Abstract
Background
Epigenetic alteration plays an essential role in the occurrence and development of extranodal natural killer/T cell lymphoma (ENKTL). Histone methyltransferase (HMT) KMT2D is an epigenetic regulator that plays different roles in different tumors, but its role and mechanism in ENKTL are still unclear.
Methods
We performed immunohistochemical staining of 112 ENKTL formalin-fixed paraffin-embedded (FFPE) samples. Then, we constructed KMT2D knockdown cell lines and conducted research on cell biological behavior. Finally, to further investigate KMT2D-mediated downstream genes, ChIP-seq and ChIP -qPCR was performed.
Results
The low expression of KMT2D was related to a decreased abundance in histone H3 lysine 4 mono- and trimethylation (H3K4me1/3). In KMT2D knockdown YT and NK-YS cells, cell proliferation was faster (P < 0.05), apoptosis was decreased (P < 0.05), the abundance of S phase cells was increased (P < 0.05), and the level of H3K4me1 was decreased. Notably, ChIP-seq revealed two crucial genes and pathways downregulated by KMT2D.
Conclusions
KMT2D is a tumor suppressor gene that mediates H3K4me1 and influences ENKTL proliferation and apoptosis by regulating the cell cycle. Moreover, in ENKTL, serum- and glucocorticoid-inducible kinase-1 (SGK1) and suppressor of cytokine signaling-1 (SOCS1) are downstream genes of KMT2D.
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Data availability
The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to their containing information that could compromise the privacy of research participants.
Abbreviations
- ENKTL:
-
extranodal natural killer/T cell lymphoma
- HMT:
-
histone methyltransferase
- FFPE:
-
formalin-fixed paraffin-embedded
- H3K4me1/2/3:
-
monomethylation, dimethylation or trimethylation of histone 3 lysine 4
- SGK1 :
-
serum- and glucocorticoid-inducible kinase-1
- SOCS1 :
-
suppressor of cytokine signaling-1
- EBV:
-
Epstein–Barr virus
- WHO:
-
World Health Organization
- FBS:
-
foetal bovine serum
- MOI:
-
multiplicity of infection
- NC:
-
negative control
- DAB:
-
diaminobenzidine
- BCA:
-
bicinchoninic acid
- PVDF:
-
polyvinylidene difluoride
- ECL:
-
electrochemiluminescence
- CCK8:
-
Cell Counting Kit-8
- KEGG:
-
Kyoto Encyclopedia of Genes and Genomes
- χ2 :
-
chi-square
- OS:
-
overall survival
- SEM:
-
standard error of the mean
- PTCL-NOS:
-
peripheral T cell lymphoma, not otherwise specified
- GC:
-
germinal center
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Funding
This study was financially supported by the national natural science foundation of China (81900197, 81272626) and the Science and Technology Program of Sichuan Province (2020YJ0104).
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YHZ and QT designed the study, analyzed and interpreted the data; YHZ and LMG were major contributors to writing the manuscript. WYZ and SZ revised the manuscript. WPL and LMG were responsible for the acquisition of data and institutional review board application, and gave final approval for the version to be published. All authors read and approved the final manuscript.
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Zhang, YH., Tao, Q., Zhang, WY. et al. Histone methyltransferase KMT2D inhibits ENKTL carcinogenesis by epigenetically activating SGK1 and SOCS1. Genes Genom 46, 203–212 (2024). https://doi.org/10.1007/s13258-023-01434-1
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DOI: https://doi.org/10.1007/s13258-023-01434-1