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• W2079701410 abstract "Overexpression of the MDR1 product, P-glycoprotein (Pgp), has been shown to be one of the mechanisms underlying the development of multidrug resistance (MDR). Recently, one mutant p53 has been shown to stimulate the MDR1 gene promoter in vitro, whereas wild-type p53 repressed this activity. We measured Pgp and p53 expression by immunoblotting in 34 colorectal tumours, and performed mutation analyses on the p53-positive tumours to confirm the presence of mutant p53 protein. Tumour DNA indices (DIs) were also measured using flow cytometry. Pgp was detected in 44% (15/34) of the tumours and in 100% (13/13) of the normal mucosas (P = 0.0005), with highest levels of expression seen in normal mucosa, suggesting that initial drug resistance in colorectal tumours is not caused by Pgp. Highly DNA aneuploid tumours demonstrated the lowest levels of Pgp expression relative to moderately aneuploid and diploid colorectal tumours. p53 protein was detected in 53% (18/34) of the tumours, and 12 of 14 p53-positive tumours had p53 gene mutations, p53-negative tumours had approximately twice the level of Pgp expression of p53-positive tumours. Pgp expression was not associated with either p53 expression (P = 0.73) or incidence of p53 gene mutation (P = 0.70), suggesting that mutant p53 does not induce Pgp overexpression in colorectal carcinomas." @default.
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• W2079701410 date "1995-08-01" @default.
• W2079701410 modified "2023-10-06" @default.
• W2079701410 title "P-glycoprotein is not expressed in a majority of colorectal carcinomas and is not regulated by mutant p53 in vivo" @default.
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• W2079701410 doi "https://doi.org/10.1038/bjc.1995.329" @default.
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