| Summary: | Jing Xie,1 Yanyan Zheng,2 Xiaomin Xu,3 Congcong Sun,3 Mingfen Lv4 1Department of Dermatology, The Wenzhou Third Clinical Institute Affiliated to Wenzhou Medical University, Wenzhou People’s Hospital, Wenzhou 325000, People’s Republic of China; 2Department of Neurology, The Wenzhou Third Clinical Institute Affiliated to Wenzhou Medical University, Wenzhou People’s Hospital, Wenzhou 325000, People’s Republic of China; 3Department of Reproduction and Genetics, The Wenzhou Third Clinical Institute Affiliated to Wenzhou Medical University, Wenzhou People’s Hospital, Wenzhou 325000, People’s Republic of China; 4Department of Dermatology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, People’s Republic of ChinaCorrespondence: Mingfen LvDepartment of Dermatology, The First Affiliated Hospital of Wenzhou Medical University, Ouhai District, Wenzhou 325000, People’s Republic of ChinaEmail mingfenlv@sina.comBackground: Melanoma is a very malignant skin cancer with high mortality and unsatisfactory prognosis. Many long noncoding RNAs (lncRNAs) have been reported to be aberrantly expressed in melanoma. How lncRNA regulates melanoma progression is poorly defined. LncRNA CAR10 has been shown to regulate the progression of several cancers and its role in melanoma remains unclear. This study aims to determine the role and mechanism of lncRNA CAR10 in the regulation of melanoma progression.Methods: qRT-PCR was utilized to analyze CAR10 in melanoma human tissues and cell lines while Kaplan–Meier curve was used to examine the survival rate. CCK8 assay and EdU assay were used to assess cell proliferation when Transwell assay was conducted to determine migration and invasion. And tumor xenograft assay was performed to evaluate tumor growth in vivo. Additionally, luciferase assay and RNA pulldown assay were performed to analyze the interactions among CAR10, miR-125b-5p and RAB3D.Results: LncRNA CAR10 was upregulated in melanoma tissues and cell lines. Upregulation of CAR10 predicted a poor prognosis in patients with melanoma. CAR10 knockdown suppressed proliferation, migration and invasion of melanoma cells in vitro. CAR10 silencing attenuated tumor growth in vivo. CAR10 inhibited miR-125b-5p activity to upregulate RAB3D expression. And miR-125b-5p/RAB3D signaling is crucial for CAR10-dependent melanoma progression.Conclusion: Our work suggests that lncRNA CAR10 promotes melanoma growth and metastasis through modulating miR-125b-5p/RAB3D axis.Keywords: melanoma, CAR10, progression, miR-125b-5p, RAB3D
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