Abstract
Objective
Previous studies have indicated that neurotransmitters play important roles in the occurrence and development of gastric cancer. MAOA is an important catecholamine neurotransmitter-degrading enzyme involved in the degradation of norepinephrine, epinephrine and serotonin. To find a potential therapeutic target for the treatment of gastric cancer, the biological functions of MAOA and the underlying mechanism in gastric cancer need to be explored.
Methods
The Cancer Genome Atlas (TCGA), Gene Expression Omnibus (GEO) datasets, Kaplan‒Meier (KM) plotter were used to identify the differentially expressed genes, which mainly involved the degradation and synthesis enzymes of neurotransmitters in gastric cancer. We also investigated the expression pattern of MAOA in human and mouse tissues and cell lines by immunohistochemistry and Western blotting analysis. Western blotting, quantitative real-time PCR, enzyme-linked immunosorbent assay (ELISA) and a Seahorse experiment were used to identify the molecular mechanism of cancer cell glycolysis. MAOA expression and patient survival were analysed in the Ren Ji cohort, and univariate and multivariate analyses were performed based on the clinicopathological characteristics of the above samples.
Results
MAOA expression was significantly downregulated in gastric cancer tissue and associated with poor patient prognosis. Moreover, the expression level of MAOA in gastric cancer tissue had a close negative correlation with the SUXmax value of PET-CT in patients. MAOA suppressed tumour growth and glycolysis and promoted cancer cell apoptosis. We also reported that MAOA can interact with NDRG1 and regulate glycolysis through suppression of the PI3K/Akt/mTOR pathway. MAOA expression may serve as an independent prognostic factor in gastric cancer patients.
Conclusions
MAOA attenuated glycolysis and inhibited the progression of gastric cancer through the PI3K/Akt/mTOR pathway. Loss of function or downregulation of MAOA can facilitate gastric cancer progression. Overexpression of MAOA and inhibition of the PI3K/Akt/mTOR pathway may provide a potential method for gastric cancer treatment in clinical therapeutic regimens.
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Data availability
The data and materials supporting the conclusions of this study are included within the article and its additional files. The public database for this study can be accessed on the following websites: TCGA database (https://cancergenome.nih.gov/), Gene Expression Omnibus (https://www.ncbi.nlm.nih.gov/pubmed) and Kaplan Meier‑Plotter website (http://kmplot.com/analysis/index.php?p=service&cancer=gastric).
Abbreviations
- TCGA :
-
The Cancer Genome Atlas
- GEO :
-
Gene Expression Omnibus
- KM :
-
Kaplan‒Meier
- ELISA :
-
Enzyme-linked immunosorbent assay
- NE :
-
Norepinephrine
- E :
-
Epinephrine
- MAOA :
-
Monoamine oxidase A
- DBH :
-
Dopamine β-hydroxylase
- MAOB :
-
Monoamine oxidase B
- COMT :
-
Catechol-O-methyltransferase
- IHC :
-
Immunohistochemistry
- RT‒qPCR :
-
Reverse transcription-quantitative polymerase chain reaction
- TMA :
-
Tissue microarray
- TNM :
-
Tumor‑Node‑Metastasis
- FFPE :
-
Formalin‑fixed paraffin‑embedded
- OS :
-
Overall survival
- PCNA :
-
Proliferating cell nuclear antigen
- ECAR :
-
Extracellular acidification rate
- OCR :
-
Oxygen consumption rate
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Acknowledgements
We thank Dr. Xue-Li Zhang, Dr. Dong-Xue Li, Dr. Lei Zhu, Dr. Lin-Li Yao, Dr. Yan-Li Zhang, Dr. Hui-Zhen Nie, Dr. Xiao-Mei Yang for assistance with our experiments. We also would like to thank members of the Department of Pathology, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University (Shanghai, China) for providing assistance.
Funding
This work was supported by the National Natural Science Foundation of China (ID 82103348, to Y.-Y. Wang; ID 82073023, 81871923, to J. Li; ID 82002485, to Q. Li; ID 82103357, to L.-P. Hu), the Shanghai Municipal Education Commission—Gaofeng Clinical Medicine Grant Support (ID 20191809, to J. Li), Shanghai Sailing Program (ID 21YF1445200, to L.-P. Hu), Natural Science Foundation of Shanghai (ID 21ZR1461300, to L.-P. Hu).
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Y.-Y.W. and J.L. designed and supervised the overall study, analyzed data, and drafted the manuscript. Y.-Y.W., Y.-Q.Z., J.-X.X. and X.Z. performed immunohistochemical staining of gastric cancer and normal tissues, quantitative realtime PCR and Western blotting. Q.L., L.-P.H., S.-H.J. and S.-Q.Y. technically assisted with experiments and analyzed data. S.-C.W. Collected patient data and handled patient follow-up. J.X., H.C. and E.-H.Z. provided human gastric cancer and normal tissues. J.L. and Y.-Y.W. supervised this study and edited the manuscript.
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Written informed consent was obtained from all enrolled patients prior to their inclusion in the study, and the studies were conducted in accordance with Declaration of Helsinki ethical guidelines. The present study was approved by the Ethics Committee of Renji Hospital, Shanghai Jiao Tong University School of Medicine.
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Wang, YY., Zhou, YQ., Xie, JX. et al. MAOA suppresses the growth of gastric cancer by interacting with NDRG1 and regulating the Warburg effect through the PI3K/AKT/mTOR pathway. Cell Oncol. 46, 1429–1444 (2023). https://doi.org/10.1007/s13402-023-00821-w
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DOI: https://doi.org/10.1007/s13402-023-00821-w