Abstract
Overproduction of matrix metalloproteinases (MMPs) and alterations in adhesive and migratory behavior are common characteristics of metastatic cancer cells. Ovarian cancer is a highly invasive type of malignancy. The effect of the antineoplastic drug paclitaxel on human ovarian cancer cell (Ovcar-3) invasion was studied using an in vitro invasion assay with reconstituted basement membrane. The effect of treatment with paclitaxel was also determined separately on certain invasion-associated events, such as the secretion of 72 kDa type IV collagenase (gelatinase A/MMP-2), the expression of the tissue inhibitor of metalloproteinase-2 (TIMP-2), cell attachment and migration. Ovcar-3 cell attachment, migration and in vitro invasion were significantly decreased after paclitaxel treatment (P = 0.02, P < 0.01 and P = 0.001, respectively) whereas no alteration in the secretion of latent MMP-2 was noted. However, the intracellular localization of the immunoreactive protein for MMP-2 was altered in response to paclitaxel treatment. Interestingly, paclitaxel increased the appearance of TIMP-2 protein in culture medium (P = 0.002) but did not change the expression of mRNA for TIMP-2 in Ovcar-3 cells. These data show that paclitaxel is an ef...Continue Reading
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