPS-g-beads) and human serum complement.
- To determine if PAMPS-g-beads activate or adsorb complement components.
Main Methods:
- Complement activity assays (CH50).
- Quantification of complement protein levels in serum.
- Immunoblot analysis to detect complement component adsorption and activation fragments.
Main Results:
- PAMPS-g-beads adsorbed complement proteins C1q, factor D, factor P, C6, and C8 from serum.
- No complement activation fragments were generated, indicating no complement activation.
- Factor D was most effectively removed, potentially inhibiting the alternative pathway.
- Significant amounts of PAMPS-g-beads were required to reduce serum CH50 levels, likely due to C6 removal.
Conclusions:
- PAMPS-g-beads do not activate the complement system but act as adsorbents for complement components.
- The adsorption of factor D suggests a potential therapeutic application for renal failure patients with high factor D levels.
- Extracorporeal treatment using PAMPS-g-beads could mitigate pathological complement activation.