Increased expression and activation of matrix metalloproteinase-2 (MMP-2) in O-1N: hamster oral squamous cell...

Oral squamous cell carcinoma (OSCC) is one of the most common head and neck cancers with poor clinical outcome. MMP-2 was implied to contribute to the invasiveness and metastatization of various malignancies because of the degradation of type IV collagen. In this experiment, ELISA, Western blot and Q-RT-PCR was performed to investigate the expression and activation of MMP-2 in serum and tumor from hamster oral cancer model with high lymph node metastasis based on the various stages of OSCC development. Active MMP-2 in the serum was found elevated during oral cancer progression. In the metastatic stage, total MMP-2 level was 46% higher than it in the expansive stage, while active MMP-2 level increased 6-fold than it in the expansive stage. MMP-2 serum activation ratio was significantly enhanced in the metastatic stage than before tumor transplantation and that in the expansive stage. MMP-2 protein and MMP-2 mRNA was found to be increased during oral cancer development in hamster models. The increase of MMP-2 expression and activation starts prior to the metastasis occurrence, indicating the important role of MMP-2 in the early phase of oral cancer progression. Active MMP-2 level in serum may be a useful indicator for monitoring oral cancer progression.