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. 1992 Mar 15;89(6):2504–2508. doi: 10.1073/pnas.89.6.2504

Down-regulation of a member of the S100 gene family in mammary carcinoma cells and reexpression by azadeoxycytidine treatment.

S W Lee 1, C Tomasetto 1, K Swisshelm 1, K Keyomarsi 1, R Sager 1
PMCID: PMC48687  PMID: 1372446

Abstract

A cDNA clone, designated CaN19 (originally called clone 19), isolated by subtractive hybridization, contains sequences that are preferentially expressed in normal mammary epithelial cells but not in breast tumor cells. Comparison of its deduced amino acid sequence with sequences in the GenBank data base revealed similarity with the S100 protein family, a group of small Ca(2+)-binding modulator proteins involved in cell cycle progression and cell differentiation. CaN19 expression is down-regulated in normal cells by A23187, a calcium ionophore, suggesting that its regulation is calcium-dependent. We have assigned CaN19 to human chromosome 1q21-q24, a region containing four other S100-related genes. In contrast to CaN19 mRNA expression, most members of the S100 protein family are activated or overexpressed in tumor cells. Synchronization experiments by growth-factor deprivation demonstrated a biphasic induction of CaN19 expression in normal cells, approximately 2-fold in early G1 phase and another 2- to 3-fold at the G1/S boundary. Exposure of mammary tumor cells to 5-aza-2'-deoxycytidine, an inhibitor of DNA methylation, reactivated the expression of CaN19 mRNA.

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