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卢 国, 孙 红, 孙 正, 刘 乐, 王 磊, 张 宁, 王 宇, 何 一, 纪 佳, 李 馨, 康 品, 唐 碧. [Effect of asiaticoside on systolic blood pressure and relaxation of isolated thoracic aorta of rats]. Nan Fang Yi Ke Da Xue Xue Bao 2024; 44:523-532. [PMID: 38597444 PMCID: PMC11006695 DOI: 10.12122/j.issn.1673-4254.2024.03.14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Indexed: 04/11/2024]
Abstract
OBJECTIVE To investigate the effect of asiaticoside on blood pressure and relaxation of thoracic aorta in rats and explore the underlying mechanism. METHODS SD rats treated with 50 and 100 mg/kg asiaticoside by daily gavage for 2 weeks were monitored for systolic blood pressure changes, and histological changes of the thoracic aorta were evaluated using HE staining. In isolated rat endothelium-intact and endothelium-denuded thoracic aorta rings, the effects of asiaticoside on relaxation of the aortic rings were tested at baseline and following norepinephrine (NE)- and KCl-induced constriction. The vascular relaxation effect of asiaticoside was further observed in NE-stimulated endothelium-intact rat aortic rings pretreated with L-nitroarginine methyl ester, indomethacin, zinc protoporphyrin Ⅸ, tetraethyl ammonium chloride, glibenclamide, barium chloride, Iberiotoxin, 4-aminopyridine, or TASK-1-IN-1. The aortic rings were treated with KCl and NE followed by increasing concentrations of CaCl2 to investigate the effect of asiaticoside on vasoconstriction induced by external calcium influx and internal calcium release. RESULTS Asiaticoside at 50 and 100 mg/kg significantly lowered systolic blood pressure in rats without affecting the thoracic aorta histomorphology. While not obviously affecting resting aortic rings with intact endothelium, asiaticoside at 100 mg/kg induced significant relaxation of the rings constricted by KCl and NE, but its effects differed between endothelium-intact and endothelium-denuded rings. In endothelium-intact aortic rings pretreated with indomethacin, ZnPP Ⅸ, barium chloride, glyburide, TASK-1-IN-1 and 4-aminopyridine, asiaticoside did not produce significant effect on NE-induced vasoconstriction, and tetraethylammonium, Iberiotoxin and L-nitroarginine methyl ester all inhibited the relaxation effect of asiaticoside. In KCland NE-treated rings, asiaticoside obviously inhibited CaCl2-induced vascular contraction. CONCLUSION Asiaticoside induces thoracic aorta relaxation by mediating high-conductance calcium-activated potassium channel opening, promoting nitric oxide release from endothelial cells and regulating Ca2+ influx and outflow, thereby reducing systolic blood pressure in rats.
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Affiliation(s)
- 国庆 卢
- 蚌埠医科大学第一附属医院心血管内科,安徽 蚌埠 233000Department of Cardiovascular Medicine, First Affiliated Hospital of Bengbu Medical University, Bengbu 233000, China
- 蚌埠医科大学心脑血管病研究中心生理学教研室,安徽 蚌埠 233000Department of Physiology, Cardiovascular and Cerebrovascular Disease Research Center, Bengbu Medical University, Bengbu 233000, China
| | - 红燕 孙
- 蚌埠医科大学第一附属医院心血管内科,安徽 蚌埠 233000Department of Cardiovascular Medicine, First Affiliated Hospital of Bengbu Medical University, Bengbu 233000, China
- 蚌埠医科大学心脑血管病研究中心生理学教研室,安徽 蚌埠 233000Department of Physiology, Cardiovascular and Cerebrovascular Disease Research Center, Bengbu Medical University, Bengbu 233000, China
| | - 正宇 孙
- 蚌埠医科大学第一附属医院心血管内科,安徽 蚌埠 233000Department of Cardiovascular Medicine, First Affiliated Hospital of Bengbu Medical University, Bengbu 233000, China
- 蚌埠医科大学心脑血管病研究中心生理学教研室,安徽 蚌埠 233000Department of Physiology, Cardiovascular and Cerebrovascular Disease Research Center, Bengbu Medical University, Bengbu 233000, China
| | - 乐强 刘
- 蚌埠医科大学临床医学院,安徽 蚌埠 233000College of Clinical Medicine, Bengbu Medical University, Bengbu 233000, China
| | - 磊 王
- 蚌埠医科大学第一附属医院心血管内科,安徽 蚌埠 233000Department of Cardiovascular Medicine, First Affiliated Hospital of Bengbu Medical University, Bengbu 233000, China
- 蚌埠医科大学心脑血管病研究中心生理学教研室,安徽 蚌埠 233000Department of Physiology, Cardiovascular and Cerebrovascular Disease Research Center, Bengbu Medical University, Bengbu 233000, China
| | - 宁宁 张
- 蚌埠医科大学第一附属医院心血管内科,安徽 蚌埠 233000Department of Cardiovascular Medicine, First Affiliated Hospital of Bengbu Medical University, Bengbu 233000, China
- 蚌埠医科大学心脑血管病研究中心生理学教研室,安徽 蚌埠 233000Department of Physiology, Cardiovascular and Cerebrovascular Disease Research Center, Bengbu Medical University, Bengbu 233000, China
| | - 宇航 王
- 蚌埠医科大学临床医学院,安徽 蚌埠 233000College of Clinical Medicine, Bengbu Medical University, Bengbu 233000, China
| | - 一鸣 何
- 蚌埠医科大学临床医学院,安徽 蚌埠 233000College of Clinical Medicine, Bengbu Medical University, Bengbu 233000, China
| | - 佳慧 纪
- 蚌埠医科大学临床医学院,安徽 蚌埠 233000College of Clinical Medicine, Bengbu Medical University, Bengbu 233000, China
| | - 馨月 李
- 蚌埠医科大学临床医学院,安徽 蚌埠 233000College of Clinical Medicine, Bengbu Medical University, Bengbu 233000, China
| | - 品方 康
- 蚌埠医科大学第一附属医院心血管内科,安徽 蚌埠 233000Department of Cardiovascular Medicine, First Affiliated Hospital of Bengbu Medical University, Bengbu 233000, China
- 蚌埠医科大学心脑血管病研究中心生理学教研室,安徽 蚌埠 233000Department of Physiology, Cardiovascular and Cerebrovascular Disease Research Center, Bengbu Medical University, Bengbu 233000, China
| | - 碧 唐
- 蚌埠医科大学第一附属医院心血管内科,安徽 蚌埠 233000Department of Cardiovascular Medicine, First Affiliated Hospital of Bengbu Medical University, Bengbu 233000, China
- 蚌埠医科大学心脑血管病研究中心生理学教研室,安徽 蚌埠 233000Department of Physiology, Cardiovascular and Cerebrovascular Disease Research Center, Bengbu Medical University, Bengbu 233000, China
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庞 碧, 黄 娜, 黄 晓, 李 馨, 熊 文, 孔 波, 姚 焱. [Lithocholic acid decreases mRNA stability of nuclear receptor PPAR α by upregulating miR-21 expression in hepatoma HepG2 cells]. Nan Fang Yi Ke Da Xue Xue Bao 2023; 43:2086-2094. [PMID: 38189395 PMCID: PMC10774099 DOI: 10.12122/j.issn.1673-4254.2023.12.13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Indexed: 01/09/2024]
Abstract
OBJECTIVE To investigate the regulatory effects of lithocholic acid (LCA) on nuclear receptor peroxisome proliferatoractivated receptor-alpha (PPARα) mRNA stability at the post-transcriptional level. METHODS PPARα 3'UTR luciferase reporter gene vectors were constructed and transfected into HepG2 cells to observe the changes in cellular luciferase activity in response to LCA treatments. Bioinformatic prediction and miRNA PCR array technique were used to identify the differentially expressed miRNAs induced by LCA and their potential binding sites on the 3'UTR. The binding sites (Mut1, Mut2 and Mut1+Mut2) were mutated to compare the changes in cellular luciferase activity following LCA treatment. Western blotting and RTqPCR were used to detect the activated signaling pathway and the expression levels of its downstream transcription factors in LCA-treated cells. The changes in PPARα protein expression level were detected in the cells following overexpression of the transcription factors. RESULTS Treatment with 100 μmol/L LCA significantly reduced luciferase activity of PPARα 3'UTR1 and 3'UTR2 in HepG2 cells by more than 50% (P<0.01) and induced significant upregulation of miR-21 and miR-22, especially the former (by 2.35 folds, P<0.05). Two predicted miR-21-binding sites in the 3'UTR1 were mutated to construct Mut1, Mut2 and Mut1+Mut2 reporter gene vectors. LCA treatment down-regulated 3'UTR1 luciferase activity by 51%, while Mut1, Mut2, and Mut1+Mut2 were down-regulated by 37%, 39%, and 13%, respectively. LCA caused ERK1/2 phosphorylation and activation of the ERK1/2 signaling pathway, and treatment with 100 μmol/L LCA upregulated the expression of transcription factor early growth response 1 (EGR1) by 5.83 folds (P<0.01). Transient overexpression of EGR1 significantly decreased cellular PPARα protein levels (P<0.05). CONCLUSION LCA reduces PPARα mRNA stability and thus decreases PPARα mRNA and protein expressions in hepatocytes by activating the ERK1/2 signaling pathway and upregulating EGR1 and miR-21, which targets 3'UTR regulatory region of PPARα mRNA.
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Affiliation(s)
- 碧滢 庞
- />广州大学生命科学学院,广东 广州 510000School of Life Science, Guangzhou University, Guangzhou 510000, China
| | - 娜娜 黄
- />广州大学生命科学学院,广东 广州 510000School of Life Science, Guangzhou University, Guangzhou 510000, China
| | - 晓霞 黄
- />广州大学生命科学学院,广东 广州 510000School of Life Science, Guangzhou University, Guangzhou 510000, China
| | - 馨 李
- />广州大学生命科学学院,广东 广州 510000School of Life Science, Guangzhou University, Guangzhou 510000, China
| | - 文婷 熊
- />广州大学生命科学学院,广东 广州 510000School of Life Science, Guangzhou University, Guangzhou 510000, China
| | - 波 孔
- />广州大学生命科学学院,广东 广州 510000School of Life Science, Guangzhou University, Guangzhou 510000, China
| | - 焱 姚
- />广州大学生命科学学院,广东 广州 510000School of Life Science, Guangzhou University, Guangzhou 510000, China
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