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Islam MT, Cai J, Allen S, Moreno DG, Bloom SI, Bramwell RC, Mitton J, Horn AG, Zhu W, Donato AJ, Holland WL, Lesniewski LA. Endothelial-Specific Reduction in Arf6 Impairs Insulin-Stimulated Vasodilation and Skeletal Muscle Blood Flow Resulting in Systemic Insulin Resistance in Mice. Arterioscler Thromb Vasc Biol 2024; 44:1101-1113. [PMID: 38545783 DOI: 10.1161/atvbaha.123.319375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Accepted: 02/27/2024] [Indexed: 04/09/2024]
Abstract
BACKGROUND Much of what we know about insulin resistance is based on studies from metabolically active tissues such as the liver, adipose tissue, and skeletal muscle. Emerging evidence suggests that the vascular endothelium plays a crucial role in systemic insulin resistance; however, the underlying mechanisms remain incompletely understood. Arf6 (ADP ribosylation factor 6) is a small GTPase that plays a critical role in endothelial cell function. Here, we tested the hypothesis that the deletion of endothelial Arf6 will result in systemic insulin resistance. METHODS We used mouse models of constitutive endothelial cell-specific Arf6 deletion (Arf6f/- Tie2Cre+) and tamoxifen-inducible Arf6 knockout (Arf6f/f Cdh5CreER+). Endothelium-dependent vasodilation was assessed using pressure myography. Metabolic function was assessed using a battery of metabolic assessments including glucose and insulin tolerance tests and hyperinsulinemic-euglycemic clamps. We used a fluorescence microsphere-based technique to measure tissue blood flow. Skeletal muscle capillary density was assessed using intravital microscopy. RESULTS Endothelial Arf6 deletion impaired insulin-stimulated vasodilation in white adipose tissue and skeletal muscle feed arteries. The impairment in vasodilation was primarily due to attenuated insulin-stimulated nitric oxide bioavailability but independent of altered acetylcholine-mediated or sodium nitroprusside-mediated vasodilation. Endothelial cell-specific deletion of Arf6 also resulted in systematic insulin resistance in normal chow-fed mice and glucose intolerance in high-fat diet-fed obese mice. The underlying mechanisms of glucose intolerance were reductions in insulin-stimulated blood flow and glucose uptake in the skeletal muscle and were independent of changes in capillary density or vascular permeability. CONCLUSIONS Results from this study support the conclusion that endothelial Arf6 signaling is essential for maintaining insulin sensitivity. Reduced expression of endothelial Arf6 impairs insulin-mediated vasodilation and results in systemic insulin resistance. These results have therapeutic implications for diseases that are associated with endothelial cell dysfunction and insulin resistance such as diabetes.
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Affiliation(s)
- Md Torikul Islam
- Department of Nutrition and Integrative Physiology (M.T.I., S.I.B., A.J.D., W.L.H., L.A.L.), The University of Utah, Salt Lake City
| | - Jinjin Cai
- Division of Geriatrics, Department of Internal Medicine (J.C., S.A., D.G.M., R.C.B., J.M., A.J.D., L.A.L.), The University of Utah, Salt Lake City
| | - Shanena Allen
- Division of Geriatrics, Department of Internal Medicine (J.C., S.A., D.G.M., R.C.B., J.M., A.J.D., L.A.L.), The University of Utah, Salt Lake City
| | - Denisse G Moreno
- Division of Geriatrics, Department of Internal Medicine (J.C., S.A., D.G.M., R.C.B., J.M., A.J.D., L.A.L.), The University of Utah, Salt Lake City
| | - Samuel I Bloom
- Department of Nutrition and Integrative Physiology (M.T.I., S.I.B., A.J.D., W.L.H., L.A.L.), The University of Utah, Salt Lake City
| | - R Colton Bramwell
- Division of Geriatrics, Department of Internal Medicine (J.C., S.A., D.G.M., R.C.B., J.M., A.J.D., L.A.L.), The University of Utah, Salt Lake City
| | - Jonathan Mitton
- Division of Geriatrics, Department of Internal Medicine (J.C., S.A., D.G.M., R.C.B., J.M., A.J.D., L.A.L.), The University of Utah, Salt Lake City
| | - Andrew G Horn
- Department of Kinesiology, Kansas State University, Manhattan (A.G.H.)
| | - Weiquan Zhu
- Division of Cardiovascular Medicine, Department of Internal Medicine (W.Z.), The University of Utah, Salt Lake City
- Department of Pathology (W.Z.), The University of Utah, Salt Lake City
- Program of Molecular Medicine (W.Z.), The University of Utah, Salt Lake City
| | - Anthony J Donato
- Department of Nutrition and Integrative Physiology (M.T.I., S.I.B., A.J.D., W.L.H., L.A.L.), The University of Utah, Salt Lake City
- Division of Geriatrics, Department of Internal Medicine (J.C., S.A., D.G.M., R.C.B., J.M., A.J.D., L.A.L.), The University of Utah, Salt Lake City
- Department of Biochemistry (A.J.D.), The University of Utah, Salt Lake City
- Nora Eccles Harrison Cardiovascular Research and Training Institute (A.J.D., L.A.L.), The University of Utah, Salt Lake City
- Veteran's Affairs Medical Center-Salt Lake City, Geriatric Research and Clinical Center, UT (A.J.D., L.A.L.)
| | - William L Holland
- Department of Nutrition and Integrative Physiology (M.T.I., S.I.B., A.J.D., W.L.H., L.A.L.), The University of Utah, Salt Lake City
| | - Lisa A Lesniewski
- Department of Nutrition and Integrative Physiology (M.T.I., S.I.B., A.J.D., W.L.H., L.A.L.), The University of Utah, Salt Lake City
- Division of Geriatrics, Department of Internal Medicine (J.C., S.A., D.G.M., R.C.B., J.M., A.J.D., L.A.L.), The University of Utah, Salt Lake City
- Nora Eccles Harrison Cardiovascular Research and Training Institute (A.J.D., L.A.L.), The University of Utah, Salt Lake City
- Veteran's Affairs Medical Center-Salt Lake City, Geriatric Research and Clinical Center, UT (A.J.D., L.A.L.)
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Islam MT, Hall SA, Dutson T, Bloom SI, Bramwell RC, Kim J, Tucker JR, Machin DR, Donato AJ, Lesniewski LA. Endothelial cell-specific reduction in mTOR ameliorates age-related arterial and metabolic dysfunction. Aging Cell 2024; 23:e14040. [PMID: 38017701 PMCID: PMC10861194 DOI: 10.1111/acel.14040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 10/04/2023] [Accepted: 10/23/2023] [Indexed: 11/30/2023] Open
Abstract
Systemic inhibition of the mammalian target of rapamycin (mTOR) delays aging and many age-related conditions including arterial and metabolic dysfunction. However, the mechanisms and tissues involved in these beneficial effects remain largely unknown. Here, we demonstrate that activation of S6K, a downstream target of mTOR, is increased in arteries with advancing age, and that this occurs preferentially in the endothelium compared with the vascular smooth muscle. Induced endothelial cell-specific deletion of mTOR reduced protein expression by 60-70%. Although this did not significantly alter arterial and metabolic function in young mice, endothelial mTOR reduction reversed arterial stiffening and improved endothelium-dependent dilation (EDD) in old mice, indicating an improvement in age-related arterial dysfunction. Improvement in arterial function in old mice was concomitant with reductions in arterial cellular senescence, inflammation, and oxidative stress. The reduction in endothelial mTOR also improved glucose tolerance in old mice, and this was associated with attenuated hepatic gluconeogenesis and improved lipid tolerance, but was independent of alterations in peripheral insulin sensitivity, pancreatic beta cell function, or fasted plasma lipids in old mice. Lastly, we found that endothelial mTOR reduction suppressed gene expression of senescence and inflammatory markers in endothelial-rich (i.e., lung) and metabolically active organs (i.e., liver and adipose tissue), which may have contributed to the improvement in metabolic function in old mice. This is the first evidence demonstrating that reducing endothelial mTOR in old age improves arterial and metabolic function. These findings have implications for future drug development.
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Affiliation(s)
- Md Torikul Islam
- Department of Nutrition and Integrative PhysiologyThe University of UtahSalt Lake CityUtahUSA
| | - Shelby A. Hall
- Department of Nutrition and Integrative PhysiologyThe University of UtahSalt Lake CityUtahUSA
| | - Tavia Dutson
- Division of Geriatrics, Department of Internal MedicineThe University of Utah School of MedicineSalt Lake CityUtahUSA
| | - Samuel I. Bloom
- Department of Nutrition and Integrative PhysiologyThe University of UtahSalt Lake CityUtahUSA
| | - R. Colton Bramwell
- Division of Geriatrics, Department of Internal MedicineThe University of Utah School of MedicineSalt Lake CityUtahUSA
| | - John Kim
- Nora Eccles Harrison Cardiovascular Research and Training InstituteThe University of UtahSalt Lake CityUtahUSA
| | - Jordan R. Tucker
- Division of Geriatrics, Department of Internal MedicineThe University of Utah School of MedicineSalt Lake CityUtahUSA
| | - Daniel R. Machin
- Division of Geriatrics, Department of Internal MedicineThe University of Utah School of MedicineSalt Lake CityUtahUSA
| | - Anthony J. Donato
- Department of Nutrition and Integrative PhysiologyThe University of UtahSalt Lake CityUtahUSA
- Division of Geriatrics, Department of Internal MedicineThe University of Utah School of MedicineSalt Lake CityUtahUSA
- Nora Eccles Harrison Cardiovascular Research and Training InstituteThe University of UtahSalt Lake CityUtahUSA
- Geriatric Research Education and Clinical CenterVeteran's Affairs Medical CenterSalt Lake CityUtahUSA
- Department of BiochemistryThe University of UtahSalt Lake CityUtahUSA
| | - Lisa A. Lesniewski
- Department of Nutrition and Integrative PhysiologyThe University of UtahSalt Lake CityUtahUSA
- Division of Geriatrics, Department of Internal MedicineThe University of Utah School of MedicineSalt Lake CityUtahUSA
- Nora Eccles Harrison Cardiovascular Research and Training InstituteThe University of UtahSalt Lake CityUtahUSA
- Geriatric Research Education and Clinical CenterVeteran's Affairs Medical CenterSalt Lake CityUtahUSA
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Madkour MI, Islam MT, Tippetts TS, Chowdhury KH, Lesniewski LA, Summers SA, Zeb F, Abdelrahim DN, AlKurd R, Khraiwesh HM, AbuShihab KH, AlBakri A, Obaideen K, Faris ME. Publisher Correction: Ramadan intermittent fasting is associated with ameliorated inflammatory markers and improved plasma sphingolipids/ceramides in subjects with obesity: lipidomics analysis. Sci Rep 2023; 13:22671. [PMID: 38114520 PMCID: PMC10730533 DOI: 10.1038/s41598-023-48849-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2023] Open
Affiliation(s)
- Mohamed Ibrahim Madkour
- Department of Medical Laboratory Sciences, College of Health Sciences, University of Sharjah, Sharjah, UAE
- Research Institute of Medical and Health Sciences (RIMHS), University of Sharjah, Sharjah, UAE
| | - Md Torikul Islam
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
| | - Trevor S Tippetts
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
| | - Kamrul H Chowdhury
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
| | - Lisa A Lesniewski
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
| | - Scott A Summers
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
| | - Falak Zeb
- Research Institute of Medical and Health Sciences (RIMHS), University of Sharjah, Sharjah, UAE
| | - Dana N Abdelrahim
- Research Institute of Medical and Health Sciences (RIMHS), University of Sharjah, Sharjah, UAE
| | - Refat AlKurd
- Department of Nutrition, Faculty of Pharmacy and Medical Sciences, University of Petra, Amman, Jordan
| | - Husam M Khraiwesh
- Department of Nutrition and Food Processing, Faculty of Agricultural Technology, Al-Balqa Applied University, Salt, Jordan
| | - Katia H AbuShihab
- Research Institute of Medical and Health Sciences (RIMHS), University of Sharjah, Sharjah, UAE
| | - Asma AlBakri
- Department of Nutrition and Food Technology, Faculty of Agriculture, The University of Jordan, Amman, Jordan
| | - Khaled Obaideen
- Sustainable Energy and Power Systems Research Centre, RISE, University of Sharjah, Sharjah, UAE
| | - MoezAlIslam E Faris
- Research Institute of Medical and Health Sciences (RIMHS), University of Sharjah, Sharjah, UAE.
- Department of Clinical Nutrition and Dietetics, College of Health Sciences, University of Sharjah, Sharjah, UAE.
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Madkour MI, Islam MT, Tippetts TS, Chowdhury KH, Lesniewski LA, Summers SA, Zeb F, Abdelrahim DN, AlKurd R, Khraiwesh HM, AbuShihab KH, AlBakri A, Obaideen K, Faris ME. Ramadan intermittent fasting is associated with ameliorated inflammatory markers and improved plasma sphingolipids/ceramides in subjects with obesity: lipidomics analysis. Sci Rep 2023; 13:17322. [PMID: 37833312 PMCID: PMC10576029 DOI: 10.1038/s41598-023-43862-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Accepted: 09/29/2023] [Indexed: 10/15/2023] Open
Abstract
Intermittent fasting (IF) is associated with enormous metabolic alterations that underpin its diverse health effects. Changes in lipid metabolism, particularly ceramides, and other sphingolipids, are among the most notable of these alterations. This study investigated the lipidomic alterations associated with 29-30 days of Ramadan diurnal intermittent fasting (RIF) in metabolically healthy overweight and obese subjects. A prospective cohort of 57 overweight and obese adults (70% males, 38.4 ± 11.2 years), with an age range of 18-58 years was observed prior to and at the conclusion of Ramadan. At both time points, anthropometric, biochemical (lipid profile, glycemic, and inflammatory markers), and dietary intake measurements were taken. Using liquid chromatography-mass spectrometry, a lipidomic analysis of ceramides and other sphingolipids was conducted. Using paired sample t-tests, pre- and post-Ramadan anthropometric, biochemical, and dietary values were compared. RIF was associated with improved levels of lipid profile compartments and inflammatory markers. In addition, RIF was associated with a decrease in plasma sphingosine and sphinganine, which was accompanied by a decrease in sphingosine 1-phosphate and sphinganine 1-phosphate. In addition, RIF was associated with decreased C17, C22, and C24 sphingomyelin, but not C14, C16, C18, C20, and C24:1 sphingomyelin, as well as C20, C22, C24, and C24:1 dihydrosphingomyelin, but not C16 and C18 dihydrosphingomyelin. This study demonstrates that RIF is associated with improvements in plasma sphingosine, sphinganine sphingomyelin, and dihydrosphingomyelin lipid species, as well as improved lipid profile and inflammatory markers, which may confer short-term protection against cardiometabolic problems in patients with overweight/obesity.
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Affiliation(s)
- Mohamed Ibrahim Madkour
- Department of Medical Laboratory Sciences, College of Health Sciences, University of Sharjah, Sharjah, UAE
- Research Institute of Medical and Health Sciences (RIMHS), University of Sharjah, Sharjah, UAE
| | - Md Torikul Islam
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
| | - Trevor S Tippetts
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
| | - Kamrul H Chowdhury
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
| | - Lisa A Lesniewski
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
| | - Scott A Summers
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
| | - Falak Zeb
- Research Institute of Medical and Health Sciences (RIMHS), University of Sharjah, Sharjah, UAE
| | - Dana N Abdelrahim
- Research Institute of Medical and Health Sciences (RIMHS), University of Sharjah, Sharjah, UAE
| | - Refat AlKurd
- Department of Nutrition, Faculty of Pharmacy and Medical Sciences, University of Petra, Amman, Jordan
| | - Husam M Khraiwesh
- Department of Nutrition and Food Processing, Faculty of Agricultural Technology, Al-Balqa Applied University, Salt, Jordan
| | - Katia H AbuShihab
- Research Institute of Medical and Health Sciences (RIMHS), University of Sharjah, Sharjah, UAE
| | - Asma AlBakri
- Department of Nutrition and Food Technology, School of Agriculture, The University of Jordan, Amman, Jordan
| | - Khaled Obaideen
- Sustainable Energy and Power Systems Research Centre, RISE, University of Sharjah, Sharjah, UAE
| | - MoezAlIslam E Faris
- Research Institute of Medical and Health Sciences (RIMHS), University of Sharjah, Sharjah, UAE.
- Department of Clinical Nutrition and Dietetics, College of Health Sciences, University of Sharjah, Sharjah, UAE.
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5
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Bloom SI, Tucker JR, Machin DR, Abdeahad H, Adeyemo AO, Thomas TG, Bramwell RC, Lesniewski LA, Donato AJ. Reduction of double-strand DNA break repair exacerbates vascular aging. Aging (Albany NY) 2023; 15:9913-9947. [PMID: 37787989 PMCID: PMC10599741 DOI: 10.18632/aging.205066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Accepted: 08/28/2023] [Indexed: 10/04/2023]
Abstract
Advanced age is the greatest risk factor for cardiovascular disease (CVD), the leading cause of death. Arterial function is impaired in advanced age which contributes to the development of CVD. One underexplored hypothesis is that DNA damage within arteries leads to this dysfunction, yet evidence demonstrating the incidence and physiological consequences of DNA damage in arteries, and in particular, in the microvasculature, in advanced age is limited. In the present study, we began by assessing the abundance of DNA damage in human and mouse lung microvascular endothelial cells and found that aging increases the percentage of cells with DNA damage. To explore the physiological consequences of increases in arterial DNA damage, we evaluated measures of endothelial function, microvascular and glycocalyx properties, and arterial stiffness in mice that were lacking or heterozygous for the double-strand DNA break repair protein ATM kinase. Surprisingly, in young mice, vascular function remained unchanged which led us to rationalize that perhaps aging is required to accumulate DNA damage. Indeed, in comparison to wild type littermate controls, mice heterozygous for ATM that were aged to ~18 mo (Old ATM +/-) displayed an accelerated vascular aging phenotype characterized by increases in arterial DNA damage, senescence signaling, and impairments in endothelium-dependent dilation due to elevated oxidative stress. Furthermore, old ATM +/- mice had reduced microvascular density and glycocalyx thickness as well as increased arterial stiffness. Collectively, these data demonstrate that DNA damage that accumulates in arteries in advanced age contributes to arterial dysfunction that is known to drive CVD.
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Affiliation(s)
- Samuel I. Bloom
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT 84148, USA
| | - Jordan R. Tucker
- Department of Internal Medicine, Division of Geriatrics, University of Utah School of Medicine, Salt Lake City, UT 84148, USA
| | - Daniel R. Machin
- Department of Nutrition and Integrative Physiology, Florida State University, Tallahassee, FL 32304, USA
| | - Hossein Abdeahad
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT 84148, USA
| | - AdeLola O. Adeyemo
- Department of Internal Medicine, Division of Geriatrics, University of Utah School of Medicine, Salt Lake City, UT 84148, USA
| | - Tyler G. Thomas
- Department of Internal Medicine, Division of Geriatrics, University of Utah School of Medicine, Salt Lake City, UT 84148, USA
| | - R. Colton Bramwell
- Department of Internal Medicine, Division of Geriatrics, University of Utah School of Medicine, Salt Lake City, UT 84148, USA
| | - Lisa A. Lesniewski
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT 84148, USA
- Department of Internal Medicine, Division of Geriatrics, University of Utah School of Medicine, Salt Lake City, UT 84148, USA
- Geriatric Research, Education and Clinical Center, Veteran’s Affairs Medical Center-Salt Lake City, Salt Lake City, UT 84148, USA
- Nora Eccles Harrison Cardiovascular Research and Training Institute, The University of Utah, Salt Lake City, UT 84148, USA
| | - Anthony J. Donato
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT 84148, USA
- Department of Internal Medicine, Division of Geriatrics, University of Utah School of Medicine, Salt Lake City, UT 84148, USA
- Geriatric Research, Education and Clinical Center, Veteran’s Affairs Medical Center-Salt Lake City, Salt Lake City, UT 84148, USA
- Nora Eccles Harrison Cardiovascular Research and Training Institute, The University of Utah, Salt Lake City, UT 84148, USA
- Department of Biochemistry, University of Utah, Salt Lake City, UT 84148, USA
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Machin DR, Trott DW, Gogulamudi VR, Islam MT, Bloom SI, Vink H, Lesniewski LA, Donato AJ. Glycocalyx-targeted therapy ameliorates age-related arterial dysfunction. GeroScience 2023; 45:2351-2365. [PMID: 36787090 PMCID: PMC10651573 DOI: 10.1007/s11357-023-00745-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Accepted: 01/26/2023] [Indexed: 02/15/2023] Open
Abstract
Advanced age is accompanied by arterial dysfunction, as well as a diminished glycocalyx, which may be linked to reduced high molecular weight-hyaluronan (HMW-HA) synthesis. However, the impact of glycocalyx deterioration in age-related arterial dysfunction is unknown. We sought to determine if manipulations in glycocalyx properties would alter arterial function. Tamoxifen-induced hyaluronan synthase 2 (Has2) reduction was used to decrease glycocalyx properties. Three weeks post-tamoxifen treatment, glycocalyx thickness was lower in Has2 knockout compared to wild-type mice (P<0.05). Has2 reduction induced arterial dysfunction, demonstrated by impaired endothelium-dependent dilation (EDD) and elevated aortic stiffness (P<0.05). To augment glycocalyx properties, old mice received 10 weeks of a glycocalyx-targeted therapy via Endocalyx™ (old+ECX), which contains HMW-HA and other glycocalyx components. Compared to old control mice, glycocalyx properties and EDD were augmented, and aortic stiffness decreased in old+ECX mice (P<0.05). Old+ECX mice had a more youthful aortic phenotype, demonstrated by lower collagen content and higher elastin content than old control mice (P<0.05). Functional outcomes were repeated in old mice that underwent a diet supplemented solely with HMW-HA (old+HA). Compared to old controls, glycocalyx properties and EDD were augmented, and aortic stiffness was lower in old+HA mice (P<0.05). We did not observe any differences between old+HA and old+ECX mice (P>0.05). Has2 reduction phenocopies age-related arterial dysfunction, while 10 weeks of glycocalyx-targeted therapy that restores the glycocalyx also ameliorates age-related arterial dysfunction. These findings suggest that the glycocalyx may be a viable therapeutic target to ameliorate age-related arterial dysfunction.
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Affiliation(s)
- Daniel R Machin
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA.
- Department of Nutrition and Integrative Physiology, Florida State University, Tallahassee, FL, 32306, USA.
| | - Daniel W Trott
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA
| | | | - Md Torikul Islam
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
| | - Samuel I Bloom
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
| | - Hans Vink
- Department of Physiology, Cardiovascular Research Institute Maastricht, Maastricht, The Netherlands
- MicroVascular Health Solutions LLC, Alpine, UT, USA
| | - Lisa A Lesniewski
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
- VA Salt Lake City, GRECC, Salt Lake City, UT, USA
| | - Anthony J Donato
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
- VA Salt Lake City, GRECC, Salt Lake City, UT, USA
- Department of Biochemistry, University of Utah, Salt Lake City, UT, USA
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Bloom SI, Liu Y, Tucker JR, Islam MT, Machin DR, Abdeahad H, Thomas TG, Bramwell RC, Lesniewski LA, Donato AJ. Endothelial cell telomere dysfunction induces senescence and results in vascular and metabolic impairments. Aging Cell 2023; 22:e13875. [PMID: 37259606 PMCID: PMC10410008 DOI: 10.1111/acel.13875] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 04/03/2023] [Accepted: 05/04/2023] [Indexed: 06/02/2023] Open
Abstract
In advanced age, increases in oxidative stress and inflammation impair endothelial function, which contributes to the development of cardiovascular disease (CVD). One plausible source of this oxidative stress and inflammation is an increase in the abundance of senescent endothelial cells. Cellular senescence is a cell cycle arrest that occurs in response to various damaging stimuli. In the present study, we tested the hypothesis that advanced age results in endothelial cell telomere dysfunction that induces senescence. In both human and mouse endothelial cells, advanced age resulted in an increased abundance of dysfunctional telomeres, characterized by activation of DNA damage signaling at telomeric DNA. To test whether this results in senescence, we selectively reduced the telomere shelterin protein telomere repeat binding factor 2 (Trf2) from endothelial cells of young mice. Trf2 reduction increased endothelial cell telomere dysfunction and resulted in cellular senescence. Furthermore, induction of endothelial cell telomere dysfunction increased inflammatory signaling and oxidative stress, resulting in impairments in endothelial function. Finally, we demonstrate that endothelial cell telomere dysfunction-induced senescence impairs glucose tolerance. This likely occurs through increases in inflammatory signaling in the liver and adipose tissue, as well as reductions in microvascular density and vasodilation to metabolic stimuli. Cumulatively, the findings of the present study identify age-related telomere dysfunction as a mechanism that leads to endothelial cell senescence. Furthermore, these data provide compelling evidence that senescent endothelial cells contribute to age-related increases in oxidative stress and inflammation that impair arterial and metabolic function.
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Affiliation(s)
- Samuel I. Bloom
- Department of Nutrition and Integrative PhysiologyThe University of UtahSalt Lake CityUtahUSA
| | - Yu Liu
- Department of GeriatricsTongji HospitalWuhanChina
- Division of Geriatrics, Department of Internal MedicineUniversity of Utah School of MedicineSalt Lake CityUtahUSA
| | - Jordan R. Tucker
- Division of Geriatrics, Department of Internal MedicineUniversity of Utah School of MedicineSalt Lake CityUtahUSA
| | - Md Torikul Islam
- Department of Nutrition and Integrative PhysiologyThe University of UtahSalt Lake CityUtahUSA
| | - Daniel R. Machin
- Division of Geriatrics, Department of Internal MedicineUniversity of Utah School of MedicineSalt Lake CityUtahUSA
- Department of Nutrition and Integrative PhysiologyFlorida State UniversityTallahasseeFloridaUSA
| | - Hossein Abdeahad
- Department of Nutrition and Integrative PhysiologyThe University of UtahSalt Lake CityUtahUSA
| | - Tyler G. Thomas
- Division of Geriatrics, Department of Internal MedicineUniversity of Utah School of MedicineSalt Lake CityUtahUSA
| | - R. Colton Bramwell
- Division of Geriatrics, Department of Internal MedicineUniversity of Utah School of MedicineSalt Lake CityUtahUSA
| | - Lisa A. Lesniewski
- Department of Nutrition and Integrative PhysiologyThe University of UtahSalt Lake CityUtahUSA
- Division of Geriatrics, Department of Internal MedicineUniversity of Utah School of MedicineSalt Lake CityUtahUSA
- Geriatric Research, Education and Clinical CenterVeteran's Affairs Medical Center‐Salt Lake CitySalt Lake CityUtahUSA
- Nora Eccles Harrison Cardiovascular Research and Training InstituteThe University of UtahSalt Lake CityUtahUSA
| | - Anthony J. Donato
- Department of Nutrition and Integrative PhysiologyThe University of UtahSalt Lake CityUtahUSA
- Division of Geriatrics, Department of Internal MedicineUniversity of Utah School of MedicineSalt Lake CityUtahUSA
- Geriatric Research, Education and Clinical CenterVeteran's Affairs Medical Center‐Salt Lake CitySalt Lake CityUtahUSA
- Nora Eccles Harrison Cardiovascular Research and Training InstituteThe University of UtahSalt Lake CityUtahUSA
- Department of BiochemistryThe University of UtahSalt Lake CityUtahUSA
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Gogulamudi VR, Islam MT, Durrant JR, Adeyemo AO, Trott DW, Hyuhn MH, Zhu W, Donato AJ, Walker AE, Lesniewski LA. Heterozygosity for ADP-ribosylation factor 6 suppresses the burden and severity of atherosclerosis. PLoS One 2023; 18:e0285253. [PMID: 37163513 PMCID: PMC10171652 DOI: 10.1371/journal.pone.0285253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Accepted: 04/18/2023] [Indexed: 05/12/2023] Open
Abstract
Atherosclerosis is the root cause of major cardiovascular diseases (CVD) such as myocardial infarction and stroke. ADP-ribosylation factor 6 (Arf6) is a ubiquitously expressed GTPase known to be involved in inflammation, vascular permeability and is sensitive to changes in shear stress. Here, using atheroprone, ApoE-/- mice, with a single allele deletion of Arf6 (HET) or wildtype Arf6 (WT), we demonstrate that reduction in Arf6 attenuates atherosclerotic plaque burden and severity. We found that plaque burden in the descending aorta was lower in HET compared to WT mice (p˂0.001) after the consumption of an atherogenic Paigen diet for 5 weeks. Likewise, luminal occlusion, necrotic core size, plaque grade, elastic lamina breaks, and matrix deposition were lower in the aortic root atheromas of HET compared to WT mice (all p≤0.05). We also induced advanced human-like complex atherosclerotic plaque in the left carotid artery using partial carotid ligation surgery and found that atheroma area, plaque grade, intimal necrosis, intraplaque hemorrhage, thrombosis, and calcification were lower in HET compared to WT mice (all p≤0.04). Our findings suggest that the atheroprotection afforded by Arf6 heterozygosity may result from reduced immune cell migration (all p≤0.005) as well as endothelial and vascular smooth muscle cell proliferation (both p≤0.001) but independent of changes in circulating lipids (all p≥0.40). These findings demonstrate a critical role for Arf6 in the development and severity of atherosclerosis and suggest that Arf6 inhibition can be explored as a novel therapeutic strategy for the treatment of atherosclerotic CVD.
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Affiliation(s)
- Venkateswara R. Gogulamudi
- Department of Internal Medicine, Division of Geriatrics, The University of Utah, Salt Lake City, Utah, United States of America
| | - Md Torikul Islam
- Department of Nutrition and Integrative Physiology, The University of Utah, Salt Lake City, Utah, United States of America
| | - Jessica R. Durrant
- Dallas Tissue Research, Farmers Branch, Texas, Dallas, United States of America
| | - Adelola O. Adeyemo
- Department of Internal Medicine, Division of Geriatrics, The University of Utah, Salt Lake City, Utah, United States of America
| | - Daniel W. Trott
- Department of Internal Medicine, Division of Geriatrics, The University of Utah, Salt Lake City, Utah, United States of America
- Department of Internal Medicine, Division of Cardiovascular Medicine, The University of Utah, Salt Lake City, Utah, United States of America
| | - Mi Ho Hyuhn
- Department of Internal Medicine, Division of Geriatrics, The University of Utah, Salt Lake City, Utah, United States of America
| | - Weiquan Zhu
- Department of Internal Medicine, Division of Cardiovascular Medicine, The University of Utah, Salt Lake City, Utah, United States of America
- Department of Pathology, The University of Utah, Salt Lake City, Utah, United States of America
- Program of Molecular Medicine, The University of Utah, Salt Lake City, Utah, United States of America
| | - Anthony J. Donato
- Department of Internal Medicine, Division of Geriatrics, The University of Utah, Salt Lake City, Utah, United States of America
- Department of Nutrition and Integrative Physiology, The University of Utah, Salt Lake City, Utah, United States of America
- Geriatric Research Education and Clinical Center, Veteran’s Affairs Medical Center-Salt Lake City, Salt Lake City, Utah, United States of America
- Department of Biochemistry, The University of Utah, Salt Lake City, Utah, United States of America
- Nora Eccles Harrison Cardiovascular Research and Training Institute, The University of Utah, Salt Lake City, Utah, United States of America
| | - Ashley E. Walker
- Department of Internal Medicine, Division of Geriatrics, The University of Utah, Salt Lake City, Utah, United States of America
- Department of Human Physiology, The University of Oregon, Eugene, Oregon, United States of America
| | - Lisa A. Lesniewski
- Department of Internal Medicine, Division of Geriatrics, The University of Utah, Salt Lake City, Utah, United States of America
- Department of Nutrition and Integrative Physiology, The University of Utah, Salt Lake City, Utah, United States of America
- Geriatric Research Education and Clinical Center, Veteran’s Affairs Medical Center-Salt Lake City, Salt Lake City, Utah, United States of America
- Nora Eccles Harrison Cardiovascular Research and Training Institute, The University of Utah, Salt Lake City, Utah, United States of America
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Islam MT, Cai J, Allen S, Moreno DG, Bloom SI, Bramwell RC, Mitton J, Horn AG, Zhu W, Donato AJ, Holland WL, Lesniewski LA. Endothelial specific reduction in Arf6 impairs insulin-stimulated vasodilation and skeletal muscle blood flow resulting in systemic insulin resistance. bioRxiv 2023:2023.05.02.539173. [PMID: 37205339 PMCID: PMC10187242 DOI: 10.1101/2023.05.02.539173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Background Much of what we know about insulin resistance is based on studies from metabolically active tissues such as liver, adipose tissue, and skeletal muscle. Emerging evidence suggests that the vascular endothelium plays a crucial role in systemic insulin resistance, however, the underlying mechanisms remain incompletely understood. ADP ribosylation factor 6 (Arf6) is a small GTPase that plays a critical role in endothelial cell (EC) function. Here, we tested the hypothesis that the deletion of endothelial Arf6 will result in systemic insulin resistance. Methods We used mouse models of constitutive EC-specific Arf6 deletion (Arf6 f/- Tie2Cre) and tamoxifen inducible Arf6 knockout (Arf6 f/f Cdh5Cre). Endothelium-dependent vasodilation was assessed using pressure myography. Metabolic function was assessed using a battery of metabolic assessments including glucose- and insulin-tolerance tests and hyperinsulinemic-euglycemic clamps. A fluorescence microsphere-based technique was used to measure tissue blood flow. Intravital microscopy was used to assess skeletal muscle capillary density. Results Endothelial Arf6 deletion impaired insulin-stimulated vasodilation in white adipose tissue (WAT) and skeletal muscle feed arteries. The impairment in vasodilation was primarily due to attenuated insulin-stimulated nitric oxide (NO) bioavailability but independent of altered acetylcholine- or sodium nitroprusside-mediated vasodilation. In vitro Arf6 inhibition resulted in suppressed insulin stimulated phosphorylation of Akt and endothelial NO synthase. Endothelial cell-specific deletion of Arf6 also resulted in systematic insulin resistance in normal chow fed mice and glucose intolerance in high fat diet fed obese mice. The underlying mechanisms of glucose intolerance were reductions in insulin-stimulated blood flow and glucose uptake in the skeletal muscle and were independent of changes in capillary density or vascular permeability. Conclusion Results from this study support the conclusion that endothelial Arf6 signaling is essential for maintaining insulin sensitivity. Reduced expression of endothelial Arf6 impairs insulin-mediated vasodilation and results in systemic insulin resistance. These results have therapeutic implications for diseases that are associated with endothelial cell dysfunction and insulin resistance such as diabetes.
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Gogulamudi VR, Durrant JR, Adeyemo AO, Ho HM, Walker AE, Lesniewski LA. Advancing age increases the size and severity of spontaneous atheromas in mouse models of atherosclerosis. GeroScience 2023:10.1007/s11357-023-00776-8. [PMID: 37086367 PMCID: PMC10400524 DOI: 10.1007/s11357-023-00776-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Accepted: 03/17/2023] [Indexed: 04/23/2023] Open
Abstract
Using multiple mouse models, we explored the impact of aging on the size and severity of atherosclerotic lesions. In young, middle-aged and old apolipoprotein E knockout mice (ApoE-/-) fed an atherogenic diet (AD) for 3-8 weeks, plaque/atheroma formation in the descending aorta and aortic root, and atheroma development in the carotid in response to partial carotid ligation (PCL) were assessed. Total and LDL cholesterol, and triglycerides were higher in old compared to both other age groups, regardless of AD duration. Aortic plaque burden increased with AD duration in all ages. The size and plaque morphology grade of aortic root atheromas was higher with age; however, there was no effect of age on the size or severity of carotid atheromas after PCL. We additionally induced hyperlipidemia in young and old C57BL/6 mice by adeno-associated virus mediated upregulation of LDL receptor regulator, Pcsk9, and 5 weeks of AD. Despite lower cholesterol in old compared to young Pcsk9 mice, there was a greater size and severity of aortic root atheromas in old mice. However, like the ApoE-/- mice, there was no effect of age on size or severity of PCL-induced carotid artery atheromas in Pcsk9 mice. Together, these results suggest that aging increases the size and severity of spontaneous aortic atheromas.
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Affiliation(s)
- Venkateswara R Gogulamudi
- Internal Medicine-Geriatrics, University of Utah, Salt Lake City, UT, USA
- Geriatrics Research Education and Clinical Center, Veteran's Affairs Medical Center-Salt Lake City, Salt Lake City, UT, USA
| | | | - Adelola O Adeyemo
- Internal Medicine-Geriatrics, University of Utah, Salt Lake City, UT, USA
- Geriatrics Research Education and Clinical Center, Veteran's Affairs Medical Center-Salt Lake City, Salt Lake City, UT, USA
| | - Huynh Mi Ho
- Internal Medicine-Geriatrics, University of Utah, Salt Lake City, UT, USA
| | - Ashley E Walker
- Department of Human Physiology, University of Oregon, Eugene, OR, USA
| | - Lisa A Lesniewski
- Internal Medicine-Geriatrics, University of Utah, Salt Lake City, UT, USA.
- Geriatrics Research Education and Clinical Center, Veteran's Affairs Medical Center-Salt Lake City, Salt Lake City, UT, USA.
- Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA.
- Nora Eccles Harrison Cardiovascular Research and Training Institute, University of Utah, Salt Lake City, UT, USA.
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11
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Islam MT, Tuday E, Allen S, Kim J, Trott DW, Holland WL, Donato AJ, Lesniewski LA. Senolytic drugs, dasatinib and quercetin, attenuate adipose tissue inflammation, and ameliorate metabolic function in old age. Aging Cell 2023; 22:e13767. [PMID: 36637079 PMCID: PMC9924942 DOI: 10.1111/acel.13767] [Citation(s) in RCA: 18] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 12/12/2022] [Accepted: 12/19/2022] [Indexed: 01/14/2023] Open
Abstract
Aging results in an elevated burden of senescent cells, senescence-associated secretory phenotype (SASP), and tissue infiltration of immune cells contributing to chronic low-grade inflammation and a host of age-related diseases. Recent evidence suggests that the clearance of senescent cells alleviates chronic inflammation and its associated dysfunction and diseases. However, the effect of this intervention on metabolic function in old age remains poorly understood. Here, we demonstrate that dasatinib and quercetin (D&Q) have senolytic effects, reducing age-related increase in senescence-associated β-galactosidase, expression of p16 and p21 gene and P16 protein in perigonadal white adipose tissue (pgWAT; all p ≤ 0.04). This treatment also suppressed age-related increase in the expression of a subset of pro-inflammatory SASP genes (mcp1, tnf-α, il-1α, il-1β, il-6, cxcl2, and cxcl10), crown-like structures, abundance of T cells and macrophages in pgWAT (all p ≤ 0.04). In the liver and skeletal muscle, we did not find a robust effect of D&Q on senescence and inflammatory SASP markers. Although we did not observe an age-related difference in glucose tolerance, D&Q treatment improved fasting blood glucose (p = 0.001) and glucose tolerance (p = 0.007) in old mice that was concomitant with lower hepatic gluconeogenesis. Additionally, D&Q improved insulin-stimulated suppression of plasma NEFAs (p = 0.01), reduced fed and fasted plasma triglycerides (both p ≤ 0.04), and improved systemic lipid tolerance (p = 0.006). Collectively, results from this study suggest that D&Q attenuates adipose tissue inflammation and improves systemic metabolic function in old age. These findings have implications for the development of therapeutic agents to combat metabolic dysfunction and diseases in old age.
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Affiliation(s)
- Md Torikul Islam
- Department of Nutrition and Integrative PhysiologyThe University of UtahSalt Lake CityUtahUSA
| | - Eric Tuday
- Geriatric Research Education and Clinical CenterVeteran's Affairs Medical Center‐Salt Lake CitySalt Lake CityUtahUSA
- Division of Cardiology, Department of Internal MedicineThe University of Utah School of MedicineSalt Lake CityUtahUSA
| | - Shanena Allen
- Geriatric Research Education and Clinical CenterVeteran's Affairs Medical Center‐Salt Lake CitySalt Lake CityUtahUSA
| | - John Kim
- Geriatric Research Education and Clinical CenterVeteran's Affairs Medical Center‐Salt Lake CitySalt Lake CityUtahUSA
| | - Daniel W. Trott
- Department of KinesiologyThe University of Texas at ArlingtonArlingtonTexasUSA
| | - William L. Holland
- Department of Nutrition and Integrative PhysiologyThe University of UtahSalt Lake CityUtahUSA
| | - Anthony J. Donato
- Department of Nutrition and Integrative PhysiologyThe University of UtahSalt Lake CityUtahUSA
- Geriatric Research Education and Clinical CenterVeteran's Affairs Medical Center‐Salt Lake CitySalt Lake CityUtahUSA
- Division of Geriatrics, Department of Internal MedicineThe University of Utah School of MedicineSalt Lake CityUtahUSA
- Department of BiochemistryThe University of UtahSalt Lake CityUtahUSA
- Nora Eccles Harrison Cardiovascular Research and Training InstituteThe University of UtahSalt Lake CityUtahUSA
| | - Lisa A. Lesniewski
- Department of Nutrition and Integrative PhysiologyThe University of UtahSalt Lake CityUtahUSA
- Geriatric Research Education and Clinical CenterVeteran's Affairs Medical Center‐Salt Lake CitySalt Lake CityUtahUSA
- Division of Geriatrics, Department of Internal MedicineThe University of Utah School of MedicineSalt Lake CityUtahUSA
- Nora Eccles Harrison Cardiovascular Research and Training InstituteThe University of UtahSalt Lake CityUtahUSA
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Abstract
Endothelial cells are located at the crucial interface between circulating blood and semi-solid tissues and have many important roles in maintaining systemic physiological function. The vascular endothelium is particularly susceptible to pathogenic stimuli that activate tumour suppressor pathways leading to cellular senescence. We now understand that senescent endothelial cells are highly active, secretory and pro-inflammatory, and have an aberrant morphological phenotype. Moreover, endothelial senescence has been identified as an important contributor to various cardiovascular and metabolic diseases. In this Review, we discuss the consequences of endothelial cell exposure to damaging stimuli (haemodynamic forces and circulating and endothelial-derived factors) and the cellular and molecular mechanisms that induce endothelial cell senescence. We also discuss how endothelial cell senescence causes arterial dysfunction and contributes to clinical cardiovascular diseases and metabolic disorders. Finally, we summarize the latest evidence on the effect of eliminating senescent endothelial cells (senolysis) and identify important remaining questions to be addressed in future studies.
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Affiliation(s)
- Samuel I Bloom
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
| | - Md Torikul Islam
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
| | - Lisa A Lesniewski
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
- Department of Internal Medicine, Division of Geriatrics, University of Utah, Salt Lake City, UT, USA
- Veterans Affairs Medical Center-Salt Lake City, Geriatric Research Education and Clinical Center, Salt Lake City, UT, USA
| | - Anthony J Donato
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA.
- Department of Internal Medicine, Division of Geriatrics, University of Utah, Salt Lake City, UT, USA.
- Veterans Affairs Medical Center-Salt Lake City, Geriatric Research Education and Clinical Center, Salt Lake City, UT, USA.
- Department of Biochemistry, University of Utah, Salt Lake City, UT, USA.
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13
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Bloom SI, Tucker JR, Lim J, Thomas TG, Stoddard GJ, Lesniewski LA, Donato AJ. Aging results in DNA damage and telomere dysfunction that is greater in endothelial versus vascular smooth muscle cells and is exacerbated in atheroprone regions. GeroScience 2022; 44:2741-2755. [PMID: 36350415 PMCID: PMC9768045 DOI: 10.1007/s11357-022-00681-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Accepted: 10/26/2022] [Indexed: 11/11/2022] Open
Abstract
Aging increases the risk of atherosclerotic cardiovascular disease which is associated with arterial senescence; however, the mechanisms responsible for the development of cellular senescence in endothelial cells (ECs) and vascular smooth muscle cells (VSMCs) remain elusive. Here, we study the effect of aging on arterial DNA damage and telomere dysfunction. Aging resulted in greater DNA damage in ECs than VSMCs. Further, telomere dysfunction-associated DNA damage foci (TAF: DNA damage signaling at telomeres) were elevated with aging in ECs but not VMSCs. Telomere length was modestly reduced in ECs with aging and not sufficient to induce telomere dysfunction. DNA damage and telomere dysfunction were greatest in atheroprone regions (aortic minor arch) versus non-atheroprone regions (thoracic aorta). Collectively, these data demonstrate that aging results in DNA damage and telomere dysfunction that is greater in ECs than VSMCs and elevated in atheroprone aortic regions.
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Affiliation(s)
- Samuel I Bloom
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
| | - Jordan R Tucker
- Department of Internal Medicine, Division of Geriatrics, University of Utah, VA Medical Center-SLC, GRECC Building 2, Rm 2D15A, 500 Foothill Dr., Salt Lake City, UT, USA
| | - Jisok Lim
- Department of Internal Medicine, Division of Geriatrics, University of Utah, VA Medical Center-SLC, GRECC Building 2, Rm 2D15A, 500 Foothill Dr., Salt Lake City, UT, USA
| | - Tyler G Thomas
- Department of Internal Medicine, Division of Geriatrics, University of Utah, VA Medical Center-SLC, GRECC Building 2, Rm 2D15A, 500 Foothill Dr., Salt Lake City, UT, USA
| | - Gregory J Stoddard
- Department of Internal Medicine, Division of Geriatrics, University of Utah, VA Medical Center-SLC, GRECC Building 2, Rm 2D15A, 500 Foothill Dr., Salt Lake City, UT, USA
| | - Lisa A Lesniewski
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
- Department of Internal Medicine, Division of Geriatrics, University of Utah, VA Medical Center-SLC, GRECC Building 2, Rm 2D15A, 500 Foothill Dr., Salt Lake City, UT, USA
- Geriatric Research and Clinical Center, Veteran's Affairs Medical Center-Salt Lake City, Salt Lake City, UT, USA
- Nora Eccles Harrison Cardiovascular Research and Training Institute, University of Utah, Salt Lake City, UT, USA
| | - Anthony J Donato
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA.
- Department of Internal Medicine, Division of Geriatrics, University of Utah, VA Medical Center-SLC, GRECC Building 2, Rm 2D15A, 500 Foothill Dr., Salt Lake City, UT, USA.
- Geriatric Research and Clinical Center, Veteran's Affairs Medical Center-Salt Lake City, Salt Lake City, UT, USA.
- Nora Eccles Harrison Cardiovascular Research and Training Institute, University of Utah, Salt Lake City, UT, USA.
- Department of Biochemistry, University of Utah, Salt Lake City, UT, USA.
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14
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Bloom SI, Tucker JR, Liu Y, Abdeahad H, Machin DR, Thomas TG, Bramwell RC, Islam MT, Lesniewski LA, Donato AJ. Aging results in endothelial cell telomere uncapping that induces senescence and physiological dysfunction. FASEB J 2022. [DOI: 10.1096/fasebj.2022.36.s1.r4606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Samuel I. Bloom
- Nutrition and Integrative PhysiologyUniversity of UtahSalt Lake CityUT
| | | | - Yu Liu
- Department of GeriatricsTongji HospitalWuhan
| | - Hossein Abdeahad
- Nutrition and Integrative PhysiologyUniversity of UtahSalt Lake CityUT
| | - Daniel R. Machin
- Department oof Nutrition, Food, and Exercise SciencesFlorida State UniversityTallahasseeFL
| | | | | | - Md Torikul Islam
- Nutrition and Integrative PhysiologyUniversity of UtahSalt Lake CityUT
| | - Lisa A. Lesniewski
- Geriatric Research, Education and Clinical CenterVeterans Affairs Medical Center Salt Lake CitySalt Lake CityUT
- Nutrition and Integrative PhysiologyVeterans Affairs Medical Center Salt Lake CitySalt Lake CityUT
- Internal MedicineVeterans Affairs Medical Center Salt Lake CitySalt Lake CityUT
| | - Anthony J. Donato
- Nutrition and Integrative PhysiologyUniversity of UtahSalt Lake CityUT
- Internal MedicineUniversity of UtahSalt Lake CityUT
- BiochemistryUniversity of UtahSalt Lake CityUT
- Geriatric Research, Education and Clinical CenterUniversity of UtahSalt Lake CityUT
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15
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Islam MT, Hall SA, Bloom SI, Bramwell RC, Dutson T, Tucker JR, Kim J, Machin DR, Donato AJ, Lesniewski LA. Ablation of Endothelial mTOR is Benign in Young Mice and Reverses Age‐Related Arterial and Metabolic Impairments in Old Mice. FASEB J 2022. [DOI: 10.1096/fasebj.2022.36.s1.r6002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Md Torikul Islam
- Nutrition and Integrative PhysiologyUniversity of UtahSalt Lake CityUT
| | - Shelby A. Hall
- Nutrition and Integrative PhysiologyUniversity of UtahSalt Lake CityUT
| | - Samuel I. Bloom
- Nutrition and Integrative PhysiologyUniversity of UtahSalt Lake CityUT
| | | | - Tavia Dutson
- Internal MedicineUniversity of UtahSalt Lake CityUT
| | | | - John Kim
- Internal MedicineUniversity of UtahSalt Lake CityUT
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Gogulamudi VR, Machin DR, Henson GD, Lim J, Bramwell RC, Durrant JR, Donato AJ, Lesniewski LA. Sirt1 overexpression attenuates Western-style diet-induced aortic stiffening in mice. Physiol Rep 2022; 10:e15284. [PMID: 35561022 PMCID: PMC9101596 DOI: 10.14814/phy2.15284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Accepted: 03/31/2022] [Indexed: 06/15/2023] Open
Abstract
Increased arterial stiffness is a cardiovascular disease risk factor in the setting of advancing age and Western diet (WD) induced obesity. Increases in large artery stiffness, as measured by pulse wave velocity (PWV), occur within 8 weeks of WD feeding in mice. Sirtuin-1 (Sirt1), a NAD-dependent deacetylase, regulates cellular metabolic activity and activation of this protein has been associated with vasoprotection in aged mice. The aim of the study was to elucidate the effect of global Sirt1 overexpression (Sirttg ) on WD-induced arterial stiffening. Sirt1 overexpression did not influence PWV in normal chow (NC) fed mice. However, PWV was higher in wild-type (WT) mice (p < 0.04), but not in Sirttg mice, after 12 weeks of WD and this effect was independent of changes in blood pressure or the passive pressure diameter relation in the carotid artery. Overexpression of Sirt1 was associated with lower collagen and higher elastin mRNA expression in the aorta of WD fed mice (both p < 0.05). Although MMP2 and MMP3 mRNA were both upregulated in WT mice after WD (both p < 0.05), this effect was reversed in Sirttg mice compared to WT mice fed WD (both p < 0.05). Surprisingly, histologically assessed collagen and elastin quality were unchanged in the aortas of WT or Sirttg mice after WD. However, Sirttg mice were protected from WD-induced glucose intolerance, although there was no difference in insulin tolerance between groups. These findings demonstrate a vasoprotective effect of Sirt1 overexpression that limits the increase in arterial stiffness in response to consumption of a WD.
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Affiliation(s)
| | - Daniel R. Machin
- Department of Internal MedicineUniversity of UtahSalt Lake CityUtahUSA
- Department of Nutrition and Integrative PhysiologyFlorida State UniversityTallahasseeFloridaUSA
| | - Grant D. Henson
- Department of Internal MedicineUniversity of UtahSalt Lake CityUtahUSA
| | - Jisok Lim
- Department of Internal MedicineUniversity of UtahSalt Lake CityUtahUSA
| | | | | | - Anthony J. Donato
- Department of Internal MedicineUniversity of UtahSalt Lake CityUtahUSA
- Geriatrics Research Education and Clinical CenterVeteran’s Affairs Medical CenterSalt Lake CityUtahUSA
- Department of Nutrition and Integrative PhysiologyUniversity of UtahSalt Lake CityUtahUSA
| | - Lisa A. Lesniewski
- Department of Internal MedicineUniversity of UtahSalt Lake CityUtahUSA
- Geriatrics Research Education and Clinical CenterVeteran’s Affairs Medical CenterSalt Lake CityUtahUSA
- Department of Nutrition and Integrative PhysiologyUniversity of UtahSalt Lake CityUtahUSA
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17
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Trott DW, Machin DR, Phuong TTT, Adeyemo AO, Bloom SI, Bramwell RC, Sorensen ES, Lesniewski LA, Donato AJ. T cells mediate cell non-autonomous arterial ageing in mice. J Physiol 2021; 599:3973-3991. [PMID: 34164826 DOI: 10.1113/jp281698] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 06/21/2021] [Indexed: 11/08/2022] Open
Abstract
KEY POINTS Increased large artery stiffness and impaired endothelium-dependent dilatation occur with advanced age. We sought to determine whether T cells mechanistically contribute to age-related arterial dysfunction. We found that old mice exhibited greater proinflammatory T cell accumulation around both the aorta and mesenteric arteries. Pharmacologic depletion or genetic deletion of T cells in old mice resulted in ameliorated large artery stiffness and greater endothelium-dependent dilatation compared with mice with T cells intact. ABSTRACT Ageing of the arteries is characterized by increased large artery stiffness and impaired endothelium-dependent dilatation. T cells contribute to hypertension in acute rodent models but whether they contribute to chronic age-related arterial dysfunction is unknown. To determine whether T cells directly mediate age-related arterial dysfunction, we examined large elastic artery and resistance artery function in young (4-6 months) and old (22-24 months) wild-type mice treated with anti-CD3 F(ab'2) fragments to deplete T cells (150 μg, i.p. every 7 days for 28 days) or isotype control fragments. Old mice exhibited greater numbers of T cells in both aorta and mesenteric vasculature when compared with young mice. Old mice treated with anti-CD3 fragments exhibited depletion of T cells in blood, spleen, aorta and mesenteric vasculature. Old mice also exhibited greater numbers of aortic and mesenteric IFN-γ and TNF-α-producing T cells when compared with young mice. Old control mice exhibited greater large artery stiffness and impaired resistance artery endothelium-dependent dilatation in comparison with young mice. In old mice, large artery stiffness was ameliorated with anti-CD3 treatment. Anti-CD3-treated old mice also exhibited greater endothelium-dependent dilatation than age-matched controls. We also examined arterial function in young and old Rag-1-/- mice, which lack lymphocytes. Rag-1-/- mice exhibited blunted increases in large artery stiffness with age compared with wild-type mice. Old Rag-1-/- mice also exhibited greater endothelium-dependent dilatation compared with old wild-type mice. Collectively, these results demonstrate that T cells play an important role in age-related arterial dysfunction.
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Affiliation(s)
- Daniel W Trott
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA.,Department of Kinesiology, University of Texas at Arlington, Texas, USA
| | - Daniel R Machin
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA
| | - Tam T T Phuong
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA
| | - AdeLola O Adeyemo
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA
| | - Samuel I Bloom
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, Utah, USA
| | - R Colton Bramwell
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA
| | - Eric S Sorensen
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA
| | - Lisa A Lesniewski
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA.,Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, Utah, USA.,Geriatrics Research Education and Clinical Center, Veteran's Affairs Medical Center, Salt Lake City, Utah, USA
| | - Anthony J Donato
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA.,Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, Utah, USA.,Geriatrics Research Education and Clinical Center, Veteran's Affairs Medical Center, Salt Lake City, Utah, USA.,Department of Biochemistry, University of Utah, Salt Lake City, Utah, USA
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Islam MT, Holland WL, Lesniewski LA. Multicolor fluorescence biosensors reveal a burning need for diversity in the single-cell metabolic landscape. Trends Endocrinol Metab 2021; 32:537-539. [PMID: 33972177 PMCID: PMC8381684 DOI: 10.1016/j.tem.2021.04.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Accepted: 04/12/2021] [Indexed: 11/23/2022]
Abstract
Although cellular heterogeneity has been described for metabolic pathways, the upstream mechanisms, the downstream consequences, and the flexibility and transmission of these preferences to daughter cells remains largely unknown. Using live-cell imaging, Kosaisawe et al. demonstrate that cellular metabolism, determined by glycolysis and ATP, is spontaneously heterogeneous, plastic, and regulatory.
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Affiliation(s)
- Md Torikul Islam
- Department of Nutrition and Integrative Physiology, University of Utah College of Health, Salt Lake City, UT 84112, USA.
| | - William L Holland
- Department of Nutrition and Integrative Physiology, University of Utah College of Health, Salt Lake City, UT 84112, USA; Department of Biochemistry, University of Utah School of Medicine, Salt Lake City, UT 84112, USA
| | - Lisa A Lesniewski
- Department of Nutrition and Integrative Physiology, University of Utah College of Health, Salt Lake City, UT 84112, USA; Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, UT 84112, USA; Geriatric Research Education and Clinical Centers, Salt Lake City Veterans Affairs Medical Center, Salt Lake City, UT 84112, USA
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19
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Trott DW, Islam MT, Buckley DJ, Donato AJ, Dutson T, Sorensen ES, Cai J, Gogulamudi VR, Phuong TTT, Lesniewski LA. T lymphocyte depletion ameliorates age-related metabolic impairments in mice. GeroScience 2021; 43:1331-1347. [PMID: 33893902 DOI: 10.1007/s11357-021-00368-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Accepted: 04/15/2021] [Indexed: 10/21/2022] Open
Abstract
Both glucose tolerance and adaptive immune function exhibit significant age-related alterations. The influence of the immune system on obesity-associated glucose intolerance is well characterized; however, whether the immune system contributes to age-related glucose intolerance is not as well understood. Here, we report that advancing age results in an increase in T cell infiltration in the epididymal white adipose tissue (eWAT), liver, and skeletal muscle. Subtype analyses show that both CD4+, CD8+ T cells are greater with advancing age in each of these tissues and that aging results in a blunted CD4 to CD8 ratio. Anti-CD3 F(ab')2 fragments depleted CD4+ and CD8+ cells in eWAT, CD4+ cells only in the liver, and did not deplete quadriceps T cells. In old mice, T cells producing both interferon-γ and tumor necrosis factor-α are accumulated in the eWAT and liver, and a greater proportion of skeletal muscle T cells produced interferon-γ. Aging resulted in increased proportion and numbers of T regulatory cells in eWAT, but not in the liver or muscle. Aging also resulted in greater numbers of eWAT and quadriceps CD206- macrophages and eWAT, liver and quadriceps B cells; neither cell type was altered by anti-CD3 treatment. Anti-CD3 treatment improved glucose tolerance in old mice and was accompanied by improved signaling related to liver and skeletal muscle insulin utilization and decreased gluconeogenesis-related gene expression in the liver. Our findings indicate a critical role of the adaptive immune system in the age-related metabolic dysfunction.
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Affiliation(s)
- Daniel W Trott
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA.,Department of Kinesiology, University of Texas at Arlington, Arlington, TX, USA
| | - Md Torikul Islam
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
| | - David J Buckley
- Department of Kinesiology, University of Texas at Arlington, Arlington, TX, USA
| | - Anthony J Donato
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA.,Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA.,Geriatrics Research Education and Clinical Center, Veteran's Affairs Medical Center, GRECC Bldg 2 Rm 2D08, 500 Foothill Drive, Salt Lake City, UT, 84148, USA.,Department of Biochemistry, University of Utah, Salt Lake City, UT, USA
| | - Tavia Dutson
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA
| | - Eric S Sorensen
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA
| | - Jinjin Cai
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA
| | | | - Tam T T Phuong
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA
| | - Lisa A Lesniewski
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA. .,Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA. .,Geriatrics Research Education and Clinical Center, Veteran's Affairs Medical Center, GRECC Bldg 2 Rm 2D08, 500 Foothill Drive, Salt Lake City, UT, 84148, USA.
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20
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Islam MT, Hall SA, Lesniewski LA. Chronic aerobic exercise: targeting two birds with one stone. J Physiol 2020; 599:1015-1016. [PMID: 33289103 DOI: 10.1113/jp280929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Affiliation(s)
- Md Torikul Islam
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
| | - Shelby A Hall
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
| | - Lisa A Lesniewski
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA.,Division of Geriatrics, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, UT, USA.,Geriatrics Research Education and Clinical Center, Veteran's Affairs Medical Center-Salt Lake City, Salt Lake City, UT, USA
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21
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Islam MT, Henson GD, Machin DR, Bramwell RC, Donato AJ, Lesniewski LA. Aging differentially impacts vasodilation and angiogenesis in arteries from the white and brown adipose tissues. Exp Gerontol 2020; 142:111126. [PMID: 33203620 DOI: 10.1016/j.exger.2020.111126] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2020] [Revised: 10/19/2020] [Accepted: 10/20/2020] [Indexed: 01/06/2023]
Abstract
Aging adipose tissues (ATs) manifest reduced vascularity and increased hypoxia and inflammation that contribute to local and systemic metabolic dysfunction. However, the mechanisms that underlie these age-related changes are incompletely understood. In this study, we sought to examine insulin-stimulated vasodilation and angiogenesis in the arterial vasculature from three major AT depots, perigonadal white (pgWAT), subcutaneous white (scWAT) and brown (BAT) from young and old mice. Here, we demonstrate that in young mice, insulin-stimulated vasodilation is lower in feed arteries from pgWAT compared to scWAT (p < 0.05), but no differences were found between feed arteries in other AT depots (p > 0.05). Insulin-stimulated vasodilation was lower in old compared to young feed arteries from all three AT depots (p < 0.05 for all). In the presence of endothelial nitric oxide synthase inhibitor, L-NAME, insulin-stimulated vasodilation was decreased in young (p < 0.05), but was unaffected in old (p > 0.05) from all AT depots. We also observed no age-related differences in endothelium-independent dilation, as assessed by sodium nitroprusside (p > 0.05). We next investigated angiogenic capacity of the vasculature in these AT depots. In young mice, BAT vasculature demonstrated the highest angiogenic potential, followed by pgWAT and scWAT. We found that aging decreased angiogenic sprout formation in pgWAT and BAT (both p < 0.05), but increased angiogenic potential in scWAT (p < 0.05), indicating dissimilar impact of aging on angiogenesis in different AT depots. Collectively, these data suggest that aging leads to a consistent impairment in insulin-stimulated vasodilation and reduction in NO bioavailability in all three AT, although aging differentially impacts angiogenic capacity across different AT depots.
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Affiliation(s)
- Md Torikul Islam
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA
| | - Grant D Henson
- Department of Exercise and Sports Science, University of Utah, Salt Lake City, UT, USA
| | - Daniel R Machin
- Division of Geriatrics, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, UT, USA
| | - R Colton Bramwell
- Division of Geriatrics, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, UT, USA
| | - Anthony J Donato
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA; Department of Exercise and Sports Science, University of Utah, Salt Lake City, UT, USA; Division of Geriatrics, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, UT, USA; Geriatrics Research Education and Clinical Center, Veteran's Affairs Medical Center-Salt Lake City, Salt Lake City, UT, USA; Department of Biochemistry, University of Utah, Salt Lake City, UT, USA
| | - Lisa A Lesniewski
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA; Department of Exercise and Sports Science, University of Utah, Salt Lake City, UT, USA; Division of Geriatrics, Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City, UT, USA; Geriatrics Research Education and Clinical Center, Veteran's Affairs Medical Center-Salt Lake City, Salt Lake City, UT, USA.
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22
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Machin DR, Auduong Y, Gogulamudi VR, Liu Y, Islam MT, Lesniewski LA, Donato AJ. Lifelong SIRT-1 overexpression attenuates large artery stiffening with advancing age. Aging (Albany NY) 2020; 12:11314-11324. [PMID: 32564006 PMCID: PMC7343505 DOI: 10.18632/aging.103322] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Accepted: 04/28/2020] [Indexed: 01/01/2023]
Abstract
Advanced age is accompanied by aortic stiffening that is associated with decreased vascular expression of sirtuin-1 (SIRT-1). Interventions that increase SIRT-1 expression also lower age-related aortic stiffness. Therefore, we sought to determine if lifelong SIRT-1 overexpression would attenuate age-related aortic stiffening. Aortic pulse wave velocity (PWV) was assessed from 3-24 months in SIRT-1 transgenic overexpressing (SIRTTG) and wild-type (WT) mice. To determine the role of aortic structural changes on aortic stiffening, histological assessment of aortic wall characteristics was performed. Across the age range (3-24 mo), PWV was 8-17% lower in SIRTTG vs. WT (P<0.05). Moreover, the slope of age-related aortic stiffening was lower in SIRTTG vs. WT (2.1±0.2 vs. 3.8±0.3 cm/sec/mo, respectively). Aortic elastin decreased with advancing age in WT (P<0.05 old vs. young WT), but was maintained in SIRTTG mice (P>0.05). There was an age-related increase in aortic collagen, advanced glycation end products, and calcification in WT (P<0.05 old vs. young WT). However, this did not occur in SIRTTG (P>0.05). These findings indicate that lifelong SIRT-1 overexpression attenuates age-related aortic stiffening. These functional data are complemented by histological assessment, demonstrating that the deleterious changes to the aortic wall that normally occur with advancing age are prevented in SIRTTG mice.
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Affiliation(s)
- Daniel R. Machin
- University of Utah, Department of Internal Medicine, Salt Lake City, UT 84132, USA
| | - Yauling Auduong
- University of Utah, Department of Internal Medicine, Salt Lake City, UT 84132, USA
| | | | - Yu Liu
- University of Utah, Department of Internal Medicine, Salt Lake City, UT 84132, USA
| | - Md. Torikul Islam
- University of Utah, Department of Nutrition and Integrative Physiology, Salt Lake City, UT 84112, USA
| | - Lisa A. Lesniewski
- University of Utah, Department of Internal Medicine, Salt Lake City, UT 84132, USA
- University of Utah, Department of Nutrition and Integrative Physiology, Salt Lake City, UT 84112, USA
- VA Salt Lake City, GRECC, Salt Lake City, UT 84148, USA
| | - Anthony J. Donato
- University of Utah, Department of Internal Medicine, Salt Lake City, UT 84132, USA
- University of Utah, Department of Nutrition and Integrative Physiology, Salt Lake City, UT 84112, USA
- University of Utah, Department of Biochemistry, Salt Lake City, UT 84132, USA
- VA Salt Lake City, GRECC, Salt Lake City, UT 84148, USA
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Bloom SI, Islam MT, Tucker JR, Phuong T, Sorensen E, Cai J, Lesniewski LA, Donato AJ. Induction of Telomere Uncapping in Adipocytes Results in Cellular Senescence and Metabolic Dysfunction. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.03353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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24
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Bramwell RC, Bloom SI, Machin DR, Lesniewski LA, Donato AJ. Genetic Reduction of DNA Damage Repair Protein ATM Kinase Attenuates Endothelium‐Dependent Dilation and NO Bioavailability via Enhanced Superoxide in Old but not Young Mice. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.06559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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25
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Gogulamudi VR, Durrant JR, Donato AJ, Lesniewski LA. Aging exacerbates spontaneous atherosclerosis in apolipoprotein E deficient mice. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.06010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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26
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Machin DR, Auduong Y, Liu Y, Gogulamudi VR, Islam MT, Lesniewski LA, Donato AJ. Lifelong SIRT‐1 Overexpression Attenuates Aortic Stiffening with Advancing Age. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.02675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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27
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Dutson T, Islam MT, Cai J, Sun Z, Fang D, Donato AJ, Zhu W, Lesniewski LA. Arf6 Heterozygosity Results in Impaired Glucose Tolerance Due to Abberant Hepatic Gluconeogenesis. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.09478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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28
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Islam MT, Cai J, Tucker JR, Mitton J, Zhu W, Donato AJ, Lesniewski LA. Endothelial Cell‐Specific Deletion of Small GTPase ARF6 Results in Blunted Insulin‐Stimulated Vasodilation and Systemic Insulin Resistance via Arf6/Akt/eNOS Signaling Pathway. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.04569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Abstract
P2Y2, a G protein-coupled receptor (R), is expressed in all organs involved in the development of obesity and insulin resistance. To explore the role of it in diet-induced obesity, we fed male P2Y2-R whole body knockout (KO) and wild type (WT) mice (B6D2 genetic background) with regular diet (CNT; 10% calories as fat) or high-fat diet (HFD; 60% calories as fat) with free access to food and water for 16 weeks, and euthanized them. Adjusted for body weights (BW), KO mice consumed modestly, but significantly more HFD vs. WT mice, and excreted well-formed feces with no taint of fat or oil. Starting from the 2nd week, HFD-WT mice displayed significantly higher BW with terminal mean difference of 22% vs. HFD-KO mice. Terminal weights of white adipose tissue (WAT) were significantly lower in the HFD-KO vs. HFD-WT mice. The expression of P2Y2-R mRNA in WAT was increased by 2-fold in HFD-fed WT mice. Serum insulin, leptin and adiponectin levels were significantly elevated in the HFD-WT mice, but not in the HFD-KO mice. When induced in vitro, preadipocytes derived from KO mice fed regular diet did not differentiate and mature as robustly as those from the WT mice, as assessed by cellular expansion and accumulation of lipid droplets. Blockade of P2Y2-R by AR-C118925 in preadipocytes derived from WT mice prevented differentiation and maturation. Under basal conditions, KO mice had significantly higher serum triglycerides and showed slightly impaired lipid tolerance as compared to the WT mice. HFD-fed KO mice had significantly better glucose tolerance (GTT) as compared to HFD-fed WT mice. Whole body insulin sensitivity and mRNA expression of insulin receptor, IRS-1 and GLUT4 in WAT was significantly higher in HFD-fed KO mice vs. HFD-fed WT mice. On the contrary, the expression of pro-inflammatory molecules MCP-1, CCR2, CD68, and F4/80 were significantly higher in the WAT of HFD-fed WT vs. HFD-fed KO mice. These data suggest that P2Y2-R plays a significant role in the development of diet-induced obesity by promoting adipogenesis and inflammation, and altering the production of adipokines and lipids and their metabolism in adipose tissue, and thereby facilitates HFD-induced insulin resistance.
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Affiliation(s)
- Yue Zhang
- Department of Veterans Affairs Salt Lake City Health Care System, Nephrology Research, Salt Lake City, UT, United States
- Departments of Internal Medicine, University of Utah Health, Salt Lake City, UT, United States
- Jiangsu Key Laboratory of Pediatrics, Nanjing Medical University, Nanjing, China
| | - Carolyn M. Ecelbarger
- Division of Endocrinology and Metabolism, Department of Medicine, Center for the Study of Sex Differences in Health, Aging, and Disease, Georgetown University, Washington, DC, United States
| | - Lisa A. Lesniewski
- Departments of Internal Medicine, University of Utah Health, Salt Lake City, UT, United States
- Department of Veterans Affairs Salt Lake City Health Care System, Geriatric Research, Education and Clinical Center, Salt Lake City, UT, United States
- Department of Nutrition and Integrative Physiology, University of Utah Health, Salt Lake City, UT, United States
- Center on Aging, University of Utah Health, Salt Lake City, UT, United States
| | - Christa E. Müller
- PharmaCenter Bonn, Pharmaceutical Institute, Pharmaceutical and Medicinal Chemistry, University of Bonn, Bonn, Germany
| | - Bellamkonda K. Kishore
- Department of Veterans Affairs Salt Lake City Health Care System, Nephrology Research, Salt Lake City, UT, United States
- Departments of Internal Medicine, University of Utah Health, Salt Lake City, UT, United States
- Department of Nutrition and Integrative Physiology, University of Utah Health, Salt Lake City, UT, United States
- Center on Aging, University of Utah Health, Salt Lake City, UT, United States
- *Correspondence: Bellamkonda K. Kishore
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Phuong TTT, Walker AE, Henson GD, Machin DR, Li DY, Donato AJ, Lesniewski LA. Deletion of Robo4 prevents high-fat diet-induced adipose artery and systemic metabolic dysfunction. Microcirculation 2019; 26:e12540. [PMID: 30825241 DOI: 10.1111/micc.12540] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 01/22/2019] [Accepted: 02/27/2019] [Indexed: 12/25/2022]
Abstract
OBJECTIVE Accumulating evidence suggests the vascular endothelium plays a fundamental role in the pathophysiology of obesity by regulating the functional status of white adipose and systemic metabolism. Robo4 is expressed specifically in endothelial cells and increases vascular stability and inhibits angiogenesis. We sought to determine the role of Robo4 in modulating cardiometabolic function in response to high-fat feeding. METHODS We examined exercise capacity, glucose tolerance, and white adipose tissue artery gene expression, endothelium-dependent dilation (EDD), and angiogenesis in wild type and Robo4 knockout (KO) mice fed normal chow (NC) or a high-fat diet (HFD). RESULTS We found Robo4 deletion enhances exercise capacity in NC-fed mice and HFD markedly increased the expression of the Robo4 ligand, Slit2, in white adipose tissue. Deletion of Robo4 increased angiogenesis in white adipose tissue and protected against HFD-induced impairments in white adipose artery vasodilation and glucose intolerance. CONCLUSIONS We demonstrate a novel functional role for Robo4 in endothelial cell function and metabolic homeostasis in white adipose tissue, with Robo4 deletion protecting against endothelial and metabolic dysfunction associated with a HFD. Our findings suggest that Robo4-dependent signaling pathways may be a novel target in anti-obesity therapy.
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Affiliation(s)
- Tam T T Phuong
- Department of Internal Medicine, Division of Geriatrics, University of Utah, Salt Lake City, Utah
| | - Ashley E Walker
- Department of Internal Medicine, Division of Geriatrics, University of Utah, Salt Lake City, Utah
| | - Grant D Henson
- Department of Internal Medicine, Division of Geriatrics, University of Utah, Salt Lake City, Utah
| | - Daniel R Machin
- Department of Internal Medicine, Division of Geriatrics, University of Utah, Salt Lake City, Utah
| | - Dean Y Li
- Department of Medicine, Program in Molecular Medicine, University of Utah, Salt Lake City, Utah.,Division of Cardiovascular Medicine Department of Medicine, University of Utah, Salt Lake City, Utah.,Department of Human Genetics, University of Utah, Salt Lake City, Utah
| | - Anthony J Donato
- Department of Internal Medicine, Division of Geriatrics, University of Utah, Salt Lake City, Utah.,Salt Lake City Veteran's Affair Medical Center, Geriatrics Research Education and Clinic Center, Salt Lake City, Utah.,Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, Utah
| | - Lisa A Lesniewski
- Department of Internal Medicine, Division of Geriatrics, University of Utah, Salt Lake City, Utah.,Salt Lake City Veteran's Affair Medical Center, Geriatrics Research Education and Clinic Center, Salt Lake City, Utah.,Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, Utah
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31
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Gogulamudi VR, Lesniewski LA, Gates PE, Kumar A, Donato AJ. Aged endothelial cells exhibit a metabolic shift from anaerobic glycolysis to oxidative phosphorylation. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.693.14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Lisa A Lesniewski
- Department of Internal Medicine, Division of GeriatricsUniversity of UtahSalt Lake CityUT
- Department of Nutrition and Integrative PhysiologyUniversity of UtahSalt Lake CityUT
- Geriatrics Research Education and Clinical CenterVA Medical CenterSalt Lake CityUT
| | - Phillip E Gates
- Department of Internal Medicine, Division of GeriatricsUniversity of UtahSalt Lake CityUT
| | - Anil Kumar
- Metabolic Phenotyping CoreUniversity of UtahSalt Lake CityUT
| | - Anthony J Donato
- Department of Internal Medicine, Division of GeriatricsUniversity of UtahSalt Lake CityUT
- Department of Nutrition and Integrative PhysiologyUniversity of UtahSalt Lake CityUT
- Geriatrics Research Education and Clinical CenterVA Medical CenterSalt Lake CityUT
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Affiliation(s)
| | | | | | - Lisa A Lesniewski
- Internal MedicineUniversity of UtahSalt Lake CityUT
- Nutrition and Integrative PhysiologyUniversity of UtahSalt Lake CityUT
- GRECCVA Medical CenterSalt Lake CityUT
| | - Anthony J Donato
- Internal MedicineUniversity of UtahSalt Lake CityUT
- Nutrition and Integrative PhysiologyUniversity of UtahSalt Lake CityUT
- BiochemistryUniversity of UtahSalt Lake CityUT
- GRECCVA Medical CenterSalt Lake CityUT
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33
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Bloom SI, Machin DR, Bramwell RC, Lesniewski LA, Donato AJ. Genetic deletion of the DNA damage repair protein, ATM kinase, is not sufficient to induce vascular dysfunction in young mice. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.596.3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Samuel I Bloom
- Nutrition and Integrative PhysiologyUniversity of UtahSalt Lake CityUT
| | | | | | - Lisa A Lesniewski
- Nutrition and Integrative PhysiologyUniversity of UtahSalt Lake CityUT
- Internal MedicineUniversity of UtahSalt Lake CityUT
- Geriatric Research, Education, and Clinical CenterSalt Lake City Veterans Affairs Medical CenterSalt Lake CityUT
| | - Anthony J Donato
- Nutrition and Integrative PhysiologyUniversity of UtahSalt Lake CityUT
- Internal MedicineUniversity of UtahSalt Lake CityUT
- BiochemistryUniversity of UtahSalt Lake CityUT
- Geriatric Research, Education, and Clinical CenterSalt Lake City Veterans Affairs Medical CenterSalt Lake CityUT
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34
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Islam MT, Tippetts TS, Gogulamudi VR, Holland WL, Summers SA, Donato AJ, Lesniewski LA. Deletion of miR‐92a Results in Glucose Intolerance via Impaired Pancreatic Beta Cell Function. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.714.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Md Torikul Islam
- Department of Nutrition and Integrative PhysiologyUniversity of UtahSalt Lake CityUT
| | - Trevor S Tippetts
- Department of Nutrition and Integrative PhysiologyUniversity of UtahSalt Lake CityUT
| | | | - William L Holland
- Department of Nutrition and Integrative PhysiologyUniversity of UtahSalt Lake CityUT
| | - Scott A Summers
- Department of Nutrition and Integrative PhysiologyUniversity of UtahSalt Lake CityUT
| | - Anthony J Donato
- Department of Nutrition and Integrative PhysiologyUniversity of UtahSalt Lake CityUT
- Department of Internal MedicineUniversity of UtahSalt Lake CityUT
- Department of BiochemistryUniversity of UtahSalt Lake CityUT
- Geriatric Research Education and Clinical CentersSalt Lake City Veterans Affairs Medical CenterSalt Lake CityUT
| | - Lisa A Lesniewski
- Department of Nutrition and Integrative PhysiologyUniversity of UtahSalt Lake CityUT
- Department of Internal MedicineUniversity of UtahSalt Lake CityUT
- Geriatric Research Education and Clinical CentersSalt Lake City Veterans Affairs Medical CenterSalt Lake CityUT
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35
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Hazra S, Henson GD, Bramwell RC, Donato AJ, Lesniewski LA. Impact of high-fat diet on vasoconstrictor reactivity of white and brown adipose tissue resistance arteries. Am J Physiol Heart Circ Physiol 2019; 316:H485-H494. [PMID: 30550353 DOI: 10.1152/ajpheart.00278.2018] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Blood flow regulation is a critical factor for tissue oxygenation and substrate supply. Increased reactivity of arteries to vasoconstrictors may increase vascular resistance, resulting in reduced blood flow. We aimed to investigate the effect of a high-fat (HF) diet on stiffness and vasoconstrictor reactivity of white adipose tissue (WAT) and brown adipose tissue (BAT) resistance arteries and also investigated the interconversion of both adipose depots in the setting of a HF diet. Vasoconstrictor reactivity and passive morphology and mechanical properties of arteries from B6D2F1 mice (5 mo old) fed normal chow (NC) or a HF diet (8 wk) were measured using pressure myography. Receptor gene expression in WAT and BAT arteries and markers of WAT and BAT were assessed in whole tissue lysates by real-time RT-PCR. Despite greater receptor-independent vasoconstriction (in response to KCl, P < 0.01), vasoconstriction in response to angiotensin II ( P < 0.01) was lower in NC-BAT than NC-WAT arteries and similar in response to endothelin-1 ( P = 0.07) and norepinephrine ( P = 0.11) in NC-BAT and NC-WAT arteries. With the exception of BAT artery reactivity to endothelin-1 and angiotensin II, the HF diet tended to attenuate reactivity in arteries from both adipose depots and increased expression of adipose markers in BAT. No significant differences in morphology or passive mechanical properties were found between adipose types or diet conditions. Alterations in gene expression of adipose markers after the HF diet suggest beiging of BAT. An increase in brown adipocytes in the absence of increased BAT mass may be a compensatory mechanism to dissipate excess energy from a HF diet. NEW & NOTEWORTHY Despite no differences in passive mechanical properties and greater receptor-independent vasoconstriction, receptor-mediated vasoconstriction was either lower in brown than white adipose tissue arteries or similar in brown and white adipose tissue arteries. A high-fat diet has a greater impact on vasoconstrictor responses in white adipose tissue but leads to altered adipose tissue gene expression consistent with beiging of the brown adipose tissue.
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Affiliation(s)
- Sugata Hazra
- Department of Internal Medicine, University of Utah , Salt Lake City, Utah
| | - Grant D Henson
- Department of Exercise and Sport Science, University of Utah , Salt Lake City, Utah
| | - R Colton Bramwell
- Department of Internal Medicine, University of Utah , Salt Lake City, Utah
| | - Anthony J Donato
- Department of Internal Medicine, University of Utah , Salt Lake City, Utah.,Department of Exercise and Sport Science, University of Utah , Salt Lake City, Utah.,Department of Biochemistry, University of Utah , Salt Lake City, Utah.,Geriatric Research, Education, and Clinical Center, Veterans Affairs Medical Center , Salt Lake City, Utah
| | - Lisa A Lesniewski
- Department of Internal Medicine, University of Utah , Salt Lake City, Utah.,Department of Exercise and Sport Science, University of Utah , Salt Lake City, Utah.,Department of Biochemistry, University of Utah , Salt Lake City, Utah
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Walker AE, Breevoort SR, Durrant JR, Liu Y, Machin DR, Dobson PS, Nielson EI, Meza AJ, Islam MT, Donato AJ, Lesniewski LA. The pro-atherogenic response to disturbed blood flow is increased by a western diet, but not by old age. Sci Rep 2019; 9:2925. [PMID: 30814657 PMCID: PMC6393500 DOI: 10.1038/s41598-019-39466-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Accepted: 01/24/2019] [Indexed: 12/12/2022] Open
Abstract
Atherogenic remodeling often occurs at arterial locations with disturbed blood flow (i.e., low or oscillatory) and both aging and western diet (WD) increase the likelihood for pro-atherogenic remodeling. However, it is unknown if old age and/or a WD modify the pro-atherogenic response to disturbed blood flow. We induced disturbed blood flow by partial carotid ligation (PCL) of the left carotid artery in young and old, normal chow (NC) or WD fed male B6D2F1 mice. Three weeks post-PCL, ligated carotid arteries had greater intima media thickness, neointima formation, and macrophage content compared with un-ligated arteries. WD led to greater remodeling and macrophage content in the ligated artery compared with NC mice, but these outcomes were similar between young and old mice. In contrast, nitrotyrosine content, a marker of oxidative stress, did not differ between WD and NC fed mice, but was greater in old compared with young mice in both ligated and un-ligated carotid arteries. In primary vascular smooth muscle cells, aging reduced proliferation, whereas conditioned media from fatty acid treated endothelial cells increased proliferation. Taken together, these findings suggest that the remodeling and pro-inflammatory response to disturbed blood flow is increased by WD, but is not increased by aging.
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Affiliation(s)
- Ashley E Walker
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA. .,Department of Human Physiology, University of Oregon, Eugene, Oregon, USA.
| | - Sarah R Breevoort
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA
| | | | - Yu Liu
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA
| | - Daniel R Machin
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA.,Geriatrics Research Education and Clinical Center, Veteran's Affairs Medical Center, Salt Lake City, Utah, USA
| | - Parker S Dobson
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA
| | - Elizabeth I Nielson
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA
| | - Antonio J Meza
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA
| | - Md Torikul Islam
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, Utah, USA
| | - Anthony J Donato
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA.,Geriatrics Research Education and Clinical Center, Veteran's Affairs Medical Center, Salt Lake City, Utah, USA.,Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, Utah, USA
| | - Lisa A Lesniewski
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA.,Geriatrics Research Education and Clinical Center, Veteran's Affairs Medical Center, Salt Lake City, Utah, USA.,Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, Utah, USA
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37
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Walker AE, Kronquist EK, Chinen KT, Reihl KD, Li DY, Lesniewski LA, Donato AJ. Cerebral and skeletal muscle feed artery vasoconstrictor responses in a mouse model with greater large elastic artery stiffness. Exp Physiol 2019; 104:434-442. [PMID: 30633428 DOI: 10.1113/ep087453] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Accepted: 01/09/2019] [Indexed: 01/01/2023]
Abstract
NEW FINDINGS What is the central question of this study? Greater large artery stiffness is associated with dysfunctional resistance artery vasodilatory responses, impaired memory and greater risk of Alzheimer's disease. However, it is unknown whether stiffer large arteries affect cerebral and skeletal muscle feed artery responses to vasoconstrictors. What is the main finding and its importance? In a mouse model with greater large artery stiffness (Eln+/- ), we find an exacerbated vasoconstrictor response to angiotensin II in cerebral arteries, but not skeletal muscle feed arteries, thus implicating altered cerebral artery angiotensin II responsiveness in the poor brain outcomes associated with greater large artery stiffness. ABSTRACT Greater stiffness of the large elastic arteries is associated with end-organ damage and dysfunction. At the same time, resistance artery vasoconstrictor responsiveness influences vascular tone and organ blood flow. However, it is unknown whether large elastic artery stiffness modulates the responsiveness to vasoconstrictors in resistance arteries of the cerebral or skeletal muscle circulations. We previously described the elastin haploinsufficient (Eln+/- ) mouse as a model with greater aortic stiffness, but with similar cerebral and skeletal muscle feed artery stiffness to wild-type (Eln+/+ ) mice. Here, we used this model to examine the relationship between large elastic artery stiffness and resistance artery vasoconstrictor responses. In middle cerebral arteries (MCAs), vasoconstriction in response to angiotensin II (Ang II) was ∼40% greater in Eln+/- compared with Eln+/+ mice (P = 0.02), and this group difference was ameliorated by losartan, indicating a role for Ang II type 1 receptors (AT1Rs). In gastrocnemius feed arteries, Eln+/- and Eln+/+ mice did not differ in the response to Ang II. In addition, the vasoconstrictor responses to noradrenaline, endothelin-1 and potassium chloride were not different between Eln+/- and Eln+/+ mice for either MCAs or gastrocnemius feed arteries. The MCA AT1R gene expression did not differ between groups, whereas Ang II type 2 receptor gene expression was ∼50% lower in MCAs from Eln+/- versus Eln+/+ mice (P = 0.01). In conclusion, greater large elastic artery stiffness is associated with an exacerbated vasoconstriction response to Ang II in cerebral arteries, but is not associated with the responses to other vasoconstrictors in either cerebral or skeletal muscle feed arteries.
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Affiliation(s)
- Ashley E Walker
- Department of Human Physiology, University of Oregon, Eugene, OR, USA.,Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA
| | - Elise K Kronquist
- Department of Human Physiology, University of Oregon, Eugene, OR, USA
| | - Kerrick T Chinen
- Department of Human Physiology, University of Oregon, Eugene, OR, USA
| | - Kelly D Reihl
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA
| | - Dean Y Li
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA.,Program in Molecular Medicine, University of Utah, Salt Lake City, UT, USA.,Department of Human Genetics, University of Utah, Salt Lake City, UT, USA.,Department of Oncological Sciences, University of Utah, Salt Lake City, UT, USA.,The Key Laboratory for Human Disease Gene Study of Sichuan Province, Institute of Laboratory Medicine, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, Sichuan, China.,Department of Cardiology, Veteran's Affairs Medical Center, Salt Lake City, UT, USA
| | - Lisa A Lesniewski
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA.,Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA.,Geriatrics Research Education and Clinical Center, Veteran's Affairs Medical Center, Salt Lake City, UT, USA
| | - Anthony J Donato
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA.,Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA.,Geriatrics Research Education and Clinical Center, Veteran's Affairs Medical Center, Salt Lake City, UT, USA
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Morgan RG, Walker AE, Trott DW, Machin DR, Henson GD, Reihl KD, Cawthon RM, Denchi EL, Liu Y, Bloom SI, Phuong TT, Richardson RS, Lesniewski LA, Donato AJ. Induced Trf2 deletion leads to aging vascular phenotype in mice associated with arterial telomere uncapping, senescence signaling, and oxidative stress. J Mol Cell Cardiol 2018; 127:74-82. [PMID: 30502348 DOI: 10.1016/j.yjmcc.2018.11.014] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2018] [Revised: 10/18/2018] [Accepted: 11/21/2018] [Indexed: 12/19/2022]
Abstract
Age-related vascular dysfunction in large elastic and resistance arteries is associated with reductions in microvascular perfusion and elevations in blood pressure. Recent evidence indicates that telomere uncapping-induced senescence in vascular cells may be an important source of oxidative stress and vascular dysfunction in aging, but the causal relationship between these processes has yet to be elucidated. To test this important unexplored hypothesis, we measured arterial senescence signaling and oxidative stress, carotid and mesenteric artery endothelium-dependent vasodilatory capacity, markers of mesenteric microvascular perfusion and endothelial glycocalyx deterioration, and blood pressure in a novel mouse model of Cre-inducible whole body Trf2 deletion and telomere uncapping. Trf2 deletion led to a 320% increase in arterial senescence signaling (P < .05). There was a concurrent 29% and 22% reduction in peak endothelium-dependent vasodilation in carotid and mesenteric arteries, respectively, as well as a 63% reduction in mesenteric microvascular endothelial glycocalyx thickness (all P ≤ .01). Mesenteric microvascular perfusion was reduced by 8% and systolic blood pressure was increased by 9% following Trf2 deletion (both P < .05). Trf2 deletion also led to a pro-oxidative arterial phenotype characterized by increased in NADPH oxidase gene expression; a 210% increase in superoxide levels that was partly dependent on NADPH oxidase activity; and an oxidative stress mediated reduction in carotid artery vasodilation (all P ≤ .05). Collectively, our findings demonstrate that induced Trf2 deletion leads to telomere uncapping, increased senescence signaling, and oxidative stress mediated functional impairments in the vasculature similar to those seen in human aging.
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Affiliation(s)
- R Garrett Morgan
- Division of Geriatrics, Department of Internal Medicine, University of Utah School of Medicine, University of Utah, Salt Lake City, UT, USA
| | - Ashley E Walker
- Division of Geriatrics, Department of Internal Medicine, University of Utah School of Medicine, University of Utah, Salt Lake City, UT, USA; Geriatric Research, Education, and Clinical Center, George E. Wahlen Department of Veterans Affairs Medical Center, Salt Lake City, UT, USA
| | - Daniel W Trott
- Division of Geriatrics, Department of Internal Medicine, University of Utah School of Medicine, University of Utah, Salt Lake City, UT, USA; Geriatric Research, Education, and Clinical Center, George E. Wahlen Department of Veterans Affairs Medical Center, Salt Lake City, UT, USA
| | - Daniel R Machin
- Division of Geriatrics, Department of Internal Medicine, University of Utah School of Medicine, University of Utah, Salt Lake City, UT, USA; Geriatric Research, Education, and Clinical Center, George E. Wahlen Department of Veterans Affairs Medical Center, Salt Lake City, UT, USA
| | - Grant D Henson
- Division of Geriatrics, Department of Internal Medicine, University of Utah School of Medicine, University of Utah, Salt Lake City, UT, USA; Geriatric Research, Education, and Clinical Center, George E. Wahlen Department of Veterans Affairs Medical Center, Salt Lake City, UT, USA; Department of Exercise and Sport Science, University of Utah, Salt Lake City, UT, USA
| | - Kelly D Reihl
- Division of Geriatrics, Department of Internal Medicine, University of Utah School of Medicine, University of Utah, Salt Lake City, UT, USA; Geriatric Research, Education, and Clinical Center, George E. Wahlen Department of Veterans Affairs Medical Center, Salt Lake City, UT, USA
| | - Richard M Cawthon
- Department of Human Genetics, University of Utah, Salt Lake City, UT, USA
| | - Eros L Denchi
- Department of Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, CA, USA
| | - Yu Liu
- Division of Geriatrics, Department of Internal Medicine, University of Utah School of Medicine, University of Utah, Salt Lake City, UT, USA; Department of Geriatrics, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Samuel I Bloom
- Division of Geriatrics, Department of Internal Medicine, University of Utah School of Medicine, University of Utah, Salt Lake City, UT, USA
| | - Tam T Phuong
- Division of Geriatrics, Department of Internal Medicine, University of Utah School of Medicine, University of Utah, Salt Lake City, UT, USA
| | - Russell S Richardson
- Division of Geriatrics, Department of Internal Medicine, University of Utah School of Medicine, University of Utah, Salt Lake City, UT, USA; Geriatric Research, Education, and Clinical Center, George E. Wahlen Department of Veterans Affairs Medical Center, Salt Lake City, UT, USA; Department of Exercise and Sport Science, University of Utah, Salt Lake City, UT, USA
| | - Lisa A Lesniewski
- Division of Geriatrics, Department of Internal Medicine, University of Utah School of Medicine, University of Utah, Salt Lake City, UT, USA; Geriatric Research, Education, and Clinical Center, George E. Wahlen Department of Veterans Affairs Medical Center, Salt Lake City, UT, USA
| | - Anthony J Donato
- Division of Geriatrics, Department of Internal Medicine, University of Utah School of Medicine, University of Utah, Salt Lake City, UT, USA; Geriatric Research, Education, and Clinical Center, George E. Wahlen Department of Veterans Affairs Medical Center, Salt Lake City, UT, USA; Department of Biochemistry, University of Utah, Salt Lake City, UT, USA; Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, UT, USA.
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Abstract
Advancing age promotes cardiovascular disease (CVD), the leading cause of death in the United States and many developed nations. Two major age-related arterial phenotypes, large elastic artery stiffening and endothelial dysfunction, are independent predictors of future CVD diagnosis and likely are responsible for the development of CVD in older adults. Not limited to traditional CVD, these age-related changes in the vasculature also contribute to other age-related diseases that influence mammalian health span and potential life span. This review explores mechanisms that influence age-related large elastic artery stiffening and endothelial dysfunction at the tissue level via inflammation and oxidative stress and at the cellular level via Klotho and energy-sensing pathways (AMPK [AMP-activated protein kinase], SIRT [sirtuins], and mTOR [mammalian target of rapamycin]). We also discuss how long-term calorie restriction-a health span- and life span-extending intervention-can prevent many of these age-related vascular phenotypes through the prevention of deleterious alterations in these mechanisms. Lastly, we discuss emerging novel mechanisms of vascular aging, including senescence and genomic instability within cells of the vasculature. As the population of older adults steadily expands, elucidating the cellular and molecular mechanisms of vascular dysfunction with age is critical to better direct appropriate and measured strategies that use pharmacological and lifestyle interventions to reduce risk of CVD within this population.
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Affiliation(s)
- Anthony J. Donato
- University of Utah, Department of Internal Medicine, Division of Geriatrics, Salt Lake City, Utah
- Veterans Affairs Medical Center-Salt Lake City, Geriatrics Research Education and Clinical Center, Salt Lake City, Utah
| | - Daniel R. Machin
- University of Utah, Department of Internal Medicine, Division of Geriatrics, Salt Lake City, Utah
- Veterans Affairs Medical Center-Salt Lake City, Geriatrics Research Education and Clinical Center, Salt Lake City, Utah
| | - Lisa A. Lesniewski
- University of Utah, Department of Internal Medicine, Division of Geriatrics, Salt Lake City, Utah
- Veterans Affairs Medical Center-Salt Lake City, Geriatrics Research Education and Clinical Center, Salt Lake City, Utah
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Trott DW, Henson GD, Ho MHT, Allison SA, Lesniewski LA, Donato AJ. Age-related arterial immune cell infiltration in mice is attenuated by caloric restriction or voluntary exercise. Exp Gerontol 2018; 109:99-107. [PMID: 28012941 PMCID: PMC5481497 DOI: 10.1016/j.exger.2016.12.016] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Revised: 12/12/2016] [Accepted: 12/16/2016] [Indexed: 12/12/2022]
Abstract
Age-related arterial inflammation is associated with dysfunction of the arteries and increased risk for cardiovascular disease. To determine if aging increases arterial immune cell infiltration as well as the populations of immune cells principally involved, we tested the hypothesis that large elastic and resistance arteries in old mice would exhibit increased immune cell infiltration compared to young controls. Additionally, we hypothesized that vasoprotective lifestyle interventions such as lifelong caloric restriction or 8weeks of voluntary wheel running would attenuate age-related arterial immune cell infiltration. The aorta and mesenteric vasculature with surrounding perivascular adipose was excised from young normal chow (YNC, 4-6months, n=10), old normal chow (ONC, 28-29months, n=11), old caloric restricted (OCR, 28-29months, n=9), and old voluntary running (OVR, 28-29months, n=5) mice and digested to a single cell suspension. The cells were then labeled with antibodies against CD45 (total leukocytes), CD3 (pan T cells), CD4 (T helper cells), CD8 (cytotoxic T cells), CD19 (B cells), CD11b, and F4/80 (macrophages) and analyzed by flow cytometry. Total leukocytes, T cells (both CD4+ and CD8+ subsets), B cells, and macrophages in both aorta and mesentery were all 5- to 6-fold greater in ONC compared to YNC. Age-related increases in T cell (both CD4+ and CD8+), B cell, and macrophage infiltration in aorta were abolished in OCR mice. OVR mice exhibited 50% lower aortic T cell and normalized macrophage infiltration. B cell infiltration was not affected by VR. Age-related mesenteric CD8+ T cell and macrophage infiltration was normalized in OCR and OVR mice compared to young mice, whereas B cell infiltration was normalized by CR but not VR. Splenic CD4+ T cells from ONC mice exhibited a 3-fold increase in gene expression for the T helper (Th) 1 transcription factor, Tbet, and a 4-fold increase in FoxP3, a T regulatory cell transcription factor, compared to YNC. Splenic B cells and mesenteric macrophages from old mice exhibited decreased proinflammatory cytokine gene expression regardless of treatment group. These results demonstrate that aging is associated with infiltration of immune cells around both the large-elastic and resistance arteries and that the vasoprotective lifestyle interventions, CR and VR, can ameliorate age-related arterial immune cell infiltration.
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Affiliation(s)
- Daniel W Trott
- Department of Internal Medicine, Division of Geriatrics, University of Utah, Salt Lake City, UT, USA.
| | - Grant D Henson
- Department of Exercise and Sport Science, University of Utah, Salt Lake City, UT, USA
| | - Mi H T Ho
- Department of Internal Medicine, Division of Geriatrics, University of Utah, Salt Lake City, UT, USA
| | - Sheilah A Allison
- Department of Internal Medicine, Division of Geriatrics, University of Utah, Salt Lake City, UT, USA
| | - Lisa A Lesniewski
- Department of Internal Medicine, Division of Geriatrics, University of Utah, Salt Lake City, UT, USA; Department of Exercise and Sport Science, University of Utah, Salt Lake City, UT, USA; Geriatric Research, Education, and Clinical Center,Veterans Affairs Medical Center, Salt Lake City, UT, USA
| | - Anthony J Donato
- Department of Internal Medicine, Division of Geriatrics, University of Utah, Salt Lake City, UT, USA; Department of Exercise and Sport Science, University of Utah, Salt Lake City, UT, USA; Geriatric Research, Education, and Clinical Center,Veterans Affairs Medical Center, Salt Lake City, UT, USA; Department of Biochemistry,University of Utah, Salt Lake City, UT, USA
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Machin DR, Bloom SI, Campbell RA, Phuong TTT, Gates PE, Lesniewski LA, Rondina MT, Donato AJ. Advanced age results in a diminished endothelial glycocalyx. Am J Physiol Heart Circ Physiol 2018; 315:H531-H539. [PMID: 29750566 DOI: 10.1152/ajpheart.00104.2018] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Age-related microvascular dysfunction is well characterized in rodents and humans, but little is known about the properties of the microvascular endothelial glycocalyx in advanced age. We examined the glycocalyx in microvessels of young and old male C57BL6 mice (young: 6.1 ± 0.1 mo vs. old: 24.6 ± 0.2 mo) using intravital microscopy and transmission electron microscopy and in human participants (young: 29 ± 1 yr vs. old: 60 ± 2 yr) using intravital microscopy. Glycocalyx thickness in mesenteric and skeletal muscle microvessels was 51-54% lower in old compared with young mice. We also observed 33% lower glycocalyx thickness in the sublingual microcirculation of humans in advanced age. The perfused boundary region, a marker of glycocalyx barrier function, was also obtained using an automated capture and analysis system. In advanced age, we observed a 10-22% greater perfused boundary region in mice and humans, indicating a more penetrable glycocalyx. Finally, using this automated analysis system, we examined perfused microvascular density and red blood cell (RBC) fraction. Perfused microvascular density is a marker of microvascular function that reflects the length of perfused microvessel segments in a given area; RBC fraction represents the heterogeneity in RBC presence between microvessel segments. Compared with young, the perfused microvascular density was 16-21% lower and RBC fraction was 5-14% lower in older mice and in older humans. These data provide novel evidence that, across mammalian species, a diminished glycocalyx is present in advanced age and is accompanied by markers of impaired microvascular perfusion. Age-related glycocalyx deterioration may be an important contributor to microvascular dysfunction in older adults and subsequent pathophysiology. NEW & NOTEWORTHY Advanced age is characterized by microvascular dysfunction that contributes to age-related cardiovascular diseases, but little is known about endothelial glycocalyx properties in advanced age. This study reveals, for the first time, lower glycocalyx thickness and barrier function that is accompanied by impaired microvascular perfusion in both mice and humans in advanced age.
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Affiliation(s)
- Daniel R Machin
- Geriatric Research, Education, and Clinical Center, Veterans Affairs Salt Lake City, Salt Lake City, Utah.,Department of Internal Medicine, University of Utah , Salt Lake City, Utah
| | - Samuel I Bloom
- Department of Nutrition and Integrative Physiology, University of Utah , Salt Lake City, Utah
| | - Robert A Campbell
- Department of Internal Medicine, University of Utah , Salt Lake City, Utah.,Molecular Medicine, University of Utah , Salt Lake City, Utah
| | - Tam T T Phuong
- Department of Internal Medicine, University of Utah , Salt Lake City, Utah
| | - Phillip E Gates
- Department of Internal Medicine, University of Utah , Salt Lake City, Utah
| | - Lisa A Lesniewski
- Geriatric Research, Education, and Clinical Center, Veterans Affairs Salt Lake City, Salt Lake City, Utah.,Department of Internal Medicine, University of Utah , Salt Lake City, Utah.,Department of Nutrition and Integrative Physiology, University of Utah , Salt Lake City, Utah
| | - Matthew T Rondina
- Geriatric Research, Education, and Clinical Center, Veterans Affairs Salt Lake City, Salt Lake City, Utah.,Department of Internal Medicine, University of Utah , Salt Lake City, Utah.,Molecular Medicine, University of Utah , Salt Lake City, Utah
| | - Anthony J Donato
- Geriatric Research, Education, and Clinical Center, Veterans Affairs Salt Lake City, Salt Lake City, Utah.,Department of Internal Medicine, University of Utah , Salt Lake City, Utah.,Department of Nutrition and Integrative Physiology, University of Utah , Salt Lake City, Utah.,Department of Biochemistry, University of Utah , Salt Lake City, Utah
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42
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Abstract
Cardiovascular diseases (CVDs) remain the leading causes of death in the United States, and advancing age is a primary risk factor. Impaired endothelium-dependent dilation and increased stiffening of the arteries with aging are independent predictors of CVD. Increased tissue and systemic oxidative stress and inflammation underlie this age-associated arterial dysfunction. Calorie restriction (CR) is the most powerful intervention known to increase life span and improve age-related phenotypes, including arterial dysfunction. However, the translatability of long-term CR to clinical populations is limited, stimulating interest in the pursuit of pharmacological CR mimetics to reproduce the beneficial effects of CR. The energy-sensing pathways, mammalian target of rapamycin, AMPK, and sirtuin-1 have all been implicated in the beneficial effects of CR on longevity and/or physiological function and, as such, have emerged as potential targets for therapeutic intervention as CR mimetics. Although manipulation of each of these pathways has CR-like benefits on arterial function, the magnitude and/or mechanisms can be disparate from that of CR. Nevertheless, targeting these pathways in older individuals may provide some benefits against arterial dysfunction and CVD. The goal of this review is to provide a brief discussion of the mechanisms and pathways underlying age-associated dysfunction in large arteries, explain how these are impacted by CR, and to present the available evidence, suggesting that targets for energy-sensing pathways may act as vascular CR mimetics.
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Affiliation(s)
| | - Jinjin Cai
- Department of Internal Medicine-Division of Geriatrics, University of Utah , Salt Lake City, Utah
| | - Lisa A Lesniewski
- Department of Internal Medicine-Division of Geriatrics, University of Utah , Salt Lake City, Utah.,Geriatrics Research Education and Clinical Center, Veteran's Affairs Medical Center-Salt Lake City, Salt Lake City, Utah.,Department of Nutrition and Integrative Physiology, University of Utah , Salt Lake City, Utah
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43
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Zhu W, Shi DS, Winter JM, Rich BE, Tong Z, Sorensen LK, Zhao H, Huang Y, Tai Z, Mleynek TM, Yoo JH, Dunn C, Ling J, Bergquist JA, Richards JR, Jiang A, Lesniewski LA, Hartnett ME, Ward DM, Mueller AL, Ostanin K, Thomas KR, Odelberg SJ, Li DY. Small GTPase ARF6 controls VEGFR2 trafficking and signaling in diabetic retinopathy. J Clin Invest 2017; 127:4569-4582. [PMID: 29058688 DOI: 10.1172/jci91770] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Accepted: 09/07/2017] [Indexed: 12/27/2022] Open
Abstract
The devastating sequelae of diabetes mellitus include microvascular permeability, which results in retinopathy. Despite clinical and scientific advances, there remains a need for new approaches to treat retinopathy. Here, we have presented a possible treatment strategy, whereby targeting the small GTPase ARF6 alters VEGFR2 trafficking and reverses signs of pathology in 4 animal models that represent features of diabetic retinopathy and in a fifth model of ocular pathological angiogenesis. Specifically, we determined that the same signaling pathway utilizes distinct GEFs to sequentially activate ARF6, and these GEFs exert distinct but complementary effects on VEGFR2 trafficking and signal transduction. ARF6 activation was independently regulated by 2 different ARF GEFs - ARNO and GEP100. Interaction between VEGFR2 and ARNO activated ARF6 and stimulated VEGFR2 internalization, whereas a VEGFR2 interaction with GEP100 activated ARF6 to promote VEGFR2 recycling via coreceptor binding. Intervening in either pathway inhibited VEGFR2 signal output. Finally, using a combination of in vitro, cellular, genetic, and pharmacologic techniques, we demonstrated that ARF6 is pivotal in VEGFR2 trafficking and that targeting ARF6-mediated VEGFR2 trafficking has potential as a therapeutic approach for retinal vascular diseases such as diabetic retinopathy.
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Affiliation(s)
- Weiquan Zhu
- Department of Medicine, Program in Molecular Medicine.,Department of Internal Medicine, Division of Cardiovascular Medicine.,Department of Pathology, and
| | - Dallas S Shi
- Department of Medicine, Program in Molecular Medicine.,Department of Human Genetics, University of Utah, Salt Lake City, Utah, USA
| | | | - Bianca E Rich
- Department of Medicine, Program in Molecular Medicine
| | - Zongzhong Tong
- Navigen Inc., Salt Lake City, Utah, USA.,Key Laboratory for Human Disease Gene Study, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, China, China
| | | | - Helong Zhao
- Department of Medicine, Program in Molecular Medicine
| | - Yi Huang
- Key Laboratory for Human Disease Gene Study, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, China, China
| | - Zhengfu Tai
- Key Laboratory for Human Disease Gene Study, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, China, China
| | | | - Jae Hyuk Yoo
- Department of Medicine, Program in Molecular Medicine
| | | | - Jing Ling
- Department of Medicine, Program in Molecular Medicine
| | | | - Jackson R Richards
- Department of Medicine, Program in Molecular Medicine.,Department of Oncological Sciences and
| | - Amanda Jiang
- Department of Medicine, Program in Molecular Medicine
| | - Lisa A Lesniewski
- Department of Internal Medicine, Division of Geriatrics, University of Utah, Salt Lake City, Utah, USA.,Geriatric Research Education and Clinical Center, VA Salt Lake City Health Care System, Salt Lake City, Utah, USA.,Department of Nutrition and Integrative Physiology
| | | | | | | | | | - Kirk R Thomas
- Department of Medicine, Program in Molecular Medicine.,Department of Internal Medicine, Division of Hematology, and
| | - Shannon J Odelberg
- Department of Medicine, Program in Molecular Medicine.,Department of Internal Medicine, Division of Cardiovascular Medicine.,Department of Neurobiology and Anatomy, University of Utah, Salt Lake City, Utah, USA
| | - Dean Y Li
- Department of Medicine, Program in Molecular Medicine.,Department of Internal Medicine, Division of Cardiovascular Medicine.,Department of Human Genetics, University of Utah, Salt Lake City, Utah, USA.,Key Laboratory for Human Disease Gene Study, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, China, China.,Department of Oncological Sciences and.,Department of Cardiology, VA Salt Lake City Health Care System, Salt Lake City, Utah, USA
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Lesniewski LA, Seals DR, Walker AE, Henson GD, Blimline MW, Trott DW, Bosshardt GC, LaRocca TJ, Lawson BR, Zigler MC, Donato AJ. Dietary rapamycin supplementation reverses age-related vascular dysfunction and oxidative stress, while modulating nutrient-sensing, cell cycle, and senescence pathways. Aging Cell 2017; 16:17-26. [PMID: 27660040 PMCID: PMC5242306 DOI: 10.1111/acel.12524] [Citation(s) in RCA: 111] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/23/2016] [Indexed: 12/21/2022] Open
Abstract
Inhibition of mammalian target of rapamycin, mTOR, extends lifespan and reduces age-related disease. It is not known what role mTOR plays in the arterial aging phenotype or if mTOR inhibition by dietary rapamycin ameliorates age-related arterial dysfunction. To explore this, young (3.8 ± 0.6 months) and old (30.3 ± 0.2 months) male B6D2F1 mice were fed a rapamycin supplemented or control diet for 6-8 weeks. Although there were few other notable changes in animal characteristics after rapamycin treatment, we found that glucose tolerance improved in old mice, but was impaired in young mice, after rapamycin supplementation (both P < 0.05). Aging increased mTOR activation in arteries evidenced by elevated S6K phosphorylation (P < 0.01), and this was reversed after rapamycin treatment in old mice (P < 0.05). Aging was also associated with impaired endothelium-dependent dilation (EDD) in the carotid artery (P < 0.05). Rapamycin improved EDD in old mice (P < 0.05). Superoxide production and NADPH oxidase expression were higher in arteries from old compared to young mice (P < 0.05), and rapamycin normalized these (P < 0.05) to levels not different from young mice. Scavenging superoxide improved carotid artery EDD in untreated (P < 0.05), but not rapamycin-treated, old mice. While aging increased large artery stiffness evidenced by increased aortic pulse-wave velocity (PWV) (P < 0.01), rapamycin treatment reduced aortic PWV (P < 0.05) and collagen content (P < 0.05) in old mice. Aortic adenosine monophosphate-activated protein kinase (AMPK) phosphorylation and expression of the cell cycle-related proteins PTEN and p27kip were increased with rapamycin treatment in old mice (all P < 0.05). Lastly, aging resulted in augmentation of the arterial senescence marker, p19 (P < 0.05), and this was ameliorated by rapamycin treatment (P < 0.05). These results demonstrate beneficial effects of rapamycin treatment on arterial function in old mice and suggest these improvements are associated with reduced oxidative stress, AMPK activation and increased expression of proteins involved in the control of the cell cycle.
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Affiliation(s)
- Lisa A. Lesniewski
- Division of Geriatrics; Department of Internal Medicine; Salt Lake City UT USA
- Veteran's Affairs Medical Center-Salt Lake City; Geriatrics Research Education and Clinical Center; Salt Lake City UT USA
- Department of Exercise and Sports Science; University of Utah; Salt Lake City UT USA
| | - Douglas R. Seals
- Department of Integrative Physiology; University of Colorado Boulder; Boulder CO USA
| | - Ashley E. Walker
- Division of Geriatrics; Department of Internal Medicine; Salt Lake City UT USA
| | - Grant D. Henson
- Department of Exercise and Sports Science; University of Utah; Salt Lake City UT USA
| | - Mark W. Blimline
- Department of Integrative Physiology; University of Colorado Boulder; Boulder CO USA
| | - Daniel W. Trott
- Division of Geriatrics; Department of Internal Medicine; Salt Lake City UT USA
| | - Gary C. Bosshardt
- Division of Geriatrics; Department of Internal Medicine; Salt Lake City UT USA
| | - Thomas J. LaRocca
- Department of Integrative Physiology; University of Colorado Boulder; Boulder CO USA
| | - Brooke R. Lawson
- Department of Integrative Physiology; University of Colorado Boulder; Boulder CO USA
| | - Melanie C. Zigler
- Department of Integrative Physiology; University of Colorado Boulder; Boulder CO USA
| | - Anthony J. Donato
- Division of Geriatrics; Department of Internal Medicine; Salt Lake City UT USA
- Veteran's Affairs Medical Center-Salt Lake City; Geriatrics Research Education and Clinical Center; Salt Lake City UT USA
- Department of Exercise and Sports Science; University of Utah; Salt Lake City UT USA
- Department of Biochemistry; University of Utah; Salt Lake City UT USA
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Hazra S, Henson GD, Morgan RG, Breevoort SR, Ives SJ, Richardson RS, Donato AJ, Lesniewski LA. Experimental reduction of miR-92a mimics arterial aging. Exp Gerontol 2016; 83:165-70. [PMID: 27523918 DOI: 10.1016/j.exger.2016.08.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Revised: 06/28/2016] [Accepted: 08/10/2016] [Indexed: 10/21/2022]
Abstract
MicroRNAs (miRs) are small non-coding RNAs that are important regulators of aging and cardiovascular diseases. MiR-92a is important in developmental vascular growth and tumorigenesis and two of its putative targets, tumor necrosis factor alpha receptor 1 (TNFR1) and collagen type 1, play a role in age-related arterial dysfunction. We hypothesized that reduced miR-92a expression contributes to age-related arterial dysfunction characterized by endothelial dysfunction and increased large artery stiffness. MiR-92a is reduced 39% (RT-PCR, p<0.05) in arteries of older adults compared to young adults. Similarly, there was a 40% reduction in miR-92a in aortas of old (29months, n=13) compared to young (6months, n=11) B6D2F1 mice, an established model of vascular aging. To determine if reduced miR-92a contributes to arterial dysfunction; miR-92a was inhibited in vivo in young mice using antagomirs (I.P., 4wks). Antagomir treatment was associated with a concomitant 48% increase in TNFR1 (Western blot, p<0.05), 19% increase in type 1 collagen (immunohistochemistry, p<0.01), and a reduction in endothelial dependent dilation (max dilation: 93±1 vs. 73±5%, p<0.01) in response to acetylcholine (ACh, 10(-9) to 10(-4)M). Treatment with the nitric oxide (NO) synthase inhibitor, L-NAME (10(-4)M), revealed that impaired ACh dilation after antagomir treatment resulted from reduced NO bioavailability. Inhibition of miR-92a also increased arterial stiffness (pulse wave velocity, 309±13 vs. 484±52cm/s, p<0.05). Together, these results suggest that experimental reductions in arterial miR-92a partially mimic the arterial aging phenotype and we speculate that modulating miR-92a may provide a therapeutic strategy to improve age-related arterial dysfunction.
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Affiliation(s)
- Sugata Hazra
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, United States
| | - Grant D Henson
- Department of Exercise and Sport Science, University of Utah, Salt Lake City, UT, United States
| | - R Garrett Morgan
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, United States
| | - Sarah R Breevoort
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, United States
| | - Stephen J Ives
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, United States; Department of Exercise and Sport Science, University of Utah, Salt Lake City, UT, United States; Veteran's Affairs Medical Center-Salt Lake City, Geriatrics Research and Clinical Center, Salt Lake City, UT, United States
| | - Russell S Richardson
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, United States; Department of Exercise and Sport Science, University of Utah, Salt Lake City, UT, United States; Veteran's Affairs Medical Center-Salt Lake City, Geriatrics Research and Clinical Center, Salt Lake City, UT, United States
| | - Anthony J Donato
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, United States; Department of Exercise and Sport Science, University of Utah, Salt Lake City, UT, United States; Department of Biochemistry, University of Utah, Salt Lake City, UT, United States; Veteran's Affairs Medical Center-Salt Lake City, Geriatrics Research and Clinical Center, Salt Lake City, UT, United States
| | - Lisa A Lesniewski
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, United States; Department of Exercise and Sport Science, University of Utah, Salt Lake City, UT, United States; Veteran's Affairs Medical Center-Salt Lake City, Geriatrics Research and Clinical Center, Salt Lake City, UT, United States.
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Donato AJ, Morgan RG, Walker AE, Lesniewski LA. Cellular and molecular biology of aging endothelial cells. J Mol Cell Cardiol 2015; 89:122-35. [PMID: 25655936 PMCID: PMC4522407 DOI: 10.1016/j.yjmcc.2015.01.021] [Citation(s) in RCA: 317] [Impact Index Per Article: 35.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Revised: 01/05/2015] [Accepted: 01/27/2015] [Indexed: 12/29/2022]
Abstract
Cardiovascular disease (CVD) is the leading cause of death in the United States and aging is a major risk factor for CVD development. One of the major age-related arterial phenotypes thought to be responsible for the development of CVD in older adults is endothelial dysfunction. Endothelial function is modulated by traditional CVD risk factors in young adults, but advancing age is independently associated with the development of vascular endothelial dysfunction. This endothelial dysfunction results from a reduction in nitric oxide bioavailability downstream of endothelial oxidative stress and inflammation that can be further modulated by traditional CVD risk factors in older adults. Greater endothelial oxidative stress with aging is a result of augmented production from the intracellular enzymes NADPH oxidase and uncoupled eNOS, as well as from mitochondrial respiration in the absence of appropriate increases in antioxidant defenses as regulated by relevant transcription factors, such as FOXO. Interestingly, it appears that NFkB, a critical inflammatory transcription factor, is sensitive to this age-related endothelial redox change and its activation induces transcription of pro-inflammatory cytokines that can further suppress endothelial function, thus creating a vicious feed-forward cycle. This review will discuss the two macro-mechanistic processes, oxidative stress and inflammation, that contribute to endothelial dysfunction with advancing age as well as the cellular and molecular events that lead to the vicious cycle of inflammation and oxidative stress in the aged endothelium. Other potential mediators of this pro-inflammatory endothelial phenotype are increases in immune or senescent cells in the vasculature. Of note, genomic instability, telomere dysfunction or DNA damage has been shown to trigger cell senescence via the p53/p21 pathway and result in increased inflammatory signaling in arteries from older adults. This review will discuss the current state of knowledge regarding the emerging concepts of senescence and genomic instability as mechanisms underlying oxidative stress and inflammation in the aged endothelium. Lastly, energy sensitive/stress resistance pathways (SIRT-1, AMPK, mTOR) are altered in endothelial cells and/or arteries with aging and these pathways may modulate endothelial function via key oxidative stress and inflammation-related transcription factors. This review will also discuss what is known about the role of "energy sensing" longevity pathways in modulating endothelial function with advancing age. With the growing population of older adults, elucidating the cellular and molecular mechanisms of endothelial dysfunction with age is critical to establishing appropriate and measured strategies to utilize pharmacological and lifestyle interventions aimed at alleviating CVD risk. This article is part of a Special Issue entitled "SI: CV Aging".
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Affiliation(s)
- Anthony J Donato
- University of Utah, Department of Internal Medicine, Division of Geriatrics, Salt Lake City, UT, USA; Veteran's Affairs Medical Center-Salt Lake City, Geriatrics Research Education and Clinical Center, Salt Lake City, UT, USA.
| | - R Garrett Morgan
- University of Washington, Department of Pathology, Seattle, WA, USA
| | - Ashley E Walker
- University of Utah, Department of Internal Medicine, Division of Geriatrics, Salt Lake City, UT, USA
| | - Lisa A Lesniewski
- University of Utah, Department of Internal Medicine, Division of Geriatrics, Salt Lake City, UT, USA; Veteran's Affairs Medical Center-Salt Lake City, Geriatrics Research Education and Clinical Center, Salt Lake City, UT, USA
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Walker AE, Morgan RG, Ives SJ, Cawthon RM, Andtbacka RHI, Noyes D, Lesniewski LA, Richardson RS, Donato AJ. Age-related arterial telomere uncapping and senescence is greater in women compared with men. Exp Gerontol 2015; 73:65-71. [PMID: 26602606 DOI: 10.1016/j.exger.2015.11.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Revised: 11/09/2015] [Accepted: 11/17/2015] [Indexed: 01/13/2023]
Abstract
Telomere uncapping increases with advancing age in human arteries and this telomere uncapping is associated with increased markers of senescence, independent of mean telomere length. However, whether there are sex specific differences in arterial telomere uncapping is unknown. We found that telomere uncapping (serine 139 phosphorylated histone γ-H2A.X in telomeres) in arteries was ~2.5 fold greater in post-menopausal women (n=17, 63±2 years) compared with pre-menopausal women (n=11, 30±2 years, p=0.02), while there was only a trend towards greater telomere uncapping in older men (n=26, 66±2 years) compared with young men (n=11, 31±2, p=0.11). Senescence markers, p53 bound to the p21 gene promoter and p21 gene expression, were 3-4 fold greater in post-menopausal compared with pre-menopausal women (p=0.01-0.02), but only 1.5-2 fold greater in older compared with young men (p=0.02-0.08). Blood glucose was related to telomere uncapping in women, while systolic blood pressure, pulse pressure and serum creatinine were related to telomere uncapping in men. Mean arterial telomere length decreased similarly in women and men with age (p<0.01). Thus, the age-related increase in arterial telomere uncapping and senescence is greater in women than men, despite similar age-related reductions in mean telomere length in both sexes.
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Affiliation(s)
- Ashley E Walker
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA
| | - R Garrett Morgan
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA; Research Department, Navy Experimental Diving Unit, Panama City, FL, USA
| | - Stephen J Ives
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA; Department of Exercise and Sport Science, University of Utah, Salt Lake City, UT, USA; Geriatric Research, Education, and Clinical Center, Veteran's Affairs Medical Center, Salt Lake City, UT, USA; Health and Exercise Sciences Department, Skidmore College, Saratoga Springs, NY, USA
| | - Richard M Cawthon
- Department of Human Genetics, University of Utah, Salt Lake City, UT, USA
| | | | - Dirk Noyes
- Department of Surgery, University of Utah, Salt Lake City, UT, USA
| | - Lisa A Lesniewski
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA; Department of Exercise and Sport Science, University of Utah, Salt Lake City, UT, USA; Geriatric Research, Education, and Clinical Center, Veteran's Affairs Medical Center, Salt Lake City, UT, USA
| | - Russell S Richardson
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA; Department of Exercise and Sport Science, University of Utah, Salt Lake City, UT, USA; Geriatric Research, Education, and Clinical Center, Veteran's Affairs Medical Center, Salt Lake City, UT, USA
| | - Anthony J Donato
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA; Department of Exercise and Sport Science, University of Utah, Salt Lake City, UT, USA; Geriatric Research, Education, and Clinical Center, Veteran's Affairs Medical Center, Salt Lake City, UT, USA.
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48
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Gibson CC, Davis CT, Zhu W, Bowman-Kirigin JA, Walker AE, Tai Z, Thomas KR, Donato AJ, Lesniewski LA, Li DY. Dietary Vitamin D and Its Metabolites Non-Genomically Stabilize the Endothelium. PLoS One 2015; 10:e0140370. [PMID: 26469335 PMCID: PMC4607301 DOI: 10.1371/journal.pone.0140370] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Accepted: 09/24/2015] [Indexed: 12/19/2022] Open
Abstract
Vitamin D is a known modulator of inflammation. Native dietary vitamin D3 is thought to be bio-inactive, and beneficial vitamin D3 effects are thought to be largely mediated by the metabolite 1,25(OH)2D3. Reduced serum levels of the most commonly measured precursor metabolite, 25(OH)D3, is linked to an increased risk of multiple inflammatory diseases, including: cardiovascular disease, arthritis, multiple sclerosis, and sepsis. Common to all of these diseases is the disruption of endothelial stability and an enhancement of vascular leak. We previously performed an unbiased chemical suppressor screen on a genetic model of vascular instability, and identified cholecalciferol (D3, dietary Vitamin D3) as a factor that had profound and immediate stabilizing and therapeutic effects in that model. In this manuscript we show that the presumed inactive sterol, D3, is actually a potent and general mediator of endothelial stability at physiologically relevant concentrations. We further demonstrate that this phenomenon is apparent in vitamin D3 metabolites 25(OH)D3 and 1,25(OH)2D3, and that the effects are independent of the canonical transcription-mediated vitamin D pathway. Our data suggests the presence of an alternative signaling modality by which D3 acts directly on endothelial cells to prevent vascular leak. The finding that D3 and its metabolites modulate endothelial stability may help explain the clinical correlations between low serum vitamin D levels and the many human diseases with well-described vascular dysfunction phenotypes.
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Affiliation(s)
- Christopher C. Gibson
- Program in Molecular Medicine, University of Utah, Salt Lake City, Utah, 84112, United States of America
- Department of Bioengineering, University of Utah, Salt Lake City, Utah, 84112, United States of America
- Recursion Pharmaceuticals, LLC, Salt Lake City, Utah, 84108, United States of America
| | - Chadwick T. Davis
- Program in Molecular Medicine, University of Utah, Salt Lake City, Utah, 84112, United States of America
- Recursion Pharmaceuticals, LLC, Salt Lake City, Utah, 84108, United States of America
- Department of Human Genetics, University of Utah, Salt Lake City, Utah, 84112, United States of America
| | - Weiquan Zhu
- Program in Molecular Medicine, University of Utah, Salt Lake City, Utah, 84112, United States of America
| | - Jay A. Bowman-Kirigin
- Program in Molecular Medicine, University of Utah, Salt Lake City, Utah, 84112, United States of America
| | - Ashley E. Walker
- Division of Geriatrics, Department of Medicine, University of Utah, Salt Lake City, Utah, 84112, United States of America
| | - Zhengfu Tai
- The Key Laboratory for Human Disease Gene Study of Sichuan Province, Institute of Laboratory Medicine, Sichuan Academy of Medical Sciences & Sichuan Provincial People’s Hospital, Chengdu, Sichuan, 610072, China
| | - Kirk R. Thomas
- Program in Molecular Medicine, University of Utah, Salt Lake City, Utah, 84112, United States of America
- Recursion Pharmaceuticals, LLC, Salt Lake City, Utah, 84108, United States of America
| | - Anthony J. Donato
- Division of Geriatrics, Department of Medicine, University of Utah, Salt Lake City, Utah, 84112, United States of America
| | - Lisa A. Lesniewski
- Division of Geriatrics, Department of Medicine, University of Utah, Salt Lake City, Utah, 84112, United States of America
| | - Dean Y. Li
- Program in Molecular Medicine, University of Utah, Salt Lake City, Utah, 84112, United States of America
- Recursion Pharmaceuticals, LLC, Salt Lake City, Utah, 84108, United States of America
- Department of Human Genetics, University of Utah, Salt Lake City, Utah, 84112, United States of America
- The Key Laboratory for Human Disease Gene Study of Sichuan Province, Institute of Laboratory Medicine, Sichuan Academy of Medical Sciences & Sichuan Provincial People’s Hospital, Chengdu, Sichuan, 610072, China
- Division of Cardiology, Department of Medicine, University of Utah, Salt Lake City, Utah, 84112, United States of America
- Department of Oncological Sciences, University of Utah, Salt Lake City, Utah, 84112, United States of America
- Cardiology Section, VA Salt Lake City Health Care System, Salt Lake City, Utah, 84112, United States of America
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Kishore BK, Henson GD, Zhang Y, Carlson NG, Lesniewski LA, Donato AJ. Genetic Deletion of P2Y
2
Receptor Induces Vascular Endothelial Dysfunction but not Large Artery Stiffening in Mice. FASEB J 2015. [DOI: 10.1096/fasebj.29.1_supplement.803.5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- B K Kishore
- Internal MedicineUniv. of Utah & VAMCSalt Lake CityUTUnited States
| | - GD Henson
- Exercise and Sport Medicine Univ. of Utah & VAMCSalt Lake CityUTUnited States
| | - Y Zhang
- Internal MedicineUniv. of Utah & VAMCSalt Lake CityUTUnited States
| | - NG Carlson
- Neurobiology & AnatomyUniv. of Utah & VAMCSalt Lake CityUTUnited States
| | - LA Lesniewski
- Exercise and Sport Medicine Univ. of Utah & VAMCSalt Lake CityUTUnited States
| | - A J Donato
- Exercise and Sport Medicine Univ. of Utah & VAMCSalt Lake CityUTUnited States
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Walker AE, Henson GD, Reihl KD, Morgan RG, Dobson PS, Nielson EI, Ling J, Mecham RP, Li DY, Lesniewski LA, Donato AJ. Greater impairments in cerebral artery compared with skeletal muscle feed artery endothelial function in a mouse model of increased large artery stiffness. J Physiol 2015; 593:1931-43. [PMID: 25627876 DOI: 10.1113/jphysiol.2014.285338] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2014] [Accepted: 01/21/2015] [Indexed: 12/19/2022] Open
Abstract
KEY POINTS Increased large artery stiffness is a hallmark of arterial dysfunction with advancing age and is also present in other disease conditions such as diabetes. Increased large artery stiffness is correlated with resistance artery dysfunction in humans. Using a mouse model of altered arterial elastin content, this is the first study to examine the cause-and-effect relationship between large artery stiffness and peripheral resistance artery function. Our results indicate that mice with genetically greater large artery stiffness have impaired cerebral artery endothelial function, but generally preserved skeletal muscle feed artery endothelial function. The mechanisms for impaired cerebral artery endothelial function are reduced nitric oxide bioavailability and increased oxidative stress. These findings suggest that interventions that target large artery stiffness may be important to reduce disease risk associated with cerebral artery dysfunction in conditions such as advancing age. ABSTRACT Advancing age as well as diseases such as diabetes are characterized by both increased large artery stiffness and impaired peripheral artery function. It has been hypothesized that greater large artery stiffness causes peripheral artery dysfunction; however, a cause-and-effect relationship has not previously been established. We used elastin heterozygote mice (Eln(+/-) ) as a model of increased large artery stiffness without co-morbidities unrelated to the large artery properties. Aortic stiffness, measured by pulse wave velocity, was ∼35% greater in Eln(+/-) mice than in wild-type (Eln(+/+) ) mice (P = 0.04). Endothelium-dependent dilatation (EDD), assessed by the maximal dilatation to acetylcholine, was ∼40% lower in Eln(+/-) than Eln(+/+) mice in the middle cerebral artery (MCA, P < 0.001), but was similar between groups in the gastrocnemius feed arteries (GFA, P = 0.79). In the MCA, EDD did not differ between groups after incubation with the nitric oxide (NO) synthase inhibitor N(ω) -nitro-l-arginine methyl ester (P > 0.05), indicating that lower NO bioavailability contributed to the impaired EDD in Eln(+/-) mice. Superoxide production and content of the oxidative stress marker nitrotyrosine was higher in MCAs from Eln(+/-) compared with Eln(+/+) mice (P < 0.05). In the MCA, after incubation with the superoxide scavenger TEMPOL, maximal EDD improved by ∼65% in Eln(+/-) (P = 0.002), but was unchanged in Eln(+/+) mice (P = 0.17). These results indicate that greater large artery stiffness has a more profound effect on endothelial function in cerebral arteries compared with skeletal muscle feed arteries. Greater large artery stiffness can cause cerebral artery endothelial dysfunction by reducing NO bioavailability and increasing oxidative stress.
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Affiliation(s)
- Ashley E Walker
- Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA
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