[Comparison of the Biological Functions between Human Bone Marrow Derived CD106 ⁺Mesenchymal Stem Cells and CD106 ^-...

Objective To analyze the differences in biological functions between bone marrow(BM)-derived CD106 ⁺mesenchymal stem cells(MSCs)and the CD106 ^- subgroup. Methods The MSCs from normal BM were isolated and expanded.The subgroups of CD106 ⁺ and CD106 ^-MSCs were sorted.The cell proliferation and adhesion functions,chemotactic activities,adipogenic and osteogenic potentials,senescence,and senescence protein 21(p21)were detected.The capacity of translocation into nucleus of nuclear factor-kappa B(NF-κB)when stimulated by tumor necrosis factor(TNF-α)was measured. Results The proliferative ability was higher in CD106 ⁺MSCs than that in CD106 ^-MSCs.In 48 hours,the value of optical density(OD)was significantly higher in CD106 ⁺MSCs than that in CD106 ^- subgroup(1.004±0.028 vs. 0.659±0.023,t=3.946,P=0.0225).In 72 hours,this phenomenon was even more pronounced(2.574±0.089 vs. 1.590±0.074,t=11.240,P=0.0000).The adhesive capacity of CD106 ⁺MSCs was significantly stronger than that of CD106 ^- subgroup(0.648±0.018 vs. 0.418±0.023,t=7.869,P=0.0002).Besides,the metastasis ability of CD106 ⁺MSCs were significantly stronger than that of CD106 ^- subgroup(114.500±4.481 vs.71.000±4.435,t=6.900,P=0.0005).The CD106 ⁺MSCs had signifcnatly lower proportions of senescent cells.The expression of aging protein p21 in CD106 ⁺MSCs was significantly lower than that in CD106 ^-MSCs [(17.560±1.421)% vs.(45.800±2.569)%,t=9.618,P=0.0000].Furthermore,there were no visible pigmenting cells after β-galactosidase staining in CD106 ⁺MSCs subgroup.However,in CD106 ^-MSCs,some colored green cells were detected.The rate of NF-κB translocation into nucleus after stimulated by TNF-α was significantly higher in CD106 ⁺MSCs than CD106 ^- MSCs [(37.780±3.268)% vs.(7.30±1.25)%,t=8.713,P=0.0001]. Conclusion Bone marrow-derived CD106 ⁺MSCs possess more powerful biological functions than CD106 ^-MSCs.