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• W2335346095 abstract "Proceedings: AACR 102nd Annual Meeting 2011‐‐ Apr 2‐6, 2011; Orlando, FLThe North American region has the highest rates of renal cancers in the entire world. MicroRNAs are small noncoding RNAs that play important roles in numerous cellular processes including development, proliferation, and apoptosis. miR-23b is part of a cluster of miRNAs which includes among others miR-24-1, miR-27b and miR-30a. Recent studies have demonstrated that miR-23b plays different roles in different organs of the body. This led us to speculate its role in urological cancers in general and renal cancer in particular. In the current study we observe the role of miR-23b in renal cancer. The expression of miR-23b was checked in 30 pairs of renal cancer and normal tissues. The samples included three different types of renal cancer tissues, clear cell, papillary and tubular. 55% of clear cell carcinoma and all tubular samples showed high expression of miR-23b as compared to the normal. Interestingly, papillary carcinoma showed a contrasting result in which miR-23b levels were found to be down regulated in almost 90% of the samples. The expression in renal cancer cell lines, A498, ACHN, Caki-1 and Caki-2 was found to be significantly higher as compared to the normal cell line HK-2. The chemo preventive agent Genistein (25µM for 96 hours) was able to reduce the expression of miR-23b in A498 cells by more than 50%. Inhibition of miR-23b expression by the anti-miR-23b antagonist in A498 cells resulted in a significant increase in apoptosis, as detected through flow cytometry analysis. In contrast over expression of mir-23b in A498 cells resulted in a decrease in apoptosis. No significant effect on cell cycle was observed in either over expressing or inhibiting miR-23b in A498 cells. Cell viability assays also did not show any major effect due to the inhibition of expression of miR-23b. Moreover, the expression of miR-23b was correlated with 5 year survival rate of patients. For patients with low levels of miR-23b, 85% of patients survived after 5 years of operation, whereas in case of high expression of miR-23b only 50% survived. Our data suggests that miR-23b acts as an oncogenic mi-RNA in renal cancer.Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 102nd Annual Meeting of the American Association for Cancer Research; 2011 Apr 2-6; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2011;71(8 Suppl):Abstract nr 128. doi:10.1158/1538-7445.AM2011-128" @default.
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• W2335346095 date "2011-04-15" @default.
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• W2335346095 title "Abstract 128: MicroRNA-23b acts as an oncogenic microRNA in renal cancer" @default.
• W2335346095 doi "https://doi.org/10.1158/1538-7445.am2011-128" @default.
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