Among these MMPs, the type IV collagenases ( MMP-2 and MMP-9) are particularly important in tissue infiltration by PMNs during inflammation because of the abundance of type IV collagen in the vascular basement membrane.

• 在MMPs家族中，W型胶原蛋白酶(MMP一和MMP习)在炎症过程的PMNS组织浸润中尤其重要，因为W型胶原蛋白在血管基底膜中是十分丰富的。