Title:miRNA-363-3p Hinders Proliferation, Migration, Invasion and Autophagy of
Thyroid Cancer Cells by Controlling SYT1 Transcription to affect NF-κB
Volume: 24
Issue: 1
Author(s): Jizong Zhang, Guanghui Ren, Tao Huang, Yiming Sang, Yan Zhong*Yongxiang Yi*
Affiliation:
- Department of General Surgery, The Second Hospital of Nanjing, Nanjing University of Chinese Medicine, Nanjing City, Jiangsu Province, 210009, China
- Department of General Surgery, The Second Hospital of Nanjing, Nanjing University of Chinese Medicine, Nanjing City, Jiangsu Province, 210009, China
Keywords:
Thyroid cancer, miRNA-363-3p, SYT1; malignant progression, cancer cells, NF-κB pathway.
Abstract:
Background: Thyroid cancer (TC) is a frequent endocrine malignant tumor with various
pathologic types. miRNA-363-3p plays a pivotal part in the occurrence, development, prognosis,
and treatment of cancer.
Objective: To explore the mechanism of miRNA-363-3p in TC and provide a new idea for targeted
therapy of TC.
Methods: Differential miRNAs and downstream target mRNAs in TC tissues were predicted with
bioinformatics analysis. Expression levels of miRNA-363-3p and Synaptotagmin I (SYT1) in TC
cells were ascertained by qRT-PCR. Cell migration, invasion, and proliferation were detected by
wound healing assay, transwell assay, colony formation assay, CCK-8, and BrdU fluorescence experiment,
respectively. Flow cytometry was utilized to detect the levels of apoptosis and necrosis.
Immunofluorescence assay was used for detecting autophagosome formation in cells, and the expression
levels of autophagy-related proteins, as well as NF-κB related proteins, were measured by
western blot. Dual-luciferase reporter gene assay was applied for detecting the interaction between
miRNA-363-3p and SYT1.
Results: miRNA-363-3p was prominently down-regulated in TC cells. miRNA-363-3p overexpression
suppressed migration, invasion, and proliferation, promoting apoptosis and necrosis of TC
cells. As the downstream target of miRNA-363-3p, SYT1 was up-regulated in TC cells. SYT1
overexpression reversed the inhibition of TC cell proliferation, invasion, migration, and autophagy
mediated by miRNA-363-3p overexpression. In addition, miRNA-363-3p overexpression inhibited
the activation of the NF-κB pathway in cells, while further overexpression of SYT1 weakened the
inhibition of miRNA-363-3p overexpression on the NF-κB pathway.
Conclusion: miRNA-363-3p affected the NF-κB signaling pathway by down-regulating SYT1 expression
to inhibit the malignant progression of TC cells, providing theoretical support for the treatment
of TC.