Increased expression of miR-194-5p through the circPVRL3/miR-194-5p/SOCS2 axis promotes proliferation and metastasis in pancreatic ductal adenocarcinoma by activating the PI3K/AKT signaling pathway

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Abstract

Background

MicroRNAs (miRNAs), as an indispensable type of non-coding RNA (ncRNA), participate in diverse biological processes. However, the specific regulatory mechanism of certain miRNAs in pancreatic ductal adenocarcinoma (PDAC) remains unclear.

Methods

The expression of miR-194-5p in PDAC tissue microarray and cell lines were detected by RNA-scope and real-time quantitative PCR (RT-qPCR). The function of proliferation and migration carried by miR-194-5p in vitro and vivo was observed by several functional experiments. Informatics methods and RNA sequencing data were applied to explore the target of miR-194-5p and the upstream circular RNA (circRNA) of miR-194-5p. RNA-binding protein immunoprecipitation (RIP) assay and dual-luciferase reporter assay confirmed the relationships between miR-194-5p and SOCS2 or miR-194-5p and circPVRL3. The proliferation and migration abilities of SOCS2 and circPVRL3 were accessed by rescue experiments.

Results

In this study, we aimed to clarify the molecular mechanisms of miR-194-5p, which has critical roles during PDAC progression. We found that the expression of miR-194-5p was significantly upregulated in PDAC tissue compared to tumor-adjacent tissue and was highly related to age and nerve invasion according to RNAscope and RT‒qPCR. Overexpression of miR-194-5p accelerated the cell cycle and enhanced the proliferation and migration processes according to several functional experiments in vitro and in vivo. Specifically, circPVRL3, miR-194-5p, and SOCS2 were confirmed to work as competing endogenous RNAs (ceRNAs) according to informatics methods, RIP, and dual-luciferase reporter assays. Additionally, the rescue experiments confirmed the relationship among miR-194-5p, circPVRL3, and SOCS2 mRNA. Finally, the circPVRL3/miR-194-5p/SOCS2 axis activates the PI3K/AKT signaling pathway to regulate the proliferation and metastasis of PDAC.

Conclusion

Our findings indicated that an increase of miR-194-5p caused by circPVRL3 downregulation stimulates the PI3K/AKT signaling pathway to promote PDAC progression via the circPVRL3/miR-194-5p/SOCS2 axis, which suggests that the circPVRL3/miR-194-5p/SOCS2 axis may be a potential therapeutic target for PDAC patients.

Supplementary Information

The online version contains supplementary material available at 10.1186/s12935-022-02835-0.

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Most cited references 56

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Gene set enrichment analysis: A knowledge-based approach for interpreting genome-wide expression profiles

A. Subramanian, P. Tamayo, V. K. Mootha … (2005)

Although genomewide RNA expression analysis has become a routine tool in biomedical research, extracting biological insight from such information remains a major challenge. Here, we describe a powerful analytical method called Gene Set Enrichment Analysis (GSEA) for interpreting gene expression data. The method derives its power by focusing on gene sets, that is, groups of genes that share common biological function, chromosomal location, or regulation. We demonstrate how GSEA yields insights into several cancer-related data sets, including leukemia and lung cancer. Notably, where single-gene analysis finds little similarity between two independent studies of patient survival in lung cancer, GSEA reveals many biological pathways in common. The GSEA method is embodied in a freely available software package, together with an initial database of 1,325 biologically defined gene sets.

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Cancer statistics, 2022

Rebecca Siegel, Kimberly D Miller, Hannah Fuchs … (2022)

Each year, the American Cancer Society estimates the numbers of new cancer cases and deaths in the United States and compiles the most recent data on population-based cancer occurrence and outcomes. Incidence data (through 2018) were collected by the Surveillance, Epidemiology, and End Results program; the National Program of Cancer Registries; and the North American Association of Central Cancer Registries. Mortality data (through 2019) were collected by the National Center for Health Statistics. In 2022, 1,918,030 new cancer cases and 609,360 cancer deaths are projected to occur in the United States, including approximately 350 deaths per day from lung cancer, the leading cause of cancer death. Incidence during 2014 through 2018 continued a slow increase for female breast cancer (by 0.5% annually) and remained stable for prostate cancer, despite a 4% to 6% annual increase for advanced disease since 2011. Consequently, the proportion of prostate cancer diagnosed at a distant stage increased from 3.9% to 8.2% over the past decade. In contrast, lung cancer incidence continued to decline steeply for advanced disease while rates for localized-stage increased suddenly by 4.5% annually, contributing to gains both in the proportion of localized-stage diagnoses (from 17% in 2004 to 28% in 2018) and 3-year relative survival (from 21% to 31%). Mortality patterns reflect incidence trends, with declines accelerating for lung cancer, slowing for breast cancer, and stabilizing for prostate cancer. In summary, progress has stagnated for breast and prostate cancers but strengthened for lung cancer, coinciding with changes in medical practice related to cancer screening and/or treatment. More targeted cancer control interventions and investment in improved early detection and treatment would facilitate reductions in cancer mortality.

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Natural RNA circles function as efficient microRNA sponges.

Thomas B. Hansen, Trine I. Jensen, Bettina H. Clausen … (2014)

MicroRNAs (miRNAs) are important post-transcriptional regulators of gene expression that act by direct base pairing to target sites within untranslated regions of messenger RNAs. Recently, miRNA activity has been shown to be affected by the presence of miRNA sponge transcripts, the so-called competing endogenous RNA in humans and target mimicry in plants. We previously identified a highly expressed circular RNA (circRNA) in human and mouse brain. Here we show that this circRNA acts as a miR-7 sponge; we term this circular transcript ciRS-7 (circular RNA sponge for miR-7). ciRS-7 contains more than 70 selectively conserved miRNA target sites, and it is highly and widely associated with Argonaute (AGO) proteins in a miR-7-dependent manner. Although the circRNA is completely resistant to miRNA-mediated target destabilization, it strongly suppresses miR-7 activity, resulting in increased levels of miR-7 targets. In the mouse brain, we observe overlapping co-expression of ciRS-7 and miR-7, particularly in neocortical and hippocampal neurons, suggesting a high degree of endogenous interaction. We further show that the testis-specific circRNA, sex-determining region Y (Sry), serves as a miR-138 sponge, suggesting that miRNA sponge effects achieved by circRNA formation are a general phenomenon. This study serves as the first, to our knowledge, functional analysis of a naturally expressed circRNA.

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Author and article information

Contributors

Jianbo Li: 19191353@qq.com

Shixiang Guo: 48066458@qq.com

Huaizhi Wang: wanghuaizhi@ucas.ac.cn , whuaizhi@gmail.com

Journal

Journal ID (nlm-ta): Cancer Cell Int

Journal ID (iso-abbrev): Cancer Cell Int

Title: Cancer Cell International

Publisher: BioMed Central (London )

ISSN (Electronic): 1475-2867

Publication date (Electronic): 20 December 2022

Publication date PMC-release: 20 December 2022

Publication date Collection: 2022

Volume: 22

Electronic Location Identifier: 415

Affiliations

[1 ]GRID grid.410726.6, ISNI 0000 0004 1797 8419, Savaid Medical School, , University of Chinese Academy of Sciences, ; Beijing, 100049 People’s Republic of China

[2 ]Institute of Hepatopancreatobiliary Surgery, Chongqing General Hospital, Chongqing, 401147 People’s Republic of China

[3 ]Chongqing Key Laboratory of Intelligent Medicine Engineering for Hepatopancreatobiliary Diseases, Chongqing, 401147 People’s Republic of China

[4 ]GRID grid.203458.8, ISNI 0000 0000 8653 0555, Chongqing Medical University, ; Chongqing, 400016 People’s Republic of China

[5 ]GRID grid.410726.6, ISNI 0000 0004 1797 8419, College of Life Sciences, , University of Chinese Academy of Sciences, ; Beijing, 100049 People’s Republic of China

Article

Publisher ID: 2835

DOI: 10.1186/s12935-022-02835-0

PMC ID: 9764499

PubMed ID: 36539807

SO-VID: ad3d44f5-f611-4d8e-9efa-7238d004fcf9

License:

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver ( http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

History

Date received : 2 November 2022

Date accepted : 11 December 2022

Funding

Funded by: Natural Science Foundation of Chongqing

Award ID: cstc2020jcyj-msxmX0707 and cstc2022ycjh-bgzxm0137

Award Recipient : Shixiang Guo

Funded by: Science and Health Research Project of Chongqing

Award ID: 2021MSXM344

Award Recipient : Shixiang Guo

Funded by: Natural Science Foundation of Yuzhong District of Chongqing

Award ID: 20210160

Award Recipient : Shixiang Guo

Funded by: National Natural Science Foundation of China

Award ID: 82072723

Award Recipient : Huaizhi Wang

Custom metadata

ScienceOpen disciplines: Oncology & Radiotherapy

Keywords: circular rna,mir-194-5p,cell cycle,pancreatic ductal adenocarcinoma

Data availability:

ScienceOpen disciplines: Oncology & Radiotherapy

Keywords: circular rna, mir-194-5p, cell cycle, pancreatic ductal adenocarcinoma

Increased expression of miR-194-5p through the circPVRL3/miR-194-5p/SOCS2 axis promotes proliferation and metastasis in pancreatic ductal adenocarcinoma by activating the PI3K/AKT signaling pathway

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Abstract

Background

Methods

Results

Conclusion

Supplementary Information

Related collections

Karger: Oncology

Most cited references 56

Gene set enrichment analysis: A knowledge-based approach for interpreting genome-wide expression profiles

Cancer statistics, 2022

Natural RNA circles function as efficient microRNA sponges.

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