PMID: 9651124Jul 3, 1998Paper

Effects of curcumin on P-glycoprotein in primary cultures of rat hepatocytes

Life Sciences
N RomitiE Chieli

Abstract

Curcumin is a natural phenolic compound found in the rhizomes of Curcuma longa and endowed with beneficial biological activities including antioxidant, anticarcinogenic and hepatoprotective effects. In this study curcumin was tested for its potential ability to interact in vitro with hepatic P-glycoprotein (Pgp), in a model system represented by primary cultures of rat hepatocytes, in which spontaneous overexpression of multidrug resistance (mdr) genes occurs. In both freshly-plated hepatocytes, containing low levels of Pgp, and 72 hour-cultured hepatocytes, containing high levels of Pgp, the Rhodamine-123 (R-123) efflux, which represents a specific functional test for Pgp-mediated transport, was inhibited by curcumin in a dose-dependent manner. Western blot analysis showed that 25microM curcumin, when included in the culture medium throughout the experimental observation (72 hours), was able to significantly lower the increase of mAb C219-immunoreactive protein spontaneously occurring in the cells during culture. Curcumin, at doses ranging from 50 to 150microM was cytotoxic for freshly-plated hepatocytes, as shown by the strong decrease in the cell ability to exclude trypan blue 24 hours later, but it was significantly less cy...Continue Reading

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