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A Dual-layered Microfluidic System for Long-term Controlled In Situ Delivery of Multiple Anti-inflammatory Factors for Chronic Neural Applications
- Source :
- Adv Funct Mater
- Publication Year :
- 2020
-
Abstract
- We report the development of a microfluidic system capable of repeated infusions of anti-inflammatory factors post-implantation for use as a coating for neural probes. This system consists of a microchannel in a thin gelatin methacryloyl (GelMA)-polyethylene glycol (PEG) composite hydrogel surrounded by a porous polydimethylsiloxane (PDMS) membrane, where the hydrogel can be dried to increase the stiffness for easy insertion. Reswelling allowed us to perfuse interleukin (IL)-4 and dexamethasone (DEX) as anti-inflammatory factors through the channel with minimal burst release and significant amounts of IL-4 were observed to release for up to 96 hr post-infusion. Repeated injections of IL-4 increased the ratio of prohealing M2 versus proinflammatory M1 phenotypes of macrophages encapsulated in the hydrogel by six fold compared with a single injection, over a 2-week period. These repeated infusions also significantly downregulated the expression of inflammatory markers tumor necrosis factor (TNF)-α and IL-6 in astrocytes encapsulated in hydrogel. To demonstrate the system as a coating of neural probe for in vivo applications, we further fabricated a prototype device, where a thin dual-layered microfluidic system was integrated onto a metal probe. Such a drug delivery system could help reduce the formation of a glial scar around neural probes.
- Subjects :
- 0301 basic medicine
food.ingredient
Materials science
Nanotechnology
02 engineering and technology
Gelatin
Article
Glial scar
Proinflammatory cytokine
Biomaterials
03 medical and health sciences
chemistry.chemical_compound
food
In vivo
PEG ratio
Electrochemistry
Polydimethylsiloxane
technology, industry, and agriculture
021001 nanoscience & nanotechnology
Condensed Matter Physics
Electronic, Optical and Magnetic Materials
030104 developmental biology
chemistry
Drug delivery
Self-healing hydrogels
0210 nano-technology
Biomedical engineering
Subjects
Details
- ISSN :
- 1616301X
- Volume :
- 28
- Issue :
- 12
- Database :
- OpenAIRE
- Journal :
- Advanced functional materials
- Accession number :
- edsair.doi.dedup.....4e5e1d33f0f93defa325235d26556111