Abstract:
BACKGROUND:Non-small cell lung carcinomas (NSCLC) are prevalent, lethal cancers with especially grim prospects due to late-stage detection and chemoresistance. Circular RNAs (circRNAs) are non-coding RNAs that participate in tumor development. However, the role of circRNAs in NSCLC is not well known. This study investigated the role of one circRNA - circPTPRA- in NSCLC and characterized its molecular mechanism of action. METHODS:circPTPRA expression was analyzed in human NSCLC tumors and matched healthy lung tissue. We performed functional characterization in NSCLC cell lines and a mouse xenograft model of NSCLC to elucidate the molecular role of circPTPRA in epithelial-mesenchymal transitioning (EMT). We also assessed the regulatory action of circPTPRA on the microRNA miR-96-5p and its target the tumor suppressor Ras association domain-containing protein 8 (RASSF8). FINDINGS:circPTPRA was significantly downregulated in NSCLC tumors relative to matched healthy lung tissue. Lower circPTPRA levels correlated with metastasis and inferior survival outcomes in NSCLC patients. circPTPRA suppressed EMT in NSCLC cell lines and reduced metastasis in the murine xenograft model by sequestering miR-96-5p and upregulating RASSF8. Correlation analyses in patient-derived NSCLC tumor specimens supported the involvement of the circPTPRA/miR-96-5p/RASSF8/E-cadherin axis dysregulation in NSCLC tumor progression. INTERPRETATION:circPTPRA suppresses EMT and metastasis of NSCLC cell lines by sponging miR-96-5p, which upregulates the downstream tumor suppressor RASSF8. The circPTPRA/miR-96-5p/RASSF8/E-cadherin axis can be leveraged as a potential treatment avenue in NSCLC. FUND: The Key research and development projects of Anhui Province (201904a0720079), the Natural Science Foundation of Anhui Province (1908085MH240), the Graduate Innovation Program of Bengbu Medical College (Byycx1843), the National Natural Science Foundation of Tibet (XZ2017ZR-ZY033) and the Science and Technology Project of Shannan (SNKJYFJF2017-3) and Academic Subsidy Project for Top Talents in Universities of Anhui in 2019 (gxbjZD16).
journal_name
EBioMedicinejournal_title
EBioMedicineauthors
Wei S,Zheng Y,Jiang Y,Li X,Geng J,Shen Y,Li Q,Wang X,Zhao C,Chen Y,Qian Z,Zhou J,Li Wdoi
10.1016/j.ebiom.2019.05.032subject
Has Abstractpub_date
2019-06-01 00:00:00pages
182-193issn
2352-3964pii
S2352-3964(19)30340-8journal_volume
44pub_type
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