151
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Lähteenvuo J, Ylä-Herttuala S. Advances and Challenges in Cardiovascular Gene Therapy. Hum Gene Ther 2017; 28:1024-1032. [PMID: 28810808 DOI: 10.1089/hum.2017.129] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Many promising cardiovascular gene therapy approaches have failed to fulfill expectations in clinical trials. However, 20 years of research and method development has laid a solid groundwork for future therapies, and the need for new treatment options still exists. The safety of gene therapy has been established with various viral vectors, transgenes and delivery methods. Improving success in clinical settings requires careful consideration of the translational process. This requires both improving animal models and preclinical end points, and new approach in patient recruitment and selection of clinical end points. This review focuses on bidirectional translationality from bench to bedside and back and proposes ways to improve the process. Developing a highly complex new therapy has taken an enormous amount of work and resources, but perhaps now after the hard lessons cardiovascular gene therapy is ready become a clinical reality.
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Affiliation(s)
- Johanna Lähteenvuo
- 1 A.I. Virtanen Institute, University of Eastern Finland, Kuopio, Finland
| | - Seppo Ylä-Herttuala
- 1 A.I. Virtanen Institute, University of Eastern Finland, Kuopio, Finland .,2 Heart Center and Gene Therapy Unit, Kuopio University Hospital , Kuopio, Finland
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152
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The Aging Cardiovascular System. J Am Coll Cardiol 2017; 69:1952-1967. [DOI: 10.1016/j.jacc.2017.01.064] [Citation(s) in RCA: 304] [Impact Index Per Article: 43.4] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 01/23/2017] [Accepted: 01/24/2017] [Indexed: 12/31/2022]
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153
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Cai W, Zhang K, Li P, Zhu L, Xu J, Yang B, Hu X, Lu Z, Chen J. Dysfunction of the neurovascular unit in ischemic stroke and neurodegenerative diseases: An aging effect. Ageing Res Rev 2017; 34:77-87. [PMID: 27697546 PMCID: PMC5384332 DOI: 10.1016/j.arr.2016.09.006] [Citation(s) in RCA: 177] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Revised: 08/15/2016] [Accepted: 09/26/2016] [Indexed: 12/23/2022]
Abstract
Current understanding on the mechanisms of brain injury and neurodegeneration highlights an appreciation of multicellular interactions within the neurovascular unit (NVU), which include the evolution of blood-brain barrier (BBB) damage, neuronal cell death or degeneration, glial reaction, and immune cell infiltration. Aging is an important factor that influences the integrity of the NVU. The age-related physiological or pathological changes in the cellular components of the NVU have been shown to increase the vulnerability of the NVU to ischemia/reperfusion injury or neurodegeneration, and to result in deteriorated brain damage. This review describes the impacts of aging on each NVU component and discusses the mechanisms by which aging increases NVU sensitivity to stroke and neurodegenerative diseases. Prophylactic or therapeutic perspectives that may delay or diminish aging and thus prevent the incidence of these neurological disorders will also be reviewed.
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Affiliation(s)
- Wei Cai
- Geriatric Research, Education and Clinical Center, Veterans Affairs Pittsburgh Health Care System, Pittsburgh, PA 15261, USA; Department of Neurology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, 510630, China; Pittsburgh Institute of Brain Disorders and Recovery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA
| | - Kai Zhang
- Geriatric Research, Education and Clinical Center, Veterans Affairs Pittsburgh Health Care System, Pittsburgh, PA 15261, USA; Pittsburgh Institute of Brain Disorders and Recovery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA
| | - Peiying Li
- Department of Anesthesiology, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200127, China; Pittsburgh Institute of Brain Disorders and Recovery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA
| | - Ling Zhu
- Geriatric Research, Education and Clinical Center, Veterans Affairs Pittsburgh Health Care System, Pittsburgh, PA 15261, USA; Department of Anesthesiology, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200127, China; Pittsburgh Institute of Brain Disorders and Recovery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA
| | - Jing Xu
- Geriatric Research, Education and Clinical Center, Veterans Affairs Pittsburgh Health Care System, Pittsburgh, PA 15261, USA; Pittsburgh Institute of Brain Disorders and Recovery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA
| | - Boyu Yang
- Geriatric Research, Education and Clinical Center, Veterans Affairs Pittsburgh Health Care System, Pittsburgh, PA 15261, USA; Pittsburgh Institute of Brain Disorders and Recovery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA
| | - Xiaoming Hu
- Geriatric Research, Education and Clinical Center, Veterans Affairs Pittsburgh Health Care System, Pittsburgh, PA 15261, USA; Pittsburgh Institute of Brain Disorders and Recovery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA
| | - Zhengqi Lu
- Department of Neurology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, 510630, China.
| | - Jun Chen
- Geriatric Research, Education and Clinical Center, Veterans Affairs Pittsburgh Health Care System, Pittsburgh, PA 15261, USA; Pittsburgh Institute of Brain Disorders and Recovery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA.
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154
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Hu X, De Silva TM, Chen J, Faraci FM. Cerebral Vascular Disease and Neurovascular Injury in Ischemic Stroke. Circ Res 2017; 120:449-471. [PMID: 28154097 PMCID: PMC5313039 DOI: 10.1161/circresaha.116.308427] [Citation(s) in RCA: 256] [Impact Index Per Article: 36.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Revised: 10/13/2016] [Accepted: 10/26/2016] [Indexed: 12/13/2022]
Abstract
The consequences of cerebrovascular disease are among the leading health issues worldwide. Large and small cerebral vessel disease can trigger stroke and contribute to the vascular component of other forms of neurological dysfunction and degeneration. Both forms of vascular disease are driven by diverse risk factors, with hypertension as the leading contributor. Despite the importance of neurovascular disease and subsequent injury after ischemic events, fundamental knowledge in these areas lag behind our current understanding of neuroprotection and vascular biology in general. The goal of this review is to address select key structural and functional changes in the vasculature that promote hypoperfusion and ischemia, while also affecting the extent of injury and effectiveness of therapy. In addition, as damage to the blood-brain barrier is one of the major consequences of ischemia, we discuss cellular and molecular mechanisms underlying ischemia-induced changes in blood-brain barrier integrity and function, including alterations in endothelial cells and the contribution of pericytes, immune cells, and matrix metalloproteinases. Identification of cell types, pathways, and molecules that control vascular changes before and after ischemia may result in novel approaches to slow the progression of cerebrovascular disease and lessen both the frequency and impact of ischemic events.
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Affiliation(s)
- Xiaoming Hu
- Center of Cerebrovascular Disease Research, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213
| | - T. Michael De Silva
- Biomedicine Discovery Institute, Department of Pharmacology, 9 Ancora Imparo Way, Monash University, Clayton, Vic, Australia
| | - Jun Chen
- Center of Cerebrovascular Disease Research, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213
| | - Frank M. Faraci
- Departments of Internal Medicine and Pharmacology, Carver College of Medicine, University of Iowa, Iowa City Veterans Affairs Healthcare System, Iowa City, IA, USA
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155
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Function, Role, and Clinical Application of MicroRNAs in Vascular Aging. BIOMED RESEARCH INTERNATIONAL 2016; 2016:6021394. [PMID: 28097140 PMCID: PMC5209603 DOI: 10.1155/2016/6021394] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Revised: 11/07/2016] [Accepted: 11/23/2016] [Indexed: 01/31/2023]
Abstract
Vascular aging, a specific type of organic aging, is related to age-dependent changes in the vasculature, including atherosclerotic plaques, arterial stiffness, fibrosis, and increased intimal thickening. Vascular aging could influence the threshold, process, and severity of various cardiovascular diseases, thus making it one of the most important risk factors in the high mortality of cardiovascular diseases. As endothelial cells (ECs) and vascular smooth muscle cells (VSMCs) are the main cell biological basis of these pathology changes of the vasculature, the structure and function of ECs and VSMCs play a key role in vascular aging. MicroRNAs (miRNAs), small noncoding RNAs, have been shown to regulate the expression of multiple messenger RNAs (mRNAs) posttranscriptionally, contributing to many crucial aspects of cell biology. Recently, miRNAs with functions associated with aging or aging-related diseases have been studied. In this review, we will summarize the reported role of miRNAs in the process of vascular aging with special emphasis on EC and VSMC functions. In addition, the potential application of miRNAs to clinical practice for the diagnosis and treatment of cardiovascular diseases will also be discussed.
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156
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Gupta R, M. Moore J, Adeeb N, Griessenauer CJ, Patel AS, Chua MH, Thomas AJ, Ogilvy CS. Clinical presentation, progression, and treatment outcomes of moyamoya disease in the elderly. Acta Neurochir (Wien) 2016; 158:2409-2414. [PMID: 27757556 DOI: 10.1007/s00701-016-2993-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Accepted: 10/06/2016] [Indexed: 10/20/2022]
Abstract
BACKGROUND Moyamoya disease is a vascular disorder characterized by progressive stenosis of the internal carotid artery. The presentation, progression, treatment options, and post-operative clinical outcomes for elderly (60 and older) Moyamoya patients have never been reported. METHODS A retrospective analysis of all patients who were diagnosed with Moyamoya disease by the senior authors between 1991 and 2016 was performed. Patients who were 60 years or older at the time of surgery or last follow-up were further evaluated. RESULTS Seventy patients were diagnosed with probable or definite Moyamoya disease during the study period (1991-2016). Eight patients (11.4 %; six females: two males; median age 63; range, 60-71 years) were found to be 60 years or older at the time of surgery or last follow-up and were included in the study. All patients had a modified Rankin scale (mRS) of either one or two (median 1) pre-operatively. Six patients (75 %) underwent surgical treatment on a total on seven hemispheres. Post-surgery, one patient had an improved mRS score, three had no changes, and two had worsening in their mRS scores. Both patients who did not undergo surgical interventions suffered from intra-parenchymal hemorrhages post-diagnosis. CONCLUSIONS Moyamoya disease is most commonly seen in young and middle-aged patients. Presentation in the elderly (defined as 60 years and older in this study) is rare, and has never been reported in the literature. In this study, both direct and indirect revascularization procedures demonstrated potential benefit in some of these patients, with stabilization of progressive symptoms.
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157
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Sweat RS, Sloas DC, Stewart SA, Czarny-Ratajczak M, Baddoo M, Eastwood JR, Suarez-Martinez AD, Azimi MS, Burks HE, Chedister LO, Myers L, Murfee WL. Aging is associated with impaired angiogenesis, but normal microvascular network structure, in the rat mesentery. Am J Physiol Heart Circ Physiol 2016; 312:H275-H284. [PMID: 27864233 DOI: 10.1152/ajpheart.00200.2016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Revised: 10/04/2016] [Accepted: 10/20/2016] [Indexed: 01/22/2023]
Abstract
A big problem associated with aging is thought to be impaired microvascular growth or angiogenesis. However, to link the evidence for impaired angiogenesis to microvascular dysfunction in aged tissues, we must compare adult vs. aged microvascular networks in unstimulated scenarios. The objective of this study was to test the hypothesis that aged microvascular networks are characterized by both fewer vessels and the impaired ability to undergo angiogenesis. Mesentery tissues from adult (9-mo) and aged (24-mo) male Fischer 344 rats were harvested and immunolabeled for platelet/endothelial cell adhesion molecule (an endothelial cell marker) according to two scenarios: unstimulated and stimulated. For unstimulated groups, tissues harvested from adult and aged rats were compared. For stimulated groups, tissues were harvested 3 or 10 days after compound 48/80-induced mast cell degranulation stimulation. Unstimulated aged microvascular networks displayed larger mean vascular area per tissue area compared with the unstimulated adult networks. The lack of a decrease in vessel density was supported at the gene expression level with RNA-Seq analysis and with comparison of vessel densities in soleus muscle. Following stimulation, capillary sprouting and vessel density were impaired in aged networks at 3 and 10 days, respectively. Our results suggest that aging associated with impaired angiogenesis mechanisms might not influence normal microvascular function, since unstimulated aged microvascular networks can display a "normal adult-like" vessel density and architecture. NEW & NOTEWORTHY Using a multidimensional approach, we present evidence supporting that aged microvascular networks display vessel density and patterning similar to adult networks despite also being characterized by a decreased capacity to undergo angiogenesis. Thus, vessel loss is not necessarily a characteristic of aging.
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Affiliation(s)
- Richard S Sweat
- Department of Biomedical Engineering, Tulane University, New Orleans, Louisiana
| | - David C Sloas
- Department of Biomedical Engineering, Tulane University, New Orleans, Louisiana
| | - Scott A Stewart
- Department of Biomedical Engineering, Tulane University, New Orleans, Louisiana
| | | | - Melody Baddoo
- Tulane Cancer Center, Tulane University School of Medicine, New Orleans, Louisiana.,Department of Pathology and Laboratory Medicine, Tulane University School of Medicine, New Orleans, Louisiana; and
| | - James R Eastwood
- Tulane Center for Aging, Tulane University School of Medicine, New Orleans, Louisiana
| | | | - Mohammad S Azimi
- Department of Biomedical Engineering, Tulane University, New Orleans, Louisiana
| | - Hope E Burks
- Department of Biomedical Engineering, Tulane University, New Orleans, Louisiana
| | - Lee O Chedister
- Department of Biomedical Engineering, Tulane University, New Orleans, Louisiana
| | - Leann Myers
- Department of Biostatistics and Bioinformatics, Tulane University School of Public Health and Tropical Medicine, New Orleans, Louisiana
| | - Walter L Murfee
- Department of Biomedical Engineering, Tulane University, New Orleans, Louisiana;
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158
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He L, Kernogitski Y, Kulminskaya I, Loika Y, Arbeev KG, Loiko E, Bagley O, Duan M, Yashkin A, Ukraintseva SV, Kovtun M, Yashin AI, Kulminski AM. Pleiotropic Meta-Analyses of Longitudinal Studies Discover Novel Genetic Variants Associated with Age-Related Diseases. Front Genet 2016; 7:179. [PMID: 27790247 PMCID: PMC5061751 DOI: 10.3389/fgene.2016.00179] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Accepted: 09/21/2016] [Indexed: 01/31/2023] Open
Abstract
Age-related diseases may result from shared biological mechanisms in intrinsic processes of aging. Genetic effects on age-related diseases are often modulated by environmental factors due to their little contribution to fitness or are mediated through certain endophenotypes. Identification of genetic variants with pleiotropic effects on both common complex diseases and endophenotypes may reveal potential conflicting evolutionary pressures and deliver new insights into shared genetic contribution to healthspan and lifespan. Here, we performed pleiotropic meta-analyses of genetic variants using five NIH-funded datasets by integrating univariate summary statistics for age-related diseases and endophenotypes. We investigated three groups of traits: (1) endophenotypes such as blood glucose, blood pressure, lipids, hematocrit, and body mass index, (2) time-to-event outcomes such as the age-at-onset of diabetes mellitus (DM), cancer, cardiovascular diseases (CVDs) and neurodegenerative diseases (NDs), and (3) both combined. In addition to replicating previous findings, we identify seven novel genome-wide significant loci (< 5e-08), out of which five are low-frequency variants. Specifically, from Group 2, we find rs7632505 on 3q21.1 in SEMA5B, rs460976 on 21q22.3 (1 kb from TMPRSS2) and rs12420422 on 11q24.1 predominantly associated with a variety of CVDs, rs4905014 in ITPK1 associated with stroke and heart failure, rs7081476 on 10p12.1 in ANKRD26 associated with multiple diseases including DM, CVDs, and NDs. From Group 3, we find rs8082812 on 18p11.22 and rs1869717 on 4q31.3 associated with both endophenotypes and CVDs. Our follow-up analyses show that rs7632505, rs4905014, and rs8082812 have age-dependent effects on coronary heart disease or stroke. Functional annotation suggests that most of these SNPs are within regulatory regions or DNase clusters and in linkage disequilibrium with expression quantitative trait loci, implying their potential regulatory influence on the expression of nearby genes. Our mediation analyses suggest that the effects of some SNPs are mediated by specific endophenotypes. In conclusion, these findings indicate that loci with pleiotropic effects on age-related disorders tend to be enriched in genes involved in underlying mechanisms potentially related to nervous, cardiovascular and immune system functions, stress resistance, inflammation, ion channels and hematopoiesis, supporting the hypothesis of shared pathological role of infection, and inflammation in chronic age-related diseases.
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Affiliation(s)
- Liang He
- Biodemography of Aging Research Unit, Social Science Research Institute, Duke UniversityDurham, NC, USA
| | | | | | | | | | | | | | | | | | | | | | | | - Alexander M. Kulminski
- Biodemography of Aging Research Unit, Social Science Research Institute, Duke UniversityDurham, NC, USA
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159
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Tromp J, Meyer S, Mentz RJ, O'Connor CM, Metra M, Dittrich HC, Ponikowski P, Teerlink JR, Cotter G, Davison B, Cleland JG, Givertz MM, Bloomfield DM, van Veldhuisen DJ, Hillege HL, Voors AA, van der Meer P. Acute heart failure in the young: Clinical characteristics and biomarker profiles. Int J Cardiol 2016; 221:1067-72. [DOI: 10.1016/j.ijcard.2016.06.339] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Revised: 05/24/2016] [Accepted: 06/21/2016] [Indexed: 12/13/2022]
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160
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Sapmaz E, Uysal M, Tumer MK, Sapmaz HI, Somuk BT, Arici A, Tas U. Investigation of age-related changes in the expression of aquaporin-1 and aquaporin-5 in the salivary glands of mice. Acta Otolaryngol 2016; 136:937-43. [PMID: 27067150 DOI: 10.3109/00016489.2016.1165353] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
CONCLUSION The increased AQP5 expression associated with ageing in glands, which mainly secreted a serous solution, suggests a compensation for the decreased amount of saliva secretion associated with age progression. OBJECTIVE To investigate the change in aquaporin-1 (AQP1) and aquaporin-5 (AQP5) expression in the salivary glands in young and elder mice. MATERIALS AND METHOD Twelve female mice from the Balb/C genus (30-50 g) were used. The mice were separated into two groups: Group I had 2-month-old mice and Group II had 18-month-old mice. Salivary glands (glandula parotidea, glandula sublungualis, glandula submaxillaris) were excised and examined immunohistochemically and histopathologically. AQP1 and AQP5 expression of young and elder mice was evaluated using the H-score. A p-value less than 0.05 was considered statistically significant. RESULTS Upon histopathological examination, the acini of glands were found to be atrophic in elder mice. The number and diameter of intercalated ducts were increased. Indeed, the amount of adipose tissue in the gland was increased. Upon immunohistochemical examination, both AQP1 and AQP5 levels in sublingual glands of elder mice were increased (p < 0.01 and p < 0.001, respectively). However, only AQP5 levels were increased in the parotid gland of elder mice (p < 0.01).
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Affiliation(s)
- Emrah Sapmaz
- a Department of Otorhinolaryngology, Faculty of Medicine , Gaziosmanpaşa University , Tokat , Turkey
| | - Murat Uysal
- b Department of Anatomy, Faculty of Medicine , Gaziosmanpaşa University , Tokat , Turkey
| | - Mehmet Kemal Tumer
- c Department of Oral and Maxillofacial Surgery, Faculty of Dentistry , Gaziosmanpaşa University , Tokat , Turkey
| | - Hilal Irmak Sapmaz
- b Department of Anatomy, Faculty of Medicine , Gaziosmanpaşa University , Tokat , Turkey
| | - Battal Tahsin Somuk
- a Department of Otorhinolaryngology, Faculty of Medicine , Gaziosmanpaşa University , Tokat , Turkey
| | - Akgul Arici
- d Department of Pathology, Faculty of Medicine , Gaziosmanpaşa University , Tokat , Turkey
| | - Ufuk Tas
- b Department of Anatomy, Faculty of Medicine , Gaziosmanpaşa University , Tokat , Turkey
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161
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Banga A, Mohanka M, Mullins J, Bollineni S, Kaza V, Ring S, Bajona P, Peltz M, Wait M, Torres F. Hospital length of stay after lung transplantation: Independent predictors and association with early and late survival. J Heart Lung Transplant 2016; 36:289-296. [PMID: 27642060 DOI: 10.1016/j.healun.2016.07.020] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Revised: 07/26/2016] [Accepted: 07/31/2016] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND Duration of index hospitalization after lung transplantation (LTx) is an important variable that has not received much attention. We sought to determine independent predictors of prolonged hospital length of stay (LOS) and its association with early and late outcomes. METHODS The United Network of Organ Sharing database was queried for adult patients undergoing LTx between 2006 and 2014 (N = 14,320). Patients with dual organ or previous transplantation and patients who died during the first 25 days after LTx were excluded (n = 12,647, mean age 55.2 years ± 13.1). Primary outcome was prolonged LOS (>25 days) (3,251/12,647; 25.7%). Donor, recipient, and procedure-related variables were analyzed as potential predictors of prolonged LOS. Association of prolonged LOS with 1-year and 5-year survival was evaluated using Cox proportional hazards analysis. RESULTS Independent predictors of prolonged LOS included serum albumin, lung allocation score, functional status, and need of extracorporeal membrane oxygenation or ventilator support at the time of transplant; donor age >40 years; gender mismatch (female donor to male recipient); donor body mass index; African American ethnicity; ischemic time >6 hours; and double LTx. Prolonged LOS was independently associated with increased mortality at 1 year (hazard ratio, 3.96; 95% confidence interval, 3.48-4.50; p < 0.001) and 5 years (hazard ratio, 2.00; 95% confidence interval, 1.79-2.25; p < 0.001). CONCLUSIONS A significant proportion of patients have a prolonged LOS after LTx, and several recipient, donor, and procedure-related variables are independent predictors of this outcome. Patients with prolonged LOS after LTx have significantly increased risk of death at 1 year and 5 years.
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Affiliation(s)
- Amit Banga
- Division of Pulmonary and Critical Care Medicine.
| | | | | | | | - Vaidehi Kaza
- Division of Pulmonary and Critical Care Medicine
| | - Steve Ring
- Department of Cardiovascular and Thoracic Surgery, University of Texas Southwestern Medical Center, Dallas, Texas
| | - Pietro Bajona
- Department of Cardiovascular and Thoracic Surgery, University of Texas Southwestern Medical Center, Dallas, Texas
| | - Matthias Peltz
- Department of Cardiovascular and Thoracic Surgery, University of Texas Southwestern Medical Center, Dallas, Texas
| | - Michael Wait
- Department of Cardiovascular and Thoracic Surgery, University of Texas Southwestern Medical Center, Dallas, Texas
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Jiang Y, Li L, Ma J, Zhang L, Niu F, Feng T, Li C. Auricular vagus nerve stimulation promotes functional recovery and enhances the post-ischemic angiogenic response in an ischemia/reperfusion rat model. Neurochem Int 2016; 97:73-82. [DOI: 10.1016/j.neuint.2016.02.009] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2015] [Revised: 02/12/2016] [Accepted: 02/17/2016] [Indexed: 12/22/2022]
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163
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Investigation of the effects of aging on the expression of aquaporin 1 and aquaporin 4 protein in heart tissue. Anatol J Cardiol 2016; 17:18-23. [PMID: 27443479 PMCID: PMC5324856 DOI: 10.14744/anatoljcardiol.2016.7033] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Objective: Aquaporin (AQP) 1 and AQP 4 are expressed in human heart and several studies have been focused on these two aquaporins. For this purpose, the present study is aimed to research the effects of aging on AQP 1 and AQP 4 in heart tissue. Methods: In this study, 14 Balb/C type white mice were used. Animals were divided into two equal groups. Group I consisted of 2-month-old young animals (n=7), and group II consisted of 18-month-old animals (n=7). To determine the AQP1 and AQP4 expression in the myocardium, the heart tissue was removed to perform western blotting and immunohistochemical and histopathological evaluations. Results: Muscle fibers of the heart in aged animals were more irregular and loosely organized in hematoxylin–eosin (H&E) stained sections. H-score analysis revealed that AQP1 and AQP4 immunoreactivity significantly increased in heart tissues of old mice compared with those of young mice (p<0.001). In addition, AQP1 and AQP4 protein expressions in the tissues of old animals were increased significantly according to western blot analysis (p=0.018 and p<0.001 for AQP1 and AQP4, respectively). Conclusion: Increased AQP1 and AQP4 levels in the heart tissue may be correlated with the maintenance of water and electrolytes balance, which decreases with aging. In this context, it might be the result of a compensatory response to decreased AQP4 functions. In addition, this increase with aging as demonstrated in our study might be one of the factors that increases the tendency of ischemia in elder people.
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164
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Fletcher MA, Low KA, Boyd R, Zimmerman B, Gordon BA, Tan CH, Schneider-Garces N, Sutton BP, Gratton G, Fabiani M. Comparing Aging and Fitness Effects on Brain Anatomy. Front Hum Neurosci 2016; 10:286. [PMID: 27445740 PMCID: PMC4923123 DOI: 10.3389/fnhum.2016.00286] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Accepted: 05/27/2016] [Indexed: 11/16/2022] Open
Abstract
Recent studies suggest that cardiorespiratory fitness (CRF) mitigates the brain’s atrophy typically associated with aging, via a variety of beneficial mechanisms. One could argue that if CRF is generally counteracting the negative effects of aging, the same regions that display the greatest age-related volumetric loss should also show the largest beneficial effects of fitness. To test this hypothesis we examined structural MRI data from 54 healthy older adults (ages 55–87), to determine the overlap, across brain regions, of the profiles of age and fitness effects. Results showed that lower fitness and older age are associated with atrophy in several brain regions, replicating past studies. However, when the profiles of age and fitness effects were compared using a number of statistical approaches, the effects were not entirely overlapping. Interestingly, some of the regions that were most influenced by age were among those not influenced by fitness. Presumably, the age-related atrophy occurring in these regions is due to factors that are more impervious to the beneficial effects of fitness. Possible mechanisms supporting regional heterogeneity may include differential involvement in motor function, the presence of adult neurogenesis, and differential sensitivity to cerebrovascular, neurotrophic and metabolic factors.
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Affiliation(s)
- Mark A Fletcher
- Beckman Institute, University of Illinois, UrbanaIL, USA; Neuroscience Program, University of Illinois, UrbanaIllinois, USA
| | - Kathy A Low
- Beckman Institute, University of Illinois, Urbana IL, USA
| | - Rachel Boyd
- Beckman Institute, University of Illinois, UrbanaIL, USA; Department of Psychology, University of Illinois, UrbanaIL, USA
| | - Benjamin Zimmerman
- Beckman Institute, University of Illinois, UrbanaIL, USA; Neuroscience Program, University of Illinois, UrbanaIllinois, USA
| | - Brian A Gordon
- Department of Radiology, Washington University in St. Louis, Saint Louis MO, USA
| | - Chin H Tan
- Beckman Institute, University of Illinois, UrbanaIL, USA; Department of Psychology, University of Illinois, UrbanaIL, USA
| | - Nils Schneider-Garces
- Beckman Institute, University of Illinois, UrbanaIL, USA; Department of Psychology, University of Illinois, UrbanaIL, USA
| | - Bradley P Sutton
- Beckman Institute, University of Illinois, UrbanaIL, USA; Neuroscience Program, University of Illinois, UrbanaIllinois, USA; Department of Bioengineering, University of Illinois at Urbana-Champaign, UrbanaIL, USA
| | - Gabriele Gratton
- Beckman Institute, University of Illinois, UrbanaIL, USA; Neuroscience Program, University of Illinois, UrbanaIllinois, USA; Department of Psychology, University of Illinois, UrbanaIL, USA; Department of Bioengineering, University of Illinois at Urbana-Champaign, UrbanaIL, USA
| | - Monica Fabiani
- Beckman Institute, University of Illinois, UrbanaIL, USA; Neuroscience Program, University of Illinois, UrbanaIllinois, USA; Department of Psychology, University of Illinois, UrbanaIL, USA; Department of Bioengineering, University of Illinois at Urbana-Champaign, UrbanaIL, USA
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Ben-Shoshan J, Steinvil A, Arbel Y, Topilsky Y, Barak L, Entin-Meer M, Levy R, Schwartz AL, Keren G, Finkelstein A, Banai S. Sustained Elevation of Vascular Endothelial Growth Factor and Angiopoietin-2 Levels After Transcatheter Aortic Valve Replacement. Can J Cardiol 2016; 32:1454-1461. [PMID: 27720271 DOI: 10.1016/j.cjca.2016.05.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2015] [Revised: 05/27/2016] [Accepted: 05/27/2016] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND Transcatheter aortic valve replacement (TAVR) exposes the systemic vasculature to increased mechanical forces. Endothelial adaptation to mechanical stimuli is associated with angiogenic activation through various growth factors. We studied the potential angiogenic shift evoked by TAVR. METHODS From a cohort of 69 consecutive patients undergoing TAVR, we excluded patients with conditions known to affect angiogenic factors, and serum vascular endothelial growth factor (VEGF) and angiopoietin (Ang)-1 and Ang-2 were assessed by ELISA. We assessed in vitro the properties of endothelial cells after exposure to serum collected from patients undergoing TAVR using adhesion, migration, and Matrigel angiogenesis assays. The correlation between changes in angiogenic factors and cardiac functions was evaluated on 30- day echocardiograms. RESULTS The study population consisted of 46 patients (82 ± 5 years). Two days after TAVR the post/pre TAVR ratio of VEGF, Ang-1, and Ang-2 was 5.38 ± 4 (P < 0.001), 1.05 ± 0.49 (P = 0.27), and 4.65 ± 2.01 (P < 0.001), respectively. The increase in VEGF and Ang-2 showed a significant correlation (r = 0.609; P < 0.001), but no correlation was found with hemolysis or tissue injury markers. Patients with relatively low levels of VEGF or an Ang-2 rise had more severe aortic stenosis and coronary disease at baseline. Exposure of endothelial cells to post-TAVR serum induced adhesion, migration, and tube formation compared with pre-TAVR serum. An increase in VEGF levels correlated with improvement in pulmonary systolic pressure and a right ventricular fractional area change at 30 days, (r = 0.54 and r = 0.48, respectively; P < 0.01). CONCLUSIONS Sustained elevation of VEGF and Ang-2 levels occur after TAVR, reflecting a systemic angiogenic shift. A rise in VEGF levels is associated with a decrease in pulmonary blood pressure in patients undergoing TAVR.
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Affiliation(s)
- Jeremy Ben-Shoshan
- Department of Cardiology, Tel Aviv Medical Center, Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel.
| | - Arie Steinvil
- Department of Cardiology, Tel Aviv Medical Center, Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Yaron Arbel
- Department of Cardiology, Tel Aviv Medical Center, Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Yan Topilsky
- Department of Cardiology, Tel Aviv Medical Center, Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Leehee Barak
- Department of Cardiology, Tel Aviv Medical Center, Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Michal Entin-Meer
- Department of Cardiology, Tel Aviv Medical Center, Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Ran Levy
- Department of Cardiology, Tel Aviv Medical Center, Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Arie Lorin Schwartz
- Department of Cardiology, Tel Aviv Medical Center, Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Gad Keren
- Department of Cardiology, Tel Aviv Medical Center, Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Ariel Finkelstein
- Department of Cardiology, Tel Aviv Medical Center, Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Shmuel Banai
- Department of Cardiology, Tel Aviv Medical Center, Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
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Changes in Angiotensin Receptor Distribution and in Aortic Morphology Are Associated with Blood Pressure Control in Aged Metabolic Syndrome Rats. Int J Hypertens 2016; 2016:5830192. [PMID: 27293881 PMCID: PMC4886055 DOI: 10.1155/2016/5830192] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2016] [Revised: 04/22/2016] [Accepted: 04/27/2016] [Indexed: 11/18/2022] Open
Abstract
The role of the renin-angiotensin system (RAS) in blood pressure regulation in MS during aging is unknown. It participates in metabolic syndrome (MS) and aging regulating vascular tone and remodeling. RAS might participate in a compensatory mechanism decreasing blood pressure and allowing MS rats to reach 18 months of age and it might form part of therapeutical procedures to ameliorate MS. We studied histological changes and distribution of RAS receptors in aortas of MS aged rats. Electron microscopy images showed premature aging in MS since the increased fibrosis, enlarged endothelium, and invasion of this layer by muscle cells that was present in control 18-month-old aortas were also found in 6-month-old aortas from MS rats. AT1, AT2, and Mas receptors mediate the effects of Ang II and Ang 1-7, respectively. Fluorescence from AT2 decreased with age in control and MS aortas, while fluorescence of AT1 increased in aortas from MS rats at 6 months and diminished during aging. Mas expression increased in MS rats and remained unchanged in control rats. In conclusion, there is premature aging in the aortas from MS rats and the elevated expression of Mas receptor might contribute to decrease blood pressure during aging in MS.
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167
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Yepuri G, Sukhovershin R, Nazari-Shafti TZ, Petrascheck M, Ghebre YT, Cooke JP. Proton Pump Inhibitors Accelerate Endothelial Senescence. Circ Res 2016; 118:e36-42. [PMID: 27166251 DOI: 10.1161/circresaha.116.308807] [Citation(s) in RCA: 102] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2016] [Accepted: 04/19/2016] [Indexed: 12/19/2022]
Abstract
RATIONALE Proton pump inhibitors (PPIs) are popular drugs for gastroesophageal reflux, which are now available for long-term use without medical supervision. Recent reports suggest that PPI use is associated with cardiovascular, renal, and neurological morbidity. OBJECTIVE To study the long-term effect of PPIs on endothelial dysfunction and senescence and investigate the mechanism involved in PPI-induced vascular dysfunction. METHODS AND RESULTS Chronic exposure to PPIs impaired endothelial function and accelerated human endothelial senescence by reducing telomere length. CONCLUSIONS Our data may provide a unifying mechanism for the association of PPI use with increased risk of cardiovascular, renal, and neurological morbidity and mortality.
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Affiliation(s)
- Gautham Yepuri
- From the Department of Cardiovascular Sciences, Center for Cardiovascular Regeneration, Houston Methodist Research Institute, TX (G.Y., R.S., T.Z.N-.S., J.P.C.); Department of Chemical Physiology, Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, CA (M.P.); and Department of Radiation Oncology, Baylor College of Medicine, One Baylor Plaza, Houston, TX (Y.T.G.)
| | - Roman Sukhovershin
- From the Department of Cardiovascular Sciences, Center for Cardiovascular Regeneration, Houston Methodist Research Institute, TX (G.Y., R.S., T.Z.N-.S., J.P.C.); Department of Chemical Physiology, Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, CA (M.P.); and Department of Radiation Oncology, Baylor College of Medicine, One Baylor Plaza, Houston, TX (Y.T.G.)
| | - Timo Z Nazari-Shafti
- From the Department of Cardiovascular Sciences, Center for Cardiovascular Regeneration, Houston Methodist Research Institute, TX (G.Y., R.S., T.Z.N-.S., J.P.C.); Department of Chemical Physiology, Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, CA (M.P.); and Department of Radiation Oncology, Baylor College of Medicine, One Baylor Plaza, Houston, TX (Y.T.G.)
| | - Michael Petrascheck
- From the Department of Cardiovascular Sciences, Center for Cardiovascular Regeneration, Houston Methodist Research Institute, TX (G.Y., R.S., T.Z.N-.S., J.P.C.); Department of Chemical Physiology, Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, CA (M.P.); and Department of Radiation Oncology, Baylor College of Medicine, One Baylor Plaza, Houston, TX (Y.T.G.)
| | - Yohannes T Ghebre
- From the Department of Cardiovascular Sciences, Center for Cardiovascular Regeneration, Houston Methodist Research Institute, TX (G.Y., R.S., T.Z.N-.S., J.P.C.); Department of Chemical Physiology, Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, CA (M.P.); and Department of Radiation Oncology, Baylor College of Medicine, One Baylor Plaza, Houston, TX (Y.T.G.)
| | - John P Cooke
- From the Department of Cardiovascular Sciences, Center for Cardiovascular Regeneration, Houston Methodist Research Institute, TX (G.Y., R.S., T.Z.N-.S., J.P.C.); Department of Chemical Physiology, Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, CA (M.P.); and Department of Radiation Oncology, Baylor College of Medicine, One Baylor Plaza, Houston, TX (Y.T.G.).
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Paneni F, Costantino S, Kränkel N, Cosentino F, Lüscher TF. Reprogramming ageing and longevity genes restores paracrine angiogenic properties of early outgrowth cells. Eur Heart J 2016; 37:1733-7. [DOI: 10.1093/eurheartj/ehw073] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Accepted: 02/01/2016] [Indexed: 01/20/2023] Open
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Czepluch FS, Vogler M, Kuschicke H, Meier J, Gogiraju R, Katschinski DM, Riggert J, Hasenfuss G, Schäfer K. Circulating Endothelial Cells Expressing the Angiogenic Transcription Factor Krüppel-Like Factor 4 are Decreased in Patients with Coronary Artery Disease. Microcirculation 2015. [DOI: 10.1111/micc.12226] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Frauke S. Czepluch
- Department of Cardiology and Pulmonary Medicine; University Medical Center Göttingen; Göttingen Germany
| | - Melanie Vogler
- Department of Cardiology and Pulmonary Medicine; University Medical Center Göttingen; Göttingen Germany
- Institute of Cardiovascular Physiology; University Medical Center Göttingen; Göttingen Germany
| | - Hendrik Kuschicke
- Department of Cardiology and Pulmonary Medicine; University Medical Center Göttingen; Göttingen Germany
| | - Julia Meier
- Department of Cardiology and Pulmonary Medicine; University Medical Center Göttingen; Göttingen Germany
| | - Rajinikanth Gogiraju
- Department of Cardiology and Pulmonary Medicine; University Medical Center Göttingen; Göttingen Germany
| | - Dörthe M. Katschinski
- Institute of Cardiovascular Physiology; University Medical Center Göttingen; Göttingen Germany
| | - Joachim Riggert
- Department of Transfusion Medicine; University Medical Center Göttingen; Göttingen Germany
| | - Gerd Hasenfuss
- Department of Cardiology and Pulmonary Medicine; University Medical Center Göttingen; Göttingen Germany
| | - Katrin Schäfer
- Department of Cardiology and Pulmonary Medicine; University Medical Center Göttingen; Göttingen Germany
- Medical Clinic 2; Department of Cardiology; University Medical Center Mainz; Mainz Germany
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Mohamed Omer S, Krishna SM, Li J, Moxon JV, Nsengiyumva V, Golledge J. The efficacy of extraembryonic stem cells in improving blood flow within animal models of lower limb ischaemia. Heart 2015; 102:69-74. [PMID: 26573094 DOI: 10.1136/heartjnl-2015-308322] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Accepted: 10/17/2015] [Indexed: 11/04/2022] Open
Abstract
BACKGROUND Stem cell (SC) administration is a potential therapeutic strategy to improve blood supply in patients with peripheral artery disease (PAD). The aim of this systematic review and meta-analysis was to investigate the efficacy of extraembryonic tissue-derived SC (ETSC) in improving blood flow within animal models of hindlimb ischaemia (HLI). METHODS PubMed, ScienceDirect and Web of Science were searched to identify studies which investigated ETSCs within animal HLI models. A meta-analysis was performed focusing on the effect of ETSCs on limb blood flow assessed by laser Doppler imaging using a random effects model. Methodological quality was assessed using a newly devised quality assessment tool. RESULTS Five studies investigating umbilical cord-derived SCs (three studies), placental SCs (one study), amnion and chorionic SCs (one study) were included. A meta-analysis suggested that administration of ETSCs improved the restoration of blood flow within the HLI models used. The methodological quality of the included studies was assessed as poor. Problems identified included lack of randomised design and blinding of outcome assessors; that the animal models did not incorporate recognised risk factors for human PAD or atherosclerosis; the models used did not have established chronic ischaemia as is the cases in most patients presenting with PAD; and the studies lacked a clear rationale for the dosage and frequency of SCs administered. CONCLUSIONS The identified studies suggest that ETSCs improve recovery of limb blood supply within current animal HLI models. Improved study quality is, however, needed to provide support for the likelihood of translating these findings to patients with PAD.
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Affiliation(s)
- Safraz Mohamed Omer
- Queensland Research Centre for Peripheral Vascular Diseases, College of Medicine and Dentistry, James Cook University, Townsville, Queensland, Australia
| | - Smriti Murali Krishna
- Queensland Research Centre for Peripheral Vascular Diseases, College of Medicine and Dentistry, James Cook University, Townsville, Queensland, Australia
| | - Jiaze Li
- Queensland Research Centre for Peripheral Vascular Diseases, College of Medicine and Dentistry, James Cook University, Townsville, Queensland, Australia
| | - Joseph Vaughan Moxon
- Queensland Research Centre for Peripheral Vascular Diseases, College of Medicine and Dentistry, James Cook University, Townsville, Queensland, Australia
| | - Vianne Nsengiyumva
- Queensland Research Centre for Peripheral Vascular Diseases, College of Medicine and Dentistry, James Cook University, Townsville, Queensland, Australia
| | - Jonathan Golledge
- Queensland Research Centre for Peripheral Vascular Diseases, College of Medicine and Dentistry, James Cook University, Townsville, Queensland, Australia Department of Vascular and Endovascular Surgery, The Townsville Hospital, Townsville, Queensland, Australia
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171
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Ambrose C. Muscle weakness during aging: a deficiency state involving declining angiogenesis. Ageing Res Rev 2015; 23:139-53. [PMID: 26093038 DOI: 10.1016/j.arr.2015.03.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Revised: 03/19/2015] [Accepted: 03/30/2015] [Indexed: 12/12/2022]
Abstract
This essay begins by proposing that muscle weakness of old age from sarcopenia is due in large part to reduced capillary density in the muscles, as documented in 9 reports of aged persons and animals. Capillary density (CD) is determined by local levels of various angiogenic factors, which also decline in muscles with aging, as reported in 7 studies of old persons and animals. There are also numerous reports of reduced CD in the aged brain and other studies showing reduced CD in the kidney and heart of aged animals. Thus a waning angiogenesis throughout the body may be a natural occurrence in later years and may account significantly for the lesser ailments (physical and cognitive) of elderly people. Old age is regarded here as a deficiency state which may be corrected by therapeutic angiogenesis, much as a hormonal deficiency can be relieved by the appropriate hormone therapy. Such therapy could employ recombinant angiogenic factors which are now commercially available.
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Elkhattouti A, Hassan M, Gomez CR. Stromal Fibroblast in Age-Related Cancer: Role in Tumorigenesis and Potential as Novel Therapeutic Target. Front Oncol 2015; 5:158. [PMID: 26284191 PMCID: PMC4515566 DOI: 10.3389/fonc.2015.00158] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Accepted: 07/02/2015] [Indexed: 12/28/2022] Open
Abstract
Incidence of most common cancers increases with age due to accumulation of damage to cells and tissues. Stroma, the structure close to the basement membrane, is gaining increased attention from clinicians and researchers due to its increasingly, yet incompletely understood role in the development of age-related cancer. With advanced age, stroma generates a pro-tumorigenic microenvironment, exemplified by the senescence-associated secretory phenotype (SASP). Components of the SASP, such as cytokines, chemokines, and high energy metabolites are main drivers of age-related cancer initiation and sustain its progression. Our purpose is to provide insight into the mechanistic role of the stroma, with particular emphasis on stromal fibroblasts, on the development of age-related tumors. We also present evidence of the potential of the stroma as target for tumor therapy. Likewise, a rationale for age-related antitumor therapy targeting the stroma is presented. We expect to foster debate on the underlining basis of age-related cancer pathobiology. We also would like to promote discussion on novel stroma-based anticancer therapeutic strategies tailored to treat the elderly.
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Affiliation(s)
| | - Mohamed Hassan
- Cancer Institute, University of Mississippi Medical Center , Jackson, MS , USA
| | - Christian R Gomez
- Cancer Institute, University of Mississippi Medical Center , Jackson, MS , USA ; Department of Pathology, University of Mississippi Medical Center , Jackson, MS , USA ; Department of Radiation Oncology, University of Mississippi Medical Center , Jackson, MS , USA
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173
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Valli A, Harris AL, Kessler BM. Hypoxia metabolism in ageing. Aging (Albany NY) 2015; 7:465-6. [PMID: 26187134 PMCID: PMC4543034 DOI: 10.18632/aging.100782] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Accepted: 07/15/2015] [Indexed: 11/25/2022]
Affiliation(s)
- Alessandro Valli
- Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
- Target Discovery Institute, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | - Adrian L Harris
- Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Benedikt M Kessler
- Target Discovery Institute, Nuffield Department of Medicine, University of Oxford, Oxford, UK
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Stefanska A, Eng D, Kaverina N, Duffield JS, Pippin JW, Rabinovitch P, Shankland SJ. Interstitial pericytes decrease in aged mouse kidneys. Aging (Albany NY) 2015; 7:370-82. [PMID: 26081073 PMCID: PMC4505164 DOI: 10.18632/aging.100756] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/15/2023]
Abstract
With increasing age, the kidney undergoes characteristic changes in the glomerular and tubulo-interstitial compartments, which are ultimately accompanied by reduced kidney function. Studies have shown age-related loss of peritubular vessels. Normal peritubular vessel tone, function and survival depend on neighboring pericytes. Pericyte detachment leads to vascular damage, which can be accompanied by their differentiation to fibroblasts and myofibroblasts, a state that favors matrix production. To better understand the fate of pericytes in the aged kidney, 27 month-old mice were studied. Compared to 3 month-old young adult mice, aged kidneys showed a substantial decrease in capillaries, identified by CD31 staining, in both cortex and medulla. This was accompanied by a marked decrease in surrounding NG2+ / PDGFRβ+ pericytes. This decrease was more pronounced in the medulla. Capillaries devoid of pericytes were typically dilated in aged mice. Aged kidneys were also characterized by interstitial fibrosis due to increased collagen-I and -III staining. This was accompanied by an increase in the number of pericytes that acquired a pro-fibrotic phenotype, identified by increased PDGFRβ+ / αSMA+ staining. These findings are consistent with the decline in kidney interstitial pericytes as a critical step in the development of changes to the peritubular vasculature with aging, and accompanying fibrosis.
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Affiliation(s)
- Ania Stefanska
- Division of Nephrology, Department of Medicine, University of Washington, Seattle, WA 98104, USA
| | - Diana Eng
- Division of Nephrology, Department of Medicine, University of Washington, Seattle, WA 98104, USA
| | - Natalya Kaverina
- Division of Nephrology, Department of Medicine, University of Washington, Seattle, WA 98104, USA
| | - Jeremy S. Duffield
- Division of Nephrology, Department of Medicine, University of Washington, Seattle, WA 98104, USA
- Biogen Idec, Cambridge, MA 02142, USA
| | - Jeffrey W. Pippin
- Division of Nephrology, Department of Medicine, University of Washington, Seattle, WA 98104, USA
| | - Peter Rabinovitch
- Department of Pathology, University of Washington, Seattle, WA 98195, USA
| | - Stuart J. Shankland
- Division of Nephrology, Department of Medicine, University of Washington, Seattle, WA 98104, USA
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Duscher D, Barrera J, Wong VW, Maan ZN, Whittam AJ, Januszyk M, Gurtner GC. Stem Cells in Wound Healing: The Future of Regenerative Medicine? A Mini-Review. Gerontology 2015; 62:216-25. [PMID: 26045256 DOI: 10.1159/000381877] [Citation(s) in RCA: 144] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Accepted: 03/25/2015] [Indexed: 01/13/2023] Open
Abstract
The increased risk of disease and decreased capacity to respond to tissue insult in the setting of aging results from complex changes in homeostatic mechanisms, including the regulation of oxidative stress and cellular heterogeneity. In aged skin, the healing capacity is markedly diminished resulting in a high risk for chronic wounds. Stem cell-based therapies have the potential to enhance cutaneous regeneration, largely through trophic and paracrine activity. Candidate cell populations for therapeutic application include adult mesenchymal stem cells, embryonic stem cells and induced pluripotent stem cells. Autologous cell-based approaches are ideal to minimize immune rejection but may be limited by the declining cellular function associated with aging. One strategy to overcome age-related impairments in various stem cell populations is to identify and enrich with functionally superior stem cell subsets via single cell transcriptomics. Another approach is to optimize cell delivery to the harsh environment of aged wounds via scaffold-based cell applications to enhance engraftment and paracrine activity of therapeutic stem cells. In this review, we shed light on challenges and recent advances surrounding stem cell therapies for wound healing and discuss limitations for their clinical adoption.
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Affiliation(s)
- Dominik Duscher
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford University School of Medicine, Stanford, Calif., USA
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Farrokh S, Brillen AL, Haendeler J, Altschmied J, Schaal H. Critical regulators of endothelial cell functions: for a change being alternative. Antioxid Redox Signal 2015; 22:1212-29. [PMID: 25203279 DOI: 10.1089/ars.2014.6023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
SIGNIFICANCE The endothelium regulates vessel dilation and constriction, balances hemostasis, and inhibits thrombosis. In addition, pro- and anti-angiogenic molecules orchestrate proliferation, survival, and migration of endothelial cells. Regulation of all these processes requires fine-tuning of signaling pathways, which can easily be tricked into running the opposite direction when exogenous or endogenous signals get out of hand. Surprisingly, some critical regulators of physiological endothelial functions can turn malicious by mere alternative splicing, leading to the expression of protein isoforms with opposite functions. RECENT ADVANCES While reviewing the evidence of alternative splicing on cellular physiology, it became evident that expression of splice factors and their activities are regulated by externally triggered signaling cascades. Furthermore, genome-wide identification of RNA-binding sites of splicing regulatory proteins now offer a glimpse into the splicing code responsible for alternative splicing of molecules regulating endothelial functions. CRITICAL ISSUES Due to the constantly growing number of transcript and protein isoforms, it will become more and more important to identify and characterize all transcripts and proteins regulating endothelial cell functions. One critical issue will be a non-ambiguous nomenclature to keep consistency throughout different laboratories. FUTURE DIRECTIONS RNA-deep sequencing focusing on exon-exon junction needs to more reliably identify alternative splicing events combined with functional analyses that will uncover more splice variants contributing to or inhibiting proper endothelial functions. In addition, understanding the signals mediating alternative splicing and its regulation might allow us to derive new strategies to preserve endothelial function by suppressing or upregulating specific protein isoforms. Antioxid. Redox Signal. 22, 1212-1229.
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Affiliation(s)
- Sabrina Farrokh
- 1 Heisenberg-Group-Environmentally-Induced Cardiovascular Degeneration, IUF-Leibniz Research Institute for Environmental Medicine , Düsseldorf, Germany
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Ledford KJ, Murphy N, Zeigler F, Bartel RL, Tubo R. Therapeutic potential of ixmyelocel-T, an expanded autologous multicellular therapy for treatment of ischemic cardiovascular diseases. Stem Cell Res Ther 2015; 6:25. [PMID: 25889271 PMCID: PMC4413547 DOI: 10.1186/s13287-015-0007-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Revised: 02/09/2015] [Accepted: 02/09/2015] [Indexed: 11/10/2022] Open
Abstract
INTRODUCTION Bone marrow derived cellular therapies are an emerging approach to promoting therapeutic angiogenesis in ischemic cardiovascular disease. However, the percentage of regenerative cells in bone marrow mononuclear cells (BMMNCs) is small, and large amounts of BMMNCs are required. Ixmyelocel-T, an expanded autologous multicellular therapy, is manufactured from a small sample of bone marrow aspirate. Ixmyelocel-T contains expanded populations of mesenchymal stromal cells (MSCs) and M2-like macrophages, as well as many of the CD45+ cells found in the bone marrow. It is hypothesized that this expanded multi-cellular therapy would induce angiogenesis and endothelial repair. METHODS A rat model of hind limb ischemia was used to determine the effects of ixmyelocel-T on blood flow recovery. To further determine the effects on endothelial cells, ixmyelocel-T was co-cultured with human umbilical vein endothelial cells (HUVEC) in non-contacting Transwell® inserts. RESULTS Co-culture of HUVECs with ixmyelocel-T resulted secretion of a variety of pro-angiogenic factors. HUVECs stimulated by ixmyelocel-T exhibited enhanced migration, proliferation, and branch formation. Ixmyelocel-T co-culture also resulted in increased endothelial nitric oxide synthase (eNOS) expression and nitric oxide (NO) production. In tumor necrosis factor alpha (TNFα)-stimulated HUVECs, ixmyelocel-T co-culture decreased apoptosis and reactive oxygen species generation, increased super oxide dismutase activity, and decreased nuclear factor kappa B (NFκB) activation. Treatment with ixmyelocel-T in a rat model of hind limb ischemia resulted in significantly increased blood flow perfusion and capillary density, gene expression and plasma levels of the anti-inflammatory cytokine interleukin (IL)-10, plasma nitrates, plasma platelet-derived growth factor (PDGF)-BB, vascular endothelial growth factor (VEGF) expression, and significantly decreased plasma thiobarbituric acid reactive substances (TBARS). CONCLUSIONS This work demonstrates that ixmyelocel-T interacts with endothelial cells in a paracrine manner, resulting in angiogenesis and endothelial protection. This data suggests that ixmyelocel-T could be useful for promoting of angiogenesis and tissue repair in ischemic cardiovascular diseases. In conclusion, ixmyelocel-T therapy may provide a new aspect of therapeutic angiogenesis in this patient population where expanded populations of regenerative cells might be required.
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Affiliation(s)
- Kelly J Ledford
- Aastrom Biosciences, Domino's Farms, Lobby K 24 Frank Lloyd Wright Drive, Ann Arbor, MI, 48105, USA.
| | - Nikki Murphy
- Aastrom Biosciences, Domino's Farms, Lobby K 24 Frank Lloyd Wright Drive, Ann Arbor, MI, 48105, USA.
| | - Frank Zeigler
- Aastrom Biosciences, Domino's Farms, Lobby K 24 Frank Lloyd Wright Drive, Ann Arbor, MI, 48105, USA.
| | - Ronnda L Bartel
- Aastrom Biosciences, Domino's Farms, Lobby K 24 Frank Lloyd Wright Drive, Ann Arbor, MI, 48105, USA.
| | - Ross Tubo
- Aastrom Biosciences, Domino's Farms, Lobby K 24 Frank Lloyd Wright Drive, Ann Arbor, MI, 48105, USA.
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Song W, Wang X. The role of TGFβ1 and LRG1 in cardiac remodelling and heart failure. Biophys Rev 2015; 7:91-104. [PMID: 28509980 PMCID: PMC4322186 DOI: 10.1007/s12551-014-0158-y] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Accepted: 11/26/2014] [Indexed: 12/12/2022] Open
Abstract
Heart failure is a life-threatening condition that carries a considerable emotional and socio-economic burden. As a result of the global increase in the ageing population, sedentary life-style, increased prevalence of risk factors, and improved survival from cardiovascular events, the incidence of heart failure will continue to rise. Despite the advances in current cardiovascular therapies, many patients are not suitable for or may not benefit from conventional treatments. Thus, more effective therapies are required. Transforming growth factor (TGF) β family of cytokines is involved in heart development and dys-regulated TGFβ signalling is commonly associated with fibrosis, aberrant angiogenesis and accelerated progression into heart failure. Therefore, a potential therapeutic pathway is to modulate TGFβ signalling; however, broad blockage of TGFβ signalling may cause unwanted side effects due to its pivotal role in tissue homeostasis. We found that leucine-rich α-2 glycoprotein 1 (LRG1) promotes blood vessel formation via regulating the context-dependent endothelial TGFβ signalling. This review will focus on the interaction between LRG1 and TGFβ signalling, their involvement in the pathogenesis of heart failure, and the potential for LRG1 to function as a novel therapeutic target.
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Affiliation(s)
- Weihua Song
- Division of Metabolic Medicine, Lee Kong Chian School of Medicine, Nanyang Technological University, Research Techno Plaza, X-Frontiers Block, Level 4, 50 Nan yang Drive, Singapore, 637553, Singapore
| | - Xiaomeng Wang
- Division of Metabolic Medicine, Lee Kong Chian School of Medicine, Nanyang Technological University, Research Techno Plaza, X-Frontiers Block, Level 4, 50 Nan yang Drive, Singapore, 637553, Singapore. .,Division of Cell Biology in Health and Disease, Institute of Molecular and Cell Biology, Singapore Agency for Science, Technology and Research, 61 Biopolis Drive, Proteos, Singapore, 138673, Singapore. .,Department of Cell Biology, Institute of Ophthalmology, University College London, 11-43 Bath Street, London, EC1V 9EL, UK.
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179
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Yang Y, Wu Z, Meininger CJ, Wu G. L-Leucine and NO-mediated cardiovascular function. Amino Acids 2015; 47:435-47. [PMID: 25552397 DOI: 10.1007/s00726-014-1904-y] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Accepted: 12/13/2014] [Indexed: 02/06/2023]
Abstract
Reduced availability of nitric oxide (NO) in the vasculature is a major factor contributing to the impaired action of insulin on blood flow and, therefore, insulin resistance in obese and diabetic subjects. Available evidence shows that vascular insulin resistance plays an important role in the pathogenesis of cardiovascular disease, the leading cause of death in developed nations. Interestingly, increased concentrations of L-leucine in the plasma occur in obese humans and other animals with vascular dysfunction. Among branched-chain amino acids, L-leucine is unique in inhibiting NO synthesis from L-arginine in endothelial cells and may modulate cardiovascular homeostasis in insulin resistance. Results of recent studies indicate that L-leucine is an activator of glutamine:fructose-6-phosphate aminotransferase (GFAT), which is the first and a rate-controlling enzyme in the synthesis of glucosamine (an inhibitor of endothelial NO synthesis). Through stimulating the mammalian target of rapamycin signaling pathway and thus protein synthesis, L-leucine may enhance GFAT protein expression, thereby inhibiting NO synthesis in endothelial cells. We propose that reducing circulating levels of L-leucine or endothelial GFAT activity may provide a potentially novel strategy for preventing and/or treating cardiovascular disease in obese and diabetic subjects. Such means may include dietary supplementation with either α-ketoglutarate to enhance the catabolism of L-leucine in the small intestine and other tissues or with N-ethyl-L-glutamine to inhibit GFAT activity in endothelial cells. Preventing leucine-induced activation of GFAT by nutritional supplements or pharmaceutical drugs may contribute to improved cardiovascular function by enhancing vascular NO synthesis.
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Affiliation(s)
- Ying Yang
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, People's Republic of China,
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180
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Abstract
The incidence of stroke and myocardial infarction increases in aged patients and it is associated with an adverse outcome. Considering the aging population and the increasing incidence of cardiovascular disease, the prediction for population well-being and health economics is daunting. Accordingly, there is an unmet need to focus on fundamental processes underlying vascular aging. A better understanding of the pathways leading to arterial aging may contribute to design mechanism-based therapeutic approaches to prevent or attenuate features of vascular senescence. In the present review, we discuss advances in the pathophysiology of age-related vascular dysfunction including nitric oxide signalling, dysregulation of oxidant/inflammatory genes, epigenetic modifications and mechanisms of vascular calcification as well as insights into vascular repair. Such an overview highlights attractive molecular targets for the prevention of age-driven vascular disease.
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181
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Bitar MS, Al-Mulla F. Upregulation of CREM/ICER suppresses wound endothelial CRE-HIF-1α-VEGF-dependent signaling and impairs angiogenesis in type 2 diabetes. Dis Model Mech 2014; 8:65-80. [PMID: 25381014 PMCID: PMC4283651 DOI: 10.1242/dmm.017145] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Impaired angiogenesis and endothelial dysfunction in type 2 diabetes constitute dominant risk factors for non-healing wounds and most forms of cardiovascular disease. We propose that diabetes shifts the ‘angiogenic balance’ in favor of an excessive anti-angiogenic phenotype. Herein, we report that diabetes impairs in vivo sponge angiogenic capacity by decreasing VEGF expression and fibrovascular invasion, and reciprocally enhances the formation of angiostatic molecules, such as thrombospondins, NFκB and FasL. Defective in vivo angiogenesis prompted cellular studies in cultured endothelial cells derived from subcutaneous sponge implants (SIECs) of control and Goto-Kakizaki rats. Ensuing data from diabetic SIECs demonstrated a marked upregulation in cAMP-PKA-CREB signaling, possibly stemming from increased expression of adenylyl cyclase isoforms 3 and 8, and decreased expression of PDE3. Mechanistically, we found that oxidative stress and PKA activation in diabetes enhanced CREM/ICER expression. This reduces IRS2 cellular content by inhibiting cAMP response element (CRE) transcriptional activity. Consequently, a decrease in the activity of Akt-mTOR ensued with a concomitant reduction in the total and nuclear protein levels of HIF-1α. Limiting HIF-1α availability for the specific hypoxia response elements in diabetic SIECs elicited a marked reduction in VEGF expression, both at the mRNA and protein levels. These molecular abnormalities were illustrated functionally by a defect in various pro-angiogenic properties, including cell proliferation, migration and tube formation. A genetic-based strategy in diabetic SIECs using siRNAs against CREM/ICER significantly augmented the PKA-dependent VEGF expression. To this end, the current data identify the importance of CREM/ICER as a negative regulator of endothelial function and establish a link between CREM/ICER overexpression and impaired angiogenesis during the course of diabetes. Moreover, it could also point to CREM/ICER as a potential therapeutic target in the treatment of pathological angiogenesis.
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Affiliation(s)
- Milad S Bitar
- Department of Pharmacology and Toxicology, Kuwait University, Safat 13110, Kuwait.
| | - Fahd Al-Mulla
- Department of Pathology, Kuwait University, Safat 13110, Kuwait
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182
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Rubio-Ruiz ME, Pérez-Torres I, Soto ME, Pastelín G, Guarner-Lans V. Aging in blood vessels. Medicinal agents FOR systemic arterial hypertension in the elderly. Ageing Res Rev 2014; 18:132-47. [PMID: 25311590 DOI: 10.1016/j.arr.2014.10.001] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2014] [Revised: 10/01/2014] [Accepted: 10/02/2014] [Indexed: 12/12/2022]
Abstract
Aging impairs blood vessel function and leads to cardiovascular disease. The mechanisms underlying the age-related endothelial, smooth muscle and extracellular matrix vascular dysfunction are discussed. Vascular dysfunction is caused by: (1) Oxidative stress enhancement. (2) Reduction of nitric oxide (NO) bioavailability, by diminished NO synthesis and/or augmented NO scavenging. (3) Production of vasoconstrictor/vasodilator factor imbalances. (4) Low-grade pro-inflammatory environment. (5) Impaired angiogenesis. (6) Endothelial cell senescence. The aging process in vascular smooth muscle is characterized by: (1) Altered replicating potential. (2) Change in cellular phenotype. (3) Changes in responsiveness to contracting and relaxing mediators. (4) Changes in intracellular signaling functions. Systemic arterial hypertension is an age-dependent disorder, and almost half of the elderly human population is hypertensive. The influence of hypertension on the aging cardiovascular system has been studied in models of hypertensive rats. Treatment for hypertension is recommended in the elderly. Lifestyle modifications, natural compounds and hormone therapies are useful for initial stages and as supporting treatment with medication but evidence from clinical trials in this population is needed. Since all antihypertensive agents can lower blood pressure in the elderly, therapy should be based on its potential side effects and drug interactions.
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Affiliation(s)
- María Esther Rubio-Ruiz
- Department of Physiology, Instituto Nacional de Cardiología "Ignacio Chávez", México, DF, Mexico
| | - Israel Pérez-Torres
- Department of Pathology, Instituto Nacional de Cardiología "Ignacio Chávez", México, DF, Mexico
| | - María Elena Soto
- Department of Immunology, Instituto Nacional de Cardiología "Ignacio Chávez", México, DF, Mexico
| | - Gustavo Pastelín
- Department of Pharmacology, Instituto Nacional de Cardiología "Ignacio Chávez", México, DF, Mexico
| | - Verónica Guarner-Lans
- Department of Physiology, Instituto Nacional de Cardiología "Ignacio Chávez", México, DF, Mexico.
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183
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Font de Mora J, Díez Juan A. The decay of stem cell nourishment at the niche. Rejuvenation Res 2014; 16:487-94. [PMID: 23937078 DOI: 10.1089/rej.2013.1440] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
One of the main features of human aging is the loss of adult stem cell homeostasis. Organs that are very dependent on adult stem cells show increased susceptibility to aging, particularly organs that present a vascular stem cell niche. Reduced regenerative capacity in tissues correlates with reduced stem cell function, which parallels a loss of microvascular density (rarefraction) and plasticity. Moreover, the age-related loss of microvascular plasticity and rarefaction has significance beyond metabolic support for tissues because stem cell niches are regulated co-ordinately with the vascular cells. In addition, microvascular rarefaction is related to increased inflammatory signals that may negatively regulate the stem cell population. Thus, the processes of microvascular rarefaction, adult stem cell dysfunction, and inflammation underlie the cycle of physiological decline that we call aging. Observations from new mouse models and humans are discussed here to support the vascular aging theory. We develop a novel theory to explain the complexity of aging in mammals and perhaps in other organisms. The connection between vascular endothelial tissue and organismal aging provides a potential evolutionary conserved mechanism that is an ideal target for the development of therapies to prevent or delay age-related processes in humans.
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Affiliation(s)
- Jaime Font de Mora
- 1 Fundación para la Investigación Hospital La Fe and Instituto Valenciano de Patología, Facultad de Medicina, Universidad Católica de Valencia San Vicente Mártir , Valencia, Spain
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184
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Lecce L, Lam YT, Lindsay LA, Yuen SC, Simpson PJL, Handelsman DJ, Ng MKC. Aging impairs VEGF-mediated, androgen-dependent regulation of angiogenesis. Mol Endocrinol 2014; 28:1487-501. [PMID: 25058601 DOI: 10.1210/me.2013-1405] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
There is a progressive impairment of vascular repair mechanisms with advancing age concomitant with a steady decline in circulating androgen levels in men. Emerging evidence indicates androgens regulate angiogenesis; however, little research has focused on the impact of age upon androgen-mediated regulation of angiogenic mechanisms. Human dermal fibroblasts from young (<30 years) and older (>65 years) men were incubated with DHT, with or without androgen receptor antagonist hydroxyflutamide, or phosphoinositide 3-kinase inhibitor. Fibroblast-conditioned medium was used to stimulate angiogenic functions in human umbilical vein endothelial cells. Nuclear fractionation and fluorescence microscopy were used to study androgen receptor (AR) distribution. Conditioned medium from fibroblasts of young men, but not old men, treated with DHT produced a 3-fold increase in human umbilical vein endothelial cell tubulogenesis and 2-fold increase in migration via increased vascular endothelial growth factor (VEGF) expression and secretion, predominantly of VEGF145. DHT-induced VEGF secretion from fibroblasts of young men was AR-dependent and increased AKT phosphorylation, which was abrogated by phosphoinositide 3-kinase inhibition. By contrast, fibroblasts from older men were unresponsive to DHT and lacked androgen-mediated enhancement in VEGF production. These findings were associated with reduced AR nuclear translocation in old fibroblasts. The failure of DHT-induced paracrine stimulation of angiogenesis in fibroblasts from older men is likely due to defective nuclear translocation of AR. This first demonstration of androgen resistance (or insensitivity) acquired by human fibroblasts with aging suggests that pharmacological testosterone therapy for old men may be less effective in enhancing angiogenesis and facilitating tissue regeneration mechanisms reliant on paracrine release of VEGF.
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Affiliation(s)
- Laura Lecce
- The Heart Research Institute (L.L., Y.T.L., S.C.Y., P.J.L.S., M.K.C.N.), Newtown NSW Australia 2042; School of Medical Sciences (L.L., Y.T.L., L.A.L., S.C.Y., P.J.L.S., D.J.H., M.K.C.N.), The University of Sydney, New South Wales Australia 2006; ANZAC Research Institute (D.J.H.), University of Sydney, Concord Hospital New South Wales Australia 2139; and Royal Prince Alfred Hospital (M.K.C.N.), Camperdown New South Wales Australia 2050
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185
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Abstract
Donor organ scarcity remains a significant clinical challenge in transplantation. Older organs, increasingly utilized to meet the growing demand for donor organs, have been linked to inferior transplant outcomes. Susceptibility to organ injury, reduced repair capacity, and increased immunogenicity are interrelated and impacted by physiological and pathological aging processes. Insights into the underlying mechanisms are needed to develop age-specific interventional strategies with regards to organ preservation, immunosuppression, and allocation. In this overview, we summarize current knowledge of injury and repair mechanisms and the effects of aging relevant to transplantation.
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186
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Miao YL, Wu W, Li BW, Fang WW, Liu Y, Li L, Mi WD. Clinical Effectiveness of Gene Therapy on Critical Limb Ischemia. Vasc Endovascular Surg 2014; 48:372-7. [PMID: 24951292 DOI: 10.1177/1538574414539397] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Therapeutic angiogenesis using gene therapy is a novel strategy for the treatment of critical limb ischemia (CLI). We conducted a meta-analysis to evaluate the efficacy and safety of gene therapy for the treatment of CLI with no option of revascularization. Randomized placebo controlled trials of gene therapy on CLI were identified by searching PubMed (from 1990 to October 2013) and EMBASE (from 1990 to October 2013). Five eligible studies were selected for the meta-analysis. Among these studies, a total of 425 patients received gene therapy of either fibroblast growth factor 1 or hepatocyte growth factor, and 365 patients were given placebo. No statistical differences were observed between the 2 groups in major amputation or death at 1 year (risk ratio [RR], 0.83; 95% confidence interval [CI], 0.51-1.39; P = .48) and wound healing at 6 months (RR, 1.55; 95% CI, 0.73-3.28; P = .25). Gene therapy had similar occurrence of serious adverse events as control (RR, 1.05; 95% CI, 0.97-1.14; P = .23).
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Affiliation(s)
- Yu-Liang Miao
- Anesthesia and Operation Center, Chinese PLA General Hospital, Beijing 100853, China
- Department of Anesthesiology, PLA No. 306 Hospital, Beijing, China
| | - Wei Wu
- Department of Anesthesiology, PLA No. 306 Hospital, Beijing, China
| | - Bao-Wei Li
- Department of Anesthesiology, PLA No. 306 Hospital, Beijing, China
| | - Wei-Wu Fang
- Department of Anesthesiology, PLA No. 306 Hospital, Beijing, China
| | - Yan Liu
- Department of Anesthesiology, PLA No. 306 Hospital, Beijing, China
| | - Lu Li
- Department of Cardiothoracic Surgery, PLA No. 306 Hospital, Beijing, China
| | - Wei-Dong Mi
- Anesthesia and Operation Center, Chinese PLA General Hospital, Beijing 100853, China
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187
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Lin CHS, Chen J, Ziman B, Marshall S, Maizel J, Goligorsky MS. Endostatin and kidney fibrosis in aging: a case for antagonistic pleiotropy? Am J Physiol Heart Circ Physiol 2014; 306:H1692-9. [PMID: 24727495 DOI: 10.1152/ajpheart.00064.2014] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A recurring theme of a host of gerontologic studies conducted in either experimental animals or in humans is related to documenting the functional decline with age. We hypothesize that elevated circulating levels of a powerful antiangiogenic peptide, endostatin, represent one of the potent systemic causes for multiorgan microvascular rarefaction and functional decline due to fibrosis. It is possible that during the life span of an organism there is an accumulation of dormant transformed cells producing antiangiogenic substances (endostatin) that maintain the dormancy of such scattered malignant cells. The proof of this postulate cannot be obtained by physically documenting these scattered cells, and it rests exclusively on the detection of sequelae of shifted pro- and antiangiogenic balance toward the latter. Here we compared circulating levels of endostatin in young and aging mice of two different strains and showed that endostatin levels are elevated in the latter. Renal expression of endostatin increased ~5.6-fold in aging animals. This was associated with microvascular rarefaction and progressive tubulointerstitial fibrosis. In parallel, the levels of sirtuins 1 and 3 were significantly suppressed in aging mice in conjunction with the expression of markers of senescence. Treating young mice with endostatin for 28 days showed delayed recovery of circulation after femoral artery ligation and reduced patency of renal microvasculature but no fibrosis. In conclusion, the findings are consistent with the hypothesis on elevation of endostatin levels and parallel microvascular rarefaction and induction of renal fibrosis in aging mice.
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Affiliation(s)
- Chi Hua Sarah Lin
- Departments of Medicine, Pharmacology and Physiology, New York Medical College, Valhalla, New York
| | - Jun Chen
- Departments of Medicine, Pharmacology and Physiology, New York Medical College, Valhalla, New York
| | - Bruce Ziman
- Laboratory of Cardiovascular Science, National Institutes of Health, National Institute on Aging, Baltimore, Maryland
| | - Shannon Marshall
- Laboratory of Cardiovascular Science, National Institutes of Health, National Institute on Aging, Baltimore, Maryland
| | - Julien Maizel
- Department of Intensive Care Medicine, University of Amiens, Amiens, France
| | - Michael S Goligorsky
- Departments of Medicine, Pharmacology and Physiology, New York Medical College, Valhalla, New York,
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188
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Favero G, Paganelli C, Buffoli B, Rodella LF, Rezzani R. Endothelium and its alterations in cardiovascular diseases: life style intervention. BIOMED RESEARCH INTERNATIONAL 2014; 2014:801896. [PMID: 24719887 PMCID: PMC3955677 DOI: 10.1155/2014/801896] [Citation(s) in RCA: 155] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Accepted: 01/11/2014] [Indexed: 01/07/2023]
Abstract
The endothelium, which forms the inner cellular lining of blood vessels and lymphatics, is a highly metabolically active organ that is involved in many physiopathological processes, including the control of vasomotor tone, barrier function, leukocyte adhesion, and trafficking and inflammation. In this review, we summarized and described the following: (i) endothelial cell function in physiological conditions and (ii) endothelial cell activation and dysfunction in the main cardiovascular diseases (such as atherosclerosis, and hypertension) and to diabetes, cigarette smoking, and aging physiological process. Finally, we presented the currently available evidence that supports the beneficial effects of physical activity and various dietary compounds on endothelial functions.
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Affiliation(s)
- Gaia Favero
- Section of Anatomy and Physiopathology, Department of Clinical and Experimental Sciences, University of Brescia, Viale Europa 11, 25123 Brescia, Italy
| | - Corrado Paganelli
- Department of Medical and Surgical Specialties, Radiological Sciences and Public Health, University of Brescia, Viale Europa 11, 25123 Brescia, Italy
| | - Barbara Buffoli
- Section of Anatomy and Physiopathology, Department of Clinical and Experimental Sciences, University of Brescia, Viale Europa 11, 25123 Brescia, Italy
| | - Luigi Fabrizio Rodella
- Section of Anatomy and Physiopathology, Department of Clinical and Experimental Sciences, University of Brescia, Viale Europa 11, 25123 Brescia, Italy
| | - Rita Rezzani
- Section of Anatomy and Physiopathology, Department of Clinical and Experimental Sciences, University of Brescia, Viale Europa 11, 25123 Brescia, Italy
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189
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Mauge L, Sabatier F, Boutouyrie P, D'Audigier C, Peyrard S, Bozec E, Blanchard A, Azizi M, Dizier B, Dignat-George F, Gaussem P, Smadja DM. Forearm ischemia decreases endothelial colony-forming cell angiogenic potential. Cytotherapy 2014; 16:213-24. [DOI: 10.1016/j.jcyt.2013.09.007] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2013] [Revised: 09/18/2013] [Accepted: 09/28/2013] [Indexed: 01/03/2023]
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190
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Feder D, Perrazo FF, Pereira EC, Forsait S, Feder CKR, Junqueira PEB, Junqueira VBC, Azzalis LA, Fonseca FLA. Standardization of a method to study angiogenesis in a mouse model. AN ACAD BRAS CIENC 2013; 85:1483-7. [PMID: 24346800 DOI: 10.1590/0001-3765201378011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2011] [Accepted: 11/23/2012] [Indexed: 11/22/2022] Open
Abstract
In the adult organism, angiogenesis is restricted to a few physiological conditions. On the other hand, uncontrolled angiogenesis have often been associated to angiogenesis-dependent pathologies. A variety of animal models have been described to provide more quantitative analysis of in vivo angiogenesis and to characterize pro- and antiangiogenic molecules. However, it is still necessary to establish a quantitative, reproducible and specific method for studies of angiogenesis factors and inhibitors. This work aimed to standardize a method for the study of angiogenesis and to investigate the effects of thalidomide on angiogenesis. Sponges of 0.5 x 0.5 x 0.5 cm were implanted in the back of mice groups, control and experimental (thalidomide 200 mg/K/day by gavage). After seven days, the sponges were removed. The dosage of hemoglobin in sponge and in circulation was performed and the ratio between the values was tested using nonparametric Mann-Whitney test. Results have shown that sponge-induced angiogenesis quantitated by ratio between hemoglobin content in serum and in sponge is a helpful model for in vivo studies on angiogenesis. Moreover, it was observed that sponge-induced angiogenesis can be suppressed by thalidomide, corroborating to the validity of the standardized method.
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Affiliation(s)
- David Feder
- Disciplina de Farmacologia, Departamento de Morfologia e Fisiologia, Faculdade de Medicina do ABC, 09060-650Santo AndréSP, Brasil
| | - Fabio F Perrazo
- Departamento de Ciências Exatas e da Terra, Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo, 09972-270DiademaSP, Brasil
| | - Edimar C Pereira
- Departamento de Ciências Biológicas, Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo, 09972-270DiademaSP, Brasil
| | - Silvana Forsait
- Disciplina de Farmacologia, Departamento de Morfologia e Fisiologia, Faculdade de Medicina do ABC, 09060-650Santo AndréSP, Brasil
| | - Cecília K R Feder
- Disciplina de Farmacologia, Departamento de Morfologia e Fisiologia, Faculdade de Medicina do ABC, 09060-650Santo AndréSP, Brasil
| | - Paulo E B Junqueira
- Disciplina de Farmacologia, Departamento de Morfologia e Fisiologia, Faculdade de Medicina do ABC, 09060-650Santo AndréSP, Brasil
| | - Virginia B C Junqueira
- Departamento de Ciências Biológicas, Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo, 09972-270DiademaSP, Brasil
| | - Ligia A Azzalis
- Departamento de Ciências Exatas e da Terra, Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo, 09972-270DiademaSP, Brasil
| | - Fernando L A Fonseca
- Disciplina de Farmacologia, Departamento de Morfologia e Fisiologia, Faculdade de Medicina do ABC, 09060-650Santo AndréSP, Brasil
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191
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Soares H, Marinho HS, Real C, Antunes F. Cellular polarity in aging: role of redox regulation and nutrition. GENES AND NUTRITION 2013; 9:371. [PMID: 24306961 DOI: 10.1007/s12263-013-0371-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Accepted: 11/19/2013] [Indexed: 02/06/2023]
Abstract
Cellular polarity concerns the spatial asymmetric organization of cellular components and structures. Such organization is important not only for biological behavior at the individual cell level, but also for the 3D organization of tissues and organs in living organisms. Processes like cell migration and motility, asymmetric inheritance, and spatial organization of daughter cells in tissues are all dependent of cell polarity. Many of these processes are compromised during aging and cellular senescence. For example, permeability epithelium barriers are leakier during aging; elderly people have impaired vascular function and increased frequency of cancer, and asymmetrical inheritance is compromised in senescent cells, including stem cells. Here, we review the cellular regulation of polarity, as well as the signaling mechanisms and respective redox regulation of the pathways involved in defining cellular polarity. Emphasis will be put on the role of cytoskeleton and the AMP-activated protein kinase pathway. We also discuss how nutrients can affect polarity-dependent processes, both by direct exposure of the gastrointestinal epithelium to nutrients and by indirect effects elicited by the metabolism of nutrients, such as activation of antioxidant response and phase-II detoxification enzymes through the transcription factor nuclear factor (erythroid-derived 2)-like 2 (Nrf2). In summary, cellular polarity emerges as a key process whose redox deregulation is hypothesized to have a central role in aging and cellular senescence.
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Affiliation(s)
- Helena Soares
- Departamento de Química e Bioquímica, Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Lisbon, Portugal
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192
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Gong M, Yu B, Wang YG, Xu M. Bone marrow rejuvenation. An excellent potential therapy for age-related endothelial dysfunction. Circ J 2013; 77:2886-8. [PMID: 24132244 DOI: 10.1253/circj.cj-13-1219] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Min Gong
- Department of Pathology and Laboratory Medicine, University of Cincinnati Medical Center
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193
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Moccia F, Dragoni S, Cinelli M, Montagnani S, Amato B, Rosti V, Guerra G, Tanzi F. How to utilize Ca²⁺ signals to rejuvenate the repairative phenotype of senescent endothelial progenitor cells in elderly patients affected by cardiovascular diseases: a useful therapeutic support of surgical approach? BMC Surg 2013; 13 Suppl 2:S46. [PMID: 24267290 PMCID: PMC3851045 DOI: 10.1186/1471-2482-13-s2-s46] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Endothelial dysfunction or loss is the early event that leads to a host of severe cardiovascular diseases, such as atherosclerosis, hypertension, brain stroke, myocardial infarction, and peripheral artery disease. Ageing is regarded among the most detrimental risk factor for vascular endothelium and predisposes the subject to atheroscleorosis and inflammatory states even in absence of traditional comorbid conditions. Standard treatment to restore blood perfusion through stenotic arteries are surgical or endovascular revascularization. Unfortunately, ageing patients are not the most amenable candidates for such interventions, due to high operative risk or unfavourable vascular involvement. It has recently been suggested that the transplantation of autologous bone marrow-derived endothelial progenitor cells (EPCs) might constitute an alternative and viable therapeutic option for these individuals. Albeit pre-clinical studies demonstrated the feasibility of EPC-based therapy to recapitulate the diseased vasculature of young and healthy animals, clinical studies provided less impressive results in old ischemic human patients. One hurdle associated to this kind of approach is the senescence of autologous EPCs, which are less abundant in peripheral blood and display a reduced pro-angiogenic activity. Conversely, umbilical cord blood (UCB)-derived EPCs are more suitable for cellular therapeutics due to their higher frequency and sensitivity to growth factors, such as vascular endothelial growth factor (VEGF). An increase in intracellular Ca2+ concentration is central to EPC activation by VEGF. We have recently demonstrated that the Ca2+ signalling machinery driving the oscillatory Ca2+ response to this important growth factor is different in UCB-derived EPCs as compared to their peripheral counterparts. In particular, we focussed on the so-called endothelial colony forming cells (ECFCs), which are the only EPC population belonging to the endothelial lineage and able to form capillary-like structures in vitro and stably integrate with host vasculature in vivo. The present review provides a brief description of how exploiting the Ca2+ toolkit of juvenile EPCs to restore the repairative phenotype of senescent EPCs to enhance their regenerative outcome in therapeutic settings.
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Rengo G, Parisi V, Femminella GD, Pagano G, de Lucia C, Cannavo A, Liccardo D, Giallauria F, Scala O, Zincarelli C, Perrone Filardi P, Ferrara N, Leosco D. Molecular aspects of the cardioprotective effect of exercise in the elderly. Aging Clin Exp Res 2013; 25:487-97. [PMID: 23949971 DOI: 10.1007/s40520-013-0117-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2012] [Accepted: 04/09/2013] [Indexed: 01/01/2023]
Abstract
Aging is a well-recognized risk factor for several different forms of cardiovascular disease. However, mechanisms by which aging exerts its negative effect on outcome have been only partially clarified. Numerous evidence indicate that aging is associated with alterations of several mechanisms whose integrity confers protective action on the heart and vasculature. The present review aims to focus on the beneficial effects of exercise, which plays a pivotal role in primary and secondary prevention of cardiovascular diseases, in counteracting age-related deterioration of protective mechanisms that are crucially involved in the homeostasis of cardiovascular system. In this regard, animal and human studies indicate that exercise training is able: (1) to improve the inotropic reserve of the aging heart through restoration of cardiac β-adrenergic receptor signaling; (2) to rescue the mechanism of cardiac preconditioning and angiogenesis whose integrity has been shown to confer cardioprotection against ischemia and to improve post-myocardial infarction left ventricular remodeling; (3) to counteract age-related reduction of antioxidant systems that is associated to decreased cellular resistance to reactive oxygen species accumulation. Moreover, this review also describes the molecular effects induced by different exercise training protocols (endurance vs. resistance) in the attempt to better explain what kind of exercise strategy could be more efficacious to improve cardiovascular performance in the elderly population.
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Affiliation(s)
- Giuseppe Rengo
- Dipartimento di Scienze Mediche Traslazionali, Università degli Studi di Napoli Federico II, via Sergio Pansini, 5, 80131, Naples, Italy
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Contrasting roles of E2F2 and E2F3 in cardiac neovascularization. PLoS One 2013; 8:e65755. [PMID: 23799044 PMCID: PMC3683051 DOI: 10.1371/journal.pone.0065755] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Accepted: 04/29/2013] [Indexed: 01/23/2023] Open
Abstract
Insufficient neovascularization, characterized by poor endothelial cell (EC) growth, contributes to the pathogenesis of ischemic heart disease and limits cardiac tissue preservation and regeneration. The E2F family of transcription factors are critical regulators of the genes responsible for cell-cycle progression and growth; however, the specific roles of individual E2Fs in ECs are not well understood. Here we investigated the roles of E2F2 and E2F3 in EC growth, angiogenesis, and their functional impact on myocardial infarction (MI). An endothelial-specific E2F3-deficient mouse strain VE-Cre; E2F3(fl/fl) was generated, and MI was surgically induced in VE-Cre; E2F3(fl/fl) and E2F2-null (E2F2 KO) mice and their wild-type (WT) littermates, VE-Cre; E2F3(+/+) and E2F2 WT, respectively. The cardiac function, infarct size, and vascular density were significantly better in E2F2 KO mice and significantly worse in VE-Cre; E2F3(fl/fl) mice than in their WT littermates. The loss of E2F2 expression was associated with an increase in the proliferation of ECs both in vivo and in vitro, while the loss of E2F3 expression led to declines in EC proliferation. Thus, E2F3 promotes while E2F2 suppresses ischemic cardiac repair through corresponding changes in EC proliferation; and differential targeting of specific E2F members may provide a novel strategy for therapeutic angiogenesis of ischemic heart disease.
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Circulation Research
Thematic Synopsis: Cardiovascular Development. Circ Res 2013. [DOI: 10.1161/circresaha.113.301305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Dragneva G, Korpisalo P, Ylä-Herttuala S. Promoting blood vessel growth in ischemic diseases: challenges in translating preclinical potential into clinical success. Dis Model Mech 2013; 6:312-22. [PMID: 23471910 PMCID: PMC3597014 DOI: 10.1242/dmm.010413] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Angiogenic therapy, which involves the use of an exogenous stimulus to promote blood vessel growth, is an attractive approach for the treatment of ischemic diseases. It has been shown in animal models that the stimulation of blood vessel growth leads to the growth of the whole vascular tree, improvement of ischemic tissue perfusion and improved muscle aerobic energy metabolism. However, very few positive results have been gained from Phase 2 and 3 clinical angiogenesis trials. Many reasons have been given for the failures of clinical trials, including poor transgene expression (in gene-therapy trials) and instability of the vessels induced by therapy. In this Review, we discuss the selection of preclinical models as one of the main reasons why clinical translation has been unsuccessful thus far. This issue has received little attention, but could have had dramatic implications on the expectations of clinical trials. We highlight crucial differences between human patients and animal models with regards to blood flow and pressure, as well as issues concerning the chronic nature of ischemic diseases in humans. We use these as examples to demonstrate why the results from preclinical trials might have overestimated the efficacy of angiogenic therapies developed to date. We also suggest ways in which currently available animal models of ischemic disease could be improved to better mimic human disease conditions, and offer advice on how to work with existing models to avoid overestimating the efficacy of new angiogenic therapies.
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Affiliation(s)
- Galina Dragneva
- Department of Biotechnology and Molecular Medicine, A. I. Virtanen Institute, University of Eastern Finland, FI-70211 Kuopio, Finland
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Puca AA, Carrizzo A, Ferrario A, Villa F, Vecchione C. Endothelial nitric oxide synthase, vascular integrity and human exceptional longevity. IMMUNITY & AGEING 2012; 9:26. [PMID: 23153280 PMCID: PMC3538508 DOI: 10.1186/1742-4933-9-26] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/06/2012] [Accepted: 11/13/2012] [Indexed: 12/16/2022]
Abstract
Aging is the sum of the deleterious changes that occur as time goes by. It is the main risk factor for the development of cardiovascular disease, and aging of the vasculature is the event that most often impacts on the health of elderly people. The “free-radical theory of aging” was proposed to explain aging as a consequence of the accumulation of reactive oxygen species (ROS). However, recent findings contradict this theory, and it now seems that mechanisms mediating longevity act through induction of oxidative stress. In fact, calorie restriction − a powerful way of delaying aging − increases ROS accumulation due to stimulation of the basal metabolic rate; moreover, reports show that antioxidant therapy is detrimental to healthy aging. We also now know that genetic manipulation of the insulin-like-growth-factor-1/insulin signal (IIS) has a profound impact on the rate of aging and that the IIS is modulated by calorie restriction and physical exercise. The IIS regulates activation of nitric oxide synthase (eNOS), the activity of which is essential to improving lifespan through calorie restriction, as demonstrated by experiments on eNOS knockout mice. Indeed, eNOS has a key role in maintaining vascular integrity during aging by activating vasorelaxation and allowing migration and angiogenesis. In this review, we will overview current literature on these topics and we will try to convince the reader of the importance of vascular integrity and nitric oxide production in determining healthy aging.
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Martín-Pardillos A, Sosa C, Sorribas V. Arsenic Increases Pi-Mediated Vascular Calcification and Induces Premature Senescence in Vascular Smooth Muscle Cells. Toxicol Sci 2012; 131:641-53. [DOI: 10.1093/toxsci/kfs313] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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