Scalable and High-Throughput Production of an Injectable Platelet-Rich Plasma (PRP)/Cell-Laden Microcarrier/Hydrogel Composite System for Hair Follicle Tissue Engineering

This study developed a scalable and high-throughput method for producing an injectable composite system combining platelet-rich plasma (PRP), cell-laden microcarriers, and hydrogels for hair follicle (HF) tissue engineering. The system, tested both in vitro and in vivo, significantly enhanced dermal papilla cell (DPC) proliferation, migration, and HF regeneration. In vivo experiments on mice showed that PRP-loaded microcarriers accelerated hair cycle transition and increased new hair follicle formation, with ~35 HFs and ~12 vessels per site. The findings suggest that this composite system could be a promising approach for treating hair loss and promoting hair growth through sustained release of growth factors and a conducive microenvironment.