Related Experiment Video
Updated: Jul 24, 2025
Partial Bile Duct Ligation in the Mouse: A Controlled Model of Localized Obstructive Cholestasis
Published on: March 28, 2018
Alcoholic Setdb1 suppression promotes hepatosteatosis in mice by strengthening Plin2
Yi Zhang1, Yanhui Li2, Yang Liu3
1College of Medical Laboratory Science and Technology, Harbin Medical University-Daqing Campus, Daqing, China; Departments of Laboratory Diagnosis, The Fifth Affiliated Hospital of Harbin Medical University, Daqing, China.
Background And Aims:
Hepatosteatosis is one of the early features of alcoholic liver disease (ALD) and pharmaceutical or genetic interfering of the development of hepatosteatosis will efficiently alleviate the progression of ALD. Currently, the role of histone methyltransferase Setdb1 in ALD is not yet well understood.
Method:
Lieber-De Carli diet mice model and NIAAA mice model were constructed to confirm the expression of Setdb1. The hepatocyte-specific Setdb1-knockout (Setdb1-HKO) mice was established to determine the effects of Setdb1 in vivo. Adenovirus-Setdb1 were produced to rescue the hepatic steatosis in both Setdb1-HKO and Lieber-De Carli mice. The enrichment of H3k9me3 in the upstream sequence of Plin2 and the chaperone-mediated autophagy (CMA) of Plin2 were identified by ChIP and co-IP. Dual-luciferase reporter assay was used to detect the interaction of Setdb1 3'UTR and miR216b-5p in AML12 or HEK 293 T cells.
Results:
We found that Setdb1 was downregulated in the liver of alcohol-fed mice. Setdb1 knockdown promoted lipid accumulation in AML12 hepatocytes. Meanwhile, hepatocyte-specific Setdb1-knockout (Setdb1-HKO) mice exhibited significant lipid accumulation in the liver. Overexpression of Setdb1 was performed with an adenoviral vector through tail vein injection, which ameliorated hepatosteatosis in both Setdb1-HKO and alcoholic diet-fed mice. Mechanistically, downregulated Setdb1 promoted the mRNA expression of Plin2 by desuppressing H3K9me3-mediated chromatin silencing in its upstream sequence. Pin2 acts as a critical membrane surface-associated protein to maintain lipid droplet stability and inhibit lipase degradation. The downregulation of Setdb1 also maintained the stability of Plin2 protein through inhibiting Plin2-recruited chaperone-mediated autophagy (CMA). To explore the reasons for Setdb1 suppression in ALD, we found that upregulated miR-216b-5p bound to the 3'UTR of Setdb1 mRNA, disturbed its mRNA stability, and eventually aggravated hepatic steatosis.
Conclusions:
Setdb1 suppression plays an important role in the progression of alcoholic hepatosteatosis via elevating the expression of Plin2 mRNA and maintaining the stability of Plin2 protein. Targeting hepatic Setdb1 might be a promising diagnostic or therapeutic strategy for ALD.
Insights
Histone methyltransferase Setdb1 (suppression) promotes alcoholic liver disease (ALD) by increasing lipid accumulation via Plin2. Restoring Setdb1 levels may offer a therapeutic strategy for ALD.
Area of Science:
- Hepatology
- Molecular Biology
- Epigenetics
Background:
- Hepatosteatosis is an early indicator of alcoholic liver disease (ALD).
- Understanding the role of histone methyltransferase Setdb1 in ALD is crucial for developing effective treatments.
- Targeting hepatosteatosis can alleviate ALD progression.
Purpose of the Study:
- To investigate the role of histone methyltransferase Setdb1 in the development of alcoholic hepatosteatosis.
- To elucidate the molecular mechanisms by which Setdb1 influences lipid accumulation in the liver.
- To explore Setdb1 as a potential therapeutic target for ALD.
Main Methods:
- Established mouse models (Lieber-De Carli, NIAAA) and hepatocyte-specific Setdb1-knockout (Setdb1-HKO) mice.
- Utilized adenoviral vectors for Setdb1 overexpression to rescue hepatic steatosis.
- Investigated H3K9me3 enrichment, chaperone-mediated autophagy (CMA) of Plin2, and Setdb1-miR216b-5p interactions using ChIP, co-IP, and dual-luciferase reporter assays.
Main Results:
- Setdb1 expression was downregulated in alcohol-fed mice, correlating with increased hepatic lipid accumulation.
- Setdb1 knockdown and knockout exacerbated hepatosteatosis, while Setdb1 overexpression ameliorated it.
- Setdb1 suppression increased Plin2 mRNA and protein levels by reducing H3K9me3-mediated silencing and inhibiting Plin2-recruited CMA.
- Upregulated miR-216b-5p was identified as a key factor suppressing Setdb1 in ALD.
Conclusions:
- Setdb1 suppression is a critical driver of alcoholic hepatosteatosis progression.
- Setdb1 regulates lipid accumulation by modulating Plin2 expression and stability.
- Targeting hepatic Setdb1 presents a promising diagnostic and therapeutic avenue for ALD.
