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Related Experiment Videos

Interactions between surface-bound actin and complement, platelets, and neutrophils.

Jonas Wetterö1, Agneta Askendal, Pentti Tengvall

  • 1Division of Applied Physics, Department of Physics and Measurement Technology, Biology and Chemistry, Linköping University, SE-581 83 Linköping, Sweden. jonwe@ifm.liu.se

Journal of Biomedical Materials Research. Part A
|July 2, 2003
PubMed
Summary

Actin immobilized on surfaces weakly activates complement, platelets, and neutrophils. However, polymerized actin (F-actin) on gold surfaces recruits platelets via complement factor C1q.

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Area of Science:

  • Biomaterials Science
  • Cell Biology
  • Immunology

Background:

  • Actin, crucial for cell shape and movement, is released during tissue injury.
  • Its role in biomaterial-associated inflammation is poorly understood.
  • Understanding actin's interaction with surfaces is vital for biomaterial development.

Purpose of the Study:

  • To investigate the inflammatory potential of immobilized actin on various surfaces.
  • To assess actin's effect on blood serum deposition, complement activation, and immune cell responses.
  • To determine if polymerized actin (F-actin) exhibits different interactions compared to globular actin (G-actin).

Main Methods:

  • Immobilization of G-actin onto methylated glass, silicon, and gold surfaces.
  • Polymerization of immobilized G-actin into F-actin using ions.

Related Experiment Videos

  • Analysis of serum deposition, complement activation (C1q), reactive oxygen species (ROS) generation, and immune cell (neutrophil, platelet) adhesion/aggregation using ellipsometry, chemiluminescence, aggregometry, and microscopy.

    • Main Results:

    • Actin formed stable G-actin and F-actin layers on surfaces.
    • F-actin bound low amounts of anti-C1q.
    • Actin-coated surfaces showed down-regulated cell responses (aggregation, spreading, ROS) similar to albumin.
    • F-actin on gold surfaces specifically recruited platelets in a C1q-dependent manner.

    Conclusions:

    • Adsorbed actin is a weak activator of complement, platelets, and neutrophils in vitro.
    • Polymerized actin (F-actin) can associate with complement factor C1q and recruit platelets, particularly on gold surfaces.
    • These findings offer insights into biomaterial-surface interactions and potential inflammatory responses.