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Modulation of Macrophages Differentiation by Nanoscale-Engineered Geometric and Chemical Features
A Bachhuka1,2, R Madathiparambil Visalakshan3, C S Law1,2,4
1ARC Center of Excellence for Nanoscale BioPhotonics (CNBP), The University of Adelaide, Adelaide, South Australia 5005, Australia.
ACS Applied Bio Materials
|January 13, 2022
Summary
Biomaterial surface nanotopography and chemistry guide macrophage differentiation. Tailor-engineered surfaces promote M2 (healing) phenotypes, reducing inflammation for improved implant outcomes.
Area of Science:
- Biomaterials Science
- Cell Biology
- Surface Chemistry
Background:
- Macrophage differentiation into M1 (inflammatory) and M2 (healing) phenotypes influences biomaterial fate.
- Extracellular matrix biophysical properties affect macrophage behavior.
- Biomaterial constructs with engineered nanotopography and chemistry are of increasing interest.
Purpose of the Study:
- Investigate the combined effects of surface nanotopography and chemistry on macrophage differentiation.
- Address the knowledge gap regarding the synergistic role of surface properties.
- Develop strategies to tune inflammatory responses for better biomaterial implants.
Main Methods:
- Fabrication of nanoporous surfaces with controlled pore sizes (30, 65, 200 nm) and lateral spacing.
- Tailoring outermost surface chemistry with amine (NH2), carboxyl (COOH-), and hydrocarbon (CH3-) functionalities.
- Assessing macrophage differentiation and cytokine profiles on modified surfaces.
Main Results:
- Combinatorial effects of surface properties direct macrophage differentiation towards the M2 (healing) phenotype.
- Optimal M2 polarization observed on surfaces with 200 nm nanopores and -COOH functionality.
- Significant decrease in pro-inflammatory cytokines and a marked increase in anti-inflammatory cytokines observed.
Conclusions:
- Surface nanotopography and chemistry synergistically modulate macrophage responses.
- Tailor-engineered biomaterial surfaces can reduce inflammatory and foreign body responses.
- Findings provide a pathway for designing improved biomaterial implants with enhanced clinical outcomes.
