OBJECTIVETo evaluate the effect of concentrated growth factor extract (CGFe) on the proliferation and differentiation of MC3T3-E1 osteoblasts attached to sandblasted and acid etched titanium surfaces.

METHODSTrials were divided into experimental and control groups. The experimental group used a-MEM that contained CGFe (10% FBS), whereas the control group only used a-MEM (10% FBS). MTT assay was employed to detect the number of osteoblasts on the first, third, and fifth days. Alkaline phosphatase (ALP) activity and scanning electron microscope (SEM) were used to detect the osteoblast differentiations on the third and fifth days and to observe the osteoblast extensions on titanium surfaces for 12 h, respectively. Meanwhile, the levels of the osteogenetic biomarkers Runt-related transcription factor-2 (Runx2) and Osterix (Osx) on the third and seventh days were quantified via real-time polymerase chain reaction (PCR).

RESULTSMTT assay indicated that on the first, third, and fifth days, the absorbance in the experimental group significantly increased than that in the control group (P < 0.05). ALP activity: on the third and fifth days, the absorbance of the experimental group was significantly higher than that of the control group (P < 0.05). SEM: at 12 h, the extension of the experimental group cells was larger than that of the control group. Real-time PCR: given the standardization in the group, the gene expression level of the control group on the third day was 1, and the Runx2 and Osx gene expressions in the experimental group were larger than those of the con- trol group.

CONCLUSIONCGFe can efficiently stimulate the proliferation, differentiation and extension of MC3T3-E1 cells.