LPS did not directly affect the expression of MMP 9 in FLS, but it was found to indirectly cause the increase of MMP 9 expression in FLS by stimulating U937 cell. Dexamethasone was found to inhibit this increase of MMP 9 expression.

• LPS对FLS中MMP 9表达无直接影响 ,LPS刺激的U93 7细胞上清液使FLS中MMP 9表达增加 ,而地塞米松能抑制MMP 9的变化