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Mettl14 mutation restrains liver regeneration by attenuating mitogens derived from non-parenchymal liver cells
Insook Yang1 (Graduate student), Seung Yeon Oh2 (Research worker), Suin Jang2 (Research worker), Il Yong Kim1,2 (research worker), You Me Sung2 (research worker), Je Kyung Seong1,2,3,* (Proffessor)
1Laboratory of Developmental Biology and Genomics, College of Veterinary Medicine, Seoul National University,
2Korea Mouse Phenotyping Center, Seoul National University,
3Interdisciplinary Program for Bioinformatics, and BIO-MAX Institute, Seoul National University
Liver regeneration is a well-known systemic homeostatic phenomenon. Recently, the N6-methyladenosine (m6A) modification pathway has been associated with liver regeneration and hepatocellular carcinoma. m6A methyltransferases, such as methyltransferase 3 (METTL3) and methyltransferase 14 (METTL14), are associated with the hepatocyte-specific-regenerative pathway. To illustrate the role of METTL14, secreted from non-parenchymal liver cells, in the initiation phase of liver regeneration, we performed 70% partial hepatectomy (PH) in Mettl14 heterozygous (HET) and wild-type (WT) mice. Next, we analyzed the ratio of liver weight to body weight and the expression of mitogenic stimulators derived from non-parenchymal liver cells. We also evaluated the expression of cell cycle-related genes and the hepatocyte proliferation rate by MKI67-immunostaining. During regeneration after PH, the weight ratio was lower in Mettl14 HET mice compared to WT mice. The expression levels of hepatocyte growth factor (HGF) and tumor necrosis factor (TNF)-メ, mitogens derived from non-parenchymal liver cells that stimulate the cell cycle, as well as the expression of cyclin B1 and D1, which regulate the cell cycle, and the number of MKI67-positive cells, which indicate proliferative hepatocyte in the late G1-M phase, were significantly reduced in Mettl14 HET mice 72h after PH. Our findings demonstrate that global Mettl14 mutation may interrupt the homeostasis of liver regeneration after an acute injury like PH by restraining certain mitogens, such as HGF and TNF-メ, derived from sinusoidal endothelial cells, stellate cells, and Kupffer cells. These results provide new insights into the role of Mettl14 in the clinical translation of liver disease.
Abstract, Accepted Manuscript(in press) [Submitted on September 13, 2022, Accepted on October 24, 2022]
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