It is known that osteoclast is the main ce ll causing osseous erosion, while matrix metalloproteinase-9 highly expressed in osteoclast, plays an important role in extracellular matrix degradation.

目前，已经知道破骨细胞是导致关节侵蚀的主要细胞，而基质金属蛋白酶9 (MMP - 9)在破骨细胞中高表达，在细胞外间质的降解中发挥重要作用。

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Well, it's true that it's not stuck to plastic but it is stuck to other materials The other materials that it's stuck to include other cells that surround it and this complex matrix which surrounds all of the cells in our body called extracellular matrix and I'll get to that in just a few moments.

体内的细胞不会贴在塑料片上,但是它们会和别的材料黏联在一起,这些材料包括,细胞和周围细胞间的黏联,细胞同细胞外基质的黏联,我们身体中包围在细胞周围的物质,称为细胞外基质,后面我会详细讲到

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