Abstract
Growing evidence has shown the oncogenic role of long non-coding RNA HOXA-AS3 in the progression of several types of cancers, while the effect of HOXA-AS3 on colorectal cancer (CRC) remains unclear. In this study, HOXA-AS3 was significantly over-expressed in CRC clinical samples and human CRC cell lines (SW480, SW620, HCT116, COLO205, and LOVO). HOXA-AS3 knockdown was further achieved by specific siRNAs in COLO205 and LOVO cell lines. The depletion of HOXA-AS3 remarkably inhibited cell proliferation, induced cell cycle arrest, and promoted cell apoptosis in CRC cell lines. Additionally, HOXA-AS3 knockdown was determined to facilitate miR-4319 expression and reduce expression level of sphingolipid transporter 2 (SPNS2) in CRC cell lines. The dual luciferase reporter assay suggested that HOXA-AS3 acted as a sponge of miR-4319, and miR-4319 further directly targeted SPNS2 for expression regulation. Besides, HOXA-AS3 was determined to mediate CRC cell proliferation and apoptosis via miR-4319/SPNS2 axis. Moreover, tumorigenesis experiment validated that HOXA-AS3 promoted CRC progression in vivo by regulating miR-4319, SPNS2, and protein kinase B (AKT) signaling. In summary, this study reveals the novel role of HOXA-AS3 in pathogenesis of CRC and provides a candidate for CRC therapeutic target.
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Funding
This study was funded by grants from the Natural Science Foundation of Heilongjiang Province (No. LH2020H121), the Haiyan Foundation of Harbin Medical University Cancer Hospital (No. JJQN2020-16), and the Graduate Research and Practice Innovation Project of Harbin Medical University (No.YJSKYCX2019-53HYD).
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YJ and JSG designed the experiments. YJ and XYY performed the majority of experiments. HXS and XYG analyzed the data. YJ and JSG drafted and revised the manuscript. The authors declare that all data were generated in-house and that no paper mill was used.
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This study involves human participants and animals. The collection of clinical specimen was approved by the Committee of Harbin Medical University Cancer Hospital. Moreover, all animal experiments were also approved by Committee of Harbin Medical University Cancer Hospital, and experimental procedures were conducted under the guideline to the care and use of experimental animals.
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Key Points
1. HOXA-AS3 was over-expressed in CRC clinical samples and human CRC cell lines.
2. HOXA-AS3 knockdown inhibits CRC progression in vivo and in vitro.
3. HOXA-AS3 acts as a sponge of miR-4319, which further regulates expression of SPNS2 in CRC cells.
4. HOXA-AS3 knockdown inhibits cell proliferation and induces apoptosis in CRC cells via miR-4319/SPNS2 axis.
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Jiang, Y., Yu, Xy., Sun, Hx. et al. Long non-coding RNA HOXA-AS3 facilitates the malignancy in colorectal cancer by miR-4319/SPNS2 axis. J Physiol Biochem 77, 653–666 (2021). https://doi.org/10.1007/s13105-021-00832-x
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DOI: https://doi.org/10.1007/s13105-021-00832-x