Title:Obese Mouse Fat Cell-derived Extracellular Vesicles Transport
miR-99a-5p to Mitigate the Proliferation and Migration of Non-small Cell
Lung Cancer Cells
Volume: 27
Issue: 2
Author(s): Shengping Zhai, Xiaoping Li and Tiantian Lin*
Affiliation:
- Respiratory Intensive Care Unit, Yantai Yuhuangding Hospital Affiliated to Qingdao University,
Yantai, 264000, China
Keywords:
Non-small cell lung cancer, obesity, fat cells, extracellular vesicles, miR-99a-5p, HS3ST3B1.
Abstract:
Objective: Fat cells-derived extracellular vesicles (FC-EVs) play a role in regulating the
tumor microenvironment in cancers by transporting RNAs. MicroRNAs (miRNAs) are vital regulators
of cancer development. This study was conducted to explore the role of FC-EVs in the proliferation
and migration of non-small cell lung cancer (NSCLC) cells, providing targets for NSCLC
treatment.
Methods: The obese mouse model was established via high‐fat diet (HFD), followed by separation
and characterization of FC-EVs (HFD-EVs). The levels of miR-99a-5p, precursor-miR-99a-5p,
and heparan sulfate-glucosamine 3-sulfotransferase 3B1 (HS3ST3B1) were measured by RT-qPCR
or Western blot assay. Cell proliferation and migration were evaluated by 3-(4, 5-dimethylthiazol-
2-yl)-2, 5-diphenyltetrazolium bromide and wound healing assays. The expression of Cy3-labeled
miR-99a-5p in A549 cells (one NSCLC cell line) was observed via confocal microscopy. The
binding of miR-99a-5p to HS3ST3B1 was analyzed by the dual luciferase assay. Rescue experiments
were performed to confirm the role of HS3ST3B1 in NSCLC cells.
Results: miR-99a-5p was upregulated in adipose tissues, FCs, and HFD-EVs. HFD-EVs mitigated
the proliferation and migration of NSCLC cells. HFD-EVs transported miR-99a-5p into A549
cells, which upregulated miR-99a-5p expression and inhibited HS3ST3B1 expression in A549
cells. HS3ST3B1 overexpression reversed the inhibition of HFD-EVs on the proliferation and migration
of NSCLC cells.
Conclusion: HFD-EVs transported miR-99a-5p into NSCLC cells and inhibited HS3ST3B1,
thereby inhibiting proliferation and migration of NSCLC cells.