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Jung WH, Kim JL. Retinal Capillary Network in Fellow Eyes with Unilateral Vein Occlusion Using Optical Coherence Tomography Angiography. JOURNAL OF THE KOREAN OPHTHALMOLOGICAL SOCIETY 2020. [DOI: 10.3341/jkos.2020.61.6.610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Ban TH, Kim EN, Kim MY, Lim JH, Lee JH, Kim HD, Yoon HE, Park CW, Choi BS. Renoprotective Effect of a Dipeptidyl Peptidase-4 Inhibitor on Aging Mice. Aging Dis 2020; 11:588-602. [PMID: 32489704 PMCID: PMC7220286 DOI: 10.14336/ad.2019.0620] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Accepted: 06/20/2019] [Indexed: 12/13/2022] Open
Abstract
Dipeptidyl peptidase 4 (DPP-4) inhibitors exert pleiotropic effects beyond glycemic control. We investigated the renoprotective effects of DPP-4 inhibitors on aging mice mediated by the renin-angiotensin system (RAS). C57BL/6 mice were divided into three groups: the two-month-old mice (YM group), the eighteen-month-old mice (AM group) and the eighteen-month-old, linagliptin-treated mice (AM + LIN group). Renal function was improved, based on serum creatinine and cystatin-C levels (p < 0.05 compared with the AM group for both parameters). Fibrotic areas and the levels of proteins related to fibrosis improved in the AM + LIN group (p < 0.001 compared with the AM group for all parameters). In the AM + LIN group, the DPP-4-positive area and activity and expressions of DPP-4 were decreased (p < 0.05 compared with the AM group for all parameters). The levels of proteins related to the RAS, including prorenin receptor, angiotensin-converting enzyme, angiotensin II and angiotensin 1 receptor, were decreased in the AM + LIN group (p < 0.05, p < 0.01, p < 0.05, and p < 0.01 compared with the AM group, respectively). NADPH oxidase 2 and NADPH oxidase 4 levels decreased in the AM + LIN group (p < 0.001 compared with the AM group for both proteins), whereas the levels of endothelial nitric oxide synthase (eNOS) phosphorylated at serine1177 and superoxide dismutase 1 were increased (p < 0.01 compared with the AM group for both proteins). DPP-4 inhibitors may exert renoprotective effects via prorenin receptor/angiotensin-converting enzyme/angiotensin II/angiotensin 1 receptor axis.
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Affiliation(s)
- Tae H Ban
- Division of Nephrology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Eun N Kim
- Division of Nephrology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Min Y Kim
- Division of Nephrology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Ji H Lim
- Division of Nephrology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Jong H Lee
- Division of Nephrology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Hyung D Kim
- Division of Nephrology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Hye E Yoon
- Division of Nephrology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Cheol W Park
- Division of Nephrology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Bum S Choi
- Division of Nephrology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
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Hao JS, Zhu CJ, Yan BY, Yan CY, Ling R. Stimulation of KLF14/PLK1 pathway by thrombin signaling potentiates endothelial dysfunction in Type 2 diabetes mellitus. Biomed Pharmacother 2018; 99:859-866. [PMID: 29710485 DOI: 10.1016/j.biopha.2018.01.151] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Revised: 01/25/2018] [Accepted: 01/29/2018] [Indexed: 12/11/2022] Open
Abstract
Type 2 diabetes mellitus (T2DM) promotes a high oxidative stress and hypercoagulable state that drives microvascular injury and multiple-organ abnormality. Elevated thrombin activity underlies T2DM-linked endothelial dysfunction, but the mechanistic links between T2DM/oxidative stress axis and thrombin-associated endothelial pathologies are incompletely understood. In this work, immunohistochemical studies and quantitative analysis using isolated endothelial cells (ECs) identified accumulated Kru¨ppel-like family of transcription factor 14 (KLF14) deposits in ECs from multiple organs as distinct features of T2DM mice. KLF14 upregulation in ECs, which was stimulated by thrombin treatment, was dependent on multiple pathways including calcium mobilization, activation of PKC and AMPK pathways. Functionally, inhibition of endogenous KLF14 expression significantly attenuated thrombin-induced endotheliocyte proliferation, endothelial cell migration and oxidative stress. Molecularly, by directly binding the promoter, KLF14 functions as a transcriptional activator of PLK1, a polo-like kinase whose overexpression induced excessive reactive oxygen species (ROS) production. Transient knockdown of PLK1 was sufficient to suppress KLF14 overexpression-potentiated endothelial dysfunction. Collectively, these data provide proof of concept that deregulation of KLF14/PLK1 cascade plays a key role in thrombin-induced endothelial dysfunction and targeting KLF14 or PLK1 may limit thrombin-associated pathologies in T2DM patients.
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Affiliation(s)
- Jun-Sheng Hao
- Department of Thyroid Gland and Breast Vascular Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, PR China
| | - Chao-Juan Zhu
- Department of Emergency Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, PR China
| | - Bin-Yuan Yan
- Department of Epidemiology, School of Public Health, Fourth Military Medical University, Xi'an 710032, PR China
| | - Chang-You Yan
- Family Planning Service Stations of Health and Family Planning Commission of Chengcheng County, Weinan City 714000, PR China.
| | - Rui Ling
- Department of Thyroid Gland and Breast Vascular Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, PR China.
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Kim EN, Kim MY, Lim JH, Kim Y, Shin SJ, Park CW, Kim YS, Chang YS, Yoon HE, Choi BS. The protective effect of resveratrol on vascular aging by modulation of the renin-angiotensin system. Atherosclerosis 2018; 270:123-131. [PMID: 29407880 DOI: 10.1016/j.atherosclerosis.2018.01.043] [Citation(s) in RCA: 91] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Revised: 12/18/2017] [Accepted: 01/24/2018] [Indexed: 12/21/2022]
Abstract
BACKGROUND AND AIMS This study evaluated the effects of resveratrol on arterial aging and the renin-angiotensin system (RAS) in mice and vascular smooth muscle cells (VSMCs). METHODS Aging mice were divided into control and resveratrol groups. Histological changes, inflammation, oxidative stress, RAS components, and the expression of AMP-activated protein kinase (AMPK), silent information regulator T1 (SIRT1), peroxisome proliferator-activated receptor-γ co-activator 1α (PGC-1α), and anti-oxidative enzymes was measured in thoracic aortas of 24-month-old mice. The effect of resveratrol on fibrosis, cell senescence, and RAS components was also investigated in VSMCs stimulated by angiotensin (Ang) II. RESULTS Aorta media thickness, inflammation, fibrosis, and oxidative stress were significantly lower in the resveratrol group than in the control group. Resveratrol treatment decreased serum Ang II level and the aortic expression of prorenin receptor (PRR) and angiotensin converting enzyme (ACE), and increased serum Ang-(1-7) level and the expression of ACE2, Ang II type 2 receptor (AT2R), and Mas receptor (MasR). Resveratrol increased the expression of phosphorylated AMPK, SIRT1, PGC-1α, phosphorylated endothelial nitric oxide synthase and superoxide dismutase 1 and 2, and decreased that of NADPH oxidase 2 and 4. In Ang II-stimulated VSMCs, resveratrol treatment markedly decreased the number of senescence associated β-galactosidase stained cells and pro-fibrotic protein expression and increased the expression of AT2R and MasR. CONCLUSIONS Resveratrol protects against arterial aging and this effect is associated with reduced activity of the PRR-ACE-Ang II axis and stimulation of the ACE2-Ang-(1-7)-ATR2-MasR axis.
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MESH Headings
- AMP-Activated Protein Kinases/metabolism
- Age Factors
- Aging
- Animals
- Anti-Inflammatory Agents/pharmacology
- Antioxidants/pharmacology
- Aorta, Thoracic/drug effects
- Aorta, Thoracic/metabolism
- Aorta, Thoracic/pathology
- Cells, Cultured
- Cellular Senescence/drug effects
- Fibrosis
- Gene Expression Regulation
- Male
- Mice, Inbred C57BL
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Muscle, Smooth, Vascular/pathology
- Myocytes, Smooth Muscle/drug effects
- Myocytes, Smooth Muscle/metabolism
- Myocytes, Smooth Muscle/pathology
- Oxidative Stress/drug effects
- PPAR alpha/metabolism
- Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha/metabolism
- Renin-Angiotensin System/drug effects
- Renin-Angiotensin System/genetics
- Resveratrol/pharmacology
- Signal Transduction/drug effects
- Sirtuin 1/metabolism
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Affiliation(s)
- Eun Nim Kim
- Division of Nephrology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Republic of Korea
| | - Min Young Kim
- Division of Nephrology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Republic of Korea
| | - Ji Hee Lim
- Division of Nephrology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Republic of Korea
| | - Yaeni Kim
- Division of Nephrology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Republic of Korea; Department of Internal Medicine, Incheon St. Mary's Hospital, Incheon, Republic of Korea
| | - Seok Joon Shin
- Division of Nephrology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Republic of Korea; Department of Internal Medicine, Incheon St. Mary's Hospital, Incheon, Republic of Korea
| | - Cheol Whee Park
- Division of Nephrology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Republic of Korea; Department of Internal Medicine, Seoul St. Mary's Hospital, Seoul, Republic of Korea
| | - Yong-Soo Kim
- Division of Nephrology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Republic of Korea; Department of Internal Medicine, Seoul St. Mary's Hospital, Seoul, Republic of Korea
| | - Yoon Sik Chang
- Division of Nephrology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Republic of Korea; Department of Internal Medicine, Yeouido St. Mary's Hospital, Seoul, Republic of Korea
| | - Hye Eun Yoon
- Division of Nephrology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Republic of Korea; Department of Internal Medicine, Incheon St. Mary's Hospital, Incheon, Republic of Korea.
| | - Bum Soon Choi
- Division of Nephrology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Republic of Korea; Department of Internal Medicine, Seoul St. Mary's Hospital, Seoul, Republic of Korea.
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The Antioxidant Machinery of Young and Senescent Human Umbilical Vein Endothelial Cells and Their Microvesicles. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017. [PMID: 28642812 PMCID: PMC5470024 DOI: 10.1155/2017/7094781] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
We examine the antioxidant role of young and senescent human umbilical vein endothelial cells (HUVECs) and their microvesicles (MVs). Proteomic and Western blot studies have shown young HUVECs to have a complete and well-developed antioxidant system. Their MVs also contain antioxidant molecules, though of a smaller and more specific range, specialized in the degradation of hydrogen peroxide and the superoxide anion via the thioredoxin-peroxiredoxin system. Senescence was shown to be associated with a large increase in the size of the antioxidant machinery in both HUVECs and their MVs. These responses might help HUVECs and their MVs deal with the more oxidising conditions found in older cells. Functional analysis confirmed the antioxidant machinery of the MVs to be active and to increase in size with senescence. No glutathione or nonpeptide antioxidant (ascorbic acid and vitamin E) activity was detected in the MVs. Endothelial cells and MVs seem to adapt to higher ROS concentrations in senescence by increasing their antioxidant machinery, although this is not enough to recover completely from the senescence-induced ROS increase. Moreover, MVs could be involved in the regulation of the blood plasma redox status by functioning as ROS scavengers.
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FELLOW EYE CHANGES IN PATIENTS WITH NONISCHEMIC CENTRAL RETINAL VEIN OCCLUSION: Assessment of Perfused Foveal Microvascular Density and Identification of Nonperfused Capillaries. Retina 2016; 35:2028-36. [PMID: 25932560 DOI: 10.1097/iae.0000000000000586] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
PURPOSE Eyes fellow to nonischemic central retinal vein occlusion (CRVO) were examined for abnormalities, which might explain their increased risk for future occlusion, using adaptive optics scanning light ophthalmoscope fluorescein angiography. METHODS Adaptive optics scanning light ophthalmoscope fluorescein angiography foveal microvascular densities were calculated. Nonperfused capillaries adjacent to the foveal avascular zone were identified. Spectral domain optical coherence tomography, ultrawide field fluorescein angiographies, and microperimetry were also performed. RESULTS Ten fellow eyes of nine nonischemic CRVO and 1 nonischemic hemi-CRVO subjects and four affected eyes of three nonischemic CRVO and one nonischemic hemi-CRVO subjects were imaged. Ninety percent of fellow eyes and 100% of affected eyes demonstrated at least 1 nonperfused capillary compared with 31% of healthy eyes. Fellow eye microvascular density (35 ± 3.6 mm(-1)) was significantly higher than that of affected eyes (25 ± 5.2 mm(-1)) and significantly lower than that of healthy eyes (42 ± 4.2 mm(-1)). Compared with healthy controls, spectral domain optical coherence tomography thicknesses showed no significant difference, whereas microperimetry and 2/9 ultrawide field fluorescein angiography revealed abnormalities in fellow eyes. CONCLUSION Fellow eye changes detectable on adaptive optics scanning light ophthalmoscope fluorescein angiography reflect subclinical pathology difficult to detect using conventional imaging technologies. These changes may help elucidate the pathogenesis of nonischemic CRVO and help identify eyes at increased risk of future occlusion.
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Age-Associated Changes in the Vascular Renin-Angiotensin System in Mice. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2016; 2016:6731093. [PMID: 27200147 PMCID: PMC4855022 DOI: 10.1155/2016/6731093] [Citation(s) in RCA: 96] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Revised: 03/08/2016] [Accepted: 03/31/2016] [Indexed: 11/25/2022]
Abstract
Background. This study evaluated whether the change in the renin-angiotensin system (RAS) is associated with arterial aging in mice. Methods. Histologic changes and expressions of transforming growth factor-β (TGF-β), collagen IV, fibronectin, angiotensin II (Ang II), angiotensin-converting enzyme (ACE), angiotensin-converting enzyme 2 (ACE2), angiotensin II type 1 receptor (AT1R), angiotensin II type 2 receptor (AT2R), prorenin receptor (PRR), Mas receptor (MasR), endothelial nitric oxide synthase (eNOS), NADPH oxidase 2 and oxidase 4 (Nox2 and Nox4), 8-hydroxy-2′-deoxyguanosine (8-OHdG), 3-nitrotyrosine, and superoxide dismutase 1 and dismutase 2 (SOD1 and SOD2) were measured in the thoracic aortas from 2-month-old, 12-month-old, and 24-month-old C57/BL6 mice. Results. Twenty-four-month-old mice showed significantly increased aortic media thickness and expressions of TGF-β, collagen IV, and fibronectin, compared to 2-month-old and 12-month-old mice. The expressions of PRR, ACE, and Ang II, and AT1R-positive area significantly increased, whereas expressions of ACE2 and MasR and AT2R-positive area decreased with age. The expressions of phosphorylated serine1177-eNOS, SOD1, and SOD2 decreased, and the 8-OHdG-positive area and the 3-nitrotyrosine-positive area increased with age. The expression of Nox2 significantly increased with age, but that of Nox4 did not change. Conclusions. The enhanced PRR-ACE-Ang II-AT1R axis and reduced ACE2-MasR axis were associated with arterial aging in mice.
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Aging-related changes in oxidative stress response of human endothelial cells. Aging Clin Exp Res 2015; 27:547-53. [PMID: 25835220 DOI: 10.1007/s40520-015-0357-9] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Accepted: 03/23/2015] [Indexed: 12/20/2022]
Abstract
BACKGROUND Oxidative stress is strongly associated with aging and age-related diseases and plays a crucial role in endothelial dysfunction development. AIM To better understand the molecular mechanisms of aging and stress response in humans, we examined changes to young and older human endothelial cells over time (72, 96 and 120 h), before and after H2O2-induced stress. METHODS We measured the expression of the deacetylase Sirtuin 1 (Sirt1) and its transcriptional target Forkhead box O3a (Foxo3a); TBARS, a well-known marker of overall oxidative stress, and catalase activity as index of antioxidation. Moreover, we quantified levels of cellular senescence by senescence-associated β galactosidase (SA-βgal) assay. RESULTS Under oxidative stress induction older cells showed a progressive decrease of Sirt1 and Foxo3a expression, persistently high TBARS levels with high, but ineffective Cat activity to counteract such levels. In addition cellular senescence drastically increased in older cells compared with Young cells both in presence and in the absence of oxidative stress. DISCUSSION By following the cell behavior during the time course, we can hypothesize that while in young cells an oxidative stress induction stimulated an adequate response through activation of molecular factor crucial to counteract oxidative stress, the older cells are not able to adequately adapt themselves to external stress stimuli. CONCLUSIONS During their life, endothelial cells impair the ability to defend themselves from oxidative stress stimuli. This dysfunction involves the pathway of Sirt1 a critical regulator of oxidative stress response and cellular lifespan, underlining its crucial role in endothelial homeostasis control during aging and age-associated diseases.
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Abstract
The incidence of stroke and myocardial infarction increases in aged patients and it is associated with an adverse outcome. Considering the aging population and the increasing incidence of cardiovascular disease, the prediction for population well-being and health economics is daunting. Accordingly, there is an unmet need to focus on fundamental processes underlying vascular aging. A better understanding of the pathways leading to arterial aging may contribute to design mechanism-based therapeutic approaches to prevent or attenuate features of vascular senescence. In the present review, we discuss advances in the pathophysiology of age-related vascular dysfunction including nitric oxide signalling, dysregulation of oxidant/inflammatory genes, epigenetic modifications and mechanisms of vascular calcification as well as insights into vascular repair. Such an overview highlights attractive molecular targets for the prevention of age-driven vascular disease.
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Stolzing A, Haendeler J. Aging—mechanisms, models, and translation. Z Gerontol Geriatr 2013; 46:612. [DOI: 10.1007/s00391-013-0528-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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