Enhanced integrin-mediated human osteoblastic adhesion to porous amorphous calcium phosphate/poly（L-lactic acid） composite
Background The initial osteoblastic adhesion to materials characterizes the first phase of cell-material interactions and influences all the events leading to the formation of new bone. In a previous work, we developed a novel amorphous calcium phosphate （ACP）/poly（L-lactic acid） （PLLA） material tha...
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| Published in: | 中华医学杂志：英文版 no. 19; pp. 3443 - 3448 |
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| Main Author: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2014
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| Subjects: | |
| Online Access: | Get full text |
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| Summary: | Background The initial osteoblastic adhesion to materials characterizes the first phase of cell-material interactions and influences all the events leading to the formation of new bone. In a previous work, we developed a novel amorphous calcium phosphate （ACP）/poly（L-lactic acid） （PLLA） material that demonstrated morphologic variations in its microstructure. The aim of this study was to investigate the initial interaction between this material and osteoblastic cells. Cellular attachment and the corresponding signal transduction pathways were investigated. Methods A porous ACP/PLLA composite and PLLA scaffold （as a control） were incubated in fetal bovine serum （FBS） containing phosphate-buffered saline （PBS）, and the protein adsorption was determined. Osteoblastic MG63 cells were seeded on the materials and cultured for 1, 4, 8, or 24 hours. Cell attachment was evaluated using the MTS method. Cell morphology was examined using scanning electron microscopy （SEM）. The expression levels of the genes encoding integrin subunits αl, α5, αv, β1, focal adhesion kinase （FAK）, and glyceraldehyde-3-phosphate dehydrogenase （GAPDH） were determined using real-time reverse transcription polymerase chain reaction （RT-PCR）. Results The ACP/PLLA material significantly increased the protein adsorption by 6.4-fold at 1 hour and 2.4-fold at 24 hours, compared with the pure PLLA scaffold. The attachment of osteoblastic cells to the ACP/PLLA was significantly higher than that on the PLLA scaffold. The SEM observation revealed a polygonal spread shape of cells on the ACP/ PLLA, with the filopodia adhered to the scaffold surface. In contrast, the cells on the PLLA scaffold exhibited a spherical or polygonal morphology. Additionally, real-time RT-PCR showed that the genes encoding the integrin subunits αl, αv, β1, and FAK were expressed at higher levels on the ACP/PLLA composite. Conclusions The ACP/PLLA composite promoted protein adsorption and osteoblastic adhesion. The enhanced cell adhesion may be mediated by the binding of integrin subunits αl, αv, and β1, and subsequently may be regulated through the FAK signal transduction pathways. |
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| Bibliography: | amorphous calcium phosphate; osteoblast; cell adhesion; integrin 11-2154/R Background The initial osteoblastic adhesion to materials characterizes the first phase of cell-material interactions and influences all the events leading to the formation of new bone. In a previous work, we developed a novel amorphous calcium phosphate （ACP）/poly（L-lactic acid） （PLLA） material that demonstrated morphologic variations in its microstructure. The aim of this study was to investigate the initial interaction between this material and osteoblastic cells. Cellular attachment and the corresponding signal transduction pathways were investigated. Methods A porous ACP/PLLA composite and PLLA scaffold （as a control） were incubated in fetal bovine serum （FBS） containing phosphate-buffered saline （PBS）, and the protein adsorption was determined. Osteoblastic MG63 cells were seeded on the materials and cultured for 1, 4, 8, or 24 hours. Cell attachment was evaluated using the MTS method. Cell morphology was examined using scanning electron microscopy （SEM）. The expression levels of the genes encoding integrin subunits αl, α5, αv, β1, focal adhesion kinase （FAK）, and glyceraldehyde-3-phosphate dehydrogenase （GAPDH） were determined using real-time reverse transcription polymerase chain reaction （RT-PCR）. Results The ACP/PLLA material significantly increased the protein adsorption by 6.4-fold at 1 hour and 2.4-fold at 24 hours, compared with the pure PLLA scaffold. The attachment of osteoblastic cells to the ACP/PLLA was significantly higher than that on the PLLA scaffold. The SEM observation revealed a polygonal spread shape of cells on the ACP/ PLLA, with the filopodia adhered to the scaffold surface. In contrast, the cells on the PLLA scaffold exhibited a spherical or polygonal morphology. Additionally, real-time RT-PCR showed that the genes encoding the integrin subunits αl, αv, β1, and FAK were expressed at higher levels on the ACP/PLLA composite. Conclusions The ACP/PLLA composite promoted protein adsorption and osteoblastic adhesion. The enhanced cell adhesion may be mediated by the binding of integrin subunits αl, αv, and β1, and subsequently may be regulated through the FAK signal transduction pathways. |
| ISSN: | 0366-6999 2542-5641 |