MicroRNA-381 Represses ID1 and is Deregulated in Lung Adenocarcinoma

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MicroRNA-381 Represses ID1 and is Deregulated in Lung Adenocarcinoma Sacha I. Rothschild, MD, PhD, Mario P. Tschan, PhD, Rolf Jaggi, PhD, Martin F. Fey, MD, Mathias Gugger, MD, Oliver Gautschi, MD  Journal of Thoracic Oncology  Volume 7, Issue 7, Pages 1069-1077 (July 2012) DOI: 10.1097/JTO.0b013e31824fe976 Copyright © 2012 International Association for the Study of Lung Cancer Terms and Conditions

FIGURE 1 MiR-381 targets the ID1 3′UTR and is reciprocally associated with ID1 expression. A, Sequence alignment of miR-381 and its conserved target site in the ID1 3′UTR. B, Luciferase activity of the indicated construct cotransfected with miR-381 mimics. The columns represent the means of three independent experiments. C, ID1 and miR-381 expression was detected by qRT-PCR. MiR-381 expression was normalized to SNORA-73A, ID1 expression was normalized to 18S RNA. Correlation between miR-381 and ID1 mRNA expression levels in lung cancer cell lines. Spearman correlation coefficient R = −0.91. ID1, inhibitor of differentiation 1; 3′UTR, 3′ untranslated region; qRT-PCR, quantitative real-time polymerase chain reaction. Journal of Thoracic Oncology 2012 7, 1069-1077DOI: (10.1097/JTO.0b013e31824fe976) Copyright © 2012 International Association for the Study of Lung Cancer Terms and Conditions

FIGURE 2 MiR-381 expression correlates with ID1 repression. A, miR-381 expression was detected by qRT-PCR in three different lung cancer cell lines (A549, H460, and H1299). Cells were incubated for 24 hours with saracatinib or with DMSO. The results were normalized to SNORA-73A expression and are shown as n-fold changes relative to the expression levels in cells incubated with DMSO. All data are representative of three independent experiments. * indicate p < 0.05 compared to DMSO incubated control cells. B, p-Src and ID1 protein levels were analyzed by Western blotting. Indicated cell lines were incubated for 24 hours with two different concentrations of saracatinib or DMSO as a control. β-actin was used as a loading control. C, miR-381 expression in lung cancer cell lines treated with two concentrations of dasatinib. Analysis as in (2A). D, p-Src and ID1 protein in lung cancer cell lines treated with two concentrations of dasatinib. Analysis as in (2B). ID1, inhibitor of differentiation 1; DMSO, dimethyl sulfoxide; qRT-PCR, quantitative real-time polymerase chain reaction. Journal of Thoracic Oncology 2012 7, 1069-1077DOI: (10.1097/JTO.0b013e31824fe976) Copyright © 2012 International Association for the Study of Lung Cancer Terms and Conditions

FIGURE 3 MiR-381 is directly regulated by c-Src. A, Confirmation of c-Src knockdown in three different lung cancer cell lines transduced with lentiviral vectors expressing shRNA targeting c-Src (sh c-Src) or a scramble control shRNA (control). c-Src expression was measured by qRT-PCR and normalized to 18S RNA. All data are representative of three independent experiments. Differences in expression levels were analyzed by Mann-Whitney U test, *p < 0.05. B, miR-381 expression in c-Src knockdown and control lung cancer cell lines measured by qRT-PCR and normalized to SNORA-73A. All data are representative of three independent experiments. Statistical analysis as in (3A). qRT-PCR, Quantitative real-time polymerase chain reaction; shRNA, short hairpin RNA. Journal of Thoracic Oncology 2012 7, 1069-1077DOI: (10.1097/JTO.0b013e31824fe976) Copyright © 2012 International Association for the Study of Lung Cancer Terms and Conditions

FIGURE 4 Significant repression of miR-381 in human adenocarcinoma is correlated with patient outcome. A, Tumor tissue from lung adenocarcinoma and matched lung tissue from 18 patients was collected, formalin fixed, and paraffin embedded. Total RNA was extracted as described and miR-381 levels were measured by qRT-PCR. Values are the differences in Ct values between miR-381 and the levels of the housekeeping small RNA SNORA-73A. Because a large Ct value corresponds to a low expression level, we reversed this relation by multiplying by (−1) for better readability. (4B and 4C), Kaplan-Meier curves for event-free survival (B) and overall survival (C) in 18 patients with lung adenocarcinoma, according to tumor expression of miR-381 detected by qRT-PCR. Patients with miR-381 expression level more than the median expression of the whole cohort were classified as having high miR-381 level (gray line), all other patients were classified as having low miR-381 expression level (black line). Log-rank test was used for p values. qRT-PCR, quantitative real-time polymerase chain reaction. Journal of Thoracic Oncology 2012 7, 1069-1077DOI: (10.1097/JTO.0b013e31824fe976) Copyright © 2012 International Association for the Study of Lung Cancer Terms and Conditions

FIGURE 5 Ectopic expression of miR-381 downregulates ID1 levels and decreases migration/invasion. Cells were transduced with a lentiviral vector expressing precursor hsa-miR-381 or a scrambled vector (control). A, qRT-PCR for miR-381 to confirm the stable transduction of A549, H460, and H1299 cells with a lentiviral vector expressing precursor hsa-miR-381 or a scrambled control vector. All experiments were performed three times. *Mann-Whitney U test, p < 0.05. B, qRT-PCR for ID1 in A549, H460, and H1299 in control and miR-382 overexpressing cells. Results were normalized to 18S RNA and are shown as n-fold decrease relative to the level in the control cells. *Mann-Whitney U test, p < 0.05. C, Western blotting for total Src and ID1 in A549, H460, and H1299 cells. β-actin was used as loading control. D, Migration assay with A549 cells transduced with a scrambled vector (control), or a lentiviral vector containing hsa-miR-381 precursor (miR-381). Light microscopy images were performed immediately after scratching of the monolayer (0 hours), and 24 hours later. E, Invasion assay with A549 cells transduced with a control vector (control), or a lentiviral vector containing hsa-miR-381 precursor (miR-381). Cells were seeded onto matrigel chambers. After 24 hours, cells at the bottom of the insert were stained and counted. ID1, inhibitor of differentiation 1; qRT-PCR, quantitative real-time polymerase chain reaction. Journal of Thoracic Oncology 2012 7, 1069-1077DOI: (10.1097/JTO.0b013e31824fe976) Copyright © 2012 International Association for the Study of Lung Cancer Terms and Conditions