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Chen Y, He S, Zeng A, He S, Jin X, Li C, Mei W, Lu Q. Inhibitory Effect of β-Sitosterol on the Ang II-Induced Proliferation of A7r5 Aortic Smooth Muscle Cells. Anal Cell Pathol (Amst) 2023; 2023:2677020. [PMID: 38028434 PMCID: PMC10645495 DOI: 10.1155/2023/2677020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 08/01/2023] [Accepted: 09/27/2023] [Indexed: 12/01/2023] Open
Abstract
Objective To explore the effects of β-sitosterol on VSMC proliferation. Materials and Methods A7r5 cells were pretreated with 2 µM angiotensin II (Ang II) for 24 hr to establish an excessive VSMC proliferation model, followed by treatment with β-sitosterol for 24 hr. Cells were divided into five groups: control, Ang II, and Ang II + β-sitosterol (2, 4, 8 µM). CCK-8 assay, flow cytometry, and Ad-mCherry-GFP-LC3B assay analyzed cell proliferation, cell cycle, cell apoptosis, and autophagic flux. Additionally, the expression of proteins was detected by the western blotting. Results β-Sitosterol effectively inhibited Ang II-induced A7r5 cell proliferation (IC50 : 6.841 µM at 24 hr). It achieved this by arresting cell cycle progression, promoting apoptosis, inhibiting autophagy, and suppressing the contractile-synthetic phenotypic switch. Mechanistically, β-sitosterol downregulated PCNA, Cyclin D1, and Bcl-2, while upregulating pro-caspase 3, cleaved-caspase 3, and Bax to induce cell cycle arrest and apoptosis. Additionally, it suppressed the contractile-synthetic phenotypic transformation by downregulating OPN and upregulating α-SMA. The Ad-mCherry-GFP-LC3B Assay and western blotting revealed β-sitosterol's autophagy inhibitory effects by downregulating LC3, ULK1, and Beclin-1 while upregulating P62 expression. Discussion and Conclusion. This study found for the first time that β-sitosterol could inhibit the proliferation of A7r5 cells induced by Ang II. β-Sitosterol treatment may be recommended as a therapeutic strategy to prevent the cardiovascular diseases.
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Affiliation(s)
- Yuankun Chen
- School of Basic Medical Sciences, Guangdong Pharmaceutical University, No. 280 East Outer Ring Road, Panyu District, Guangzhou, China
- Department of Infectious and Tropical Diseases, The Second Affiliated Hospital of Hainan Medical University, Haikou, China
| | - Shumiao He
- School of Basic Medical Sciences, Guangdong Pharmaceutical University, No. 280 East Outer Ring Road, Panyu District, Guangzhou, China
- Guangdong Province Key Laboratory of Pharmaceutical Bioactive Substances, Guangdong Pharmaceutical University, Guangzhou, China
| | - Ao Zeng
- School of Basic Medical Sciences, Guangdong Pharmaceutical University, No. 280 East Outer Ring Road, Panyu District, Guangzhou, China
| | - Siqing He
- School of Basic Medical Sciences, Guangdong Pharmaceutical University, No. 280 East Outer Ring Road, Panyu District, Guangzhou, China
| | - Xiaobao Jin
- Guangdong Province Key Laboratory of Pharmaceutical Bioactive Substances, Guangdong Pharmaceutical University, Guangzhou, China
| | - Chunmei Li
- School of Basic Medical Sciences, Guangdong Pharmaceutical University, No. 280 East Outer Ring Road, Panyu District, Guangzhou, China
- Guangdong Province Engineering and Technology Center for Molecular Probe and Bio-medicine Imaging, Guangzhou, China
| | - Wenjie Mei
- Guangdong Province Key Laboratory of Pharmaceutical Bioactive Substances, Guangdong Pharmaceutical University, Guangzhou, China
| | - Qun Lu
- School of Basic Medical Sciences, Guangdong Pharmaceutical University, No. 280 East Outer Ring Road, Panyu District, Guangzhou, China
- Guangdong Province Key Laboratory of Pharmaceutical Bioactive Substances, Guangdong Pharmaceutical University, Guangzhou, China
- Guangdong Province Engineering and Technology Center for Molecular Probe and Bio-medicine Imaging, Guangzhou, China
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Wang H, Liu J, Wang M, Yang C, Wang G, Hu T. The adverse effect of anticancer drug toremifene on vascular smooth muscle cells is an important aspect of its tumor growth inhibition. J Cancer Res Clin Oncol 2023; 149:7837-7848. [PMID: 37036506 DOI: 10.1007/s00432-023-04744-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Accepted: 04/03/2023] [Indexed: 04/11/2023]
Abstract
PURPOSE Toremifene (TOR) is widely used as an antineoplastic drug and has an inhibitory effect on angiogenesis in mesenteric desmoid tumors and vascular intracranial solitary fibrous tumors. However, no study has investigated the direct effect of TOR on vascular cells. This study aimed at exploring the effect of TOR on the behaviors of vascular smooth muscle cells (VSMCs). METHODS Human aortic umbilical vascular smooth muscle cells (HAVSMCs) were treated by TOR. Cell morphology, migration, adhesion, and proliferation assay were investigated. The cell cycle, apoptosis, mitochondrial membrane potential, and reactive oxygen species were assessed using flow cytometry. Caspase-3 and 9 activities were assayed using Caspase-3 and Caspase-9 Activity Assay kits, respectively. Immunofluorescence and Western blot assays were carried out to characterize protein expressions of PCNA, p53, and Rho/ROCK signaling pathway. RESULTS TOR damaged cytoskeleton, inhibited VSMC proliferation, migration, and adhesion, and induced abnormal cell morphology and apoptosis. The antiproliferative activity of TOR was associated with the induction of G0/G1 phase arrest, blocking the cell cycle. TOR disrupted intracellular reactive oxygen species and mitochondrial membrane potential, and enhanced p53 expression and the activities of caspase-3 and caspase-9. Thus, TOR-induced apoptosis by the mitochondrial signaling pathway. Additionally, TOR induced decreased Rho, ROCK, MLC, and pMLC proteins. Collectively, TOR may affect multiple behaviors of VSMCs by damaging cytoskeleton through the Rho/ROCK pathway. CONCLUSION The adverse effect of TOR on VSMCs could be considered as an important aspect of tumor growth inhibition.
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Affiliation(s)
- Huiyun Wang
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing, 400030, China
| | - Juan Liu
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing, 400030, China
| | - Mingxing Wang
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing, 400030, China
| | - Chun Yang
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing, 400030, China
| | - Guixue Wang
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing, 400030, China
| | - Tingzhang Hu
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing, 400030, China.
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Salemkour Y, Lenoir O. Endothelial Autophagy Dysregulation in Diabetes. Cells 2023; 12:cells12060947. [PMID: 36980288 PMCID: PMC10047205 DOI: 10.3390/cells12060947] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2023] [Revised: 03/14/2023] [Accepted: 03/16/2023] [Indexed: 03/30/2023] Open
Abstract
Diabetes mellitus is a major public health issue that affected 537 million people worldwide in 2021, a number that is only expected to increase in the upcoming decade. Diabetes is a systemic metabolic disease with devastating macro- and microvascular complications. Endothelial dysfunction is a key determinant in the pathogenesis of diabetes. Dysfunctional endothelium leads to vasoconstriction by decreased nitric oxide bioavailability and increased expression of vasoconstrictor factors, vascular inflammation through the production of pro-inflammatory cytokines, a loss of microvascular density leading to low organ perfusion, procoagulopathy, and/or arterial stiffening. Autophagy, a lysosomal recycling process, appears to play an important role in endothelial cells, ensuring endothelial homeostasis and functions. Previous reports have provided evidence of autophagic flux impairment in patients with type I or type II diabetes. In this review, we report evidence of endothelial autophagy dysfunction during diabetes. We discuss the mechanisms driving endothelial autophagic flux impairment and summarize therapeutic strategies targeting autophagy in diabetes.
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Affiliation(s)
- Yann Salemkour
- PARCC, Inserm, Université Paris Cité, 75015 Paris, France
| | - Olivia Lenoir
- PARCC, Inserm, Université Paris Cité, 75015 Paris, France
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4
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Lin F, Chen Y, Mo W, Zhou H, Xiao Z, Hu S, Shi X, Liu M, Wei J, Zhu W, Wang S, Lv X. A bibliometric analysis of autophagy in lung diseases from 2012 to 2021. Front Immunol 2022; 13:1092575. [PMID: 36591291 PMCID: PMC9802149 DOI: 10.3389/fimmu.2022.1092575] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Accepted: 11/28/2022] [Indexed: 12/23/2022] Open
Abstract
Background Autophagy refers to the process in which cells wrap their damaged organelles or unwanted proteins into a double-membrane structure and direct them to lysosomes for degradation. Autophagy can regulate many lung diseases such as pulmonary hypertension, acute lung injury, and lung cancer. However, few bibliometric studies on autophagy are available. The aim of the present study was to clarify the role of autophagy in lung diseases by bibliometric analysis. Methods Publications were retrieved from the 2012-2021 Science Citation Index Expanded of Web of Science Core Collection on 20 September 2022. Bibliometrix package in R software was used for data retrieval. VOSviewer and CiteSpace were used to visualize the research focus and trend regarding the effect of autophagy on lung disease. Results A total of 4,522 original articles and reviews on autophagy in lung diseases published between 2012 and 2021 were identified. China had the largest number of published papers and citations, whereas the United States (US) ranked first in the H-index and G-index. Moreover, cooperation network analysis showed close cooperation between the US, China, and some European countries, and the top 10 affiliates were all from these countries and regions. Bibliometric analysis showed that "autophagy" and "apoptosis" were the keywords with the highest frequency. During the past decade, most studies were concerned with basic research on pathways related to the regulatory role of autophagy in the inhibition and attenuation of lung diseases. Conclusion The study of autophagy in lung diseases is still in the development stage. The information published in these articles has helped researchers understand further the hot spots and development trends in the field more and learn about the collaboration network information regarding authors, countries, and institutions, as well as the paper citation correlation. More studies have been performed to gain deeper insights into the pathogenesis of autophagy by focusing on the links and effects between various diseases. More recently, research in this field has paid increasing attention to the function of autophagy in COVID-19-related lung diseases.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | - Xin Lv
- *Correspondence: Xin Lv, ; Sheng Wang,
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5
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Kobara M, Toba H, Nakata T. Roles of autophagy in angiotensin II-induced cardiomyocyte apoptosis. Clin Exp Pharmacol Physiol 2022; 49:1342-1351. [PMID: 36059129 DOI: 10.1111/1440-1681.13719] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 08/25/2022] [Accepted: 09/01/2022] [Indexed: 01/31/2023]
Abstract
Autophagy is a self-degradation process of cytoplasmic components and occurs in the failing heart. Angiotensin II plays a critical role in the progression of heart failure and induces autophagy. We investigated the mechanism underlying angiotensin II-enhanced autophagy and examined the role of autophagy in angiotensin II-induced cardiomyocyte injury. Neonatal rat cardiomyocytes were treated with angiotensin II (1-100 nmol/L). Angiotensin II dose-dependently increased autophagy indicators of microtubule-associated protein 1 light chain (LC) 3-II and monodansylcadaverine-labelled vesicles. It also enhanced the intracellular production of reactive oxygen species (ROS), assessed by H2DCFDA, an intracellular ROS indicator. NADPH oxidase- and mitochondria-derived ROS production was increased by angiotensin II, while angiotensin II-induced LC3-II expression was suppressed by inhibitors of these sources of ROS. Confocal microscopy revealed that superoxide-producing mitochondria colocalized with lysosomes after the angiotensin II stimulation. Myocyte apoptosis was assessed by nuclear staining with DAPI and caspase-3 activity. A 6-h stimulation with angiotensin II did not affect myocyte apoptosis, while a co-treatment with 3-methyl-adenine (3MA), an autophagy inhibitor, augmented apoptosis. These results indicate that autophagy suppressed apoptosis because it removed damaged mitochondria in the early stages of the angiotensin II stimulation. A longer angiotensin II stimulation for 24 h induced apoptosis and propidium iodide-positive lethal myocytes, while the co-treatment with 3MA did not lead to further increases. In conclusion, angiotensin II-induced autophagy removes ROS-producing mitochondria. Autophagy is a beneficial phenomenon against myocyte apoptosis in the early phase, but its benefit was limited in the late phase of angiotensin II stimulation.
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Affiliation(s)
- Miyuki Kobara
- Department of Clinical Pharmacology, Division of Pathological Science, Kyoto Pharmaceutical University, Kyoto, Japan
| | - Hiroe Toba
- Department of Clinical Pharmacology, Division of Pathological Science, Kyoto Pharmaceutical University, Kyoto, Japan
| | - Tetsuo Nakata
- Department of Clinical Pharmacology, Division of Pathological Science, Kyoto Pharmaceutical University, Kyoto, Japan
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Kwon Y, Haam CE, Byeon S, Choi SK, Lee YH. Effects of 3-methyladenine, an autophagy inhibitor, on the elevated blood pressure and arterial dysfunction of angiotensin II-induced hypertensive mice. Biomed Pharmacother 2022; 154:113588. [PMID: 35994821 DOI: 10.1016/j.biopha.2022.113588] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2022] [Revised: 08/17/2022] [Accepted: 08/17/2022] [Indexed: 11/19/2022] Open
Abstract
Autophagy is an intracellular degradation system that disassembles cytoplasmic components through autophagosomes fused with lysosomes. Recently, it has been reported that autophagy is associated with cardiovascular diseases, including pulmonary hypertension, atherosclerosis, and myocardial ischemia. However, the involvement of autophagy in hypertension is not well understood. In the present study, we hypothesized that excessive autophagy contributes to the dysfunction of mesenteric arteries in angiotensin II (Ang II)-induced hypertensive mice. Treatment of an autophagy inhibitor, 3-methyladenine (3-MA), reduced the elevated blood pressure and wall thickness, and improved endothelium-dependent relaxation in mesenteric arteries of Ang II-treated mice. The expression levels of autophagy markers, beclin1 and LC3 II, were significantly increased by Ang II infusion, which was reduced by treatment of 3-MA. Furthermore, treatment of 3-MA induced vasodilation in the mesenteric resistance arteries pre-contracted with U46619 or phenylephrine, which was dependent on endothelium. Interestingly, nitric oxide production and phosphorylated endothelial nitric oxide synthase (p-eNOS) at S1177 in the mesenteric arteries of Ang II-treated mice were increased by treatment with 3-MA. In HUVECs, p-eNOS was reduced by Ang II, which was increased by treatment of 3-MA. 3-MA had direct vasodilatory effect on the pre-contracted mesenteric arteries. In cultured vascular smooth muscle cells (VSMCs), Ang II induced increase in beclin1 and LC3 II and decrease in p62, which was reversed by treatment of 3-MA. These results suggest that autophagy inhibition exerts beneficial effects on the dysfunction of mesenteric arteries in hypertension.
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Affiliation(s)
- Youngin Kwon
- Department of Physiology, College of Medicine, Brain Korea 21 PLUS Project for Medical Sciences, Yonsei University, 50 Yonseiro, Seodaemun-gu, Seoul 03722, the Republic of the Korea
| | - Chae Eun Haam
- Department of Physiology, College of Medicine, Brain Korea 21 PLUS Project for Medical Sciences, Yonsei University, 50 Yonseiro, Seodaemun-gu, Seoul 03722, the Republic of the Korea
| | - Seonhee Byeon
- Department of Physiology, College of Medicine, Brain Korea 21 PLUS Project for Medical Sciences, Yonsei University, 50 Yonseiro, Seodaemun-gu, Seoul 03722, the Republic of the Korea
| | - Soo-Kyoung Choi
- Department of Physiology, College of Medicine, Brain Korea 21 PLUS Project for Medical Sciences, Yonsei University, 50 Yonseiro, Seodaemun-gu, Seoul 03722, the Republic of the Korea.
| | - Young-Ho Lee
- Department of Physiology, College of Medicine, Brain Korea 21 PLUS Project for Medical Sciences, Yonsei University, 50 Yonseiro, Seodaemun-gu, Seoul 03722, the Republic of the Korea.
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Zhu P, Chen G, Liu Y, Wang Q, Wang M, Hu T. Microcystin-leucine arginine exhibits adverse effects on human aortic vascular smooth muscle cells in vitro. Toxicol In Vitro 2022; 84:105450. [PMID: 35905885 DOI: 10.1016/j.tiv.2022.105450] [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: 06/08/2022] [Revised: 07/14/2022] [Accepted: 07/22/2022] [Indexed: 11/18/2022]
Abstract
Microcystin-leucine arginine (MC-LR) is a kind of toxin produced by cyanobacteria, which can do harm to human and livestock health. MC-LR can easily enter tissues and organs through the blood circulation and accumulate in certain target organs. Vessels are prone to contact with MC-LR during growth and development. Previous study had demonstrated that MC-LR had potential vascular toxicity. However, it is not clear whether MC-LR has adverse effects on vascular smooth muscle cells. In this study, we evaluated the cytotoxicity of MC-LR exposure (0.01, 0.05, 0.1, 0.5, and 1 μM) on human aortic vascular smooth muscle cells (HAVSMCs) in vitro. The data showed that MC-LR exposure inhibited the HAVSMC proliferation and migration, induced HAVSMC apoptosis, cytoskeleton destruction, S-phase arrest, mitochondrial transmembrane potential (MMP) loss, and reactive oxygen species (ROS) production. In addition, MC-LR exposure resulted in the imbalance between oxidants and antioxidants, increased the caspase-3 and caspase-9 activities, and down-regulated the gene expressions (integrin β1, Rho, ROCK, MLC). Taken together, MC-LR could induce the generation of ROS in HAVSMCs, leading to apoptosis by the mitochondrial signaling pathway. MC-LR could also induce cytoskeletal disruption by integrin-mediated FAK/ROCK signaling pathway, leading to cell cycle arrest and the inhibition of HAVSMCs proliferation and migration. The current findings facilitate an understanding of the mechanism of MC-LR toxicity involved in angiocardiopathy.
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Affiliation(s)
- Panpan Zhu
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing 400030, China
| | - Guoliang Chen
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing 400030, China
| | - Yuanli Liu
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing 400030, China
| | - Qilong Wang
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing 400030, China
| | - Mingxing Wang
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing 400030, China
| | - Tingzhang Hu
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing 400030, China.
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Jia J, Tao X, Tian Z, Liu J, Ye X, Zhan Y. Vitamin D receptor deficiency increases systolic blood pressure by upregulating the renin‑angiotensin system and autophagy. Exp Ther Med 2022; 23:314. [PMID: 35369533 PMCID: PMC8943549 DOI: 10.3892/etm.2022.11243] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Accepted: 11/30/2021] [Indexed: 11/06/2022] Open
Abstract
The vitamin D receptor (VDR) may regulate blood pressure via multiple pathways. The present study investigated the underlying mechanism by which VDR deficiency increases blood pressure. A total of 16 8-week-old male littermate mice were randomly divided into the VDR knockout and wild-type groups (VDR-/- and VDR+/+, respectively). Blood pressure was measured using a four-channel PowerLab data acquisition and ADI software analysis system. After euthanasia, vascular smooth muscle cells (VSMCs) were isolated from the VDR-/- and VDR+/+ mice. Oxidative stress, renin-angiotensin system (RAS) activation and autophagy markers were measured in the isolated VSMCs using reverse transcription-quantitative PCR (RT-qPCR), western blotting and transmission electron microscopy (TEM) assays. Mean systolic pressure was significantly higher in the VDR-/- mice compared with the VDR+/+ mice. RT-qPCR and western blotting analyses indicated that RAS markers (angiotensin II and II type 1 receptor) were significantly upregulated, oxidative stress was increased (evidenced by reduced superoxide dismutase and peroxiredoxin-4) and autophagy was activated (upregulation of autophagy related protein 7, Beclin 1 and microtubule-associated proteins 1A/1B light chain 3A) in the VDR-/- VSMCs compared with the VDR+/+ VSMCs. TEM demonstrated that there were more autophagy bodies in the VDR-/- VSMCs compared with the VDR+/+ VSMCs. In conclusion, VDR deficiency was associated with high blood pressure. The mechanism underlying the increase in blood pressure caused by VDR deficiency may involve activation of the RAS, as well as increased oxidative stress and autophagy of VSMCs.
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Affiliation(s)
- Jian Jia
- Department of General Practice, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China
| | - Xu Tao
- Department of Geriatric Medicine, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China
| | - Zhouning Tian
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China
| | - Jing Liu
- The First School of Clinical Medicine, Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China
| | - Xiaoman Ye
- Department of Geriatric Medicine, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China
| | - Yiyang Zhan
- Department of Geriatric Medicine, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China
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Mondaca-Ruff D, Quiroga C, Norambuena-Soto I, Riquelme JA, San Martin A, Bustamante M, Lavandero S, Chiong M. Regulation of total LC3 levels by angiotensin II in vascular smooth muscle cells. J Cell Mol Med 2022; 26:1710-1713. [PMID: 35118791 PMCID: PMC8899170 DOI: 10.1111/jcmm.17215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 11/30/2021] [Accepted: 01/12/2022] [Indexed: 11/30/2022] Open
Abstract
Hypertension is associated with high circulating angiotensin II (Ang II). We have reported that autophagy regulates Ang II‐induced vascular smooth muscle cell (VSMC) hypertrophy, but the mechanism mediating this effect is still unknown. Therefore, we studied how Ang II regulates LC3 levels in VSMCs and whether Bag3, a co‐chaperone known to regulate LC3 total levels, may be involved in the effects elicited by Ang II. A7r5 cell line or rat aortic smooth muscle cell (RASMC) primary culture were stimulated with Ang II 100 nM for 24 h and LC3 I, LC3 II and Bag3 protein levels were determined by Western blot. MAP1LC3B mRNA levels were assessed by RT‐qPCR. Ang II increased MAP1LC3B mRNA levels and protein levels of LC3 I, LC3 II and total LC3 (LC3 I + LC3 II). Cycloheximide, but not actinomycin D, abolished LC3 II and total LC3 increase elicited by Ang II in RASMCs. In A7r5 cells, cycloheximide prevented the Ang II‐mediated increase of LC3 I and total LC3, but not LC3 II. Moreover, Ang II increased Bag3 levels, but this increase was not observed upon co‐administration with either losartan 1 μM (AT1R antagonist) or Y‐27632 10 μM (ROCK inhibitor). These results suggest that Ang II may regulate total LC3 content through transcriptional and translational mechanisms. Moreover, Bag3 is increased in response to Ang II by a AT1R/ROCK signalling pathway. These data provide preliminary evidence suggesting that Ang II may stimulate autophagy in VSMCs by increasing total LC3 content and LC3 processing.
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Affiliation(s)
- David Mondaca-Ruff
- Advanced Center for Chronic Diseases (ACCDiS), Facultad Ciencias Químicas y Farmacéuticas & Facultad Medicina, Universidad de Chile, Santiago, Chile
| | - Clara Quiroga
- Advanced Center for Chronic Diseases (ACCDiS), Facultad Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Ignacio Norambuena-Soto
- Advanced Center for Chronic Diseases (ACCDiS), Facultad Ciencias Químicas y Farmacéuticas & Facultad Medicina, Universidad de Chile, Santiago, Chile
| | - Jaime A Riquelme
- Advanced Center for Chronic Diseases (ACCDiS), Facultad Ciencias Químicas y Farmacéuticas & Facultad Medicina, Universidad de Chile, Santiago, Chile
| | - Alejandra San Martin
- Division of Cardiology, Department of Medicine, Emory University, Atlanta, Georgia, USA
| | - Mario Bustamante
- Advanced Center for Chronic Diseases (ACCDiS), Facultad Ciencias Químicas y Farmacéuticas & Facultad Medicina, Universidad de Chile, Santiago, Chile.,Advanced Center for Chronic Diseases (ACCDiS), Facultad Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Sergio Lavandero
- Advanced Center for Chronic Diseases (ACCDiS), Facultad Ciencias Químicas y Farmacéuticas & Facultad Medicina, Universidad de Chile, Santiago, Chile.,Department of Internal Medicine (Cardiology Division), University of Texas Southwestern Medical Center, Dallas, Texas, USA.,Corporacion Centro de Estudios Cientificos de las Enfermedades Cronicas (CECEC), Santiago, Chile
| | - Mario Chiong
- Advanced Center for Chronic Diseases (ACCDiS), Facultad Ciencias Químicas y Farmacéuticas & Facultad Medicina, Universidad de Chile, Santiago, Chile
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Kim J, Mondaca-Ruff D, Singh S, Wang Y. SIRT1 and Autophagy: Implications in Endocrine Disorders. Front Endocrinol (Lausanne) 2022; 13:930919. [PMID: 35909524 PMCID: PMC9331929 DOI: 10.3389/fendo.2022.930919] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Accepted: 06/20/2022] [Indexed: 11/26/2022] Open
Abstract
Autophagy is a cellular process involved in the selective degradation and recycling of dysfunctional intracellular components. It plays a crucial role in maintaining cellular homeostasis and survival by removing damaged and harmful proteins, lipids, and organelles. SIRT1, an NAD+-dependent multifunctional enzyme, is a key regulator of the autophagy process. Through its deacetylase activity, SIRT1 participates in the regulation of different steps of autophagy, from initiation to degradation. The levels and function of SIRT1 are also regulated by the autophagy process. Dysregulation in SIRT1-mediated autophagy hinders the proper functioning of the endocrine system, contributing to the onset and progression of endocrine disorders. This review provides an overview of the crosstalk between SIRT1 and autophagy and their implications in obesity, type-2 diabetes mellitus, diabetic cardiomyopathy, and hepatic steatosis.
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Sanhueza-Olivares F, Troncoso MF, Pino-de la Fuente F, Martinez-Bilbao J, Riquelme JA, Norambuena-Soto I, Villa M, Lavandero S, Castro PF, Chiong M. A potential role of autophagy-mediated vascular senescence in the pathophysiology of HFpEF. Front Endocrinol (Lausanne) 2022; 13:1057349. [PMID: 36465616 PMCID: PMC9713703 DOI: 10.3389/fendo.2022.1057349] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Accepted: 10/26/2022] [Indexed: 11/18/2022] Open
Abstract
Heart failure with preserved ejection fraction (HFpEF) is one of the most complex and most prevalent cardiometabolic diseases in aging population. Age, obesity, diabetes, and hypertension are the main comorbidities of HFpEF. Microvascular dysfunction and vascular remodeling play a major role in its development. Among the many mechanisms involved in this process, vascular stiffening has been described as one the most prevalent during HFpEF, leading to ventricular-vascular uncoupling and mismatches in aged HFpEF patients. Aged blood vessels display an increased number of senescent endothelial cells (ECs) and vascular smooth muscle cells (VSMCs). This is consistent with the fact that EC and cardiomyocyte cell senescence has been reported during HFpEF. Autophagy plays a major role in VSMCs physiology, regulating phenotypic switch between contractile and synthetic phenotypes. It has also been described that autophagy can regulate arterial stiffening and EC and VSMC senescence. Many studies now support the notion that targeting autophagy would help with the treatment of many cardiovascular and metabolic diseases. In this review, we discuss the mechanisms involved in autophagy-mediated vascular senescence and whether this could be a driver in the development and progression of HFpEF.
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Affiliation(s)
- Fernanda Sanhueza-Olivares
- Advanced Center for Chronic Diseases (ACCDiS), Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Santiago, Chile
| | - Mayarling F. Troncoso
- Advanced Center for Chronic Diseases (ACCDiS), Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Santiago, Chile
| | - Francisco Pino-de la Fuente
- Advanced Center for Chronic Diseases (ACCDiS), Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Santiago, Chile
| | - Javiera Martinez-Bilbao
- Advanced Center for Chronic Diseases (ACCDiS), Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Santiago, Chile
| | - Jaime A. Riquelme
- Advanced Center for Chronic Diseases (ACCDiS), Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Santiago, Chile
| | - Ignacio Norambuena-Soto
- Advanced Center for Chronic Diseases (ACCDiS), Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Santiago, Chile
| | - Monica Villa
- Advanced Center for Chronic Diseases (ACCDiS), Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Santiago, Chile
| | - Sergio Lavandero
- Advanced Center for Chronic Diseases (ACCDiS), Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Santiago, Chile
- Division of Cardiology, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, United States
| | - Pablo F. Castro
- Advanced Center for Chronic Diseases, Faculty of Medicine, Pontifical University Catholic of Chile, Santiago, Chile
| | - Mario Chiong
- Advanced Center for Chronic Diseases (ACCDiS), Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Santiago, Chile
- *Correspondence: Mario Chiong,
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12
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Uchikado Y, Ikeda Y, Sasaki Y, Iwabayashi M, Akasaki Y, Ohishi M. Association of Lectin-Like Oxidized Low-Density Lipoprotein Receptor-1 With Angiotensin II Type 1 Receptor Impacts Mitochondrial Quality Control, Offering Promise for the Treatment of Vascular Senescence. Front Cardiovasc Med 2021; 8:788655. [PMID: 34869701 PMCID: PMC8637926 DOI: 10.3389/fcvm.2021.788655] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2021] [Accepted: 10/26/2021] [Indexed: 12/14/2022] Open
Abstract
Lectin-like oxidized low-density lipoprotein (ox-LDL) causes vascular senescence and atherosclerosis. It has been reported that ox-LDL scavenger receptor-1 (LOX-1) is associated with the angiotensin II type 1 receptor (AT1R). While mitochondria play a crucial role in the development of vascular senescence and atherosclerosis, they also undergo quality control through mitochondrial dynamics and autophagy. The aim of this study was to investigate (1) whether LOX-1 associates with AT1R, (2) if this regulates mitochondrial quality control, and (3) whether AT1R inhibition using Candesartan might ameliorate ox-LDL-induced vascular senescence. We performed in vitro and in vivo experiments using vascular smooth muscle cells (VSMCs), and C57BL/6 and apolipoprotein E-deficient (ApoE KO) mice. Administration of oxidized low-density lipoprotein (ox-LDL) to VSMCs induced mitochondrial dysfunction and cellular senescence accompanied by excessive mitochondrial fission, due to the activation of fission factor Drp1, which was derived from the activation of the Raf/MEK/ERK pathway. Administration of either Drp1 inhibitor, mdivi-1, or AT1R blocker candesartan attenuated these alterations. Electron microscopy and immunohistochemistry of the co-localization of LAMP2 with TOMM20 signal showed that AT1R inhibition also increased mitochondrial autophagy, but this was not affected by Atg7 deficiency. Conversely, AT1R inhibition increased the co-localization of LAMP2 with Rab9 signal. Moreover, AT1R inhibition-induced mitochondrial autophagy was abolished by Rab9 deficiency, suggesting that AT1R signaling modulated mitochondrial autophagy derived from Rab9-dependent alternative autophagy. Inhibition of the Raf/MEK/ERK pathway also decreased the excessive mitochondrial fission, and Rab9-dependent mitochondrial autophagy, suggesting that AT1R signaling followed the Raf/MEK/ERK axis modulated both mitochondrial dynamics and autophagy. The degree of mitochondrial dysfunction, reactive oxygen species production, vascular senescence, atherosclerosis, and the number of fragmented mitochondria accompanied by Drp1 activation were all higher in ApoE KO mice than in C57BL/6 mice. These detrimental alterations were successfully restored, and mitochondrial autophagy was upregulated with the administration of candesartan to ApoE KO mice. The association of LOX-1 with AT1R was found to play a crucial role in regulating mitochondrial quality control, as cellular/vascular senescence is induced by ox-LDL, and AT1R inhibition improves the adverse effects of ox-LDL.
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Affiliation(s)
- Yoshihiro Uchikado
- Department of Cardiovascular Medicine and Hypertension, Graduate School of Medical and Dental Sciences Kagoshima University, Kagoshima, Japan
| | - Yoshiyuki Ikeda
- Department of Cardiovascular Medicine and Hypertension, Graduate School of Medical and Dental Sciences Kagoshima University, Kagoshima, Japan
| | - Yuichi Sasaki
- Department of Cardiovascular Medicine and Hypertension, Graduate School of Medical and Dental Sciences Kagoshima University, Kagoshima, Japan
| | - Masaaki Iwabayashi
- Department of Cardiovascular Medicine and Hypertension, Graduate School of Medical and Dental Sciences Kagoshima University, Kagoshima, Japan
| | - Yuichi Akasaki
- Department of Cardiovascular Medicine and Hypertension, Graduate School of Medical and Dental Sciences Kagoshima University, Kagoshima, Japan
| | - Mitsuru Ohishi
- Department of Cardiovascular Medicine and Hypertension, Graduate School of Medical and Dental Sciences Kagoshima University, Kagoshima, Japan
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13
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Zhang Q, Wang L, Chen G, Wang M, Hu T. Cylindrospermopsin impairs vascular smooth muscle cells by P53-mediated apoptosis due to ROS overproduction. Toxicol Lett 2021; 353:83-92. [PMID: 34687773 DOI: 10.1016/j.toxlet.2021.10.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2021] [Revised: 09/05/2021] [Accepted: 10/14/2021] [Indexed: 02/07/2023]
Abstract
Cylindrospermopsin (CYN) is a toxic secondary metabolite from cyanobacteria that can cause cardiovascular disease. However, the study of CYN-induced cardiovascular toxicity in vitro is very limited and the mechanism is remain to be clarified. Vascular smooth muscle cells (VMSCs) have an important function in maintaining the structural and functional integrity of the aortic wall, and are an important in vitro model for cardiovascular research. Thus, the effects of CYN exposure (2, 20, 200, and 2000 nM) on VMSCs were analyzed. In vitro study, results showed that CYN exposure decreased VMSCs viability, inhibited VMSCs migration, induced DNA damage, destroyed cytoskeleton, changed cell morphology, promoted VMSCs apoptosis, and increased intracellular reactive oxygen species (ROS) levels. In addition, CYN could induce the activities of SOD, CAT and GPX, and promote the expressions of SOD1, CAT, GPx1, p53 and Bax genes and inhibit the expression of Bcl-2 gene, leading to a higher ratio of Bax/Bcl-2. Taken together, CYN may induce ROS overproduction, leading to increased p53 expression and ultimately promoting VSMC apoptosis. Therefore, the present study demonstrates that CYN could impair VMSCs, leading to vascular developmental defects and angiocardiopathy.
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Affiliation(s)
- Qian Zhang
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing, 400030, China
| | - Linping Wang
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing, 400030, China
| | - Guoliang Chen
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing, 400030, China
| | - Mingxing Wang
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing, 400030, China
| | - Tingzhang Hu
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing, 400030, China.
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14
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Wu Q, Luo F, Wang XL, Lin Q, Liu GQ. Angiotensin I-converting enzyme inhibitory peptide: an emerging candidate for vascular dysfunction therapy. Crit Rev Biotechnol 2021; 42:736-755. [PMID: 34634988 DOI: 10.1080/07388551.2021.1948816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Abnormal vasoconstriction, inflammation, and vascular remodeling can be promoted by angiotensin II (Ang II) in the renin-angiotensin system (RAS), leading to vascular dysfunction diseases such as hypertension and atherosclerosis. Researchers have recently focused on angiotensin I-converting enzyme inhibitory peptides (ACEIPs), that have desirable efficacy in vascular dysfunction therapy due to Ang II reduction by inhibiting ACE activity. Promising methods for the large-scale preparation of ACEIPs include selective enzymatic hydrolysis and microbial fermentation. Thus far, ACEIPs have been widely reported to be hydrolyzed from protein-rich sources, including animals, plants, and marine organisms, while many emerging microorganism-derived ACEIPs are theoretically biosynthesized through the nonribosomal peptide synthase (NRPS) pathway. Notably, vasodilatation, anti-inflammation, and vascular reconstruction reversal of ACEIPs are strongly correlated. However, the related molecular mechanisms underlying signal transduction regulation in vivo remain unclear. We provide a comprehensive update of the ACE-Ang II-G protein-coupled type 1 angiotensin receptor (AT1R) axis signaling and its functional significance for potential translation into therapeutic strategies, particularly targeting AT1R by ACEIPs, as well as specific related signaling pathways. Future studies are expected to verify the biosynthetic regulatory mechanism of ACEIPs via the NRPS pathway, the effect of gut microbiota metabolism on vascular dysfunction and rigorous studies of ACE-Ang II-AT1R signaling pathways mediated by ACEIPs in large animals and humans.
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Affiliation(s)
- Qiang Wu
- International Cooperation Base of Science and Technology Innovation on Forest Resource Biotechnology of Hunan Province, Central South University of Forestry and Technology, Changsha, China.,College of Food and Chemical Engineering, Shaoyang University, Shaoyang, China
| | - Feijun Luo
- International Cooperation Base of Science and Technology Innovation on Forest Resource Biotechnology of Hunan Province, Central South University of Forestry and Technology, Changsha, China.,College of Food Science and Engineering, Central South University of Forestry and Technology, Changsha, China
| | - Xiao-Ling Wang
- International Cooperation Base of Science and Technology Innovation on Forest Resource Biotechnology of Hunan Province, Central South University of Forestry and Technology, Changsha, China
| | - Qinlu Lin
- International Cooperation Base of Science and Technology Innovation on Forest Resource Biotechnology of Hunan Province, Central South University of Forestry and Technology, Changsha, China.,College of Food Science and Engineering, Central South University of Forestry and Technology, Changsha, China
| | - Gao-Qiang Liu
- International Cooperation Base of Science and Technology Innovation on Forest Resource Biotechnology of Hunan Province, Central South University of Forestry and Technology, Changsha, China
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15
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Mochida A, Mita T, Azuma K, Osonoi Y, Masuyama A, Nakajima K, Goto H, Nishida Y, Miyatsuka T, Mitsumata M, Watada H. Defective autophagy in vascular smooth muscle cells enhances the healing of abdominal aortic aneurysm. Physiol Rep 2021; 9:e15000. [PMID: 34491001 PMCID: PMC8422599 DOI: 10.14814/phy2.15000] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 07/02/2021] [Accepted: 07/18/2021] [Indexed: 11/24/2022] Open
Abstract
Autophagy is an evolutionarily conserved cellular catabolic process essential for cell homeostasis, and thus its failure is associated with several diseases. While autophagy has been reported to play a role in vascular smooth muscle cells (SMCs) in vascular disorders, its precise role in the pathogenesis of abdominal aortic aneurysm (AAA) has not yet been elucidated. In this study, we investigated the role of SMC autophagy in AAA formation. As a mouse model of AAA, we used control apolipoprotein E-deficient (apoeKO) mice and Atg7cKO (SMC-specific Atg7-deficient mice):apoeKO mice administered angiotensin II for 4 weeks. Intriguingly, Kaplan-Meier curves showed that the survival rates of Atg7cKO:apoeKO mice were significantly higher than those of apoeKO mice. The hematoma area in AAA of Atg7cKO:apoeKO mice was smaller than in apoeKO mice despite the lack of a significant difference in AAA incidence between the two groups. Furthermore, the amount of granulomatous tissues was significantly larger and the collagen-positive area within AAA was significantly larger in Atg7cKO:apoeKO mice than in apoeKO mice. In accordance with these findings, SMCs cultured from Atg7cKO mice showed increased expression of collagens, independent of angiotensin II action. Taken together, our data suggest that defective autophagy in SMCs elicits AAA healing that may underlie the better survival rate under dyslipidemia and angiotensin II infusion.
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MESH Headings
- Angiotensin II/administration & dosage
- Angiotensin II/toxicity
- Animals
- Aortic Aneurysm, Abdominal/chemically induced
- Aortic Aneurysm, Abdominal/pathology
- Autophagy/drug effects
- Autophagy/physiology
- Cells, Cultured
- Infusion Pumps, Implantable
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Mice, Transgenic
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/pathology
- Myocytes, Smooth Muscle/drug effects
- Myocytes, Smooth Muscle/pathology
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Affiliation(s)
- Akihiro Mochida
- Department of Metabolism & EndocrinologyJuntendo University Graduate School of MedicineTokyoJapan
| | - Tomoya Mita
- Department of Metabolism & EndocrinologyJuntendo University Graduate School of MedicineTokyoJapan
- Center for Therapeutic Innovations in DiabetesJuntendo University Graduate School of MedicineTokyoJapan
- Center for Identification of Diabetic Therapeutic TargetsJuntendo University Graduate School of MedicineTokyoJapan
| | - Kosuke Azuma
- Department of Metabolism & EndocrinologyJuntendo University Graduate School of MedicineTokyoJapan
| | - Yusuke Osonoi
- Department of Metabolism & EndocrinologyJuntendo University Graduate School of MedicineTokyoJapan
| | - Atsushi Masuyama
- Department of Metabolism & EndocrinologyJuntendo University Graduate School of MedicineTokyoJapan
| | - Kenichi Nakajima
- Department of Metabolism & EndocrinologyJuntendo University Graduate School of MedicineTokyoJapan
| | - Hiromasa Goto
- Department of Metabolism & EndocrinologyJuntendo University Graduate School of MedicineTokyoJapan
| | - Yuya Nishida
- Department of Metabolism & EndocrinologyJuntendo University Graduate School of MedicineTokyoJapan
| | - Takeshi Miyatsuka
- Department of Metabolism & EndocrinologyJuntendo University Graduate School of MedicineTokyoJapan
| | - Masako Mitsumata
- Division of PathologyDepartment of Clinical LaboratoryYamanashi Kosei HospitalYamanashi cityYamanashiJapan
| | - Hirotaka Watada
- Department of Metabolism & EndocrinologyJuntendo University Graduate School of MedicineTokyoJapan
- Center for Therapeutic Innovations in DiabetesJuntendo University Graduate School of MedicineTokyoJapan
- Center for Identification of Diabetic Therapeutic TargetsJuntendo University Graduate School of MedicineTokyoJapan
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16
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Efentakis P, Molitor M, Kossmann S, Bochenek ML, Wild J, Lagrange J, Finger S, Jung R, Karbach S, Schäfer K, Schulz A, Wild P, Münzel T, Wenzel P. Tubulin-folding cofactor E deficiency promotes vascular dysfunction by increased endoplasmic reticulum stress. Eur Heart J 2021; 43:488-500. [PMID: 34132336 PMCID: PMC8830526 DOI: 10.1093/eurheartj/ehab222] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Revised: 10/29/2020] [Accepted: 03/26/2021] [Indexed: 12/14/2022] Open
Abstract
AIMS Assessment of endothelial function in humans by measuring flow-mediated dilation (FMD) risk-stratifies individuals with established cardiovascular disease, whereas its predictive value is limited in primary prevention. We therefore aimed to establish and evaluate novel markers of FMD at the population level. METHODS AND RESULTS In order to identify novel targets that were negatively correlated with FMD and investigate their contribution to vascular function, we performed a genome-wide association study (GWAS) of 4175 participants of the population based Gutenberg Health Study. Subsequently, conditional knockout mouse models deleting the gene of interest were generated and characterized. GWAS analysis revealed that single-nucleotide polymorphisms (SNPs) in the tubulin-folding cofactor E (TBCE) gene were negatively correlated with endothelial function and TBCE expression. Vascular smooth muscle cell (VSMC)-targeted TBCE deficiency was associated with endothelial dysfunction, aortic wall hypertrophy, and endoplasmic reticulum (ER) stress-mediated VSMC hyperproliferation in mice, paralleled by calnexin up-regulation and exacerbated by the blood pressure hormone angiotensin II. Treating SMMHC-ERT2-Cre+/-TBCEfl/fl mice with the ER stress modulator tauroursodeoxycholic acid amplified Raptor/Beclin-1-dependent autophagy and reversed vascular dysfunction. CONCLUSION TBCE and tubulin homeostasis seem to be novel predictors of vascular function and offer a new drug target to ameliorate ER stress-dependent vascular dysfunction.
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Affiliation(s)
- Panagiotis Efentakis
- Department of Cardiology, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany.,Center for Thrombosis and Hemostasis, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Michael Molitor
- Department of Cardiology, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany.,Center for Thrombosis and Hemostasis, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany.,German Center for Cardiovascular Research (DZHK)-Partner site Rhine-Main, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Sabine Kossmann
- Department of Cardiology, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany.,Center for Thrombosis and Hemostasis, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Magdalena L Bochenek
- Department of Cardiology, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany.,Center for Thrombosis and Hemostasis, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany.,German Center for Cardiovascular Research (DZHK)-Partner site Rhine-Main, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Johannes Wild
- Department of Cardiology, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany.,Center for Thrombosis and Hemostasis, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Jeremy Lagrange
- Department of Cardiology, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany.,Center for Thrombosis and Hemostasis, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Stefanie Finger
- Center for Thrombosis and Hemostasis, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Rebecca Jung
- Center for Thrombosis and Hemostasis, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Susanne Karbach
- Department of Cardiology, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany.,Center for Thrombosis and Hemostasis, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany.,German Center for Cardiovascular Research (DZHK)-Partner site Rhine-Main, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Katrin Schäfer
- Department of Cardiology, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany.,German Center for Cardiovascular Research (DZHK)-Partner site Rhine-Main, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Andreas Schulz
- Department of Cardiology-Preventive Cardiology and Medical Prevention, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Philipp Wild
- Center for Thrombosis and Hemostasis, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany.,German Center for Cardiovascular Research (DZHK)-Partner site Rhine-Main, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany.,Department of Cardiology-Preventive Cardiology and Medical Prevention, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Thomas Münzel
- Department of Cardiology, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany.,Center for Thrombosis and Hemostasis, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany.,German Center for Cardiovascular Research (DZHK)-Partner site Rhine-Main, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
| | - Philip Wenzel
- Department of Cardiology, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany.,Center for Thrombosis and Hemostasis, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany.,German Center for Cardiovascular Research (DZHK)-Partner site Rhine-Main, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
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17
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Gatica D, Chiong M, Lavandero S, Klionsky DJ. The role of autophagy in cardiovascular pathology. Cardiovasc Res 2021; 118:934-950. [PMID: 33956077 DOI: 10.1093/cvr/cvab158] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Accepted: 04/30/2021] [Indexed: 12/11/2022] Open
Abstract
Macroautophagy/autophagy is a conserved catabolic recycling pathway in which cytoplasmic components are sequestered, degraded, and recycled to survive various stress conditions. Autophagy dysregulation has been observed and linked with the development and progression of several pathologies, including cardiovascular diseases, the leading cause of death in the developed world. In this review, we aim to provide a broad understanding of the different molecular factors that govern autophagy regulation and how these mechanisms are involved in the development of specific cardiovascular pathologies, including ischemic and reperfusion injury, myocardial infarction, cardiac hypertrophy, cardiac remodeling, and heart failure.
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Affiliation(s)
- Damián Gatica
- Life Sciences Institute and Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI, USA
| | - Mario Chiong
- Advanced Center for Chronic Diseases (ACCDiS), Facultad de Ciencias Químicas y Farmacéuticas & Facultad de Medicina, Universidad de Chile, Santiago 8380492, Chile
| | - Sergio Lavandero
- Advanced Center for Chronic Diseases (ACCDiS), Facultad de Ciencias Químicas y Farmacéuticas & Facultad de Medicina, Universidad de Chile, Santiago 8380492, Chile.,Corporación Centro de Estudios Científicos de las Enfermedades Crónicas (CECEC), Santiago 7860201, Chile.,Department of Internal Medicine (Cardiology Division), University of Texas Southwestern Medical Center, Dallas, TX 75390-8573, USA
| | - Daniel J Klionsky
- Life Sciences Institute and Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI, USA
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18
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Smooth muscle-specific HuR knockout induces defective autophagy and atherosclerosis. Cell Death Dis 2021; 12:385. [PMID: 33837179 PMCID: PMC8035143 DOI: 10.1038/s41419-021-03671-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 03/19/2021] [Accepted: 03/23/2021] [Indexed: 01/19/2023]
Abstract
Human antigen R (HuR) is a widespread RNA-binding protein involved in homeostatic regulation and pathological processes in many diseases. Atherosclerosis is the leading cause of cardiovascular disease and acute cardiovascular events. However, the role of HuR in atherosclerosis remains unknown. In this study, mice with smooth muscle-specific HuR knockout (HuRSMKO) were generated to investigate the role of HuR in atherosclerosis. HuR expression was reduced in atherosclerotic plaques. As compared with controls, HuRSMKO mice showed increased plaque burden in the atherosclerotic model. Mechanically, HuR could bind to the mRNAs of adenosine 5′-monophosphate-activated protein kinase (AMPK) α1 and AMPKα2, thus increasing their stability and translation. HuR deficiency reduced p-AMPK and LC3II levels and increased p62 level, thereby resulting in defective autophagy. Finally, pharmacological AMPK activation induced autophagy and suppressed atherosclerosis in HuRSMKO mice. Our findings suggest that smooth muscle HuR has a protective effect against atherosclerosis by increasing AMPK-mediated autophagy.
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19
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Abstract
Cells respond to stress by activating a variety of defense signaling pathways, including cell survival and cell death pathways. Although cell survival signaling helps the cell to recover from acute insults, cell death or senescence pathways induced by chronic insults can lead to unresolved pathologies. Arterial hypertension results from chronic physiological maladaptation against various stressors represented by abnormal circulating or local neurohormonal factors, mechanical stress, intracellular accumulation of toxic molecules, and dysfunctional organelles. Hypertension and aging share common mechanisms that mediate or prolong chronic cell stress, such as endoplasmic reticulum stress and accumulation of protein aggregates, oxidative stress, metabolic mitochondrial stress, DNA damage, stress-induced senescence, and proinflammatory processes. This review discusses common adaptive signaling mechanisms against these stresses including unfolded protein responses, antioxidant response element signaling, autophagy, mitophagy, and mitochondrial fission/fusion, STING (signaling effector stimulator of interferon genes)-mediated responses, and activation of pattern recognition receptors. The main molecular mechanisms by which the vasculature copes with hypertensive and aging stressors are presented and recent advancements in stress-adaptive signaling mechanisms as well as potential therapeutic targets are discussed.
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Affiliation(s)
- Stephanie M. Cicalese
- These authors contributed equally and are considered co-first authors
- Cardiovascular Research Center, Lewis Katz School of Medicine at Temple University, Philadelphia, Pennsylvania, USA
| | - Josiane Fernandes da Silva
- These authors contributed equally and are considered co-first authors
- Department of Pharmacology, Ribeirao Preto Medical School, University of Sao Paulo, Ribeirao Preto, SP, Brazil
| | - Fernanda Priviero
- These authors contributed equally and are considered co-first authors
- Cardiovascular Translational Research Center and Department of Cell Biology and Anatomy, University of South Carolina, Columbia, South Carolina, USA
| | - R. Clinton Webb
- Cardiovascular Translational Research Center and Department of Cell Biology and Anatomy, University of South Carolina, Columbia, South Carolina, USA
| | - Satoru Eguchi
- Cardiovascular Research Center, Lewis Katz School of Medicine at Temple University, Philadelphia, Pennsylvania, USA
| | - Rita C. Tostes
- Department of Pharmacology, Ribeirao Preto Medical School, University of Sao Paulo, Ribeirao Preto, SP, Brazil
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20
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Wendt TS, Li YJ, Gonzales RJ. Ozanimod, an S1PR 1 ligand, attenuates hypoxia plus glucose deprivation-induced autophagic flux and phenotypic switching in human brain VSM cells. Am J Physiol Cell Physiol 2021; 320:C1055-C1073. [PMID: 33788630 DOI: 10.1152/ajpcell.00044.2021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Vascular smooth muscle (VSM) cell phenotypic expression and autophagic state are dynamic responses to stress. Vascular pathologies, such as hypoxemia and ischemic injury, induce a synthetic VSM phenotype and autophagic flux resulting in a loss of vascular integrity and VSM cell death respectfully. Both clinical pilot and experimental stroke studies demonstrate that sphingosine-1-phosphate receptor (S1PR) modulation improves stroke outcome; however, specific mechanisms associated with a beneficial outcome at the level of the cerebrovasculature have not been clearly elucidated. We hypothesized that ozanimod, a selective S1PR type 1 ligand, will attenuate VSM synthetic phenotypic expression and autophagic flux in primary human brain VSM cells following acute hypoxia plus glucose deprivation (HGD; in vitro ischemic-like injury) exposure. Cells were treated with ozanimod and exposed to normoxia or HGD. Crystal violet staining, standard immunoblotting, and immunocytochemical labeling techniques assessed cellular morphology, vacuolization, phenotype, and autophagic state. We observed that HGD temporally decreased VSM cell viability and concomitantly increased vacuolization, both of which ozanimod reversed. HGD induced a simultaneous elevation and reduction in levels of pro- and antiautophagic proteins respectfully, and ozanimod attenuated this response. Protein levels of VSM phenotypic biomarkers, smoothelin and SM22, were decreased following HGD. Furthermore, we observed an HGD-induced epithelioid and synthetic morphological appearance accompanied by disorganized cytoskeletal filaments, which was rescued by ozanimod. Thus, we conclude that ozanimod, a selective S1PR1 ligand, protects against acute HGD-induced phenotypic switching and promotes cell survival, in part, by attenuating HGD-induced autophagic flux thus improving vascular patency in response to acute ischemia-like injury.
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Affiliation(s)
- Trevor S Wendt
- Department of Basic Medical Sciences, University of Arizona College of Medicine, Phoenix, Arizona
| | - Yu Jing Li
- Department of Basic Medical Sciences, University of Arizona College of Medicine, Phoenix, Arizona
| | - Rayna J Gonzales
- Department of Basic Medical Sciences, University of Arizona College of Medicine, Phoenix, Arizona
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Liu G, Qi X, Li X, Sun F. Ginsenoside Rg2 protects cardiomyocytes against trastuzumab-induced toxicity by inducing autophagy. Exp Ther Med 2021; 21:473. [PMID: 33767768 PMCID: PMC7976377 DOI: 10.3892/etm.2021.9904] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 02/25/2020] [Indexed: 12/13/2022] Open
Abstract
Trastuzumab (TZM) significantly improves the outcomes of patients with breast cancer; however, it is associated with severe cardiotoxicity. Ginsenoside Rg2 was reported to exert protective effects against myocardial injury and apoptosis in human cardiomyocytes (HCMs). However, whether ginsenoside Rg2 protects HCMs against TZM-induced toxicity remains unclear. The present study investigated the proliferation of HCMs using a Cell Counting Kit-8 assay and Ki67 immunofluorescence staining. Apoptotic cells were detected by Annexin V/propidium iodide staining and flow cytometry. Furthermore, monodansylcadaverine staining was performed to detect cell autophagy. In addition, western blotting was used to detect the expression levels of phosphorylated (p)-Akt, p-mTOR, beclin 1, microtubule associated protein 1 light chain 3α (LC3) and autophagy protein 5 (ATG5) in HCMs. Pretreatment with ginsenoside Rg2 significantly protected HCMs against TZM-induced cytotoxicity by inhibiting apoptosis. Furthermore, pretreatment with ginsenoside Rg2 induced autophagy in HCMs by upregulating the expression levels of p-Akt, p-mTOR, beclin 1, LC3 and ATG5. The results obtained in the present study suggested that ginsenoside Rg2 could protect HCMs against TZM-induced cardiotoxicity by activating autophagy. Therefore, ginsenoside Rg2 may serve as a potential therapeutic agent to prevent TZM-related cardiotoxicity in patients with breast cancer.
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Affiliation(s)
- Guang Liu
- Department of Cardiovascular Medicine, Hebei Medical University, Shijiazhuang, Hebei 050000, P.R. China
| | - Xiaoyong Qi
- Department of Cardiovascular Medicine, Hebei General Hospital, Shijiazhuang, Hebei 050000, P.R. China
| | - Xingtao Li
- Department of Cardiovascular Medicine, The Fourth Affiliated Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, P.R. China
| | - Fangyi Sun
- Department of Cardiovascular Medicine, The Fourth Affiliated Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, P.R. China
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Sugawara H, Moniwa N, Kuno A, Ohwada W, Osanami A, Shibata S, Kimura Y, Abe K, Gocho Y, Tanno M, Miura T. Activation of the angiotensin II receptor promotes autophagy in renal proximal tubular cells and affords protection from ischemia/reperfusion injury. J Pharmacol Sci 2021; 145:187-197. [PMID: 33451753 DOI: 10.1016/j.jphs.2020.12.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 11/28/2020] [Accepted: 12/01/2020] [Indexed: 12/17/2022] Open
Abstract
Roles of the renin-angiotensin system in autophagy and ischemia/reperfusion (I/R) injury in the kidney have not been fully characterized. Here we examined the hypothesis that modest activation of the angiotensin II (Ang II) receptor upregulates autophagy and increases renal tolerance to I/R injury. Sprague-Dawley rats were assigned to treatment with a vehicle or a non-pressor dose of Ang II (200 ng/kg/min) for 72 h before 30-min renal I/R. LC3-immunohistochemistry showed that Ang II treatment increased autophagosomes in proximal tubular cells by 2.7 fold. In Ang II-pretreated rats, autophagosomes were increased by 2.5 fold compared to those in vehicle-treated rats at 4 h after I/R, when phosphorylation of Akt and S6 was suppressed and ULK1-Ser555 phosphorylation was increased. Serum creatinine and urea nitrogen levels, incidence of oliguria, and histological score of tubular necrosis at 24 h after I/R were attenuated by Ang II-pretreatment. In NRK-52E cells, Ang II induced LC3-II upregulation, which was inhibited by losartan but not by A779. The results indicate that a non-pressor dose of Ang-II promotes autophagy via ULK1-mediated signaling in renal tubular cells and attenuates renal I/R injury. The AT1 receptor, but not the Mas receptor, contributes to Ang-II-induced autophagy and presumably also to the renoprotection.
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Affiliation(s)
- Hirohito Sugawara
- Department of Cardiovascular, Renal and Metabolic Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Norihito Moniwa
- Department of Cardiovascular, Renal and Metabolic Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Atsushi Kuno
- Department of Cardiovascular, Renal and Metabolic Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan; Department of Pharmacology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Wataru Ohwada
- Department of Cardiovascular, Renal and Metabolic Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Arata Osanami
- Department of Cardiovascular, Renal and Metabolic Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Satoru Shibata
- Department of Cardiovascular, Renal and Metabolic Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Yukishige Kimura
- Department of Cardiovascular, Renal and Metabolic Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Koki Abe
- Department of Cardiovascular, Renal and Metabolic Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Yufu Gocho
- Department of Cardiovascular, Renal and Metabolic Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Masaya Tanno
- Department of Cardiovascular, Renal and Metabolic Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Tetsuji Miura
- Department of Cardiovascular, Renal and Metabolic Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan.
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Liu N, Xue Y, Tang J, Zhang M, Ren X, Fu J. The dynamic change of phenotypic markers of smooth muscle cells in an animal model of cerebral small vessel disease. Microvasc Res 2021; 133:104061. [PMID: 32827495 DOI: 10.1016/j.mvr.2020.104061] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 07/22/2020] [Accepted: 08/15/2020] [Indexed: 12/01/2022]
Abstract
BACKGROUND The pathological character of cerebral small vessel disease (CSVD) is the dysfunction of cerebral small arteries caused by risk factors. A switch from the contractile phenotype to the synthetic phenotype of vascular smooth muscle cells (SMCs) can decrease the contractility of arteries. The alteration of the vascular wall extracellular matrix (ECM) is found to regulate the process. We speculated that SMCs phenotype changes may also occur in CSVD induced by hypertension and the alteration of ECM especially fibronectin and laminin may regulate the process. METHOD Male spontaneously hypertensive rats (SHR) were used as a CSVD animal model. SMCs phenotypic markers and the ECM expression of the cerebral small arteries of SHR at different ages were evaluated by immunofluorescence. The phenotype changes of primary brain microvascular SMCs cultured on laminin-coating dish or fibronectin-coating dish were evaluated by western blot. RESULT A switch from the contractile phenotype to synthetic phenotype in SHR at 10 and 22 weeks of age was observed. Meanwhile, increased expression of fibronectin and a temporary decline of laminin was found in small arteries of SHR at 22 weeks. In vitro experiments also convinced that SMCs cultured on a fibronectin-coating dish failed to maintain contractile phenotype. While at 50 weeks, significant drops of both synthetic and contractile phenotypic markers were witnessed in SHR, with high expressions of four kinds of ECM. CONCLUSION SMCs in cerebral small arteries exhibited a switch from the contractile phenotype to synthetic phenotype during the chronic process of hypertension and aging. Moreover, the change of fibronectin and laminin may regulate the process.
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MESH Headings
- Age Factors
- Animals
- Biomarkers/metabolism
- Cells, Cultured
- Cerebral Arteries/metabolism
- Cerebral Arteries/pathology
- Cerebral Arteries/physiopathology
- Cerebral Small Vessel Diseases/etiology
- Cerebral Small Vessel Diseases/metabolism
- Cerebral Small Vessel Diseases/pathology
- Cerebral Small Vessel Diseases/physiopathology
- Disease Models, Animal
- Extracellular Matrix/metabolism
- Extracellular Matrix/pathology
- Fibronectins/metabolism
- Hypertension/complications
- Hypertension/metabolism
- Hypertension/physiopathology
- Laminin/metabolism
- Male
- Muscle, Smooth, Vascular/metabolism
- Muscle, Smooth, Vascular/pathology
- Muscle, Smooth, Vascular/physiopathology
- Myocytes, Smooth Muscle/metabolism
- Myocytes, Smooth Muscle/pathology
- Phenotype
- Rats, Inbred SHR
- Rats, Inbred WKY
- Vascular Remodeling
- Vasoconstriction
- Rats
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Affiliation(s)
- Na Liu
- Department of Neurology, Huashan Hospital, Fudan University, No.12 Wulumuqi Zhong Road, Shanghai 200040, China
| | - Yang Xue
- Department of Neurology, Huashan Hospital, Fudan University, No.12 Wulumuqi Zhong Road, Shanghai 200040, China
| | - Jie Tang
- Department of Neurology, Huashan Hospital, Fudan University, No.12 Wulumuqi Zhong Road, Shanghai 200040, China
| | - Miaoyi Zhang
- Department of Neurology, North Huashan hospital, Fudan University, No.108 Lu Xiang Road, Shanghai 201900, China
| | - Xue Ren
- Department of Neurology, Huashan Hospital, Fudan University, No.12 Wulumuqi Zhong Road, Shanghai 200040, China
| | - Jianhui Fu
- Department of Neurology, Huashan Hospital, Fudan University, No.12 Wulumuqi Zhong Road, Shanghai 200040, China; Department of Neurology, North Huashan hospital, Fudan University, No.108 Lu Xiang Road, Shanghai 201900, China.
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24
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Zheng A, Ma H, Liu X, Huang Q, Li Z, Wang L, Zeng N, Wu B. Effects of Moist Exposed Burn Therapy and Ointment (MEBT/MEBO) on the autophagy mTOR signalling pathway in diabetic ulcer wounds. PHARMACEUTICAL BIOLOGY 2020; 58:124-130. [PMID: 31967912 PMCID: PMC7006791 DOI: 10.1080/13880209.2019.1711430] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Revised: 12/17/2019] [Accepted: 12/30/2019] [Indexed: 06/10/2023]
Abstract
Context: Burn therapy (MEBT)/moist exposed burn ointment (MEBO) is an effective traditional Chinese medicine method to treat diabetic wound, but the mechanism is unclear. Autophagy has been proved to be closely related with wound healing, so MEBO/MEBT is hypothesized to promote diabetic wound healing by regulating autophagy.Objective: To explore the mechanism of moist exposed MEBT/MEBO promoting diabetic wound repair.Materials and methods: Eighty male Wistar rats were randomly assigned to control (n = 20) and diabetic group induced by intraperitoneal injection of STZ (n = 60), which were further randomly assigned to MEBO, Kangfuxin and model groups (n = 20 each). All rats underwent full-thickness skin resection in the back. Wound healing was dynamically observed and wound tissues were collected at five time points for pathological examination, autophagosome and the expression of PI3K, Akt and mTOR.Results: The healing time in the control group was the shortest, no statistically significant difference was found between the MEBO and the Kangfuxin group (p = 0.76). The morphology of autophagosomes ranged large to small, which was the most obvious in the MEBO group. The mRNA and protein expression of PI3K, Akt and mTOR in each group reached the peak on Day 5, the levels in the MEBO group were the highest (F = 18.43, 19.97, 15.36, p < 0.05). On Day 11, the expression levels in each group began to decline.Discussion and conclusions: In this study, we discussed the molecular mechanism of MEBT/MEBO promoting the repair of diabetic ulcer wounds through autophagy and PI3K-Akt-mTOR signalling pathway, which provides a new way for drug design in the future.
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Affiliation(s)
- Aitian Zheng
- Department of Endocrinology, The Affiliated Hospital of Youjiang Medical College for Nationalities, Baise, Guangxi, China
| | - Huadan Ma
- Department of Endocrinology, The Affiliated Hospital of Youjiang Medical College for Nationalities, Baise, Guangxi, China
| | - Xianbin Liu
- Department of Endocrinology, The Affiliated Hospital of Youjiang Medical College for Nationalities, Baise, Guangxi, China
| | - Qing Huang
- Department of Endocrinology, The Affiliated Hospital of Youjiang Medical College for Nationalities, Baise, Guangxi, China
| | - Zheng Li
- Department of Endocrinology, The Affiliated Hospital of Youjiang Medical College for Nationalities, Baise, Guangxi, China
| | - Lin Wang
- Department of Endocrinology, The Affiliated Hospital of Youjiang Medical College for Nationalities, Baise, Guangxi, China
| | - Na Zeng
- Department of Endocrinology, The Affiliated Hospital of Youjiang Medical College for Nationalities, Baise, Guangxi, China
| | - Biaoliang Wu
- Department of Endocrinology, The Affiliated Hospital of Youjiang Medical College for Nationalities, Baise, Guangxi, China
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25
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Wang W, Huang L, Thomas ER, Hu Y, Zeng F, Li X. Notoginsenoside R1 Protects Against the Acrylamide-Induced Neurotoxicity via Upregulating Trx-1-Mediated ITGAV Expression: Involvement of Autophagy. Front Pharmacol 2020; 11:559046. [PMID: 32982756 PMCID: PMC7493052 DOI: 10.3389/fphar.2020.559046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 08/17/2020] [Indexed: 01/07/2023] Open
Abstract
Acrylamide (ACR) is a common chemical used in various industries and it said to have chronic neurotoxic effects. It is produced during tobacco smoking and is also generated in high-starch foods during heat processing. Notoginsenoside R1 (NR1) is a traditional Chinese medicine, which is used to improve the blood circulation and clotting. The objective of this study was to investigate the mechanism of ACR-triggered neurotoxicity and to identify the protective role of NR1 by upregulating thioredoxin-1 (Trx-1). Our results have shown that NR1 could block the spatial and cognitive impairment caused by ACR administration. Bioinformatics analysis revealed that Trx-1 regulated autophagy via Integrin alpha V (ITGAV). NR1 could resist the ACR-induced neurotoxicity by upregulating thioredoxin-1 in PC12 cells and mice. The autophagy-related proteins like autophagy-related gene (ATG) 4B, Cathepsin D, LC3 II, lysosomal-associated membrane protein 2a (LAMP2a), and ITGAV were restored to normal levels by NR1 treatment in both PC12 cells and mice. Besides, we also found that overexpression of Trx-1 resisted ACR-induced autophagy in PC12 cells and downregulation of Trx-1 triggered autophagy induced by ACR in PC12 cells. Therefore, it could be concluded that Trx-1 was involved in the autophagy pathway. Besides, we also found that ITGAV was an intermediate node linking Trx-1 and the autophagy pathway.
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Affiliation(s)
- Wenjun Wang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Southwest Medical University, Luzhou, China.,Institute for Cancer Medicine and School of Basic Medical Sciences, Southwest Medical University, Luzhou, China
| | - Lu Huang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Southwest Medical University, Luzhou, China
| | | | - Yingying Hu
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Southwest Medical University, Luzhou, China
| | - Fancai Zeng
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Southwest Medical University, Luzhou, China
| | - Xiang Li
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Southwest Medical University, Luzhou, China
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26
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Ornatowski W, Lu Q, Yegambaram M, Garcia AE, Zemskov EA, Maltepe E, Fineman JR, Wang T, Black SM. Complex interplay between autophagy and oxidative stress in the development of pulmonary disease. Redox Biol 2020; 36:101679. [PMID: 32818797 PMCID: PMC7451718 DOI: 10.1016/j.redox.2020.101679] [Citation(s) in RCA: 184] [Impact Index Per Article: 46.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 07/20/2020] [Accepted: 08/04/2020] [Indexed: 12/16/2022] Open
Abstract
The autophagic pathway involves the encapsulation of substrates in double-membraned vesicles, which are subsequently delivered to the lysosome for enzymatic degradation and recycling of metabolic precursors. Autophagy is a major cellular defense against oxidative stress, or related conditions that cause accumulation of damaged proteins or organelles. Selective forms of autophagy can maintain organelle populations or remove aggregated proteins. Dysregulation of redox homeostasis under pathological conditions results in excessive generation of reactive oxygen species (ROS), leading to oxidative stress and the associated oxidative damage of cellular components. Accumulating evidence indicates that autophagy is necessary to maintain redox homeostasis. ROS activates autophagy, which facilitates cellular adaptation and diminishes oxidative damage by degrading and recycling intracellular damaged macromolecules and dysfunctional organelles. The cellular responses triggered by oxidative stress include the altered regulation of signaling pathways that culminate in the regulation of autophagy. Current research suggests a central role for autophagy as a mammalian oxidative stress response and its interrelationship to other stress defense systems. Altered autophagy phenotypes have been observed in lung diseases such as chronic obstructive lung disease, acute lung injury, cystic fibrosis, idiopathic pulmonary fibrosis, and pulmonary arterial hypertension, and asthma. Understanding the mechanisms by which ROS regulate autophagy will provide novel therapeutic targets for lung diseases. This review highlights our current understanding on the interplay between ROS and autophagy in the development of pulmonary disease.
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Affiliation(s)
- Wojciech Ornatowski
- Department of Medicine, The University of Arizona Health Sciences, Tucson, AZ, USA
| | - Qing Lu
- Department of Medicine, The University of Arizona Health Sciences, Tucson, AZ, USA
| | | | - Alejandro E Garcia
- Department of Medicine, The University of Arizona Health Sciences, Tucson, AZ, USA
| | - Evgeny A Zemskov
- Department of Medicine, The University of Arizona Health Sciences, Tucson, AZ, USA
| | - Emin Maltepe
- Department of Pediatrics, The University of California, San Francisco, San Francisco, CA, USA
| | - Jeffrey R Fineman
- Department of Pediatrics, The University of California, San Francisco, San Francisco, CA, USA; Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA, USA
| | - Ting Wang
- Department of Internal Medicine, The University of Arizona Health Sciences, Phoenix, AZ, USA
| | - Stephen M Black
- Department of Medicine, The University of Arizona Health Sciences, Tucson, AZ, USA.
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27
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Shadab M, Millar MW, Slavin SA, Leonard A, Fazal F, Rahman A. Autophagy protein ATG7 is a critical regulator of endothelial cell inflammation and permeability. Sci Rep 2020; 10:13708. [PMID: 32792588 PMCID: PMC7426828 DOI: 10.1038/s41598-020-70126-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2020] [Accepted: 07/14/2020] [Indexed: 12/19/2022] Open
Abstract
Endothelial cell (EC) inflammation and permeability are critical pathogenic mechanisms in many inflammatory conditions including acute lung injury. In this study, we investigated the role of ATG7, an essential autophagy regulator with no autophagy-unrelated functions, in the mechanism of EC inflammation and permeability. Knockdown of ATG7 using si-RNA significantly attenuated thrombin-induced expression of proinflammatory molecules such as IL-6, MCP-1, ICAM-1 and VCAM-1. Mechanistic study implicated reduced NF-κB activity in the inhibition of EC inflammation in ATG7-silenced cells. Moreover, depletion of ATG7 markedly reduced the binding of RelA/p65 to DNA in the nucleus. Surprisingly, the thrombin-induced degradation of IκBα in the cytosol was not affected in ATG7-depleted cells, suggesting a defect in the translocation of released RelA/p65 to the nucleus in these cells. This is likely due to suppression of thrombin-induced phosphorylation and thereby inactivation of Cofilin1, an actin-depolymerizing protein, in ATG7-depleted cells. Actin stress fiber dynamics are required for thrombin-induced translocation of RelA/p65 to the nucleus, and indeed our results showed that ATG7 silencing inhibited this response via inactivation of Cofilin1. ATG7 silencing also reduced thrombin-mediated EC permeability by inhibiting the disassembly of VE-cadherin at adherens junctions. Together, these data uncover a novel function of ATG7 in mediating EC inflammation and permeability, and provide a mechanistic basis for the linkage between autophagy and EC dysfunction.
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Affiliation(s)
- Mohammad Shadab
- Department of Pediatrics, Lung Biology and Disease Program, University of Rochester School of Medicine and Dentistry, 601 Elmwood Avenue, Box 850, Rochester, NY, 14642, USA
| | - Michelle Warren Millar
- Department of Pediatrics, Lung Biology and Disease Program, University of Rochester School of Medicine and Dentistry, 601 Elmwood Avenue, Box 850, Rochester, NY, 14642, USA
| | - Spencer A Slavin
- Department of Pediatrics, Lung Biology and Disease Program, University of Rochester School of Medicine and Dentistry, 601 Elmwood Avenue, Box 850, Rochester, NY, 14642, USA
| | - Antony Leonard
- Department of Pediatrics, Lung Biology and Disease Program, University of Rochester School of Medicine and Dentistry, 601 Elmwood Avenue, Box 850, Rochester, NY, 14642, USA
| | - Fabeha Fazal
- Department of Pediatrics, Lung Biology and Disease Program, University of Rochester School of Medicine and Dentistry, 601 Elmwood Avenue, Box 850, Rochester, NY, 14642, USA
| | - Arshad Rahman
- Department of Pediatrics, Lung Biology and Disease Program, University of Rochester School of Medicine and Dentistry, 601 Elmwood Avenue, Box 850, Rochester, NY, 14642, USA.
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28
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Investigating the Vascular Toxicity Outcomes of the Irreversible Proteasome Inhibitor Carfilzomib. Int J Mol Sci 2020; 21:ijms21155185. [PMID: 32707866 PMCID: PMC7432349 DOI: 10.3390/ijms21155185] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 07/14/2020] [Accepted: 07/20/2020] [Indexed: 12/19/2022] Open
Abstract
Background: Carfilzomib’s (Cfz) adverse events in myeloma patients include cardiovascular toxicity. Since carfilzomib’s vascular effects are elusive, we investigated the vascular outcomes of carfilzomib and metformin (Met) coadministration. Methods: Mice received: (i) saline; (ii) Cfz; (iii) Met; (iv) Cfz+Met for two consecutive (acute) or six alternate days (subacute protocol). Leucocyte-derived reactive oxygen species (ROS) and serum NOx levels were determined and aortas underwent vascular and molecular analyses. Mechanistic experiments were recapitulated in aged mice who received similar treatment to young animals. Primary murine (prmVSMCs) and aged human aortic smooth muscle cells (HAoSMCs) underwent Cfz, Met and Cfz+Met treatment and viability, metabolic flux and p53-LC3-B expression were measured. Experiments were recapitulated in AngII, CoCl2 and high-glucose stimulated HAoSMCs. Results: Acutely, carfilzomib alone led to vascular hypo-contraction and increased ROS release. Subacutely, carfilzomib increased ROS release without vascular manifestations. Cfz+Met increased PGF2α-vasoconstriction and LC3-B-dependent autophagy in both young and aged mice. In vitro, Cfz+Met led to cytotoxicity and autophagy, while Met and Cfz+Met shifted cellular metabolism. Conclusion: Carfilzomib induces a transient vascular impairment and oxidative burst. Cfz+Met increased vascular contractility and synergistically induced autophagy in all settings. Therefore, carfilzomib cannot be accredited for a permanent vascular dysfunction, while Cfz+Met exert vasoprotective potency.
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29
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Mocayar Marón FJ, Ferder L, Reiter RJ, Manucha W. Daily and seasonal mitochondrial protection: Unraveling common possible mechanisms involving vitamin D and melatonin. J Steroid Biochem Mol Biol 2020; 199:105595. [PMID: 31954766 DOI: 10.1016/j.jsbmb.2020.105595] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 01/09/2020] [Accepted: 01/16/2020] [Indexed: 12/11/2022]
Abstract
From an evolutionary point of view, vitamin D and melatonin appeared very early and share functions related to defense mechanisms. In the current clinical setting, vitamin D is exclusively associated with phosphocalcic metabolism. Meanwhile, melatonin has chronobiological effects and influences the sleep-wake cycle. Scientific evidence, however, has identified new actions of both molecules in different physiological and pathological settings. The biosynthetic pathways of vitamin D and melatonin are inversely related relative to sun exposure. A deficiency of these molecules has been associated with the pathogenesis of cardiovascular diseases, including arterial hypertension, neurodegenerative diseases, sleep disorders, kidney diseases, cancer, psychiatric disorders, bone diseases, metabolic syndrome, and diabetes, among others. During aging, the intake and cutaneous synthesis of vitamin D, as well as the endogenous synthesis of melatonin are remarkably depleted, therefore, producing a state characterized by an increase of oxidative stress, inflammation, and mitochondrial dysfunction. Both molecules are involved in the homeostatic functioning of the mitochondria. Given the presence of specific receptors in the organelle, the antagonism of the renin-angiotensin-aldosterone system (RAAS), the decrease of reactive species of oxygen (ROS), in conjunction with modifications in autophagy and apoptosis, anti-inflammatory properties inter alia, mitochondria emerge as the final common target for melatonin and vitamin D. The primary purpose of this review is to elucidate the common molecular mechanisms by which vitamin D and melatonin might share a synergistic effect in the protection of proper mitochondrial functioning.
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Affiliation(s)
- Feres José Mocayar Marón
- Área de Farmacología, Departamento de Patología, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Argentina; Instituto de Medicina y Biología Experimental de Cuyo (IMBECU), Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Mendoza, Argentina
| | - León Ferder
- Department of Pediatrics, Nephrology Division, Miller School of Medicine, University of Miami, FL, USA
| | - Russel J Reiter
- Department of Cellular and Structural Biology, University of Texas Health Science at San Antonio, San Antonio, TX, USA
| | - Walter Manucha
- Área de Farmacología, Departamento de Patología, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Argentina; Instituto de Medicina y Biología Experimental de Cuyo (IMBECU), Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Mendoza, Argentina.
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30
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Abstract
The active hormone of the renin-angiotensin system (RAS), angiotensin II (Ang II), is involved in several human diseases, driving the development and clinical use of several therapeutic drugs, mostly angiotensin I converting enzyme (ACE) inhibitors and angiotensin receptor type I (AT1R) antagonists. However, angiotensin peptides can also bind to receptors different from AT1R, in particular, angiotensin receptor type II (AT2R), resulting in biological and physiological effects different, and sometimes antagonistic, of their binding to AT1R. In the present Perspective, the components of the RAS and the therapeutic tools developed to control it will be reviewed. In particular, the characteristics of AT2R and tools to modulate its functions will be discussed. Agonists or antagonists to AT2R are potential therapeutics in cardiovascular diseases, for agonists, and in the control of pain, for antagonists, respectively. However, controlling their binding properties and their targeting to the target tissues must be optimized.
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Affiliation(s)
- Lucienne Juillerat-Jeanneret
- Transplantation Center, Department of Medicine, Centre Hospitalier Universitaire Vaudois (CHUV) and University of Lausanne (UNIL), Chemin des Boveresses 155, CH1011 Lausanne, Switzerland
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31
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De Munck DG, De Meyer GR, Martinet W. Autophagy as an emerging therapeutic target for age-related vascular pathologies. Expert Opin Ther Targets 2020; 24:131-145. [PMID: 31985292 DOI: 10.1080/14728222.2020.1723079] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Introduction: The incidence of age-related vascular diseases such as arterial stiffness, hypertension and atherosclerosis, is rising dramatically and is substantially impacting healthcare systems. Mounting evidence suggests that there is an important role for autophagy in maintaining (cardio)vascular health. Impaired vascular autophagy has been linked to arterial aging and the initiation of vascular disease.Areas covered: The function and implications of autophagy in vascular smooth muscle cells and endothelial cells are discussed in healthy blood vessels and arterial disease. Furthermore, we discuss current treatment options for vascular disease and their links with autophagy. A literature search was conducted in PubMed up to October 2019.Expert opinion: Although the therapeutic potential of inducing autophagy in age-related vascular pathologies is considerable, several issues should be addressed before autophagy induction can be clinically used to treat vascular disease. These issues include uncertainty regarding the most effective drug target as well as the lack of potency and selectivity of autophagy inducing drugs. Moreover, drug tolerance or autophagy mediated cell death have been reported as possible adverse effects. Special attention is required for determining the cause of autophagy deficiency to optimize the treatment strategy.
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Affiliation(s)
- Dorien G De Munck
- Laboratory of Physiopharmacology, University of Antwerp, Antwerp, Belgium
| | - Guido Ry De Meyer
- Laboratory of Physiopharmacology, University of Antwerp, Antwerp, Belgium
| | - Wim Martinet
- Laboratory of Physiopharmacology, University of Antwerp, Antwerp, Belgium
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32
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Svarcbahs R, Jäntti M, Kilpeläinen T, Julku UH, Urvas L, Kivioja S, Norrbacka S, Myöhänen TT. Prolyl oligopeptidase inhibition activates autophagy via protein phosphatase 2A. Pharmacol Res 2019; 151:104558. [PMID: 31759088 DOI: 10.1016/j.phrs.2019.104558] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 11/02/2019] [Accepted: 11/19/2019] [Indexed: 02/06/2023]
Abstract
Prolyl oligopeptidase (PREP) is a serine protease that has been studied particularly in the context of neurodegenerative diseases for decades but its physiological function has remained unclear. We have previously found that PREP negatively regulates beclin1-mediated macroautophagy (autophagy), and that PREP inhibition by a small-molecule inhibitor induces clearance of protein aggregates in Parkinson's disease models. Since autophagy induction has been suggested as a potential therapy for several diseases, we wanted to further characterize how PREP regulates autophagy. We measured the levels of various kinases and proteins regulating beclin1-autophagy in HEK-293 and SH-SY5Y cell cultures after PREP inhibition, PREP deletion, and PREP overexpression and restoration, and verified the results in vivo by using PREP knock-out and wild-type mouse tissue where PREP was restored or overexpressed, respectively. We found that PREP regulates autophagy by interacting with protein phosphatase 2A (PP2A) and its endogenous inhibitor, protein phosphatase methylesterase 1 (PME1), and activator (protein phosphatase 2 phosphatase activator, PTPA), thus adjusting its activity and the levels of PP2A in the intracellular pool. PREP inhibition and deletion increased PP2A activity, leading to activation of death-associated protein kinase 1 (DAPK1), beclin1 phosphorylation and induced autophagy while PREP overexpression reduced this. Lowered activity of PP2A is connected to several neurodegenerative disorders and cancers, and PP2A activators would have enormous potential as drug therapy but development of such compounds has been a challenge. The concept of PREP inhibition has been proved safe, and therefore, our study supports the further development of PREP inhibitors as PP2A activators.
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Affiliation(s)
- Reinis Svarcbahs
- Division of Pharmacology and Pharmacotherapy/Drug Research Program, Faculty of Pharmacy, University of Helsinki, Finland
| | - Maria Jäntti
- Division of Pharmacology and Pharmacotherapy/Drug Research Program, Faculty of Pharmacy, University of Helsinki, Finland
| | - Tommi Kilpeläinen
- Division of Pharmacology and Pharmacotherapy/Drug Research Program, Faculty of Pharmacy, University of Helsinki, Finland
| | - Ulrika H Julku
- Division of Pharmacology and Pharmacotherapy/Drug Research Program, Faculty of Pharmacy, University of Helsinki, Finland
| | - Lauri Urvas
- Division of Pharmacology and Pharmacotherapy/Drug Research Program, Faculty of Pharmacy, University of Helsinki, Finland
| | - Saara Kivioja
- Division of Pharmacology and Pharmacotherapy/Drug Research Program, Faculty of Pharmacy, University of Helsinki, Finland
| | - Susanna Norrbacka
- Division of Pharmacology and Pharmacotherapy/Drug Research Program, Faculty of Pharmacy, University of Helsinki, Finland
| | - Timo T Myöhänen
- Division of Pharmacology and Pharmacotherapy/Drug Research Program, Faculty of Pharmacy, University of Helsinki, Finland.
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