part of part of develops from mesodermal cell migratory neural crest cell bone cell connective tissue cell preosteoblast 2012-06-27T10:57:21Z Preosteoblast is a critical cell type involved in bone formation, crucial in a process known as ossification or osteogenesis. They are derived from mesenchymal stem cells and are an intermediate stage marking the transition from an osteoprogenitor cell to a fully differentiated osteoblast. The presence of preosteoblasts signifies the site of new bone deposition, highlighting their crucial role in skeletal development and in response to bone injury repairs. The primary function of preosteoblasts is to differentiate into osteoblasts, which are responsible for secreting osteoid (the unmineralized portion of bone matrix) and regulating the process of bone mineralization. Preosteoblasts are regulated by various growth factors and hormones, including bone morphogenic proteins (BMPs), fibroblast growth factors (FGFs), parathyroid hormone (PTH) and Vitamin D. However, the function of preosteoblasts is not limited to bone formation alone. In addition to osteogenesis, preosteoblasts significantly contribute to the maintenance of bone homeostasis through regulating the activity of osteoclasts - the cells responsible for bone resorption. This regulation is mediated through RANK/RANKL/OPG pathway signaling. Osteoprotegerin (OPG) released from the preosteoblasts acts as a decoy receptor for RANKL impairing osteoclast formation, hence preventing excessive bone resorption. This regulatory role indicates the dual functionality of preosteoblasts, which are indispensable for both the formation of new bone and the maintenance of existing bone tissue. (This extended description was generated by ChatGPT and reviewed by the CellGuide team, who added references, and by the CL editors, who approved it for inclusion in CL. It may contain information that applies only to some subtypes and species, and so should not be considered definitional.) https://cellxgene.cziscience.com/cellguide/CL_0007010 Skeletogenic cell that has the potential to transform into an osteoblast, and develops from neural crest or mesodermal cells. osteoprogenitor cell progenitor cell osteoid