MMP-2和MMP-9在多发性肌炎/皮肌炎患者单一核细胞中的表达

目的　探讨基质金属蛋白酶MMP-2和MMP-9 与多发性肌炎/皮肌炎（PM/DM）的关系。方法　采用实时荧光定量PCR和Western印迹方法分别检测PM/DM患者外周血单一核细胞（PMBC）中MMP-2和MMP-9的mRNA和蛋白表达水平。结果　MMP-2、MMP-9在PM/DM患者外周血PMBC中的mRNA表达水平明显高于正常人对照组，其中MMP-2为正常人对照组的2.41倍、MMP-9则为1.66倍。Western印迹检测发现MMP-2、MMP-9在PM / DM 患者外周血PMBC中的蛋白表达水平也明显高于正常人对照组，与其mRNA表达结果一致。结论　基质金属蛋白酶MMP-2和MMP-9可能在PM/DM的发生中起作用。

Expression of matrix metalloproteinase-2 and-9 in the PBMC of patients with polymyositis and dermatomyositis

Objective To investigate the relation of the expressions of matrix metalloproteinase-2(MMP-2)and-9(MMP-9)with polymyositis/dermatomyositis(PM/DM).Methods Blood samples were obtained from 8 patients with PM,12 patients with DM and 10 normal human controls.Real-time quantitative RT-PCR and Western-blot were applied to examine the mRNA and protein expressions of MMP-2 and MMP-9 respectively in the peripheral blood mononuclear cells(PBMC)of these patients.Results The mRNA expression levels of MMP-2 and MMP-9 in the PBMC of patients with PM or DM were 2.41 and 1.66 folds as high as those of the normal controls,respectively;these difierences were significant between the two groups.Increased expressions of MMP-2 and MMP-9 were also noted in the patients with PM or DM.Conclusion MMP-2 and MMP-9 may play a part in the development of polymyositis and dermatomyositis.