Related Experiment Video
Updated: Jun 25, 2025
Measurement of Natural Killer Cell-Mediated Cytotoxicity and Migration in the Context of Hepatic Tumor Cells
Published on: February 22, 2020
Exosomal transfer of HCC-derived miR-17-5p downregulates NK cell function by targeting RUNX1-NKG2D axis
Zhifeng Zhou1, Tianchuan Li2, Jieyu Li1
1Laboratory of Immuno-Oncology, Clinical Oncology School of Fujian Medical University, Fujian Cancer Hospital, Fuzhou 350014, China; School of Basic Medical Sciences, Fujian Medical University, Fuzhu, Fujian, China.
Objective:
Natural killer (NK) cells are an integral part of the staunch defense line against malignant tumors within the tumor microenvironment. Existing research indicates that miRNAs can influence the development of NK cells by negatively modulating gene expression. In this study, we aim to explore how the miR-17-5p in Hepatocellular Carcinoma (HCC) exosomes regulates the killing function of NK cells towards HCC cells through the transcription factor RNX1.
Methods:
The exosomes were isolated from HCC tissues and cell lines, followed by a second generation sequencing to compare differential miRNAs. Verification was performed using qRT-PCR and Western blot methods. The mutual interactions between miR-17-5p and RUNX1, as well as between RUNX1 and NKG2D, were authenticated using techniques like luciferase reporter gene assays, Western blotting, and Chromatin Immunoprecipitation (ChIP). The cytotoxic activity of NK cells towards HCC cells in vitro was measured using methods such as RTCA and ELISPOT. The zebrafish xenotransplantation was utilized to assess the in vivo killing capacity of NK cells against HCC cells.
Results:
The level of miR-17-5p in exosomes from HCC tissue increased compared to adjacent tissues. We verified that RUNX1 was a target of miR-17-5p and that RUNX1 enhances the transcription of NKG2D. MiR-17-5p was found to downregulate the expression of RUNX1 and NKG2D, subsequently reducing the in vitro and in vivo cytotoxic capabilities of NK cells against HCC cells.
Conclusions:
The miR-17-5p found within HCC exosomes can target RUNX1, subsequently attenuating the cytotoxic activity of NK cells.
Insights
Hepatocellular Carcinoma (HCC) exosomes contain miR-17-5p, which targets RUNX1. This interaction suppresses NK cell activity against HCC, hindering anti-tumor immunity.
Area of Science:
- Immunology
- Molecular Biology
- Oncology
Background:
- Natural killer (NK) cells are crucial for anti-tumor immunity within the tumor microenvironment.
- MicroRNAs (miRNAs) regulate gene expression and influence NK cell development and function.
- Hepatocellular Carcinoma (HCC) poses a significant health challenge, necessitating novel therapeutic strategies.
Purpose of the Study:
- To investigate the role of miR-17-5p in HCC exosomes in regulating NK cell cytotoxicity.
- To elucidate the molecular mechanism involving the transcription factor RUNX1 and NKG2D.
Main Methods:
- Exosomes were isolated from HCC tissues and cell lines.
- miRNA profiling, qRT-PCR, and Western blotting were used for verification.
- Luciferase reporter assays, ChIP, and in vitro/in vivo assays assessed molecular interactions and cellular functions.
Main Results:
- miR-17-5p levels were elevated in HCC exosomes.
- miR-17-5p directly targets RUNX1, which positively regulates NKG2D transcription.
- Downregulation of RUNX1 and NKG2D by miR-17-5p impaired NK cell killing of HCC cells.
Conclusions:
- miR-17-5p within HCC exosomes suppresses NK cell-mediated anti-tumor activity by targeting RUNX1.
- This mechanism highlights a novel pathway for immune evasion in HCC.
- Targeting miR-17-5p or its downstream effectors may represent a therapeutic approach for HCC.
More Related Videos
11:08Advances in Human Induced Pluripotent Stem Cell-Derived Chimeric Antigen Receptor-Expressing Natural Killer Cells
Published on: February 14, 2025
08:50In Vitro Cultivation Techniques for Modeling Liver Organogenesis, Building Assembloids, and Designing Synthetic Tissues using Human Cell Lines
Published on: April 18, 2025
Related Concept Videos
01:22MicroRNAs
01:27Cytotoxic T Cells-mediated Immune Response
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...