Inhibition of motility and invasion of B16 melanoma by the overexpression of cystatin C

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Abstract
Although increased expression of cysteine proteinases has been shown to be correlated with increased metastasis for a wide variety of tumours, the contribution of cysteine proteinases to the metastatic spread of tumour cells is not well understood. In order to examine this question we have overexpressed a specific cysteine pro-teinase inhibitor, cystatin C, by stable transfection of B16F10 melanoma. Increased expression of cystatin C inhibited motility and in vitro invasiveness of B16 melanoma by 50% in both stimulated (autocrine motility factor, laminin) and unstimulated cells. These results suggest that cysteine proteinases are involved in B16 melanoma motility and invasion.

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