Type I collagen degradation by invasive oral squamous cell carcinoma.

Expression of extracellular matrix-degrading proteases is required for tumor cell invasion. In the present study we examined the production of type I collagen-degrading matrix metalloproteinases (MMPs) in the invasive oral squamous cell carcinoma-derived cell line HSC-3. In the absence of serum or exogenous growth factors, HSC-3 cells displayed no collagen degradation activity. Addition of serum slightly increased collagen proteolysis. However, addition of epidermal growth factor (EGF) resulted in nearly complete degradation of the collagen matrix. Zymography showed that MMP-2 and -9 are secreted by HSC-3 cells. EGF stimulated secretion of an additional gelatinase with a molecular weight similar to that of MMP-1. Immunoblotting of conditioned medium confirmed that EGF and, to a lesser degree type I collagen, increased production of MMP-1. Finally, in situ hybridization revealed intense expression of MMP-1 in oral squamous cell carcinoma specimens. Together, these results indicate that MMP-1 is expressed, induced by EGF, and required for type I collagen degradation in oral squamous cell carcinoma.

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