Effect of Internal Structure of Collagen/Hydroxyapatite Scaffold on the Osteogenic Differentiation of Mesenchymal Stem Cells
Consisting of seed cells and scaffold, regenerative medicine provides a new way for the repair
and regeneration of tissue and organ. Collagen/hydroxyapatite (HA) biocomposite scaffold is highlighted
due to its advantageous features of two major components of bone matrix: collagen and HA. The aim of this
study is to investigate the effect of internal structure of collagen/HA scaffold on the fate of rat mesenchymal stem cells
(MSCs). The internal structure of collagen/HA scaffold was characterized by micro-CT. It is found that the porosity decreased
while average compressive modulus increased with the increase of collagen proportion. Within the collagen proportion
of 0.35%, 0.5% and 0.7%, the porosities were 89.08%, 78.37% and 75.36%, the pore sizes were 140.6±75.5 μm,
133.9±48.4 μm and 160.7±119.6 μm, and the average compressive moduli were 6.74±1.16 kPa, 8.82±2.12 kPa and
23.61±8.06 kPa, respectively. Among these three kinds of scaffolds, MSCs on the Col 0.35/HA 22 scaffold have the highest
viability and the best cell proliferation. On the contrary, the Col 0.7/HA 22 scaffold has the best ability to stimulate
MSCs to differentiate into osteoblasts in a relatively short period of time. In vivo research also demonstrated that the internal
structure of collagen/HA scaffold has significant effect on the cell infiltration. Therefore, precise control of the internal
structure of collagen/HA scaffold can provide a more efficient carrier to the repair of bone defects.
Keywords: Bone tissue engineering, collagen/hydroxyapatite scaffold, differentiation, internal structure, mesenchymal stem cells.
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