Shear-Induced CROSS (Cellular RedOx Spreading Shield) Assembly Sustains Neurotrophic Extracellular Vesicle Production...

Area of Science:

• Neuroscience
• Biotechnology
• Regenerative Medicine

Background:

• Stem cell-derived neuron-glia models are vital for brain research and therapeutics.
• Extracellular vesicles (EVs) from stem cells promote neural network formation but are vulnerable to oxidative stress during production.
• Oxidative stress compromises EV bioactivity and limits the reproducibility of neural models.

Purpose of the Study:

• To introduce a novel method to protect stem cell cultures from oxidative stress.
• To preserve the neurotrophic potential of extracellular vesicles (EVs) produced by stem cells.
• To enhance the development of functional neuron-glia networks for regenerative applications.

Main Methods:

• Development of the Cellular Redox Spreading Shield (CROSS), an antioxidant crystal-loaded microgel.
• Utilizing droplet microfluidics for CROSS assembly and application in mesenchymal stromal cell (MSC) cultures.
• Assessing EV neurotrophic content and bioactivity using calcium transient imaging and graph theory.

Main Results:

• CROSS sustained antioxidant activity for 6-7 days in stem cell cultures, mitigating oxidative stress propagation.
• CROSS-treated MSCs produced neurotrophic EVs enriched with microRNAs, enhancing neural stem cell differentiation.
• EVs from CROSS-treated MSCs promoted increased synaptic density and functional connectivity in neuron-glia networks.

Conclusions:

• The CROSS microgel effectively stabilizes the production of neurotrophic EVs by protecting stem cells from oxidative damage.
• This approach significantly improves the quality and efficacy of stem cell-derived EVs for neural tissue regeneration.
• CROSS technology holds broad implications for advancing biohybrid technologies and neural repair strategies.