A Novel Circular RNA circPLCE1 Facilitates the Malignant Progression of Colorectal Cancer by Repressing the SRSF2-dependent PLCE1 pre-RNA Splicing

2021 ◽  
Author(s):  
Zhi-Lei Chen ◽  
Hong-Yu Chen ◽  
Lei Yang ◽  
Xiang-Nan Li ◽  
Zhenjun Wang
Keyword(s):  
Colorectal Cancer ◽  
Cell Proliferation ◽  
Rna Splicing ◽  
Ectopic Expression ◽  
Circular Rna ◽  
Malignant Progression ◽  
Circular Rnas ◽  
Normal Tissues

Abstract Background: Studies have demonstrated that circular RNAs (circRNAs) play important roles in various types of cancer; however, the mechanisms of circRNAs located in the nucleus have rarely been explored. Here, we reported a novel circular RNA circPLCE1 facilitates the malignant progression of colorectal cancer (CRC) via repression of SRSF2-dependent PLCE1 pre-RNA splicing. Methods: qRT-PCR was used to determine the expression of circPLCE1 in CRC tissues and cells. CCK-8, transwell and flow cytometric assays were used to assess the role of circPLCE1 in CRC cell proliferation, migration and apoptosis, respectively. Animal study was carried to test the role of circPLCE1 in vivo. Further, catRAPID and RPISeq were applied to predict the possible binding protein of circPLCE1. RNA fractionation and RIP assays were used to confirm the RNA-protein interaction. Results: In this study, we found that circPLCE1 was significantly downregulated in CRC tissues compared with adjacent normal tissues. However, circPLCE1 knockdown suppresses CRC cell proliferation, migration, invasion and increased apoptosis. Nude mice experiments showed that ectopic expression of circPLCE1 dramatically increased tumor growth in vivo. Mechanically, circPLCE1 directly binding to SRSF2 protein, repressing SRSF2-dependent PLCE1 pre-RNA splicing, resulting in the progression of CRC. Individually mutating the binding sites of circPLCE1 derepressed the production of PLCE1 mRNA. Conclusions: Our studies revealed a novel molecular mechanism in the regulation of PLCE1 and implicated a new function of circular RNA, supporting the pursuit of circPLCE1 as a potential tool for future CRC treatment.

scholarly journals hsa_circ_0000231 Promotes Colorectal Cancer Cell Growth Through Upregulation of CCND2 by IGF2BP3/miR-375 Dual Pathway

2020 ◽  
Author(s):  
Wei Zhang ◽  
Bo Wang ◽  
Yang Yang ◽  
Zhen Zhang ◽  
Quan Wang ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Cell Proliferation ◽  
In Situ Hybridization ◽  
Luciferase Reporter ◽  
Circular Rnas ◽  
Cancer Cell Growth ◽  
Normal Tissues

Abstract Background circular RNAs (circRNAs) recently have been emerged as vital regulators for involvement of initiation and progression of diverse kinds of human cancers. This study aimed to investigate the role of circRNAs in colorectal cancer (CRC). Methods The expression profile of circRNAs in 5 pairs of CRC tissues and adjacent normal tissues were analyzed by Microarray. Quantitative real-time PCR and in situ hybridization and Base Scope Assay were used to determine the level and prognostic values of hsa_circ_0000231. Then, functional experiments in vitro and in vivo were performed to investigate the effects of hsa_circ_0000231 on cell proliferation. Mechanistically, fluorescent in situ hybridization, dual luciferase reporter assay, RNA pull-down and RNA immunoprecipitation experiments were performed to confirm the interaction between hsa_circ_0000231 and IGF2BP3 or has_miR-375. Results hsa_circ_0000231 was evidently up-regulated in CRC primary tissues, which was indicated to poor prognosis of CRC patients. The results demonstrated that hsa_circ_0000231 could promote CRC cell proliferation as well as tumorigenesis in vitro and in vivo. Mechanistic analysis showed that hsa_circ_0000231 might on the one hand act as a ceRNA (competing endogenous RNA) of miR-375 to regulate cyclin D2 (CCND2), and on the other hand bind to IGF2BP3 protein to protect CCND2 from being degraded. Conclusion Our findings suggest that hsa_circ_0000231 facilitated CRC progression by sponging miR-375 or binding to IGF2BP3 to modulate CCND2. This discovery implied that has_circ_0000231 may be a potential new diagnostic and therapeutic biomarker for CRC.

scholarly journals Identification of circular RNA hsa_circ_0044556 and its effect on the progression of colorectal cancer

2020 ◽  
Author(s):  
Liang Jing ◽  
Junhui Wu ◽  
Xiaocheng Tang ◽  
Min Ma ◽  
Fei Long ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Cell Lines ◽  
Tumor Stage ◽  
Circular Rna ◽  
Gene Expression Omnibus ◽  
Migration And Invasion ◽  
Circular Rnas ◽  
Normal Tissues ◽  
Node Metastasis

Abstract Background: Circular RNAs (circRNAs) are a novel class of noncoding RNAs. Increasing evidence indicates that circRNAs play an important role in the occurrence and development of tumors. However, the role of circRNA hsa_circ_0044556 in the progression of colorectal cancer (CRC) remains unclear. Methods: First, we searched for differentially expressed circRNAs using a circRNA microarray in paired CRC and adjacent normal tissues. The circRNA hsa_circ_0044556 was screened out from the existing CRC circRNA microarray in the Gene Expression Omnibus database and our microarray. The clinical significance of hsa_circ_0044556 expression level in CRC patients was then investigated. Finally, the functions of the targets of this circRNA were determined in CRC cell lines.Results:Hsa_circ_0044556 was highly expressed in CRC patients and was positively correlated with tumor stage and lymph node metastasis. In CRC cell lines, the proliferation, migration, and invasion of cancer cells were inhibited by knocking down hsa_circ_0044556 expression.Conclusion: Hsa_circ_0044556 promoted the progression of CRC. It is possible that hsa_circ_0044556 will become a novel biomarker or therapeutic target for CRC.

scholarly journals MiR-423-3p Enhances Cell Growth Through Inhibition of p21Cip1/Waf1 in Colorectal Cancer

2015 ◽  
Vol 37 (3) ◽  
pp. 1044-1054 ◽  
Author(s):  
Hong-tao Li ◽  
Hui Zhang ◽  
Yong Chen ◽  
Xian-fu Liu ◽  
Jun Qian
Keyword(s):  
Colorectal Cancer ◽  
Cell Proliferation ◽  
Cell Growth ◽  
Vital Role ◽  
Luciferase Reporter ◽  
Normal Tissues ◽  
Non Coding Rnas ◽  
And Migration

Background/Aims: Colorectal cancer (CRC) is one of the leading causes of cancer-related deaths globally, with many oncogenes and tumor suppressors involved. The miRNAs are small non-coding RNAs known to play a vital role in the pathogenesis of CRC. The miR-423-3p was reported to act as an oncogene; however, its role in CRC growth remains unknown. Methods: qPCR assay was used to detect miR-423-3p expression in CRC specimens. Cell proliferation assay and transwell assay were conducted to evaluate CRC cell proliferation and migration. Luciferase reporter assay was to identify the target gene of miR-423-3p. And tumorigenesis model was established to test the role of miR-423-3p in CRC development in vivo. Results: Here, we showed that miR-423-3p was significantly up regulated in CRC tissues and cells compared with normal tissues and cells. Overexpression of miR-423-3p promoted CRC cell proliferation via enhancing the G1/S transition phase of the cell cycle, while inhibition of miR-423-3p repressed cell growth. Further studies showed that p21Cip1/Waf1 mediated the function of miR-423-3p, and overexpression of p21Cip1/Waf1 reversed the augmented effect of miR-423-3p on cell proliferation. Importantly, all these data were validated in the tumorigenesis assay in vivo. Conclusions: In conclusion, our findings demonstrated a critical impact of miR-423-3p on CRC growth.

scholarly journals Circ_0026416 downregulation blocks the development of colorectal cancer through depleting MYO6 expression by enriching miR-545-3p

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Lei Zhang ◽  
Ranran Yu ◽  
Chunhua Li ◽  
Yu Dang ◽  
Xiaoyu Yi ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Cell Proliferation ◽  
Colony Formation ◽  
Luciferase Reporter ◽  
Circular Rnas ◽  
List Type ◽  
Mesenchymal Transition

Abstract Background Emerging evidence reveals that the initiation and development of human cancers, including colorectal cancer (CRC), are associated with the deregulation of circular RNAs (circRNAs). Our study intended to disclose the role of circ_0026416 in the malignant behaviors of CRC. Methods The detection for circ_0026416 expression, miR-545-3p expression, and myosin VI (MYO6) mRNA expression was performed using quantitative real-time PCR (qPCR). CCK-8 assay, colony formation assay, transwell assay, and flow cytometry assay were applied for functional analysis to monitor cell proliferation, migration, invasion, and apoptosis. The protein levels of MYO6 and epithelial mesenchymal-transition (EMT) markers were detected by western blot. Mouse models were used to determine the role of circ_0026416 in vivo. The potential relationship between miR-545-3p and circ_0026416 or MYO6 was verified by dual-luciferase reporter assay and RIP assay. Results The expression of circ_0026416 was increased in CRC tumor tissues and cell lines. Circ_0026416 downregulation inhibited CRC cell proliferation, colony formation, migration, invasion, and EMT but induced cell apoptosis in vitro, and circ_0026416 knockdown also blocked tumor growth in vivo. MiR-545-3p was a target of circ_0026416, and rescue experiments indicated that circ_0026416 knockdown blocked CRC development by enriching miR-545-3p. In addition, miR-545-3p targeted MYO6 and inhibited MYO6 expression. MiR-545-3p enrichment suppressed CRC cell malignant behaviors by sequestering MYO6. Importantly, circ_0026416 knockdown depleted MYO6 expression by enriching miR-545-3p. Conclusion Circ_0026416 downregulation blocked the development of CRC through depleting MYO6 expression by enriching miR-545-3p. Highlights Circ_0026416 downregulation inhibits CRC development in vitro and in vivo. Circ_0026416 regulates the expression of MYO6 by targeting miR-545-3p. Circ_0026416 governs the miR-545-3p/MYO6 axis to regulate CRC progression.

hsa_circ_0000231 promotes colorectal cancer cell growth through upregulation of CCND2 by IGF2BP3/miR-375 dual pathway 

2020 ◽  
Author(s):  
Wei Zhang ◽  
Bo Wang ◽  
Yang Yang ◽  
Zhen Zhang ◽  
Quan Wang ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Cell Proliferation ◽  
Expression Profiles ◽  
Luciferase Reporter ◽  
Circular Rnas ◽  
Cancer Cell Growth ◽  
Normal Tissues

Abstract Background and aim Circular RNAs (circRNAs) have emerged as vital regulators of the initiation and progression of diverse kinds of human cancers. This study aimed to investigate the role of circRNAs in colorectal cancer (CRC). Methods The expression profiles of circRNAs in five pairs of CRC tissues and adjacent normal tissues were analyzed using microarray. Quantitative real-time polymerase chain reaction, in situ hybridization, and BaseScope Assay were used to determine the level and prognostic values of hsa_circ_0000231. Then, in vitro and in vivo functional experiments were performed to investigate the effects of hsa_circ_0000231 on cell proliferation. Mechanistically, fluorescence in situ hybridization, dual-luciferase reporter assay, and RNA pull-down and RNA immunoprecipitation experiments were performed to confirm the interaction between hsa_circ_0000231 and Insulin-like growth factor 2 mRNA-binding protein 3(IGF2BP3) or has_miR-375. Results The expression of hsa_circ_0000231 was upregulated in CRC primary tissues, which indicated poor prognosis of patients with CRC. The results demonstrated that hsa_circ_0000231 could promote CRC cell proliferation as well as tumorigenesis in vitro and in vivo. The mechanistic analysis showed that hsa_circ_0000231 might, on the one hand, act as a competing endogenous RNA of miR-375 to promote cyclin D2 (CCND2) and, on the other hand, bind to the IGF2BP3 protein to prevent CCND2 degradation. Conclusion The findings suggested that hsa_circ_0000231 facilitated CRC progression by sponging miR-375 or binding to IGF2BP3 to modulate CCND2, implying that has_circ_0000231 might be a potential new diagnostic and therapeutic biomarker of CRC.

scholarly journals Identification of circular RNA hsa_circ_0044556 and its effect on the development and progression of colorectal cancer

2020 ◽  
Author(s):  
Liang Jing ◽  
Junhui Wu ◽  
Xiaocheng Tang ◽  
Min Ma ◽  
Fei Long ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Cell Lines ◽  
Tumor Stage ◽  
Circular Rna ◽  
Gene Expression Omnibus ◽  
Migration And Invasion ◽  
Circular Rnas ◽  
Normal Tissues ◽  
Node Metastasis

Abstract Background Circular RNAs (circRNAs) are a novel class of noncoding RNAs. Increasing evidence indicates that circRNAs play an important role in the occurrence and development of tumors. However, the role of circRNAs in the development and progression of colorectal cancer (CRC) remains unclear. Methods First, we searched for differentially expressed circRNAs using a circRNA microarray in paired CRC and adjacent normal tissues. The circRNA hsa_circ_0044556 was screened out from the existing CRC circRNA microarray in the Gene Expression Omnibus database and our microarray. The clinical significance of hsa_circ_0044556 expression level in CRC patients was then investigated. Finally, the functions of the targets of this circRNA were determined in CRC cell lines. Results hsa_circ_0044556 was highly expressed in CRC patients and was positively correlated with tumor stage and lymph node metastasis. In CRC cell lines, the proliferation, migration, and invasion of cancer cells were inhibited by knocking down hsa_circ_0044556 expression. Conclusion hsa_circ_0044556 promoted the development and progression of CRC. It is possible that hsa_circ_0044556 will become a novel biomarker or therapeutic target for CRC.

scholarly journals Identification of circular RNA hsa_circ_0044556 and its effect on the progression of colorectal cancer

2020 ◽  
Author(s):  
Liang Jing ◽  
Junhui Wu ◽  
Xiaocheng Tang ◽  
Min Ma ◽  
Fei Long ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Cell Lines ◽  
Tumor Stage ◽  
Circular Rna ◽  
Gene Expression Omnibus ◽  
Migration And Invasion ◽  
Circular Rnas ◽  
Normal Tissues ◽  
Node Metastasis

Abstract Background: Circular RNAs (circRNAs) are a novel class of noncoding RNAs. Increasing evidence indicates that circRNAs play an important role in the occurrence and development of tumors. However, the role of circRNA hsa_circ_0044556 in the progression of colorectal cancer (CRC) remains unclear. Methods: First, we searched for differentially expressed circRNAs using a circRNA microarray in paired CRC and adjacent normal tissues. The circRNA hsa_circ_0044556 was screened out from the existing CRC circRNA microarray in the Gene Expression Omnibus database and our microarray. The clinical significance of hsa_circ_0044556 expression level in CRC patients was then investigated. Finally, the functions of the targets of this circRNA were determined in CRC cell lines.Results:Hsa_circ_0044556 was highly expressed in CRC patients and was positively correlated with tumor stage and lymph node metastasis. In CRC cell lines, the proliferation, migration, and invasion of cancer cells were inhibited by knocking down hsa_circ_0044556 expression.Conclusion: Hsa_circ_0044556 promoted the progression of CRC. It is possible that hsa_circ_0044556 will become a novel biomarker or therapeutic target for CRC.

scholarly journals hsa_circ_0000231 promotes colorectal cancer cell growth through upregulation of CCND2 by IGF2BP3/miR-375 dual pathway

2020 ◽  
Author(s):  
Wei Zhang ◽  
Bo Wang ◽  
Yang Yang ◽  
Zhen Zhang ◽  
Quan Wang ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Cell Proliferation ◽  
Expression Profiles ◽  
Luciferase Reporter ◽  
Circular Rnas ◽  
Cancer Cell Growth ◽  
Normal Tissues

Abstract Background and aim Circular RNAs (circRNAs) have emerged as vital regulators of the initiation and progression of diverse kinds of human cancers. This study aimed to investigate the role of circRNAs in colorectal cancer (CRC).Methods The expression profiles of circRNAs in five pairs of CRC tissues and adjacent normal tissues were analyzed using microarray. Quantitative real-time polymerase chain reaction, in situ hybridization, and BaseScope Assay were used to determine the level and prognostic values of hsa_circ_0000231. Then, in vitro and in vivo functional experiments were performed to investigate the effects of hsa_circ_0000231 on cell proliferation. Mechanistically, fluorescence in situ hybridization, dual-luciferase reporter assay, and RNA pull-down and RNA immunoprecipitation experiments were performed to confirm the interaction between hsa_circ_0000231 and Insulin-like growth factor 2 mRNA-binding protein 3(IGF2BP3) or has_miR-375. Results The expression of hsa_circ_0000231 was upregulated in CRC primary tissues, which indicated poor prognosis of patients with CRC. The results demonstrated that hsa_circ_0000231 could promote CRC cell proliferation as well as tumorigenesis in vitro and in vivo. The mechanistic analysis showed that hsa_circ_0000231 might, on the one hand, act as a competing endogenous RNA of miR-375 to promote cyclin D2 (CCND2) and, on the other hand, bind to the IGF2BP3 protein to prevent CCND2 degradation. Conclusion The findings suggested that hsa_circ_0000231 facilitated CRC progression by sponging miR-375 or binding to IGF2BP3 to modulate CCND2, implying that has_circ_0000231 might be a potential new diagnostic and therapeutic biomarker of CRC.

scholarly journals Identification of circRNA circ-CSPP1 as a potent driver of colorectal cancer by directly targeting the miR-431/LASP1 axis

2021 ◽  
Vol 16 (1) ◽  
pp. 523-536
Author(s):  
Minghao Li ◽  
Jianbin Zhuang ◽  
Di Kang ◽  
Yuzhuo Chen ◽  
Weiliang Song
Keyword(s):  
Colorectal Cancer ◽  
Cancer Biology ◽  
Spindle Pole ◽  
Circular Rnas ◽  
Cell Progression ◽  
Crc Management ◽  
Common Malignancy

Abstract Colorectal cancer (CRC) is the third most common malignancy worldwide. Circular RNAs (circRNAs) have been implicated in cancer biology. The purpose of the current work is to investigate the precise parts of circRNA centrosome and spindle pole-associated protein 1 (circ-CSPP1) in the progression of CRC. Our data showed that circ-CSPP1 was significantly overexpressed in CRC tissues and cells. The knockdown of circ-CSPP1 attenuated cell proliferation, migration, invasion and promoted apoptosis in vitro and weakened tumor growth in vivo. circ-CSPP1 directly targeted miR-431, and circ-CSPP1 knockdown modulated CRC cell progression in vitro via upregulating miR-431. Moreover, LIM and SH3 protein 1 (LASP1) was a functional target of miR-431 in modulating CRC cell malignant progression. Furthermore, circ-CSPP1 in CRC cells functioned as a posttranscriptional regulator on LASP1 expression by targeting miR-431. Our present study identified the oncogenic role of circ-CSPP1 in CRC partially by the modulation of the miR-431/LASP1 axis, providing evidence for circ-CSPP1 as a promising biomarker for CRC management.

scholarly journals Sevoflurane inhibits malignant progression of colorectal cancer via hsa_circ_0000231-mediated miR-622

2021 ◽  
Vol 28 (1) ◽  
Author(s):  
Jingpeng Wang ◽  
Shuyuan Li ◽  
Gaofeng Zhang ◽  
Huihua Han
Keyword(s):  
Colorectal Cancer ◽  
Cell Proliferation ◽  
Cell Apoptosis ◽  
Volatile Anesthetic ◽  
Tumor Formation ◽  
Luciferase Reporter ◽  
Migration And Invasion ◽  
Circular Rnas

Abstract Background Sevoflurane (Sev), a commonly used volatile anesthetic, has been reported to inhibit the process of colorectal cancer (CRC). Circular RNAs (circRNAs) are revealed to participate in the pathogenesis of CRC. This study aims to reveal the mechanism of hsa_circ_0000231 in Sev-mediated CRC progression. Methods The expression of hsa_circ_0000231 and microRNA-622 (miR-622) was detected by quantitative real-time polymerase chain reaction (qRT-PCR). Protein level was determined by western blot analysis. Cell proliferation was investigated by 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT), cell colony formation and DNA content quantitation assays. Cell apoptosis was detected by Annexin V-fluorescein isothiocyanate and propidium iodide double staining and caspase 3 activity assays. Cell migration and invasion were investigated by wound-healing and transwell invasion assays, respectively. The putative relationship between hsa_circ_0000231 and miR-622 was predicted by circular RNA Interactome online database, and identified by dual-luciferase reporter and RNA immunoprecipitation assays. The impacts of hsa_circ_0000231 on Sev-mediated tumor formation in vivo were presented by in vivo assay. Results Hsa_circ_0000231 expression was upregulated, while miR-622 was downregulated in CRC tissues and cells compared with control groups. Sev treatment decreased hsa_circ_0000231 expression, but increased miR-622 expression in CRC cells. Sev treatment suppressed cell proliferation, migration and invasion, and induced cell apoptosis. Hsa_circ_0000231 overexpression restored Sev-mediated CRC progression in vitro. Additionally, hsa_circ_0000231 acted as a sponge of miR-622, and miR-622 inhibitors reversed the impacts of hsa_circ_0000231 silencing on CRC process. Furthermore, Sev treatment inhibited tumor growth by regulating hsa_circ_0000231 in vivo. Conclusion Hsa_circ_0000231 attenuated Sev-aroused repression impacts on CRC development by sponging miR-622. This findings may provide an appropriate anesthetic protocol for CRC sufferers undergoing surgery.

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