Abstract
The biologic function as well as the mechanism of long noncoding RNAs (lncRNAs) in colorectal cancer (CRC) still remain largely unknown. Long noncoding RNA FGD5 antisense RNA 1 (FGD5-AS1) has been reported to have a promotive effect on other human cancers, but its function in CRC still remains unknown. The expression levels of long noncoding RNA FGD5-AS1, CDCA7 mRNA, and miR-302e were assessed by RT-qPCR. The protein levels of CDCA7 were assessed by Western blot. The function of FGD5-AS1 was detected using cell viability assay, 5-ethynyl-2′-deoxyuridine (EdU) assay, transwell, and caspase-3 activity assay. Additionally, the microRNAs (miRNAs) sponge potential of FGD5-AS1 was examined by RNA immunoprecipitation assay, RNA pull-down assay, and luciferase reporter assay. FGD5-AS1 was increased in colorectal cancer cell lines compared to normal cell lines. Inhibition of FGD5-AS1 suppressed cell proliferation, migration, invasion, and accelerated cell apoptosis in CRC. FGD5-AS1 competitively bound with miR-302e to modulate CDCA7. The inhibiting effects of FGD5-AS1 knockdown on CRC cell proliferation, migration, and invasion, and the promoting effects on CRC cell apoptosis could be revived by miR-302e suppression or CDCA7 upregulation. LncRNA FGD5-AS1 could promote CRC progression through sponging miR-302e and upregulating CDCA7. FGD5-AS1 might serve as a potential therapeutic target for CRC.
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Supplementary Figure 1
(A) RT-qPCR detected FGD5-AS1 expression in CRC cells after transfection with pcDNA3.1/FGD5-AS1 or the empty vector. (B) CCK-8 assay detected CRC cell viability. (C) EdU assay evaluated CRC cell proliferation. (D) Casepase-3 activity assay measured CRC cell apoptosis. (E-F) Transwell assays assessed CRC cell migration and invasion. All the experiments were performed in triplicate. **P < 0.01, ***P < 0.001. (PNG 359 kb)
Supplementary Figure 2
(A) RT-qPCR detected the expression variation of the 16 miRNAs predicted to interact with FGD5-AS1. Data was presented as the sh-FGD5-AS1-2/sh-NC ratio. (B) RT-qPCR examined CDCA7 mRNA levels after transfection. (C) Western blot tested CDCA7 protein levels after transfection. All the experiments were performed in triplicate. *P < 0.05, **P < 0.01. (PNG 214 kb)
Supplementary Figure 3
(A-B) RT-qPCR and western blot confimed the knockdown efficiency of sh-CDCA7-1/2. (C) CCK-8 assay detected CRC cell viability. (D) EdU assay evaluated CRC cell proliferation. (E) Casepase-3 activity assay measured CRC cell apoptosis. (F-G) Transwell assays assessed CRC cell migration and invasion. All the experiments were performed in triplicate. *P < 0.05, **P < 0.01. (PNG 819 kb)
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Li, D., Jiang, X., Zhang, X. et al. Long noncoding RNA FGD5-AS1 promotes colorectal cancer cell proliferation, migration, and invasion through upregulating CDCA7 via sponging miR-302e. In Vitro Cell.Dev.Biol.-Animal 55, 577–585 (2019). https://doi.org/10.1007/s11626-019-00376-x
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DOI: https://doi.org/10.1007/s11626-019-00376-x