Current bone biomolecules can be divided into two categories, collagen fragments released from the bone matrix during resorption (degradation); and enzymes released from either osteoblasts or osteoclasts.
In addition, factors such as TGF-β and IGFs that are released from the bone matrix during degradation serve to increase PTHrP expression in breast cancer cells.
The mechanisms regulating this coupling are not entirely clear but it is thought that growth factors mobilized from the bone matrix during resorption might contribute to intercellular signaling and subsequent stimulation of bone formation.
Taken together, these findings suggest that PTHrP may regulate the mineralization of bone matrix during skeletal morphogenesis.
The carboxylated form has high affinity to the hydroxyapatite crystals, remaining into bone matrix during its mineralization.
The undercarboxylated form shows lower affinity to minerals, due to acidification of bone matrix during osteoclast bone resorption, and then it is ferried by the bloodstream, reaching other organs [ 204, 205].
These growth factors can be synthesized and stored in bone matrix during bone formation, released during bone resorption and affect bone remodeling [ 21, 44].
They speculated that the region of lower Pb concentration has lower blood flow in the Haversian canals and, consequently, less Pb available for uptake into bone matrix during bone remodeling (Todd et al. 2001).
In a cohort of 20 tibial nonunions, bone marrow was aspirated (average volume range of 100 to 150 mL) from the posterior iliac crest under general anesthesia and delivered to the fracture site either via a percutaneous injection under radiographic guidance or as a paste mixed with demineralized bone matrix during an open procedure.
Therefore, the present study was designed to identify the expression pattern of vascular endothelial growth factor (VEGF) in the presence of bFGF reconstituted in demineralized intramembranous bone matrix (DBMIM) during the healing of allogeneic bone grafts.
