Expression of matrix metalloproteinase 2 and matrix metalloproteinase 9 induced by wear particles / 中国矫形外科杂志

ABSTRACT

[Objective] To compare the expression of matrix metalloproteinase 2(MMP-2)and matrix metalloproteinase 9(MMP-9)induced by alumina and ultra-high-molecular-weight polyethylene(UHMWPE)wear particles,and investigate the role of MMP-2 and MMP-9 in the mechanism of the periprosthetic osteolysis induced by wear debris during aseptic loosening.[Methods]Seventy-two Kunmin mice were divided into 3 groups(24 per group)in a murine air pouch model of inflammation.The air pouches were injected with 3ml of suspension containing 1?108 /ml alumina particles in group A,while UHMWPE particles in group B,and control pouches received 3ml of sterile PBS.All animals were sacrificed at 3、7、14 days after injection.Histological changes and cell counting were assessed by light microscope.RT-PCR and immunohistochemistry method were applied to detect the gene and protein expression of MMP-2 and MMP-9 in the pouches.[Results]Increased cell infiltration and MMP-2,MMP-9 mRNA and immunoreactivity expression were detected in group A and B,and compared to control group,cell number and gene and protein expression of MMP-2 and MMP-9 in group A and B was significantly higher(P