Int J Med Sci 2017; 14(10):1022-1030. doi:10.7150/ijms.18392

Research Paper

LncRNA AFAP1-AS Functions as a Competing Endogenous RNA to Regulate RAP1B Expression by sponging miR-181a in the HSCR

Guanglin Chen1, 3*, Lei Peng1, 3*, Zhongxian Zhu1, 3*, Chunxia Du1, 3, Ziyang Shen1, 3, Rujin Zang1, 3, Yang Su1, 3, Yankai Xia1, 2, Weibing Tang1, 3✉

1. State Key Laboratory of Reproductive Medicine, Institute of Toxicology, School of Public Health, Nanjing Medical University, Nanjing 211166, China;
2. Key Laboratory of Modern Toxicology (Nanjing Medical University), Ministry of Education, China;
3. Department of Pediatric Surgery, Children's Hospital of Nanjing Medical University.
* These authors contributed equally

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Citation:
Chen G, Peng L, Zhu Z, Du C, Shen Z, Zang R, Su Y, Xia Y, Tang W. LncRNA AFAP1-AS Functions as a Competing Endogenous RNA to Regulate RAP1B Expression by sponging miR-181a in the HSCR. Int J Med Sci 2017; 14(10):1022-1030. doi:10.7150/ijms.18392. Available from http://www.medsci.org/v14p1022.htm

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Abstract

Background: Long noncoding RNAs (lncRNAs) have recently emerged as important regulators in a broad spectrum of cellular processes including development and disease. Despite the known engagement of the AFAP1-AS in several human diseases, its biological function in Hirschsprung disease (HSCR) remains elusive.

Methods: We used qRT-PCR to detect the relative expression of AFAP1-AS in 64 HSCR bowel tissues and matched normal intestinal tissues. The effects of AFAP1-AS on cell proliferation, migration, cell cycle, apoptosis and cytoskeletal organization were evaluated using CCK-8, transwell assay, flow cytometer analysis and immunofluorescence, in 293T and SH-SY5Y cell lines, respectively. Moreover, the competing endogenous RNA (ceRNA) activity of AFAP1-AS on miR-181a was investigated via luciferase reporter assay and immunoblot analysis.

Results: Aberrant inhibition of AFAP1-AS was observed in HSCR tissues. Knockdown of AFAP1-AS in 293T and SH-SY5Y cells suppressed cell proliferation, migration, and induced the loss of cell stress filament integrity, possibly due to AFAP1-AS sequestering miR-181a in HSCR cells. Furthermore, AFAP1-AS could down-regulate RAP1B via its competing endogenous RNA (ceRNA) activity on miR-181a.

Conclusions: These findings suggest that aberrant expression of lncRNA AFAP1-AS, a ceRNA of miR-181a, may involve in the onset and progression of HSCR by augmenting the miR-181a target gene, RAP1B.

Keywords: AFAP1-AS, Hirschsprung disease, Competing endogenous RNA, miR-181a.