Provided are a hydrogel
microsphere for constructing a bone
organoid, a kit, a bone
organoid, a bone
organoid-loaded hydrogel, and a preparation method therefor and the use thereof. The kit comprises (1) a gel
system and / or (2) a culture medium
system, and further comprises (3) a
phosphorus source and / or a
calcium source, wherein an addition amount of the
phosphorus source in the gel
system or culture medium system is 24000-33000 mg / L; and an addition amount of the
calcium source in the culture medium system is 2-8 mmol / L. The
calcium source and the
phosphorus source required for mineralization are introduced into a hydrogel and a culture matrix during the
in vitro culture of bone organoids. Without external assistance, only a single
cell type is used, along with simple
ionic calcium and phosphorus, and microspheres are used to regulate the
spatial distribution of calcium and phosphorus, which is beneficial to promoting cellular mineralization and osteogenesis. The in-situ mineralization method can effectively guide osteogenesis, mineralization,
cell layer formation, shaping and remodeling, promote the development of bone organoids, effectively shorten the bone repair cycle, and achieve greater safety and broader applicability.