Long noncoding RNA Linc00673 which enhances cancer cells progression by sponging miR-515-5p to elevate expression of MARK4 in human breast cancer
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE133331 | GEO | 2019/10/29
REPOSITORIES: GEO
Similar Datasets
Project description:Long noncoding RNA Linc00673 which enhances cancer cells progression by sponging miR-515-5p to elevate expression of MARK4 in human breast cancer
| PRJNA551136 | ENA
Project description:Long non-coding RNAs (lncRNAs) are involved in the pathology of various tumors. However, the role of lncRNA in breast cancer remains unclear. We performed microarrays to identify the differentially expressed mRNAs and lncRNAs in breast tissues with or without miR-34a knockout. In vitro and in vivo assays were preformed to explore the biological effects of the differentially expressed mRNA and lncRNA in breast cancer cells. We found that Adam12 and lnc015192 were significantly upregulated in miR-34a knockout breast tissues. Knockdown of Adam12 and lnc015192 inhibited breast cancer cells migration, invasion and epithelial-mesenchymal transition (EMT) in vitro and in vivo. Further study indicated that lnc015192 acted as a competing endogenous RNA (ceRNA) for miR-34a to regulate Adam12 expression. Taken together, our findings demonstrate how Adam12 and lnc015192 induce breast cancer metastasis and offer novel therapeutic targets for breast cancer.
2018-08-01 | GSE111587 | GEO
Project description:The let-7 microRNA families are tumor suppressors often deregulated in cancer, yet the underlying mechanisms of let-7 disruption remain poorly understood. Neuroblastoma is defined in part by poor prognosis associated with genetic amplification of MYCN, itself a let-7 target. The let-7 biogenesis inhibitor LIN28B has been implicated as a critical regulator of MYCN ; however, here we show that LIN28B is dispensable for both MYCN protein expression and growth of MYCN amplified neuroblastoma cell lines despite robust de-repression of let-7 . We further report that amplified MYCN mRNA is a potent let-7 sponge that through exceptionally high expression defines a sub-set of self-sponging amplified competing endogenous RNA (aceRNA) and reconciles the dispensability of LIN28B . In addition, we observe frequent genomic loss of let-7 that inversely associates with MYCN- amplification, providing an explanation for common, yet unresolved amplification-independent patterns of chromosome loss. We thus propose a model whereby let-7 disruption by genetic loss, LIN28B expression, or aceRNA sponging is a unifying mechanism of neuroblastoma pathogenesis. Indeed, our data show that the majority of neuroblastomas have at least one let-7 disruption event and that genetic loss in non-MYCN amplified tumors marks decreased survival, further underscoring its importance. The inverse relationship between allelic loss and sponging of let-7 from highly expressed or amplified oncogenes may have broad implications for oncogenesis. BE(2)C:MYCN-ORF cells transfected with siRNA and miRNA mimics
2016-07-06 | E-GEOD-81497 | biostudies-arrayexpress
Project description:The let-7 microRNA families are tumor suppressors often deregulated in cancer, yet the underlying mechanisms of let-7 disruption remain poorly understood. Neuroblastoma is defined in part by poor prognosis associated with genetic amplification of MYCN, itself a let-7 target. The let-7 biogenesis inhibitor LIN28B has been implicated as a critical regulator of MYCN ; however, here we show that LIN28B is dispensable for both MYCN protein expression and growth of MYCN amplified neuroblastoma cell lines despite robust de-repression of let-7 . We further report that amplified MYCN mRNA is a potent let-7 sponge that through exceptionally high expression defines a sub-set of self-sponging amplified competing endogenous RNA (aceRNA) and reconciles the dispensability of LIN28B . In addition, we observe frequent genomic loss of let-7 that inversely associates with MYCN- amplification, providing an explanation for common, yet unresolved amplification-independent patterns of chromosome loss. We thus propose a model whereby let-7 disruption by genetic loss, LIN28B expression, or aceRNA sponging is a unifying mechanism of neuroblastoma pathogenesis. Indeed, our data show that the majority of neuroblastomas have at least one let-7 disruption event and that genetic loss in non-MYCN amplified tumors marks decreased survival, further underscoring its importance. The inverse relationship between allelic loss and sponging of let-7 from highly expressed or amplified oncogenes may have broad implications for oncogenesis. Two cell lines, sampled in triplicate.
2016-07-06 | E-GEOD-81499 | biostudies-arrayexpress
Project description:The let-7 microRNA families are tumor suppressors often deregulated in cancer, yet the underlying mechanisms of let-7 disruption remain poorly understood. Neuroblastoma is defined in part by poor prognosis associated with genetic amplification of MYCN, itself a let-7 target. The let-7 biogenesis inhibitor LIN28B has been implicated as a critical regulator of MYCN ; however, here we show that LIN28B is dispensable for both MYCN protein expression and growth of MYCN amplified neuroblastoma cell lines despite robust de-repression of let-7 . We further report that amplified MYCN mRNA is a potent let-7 sponge that through exceptionally high expression defines a sub-set of self-sponging amplified competing endogenous RNA (aceRNA) and reconciles the dispensability of LIN28B . In addition, we observe frequent genomic loss of let-7 that inversely associates with MYCN- amplification, providing an explanation for common, yet unresolved amplification-independent patterns of chromosome loss. We thus propose a model whereby let-7 disruption by genetic loss, LIN28B expression, or aceRNA sponging is a unifying mechanism of neuroblastoma pathogenesis. Indeed, our data show that the majority of neuroblastomas have at least one let-7 disruption event and that genetic loss in non-MYCN amplified tumors marks decreased survival, further underscoring its importance. The inverse relationship between allelic loss and sponging of let-7 from highly expressed or amplified oncogenes may have broad implications for oncogenesis. Three cell lines, sampled in triplicate.
2016-07-06 | E-GEOD-81498 | biostudies-arrayexpress
Project description:Estrogen and estrogen receptor (ER) signaling play critical roles in the development of ER-positive breast cancer, and endocrine therapy is the frontline treatment for ER-positive breast cancer patients. However, the primary and acquired resistance to endocrine therapy including tamoxifen and fulvestrant remains as the major challenge in the clinic. Here, we identified an estrogen-induced lncRNA, LINC02568, through transcriptomic analysis, which is highly expressed in ER-positive breast cancer. LINC02568 is functional important in ER-positive breast cancer cell growth in vitro and tumorigenesis in vivo as well as endocrine therapy resistance. Mechanically, we demonstrated that LINC02568 regulates, in trans, estrogen/ERα-induced gene transcriptional activation by sponging miR-1233-5p to stabilize ESR1 mRNA in the cytoplasm. Meanwhile, LINC02568 contributes to tumor-specific pH homeostasis in breast cancer cells by regulating CA12 in cis in the nucleus. The dual functions of LINC02568 together contribute to breast cancer cell growth and tumorigenesis as well as endocrine therapy resistance. Antisense oligonucleotides (ASO) targeting LINC02568 significantly inhibits ER-positive breast cancer cell growth in vitro and tumorigenesis in vivo as well as resensitize tamoxifen-resistant cells to tamoxifen. Furthermore, combination treatment with ASO targeting LINC02568 and tamoxifen exhibits synergistic effect on tumor growth. Taken together, our findings revealed dual mechanisms of LINC02568 in regulating ERα signaling and pH homeostasis in ER-positive breast cancer, and indicated that targeting LINC02568 might represent a potential therapeutic avenue in clinic.
2023-09-13 | GSE217190 | GEO
Project description:The lncRNA biomarkers in melanoma remain to be further explored. The lncRNAs with different expression levels in melanoma tissue were identified by microarray analysis. To investigate the biological functions of target lncRNA, several in-vivo and in-vitro studies were performed. Potential mechanisms of competitive endogenous RNAs (ceRNAs) were predicted by using bioinformatics analysis and explored by western blot assay, fluorescence in situ hybridization assay, real-time quantitative PCR (RT-qPCR) array, RNA pull-down analysis, AGO2-RIP assay, and dual-luciferase reporter assay. The results demonstrated decreased LINC00459 in melanoma cell lines and tissues. According to the in-vitro and in-vivo experiments, up-regulated LINC00459 had inhibitory effect on cell proliferation and invasion. Bioinformatics analyses suggested that miR-218 could be a direct target of LINC00459. In addition, miR-218 was proved to be able to directly target the dickkopf-related protein 3 (DKK3) gene. In conclusion, our analysis suggested that the LINC00459 could sponge miR-218 and increase the expression of DKK3 gene, thus inhibiting the invasion and proliferation of melanoma cells, which indicated that the LINC00459 could be an effective biomarker for melanoma and its potential as the therapeutic target.
| S-EPMC6914790 | biostudies-literature
Project description:Long noncoding RNAs (lncRNAs) affect docetaxel chemosensitivity. However, the biological role and regulatory mechanisms of lncRNAs in docetaxel-resistant prostate cancer remain unclear. Differences in lncRNAs were evaluated by lncRNA sequencing and evaluated using quantitative real-time polymerase chain reaction, and TrkB expression was measured through Western blot analysis. Proliferation was measured using the MTS, while apoptosis and cell cycle were measured using flow cytometry. Additionally, migration and invasion were measured using transwell assays. Forty-eight female BALB/c nude mice were used for subcutaneous tumorigenicity and lung metastasis assays. We found that LINC01963 was overexpressed in the PC3-DR cells. LINC01963 silencing enhanced the chemosensitivity of PC3-DR to docetaxel and inhibited tumorigenicity and lung metastasis, while LINC01963 overexpression enhanced the chemoresistance of PC3 cells to docetaxel. It was found that LINC01963 sponges miR-216b-5p. The miR-216b-5p inhibitor reversed the suppressive effect of sh-LINC01963 on PC3-DR cell proliferation, migration, and invasion. Furthermore, miR-216b-5p can bind to the 3’-UTR of NTRK2 and inhibit TrkB protein levels. TrkB enhances docetaxel resistance in prostate cancer and reverses the effects of LINC01963 silencing and miR-216b-5p overexpression. In conclusion, silencing LINC01963 enhanced the chemosensitivity of PC3-DR to docetaxel by sponging miR-216b-5p to inhibit TrkB protein levels.
2021-12-13 | GSE190648 | GEO
Project description:Circular (circ) RNAs have been widely reported to be involved in gastric cancer (GC) pathogenesis and coiled coil domain containing 6 (CCDC6) is recognized as fused partner of multiple oncogenes; however, the underlying mechanisms of how circRNAs regulate CCDC6 expression in the progression and prognosis of GC remain unclear. Here, we discovered a novel circRNA derived from the DNA2 gene locus (circDNA2) through joint analysis of circRNA microarrays. By performing qRT-PCR and FISH assays with a human tissue microarray, circDNA2 was identified to be highly expressed in GC tissues and associated with lymphatic invasion of GC patients. Knockdown of circDNA2 suppressed the proliferation of GC cells by reducing CCDC6 expression in vitro. Mechanically, circDNA2 acted as a sponge for microRNA (miR)-149-5p, which was validated to target CCDC6 by dual luciferase reporter assays and rescue experiments. Both miR-149-5p low expression and CCDC6 high expression were related to unfavorable prognosis of GC patients. Moreover, GC patients with low miR-149-5p expression had shorter overall survival and higher risk of chemotherapy resistance compared with these with high miR-149-5p expression. In summary, our findings reveal that circDNA2 contributes to the growth and lymphatic metastasis of GC through upregulating CCDC6 expression via sponging miR-149-5p. The circDNA2/miR-149-5p/CCDC6 axis might be developed as a therapeutic target and prognostic indicator for GC patients.
2024-02-25 | GSE167512 | GEO
Project description:Warburg effect plays a crucial role in bladder cancer (Bca) development. However, the mechanism by which glycolysis is involved in Bca remains poorly understood. CircRNAs commonly play a regulatory role in tumor progression. Our study discovered and identified a novel circRNA, hsa_circ_0000235 (circ235), and investigated its role in the glycolytic process, which further results in the progression of Bca. We applied qRT-PCR to assess its clinicopathological relevance and evaluated its proliferation, migration, and glycolytic capacity. We investigated its mechanism using RNA immunoprecipitation, dual-luciferase reporters, and fluorescence in situ hybridization. The findings demonstrated that circ235 was dramatically increased in Bca tissues and was related to a worse prognosis. In vitro studies revealed that circ235 accelerated the rate of extracellular acidification and promoted glucose uptake and lactate manufacture in Bca cells. Additionally, it strengthened the capacity of Bca cells to proliferate and migrate. Experiments on animals revealed that downregulating circ235 dramatically reduced carcinogenesis and tumor growth. Cir235 activates monocarboxylate transporter 4 (MCT4) by sponging miR-330-5p, which promotes glycolysis and tumor growth. In conclusion, these findings imply that circ235 may be a viable molecular marker and therapeutic site for Bca.
2023-08-09 | GSE233933 | GEO