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Injectable Polymeric Cytokine-Binding Nanowires Are Effective Tissue-Specific Immunomodulators.
Colin R Zamecnik1,2, Margaret M Lowe3, David M Patterson4
1Department of Bioengineering and Therapeutic Sciences, University of California , San Francisco, California 94158, United States.
ACS Nano
|November 11, 2017
Summary
Injectable nanowire matrices capture endogenous interleukin-2 (IL-2) to activate immune cells locally. This approach offers a non-surgical method for targeted immune modulation, showing promise for cytokine-mediated disease treatments.
Area of Science:
- Biomaterials Science
- Immunology
- Nanotechnology
Background:
- Injectable nanomaterials can complement cell transplantation and improve drug delivery compared to systemic therapies.
- Developing localized immune interactions without surgery is a key challenge in therapeutic strategies.
- Cytokines like interleukin-2 (IL-2) are crucial for immune cell activation but systemic delivery has limitations.
Purpose of the Study:
- To fabricate injectable, self-assembling nanomaterial matrices for localized immune engagement.
- To create polycaprolactone nanowires functionalized with antibodies to capture and potentiate endogenous IL-2.
- To evaluate the in vivo biocompatibility and immune-activating potential of these nanowire-antibody matrices.
Main Methods:
- Fabrication of high aspect ratio polycaprolactone nanowires using nanotemplating.
- Site-specific conjugation of cytokine-binding antibodies to nanowires via maleimide chemistry.
- Subcutaneous injection of nanowire-antibody matrices in vivo.
- Assessment of biocompatibility, inflammatory response, and immune cell activation (natural killer and T cells).
Main Results:
- Successfully fabricated tunable polycaprolactone nanowires that self-assemble into porous matrices upon injection.
- Nanowires demonstrated excellent in vivo biocompatibility with minimal inflammatory infiltrate.
- Antibody-conjugated nanowires effectively localized endogenous IL-2 in the subcutaneous space.
- The nanowire-antibody matrices activated specific natural killer and T cell subsets in a targeted manner.
Conclusions:
- Self-assembling injectable nanowire-antibody matrices can locally capture and present endogenous cytokines like IL-2.
- These matrices enable tissue- and cell-specific immune activation, offering a promising platform for localized immunotherapy.
- This technology represents a novel scaffold for engineered local receptor-ligand interactions in treating cytokine-mediated diseases.
