Deciphering cartilage neuro-immune interactions and innervation profile through 3D engineered osteoarthritic...

Area of Science:

• Biomedical Engineering
• Musculoskeletal Research
• Cell Biology

Background:

• Osteoarthritis (OA) involves cartilage degradation and inflammation, leading to nerve sprouting and pain.
• The exact mechanisms driving nerve growth into cartilage are not fully understood.
• Current models lack the ability to precisely monitor OA at the microscale.

Purpose of the Study:

• To create an in vitro model recapitulating OA pathophysiology, including sensory innervation.
• To develop a sensitive analytical tool for monitoring OA progression in microfluidic devices.
• To investigate neuro-immune interactions in cartilage disorders.

Main Methods:

• Engineered cartilage-like microtissues from primary human chondrocytes in hydrogels.
• Utilized microfluidic devices for construct patterning and pro-inflammatory triggering.
• Employed gene expression, functional assays, and EliChip™ technology for analysis.

Main Results:

• Constructs expressed key cartilage markers (collagen II, aggrecan, SOX-9, GAGs).
• Pro-inflammatory triggers recapitulated OA hallmarks, including chondrocyte catabolism and sensory innervation.
• EliChip™ quantitatively assessed cytokine profiles (IL-6, NGF) from microfluidic chips.

Conclusions:

• A miniaturized OA model was successfully developed using patient-derived cells and bioengineering.
• The model effectively mimics key OA features, including neuro-immune crosstalk.
• This platform serves as a novel tool for studying and monitoring cartilage-related disorders.