Abstract:
:Bone matrix, mainly composed of type I collagen and apatite, is constantly modified during the bone remodeling process, which exposes bone cells to various proportions of mineralized collagen within bone structural units. Collagen-mineralized substrates have been shown to increase osteoblast activities. We hypothesized that such effects may be explained by a rapid secretion of specific growth factors and/or deposition of specific matrix proteins. Using MC3T3-E1 seeded for 32h on collagen substrates complexed with various apatite contents, we found that pre-osteoblasts in contact with mineralized collagen gave rise to a dose-dependent deposit of Vascular Endothelial Growth Factor-A (VEGF-A) and RGD-containing proteins such as osteopontin (OPN) and fibronectin (FN). This RGD-matrix deposition reinforced the cell adhesion to collagen-mineralized substrates. It was also observed that, on these substrates, this matrix was elaborated concomitantly to an increased cell migration, allowing a homogeneous coverage of the sample. This particular surface activation was probably done firstly to reinforce cell survival (VEGF-A) and adhesion (OPN, FN) and secondly to recruit and prepare surfaces for subsequent bone cell activity.
journal_name
Bonejournal_title
Boneauthors
Perrier A,Dumas V,Linossier MT,Fournier C,Jurdic P,Rattner A,Vico L,Guignandon Adoi
10.1016/j.bone.2010.03.010subject
Has Abstractpub_date
2010-07-01 00:00:00pages
23-33issue
1eissn
8756-3282issn
1873-2763pii
S8756-3282(10)00503-Xjournal_volume
47pub_type
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