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The effect of synthetic inhibitors of matrix metalloproteinases (MMP) has been shown against a variety of tumors in preclinical models. Ro 28-2653, a novel synthetic MMP inhibitor, is able to reduce tumor growth in orthotopic prostatic cancer in rats (R3327 Dunning tumor). However, at present this inhibitory mechanism in tumor inhibition in vivo can only be partly explained by the inhibition of the...
The cytokine tumor necrosis factor (TNF)α induces caspase-dependent cell death in a subset of tumor cells. In this report, we show a novel suppressive effect of calpeptin, a calpain inhibitor, on TNFα-induced cell death and accumulation of p53 in L929 mouse fibrosarcoma. Exposure to 10 ng/ml TNFα induced cell death in >50% of L929 cells within 12 h and stimulated accumulation of p53 (8-fold). Preincubation...
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