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MCRS1 overexpression, which is specifically inhibited by miR-129*, promotes the epithelial-mesenchymal transition and metastasis in non-small cell lung cancer.

Liu MX, Zhou KC, Cao Y - Mol. Cancer (2014)

Bottom Line: The levels of MCRS1 expression were likewise correlated with tumor metastasis among NSCLC patients.We identified differentially expressed genes after MCRS1 silencing, which included cell junction molecules, such as ZO-1, Occludin, E-cadherin, and DSG2.However, these differentially expressed genes were not directly recognized by a transcriptional complex containing MCRS1.

View Article: PubMed Central - PubMed

Affiliation: Laboratory of Molecular and Experimental Pathology, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China. caoy@mail.kiz.ac.cn.

ABSTRACT

Background: Although tumor invasion and metastasis are both classical hallmarks of cancer malignancy and the major causes of poor clinical outcomes among cancer patients, the underlying master regulators of invasion and metastasis remain largely unknown. In this study, we observed that an overexpression of microspherule protein 1 (MCRS1) promotes the invasion and metastasis of non-small cell lung cancer (NSCLC) cells. Furthermore, we sought to systematically investigate the pathophysiological functions and related mechanisms of MCRS1.

Methods: Retrovirus-mediated RNA interference was employed to knockdown MCRS1 expression in NSCLC cell lines. Quantitative real-time polymerase chain reaction (qRT-PCR) and western blot respectively were used to measure levels of mRNA and protein. Further cell permeability assessment, invasion and proliferation assays were conducted to evaluate MCRS1 functions in vitro while nude mice experiments were performed to examine metastatic capability in vivo. Microarray analysis and microRNA (miRNA) sequencing were respectively carried out for mRNA and miRNA expression profiling, while chromatin immunoprecipitation (ChIP), luciferase reporter assay, and miRNA transfection were used to investigate the interaction between MCRS1 and miRNAs.

Results: MCRS1 knockdown induced morphological alterations, increased monolayer integrity, decreased cellular invasion and metastasis, and attenuated stemness and drug resistance among tested NSCLC cells. The levels of MCRS1 expression were likewise correlated with tumor metastasis among NSCLC patients. We identified differentially expressed genes after MCRS1 silencing, which included cell junction molecules, such as ZO-1, Occludin, E-cadherin, and DSG2. However, these differentially expressed genes were not directly recognized by a transcriptional complex containing MCRS1. Furthermore, we found that MCRS1 binds to the miR-155 promoter and regulates its expression, as well as MCRS1 promotes epithelial-mesenchymal transition (EMT), invasion, and metastasis through the up-regulation of miR-155. Systematic investigations ultimately showed that MCRS1 was directly and negatively regulated by the binding of miR-129* to its 3'-UTR, with miR-129* overexpression suppressing the growth and invasion of NSCLC cells.

Conclusions: MiR-129* down-regulation induced MCRS1 overexpression, which promotes EMT and invasion/metastasis of NSCLC cells through both the up-regulation of miR-155 and down-regulation of cell junction molecules. This miR-129*/MCRS1/miR-155 axis provides a new angle in understanding the basis for the invasion and metastasis of lung cancer.

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The drug resistance and generation of CD44+CSC-like cells in cultured NSCLC cells after MCRS1 silencing. (a) Assessment of the viability of EPLC-32 M1 and NCI-H292 cells after cisplatin treatment for 72 h. (b) Assessment of the viability of EPLC-32 M1 and NCI-H292 after cetuximab treatment for 72 h. (c) The expression of ABCB1 mRNA after MCRS1 depletion. (d) Flow cytometric analysis of CD44 expression in EPLC-32 M1 and NCI-H292 cells with or without MCRS1 knockdown. Luc: cells without MCRS1 silencing; Msh3: cells with stable MCRS1 silencing. *P <0.05 (one-way ANOVA and Student’s t-test).
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Fig2: The drug resistance and generation of CD44+CSC-like cells in cultured NSCLC cells after MCRS1 silencing. (a) Assessment of the viability of EPLC-32 M1 and NCI-H292 cells after cisplatin treatment for 72 h. (b) Assessment of the viability of EPLC-32 M1 and NCI-H292 after cetuximab treatment for 72 h. (c) The expression of ABCB1 mRNA after MCRS1 depletion. (d) Flow cytometric analysis of CD44 expression in EPLC-32 M1 and NCI-H292 cells with or without MCRS1 knockdown. Luc: cells without MCRS1 silencing; Msh3: cells with stable MCRS1 silencing. *P <0.05 (one-way ANOVA and Student’s t-test).

Mentions: As shown in Figure 2a and 2b, compared with MCRS1 depletion alone (no drug treatment) and the drug treatments alone (no MCRS1 depletion), MCRS1 silencing significantly inhibited the growth of EPLC-32 M1 and NCI-H292 after treatments with cisplatin (a common chemotherapy drug for NSCLC treatment) and cetuximab (a humanized anti-EGFR antibody used to treat advanced lung cancer). Furthermore, MCRS1 suppression significantly decreased mRNA expression of ABCB1 (multidrug resistance gene, Figure 2c) [16]. Collectively, these observations indicated that MCRS1 overexpression could trigger drug resistance.Figure 2


MCRS1 overexpression, which is specifically inhibited by miR-129*, promotes the epithelial-mesenchymal transition and metastasis in non-small cell lung cancer.

Liu MX, Zhou KC, Cao Y - Mol. Cancer (2014)

The drug resistance and generation of CD44+CSC-like cells in cultured NSCLC cells after MCRS1 silencing. (a) Assessment of the viability of EPLC-32 M1 and NCI-H292 cells after cisplatin treatment for 72 h. (b) Assessment of the viability of EPLC-32 M1 and NCI-H292 after cetuximab treatment for 72 h. (c) The expression of ABCB1 mRNA after MCRS1 depletion. (d) Flow cytometric analysis of CD44 expression in EPLC-32 M1 and NCI-H292 cells with or without MCRS1 knockdown. Luc: cells without MCRS1 silencing; Msh3: cells with stable MCRS1 silencing. *P <0.05 (one-way ANOVA and Student’s t-test).
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4233086&req=5

Fig2: The drug resistance and generation of CD44+CSC-like cells in cultured NSCLC cells after MCRS1 silencing. (a) Assessment of the viability of EPLC-32 M1 and NCI-H292 cells after cisplatin treatment for 72 h. (b) Assessment of the viability of EPLC-32 M1 and NCI-H292 after cetuximab treatment for 72 h. (c) The expression of ABCB1 mRNA after MCRS1 depletion. (d) Flow cytometric analysis of CD44 expression in EPLC-32 M1 and NCI-H292 cells with or without MCRS1 knockdown. Luc: cells without MCRS1 silencing; Msh3: cells with stable MCRS1 silencing. *P <0.05 (one-way ANOVA and Student’s t-test).
Mentions: As shown in Figure 2a and 2b, compared with MCRS1 depletion alone (no drug treatment) and the drug treatments alone (no MCRS1 depletion), MCRS1 silencing significantly inhibited the growth of EPLC-32 M1 and NCI-H292 after treatments with cisplatin (a common chemotherapy drug for NSCLC treatment) and cetuximab (a humanized anti-EGFR antibody used to treat advanced lung cancer). Furthermore, MCRS1 suppression significantly decreased mRNA expression of ABCB1 (multidrug resistance gene, Figure 2c) [16]. Collectively, these observations indicated that MCRS1 overexpression could trigger drug resistance.Figure 2

Bottom Line: The levels of MCRS1 expression were likewise correlated with tumor metastasis among NSCLC patients.We identified differentially expressed genes after MCRS1 silencing, which included cell junction molecules, such as ZO-1, Occludin, E-cadherin, and DSG2.However, these differentially expressed genes were not directly recognized by a transcriptional complex containing MCRS1.

View Article: PubMed Central - PubMed

Affiliation: Laboratory of Molecular and Experimental Pathology, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China. caoy@mail.kiz.ac.cn.

ABSTRACT

Background: Although tumor invasion and metastasis are both classical hallmarks of cancer malignancy and the major causes of poor clinical outcomes among cancer patients, the underlying master regulators of invasion and metastasis remain largely unknown. In this study, we observed that an overexpression of microspherule protein 1 (MCRS1) promotes the invasion and metastasis of non-small cell lung cancer (NSCLC) cells. Furthermore, we sought to systematically investigate the pathophysiological functions and related mechanisms of MCRS1.

Methods: Retrovirus-mediated RNA interference was employed to knockdown MCRS1 expression in NSCLC cell lines. Quantitative real-time polymerase chain reaction (qRT-PCR) and western blot respectively were used to measure levels of mRNA and protein. Further cell permeability assessment, invasion and proliferation assays were conducted to evaluate MCRS1 functions in vitro while nude mice experiments were performed to examine metastatic capability in vivo. Microarray analysis and microRNA (miRNA) sequencing were respectively carried out for mRNA and miRNA expression profiling, while chromatin immunoprecipitation (ChIP), luciferase reporter assay, and miRNA transfection were used to investigate the interaction between MCRS1 and miRNAs.

Results: MCRS1 knockdown induced morphological alterations, increased monolayer integrity, decreased cellular invasion and metastasis, and attenuated stemness and drug resistance among tested NSCLC cells. The levels of MCRS1 expression were likewise correlated with tumor metastasis among NSCLC patients. We identified differentially expressed genes after MCRS1 silencing, which included cell junction molecules, such as ZO-1, Occludin, E-cadherin, and DSG2. However, these differentially expressed genes were not directly recognized by a transcriptional complex containing MCRS1. Furthermore, we found that MCRS1 binds to the miR-155 promoter and regulates its expression, as well as MCRS1 promotes epithelial-mesenchymal transition (EMT), invasion, and metastasis through the up-regulation of miR-155. Systematic investigations ultimately showed that MCRS1 was directly and negatively regulated by the binding of miR-129* to its 3'-UTR, with miR-129* overexpression suppressing the growth and invasion of NSCLC cells.

Conclusions: MiR-129* down-regulation induced MCRS1 overexpression, which promotes EMT and invasion/metastasis of NSCLC cells through both the up-regulation of miR-155 and down-regulation of cell junction molecules. This miR-129*/MCRS1/miR-155 axis provides a new angle in understanding the basis for the invasion and metastasis of lung cancer.

Show MeSH
Related in: MedlinePlus