This invention discloses a method for inducing pluripotent stem cells to differentiate into
skin keratinocytes and its culture medium, solving problems such as long differentiation cycles, low yields, insufficient purity, and animal-derived
contamination in existing technologies. The first stage uses medium I containing FGF2 and
tanshinone IIA to promote mesodermal differentiation. The second stage uses medium II containing BMP4, EGF,
dexamethasone, and PVA to regulate and synergistically induce the BMP /
ERK signaling pathway. The final stage uses medium III for expansion culture, obtaining fibroblasts with a purity >99% within 20 days. This method is non-invasive, simple, and low-cost, with potential for large-scale production. The obtained cells can be used for
skin regeneration,
disease modeling,
drug screening, and
clinical treatment, demonstrating significant medical application and industrial transformation value.