Transcriptional regulation of NOX genes express ion in human breast adenocarcinoma MCF-7 cells is modulated by adaptor protein Ruk/CIN 85.

NADPH oxidases are key components of redox-dependent signaling networks involved in the control of cancer cell proliferation, survival and invasion. The data have been accumulated that demonstrate specific expression patterns and levels of NADPH oxidase homologues (NOXs) and accessory genes in human cancer cell lines and primary tumors as well as modulation of these parameters by extracellular cues. Our previous studies revealed that production by human colorectal adenocarcinoma HT-29 cells is positively correlated with adaptor protein Ruk/CIN85 expression while increased levels of Ruk/CIN85 in weakly invasive human breast adenocarcinoma MC F-7 cells contribute to their malignant phenotype through the constitutive activation of Src/Akt pathway. In this study, to investigate whether overexpression of Ruk/CIN85 in MC F-7 cells can influence transcriptional regulation of NOXs genes, the subclones of MCF-7 cells with different levels of Ruk/CIN85 were screened for NOX1, NOX2, NOX3, NOX4, NOX5, DUOX1 and DUOX2 as well as for regulatory subunit p22Phox mRNA contents by quantitative RT-PCR (qPCR). Systemic multidirectional changes in mRNA levels for NOX1, NOX2, NOX5, DUOX2 and p22Phox were revealed in Ruk/CIN85 overexpressing cells in comparison to control WT cells. Knocking down of Ruk/CIN85 using technology of RNA-interference resulted in the reversion of these changes. Further studies are necessary to elucidate, by which molecular mechanisms Ruk/CIN85 could affect transcriptional regulation of NOXs genes.

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