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Design principles for cytokine-neutralizing gels: Cross-linking effects.
Liang Tso Sun1, Sidi A Bencherif, Thomas W Gilbert
1Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
Acta Biomaterialia
|July 6, 2010
Summary
Non-crosslinked hyaluronic acid-antibody conjugates effectively reduce inflammation by controlling cytokine diffusion. Crosslinked versions are less effective, highlighting the importance of material design for anti-inflammatory biomaterials.
Area of Science:
- Biomaterials Science
- Immunology
- Tissue Engineering
Background:
- Cytokine-neutralizing antibodies conjugated to hyaluronic acid (HA) show anti-inflammatory effects.
- Developing HA-based biomaterials for tissue engineering requires understanding their inflammation-controlling capabilities.
Purpose of the Study:
- To investigate if crosslinked HA-antibody conjugates retain anti-inflammatory properties compared to non-crosslinked forms.
- To explore the impact of material structure on controlling pro-inflammatory cytokines in vivo.
Main Methods:
- Conjugation of high-molecular-weight HA with antibodies against interleukin-1β and tumor necrosis factor-α.
- Creation of both non-crosslinked (viscous) and crosslinked (elastomeric) conjugate forms.
- In vivo subcutaneous implantation in Sprague-Dawley rats to assess inflammatory markers.
Main Results:
- Both non-crosslinked and crosslinked constructs bind cytokines in vitro.
- Only non-crosslinked HA-antibody conjugates significantly reduced acute inflammation markers in vivo.
- Crosslinked materials showed reduced efficacy in sequestering pro-inflammatory cytokines within relevant biological timescales.
Conclusions:
- Material design, specifically the crosslinking of HA-antibody conjugates, critically influences in vivo anti-inflammatory function.
- Non-crosslinked HA-antibody conjugates control inflammation by retarding cytokine diffusion in the extracellular matrix.
- Transport phenomena are key considerations for developing effective cytokine-regulating biomaterials.
