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Related Experiment Videos

Study of complement activation on well-defined surfaces using surface plasmon resonance.

Hirata1, Morimoto, Murakami

  • 1Institute for Frontier Medical Sciences, Kyoto University, 53 Kawahara-cho, Shogoin, Sakyo-ku, 606-8507, Kyoto, Japan

Colloids and Surfaces. B, Biointerfaces
|August 1, 2000
PubMed
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Total Synthesis of (+)-Eurylene and (+)-14-Deacetyleurylene We thank K. Ujihara (Sumitomo Chemical Co.) for generously supplying an authentic sample and a copy of the (1)H NMR spectrum of synthetic eurylene. We are grateful to Prof. H. Iio and Dr. Y. Usuki (Osaka City University) for the HPLC purification. T.I. thanks the Japan Society for the Promotion of Science for providing a JSPS Research Fellowship for Young Scientists. This research was supported by the Naito Foundation, the Fujisawa Pharmaceutical Award in Synthetic Organic Chemistry, Japan, the SUNBOR GRANT from the Suntory Institute for Bioorganic Research, and a Grant-in Aid for Encouragement of JSPS Research Fellows from the Japan Society for the Promotion of Science.

Angewandte Chemie (International ed. in English)·2000

Covalent immobilization of complement protein C3b on hydroxylated surfaces initiates complement activation via the alternative pathway. Hydrophobic surfaces showed limited alternative pathway activation, highlighting surface chemistry's role in complement interactions.

Area of Science:

  • Biomaterials Science
  • Immunology
  • Surface Chemistry

Background:

  • Covalent immobilization of complement protein C3b is crucial for initiating complement activation on artificial materials.
  • Direct evidence for C3b covalent immobilization on artificial surfaces remains limited.
  • Understanding surface interactions is key for developing biocompatible materials.

Purpose of the Study:

  • To investigate the role of surface functional groups in complement activation.
  • To demonstrate covalent immobilization of C3b on model surfaces.
  • To elucidate the pathways of complement activation initiated by immobilized C3b.

Main Methods:

  • Preparation of model surfaces using self-assembled monolayers (SAMs) with hydroxyl (OH-SAM) and methyl (CH(3)-SAM) groups.

Related Experiment Videos

  • Utilizing surface plasmon resonance (SPR) to study complement system interactions.
  • Assessing complement activation pathways (classical and alternative) in different buffer conditions.

    • Main Results:

    • The OH-SAM surface successfully immobilized C3b and activated the complement system via the alternative pathway in standard buffer.
    • The OH-SAM surface did not activate the classical pathway.
    • Alternative pathway activation on OH-SAM was inhibited in the presence of EGTA and MgCl(2).
    • The hydrophobic CH(3)-SAM surface showed limited alternative pathway activation and no classical pathway activation.

    Conclusions:

    • Surface chemistry, specifically the presence of hydroxyl groups, is critical for effective C3b immobilization and subsequent alternative pathway complement activation.
    • The findings provide direct evidence for C3b immobilization and its role in initiating complement cascades on engineered surfaces.
    • This research offers insights into designing biomaterials with controlled complement interactions.