Intravenous miR-144 inhibits tumor growth in diethylnitrosamine-induced hepatocellular carcinoma in mice

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Abstract

Previous in vitro studies have demonstrated that miR-144 inhibits hepatocellular carcinoma cell proliferation, invasion, and migration. We have shown that miR-144, injected intravenously, is taken up by the liver and induces endogenous hepatic synthesis of miR-144. We hypothesized that administered miR-144 has tumor-suppressive effects on liver tumor development in vivo. The effects of miR-144 on tumorigenesis and tumor growth were tested in a diethylnitrosamine-induced hepatocellular carcinoma mouse model. MiR-144 injection had no effect on body weight but significantly reduced diethylnitrosamine-induced liver enlargement compared with scrambled microRNA. MiR-144 had no effect on diethylnitrosamine-induced liver tumor number but reduced the tumor size above 50%, as evaluated by magnetic resonance imaging (scrambled microRNA 23.07 ± 5.67 vs miR-144 10.38 ± 2.62, p < 0.05) and histological analysis (scrambled microRNA 30.75 ± 5.41 vs miR-144 15.20 ± 3.41, p < 0.05). The levels of miR-144 was suppressed in tumor tissue compared with non-tumor tissue in all treatment groups (diethylnitrosamine–phosphate-buffered saline non-tumor 1.05 ± 0.09 vs tumor 0.54 ± 0.08, p < 0.01; diethylnitrosamine–scrambled microRNA non-tumor 1.23 ± 0.33 vs tumor 0.44 ± 0.10, p < 0.05; diethylnitrosamine-miR-144 non-tumor 54.72 ± 11.80 vs tumor 11.66 ± 2.75, p < 0.01), but injection of miR-144 greatly increased miR-144 levels both in tumor and non-tumor tissues. Mechanistic studies showed that miR-144 targets epidermal growth factor receptor and inhibits the downstream Src/AKT signaling pathway which has previously been implicated in hepatocellular carcinoma tumorigenesis. Exogenously delivered miR-144 may be a therapeutic strategy to suppress tumor growth in hepatocellular carcinoma.

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CITATION STYLE

APA

He, Q., Wang, F., Honda, T., Lindquist, D. M., Dillman, J. R., Timchenko, N. A., & Redington, A. N. (2017). Intravenous miR-144 inhibits tumor growth in diethylnitrosamine-induced hepatocellular carcinoma in mice. Tumor Biology, 39(10), 1–8. https://doi.org/10.1177/1010428317737729

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