Abstract
Non-alcoholic fatty liver disease (NAFLD) is rapidly being recognized as the leading cause of chronic liver disease worldwide. Men1, encoding protein of menin, is a key causative gene of multiple endocrine neoplasia type 1 syndrome including pancreatic tumor. It is known that insulin that secretes by endocrine tissue pancreatic islets plays a critical role in hepatic metabolism. Mouse model of hemizygous deletion of Men1 was shown to have severe hepatic metabolism disorders. However, the molecular function of menin on lipid deposition in hepatocytes needs to be further studied. Transcriptome sequencing does show that expression suppression of Men1 in mouse hepatocytes widely affect signaling pathways involved in hepatic metabolism, such as fatty acid metabolism, insulin response, glucose metabolism and inflammation. Further molecular studies indicates that menin overexpression inhibits expressions of the fat synthesis genes Srebp-1c, Fas, and Acc1, the fat differentiation genes Pparγ1 and Pparγ2, and the fat transport gene Cd36, thereby inhibiting the fat accumulation in hepatocytes. The biological process of menin regulating hepatic lipid metabolism was accomplished by interacting with the transcription factor FoxO1, which is also found to be critical for lipid metabolism. Moreover, menin responds to insulin in hepatocytes and mediates its regulatory effect on hepatic metabolism. Our findings suggest that menin is a crucial mediation factor in regulating the hepatic fat deposition, suggesting it could be a potential important therapeutic target for NAFLD.
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Data availability
The data used to support the findings of this study are available from the corresponding author upon request.
Abbreviations
- Acc1:
-
Acetyl CoA carboxylase
- Akt, also named as PKB:
-
Protein kinase B
- Cd36:
-
A fatty acid transporter
- FoxO1:
-
Forkhead box O1
- ChIP:
-
Chromatin immunoprecipitation
- DEGs:
-
Differentially expressed genes
- Fas:
-
Fatty acid synthase
- Gk:
-
Glucokinase
- GO:
-
Gene ontology
- KEGG:
-
Kyoto encyclopedia of genes and genomes
- MEN1:
-
Multiple endocrine neoplasia type 1
- NAFLD:
-
Nonalcoholic fatty liver disease
- OA:
-
Oleic acid
- Pparγ:
-
Peroxisome proliferator-activated receptor gamma
- qRT-PCR:
-
Quantitative reverse transcription polymerase chain reaction
- SIRT1:
-
Sirtuin 1
- Srebp-1c:
-
Sterol regulatory element-binding protein 1C
- T2DM:
-
Type 2 diabetes mellitus
- TG:
-
Triglyceride
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Acknowledgements
We are grateful to Prof. Shaorong Gao in Tongji University for his helpful discussions and excellent suggestions for the project and manuscript. We also thank all present and past members of our laboratory who have contributed comments and ideas.
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This work was financially supported by the Natural Science Foundation of Shandong (ZR2020MC166; ZR2013CM013), the National Key Research and Development Program of China (2021YFD1200900), the National Natural Science Foundation of China (31402054), the Key Project of Agricultural Fine Breeding of Shandong Province (2019LZGC011, 2016LZGC030).
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Shi KR, Wang SX; Liu TJ and Du HX participated in the execution of all experiments, analyzed the data, and drafted the manuscript; Liu TJ, Sun LL, Xu ZJ, and Li RR participated in construction of the expression plasmids, data analysis and discussion; Yu Y and Mao YJ participated in experimental design, coordinated the experiments. All authors reviewed and approved the final manuscript.
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Wang, S., Liu, T., Sun, L. et al. Menin regulates lipid deposition in mouse hepatocytes via interacting with transcription factor FoxO1. Mol Cell Biochem 477, 1555–1568 (2022). https://doi.org/10.1007/s11010-022-04392-6
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DOI: https://doi.org/10.1007/s11010-022-04392-6