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- W2040099100 abstract "Cystatin M is a potent endogenous inhibitor of lysosomal cysteine proteases. In breast carcinoma, cystatin M expression is frequently downregulated. It has been shown that cystatin M expression suppressed growth and migration of breast cancer cells. We examined the methylation status of the CpG island promoter of cystatin M in four breast cancer cell lines (MDAMB231, ZR75-1, MCF7 and T47D), in 40 primary breast carcinoma and in corresponding normal tissue probes by combined bisulphite restriction analysis. To investigate the effects of cystatin M expression on the growth of breast carcinoma, cystatin M was transfected in T47D. The cystatin M promoter was highly methylated in all four-breast cancer cell lines. Primary breast tumours were significantly more frequently methylated compared to normal tissue samples (60 vs 25%; P=0.006 Fisher's exact test). Treatment of breast cancer cells with 5-aza-2'-deoxycytidine (5-Aza-CdR), reactivated the transcription of cystatin M. Transfection of breast carcinoma cells with cystatin M caused a 30% decrease in colony formation compared to control transfection (P=0.002). Our results show that cystatin M is frequently epigenetically inactivated during breast carcinogenesis and cystatin M expression suppresses the growth of breast carcinoma. These data suggest that cystatin M may encode a novel epigenetically inactivated candidate tumour suppressor gene." @default.
- W2040099100 created "2016-06-24" @default.
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- W2040099100 date "2006-11-13" @default.
- W2040099100 modified "2023-10-14" @default.
- W2040099100 title "Frequent epigenetic inactivation of cystatin M in breast carcinoma" @default.
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- W2040099100 doi "https://doi.org/10.1038/sj.onc.1210107" @default.
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