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Published on: August 7, 2012
Key m6A regulators mediated methylation modification pattern and immune infiltration characterization in hepatic
Yixi Zhang1, Can Qi2, Yiwen Guo3
1Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, NO. 95 Yongan Road, Beijing, 100051, China.
Background:
N6-methyladenosine (m6A) mRNA modification plays a critical role in various human biological processes. However, there has been no study reported to elucidate its role in hepatic ischemia-reperfusion injury (IRI). This study was aimed to explore the expression pattern together with the potential functions of m6A regulators in hepatic IRI.
Methods:
The gene expression data (GSE23649) of m6A regulators in human liver tissue samples before cold perfusion and within 2 h after portal vein perfusion from Gene Expression Omnibus database was analyzed. The candidate m6A regulators were screened using random forest (RF) model to predict the risk of hepatic IRI. The evaluation of infiltrating abundance of 23 immune cells was performed using single sample gene set enrichment analysis. Besides, quantitative real time polymerase chain reaction (qRT-PCR) assay was carried out to validate the expression of key m6A regulators in mouse hepatic IRI model.
Results:
The expressions of WTAP, CBLL1, RBM15, and YTHDC1 were found to be increased in liver tissues 2 h after portal vein perfusion; in contrast, the expressions of LRPPRC, FTO, METTL3, and ALKBH5 were decreased. Based on RF model, we identified eight m6A methylation regulators for the prediction of the risk of hepatic IRI. Besides, a nomogram was built to predict the probability of hepatic IRI. In addition, the levels of WTAP, ALKBH5, CBLL1, FTO, RBM15B, LRPPRC and YTHDC1 were correlated with the immune infiltration of activated CD4 T cell, activated dendritic cell (DC), immature DC, mast cell, neutrophil, plasmacytoid DC, T helper (Th) cell (type 1, 2, and 17), gamma delta T cell, T follicular helper (Tfh) cell, myeloid-derived suppressor cell (MDSC), macrophage, natural killer cell, and regulatory Th cell. Among mouse hepatic IRI model, the mRNA level of CBLL1 and YTHDC1 was increased with statistical significance; however, the mRNA level of FTO and METTL3 was decreased among post-reperfusion liver samples compared with those in pre-reperfusion samples with statistical significance.
Conclusions:
The m6A regulators exerted a pivotal impact on hepatic IRI. The m6A patterns that found in this study might provide novel targets and strategies for the alleviation/treatment of hepatic IRI in the future.
Insights
N6-methyladenosine (m6A) mRNA regulators impact hepatic ischemia-reperfusion injury (IRI). This study identified key m6A regulators and their correlation with immune cells, offering potential therapeutic targets for hepatic IRI.
Area of Science:
- Epigenetics
- Molecular Biology
- Immunology
Background:
- N6-methyladenosine (m6A) mRNA modification is crucial in biological processes.
- Its role in hepatic ischemia-reperfusion injury (IRI) remains unexplored.
- This study investigates m6A regulators in hepatic IRI.
Purpose of the Study:
- To explore the expression patterns of m6A regulators in hepatic IRI.
- To identify potential functions of m6A regulators in hepatic IRI.
- To establish predictive models for hepatic IRI risk.
Main Methods:
- Analysis of gene expression data (GSE23649) of m6A regulators in human liver tissues.
- Screening of candidate m6A regulators using random forest (RF) model.
- Validation in a mouse hepatic IRI model using qRT-PCR and immune cell infiltration analysis.
Main Results:
- Differential expression of m6A regulators (e.g., WTAP, CBLL1, FTO, METTL3) observed in hepatic IRI.
- Eight m6A regulators identified for hepatic IRI risk prediction via RF model.
- Correlation between m6A regulators and infiltration of various immune cells (e.g., T cells, myeloid-derived suppressor cells, macrophages).
Conclusions:
- m6A regulators significantly influence hepatic IRI.
- Identified m6A patterns may offer novel therapeutic targets for hepatic IRI.
- Further research into m6A modification could lead to new treatment strategies for hepatic IRI.
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