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Complement activation on thiol-modified gold surfaces

L Liu1, H Elwing

  • 1Department of General and Marine Microbiology, Göteborg University, Sweden.

Journal of Biomedical Materials Research
|April 1, 1996
PubMed
Summary
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Mercaptoglycerol (MG) surfaces strongly activate complement, unlike mercaptopropionic acid (MPA) or gold surfaces. Hydroxyl groups on MG surfaces likely drive alternative pathway complement activation.

Area of Science:

  • Biomaterials Science
  • Immunology
  • Surface Chemistry

Background:

  • Complement activation is crucial in immune responses and biomaterial interactions.
  • Understanding surface properties that influence complement activation is vital for biomaterial design.

Purpose of the Study:

  • To investigate the impact of protein adsorption and surface chemical composition on complement activation.
  • To compare complement activation on mercaptoglycerol (MG) and mercaptopropionic acid (MPA) modified gold surfaces.

Main Methods:

  • Utilized modified gold surfaces (MG and MPA) as model systems.
  • Measured fluid phase complement components (iC3b, C5b-9) in serum.
  • Quantified surface-bound active C3 deposition using ellipsometry.

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Main Results:

  • MG surfaces induced significant iC3b and C5b-9 production and C3 deposition.
  • Bare gold and MPA surfaces showed minimal complement activation.
  • MG surfaces exhibited high immunoglobulin G (IgG) affinity, potentially contributing to complement activation.
  • Evidence suggests alternative pathway activation on MG surfaces, particularly at high serum concentrations, linked to hydroxyl groups.

Conclusions:

  • Surface chemistry, specifically the presence of hydroxyl groups on MG surfaces, plays a critical role in initiating complement activation.
  • MG surfaces promote both classical and alternative complement pathways, depending on serum concentration.
  • Surface properties significantly influence immune responses, impacting biomaterial performance.