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Cancer cells that express P-glycoprotein, multidrug resistance-associated protein (MRP), or lung resistance protein (LRP) have demonstrated resistance to a wide variety of chemotherapeutic drugs. Recently, we reported that human colon carcinoma cells that express all three proteins exhibit reduced P-glycoprotein gene expression and a loss of multidrug resistance after exposure to tumor necrosis factor-alpha, a hormone-like protein produced by cells of the immune system. In this study, we examined the effects of tumor necrosis factor-alpha on MRP and LRP gene expression in the same colon carcinoma cells.

Tumor Necrosis factor- and Expression of the Multidrug Resistance-Associated Genes LRP and MRP