Zhang L, Lu XF, Ji HJ, Zhou YJ, Wu ZR, Li L, Chen F, Bu H, Shi YJ. Ablation of histone deacetylase 3 in hepatocytes inhibits liver regeneration and induces apoptosis in mice.
Shijie Huaren Xiaohua Zazhi 2015;
23:5597-5605. [DOI:
10.11569/wcjd.v23.i35.5597]
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Abstract
AIM: To investigate the role of histone deacetylase 3 (HDAC3) in liver regeneration followed by partial hepatectomy (PH).
METHODS: HDAC3 floxed mice were crossed with a tamoxifen-inducible ALB-CREERT allele to generate inducible tamoxifen-dependent liver-specific HDAC3 knock-out mice (ALB-CREERTHDAC3flox/flox mice). The efficiency of HDAC3 recombination and histological changes after tamoxifen treatment in adult ALB-CREERTHDAC3flox/flox mice were determined. Liver regeneration was induced by a 70% PH and mice were sacrificed at various time points after surgery. 5-Bromo-2-deoxyuridine (BrdU) incorporation and Ki67 immunohistochemistry were performed to observe the mitotic progression. The expression of mitotic markers cyclins and cyclin-dependent-kinases (CDKs) was detected by Western blot. Apoptosis of hepatocytes was analyzed by terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling (TUNEL) assay and immunoblotting of cleaved Caspase3.
RESULTS: HDAC3 in tamoxifen-treated ALB-CREERTHDAC3flox/flox mice (HDAC3△ mice) was efficiently deleted. HDAC3△ mice did not show any apparent changes in liver histology or metabolism compared to control mice without TAM injeciton. The restoration of remnant liver mass was significantly reduced in HDAC3△ mice. Dramatic lower hepatocyte mitotic figures in HDAC3△ mice determined were observed at 36-48 h after PH as indicated by BrdU and Ki67 immunohistochemistry staining. Western blot analysis confirmed that deletion of HDAC3 resulted in poor expression of cyclin B and cyclin D, whereas CDK2 and CDK4 were kept similar both in control and HDAC3△ mice at 36 h and 48 h after PH. In addition, noticeably increased apoptotic hepatocytes were found in HDAC3△ livers.
CONCLUSION: HDAC3 plays crucial roles in the regulation of liver regeneration, and loss of HDAC3 inhibits liver regeneration and induces apoptosis.
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