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孔 祥, 张 腾, 张 妍, 高 灵, 汪 文, 汪 梦, 王 国, 吕 坤. [Overexpression of lncRNA HEM2M alleviates liver injury in mice with non-alcoholic fatty liver disease]. NAN FANG YI KE DA XUE XUE BAO = JOURNAL OF SOUTHERN MEDICAL UNIVERSITY 2024; 44:1-8. [PMID: 38293970 PMCID: PMC10878907 DOI: 10.12122/j.issn.1673-4254.2024.01.01] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Indexed: 02/01/2024]
Abstract
OBJECTIVE To explore the effects of long non-coding RNA (lncRNA) HEM2M overexpression on liver injury in mice with non-alcoholic fatty liver disease (NAFLD). METHODS Wild-type C57BL/6 (WT) mice and myeloid cell-specific HEM2M knock-in (MYKI) mice were fed normal (ND) or high-fat diet (HFD) for 12 weeks. After intraperitoneal glucose tolerance and insulin tolerance tests, the mice were euthanized for detection of liver function indicators in the serum and liver tissue. HE staining and F4/80 immunohistochemical staining were used to examine liver pathologies, and the levels of IL-6, IL-1β, and TNF-α in the liver tissues were determined with ELISA. The mRNA expressions of HEM2M and the markers of M1 macrophages (TNF-α, iNOS, and IL-6) and M2 macrophages (Arg-1, YM-1, and IL-10) were detected using qRT-PCR, and the protein expressions of P-AKT, T-AKT, NLRC4, caspase-1 and GSDMD were assayed using immunoblotting. Caspase-1 activity in the liver tissues was determined with colorimetric measurement and immunofluorescence assay. RESULTS Compared with HFD-fed WT mice, MYKI mice with HFD feeding showed milder liver function damage (P < 0.01), alleviated hepatic steatosis, and reduced liver macrophage infiltration, glucose tolerance impairment and insulin resistance (P < 0.01). The levels of IL-6, IL-1β, and TNF-α and mRNA expressions of M1 type macrophage markers were significantly decreased (P < 0.01) and those of M2 type markers increased (P < 0.01) in the liver tissues of HFD-fed MYKI mice, which also showed reduced NLRC4 inflammasome activity, caspase-1 activation, and GSDMD-N protein expression compared with their WT counterparts (P < 0.05). CONCLUSION Overexpression of HEM2M reduces the production of hepatic inflammatory factors, improves insulin resistance and inhibits hepatic NLRC4 inflammasome activation, which leads to reduced hepatic pyroptosis and liver injury in NAFLD mice.
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Affiliation(s)
- 祥 孔
- 皖南医学院非编码RNA基础与临床转化安徽省重点实验室,安徽 芜湖 241001Key Laboratory of Non-coding RNA Transformation Research of Anhui Higher Education Institution, Wannan Medical College, Wuhu 241001, China
- 皖南医学院弋矶山医院中心实验室,安徽 芜湖 241001Central Laboratory, Yijishan Hospital, Wannan Medical College, Wuhu 241001, China
- 皖南医学院弋矶山医院内分泌科,安徽 芜湖 241001Department of Endocrinology, Yijishan Hospital, Wannan Medical College, Wuhu 241001, China
| | - 腾 张
- 皖南医学院非编码RNA基础与临床转化安徽省重点实验室,安徽 芜湖 241001Key Laboratory of Non-coding RNA Transformation Research of Anhui Higher Education Institution, Wannan Medical College, Wuhu 241001, China
- 皖南医学院弋矶山医院消化内科,安徽 芜湖 241001Department of Gastroenterology, Yijishan Hospital, Wannan Medical College, Wuhu 241001, China
| | - 妍 张
- 皖南医学院非编码RNA基础与临床转化安徽省重点实验室,安徽 芜湖 241001Key Laboratory of Non-coding RNA Transformation Research of Anhui Higher Education Institution, Wannan Medical College, Wuhu 241001, China
- 皖南医学院弋矶山医院消化内科,安徽 芜湖 241001Department of Gastroenterology, Yijishan Hospital, Wannan Medical College, Wuhu 241001, China
| | - 灵犀 高
- 皖南医学院非编码RNA基础与临床转化安徽省重点实验室,安徽 芜湖 241001Key Laboratory of Non-coding RNA Transformation Research of Anhui Higher Education Institution, Wannan Medical College, Wuhu 241001, China
- 皖南医学院弋矶山医院消化内科,安徽 芜湖 241001Department of Gastroenterology, Yijishan Hospital, Wannan Medical College, Wuhu 241001, China
| | - 文 汪
- 皖南医学院非编码RNA基础与临床转化安徽省重点实验室,安徽 芜湖 241001Key Laboratory of Non-coding RNA Transformation Research of Anhui Higher Education Institution, Wannan Medical College, Wuhu 241001, China
- 皖南医学院弋矶山医院消化内科,安徽 芜湖 241001Department of Gastroenterology, Yijishan Hospital, Wannan Medical College, Wuhu 241001, China
| | - 梦燕 汪
- 皖南医学院药学院//安徽省多糖药物工程技术研究中心,安徽 芜湖 241002School of Pharmacy, Wannan Medical College, Anhui Provincial Engineering Research Center for Polysaccharide Drugs, Wuhu 241002, China
| | - 国栋 王
- 皖南医学院药学院//安徽省多糖药物工程技术研究中心,安徽 芜湖 241002School of Pharmacy, Wannan Medical College, Anhui Provincial Engineering Research Center for Polysaccharide Drugs, Wuhu 241002, China
| | - 坤 吕
- 皖南医学院非编码RNA基础与临床转化安徽省重点实验室,安徽 芜湖 241001Key Laboratory of Non-coding RNA Transformation Research of Anhui Higher Education Institution, Wannan Medical College, Wuhu 241001, China
- 皖南医学院弋矶山医院中心实验室,安徽 芜湖 241001Central Laboratory, Yijishan Hospital, Wannan Medical College, Wuhu 241001, China
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Guo M, Chen S, Lao J, Liang J, Chen H, Tong J, Huang Y, Jia D, Li Q. 3BDO Alleviates Seizures and Improves Cognitive Function by Regulating Autophagy in Pentylenetetrazol (PTZ)-Kindled Epileptic Mice Model. Neurochem Res 2022; 47:3777-3791. [PMID: 36243819 DOI: 10.1007/s11064-022-03778-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 09/24/2022] [Accepted: 09/29/2022] [Indexed: 12/13/2022]
Abstract
3-benzyl-5-((2-nitrophenoxy) methyl)-dihydrofuran-2(3 H)-one (3BDO) is a mTOR agonist that inhibits autophagy. The main purpose of this study is to investigate the effects of 3BDO on seizure and cognitive function by autophagy regulation in pentylenetetrazol (PTZ)-kindled epileptic mice model. The PTZ-kindled epileptic mice model was used in study. The behavioral changes and electroencephalogram (EEG) of the mice in each group were observed. The cognitive functions were tested by Morris water maze test. The loss of hippocampal neurons was detected by hematoxylin-eosin (HE) staining and immunofluorescence analysis. Immunohistochemistry, western blot and q-PCR were employed to detect the expression of autophagy-related proteins and mTOR in the hippocampus and cortex. Less seizures, increased hippocampal neurons and reduced astrocytes of hippocampus were observed in the 3BDO-treated epileptic mice than in the PTZ-kindled epileptic mice. Morris water maze test results showed that 3BDO significantly improved the cognitive function of the PTZ-kindled epileptic mice. Western blot analyses and q-PCR revealed that 3BDO inhibited the expression of LC3, Beclin-1, Atg5, Atg7 and p-ULK1/ULK1, but increased that of p-mTOR/mTOR, p-P70S6K/P70S6K in the hippocampus and temporal lobe cortex of epileptic mice. Immunohistochemistry and immunofluorescence also showed 3BDO inhibited the LC3 expression and increased the mTOR expression in the hippocampus of epileptic mice. In addition, the autophagy activator EN6 reversed the decrease in the 3BDO-induced autophagy and aggravated the seizures and cognitive dysfunction in the epileptic mice. 3BDO regulates autophagy by activating the mTOR signaling pathway in PTZ-kindled epileptic mice model, thereby alleviating hippocampus neuronal loss and astrocytes proliferation, reducing seizures and effectively improving cognitive function. Therefore, 3BDO may have potential value in the treatment of epilepsy.
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Affiliation(s)
- Meiwen Guo
- Department of Neurology, the First Affiliated Hospital of Hainan Medical University, Haikou, China
- Key Laboratory of Brain Science Research & Transformation in Tropical Environment of Hainan Province, Hainan Medical University, Haikou, China
| | - Shuang Chen
- Department of Neurology, the First Affiliated Hospital of Hainan Medical University, Haikou, China
- Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jitong Lao
- Department of Neurology, the First Affiliated Hospital of Hainan Medical University, Haikou, China
- The Affiliated Brain Hospital of Guangzhou Medical University, Guangzhou, China
| | - Jiantang Liang
- Department of Neurology, the First Affiliated Hospital of Hainan Medical University, Haikou, China
- Key Laboratory of Brain Science Research & Transformation in Tropical Environment of Hainan Province, Hainan Medical University, Haikou, China
| | - Hao Chen
- Department of Neurology, the First Affiliated Hospital of Hainan Medical University, Haikou, China
- Key Laboratory of Brain Science Research & Transformation in Tropical Environment of Hainan Province, Hainan Medical University, Haikou, China
| | - Jingyi Tong
- Department of Neurology, the First Affiliated Hospital of Hainan Medical University, Haikou, China
- Key Laboratory of Brain Science Research & Transformation in Tropical Environment of Hainan Province, Hainan Medical University, Haikou, China
| | | | - Dandan Jia
- Department of Neurology, the First Affiliated Hospital of Hainan Medical University, Haikou, China.
- Key Laboratory of Brain Science Research & Transformation in Tropical Environment of Hainan Province, Hainan Medical University, Haikou, China.
| | - Qifu Li
- Department of Neurology, the First Affiliated Hospital of Hainan Medical University, Haikou, China.
- Key Laboratory of Brain Science Research & Transformation in Tropical Environment of Hainan Province, Hainan Medical University, Haikou, China.
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Exendin-4 Attenuates Hepatic Steatosis by Promoting the Autophagy-Lysosomal Pathway. BIOMED RESEARCH INTERNATIONAL 2022; 2022:4246086. [PMID: 35872844 PMCID: PMC9307340 DOI: 10.1155/2022/4246086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 06/16/2022] [Accepted: 06/21/2022] [Indexed: 11/30/2022]
Abstract
Dysregulated hepatic steatosis may lead to chronic liver inflammation and nonalcoholic steatohepatitis (NASH). Recent studies have suggested that exendin-4, a glucagon-like peptide-1 agonist, may be a promising therapeutic for hepatic steatosis and NASH. However, the molecular mechanisms underlying the antihepatic steatosis actions of exendin-4 are not fully clear. Here, we demonstrate that autophagy is activated by either palmitic acid (PA) or oleic acid (OA) in HepG2 cells, and exendin-4 further enhances the autophagy-lysosomal pathway. We show that inhibition of autophagy by shLC3 attenuates exendin-4-mediated antisteatotic activity. Furthermore, expression of a key lysosomal marker, lysosome associated membrane protein 1 (LAMP1), is upregulated in OA + exendin-4-treated cells. The colocalization of LAMP1 and LC3 puncta further suggests that autophagic flux was enhanced by the cotreatment. Based on these findings, we conclude that autophagic flux might play an important role in the antisteatotic action of exendin-4.
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