eISSN: 1644-4124
ISSN: 1426-3912
Central European Journal of Immunology
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4/2021
vol. 46
 
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abstract:
Experimental immunology

Gastric cancer mesenchymal stem cells inhibit natural killer cell function by up-regulating FBP1

Fengfeng Han
1
,
Shuwei Guo
1
,
Chao Huang
1
,
Linjing Cui
1
,
Yuanyuan Zhao
1
,
Jie Ma
1
,
Miaolin Zhu
2
,
Zhihong Chen
3
,
Mei Wang
1
,
Bo Shen
2
,
Wei Zhu
1

1.
School of Medicine, Jiangsu University, Zhenjiang, China
2.
Department of Oncology, The Affiliated Cancer Hospital of Nanjing Medical, China
3.
Department of Gastrointestinal Surgery, Affiliated People’s Hospital of Jiangsu University, Zhenjiang, China
(Cent Eur J Immunol 2021; 46 (4): 427-437)
Online publish date: 2021/12/23
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Introduction
The dysfunction of natural killer (NK) cells has been widely reported in malignancies, including in solid tumours. Gastric cancer mesenchymal stem cells (GCMSCs) are one of the vital elements of stromal cells in the tumour environment (TME) which possess immunosuppressive activity. This study aimed to determine whether GCMSCs are involved in the inhibition of NK cell immune function and explore its underlying mechanism.

Material and methods
CD107a and perforin expression of GCMSCs conditioned medium (GCMSCs-CM)-primed NK cells were detected by flow cytometry. To determine NK cell cytotoxicity, the CytoTox96 Non-Radioactive Cytotoxicity Assay kit was used. Glucose uptake and lactate production assay were performed to evaluate the metabolism state of NK cells treated with GCMSCs-CM. The expression of FBP1 in NK cells was analysed by immunoblotting.

Results
GCMSCs inhibited the degranulation capacity, perforin production and cytotoxicity of NK cells. GCMSCs-CM restrained NK cell glucose uptake and lactate production, thus weakening their glycolytic metabolism. FBP1 expression of NK cells was upregulated in the presence of GCMSCs-CM. Using FBP1 inhibitor could reverse the dysfunctional state of NK cells.

Conclusions
This study indicated that GCMSCs could exert immunosuppressive effects on NK cells by up-regulating FBP1 expression, opening up new avenues for NK cell-based GC immunotherapy.

keywords:

natural killer cells, mesenchymal stem cells, FBP1, tumour environment

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