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pubmed-article:19576865pubmed:abstractTextThere is current evidence implicating the Wnt/beta-catenin/TCF pathway in breast cancer. We investigated the effect of para- and meta-positional isomers of nitric oxide-releasing aspirin (NO-ASA), and aspirin (ASA) on MCF-7 human breast cancer cell growth and beta-catenin/TCF signaling. The p- and m-NO-ASA isomers strongly inhibited cell growth and beta-catenin/TCF transcriptional activity compared to ASA; the IC50s for growth inhibition were 57+/-4, 193+/-10 and >5000microM, and for transcriptional inhibition they were 12+/-1.8, 75+/-6.5 and >5000microM for p-, m-NO-ASA and ASA, respectively. p-NO-ASA reduced the expression of Wnt/beta-catenin downstream target gene cyclin D1, and total cellular beta-catenin levels. COX-2 expression was induced by p-NO-ASA, protein kinase C inhibitors reversed this induction. p-NO-ASA blocked the cell cycle transition at S to G2/M phase. These studies suggest a targeted chemopreventive/chemotherapeutic potential for NO-ASA against breast cancer.lld:pubmed
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pubmed-article:19576865pubmed:articleTitleNitro-aspirin inhibits MCF-7 breast cancer cell growth: effects on COX-2 expression and Wnt/beta-catenin/TCF-4 signaling.lld:pubmed
pubmed-article:19576865pubmed:affiliationDepartment of Physiology and Pharmacology, City University of New York Medical School, 138th Street and Convent Avenue, New York, NY 10031, United States. nnath@nyit.edulld:pubmed
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