Microfluidic generation of alginate microbeads containing in situ-formed apical papilla stem cell spheroids and NecroX-5-loaded nanoparticles

A continuous single-emulsion microfluidic method forms SCAP spheroids inside ~275 µm alginate microbeads, producing ~80 µm spheroids in ultra-soft ~150 Pa beads that remain retrievable.

• Why it matters: MSC spheroids can improve function, but transplanted cells are rapidly cleared, limiting efficacy. Encapsulating spheroids in hydrogel microbeads aims to protect viability and preserve immunomodulatory activity.
• What they did: They generated spheroids in situ overnight within alginate droplets using a microfluidic single-emulsion protocol, then cross-linked and retrieved beads. They also optimized hybrid beads by loading nanomedicines with NecroX-5 into the alginate before droplet formation.
• The result: Encapsulated SCAP spheroids retained immunomodulatory properties, and Live/Dead assays showed a protective effect from NecroX-5-loaded nanomedicines, supporting improved SCAP viability for regenerative delivery.

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