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CircRNA_OTUD7A upregulates FOXP1 expression to facilitate the progression of diffuse large B-cell lymphoma via acting as a sponge of miR-431-5p

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Abstract

Background

A growing number of studies have shown that circular RNA (circRNA) is an important regulator molecule in cancer progression, but it has been poorly studied in diffuse large b-cell lymphoma (DLBCL).

Objective

This study aimed to explore the role of circ_OTUD7A in DLBCL.

Methods

Relative expression levels of circ_OTUD7A, microRNA (miR)-431-5p and forkhead box P1 (FOXP1) were determined by quantitative real-time PCR (qRT-PCR). The proliferation of cells was elevated by colony formation assay and MTT assay. Western blot (WB) analysis was employed to measure the protein levels of proliferation marker, epithelial-mesenchymal transition (EMT) markers, cyclin marker, apoptosis markers and FOXP1. Moreover, the apoptosis, cell cycle process, migration and invasion of cells were detected using flow cytometry and transwell assay, respectively. In addition, the interaction between miR-431-5p and circ_OTUD7A or FOXP1 was confirmed by dual-luciferase reporter assay.

Results

Circ_OTUD7A was highly expressed in DLBCL, and its knockdown could inhibit DLBCL cell proliferation and metastasis, while promote cell cycle arrest and apoptosis. Similarly, FOXP1 also was upregulated in DLBCL, and its silencing could restrain the progression of DLBCL cells. Further experiments revealed that circ_OTUD7A could sponge miR-431-5p and miR-431-5p could target FOXP1. MiR-431-5p inhibitor could reverse the suppressive effect of circ_OTUD7A silencing on DLBCL progression, and FOXP1 overexpression also could reverse the inhibitory effect of miR-431-5p mimic on DLBCL progression.

Conclusion

Circ_OTUD7A promoted the progression of DLBCL by regulating the miR-431-5p/FOXP1 axis, which suggested that circ_OTUD7A might function as an oncogene in DLBCL.

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Availability of data and materials

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Authors and Affiliations

Authors

Contributions

WL was principal investigator, designed the study. LL supervised experiments. SY wrote the manuscript. XL. All authors agreed and approved the manuscript to be published.

Corresponding author

Correspondence to Suiyan Ye.

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Conflict of interest

Wei Liu, Lei Lei, Xiaoying Liu and Suiyan Ye declare that they have no conflict of interest.

Ethical approval

Enrolled patients signed informed consent, and this study was approved by the Ethics Committee of The First Hospital of Yulin.

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Supplementary Information

Below is the link to the electronic supplementary material.

13258_2021_1094_MOESM1_ESM.tif

Supplementary Fig. 1 The protein levels of CyclinD1, Bcl-2 and Bax in each treatment group. (A-C) WB analysis was used to detect the protein levels of CyclinD1, Bcl-2 and Bax in U2932 and TMD8 cells transfected with si-circ_OTUD7A or si-NC. (D-F) The protein levels of CyclinD1, Bcl-2 and Bax in U2932 and TMD8 cells transfected with sh-FOXP1 or sh-NC were measured by WB analysis. (G-I) U2932 and TMD8 cells were transfected with si-NC, si-circ_OTUD7A, si-circ_OTUD7A + anti-miR-NC or si-circ_OTUD7A + anti-miR-431-5p. WB analysis was performed to examine the protein levels of CyclinD1, Bcl-2 and Bax. (J-L) U2932 and TMD8 cells were transfected with miR-NC, miR-431-5p, miR-431-5p + pcDNA or miR-431-5p + FOXP1. The protein levels of CyclinD1, Bcl-2 and Bax were determined using WB analysis. *P < 0.05

13258_2021_1094_MOESM2_ESM.tif

Supplementary Fig. 2 The expression of candidate miRNAs for circ_OTUD7A. U2932 and TMD8 cells were transfected with si-circ_OTUD7A or si-NC. The expression of miR-431-5p and miR-324-5p in U2932 cells (A) and TMD8 cells (B) was detected by qRT-PCR. *P < 0.05

13258_2021_1094_MOESM3_ESM.tif

Supplementary Fig. 3 The representative image for Fig. 6. (A) The images of colony formation assay for Fig. 6B. (B) The images of cell cycle for Fig. 6F-G. (C) The image of cell apoptosis for Fig. 6H. (D) The image of cell migration for Fig. 6I. (E) The images of cell invasion for Fig. 6J

13258_2021_1094_MOESM4_ESM.tif

Supplementary Fig. 4 The representative image for Fig. 7. (A) The images of colony formation assay for Fig. 7C. (B) The images of cell cycle for Fig. 7G-H. (C) The image of cell apoptosis for Fig. 7I. (D) The image of cell migration for Fig. 7J. (E) The images of cell invasion for Fig. 7K

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Liu, W., Lei, L., Liu, X. et al. CircRNA_OTUD7A upregulates FOXP1 expression to facilitate the progression of diffuse large B-cell lymphoma via acting as a sponge of miR-431-5p. Genes Genom 43, 653–667 (2021). https://doi.org/10.1007/s13258-021-01094-z

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  • DOI: https://doi.org/10.1007/s13258-021-01094-z

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