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Next generation sequencing analysis of transcriptomes in MDA-MB-231 and LM2-4175 cell lines

ABSTRACT: Next generation sequencing analysis of transcriptomes in MDA-MB-231 and LM2-4175 cell lines

PROVIDER: PRJNA511878 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR8370256_1.fastq.gz	Fastqsanger.gz
	SRR8370256_2.fastq.gz	Fastqsanger.gz
	SRR8370257_1.fastq.gz	Fastqsanger.gz
	SRR8370257_2.fastq.gz	Fastqsanger.gz
	SRR8370258_1.fastq.gz	Fastqsanger.gz

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Next generation sequencing analysis of transcriptomes in MDA-MB-231 and LM2-4175 cell lines

Project description:LM2-4175 cell line was originally selected from MDA-MB-231,but has more aggressive characteristics in invasion, migration and metastasis. In addition, LM2 cell line specifically metastasizes to lung. To understand the melecular mechanisms of lung metastasis in breast cancer,we analyzed the RNA-seq data of MDA-MB-231 and LM2-4175 cell lines.

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Project description:We performed whole-genome stability measurements for MDA-MB-231 and its highly metastatic derivative MDA-LM2. Our goal was to identify post-transcriptonal regulons that are deregulated en route to higher metastatic capacity. Cells were pulsed with 4-thiouridine for 2 hours and then RNA was extracted at 0, 2, 4, and 7 hr time-points in quadruplicate from each cell line. 4sU labeling followed by RNA-seq was then used to measure the abundance of transcripts in each population. A decay rate was estimated based on the rate at which transcript abundance was reduced at these time-points.

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Project description:Purpose: Tumor metastasis is the main cause of death from breast cancer patients and cell migration plays a critical role in metastasis. Recent studies have shown long non-coding RNAs (lncRNAs) play an essential role in the initiation and progression of cancer. In the present study, the role of a LncRNA, Rho GTPase Activating Protein 5- Antisense 1 (ARHGAP5-AS1) in breast cancer was investigated. Methods: RNA sequencing was performed to find out dysregulated LncRNAs in MDA-MB-231-LM2 cells. Transwell migration assays and F-actin staining were utilized to estimate cell migration ability. RNA pulldown assays and RNA immunoprecipitation were used to prove the interaction between ARHGAP5-AS1 and SMAD7. Western blot and immunofluorescence imaging were used to examine the protein levels. Dual luciferase reporter assays were performed to evaluate the activation of TGF-β signaling. Results: Compared to MDA-MB-231 cells, the expression of LncRNA ARHGAP5-AS1 (NR_027263) was significantly suppressed in its highly metastatic subtype MDA-MB-231-LM2 cells. Functional study showed ARHGAP5-AS1 could inhibit cell migration via suppression of stress fibers in breast cancer cell lines. Afterwards, SMAD7 was further identified to interact with ARHGAP5-AS1 by its PY motif and thus its ubiquitination and degradation was blocked due to reduced interaction with E3 ligase SMURF1 and SMURF2. Moreover, ARHGAP5-AS1 could inhibit TGF-β signaling pathway due to its inhibitory role on SMAD7. Conclusion: Overall, these findings demonstrate that ARHGAP5-AS1 inhibits breast cancer cell migration and could serve as a novel biomarker for breast cancer metastasis and a potent target for the treatment in the future.

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Hypoxia response by human breast cancer cell MDA-MB-231 sublines

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