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Córdova-Oriz I, Polonio AM, Cuadrado-Torroglosa I, Chico-Sordo L, Medrano M, García-Velasco JA, Varela E. Chromosome ends and the theory of marginotomy: implications for reproduction. Biogerontology 2024; 25:227-248. [PMID: 37943366 DOI: 10.1007/s10522-023-10071-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Accepted: 09/21/2023] [Indexed: 11/10/2023]
Abstract
Telomeres are the protective structures located at the ends of linear chromosomes. They were first described in the 1930s, but their biology remained unexplored until the early 70s, when Alexey M. Olovnikov, a theoretical biologist, suggested that telomeres cannot be fully copied during DNA replication. He proposed a theory that linked this phenomenon with the limit of cell proliferation capacity and the "duration of life" (theory of marginotomy), and suggested a potential of telomere lenghthening for the prevention of aging (anti-marginotomy). The impact of proliferative telomere shortening on life expectancy was later confirmed. In humans, telomere shortening is counteracted by telomerase, an enzyme that is undetectable in most adult somatic cells, but present in cancer cells and adult and embryonic stem and germ cells. Although telomere length dynamics are different in male and female gametes during gametogenesis, telomere lengths are reset at the blastocyst stage, setting the initial length of the species. The role of the telomere pathway in reproduction has been explored for years, mainly because of increased infertility resulting from delayed childbearing. Short telomere length in ovarian somatic cells is associated to decreased fertility and higher aneuploidy rates in embryos. Consequently, there is a growing interest in telomere lengthening strategies, aimed at improving fertility. It has also been observed that lifestyle factors can affect telomere length and improve fertility outcomes. In this review, we discuss the implications of telomere theory in fertility, especially in oocytes, spermatozoa, and embryos, as well as therapies to enhance reproductive success.
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Affiliation(s)
- Isabel Córdova-Oriz
- IVIRMA Global Research Alliance, Instituto de Investigación Sanitaria La Fe (IIS La Fe), Valencia, Spain
| | - Alba M Polonio
- IVIRMA Global Research Alliance, Instituto de Investigación Sanitaria La Fe (IIS La Fe), Valencia, Spain
| | - Isabel Cuadrado-Torroglosa
- IVIRMA Global Research Alliance, Instituto de Investigación Sanitaria La Fe (IIS La Fe), Valencia, Spain
| | - Lucía Chico-Sordo
- IVIRMA Global Research Alliance, Instituto de Investigación Sanitaria La Fe (IIS La Fe), Valencia, Spain
| | - Marta Medrano
- IVIRMA Global Research Alliance, Instituto de Investigación Sanitaria La Fe (IIS La Fe), Valencia, Spain
| | - Juan A García-Velasco
- IVIRMA Global Research Alliance, Instituto de Investigación Sanitaria La Fe (IIS La Fe), Valencia, Spain
- IVIRMA Global Research Alliance, IVIRMA Madrid, Madrid, Spain
- Department of Medical Specialties and Public Health, Edificio Departamental II, Rey Juan Carlos University, Av. de Atenas, s/n, 28922, Alcorcón, Madrid, Spain
| | - Elisa Varela
- IVIRMA Global Research Alliance, Instituto de Investigación Sanitaria La Fe (IIS La Fe), Valencia, Spain.
- Department of Medical Specialties and Public Health, Edificio Departamental II, Rey Juan Carlos University, Av. de Atenas, s/n, 28922, Alcorcón, Madrid, Spain.
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Hoffman TW, van Moorsel CH, van der Vis JJ, Biesma DH, Grutters JC. No effect of danazol treatment in patients with advanced idiopathic pulmonary fibrosis. ERJ Open Res 2023; 9:00131-2023. [PMID: 37753281 PMCID: PMC10518878 DOI: 10.1183/23120541.00131-2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Accepted: 08/14/2023] [Indexed: 09/28/2023] Open
Abstract
Background Telomere dysfunction can underly the development of idiopathic pulmonary fibrosis (IPF), and recent work suggests that patients with telomere syndromes might benefit from treatment with androgens, such as danazol. Methods This was a prospective observational cohort study. 50 patients with IPF received off-label treatment with danazol after they showed progressive disease under treatment with pirfenidone or nintedanib. The primary outcome was the difference in yearly decline in forced vital capacity (FVC) prior to (pre) and after (post) start of treatment with danazol. Results There was no significant difference in FVC-decline between 1 year pre and 1 year post start of danazol treatment (mean decline pre 395 mL (95% confidence interval (CI) 290-500) compared to post 461 mL (95% CI 259-712); p=0.46; paired t-test). 11 patients (22%) were still on danazol after 1 year, and 39 patients had stopped danazol, mainly because of side-effects (56%) or death (33%). In patients who were still using danazol after 1 year, FVC-decline significantly slowed down under danazol treatment (mean pre 512 mL (95% CI 308-716) versus post 198 mL (95% CI 16-380); p=0.04). Median survival post danazol was 14.9 months (95% CI 11.0-18.8). Conclusion Danazol as a treatment of last resort in patients with IPF did not lead to slowing of lung function decline and was associated with significant side-effects. It remains to be determined if earlier treatment or treatment of specific patient subgroups is beneficial.
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Affiliation(s)
- Thijs W. Hoffman
- Interstitial Lung Diseases Center of Excellence, Department of Pulmonology, St Antonius Hospital, Nieuwegein, The Netherlands
| | - Coline H.M. van Moorsel
- Interstitial Lung Diseases Center of Excellence, Department of Pulmonology, St Antonius Hospital, Nieuwegein, The Netherlands
| | - Joanne J. van der Vis
- Interstitial Lung Diseases Center of Excellence, Department of Pulmonology, St Antonius Hospital, Nieuwegein, The Netherlands
- Department of Clinical Chemistry, St Antonius Hospital, Nieuwegein, The Netherlands
| | - Douwe H. Biesma
- Department of Internal Medicine, St Antonius Hospital, Nieuwegein, The Netherlands
- Department of Internal Medicine, Leiden University Medical Centre, Leiden, The Netherlands
| | - Jan C. Grutters
- Interstitial Lung Diseases Center of Excellence, Department of Pulmonology, St Antonius Hospital, Nieuwegein, The Netherlands
- Division of Heart and Lungs, University Medical Center, Utrecht, The Netherlands
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3
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Caria P, Pilotto S, D'Alterio MN, Fronza M, Murgia F, Frau J, Fenu G, Dettori T, Frau DV, Atzori L, Angioni S, Cocco E, Lorefice L. Leukocyte telomere length in women with multiple sclerosis: Comparison with healthy women during pregnancy and puerperium. J Neuroimmunol 2023; 381:578137. [PMID: 37356355 DOI: 10.1016/j.jneuroim.2023.578137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Revised: 05/26/2023] [Accepted: 06/19/2023] [Indexed: 06/27/2023]
Abstract
OBJECTIVES Several studies indicated leukocyte telomere length (LTL) as a biomarker of multiple sclerosis (MS) evolution. This study aimed to investigate LTL in women with multiple sclerosis (MS) compared to that in healthy women (HW) across different reproductive phases, and to evaluate its relationship with MS activity. METHODS Blood samples were collected from women with MS and HW during the fertile phase, pregnancy, and puerperium. LTL was determined using quantitative fluorescence in situ hybridization (Q-FISH). RESULTS Blood samples from 68 women with MS (22 during fertile life, 23 during pregnancy, and 23 post-partum) and 52 HW (23 during fertile life, 20 during pregnancy, and 9 post-partum) were analyzed. During pregnancy, LTL in MS women and HW was 84.7 ± 10.5 and 77.6 ± 11.5, respectively (p < 0.005). Regression analysis showed that shorter LTL was associated with pregnancy in HW (p = 0.021); this relationship was not observed in MS women, for whom shorter LTL was related to a higher EDSS (p = 0.036). A longitudinal analysis was performed in eight MS women, showing LTL shortening from pregnancy to puerperium (p = 0.003), which was related to MS reactivation (p = 0.042). CONCLUSION Our results highlight the possible associations between LTL, reproductive biological phases, and MS activity after delivery.
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Affiliation(s)
- P Caria
- Department of Biomedical Sciences, University of Cagliari, Cagliari, Italy
| | - S Pilotto
- Multiple Sclerosis Center, Binaghi Hospital, ASL Cagliari, Department of Medical Sciences and Public Health, University of Cagliari, Italy
| | - M N D'Alterio
- Division of Gynecology and Obstetrics, Department of Surgical Sciences, University of Cagliari, Cagliari, Italy
| | - M Fronza
- Multiple Sclerosis Center, Binaghi Hospital, ASL Cagliari, Department of Medical Sciences and Public Health, University of Cagliari, Italy
| | - F Murgia
- Clinical Metabolomics Unit, Department of Biomedical Sciences, University of Cagliari, Italy
| | - J Frau
- Multiple Sclerosis Center, Binaghi Hospital, ASL Cagliari, Department of Medical Sciences and Public Health, University of Cagliari, Italy
| | - G Fenu
- Department of Neurosciences, ARNAS Brotzu, Cagliari, Italy
| | - T Dettori
- Department of Biomedical Sciences, University of Cagliari, Cagliari, Italy
| | - D V Frau
- Department of Biomedical Sciences, University of Cagliari, Cagliari, Italy
| | - L Atzori
- Clinical Metabolomics Unit, Department of Biomedical Sciences, University of Cagliari, Italy
| | - S Angioni
- Division of Gynecology and Obstetrics, Department of Surgical Sciences, University of Cagliari, Cagliari, Italy
| | - E Cocco
- Multiple Sclerosis Center, Binaghi Hospital, ASL Cagliari, Department of Medical Sciences and Public Health, University of Cagliari, Italy
| | - L Lorefice
- Multiple Sclerosis Center, Binaghi Hospital, ASL Cagliari, Department of Medical Sciences and Public Health, University of Cagliari, Italy.
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Córdova-Oriz I, Kohls G, Iglesias C, Polonio AM, Chico-Sordo L, Toribio M, Meseguer M, Varela E, Pellicer A, García-Velasco JA. A Randomized Controlled Intervention Trial with Danazol to Improve Telomeric and Fertility Parameters in Women with Diminished Ovarian Reserve: A Pilot Study. WOMEN'S HEALTH REPORTS (NEW ROCHELLE, N.Y.) 2023; 4:305-318. [PMID: 37476605 PMCID: PMC10354732 DOI: 10.1089/whr.2023.0013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Accepted: 06/07/2023] [Indexed: 07/22/2023]
Abstract
Background Most women who are treated at in vitro fertilization (IVF) clinics have trouble conceiving due to ovarian failure (OF), which seems to be associated to short telomeres and reduced or absent telomerase activity in their granulosa cells. Indeed, telomere pathways are involved in organ dysfunction. However, sexual steroids can stimulate the expression of the telomerase gene and have been successfully used to prevent telomere attrition. Thus, a strategy to improve IVF outcomes in women with OF could be telomerase reactivation using sexual steroids. Methods We conducted a double-blind, placebo-controlled study. Patients with diminished ovarian reserve were randomized to Danazol or placebo for 3 months. We included patients with normal ovarian reserve in the study as untreated controls. Patients and controls underwent several ovarian stimulations (OSs). Telomere and IVF parameters were assessed. Results We found that the mean telomere length in blood and the percentage of short and long telomeres were similar throughout the 3 months of treatment with Danazol. Remarkably, while the number of cells with one telomeric repeat-containing RNA (TERRA) focus decreased (p = 0.04) after the first month of Danazol treatment, the number of cells with 2 to 4 TERRA foci increased (p = 0.02). Regarding fertility, no differences were found in the antral follicle count. Interestingly, in OS performed after the trial, all Danazol-treated patients had a better MII oocyte rate compared to OS performed before the pilot study.EudraCT number: 2018-004400-19. Conclusions Danazol treatment seemed to affect telomere maintenance, since both the number of TERRA foci and the ratio of MII oocytes changed. However, further research is needed to confirm these results.
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Affiliation(s)
- Isabel Córdova-Oriz
- The Health Research Institute La Fe (IIS La Fe), IVI Foundation, Valencia, Spain
| | | | | | - Alba M. Polonio
- The Health Research Institute La Fe (IIS La Fe), IVI Foundation, Valencia, Spain
| | - Lucía Chico-Sordo
- The Health Research Institute La Fe (IIS La Fe), IVI Foundation, Valencia, Spain
| | | | - Marcos Meseguer
- The Health Research Institute La Fe (IIS La Fe), IVI Foundation, Valencia, Spain
- Laboratory of In Vitro Fertilization, IVIRMA Valencia, Valencia, Spain
| | - Elisa Varela
- The Health Research Institute La Fe (IIS La Fe), IVI Foundation, Valencia, Spain
- Department of Medical Specialties and Public Health, Rey Juan Carlos University, Madrid, Spain
| | - Antonio Pellicer
- The Health Research Institute La Fe (IIS La Fe), IVI Foundation, Valencia, Spain
- School of Medicine, Department of Obstetrics and Gynecology, University of Valencia, Valencia, Spain
- IVIRMA Rome, Rome, Italy
| | - Juan A. García-Velasco
- The Health Research Institute La Fe (IIS La Fe), IVI Foundation, Valencia, Spain
- IVIRMA Madrid, Madrid, Spain
- Department of Medical Specialties and Public Health, Rey Juan Carlos University, Madrid, Spain
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Penrice DD, Jalan-Sakrikar N, Jurk D, Passos JF, Simonetto DA. Telomere dysfunction in chronic liver disease: The link from aging. Hepatology 2023:01515467-990000000-00410. [PMID: 37102475 PMCID: PMC10848919 DOI: 10.1097/hep.0000000000000426] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Accepted: 04/20/2023] [Indexed: 04/28/2023]
Affiliation(s)
- Daniel D. Penrice
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, Minnesota, USA
| | - Nidhi Jalan-Sakrikar
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, Minnesota, USA
| | - Diana Jurk
- Department of Physiology and Biomedical Engineering, Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, Minnesota, USA
| | - João F. Passos
- Department of Physiology and Biomedical Engineering, Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, Minnesota, USA
| | - Douglas A. Simonetto
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, Minnesota, USA
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Ogłuszka M, Lipiński P, Starzyński RR. Effect of Omega-3 Fatty Acids on Telomeres-Are They the Elixir of Youth? Nutrients 2022; 14:nu14183723. [PMID: 36145097 PMCID: PMC9504755 DOI: 10.3390/nu14183723] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 09/05/2022] [Accepted: 09/06/2022] [Indexed: 11/17/2022] Open
Abstract
Telomeres are complexes consisting of tandem repeat DNA combined with associated proteins that play a key role in protecting the ends of chromosomes and maintaining genome stability. They are considered a biological clock, as they shorten in parallel with aging. Furthermore, short telomeres are associated with several age-related diseases. However, the variability in telomere shortening independent of chronological age suggests that it is a modifiable factor. In fact, it is regulated inter alia by genetic damage, cell division, aging, oxidative stress, and inflammation. A key question remains: how can we prevent accelerated telomere attrition and subsequent premature replicative senescence? A number of studies have explored the possible impact of omega-3 fatty acids on telomere shortening. This review summarizes published cross-sectional studies, randomized controlled trials, and rodent studies investigating the role of omega-3 fatty acids in telomere biology. It also covers a broad overview of the mechanism, currently favored in the field, that explains the impact of omega-3 fatty acids on telomeres—the food compound’s ability to modulate oxidative stress and inflammation. Although the results of the studies performed to date are not consistent, the vast majority indicate a beneficial effect of omega-3 fatty acids on telomere length.
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Affiliation(s)
- Magdalena Ogłuszka
- Department of Genomics, Institute of Genetics and Animal Biotechnology of the Polish Academy of Sciences, 05-552 Jastrzębiec, Poland
| | - Paweł Lipiński
- Department of Molecular Biology, Institute of Genetics and Animal Biotechnology of the Polish Academy of Sciences, 05-552 Jastrzębiec, Poland
| | - Rafał R. Starzyński
- Department of Molecular Biology, Institute of Genetics and Animal Biotechnology of the Polish Academy of Sciences, 05-552 Jastrzębiec, Poland
- Correspondence:
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Taheri M, Ghafouri-Fard S, Najafi S, Kallenbach J, Keramatfar E, Atri Roozbahani G, Heidari Horestani M, Hussen BM, Baniahmad A. Hormonal regulation of telomerase activity and hTERT expression in steroid-regulated tissues and cancer. Cancer Cell Int 2022; 22:258. [PMID: 35974340 PMCID: PMC9380309 DOI: 10.1186/s12935-022-02678-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Accepted: 08/05/2022] [Indexed: 11/10/2022] Open
Abstract
Naturally, in somatic cells chromosome ends (telomeres) shorten during each cell division. This process ensures to limit proliferation of somatic cells to avoid malignant proliferation; however, it leads to proliferative senescence. Telomerase contains the reverse transcriptase TERT, which together with the TERC component, is responsible for protection of genome integrity by preventing shortening of telomeres through adding repetitive sequences. In addition, telomerase has non-telomeric function and supports growth factor independent growth. Unlike somatic cells, telomerase is detectable in stem cells, germ line cells, and cancer cells to support self-renewal and expansion. Elevated telomerase activity is reported in almost all of human cancers. Increased expression of hTERT gene or its reactivation is required for limitless cellular proliferation in immortal malignant cells. In hormonally regulated tissues as well as in prostate, breast and endometrial cancers, telomerase activity and hTERT expression are under control of steroid sex hormones and growth factors. Also, a number of hormones and growth factors are known to play a role in the carcinogenesis via regulation of hTERT levels or telomerase activity. Understanding the role of hormones in interaction with telomerase may help finding therapeutical targets for anticancer strategies. In this review, we outline the roles and functions of several steroid hormones and growth factors in telomerase regulation, particularly in hormone regulated cancers such as prostate, breast and endometrial cancer.
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Affiliation(s)
- Mohammad Taheri
- Urology and Nephrology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.,Institute of Human Genetics, Jena University Hospital, 07740, Jena, Germany
| | - Soudeh Ghafouri-Fard
- Department of Medical Genetics, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Sajad Najafi
- Department of Medical Biotechnology, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Julia Kallenbach
- Institute of Human Genetics, Jena University Hospital, 07740, Jena, Germany
| | - Elmira Keramatfar
- Institute of Human Genetics, Jena University Hospital, 07740, Jena, Germany
| | | | | | - Bashdar Mahmud Hussen
- Department of Pharmacognosy, College of Pharmacy, Hawler Medical University, Kurdistan Region, Erbil, Iraq.,Center of Research and Strategic Studies, Lebanese French University, Erbil, Kurdistan Region, Iraq
| | - Aria Baniahmad
- Institute of Human Genetics, Jena University Hospital, 07740, Jena, Germany.
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8
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Ma H, Wu X, Li Y, Xia Y. Research Progress in the Molecular Mechanisms, Therapeutic Targets, and Drug Development of Idiopathic Pulmonary Fibrosis. Front Pharmacol 2022; 13:963054. [PMID: 35935869 PMCID: PMC9349351 DOI: 10.3389/fphar.2022.963054] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Accepted: 06/24/2022] [Indexed: 12/12/2022] Open
Abstract
Idiopathic pulmonary fibrosis (IPF) is a fatal interstitial lung disease. Recent studies have identified the key role of crosstalk between dysregulated epithelial cells, mesenchymal, immune, and endothelial cells in IPF. In addition, genetic mutations and environmental factors (e.g., smoking) have also been associated with the development of IPF. With the recent development of sequencing technology, epigenetics, as an intermediate link between gene expression and environmental impacts, has also been reported to be implicated in pulmonary fibrosis. Although the etiology of IPF is unknown, many novel therapeutic targets and agents have emerged from clinical trials for IPF treatment in the past years, and the successful launch of pirfenidone and nintedanib has demonstrated the promising future of anti-IPF therapy. Therefore, we aimed to gain an in-depth understanding of the underlying molecular mechanisms and pathogenic factors of IPF, which would be helpful for the diagnosis of IPF, the development of anti-fibrotic drugs, and improving the prognosis of patients with IPF. In this study, we summarized the pathogenic mechanism, therapeutic targets and clinical trials from the perspective of multiple cell types, gene mutations, epigenetic and environmental factors.
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Affiliation(s)
- Hongbo Ma
- Department of Rehabilitation Medicine, State Key Laboratory of Biotherapy and Cancer Center, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, China
- West China School of Pharmacy, Sichuan University, Chengdu, China
| | - Xuyi Wu
- Department of Rehabilitation Medicine, State Key Laboratory of Biotherapy and Cancer Center, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, China
- Key Laboratory of Rehabilitation Medicine in Sichuan Province/Rehabilitation Medicine Research Institute, Chengdu, China
| | - Yi Li
- Department of Rehabilitation Medicine, State Key Laboratory of Biotherapy and Cancer Center, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, China
- Key Laboratory of Rehabilitation Medicine in Sichuan Province/Rehabilitation Medicine Research Institute, Chengdu, China
| | - Yong Xia
- Department of Rehabilitation Medicine, State Key Laboratory of Biotherapy and Cancer Center, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, China
- Key Laboratory of Rehabilitation Medicine in Sichuan Province/Rehabilitation Medicine Research Institute, Chengdu, China
- *Correspondence: Yong Xia,
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Metabolic Alterations in Cellular Senescence: The Role of Citrate in Ageing and Age-Related Disease. Int J Mol Sci 2022; 23:ijms23073652. [PMID: 35409012 PMCID: PMC8998297 DOI: 10.3390/ijms23073652] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 03/18/2022] [Accepted: 03/23/2022] [Indexed: 01/27/2023] Open
Abstract
Recent mouse model experiments support an instrumental role for senescent cells in age-related diseases and senescent cells may be causal to certain age-related pathologies. A strongly supported hypothesis is that extranuclear chromatin is recognized by the cyclic GMP–AMP synthase-stimulator of interferon genes pathway, which in turn leads to the induction of several inflammatory cytokines as part of the senescence-associated secretory phenotype. This sterile inflammation increases with chronological age and age-associated disease. More recently, several intracellular and extracellular metabolic changes have been described in senescent cells but it is not clear whether any of them have functional significance. In this review, we highlight the potential effect of dietary and age-related metabolites in the modulation of the senescent phenotype in addition to discussing how experimental conditions may influence senescent cell metabolism, especially that of energy regulation. Finally, as extracellular citrate accumulates following certain types of senescence, we focus on the recently reported role of extracellular citrate in aging and age-related pathologies. We propose that citrate may be an active component of the senescence-associated secretory phenotype and via its intake through the diet may even contribute to the cause of age-related disease.
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10
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Montoya B, Tóth Z, Lendvai ÁZ, Stier A, Criscuolo F, Zahn S, Bize P. Does IGF-1 Shape Life-History Trade-Offs? Opposite Associations of IGF-1 With Telomere Length and Body Size in a Free-Living Bird. Front Ecol Evol 2022. [DOI: 10.3389/fevo.2022.853674] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Hormonal pathways have been proposed to be key at modulating how fast individuals grow and reproduce and how long they live (i.e., life history trajectory). Research in model species living under controlled environment is suggesting that insulin-like growth factor 1 (IGF-1), which is an evolutionarily conserved polypeptide hormone, has an important role in modulating animal life histories. Much remains, however, to be done to test the role played by IGF-1 in shaping the phenotype and life history of animals in the wild. Using a wild long-lived bird, the Alpine swift (Tachymarptis melba), we show that adults with higher levels of IGF-1 had longer wings and shorter telomeres. Hence, telomeres being a proxy of lifespan in this species, our results support a potential role of IGF-1 at shaping the life-history of wild birds and suggest that IGF-1 may influence the growth-lifespan trade-off.
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11
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Hong X, Wang L, Zhang K, Liu J, Liu JP. Molecular Mechanisms of Alveolar Epithelial Stem Cell Senescence and Senescence-Associated Differentiation Disorders in Pulmonary Fibrosis. Cells 2022; 11:cells11050877. [PMID: 35269498 PMCID: PMC8909789 DOI: 10.3390/cells11050877] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 03/01/2022] [Accepted: 03/02/2022] [Indexed: 02/04/2023] Open
Abstract
Pulmonary senescence is accelerated by unresolved DNA damage response, underpinning susceptibility to pulmonary fibrosis. Recently it was reported that the SARS-Cov-2 viral infection induces acute pulmonary epithelial senescence followed by fibrosis, although the mechanism remains unclear. Here, we examine roles of alveolar epithelial stem cell senescence and senescence-associated differentiation disorders in pulmonary fibrosis, exploring the mechanisms mediating and preventing pulmonary fibrogenic crisis. Notably, the TGF-β signalling pathway mediates alveolar epithelial stem cell senescence by mechanisms involving suppression of the telomerase reverse transcriptase gene in pulmonary fibrosis. Alternatively, telomere uncapping caused by stress-induced telomeric shelterin protein TPP1 degradation mediates DNA damage response, pulmonary senescence and fibrosis. However, targeted intervention of cellular senescence disrupts pulmonary remodelling and fibrosis by clearing senescent cells using senolytics or preventing senescence using telomere dysfunction inhibitor (TELODIN). Studies indicate that the development of senescence-associated differentiation disorders is reprogrammable and reversible by inhibiting stem cell replicative senescence in pulmonary fibrosis, providing a framework for targeted intervention of the molecular mechanisms of alveolar stem cell senescence and pulmonary fibrosis. Abbreviations: DPS, developmental programmed senescence; IPF, idiopathic pulmonary fibrosis; OIS, oncogene-induced replicative senescence; SADD, senescence-associated differentiation disorder; SALI, senescence-associated low-grade inflammation; SIPS, stress-induced premature senescence; TERC, telomerase RNA component; TERT, telomerase reverse transcriptase; TIFs, telomere dysfunction-induced foci; TIS, therapy-induced senescence; VIS, virus-induced senescence.
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Affiliation(s)
- Xiaojing Hong
- Institute of Ageing Research, Hangzhou Normal University School of Medicine, Hangzhou 311121, China; (X.H.); (L.W.); (K.Z.); (J.L.)
| | - Lihui Wang
- Institute of Ageing Research, Hangzhou Normal University School of Medicine, Hangzhou 311121, China; (X.H.); (L.W.); (K.Z.); (J.L.)
| | - Kexiong Zhang
- Institute of Ageing Research, Hangzhou Normal University School of Medicine, Hangzhou 311121, China; (X.H.); (L.W.); (K.Z.); (J.L.)
| | - Jun Liu
- Institute of Ageing Research, Hangzhou Normal University School of Medicine, Hangzhou 311121, China; (X.H.); (L.W.); (K.Z.); (J.L.)
| | - Jun-Ping Liu
- Institute of Ageing Research, Hangzhou Normal University School of Medicine, Hangzhou 311121, China; (X.H.); (L.W.); (K.Z.); (J.L.)
- Department of Immunology and Pathology, Monash University Faculty of Medicine, Prahran, VIC 3181, Australia
- Hudson Institute of Medical Research, Monash University Department of Molecular and Translational Science, Clayton, VIC 3168, Australia
- Correspondence:
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12
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Penrice DD, Havlichek D, Kamath PS, Simonetto DA. Outcomes following liver transplant in adults with telomere biology disorders. J Hepatol 2022; 76:214-216. [PMID: 34331967 DOI: 10.1016/j.jhep.2021.07.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 06/25/2021] [Accepted: 07/21/2021] [Indexed: 12/04/2022]
Affiliation(s)
- Daniel D Penrice
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, United States
| | - Daniel Havlichek
- Department of Internal Medicine, Mayo Clinic, Rochester, MN, United States
| | - Patrick S Kamath
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, United States
| | - Douglas A Simonetto
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, United States.
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Sellami M, Bragazzi N, Prince MS, Denham J, Elrayess M. Regular, Intense Exercise Training as a Healthy Aging Lifestyle Strategy: Preventing DNA Damage, Telomere Shortening and Adverse DNA Methylation Changes Over a Lifetime. Front Genet 2021; 12:652497. [PMID: 34421981 PMCID: PMC8379006 DOI: 10.3389/fgene.2021.652497] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Accepted: 04/30/2021] [Indexed: 12/13/2022] Open
Abstract
Exercise training is one of the few therapeutic interventions that improves health span by delaying the onset of age-related diseases and preventing early death. The length of telomeres, the 5'-TTAGGG n -3' tandem repeats at the ends of mammalian chromosomes, is one of the main indicators of biological age. Telomeres undergo shortening with each cellular division. This subsequently leads to alterations in the expression of several genes that encode vital proteins with critical functions in many tissues throughout the body, and ultimately impacts cardiovascular, immune and muscle physiology. The sub-telomeric DNA is comprised of heavily methylated, heterochromatin. Methylation and histone acetylation are two of the most well-studied examples of the epigenetic modifications that occur on histone proteins. DNA methylation is the type of epigenetic modification that alters gene expression without modifying gene sequence. Although diet, genetic predisposition and a healthy lifestyle seem to alter DNA methylation and telomere length (TL), recent evidence suggests that training status or physical fitness are some of the major factors that control DNA structural modifications. In fact, TL is positively associated with cardiorespiratory fitness, physical activity level (sedentary, active, moderately trained, or elite) and training intensity, but is shorter in over-trained athletes. Similarly, somatic cells are vulnerable to exercise-induced epigenetic modification, including DNA methylation. Exercise-training load, however, depends on intensity and volume (duration and frequency). Training load-dependent responses in genomic profiles could underpin the discordant physiological and physical responses to exercise. In the current review, we will discuss the role of various forms of exercise training in the regulation of DNA damage, TL and DNA methylation status in humans, to provide an update on the influence exercise training has on biological aging.
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Affiliation(s)
- Maha Sellami
- Physical Education Department (PE), College of Education (CEdu), Qatar University, Doha, Qatar
| | - Nicola Bragazzi
- Department of Health Sciences (DISSAL), Postgraduate School of Public Health, University of Genoa, Genoa, Italy
| | - Mohammad Shoaib Prince
- Physical Education Department (PE), College of Education (CEdu), Qatar University, Doha, Qatar
- Division of Sports and Wellness, Department of Students Affairs, College of North Atlantic Qatar (CNAQ), Doha, Qatar
| | - Joshua Denham
- School of Health and Biomedical Sciences, RMIT University, Melbourne, VIC, Australia
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14
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Telomeres in Interstitial Lung Disease. J Clin Med 2021; 10:jcm10071384. [PMID: 33808277 PMCID: PMC8037770 DOI: 10.3390/jcm10071384] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 03/18/2021] [Accepted: 03/23/2021] [Indexed: 01/15/2023] Open
Abstract
Interstitial lung diseases (ILD) encompass a group of conditions involving fibrosis and/or inflammation of the pulmonary parenchyma. Telomeres are repetitive DNA sequences at chromosome ends which protect against genome instability. At each cell division, telomeres shorten, but the telomerase complex partially counteracts progressive loss of telomeres by catalysing the synthesis of telomeric repeats. Once critical telomere shortening is reached, cell cycle arrest or apoptosis are triggered. Telomeres progressively shorten with age. A number of rare genetic mutations have been identified in genes encoding for components of the telomerase complex, including telomerase reverse transcriptase (TERT) and telomerase RNA component (TERC), in familial and, less frequently, in sporadic fibrotic ILDs. Defects in telomerase result in extremely short telomeres. More rapidly progressive disease is observed in fibrotic ILD patients with telomere gene mutations, regardless of underlying diagnosis. Associations with common single nucleotide polymorphisms in telomere related genes have also been demonstrated for various ILDs. Shorter peripheral blood telomere lengths compared to age-matched healthy individuals are found in a proportion of patients with fibrotic ILDs, and in idiopathic pulmonary fibrosis (IPF) and fibrotic hypersensitivity pneumonitis (HP) have been linked to worse survival, independently of disease severity. Greater susceptibility to immunosuppressant-induced side effects in patients with short telomeres has been described in patients with IPF and with fibrotic HP. Here, we discuss recent evidence for the involvement of telomere length and genetic variations in the development, progression, and treatment of fibrotic ILDs.
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Abstract
Short telomere syndrome is a genetically inherited syndrome resulting in premature telomere shortening. This premature shortening of telomeres can result in hematologic, pulmonary, vascular, gastrointestinal, and hepatic manifestations of disease. Identifying patients with short telomere syndrome can be a clinical challenge due to the multitude of potential manifestations and lack of widely available diagnostic tests. In this review, we will highlight hepatic manifestations of short telomere syndrome with a focus on diagnosis, testing, and potential treatments.
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Affiliation(s)
- Daniel D Penrice
- Department of Internal Medicine, Mayo Clinic Rochester, Rochester, Minnesota
| | - Douglas A Simonetto
- Division of Gastroenterology and Hepatology, Mayo Clinic Rochester, Rochester, Minnesota
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16
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Fang C, Huang H, Zhang Q, Wang N, Jing X, Guo J, Ferianc M, Xu Z. Relation between sex hormones and leucocyte telomere length in men with idiopathic pulmonary fibrosis. Respirology 2020; 25:1265-1273. [PMID: 32583532 PMCID: PMC7754418 DOI: 10.1111/resp.13871] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 04/01/2020] [Accepted: 04/16/2020] [Indexed: 12/30/2022]
Abstract
Background and objective IPF is an ageing‐related lung disorder featuring progressive lung scarring. IPF patients are frequently identified with short telomeres but coding mutations in telomerase can only explain a minority of cases. Sex hormones regulate telomerase activity in vitro and levels of sex hormones are related to LTL. The objective of this study was to explore whether sex hormones were associated with LTL, whether they interacted with genetic variants in telomerase and whether polymorphisms in the exon of androgen metabolism genes were associated with plasma testosterone concentrations in male IPF patients. Methods A case–control study was performed on 101 male IPF subjects and 51 age‐matched healthy controls. Early morning plasma sex hormones were quantified, and whole‐exome sequencing was used to identify rare protein‐altering variants of telomerase and SNP in the exon of androgen metabolism genes. LTL was analysed by PCR and expressed as a T/S ratio. Results LTL, testosterone and DHT were decreased significantly in the IPF group. After adjustments for age and variant status in telomerase‐related genes, only testosterone was positively associated with LTL (P = 0.001). No significant interaction (P = 0.661) was observed between rare protein‐altering variants of telomerase and testosterone. No coding SNP in androgen metabolism genes were significantly associated with testosterone concentrations. Conclusion Plasma testosterone is associated with LTL independent of age or rare protein‐altering variants of telomerase. No genetic variations of androgen‐related pathway genes are associated with androgen concentrations. Further studies are warranted to examine whether hormonal interventions might retard telomere loss in male IPF patients.
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Affiliation(s)
- Chuling Fang
- Department of Respiratory and Critical Medicine, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Hui Huang
- Department of Respiratory and Critical Medicine, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Qian Zhang
- Department of Respiratory and Critical Medicine, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Na Wang
- Department of Respiratory and Critical Medicine, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Xiaoyan Jing
- Department of Respiratory and Critical Medicine, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Jian Guo
- Department of Respiratory and Critical Medicine, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Martin Ferianc
- Electronic and Electrical Engineering Department, University College London, London, UK
| | - Zuojun Xu
- Department of Respiratory and Critical Medicine, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
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Bilgili H, Białas AJ, Górski P, Piotrowski WJ. Telomere Abnormalities in the Pathobiology of Idiopathic Pulmonary Fibrosis. J Clin Med 2019; 8:jcm8081232. [PMID: 31426295 PMCID: PMC6723768 DOI: 10.3390/jcm8081232] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Revised: 08/12/2019] [Accepted: 08/13/2019] [Indexed: 12/14/2022] Open
Abstract
Idiopathic pulmonary fibrosis (IPF) occurs primarily in older adults and the incidence is clearly associated with aging. This disease seems to be associated with several hallmarks of aging, including telomere attrition and cellular senescence. Increasing evidence suggests that abnormalities involving telomeres and their proteome play a significant role in the pathobiology of IPF. The aim of this study is to summarize present knowledge in the field, as well as to discuss its possible clinical implications. Numerous mutations in genes associated with telomere functioning were studied in the context of IPF, mainly for Telomerase Reverse Transcriptase (TERT) and Telomerase RNA Component (TERC). Such mutations may lead to telomere shortening, which seems to increase the risk of IPF, negatively influence disease progression, and contribute to worse prognosis after lung transplantation. Some evidence indicates the possibility for the use of telomerase activators as potential therapeutic agents in pulmonary fibrosis. To sum up, increasing evidence suggests the role of telomere abnormalities in the pathobiology of IPF, natural history and prognosis of the disease. There are also possibilities for telomerase targeting in the potential development of new treatment agents. However, all these aspects require further research.
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Affiliation(s)
- Hasancan Bilgili
- Department of Pneumology and Allergy, Medical University of Lodz, 90-154 Lodz, Poland
| | - Adam J Białas
- Department of Pneumology and Allergy, Medical University of Lodz, 90-154 Lodz, Poland.
| | - Paweł Górski
- Department of Pneumology and Allergy, Medical University of Lodz, 90-154 Lodz, Poland
| | - Wojciech J Piotrowski
- Department of Pneumology and Allergy, Medical University of Lodz, 90-154 Lodz, Poland
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18
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Abstract
Telomeres are specialised structures at the end of linear chromosomes. They consist of tandem repeats of the hexanucleotide sequence TTAGGG, as well as a protein complex called shelterin. Together, they form a protective loop structure against chromosome fusion and degradation. Shortening or damage to telomeres and opening of the loop induce an uncapped state that triggers a DNA damage response resulting in senescence or apoptosis.Average telomere length, usually measured in human blood lymphocytes, was thought to be a biomarker for ageing, survival and mortality. However, it becomes obvious that regulation of telomere length is very complex and involves multiple processes. For example, the "end replication problem" during DNA replication as well as oxidative stress are responsible for the shortening of telomeres. In contrast, telomerase activity can potentially counteract telomere shortening when it is able to access and interact with telomeres. However, while highly active during development and in cancer cells, the enzyme is down-regulated in most human somatic cells with a few exceptions such as human lymphocytes. In addition, telomeres can be transcribed, and the transcription products called TERRA are involved in telomere length regulation.Thus, telomere length and their integrity are regulated at many different levels, and we only start to understand this process under conditions of increased oxidative stress, inflammation and during diseases as well as the ageing process.This chapter aims to describe our current state of knowledge on telomeres and telomerase and their regulation in order to better understand their role for the ageing process.
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Derenzini E, Risso A, Ruella M, Spatola T, Milone G, Pioltelli P, Iori AP, Santarone S, Bosi A, Rambaldi A, Bacigalupo AP, Arcese W, Tarella C. Influence of Donor and Recipient Gender on Telomere Maintenance after Umbilical Cord Blood Cell Transplantation: A Study by the Gruppo Italiano Trapianto Di Midollo Osseo. Biol Blood Marrow Transplant 2019; 25:1387-1394. [PMID: 30935966 DOI: 10.1016/j.bbmt.2019.03.026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2018] [Accepted: 03/24/2019] [Indexed: 12/13/2022]
Abstract
Physiologic loss of telomerase activity in adult life determines progressive telomere length (TL) shortening. Inflammation and oxidative damage are established causes of TL loss; moreover, males have shorter telomeres compared with females. Despite these notions, mechanisms regulating TL maintenance are poorly defined. Because umbilical cord blood (UCB) cells harbor very long telomeres, not yet exposed to environmental damages, UCB transplantation (UCBT) provides a unique experimental setting to study determinants of TL in humans. TL dynamics were analyzed on peripheral blood mononuclear cells (MNCs) from 36 patients (median age, 42 years) undergoing UCBT. TL was studied at a median of 20 months after UCBT. A significantly longer TL (mean, 8698 bp; range, 6521 to 11,960) was documented in UCBT recipients compared with age-matched healthy control subjects (mean, 7396 bp; range, 4375 to 11,108; P < .01). Among variables potentially influencing TL maintenance, including recipient features, graft type, transplant procedure, and engraftment kinetics, only donor-recipient gender combination was associated with TL, with the longest TL in women receiving male UCB (mean, 10,063 bp; range, 8381 to 11,960). To further investigate this trend, telomerase activation was assessed in vitro. Experiments showed that telomerase subunits were preferentially upregulated in male-derived bone marrow MNCs exposed ex vivo to estradiol as compared with female MNCs. This implies an increased sensitivity of male-derived MNCs to telomerase activation induced by estradiol. The results suggest that extrinsic and modifiable factors such as hormonal status and female milieu could be major determinants of TL in humans, providing the rationale for investigating hormonal-based approaches to counteract telomere erosion and aging-related diseases.
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Affiliation(s)
- Enrico Derenzini
- Oncohematology Division, IEO European Institute of Oncology, IRCCS, Milan, Italy
| | - Alessandra Risso
- Molecular Biotechnology Center Hematology & Cell Therapy Unit at Mauriziano H., Torino, Italy
| | - Marco Ruella
- Center for Cellular Immunotherapies & Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania
| | - Tiziana Spatola
- Molecular Biotechnology Center Hematology & Cell Therapy Unit at Mauriziano H., Torino, Italy
| | - Giuseppe Milone
- Hematology and BMT Unit, Ospedale Ferrarotto, Catania, Italy
| | | | - Anna Paola Iori
- Division of Hematology, Department of Cellular Biotech & Hematol, 'Sapienza' University, Rome, Italy
| | - Stella Santarone
- Bone Marrow Transplant Center, Spirito Santo Hospital, Pescara, Italy
| | - Alberto Bosi
- Hematology Department, University of Florence and AOU Careggi, Florence, Italy
| | - Alessandro Rambaldi
- Department of Oncology and Hematology, ASST Papa Giovanni XXIII, Bergamo, Italy; University of Milan, Milan, Italy
| | | | - William Arcese
- Hematology Division-Stem Cell Transplant Unit, University of Rome Tor Vergata, Rome, Italy
| | - Corrado Tarella
- Oncohematology Division, IEO European Institute of Oncology, IRCCS, Milan, Italy; University of Milan, Milan, Italy.
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Network cultivation, diurnal cortisol and biological ageing: The rejuvenation hypothesis. Med Hypotheses 2019; 122:1-4. [DOI: 10.1016/j.mehy.2018.09.041] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 09/15/2018] [Accepted: 09/27/2018] [Indexed: 11/20/2022]
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Patnaik MM, Kamath PS, Simonetto DA. Hepatic manifestations of telomere biology disorders. J Hepatol 2018; 69:736-743. [PMID: 29758336 DOI: 10.1016/j.jhep.2018.05.006] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Revised: 04/23/2018] [Accepted: 05/03/2018] [Indexed: 12/13/2022]
Abstract
A 51-year-old Caucasian male was referred for evaluation of variceal bleeding. Laboratory tests were remarkable for mild thrombocytopenia and moderate alkaline phosphatase elevation. Synthetic liver function was well preserved. Abdominal computed tomography scan revealed moderate splenomegaly, gastric varices, and normal hepatic contour. A transjugular liver biopsy was performed revealing findings of nodular regenerative hyperplasia with no significant fibrosis or necroinflammatory activity. Hepatic venous pressure gradient was elevated at 31 mmHg, consistent with clinically significant portal hypertension. The clinical course was complicated by refractory gastric variceal bleeding requiring a surgical portosystemic shunt. Approximately seven years after the initial presentation, the patient developed progressive dyspnoea and a diagnosis of idiopathic pulmonary fibrosis was made. Contrast-enhanced echocardiogram was not suggestive of hepatopulmonary syndrome or portopulmonary hypertension. Given this new diagnosis a telomere biology disorder was suspected. A flow-fluorescence in situ hybridisation analysis for telomere length assessment revealed telomere lengths below the first percentile in both lymphocytes and granulocytes. Next generation sequencing analysis identified a heterozygous mutation involving the hTERT gene (Histidine983Threonine). The lung disease unfortunately progressed in the subsequent two years, leading to the patient's death nine years after his initial presentation with portal hypertension. During those nine years two brothers also developed idiopathic pulmonary fibrosis. The questions that arise from this case include.
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Affiliation(s)
| | - Patrick S Kamath
- Mayo Clinic Division of Gastroenterology and Hepatology, Rochester, MN, USA
| | - Douglas A Simonetto
- Mayo Clinic Division of Gastroenterology and Hepatology, Rochester, MN, USA.
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Athanasoulia-Kaspar AP, Auer MK, Stalla GK, Jakovcevski M. Shorter telomeres associated with high doses of glucocorticoids: the link to increased mortality? Endocr Connect 2018; 7:/journals/ec/aop/ec-18-0362.xml. [PMID: 30352410 PMCID: PMC6215799 DOI: 10.1530/ec-18-0362] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Accepted: 08/30/2018] [Indexed: 12/22/2022]
Abstract
OBJECTIVE Patients with non-functioning pituitary adenomas exhibit high morbidity and mortality rates. Growth hormone deficiency and high doses of glucocorticoid substitution therapy have been identified as corresponding risk factors. Interestingly, high levels of endogenous cortisol in, e.g., patients with post-traumatic stress disorder or patients with Cushing's disease have been linked to shorter telomere length. Telomeres are noncoding DNA regions located at the end of chromosomes consisting of repetitive DNA sequences which shorten with ageing and hereby determine cell survival. Therefore, telomere length can serve as a predictor for the onset of disease and mortality in some endocrine disorders (e.g., Cushing's disease). DESIGN/METHODS We examine telomere length from blood in patients (n = 115) with non-functioning pituitary adenomas (NFPA) in a cross-sectional case control (n = 106, age-, gender- matched) study using qPCR. Linear regression models were used to identify independent predictors of telomere length. RESULTS We show that patients with NFPA exhibited shorter telomeres than controls. No significant association of indices of growth hormone deficiency (IGF-1-level-SDS, years of unsubstituted growth hormone deficiency etc.) with telomere length was detected. Interestingly, linear regression analysis showed that hydrocortisone replacement dosage in patients with adrenal insufficiency (n = 52) was a significant predictor for shorter telomere length (β = 0.377; p = 0.018) independent of potential confounders. Median split analysis revealed that higher hydrocortisone intake (> 20 mg) was associated with significantly shorter telomeres. CONCLUSION These observations strengthen the importance of adjusted glucocorticoid treatment in NFPA patients with respect to morbidity and mortality rates.
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Affiliation(s)
| | - Matthias K Auer
- Clinical NeuroendocrinologyMax Planck Institute of Psychiatry, Munich, Germany
- Medizinische Klinik und Poliklinik IVKlinikum der Universität München, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Günter K Stalla
- Clinical NeuroendocrinologyMax Planck Institute of Psychiatry, Munich, Germany
| | - Mira Jakovcevski
- Department of Stress Neurobiology and NeurogeneticsMax Planck Institute of Psychiatry, Munich, Germany
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Mangaonkar AA, Patnaik MM. Short Telomere Syndromes in Clinical Practice: Bridging Bench and Bedside. Mayo Clin Proc 2018; 93:904-916. [PMID: 29804726 PMCID: PMC6035054 DOI: 10.1016/j.mayocp.2018.03.020] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Accepted: 03/19/2018] [Indexed: 10/16/2022]
Abstract
Short telomere syndromes (STSs) are accelerated aging syndromes often caused by inheritable gene mutations resulting in decreased telomere lengths. Consequently, organ systems with increased cell turnover, such as the skin, bone marrow, lungs, and gastrointestinal tract, are commonly affected. Owing to diverse clinical presentations, STSs pose a diagnostic challenge, with bone marrow failure and idiopathic pulmonary fibrosis being frequent manifestations, occurring in association with gene mutations involving DKC1 (for expansion of gene symbols, use search tool at www.genenames.org), TERT, TERC, and others. Inherited STSs demonstrate genetic anticipation, occurring at an earlier age with more severe manifestations in the affected progeny. Telomere lengths can be assessed in peripheral blood granulocytes and lymphocytes using a sensitive technique called flow cytometry-fluorescence in situ hybridization, and mutational analysis can be performed using next-generation sequencing assays. In approximately 40% of patients with shortened telomere lengths, gene mutations cannot be identified due to the fact that all STS-associated genes have not yet been defined or due to alternative mechanisms of telomere shortening. Danazol, an anabolic steroid, has been associated with hematologic responses in patients with STSs and associated bone marrow failure; however, its reported ability to increase telomerase activity and reduce telomere attrition needs further elucidation. Organ transplant is reserved for patients with end-organ failure and is associated with substantial morbidity and mortality. Herein, we summarize the clinical and laboratory characteristics of STSs and offer a stepwise approach to diagnose and manage complications in affected patients.
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Affiliation(s)
| | - Mrinal M Patnaik
- Division of Hematology, Department of Medicine, Mayo Clinic, Rochester, MN.
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Song Y, Cho M, Brennan KM, Chen BH, Song Y, Manson JE, Hevener AL, You NCY, Butch AW, Liu S. Relationships of sex hormone levels with leukocyte telomere length in Black, Hispanic, and Asian/Pacific Islander postmenopausal women. J Diabetes 2018; 10:502-511. [PMID: 28609023 PMCID: PMC6499547 DOI: 10.1111/1753-0407.12577] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Revised: 05/15/2017] [Accepted: 06/07/2017] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Sex hormones may play important roles in sex-specific biological aging. In the study, we specifically examined associations between circulating sex hormone concentrations and leukocyte telomere length (TL). METHODS A cross-sectional study was conducted among 1124 Black, 444 Hispanic, and 289 Asian/Pacific Islander women in the Women's Health Initiative Observational Cohort. Estradiol and testosterone concentrations were measured using electrochemiluminescence immunoassays; TL was measured using quantitative polymerase chain reaction. RESULTS Women in the study were aged 50-79 years. Estradiol concentrations were not significantly associated with TL in this sample. The associations between total and free testosterone and TL differed by race/ethnicity (Pinteraction = 0.03 and 0.05 for total and free testosterone, respectively). Total and free testosterone concentrations were not associated with TL in Black and Hispanic women, whereas in Asian/Pacific Islander women their concentrations were inversely associated with TL (Ptrend = 0.003 for both). These associations appeared robust in multiple subgroup analyses and multivariable models adjusted for potential confounding factors. In Asian/Pacific Islander women, a doubling of serum free and total testosterone concentrations was associated with a 202-bp shorter TL (95% confidence interval [CI] 51-353 bp) and 203-bp shorter TL (95% CI 50-355 bp), respectively. CONCLUSIONS Serum estradiol concentrations were not associated with leukocyte TL in this large sample of postmenopausal women. Total and free testosterone concentrations were inversely associated with TL in Asian/Pacific Islander women, but not in Black and Hispanic women, although future studies to replicate our observations are warranted particularly to address potential ethnicity-specific relationships.
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Affiliation(s)
- Yan Song
- Department of Epidemiology, Fielding School of Public Health, University of California, Los Angeles, California, USA
- Department of Epidemiology, School of Public Health, Brown University, Providence, Rhode Island, USA
| | - Michele Cho
- Department of Gynecology and Obstetrics, University of California, Los Angeles, California, USA
| | - Kathleen M Brennan
- Department of Gynecology and Obstetrics, University of California, Los Angeles, California, USA
| | - Brian H Chen
- Department of Epidemiology, Fielding School of Public Health, University of California, Los Angeles, California, USA
| | - Yiqing Song
- Department of Epidemiology, Richard M. Fairbanks School of Public Health, Indiana University, Indianapolis, Indiana, USA
| | - JoAnn E Manson
- Division of Preventive Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
- Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
| | - Andrea L Hevener
- Division of Endocrinology, Diabetes and Hypertension, University of California, Los Angeles, California, USA
| | - Nai-Chieh Y You
- Department of Epidemiology, Fielding School of Public Health, University of California, Los Angeles, California, USA
| | - Anthony W Butch
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, University of California, Los Angeles, California, USA
| | - Simin Liu
- Department of Epidemiology, School of Public Health, Brown University, Providence, Rhode Island, USA
- Department of Medicine, Alpert Medical School, Brown University, Providence, Rhode Island, USA
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Abstract
PURPOSE OF REVIEW Telomere attrition and dysfunction has become a well established pathway involved in organismal aging, not only because it imposes a limitation to cell division and therefore, tissue regeneration but also because telomere homeostasis influences other pathways involved in aging. However, the implication of telomere biology in ovarian aging and fertility is barely starting to be unveiled. RECENT FINDINGS During the last years, mounting evidence in favor of the relationship between the accumulation of short telomeres and ovarian senescence has emerged. Telomere attrition and the loss of telomerase activity in ovarian cell types is a common characteristic of female infertility. SUMMARY Recent findings regarding telomere attrition in the ovary open the possibility of both, finding new molecular biomarkers related to telomere homeostasis that make possible the early detection of ovarian dysfunction before the ovarian reserve has vanished, and the search of new therapies to preserve or set up ovarian cell types so that new and better quality oocytes can be generated in aged ovaries to improve IVF outcomes.
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26
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Lorenzi M, Bonassi S, Lorenzi T, Giovannini S, Bernabei R, Onder G. A review of telomere length in sarcopenia and frailty. Biogerontology 2018; 19:209-221. [PMID: 29549539 DOI: 10.1007/s10522-018-9749-5] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Accepted: 02/23/2018] [Indexed: 12/16/2022]
Abstract
Sarcopenia and frailty are associated with several important health-related adverse events, including disability, loss of independence, institutionalization and mortality. Sarcopenia can be considered a biological substrate of frailty, and the prevalence of both these conditions progressively increases with age. Telomeres are nucleoprotein structures located at the end of linear chromosomes and implicated in cellular ageing, shorten with age, and are associated with various age-related diseases. In addition, telomere length (TL) is widely considered a molecular/cellular hallmark of the ageing process. This narrative review summarizes the knowledge about telomeres and analyzes for the first time a possible association of TL with sarcopenia and frailty. The overview provided by the present review suggests that leukocyte TL as single measurement, calculated by quantitative real-time polymerase chain reaction (qRT-PCR), cannot be considered a meaningful biological marker for complex, multidimensional age-related conditions, such as sarcopenia and frailty. Panels of biomarkers, including TL, may provide more accurate assessment and prediction of outcomes in these geriatric syndromes in elderly people.
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Affiliation(s)
- Maria Lorenzi
- Laboratory of Biogerontology, Department of Geriatrics, Neurosciences and Orthopedics, A. Gemelli Foundation, Catholic University of the Sacred Heart, School of Medicine, L.go F. Vito 1, 00168, Rome, Italy.
| | - Stefano Bonassi
- Unit of Clinical and Molecular Epidemiology, IRCCS San Raffaele Pisana, Via di Val Cannuta 247, 00166, Rome, Italy
| | - Teresa Lorenzi
- Department of Experimental and Clinical Medicine, Section of Neuroscience and Cell Biology, School of Medicine, Università Politecnica delle Marche, Via Tronto 10/A, 60020, Ancona, Italy
| | - Silvia Giovannini
- Laboratory of Biogerontology, Department of Geriatrics, Neurosciences and Orthopedics, A. Gemelli Foundation, Catholic University of the Sacred Heart, School of Medicine, L.go F. Vito 1, 00168, Rome, Italy
| | - Roberto Bernabei
- Department of Geriatrics, Neurosciences and Orthopedics, A. Gemelli Foundation, Catholic University of the Sacred Heart, School of Medicine, L.go F. Vito 1, 00168, Rome, Italy
| | - Graziano Onder
- Department of Geriatrics, Neurosciences and Orthopedics, A. Gemelli Foundation, Catholic University of the Sacred Heart, School of Medicine, L.go F. Vito 1, 00168, Rome, Italy
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Zhou J, Wang J, Shen Y, Yang Y, Huang P, Chen S, Zou C, Dong B. The association between telomere length and frailty: A systematic review and meta-analysis. Exp Gerontol 2018. [PMID: 29518479 DOI: 10.1016/j.exger.2018.02.030] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
BACKGROUND Several studies have examined the association between telomere length and frailty, but results from these studies are contradictory. Therefore, we conducted a systematic review and meta-analysis to examine the association between telomere length and frailty. METHODS We searched the literature in Ovid (MEDLINE), Embase, PubMed, Web of Knowledge and Cochrane databases in July 2017 for studies evaluating the association of telomere length and the risk of frailty. RESULTS A total of 5 studies (3268 participants) were eligible in our study. The prevalence of frailty ranged from 5.4% to 51.1%. The pooled mean difference of telomere length for the non-frail versus frail was 0.06 (95% CI: -0.01, 0.13), suggesting that no significant association was found between telomere length and frailty. In addition, the subgroup analysis indicated that telomere length was not significantly associated with the risk of frailty in all gender groups. Similar results were also found when frailty was defined by the Fried criteria (mean difference = 0.07, 95% CI: -0.03, 0.16) and frailty index (mean difference = -0.02, 95% CI: -0.05, 0.01), but not by the frailty scale (mean difference = 0.18, 95% CI: 0.04, 0.32). CONCLUSION Telomere length is not associated with the risk of frailty. Well-designed prospective studies are needed to evaluate further whether telomere length is a meaningful biological marker for frailty.
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Affiliation(s)
- Jianghua Zhou
- Geriatrics Department, Chengdu Fifth People's Hospital, Chengdu, China; Chengdu-Montpellier Geriatric Research Center, China
| | - Jiang Wang
- Department of medicine, Jinggangshan University, Ji'an, China
| | | | - Ying Yang
- Geriatrics Department, Chengdu Fifth People's Hospital, Chengdu, China; Chengdu-Montpellier Geriatric Research Center, China
| | - Pan Huang
- West China Hospital, Sichuan University, China
| | - Shanping Chen
- Geriatrics Department, Chengdu Fifth People's Hospital, Chengdu, China; Chengdu-Montpellier Geriatric Research Center, China
| | - Chuan Zou
- Geriatrics Department, Chengdu Fifth People's Hospital, Chengdu, China; Chengdu-Montpellier Geriatric Research Center, China
| | - Birong Dong
- The Center of Gerontology and Geriatrics, West China Hospital, Sichuan University, China; Collaborative Innovation Center of Sichuan for Elderly Care and Health, Chengdu, China.
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Foroughi S, Ziamajidi N, Javid S, Abbasalipourkabir R, Aflatoonian R, Ashrafi M, Nourian A. Study of telomerase reverse transcriptase and uterine-ovarian-specific genes expression in the endometrial tissue of ovariectomized female Sprague-Dawley rats. Int J Biol Macromol 2018; 113:1302-1307. [PMID: 29471091 DOI: 10.1016/j.ijbiomac.2018.02.115] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2017] [Revised: 01/30/2018] [Accepted: 02/16/2018] [Indexed: 11/15/2022]
Abstract
BACKGROUND An in vivo study was carried out to study of telomerase reverse transcriptase and Uterine-Ovarian-specific genes expression in the endometrial tissue of ovariectomized female Sprague-Dawley rats. MATERIAL AND METHODS Twenty-four female Sprague-Dawley rats divided into 4 groups of six rats. The first and second groups were ovariectomized and given tamoxifen and tamoxifen-loaded SLN respectively for six days continuously. Group 3 served as the untreated ovariectomized control group and group 4 was made up of untreated normal healthy rats. At the end of the study, the rats were sacrificed and study of the genes expression and serum zinc and copper were carried out. RESULTS The results showed that the expression of TERT in the group treated with tamoxifen, and tamoxifen-loaded solid lipid nanoparticles, significantly decreased (p<0.001) compared with ovariectomized control group. The results also revealed that the treatment with tamoxifen-loaded solid lipid nanoparticles increased expression of UO-44 gene compared to ovariectomized control group, while there was no difference between tamoxifen treated and control group. CONCLUSIONS Encapsulation of tamoxifen in solid lipid nanoparticles increased its targeting efficiency and improved the impact of the drug on the serum levels of some trace elements.
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Affiliation(s)
| | | | - Saman Javid
- Hamadan University of Medical Sciences, Hamadan, Iran
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29
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Sack MN, Fyhrquist FY, Saijonmaa OJ, Fuster V, Kovacic JC. Basic Biology of Oxidative Stress and the Cardiovascular System: Part 1 of a 3-Part Series. J Am Coll Cardiol 2017; 70:196-211. [PMID: 28683968 DOI: 10.1016/j.jacc.2017.05.034] [Citation(s) in RCA: 144] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Revised: 04/24/2017] [Accepted: 05/10/2017] [Indexed: 01/18/2023]
Abstract
The generation of reactive oxygen species (ROS) is a fundamental aspect of normal human biology. However, when ROS generation exceeds endogenous antioxidant capacity, oxidative stress arises. If unchecked, ROS production and oxidative stress mediate tissue and cell damage that can spiral in a cycle of inflammation and more oxidative stress. This article is part 1 of a 3-part series covering the role of oxidative stress in cardiovascular disease. The broad theme of this first paper is the mechanisms and biology of oxidative stress. Specifically, the authors review the basic biology of oxidative stress, relevant aspects of mitochondrial function, and stress-related cell death pathways (apoptosis and necrosis) as they relate to the heart and cardiovascular system. They then explore telomere biology and cell senescence. As important regulators and sensors of oxidative stress, telomeres are segments of repetitive nucleotide sequence at each end of a chromosome that protect the chromosome ends from deterioration.
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Affiliation(s)
- Michael N Sack
- Cardiovascular and Pulmonary Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland.
| | | | | | - Valentin Fuster
- Zena and Michael A. Wiener Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, New York, New York; Marie-Josée and Henry R. Kravis Cardiovascular Health Center, Icahn School of Medicine at Mount Sinai, New York, New York; Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain
| | - Jason C Kovacic
- Zena and Michael A. Wiener Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, New York, New York.
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Scarabino D, Broggio E, Gambina G, Pelliccia F, Corbo RM. Common variants of human TERT and TERC genes and susceptibility to sporadic Alzheimers disease. Exp Gerontol 2016; 88:19-24. [PMID: 28039025 DOI: 10.1016/j.exger.2016.12.017] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Revised: 12/07/2016] [Accepted: 12/19/2016] [Indexed: 01/13/2023]
Abstract
Studies investigating telomere length in association with cognitive decline, dementia, and sporadic Alzheimer's disease (AD) have frequently found shorter telomeres to be associated with the development of AD and telomerase expression with pathological processes in AD. Human telomerase is constituted by two components: the telomerase reverse transcriptase (TERT) and the telomerase RNA component (TERC). Genetic variation at the two loci has been investigated in relation to telomere length, longevity, and common diseases of advanced age, but not in relation to AD. We examined three polymorphisms of the TERT gene (VNTR MNS16A, rs2853691, rs33954691) and three polymorphisms of the TERC gene (rs12696304, rs3772190, rs16847897) in a sample of 220 AD patients and 146 controls. MNS16A LL genotype was found to be associated with an increased risk of AD only in males [interaction term adjusted OR=3.55 (95% CI 1.2-10.2)]. The three TERC single nucleotide polymorphisms are in strict linkage disequilibrium and their genotype combinations influenced the age at AD onset (AAO). The combined genotype GG-TT-CC was associated with a mean AAO six years lower (70.5±6.7) than that associated with the other genotype combinations (76.04±6.7, p=0.01). The fact that the MNS16 L allele has been reported to lower TERT expression, and that the TERC alleles G, T, C (rs12696304, rs3772190, rs16847897 in this order have been repeatedly found associated with shorter LTL, seems to corroborate the hypothesis of a role of telomere length and telomerase in AD susceptibility.
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Affiliation(s)
- D Scarabino
- CNR Institute of Cellular Biology and Neurobiology, Monterotondo Scalo, Rome, Italy
| | - E Broggio
- Alzheimer's Disease Center, Department of Neuroscience, University and Hospital of Verona, Verona, Italy
| | - G Gambina
- Alzheimer's Disease Center, Department of Neuroscience, University and Hospital of Verona, Verona, Italy
| | - F Pelliccia
- Department of Biology and Biotechnology, La Sapienza University, Rome, Italy
| | - R M Corbo
- Department of Biology and Biotechnology, La Sapienza University, Rome, Italy.
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31
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Carnosine and the processes of ageing. Maturitas 2016; 93:28-33. [DOI: 10.1016/j.maturitas.2016.06.002] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 05/31/2016] [Accepted: 06/01/2016] [Indexed: 12/19/2022]
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32
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Townsley DM, Dumitriu B, Liu D, Biancotto A, Weinstein B, Chen C, Hardy N, Mihalek AD, Lingala S, Kim YJ, Yao J, Jones E, Gochuico BR, Heller T, Wu CO, Calado RT, Scheinberg P, Young NS. Danazol Treatment for Telomere Diseases. N Engl J Med 2016; 374:1922-31. [PMID: 27192671 PMCID: PMC4968696 DOI: 10.1056/nejmoa1515319] [Citation(s) in RCA: 239] [Impact Index Per Article: 29.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
BACKGROUND Genetic defects in telomere maintenance and repair cause bone marrow failure, liver cirrhosis, and pulmonary fibrosis, and they increase susceptibility to cancer. Historically, androgens have been useful as treatment for marrow failure syndromes. In tissue culture and animal models, sex hormones regulate expression of the telomerase gene. METHODS In a phase 1-2 prospective study involving patients with telomere diseases, we administered the synthetic sex hormone danazol orally at a dose of 800 mg per day for a total of 24 months. The goal of treatment was the attenuation of accelerated telomere attrition, and the primary efficacy end point was a 20% reduction in the annual rate of telomere attrition measured at 24 months. The occurrence of toxic effects of treatment was the primary safety end point. Hematologic response to treatment at various time points was the secondary efficacy end point. RESULTS After 27 patients were enrolled, the study was halted early, because telomere attrition was reduced in all 12 patients who could be evaluated for the primary end point; in the intention-to-treat analysis, 12 of 27 patients (44%; 95% confidence interval [CI], 26 to 64) met the primary efficacy end point. Unexpectedly, almost all the patients (11 of 12, 92%) had a gain in telomere length at 24 months as compared with baseline (mean increase, 386 bp [95% CI, 178 to 593]); in exploratory analyses, similar increases were observed at 6 months (16 of 21 patients; mean increase, 175 bp [95% CI, 79 to 271]) and 12 months (16 of 18 patients; mean increase, 360 bp [95% CI, 209 to 512]). Hematologic responses occurred in 19 of 24 patients (79%) who could be evaluated at 3 months and in 10 of 12 patients (83%) who could be evaluated at 24 months. Known adverse effects of danazol--elevated liver-enzyme levels and muscle cramps--of grade 2 or less occurred in 41% and 33% of the patients, respectively. CONCLUSIONS In our study, treatment with danazol led to telomere elongation in patients with telomere diseases. (Funded by the National Institutes of Health; ClinicalTrials.gov number, NCT01441037.).
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Affiliation(s)
- Danielle M Townsley
- From the Hematology Branch (D.M.T., B.D., D.L., B.W., C.C., N.H., N.S.Y.), the Cardiopulmonary Branch (A.D.M.), and the Office of Biostatistics Research (C.O.W.), National Heart, Lung, and Blood Institute, the Center for Human Immunology, Autoimmunity, and Inflammation (A.B.), the Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases (S.L., Y.J.K., T.H.), Radiology and Imaging Sciences, Clinical Center (J.Y., E.J.), and the Medical Genetics Branch, National Human Genome Research Institute (B.R.G.), National Institutes of Health, Bethesda, MD; and the Department of Internal Medicine, University of São Paulo at Ribeirão Preto Medical School, Ribeirão Preto (R.T.C.), and Clinical Hematology, Antônio Ermírio de Moraes Cancer Center, Hospital São José and Beneficência Portuguesa (P.S.), São Paulo
| | - Bogdan Dumitriu
- From the Hematology Branch (D.M.T., B.D., D.L., B.W., C.C., N.H., N.S.Y.), the Cardiopulmonary Branch (A.D.M.), and the Office of Biostatistics Research (C.O.W.), National Heart, Lung, and Blood Institute, the Center for Human Immunology, Autoimmunity, and Inflammation (A.B.), the Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases (S.L., Y.J.K., T.H.), Radiology and Imaging Sciences, Clinical Center (J.Y., E.J.), and the Medical Genetics Branch, National Human Genome Research Institute (B.R.G.), National Institutes of Health, Bethesda, MD; and the Department of Internal Medicine, University of São Paulo at Ribeirão Preto Medical School, Ribeirão Preto (R.T.C.), and Clinical Hematology, Antônio Ermírio de Moraes Cancer Center, Hospital São José and Beneficência Portuguesa (P.S.), São Paulo
| | - Delong Liu
- From the Hematology Branch (D.M.T., B.D., D.L., B.W., C.C., N.H., N.S.Y.), the Cardiopulmonary Branch (A.D.M.), and the Office of Biostatistics Research (C.O.W.), National Heart, Lung, and Blood Institute, the Center for Human Immunology, Autoimmunity, and Inflammation (A.B.), the Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases (S.L., Y.J.K., T.H.), Radiology and Imaging Sciences, Clinical Center (J.Y., E.J.), and the Medical Genetics Branch, National Human Genome Research Institute (B.R.G.), National Institutes of Health, Bethesda, MD; and the Department of Internal Medicine, University of São Paulo at Ribeirão Preto Medical School, Ribeirão Preto (R.T.C.), and Clinical Hematology, Antônio Ermírio de Moraes Cancer Center, Hospital São José and Beneficência Portuguesa (P.S.), São Paulo
| | - Angélique Biancotto
- From the Hematology Branch (D.M.T., B.D., D.L., B.W., C.C., N.H., N.S.Y.), the Cardiopulmonary Branch (A.D.M.), and the Office of Biostatistics Research (C.O.W.), National Heart, Lung, and Blood Institute, the Center for Human Immunology, Autoimmunity, and Inflammation (A.B.), the Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases (S.L., Y.J.K., T.H.), Radiology and Imaging Sciences, Clinical Center (J.Y., E.J.), and the Medical Genetics Branch, National Human Genome Research Institute (B.R.G.), National Institutes of Health, Bethesda, MD; and the Department of Internal Medicine, University of São Paulo at Ribeirão Preto Medical School, Ribeirão Preto (R.T.C.), and Clinical Hematology, Antônio Ermírio de Moraes Cancer Center, Hospital São José and Beneficência Portuguesa (P.S.), São Paulo
| | - Barbara Weinstein
- From the Hematology Branch (D.M.T., B.D., D.L., B.W., C.C., N.H., N.S.Y.), the Cardiopulmonary Branch (A.D.M.), and the Office of Biostatistics Research (C.O.W.), National Heart, Lung, and Blood Institute, the Center for Human Immunology, Autoimmunity, and Inflammation (A.B.), the Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases (S.L., Y.J.K., T.H.), Radiology and Imaging Sciences, Clinical Center (J.Y., E.J.), and the Medical Genetics Branch, National Human Genome Research Institute (B.R.G.), National Institutes of Health, Bethesda, MD; and the Department of Internal Medicine, University of São Paulo at Ribeirão Preto Medical School, Ribeirão Preto (R.T.C.), and Clinical Hematology, Antônio Ermírio de Moraes Cancer Center, Hospital São José and Beneficência Portuguesa (P.S.), São Paulo
| | - Christina Chen
- From the Hematology Branch (D.M.T., B.D., D.L., B.W., C.C., N.H., N.S.Y.), the Cardiopulmonary Branch (A.D.M.), and the Office of Biostatistics Research (C.O.W.), National Heart, Lung, and Blood Institute, the Center for Human Immunology, Autoimmunity, and Inflammation (A.B.), the Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases (S.L., Y.J.K., T.H.), Radiology and Imaging Sciences, Clinical Center (J.Y., E.J.), and the Medical Genetics Branch, National Human Genome Research Institute (B.R.G.), National Institutes of Health, Bethesda, MD; and the Department of Internal Medicine, University of São Paulo at Ribeirão Preto Medical School, Ribeirão Preto (R.T.C.), and Clinical Hematology, Antônio Ermírio de Moraes Cancer Center, Hospital São José and Beneficência Portuguesa (P.S.), São Paulo
| | - Nathan Hardy
- From the Hematology Branch (D.M.T., B.D., D.L., B.W., C.C., N.H., N.S.Y.), the Cardiopulmonary Branch (A.D.M.), and the Office of Biostatistics Research (C.O.W.), National Heart, Lung, and Blood Institute, the Center for Human Immunology, Autoimmunity, and Inflammation (A.B.), the Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases (S.L., Y.J.K., T.H.), Radiology and Imaging Sciences, Clinical Center (J.Y., E.J.), and the Medical Genetics Branch, National Human Genome Research Institute (B.R.G.), National Institutes of Health, Bethesda, MD; and the Department of Internal Medicine, University of São Paulo at Ribeirão Preto Medical School, Ribeirão Preto (R.T.C.), and Clinical Hematology, Antônio Ermírio de Moraes Cancer Center, Hospital São José and Beneficência Portuguesa (P.S.), São Paulo
| | - Andrew D Mihalek
- From the Hematology Branch (D.M.T., B.D., D.L., B.W., C.C., N.H., N.S.Y.), the Cardiopulmonary Branch (A.D.M.), and the Office of Biostatistics Research (C.O.W.), National Heart, Lung, and Blood Institute, the Center for Human Immunology, Autoimmunity, and Inflammation (A.B.), the Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases (S.L., Y.J.K., T.H.), Radiology and Imaging Sciences, Clinical Center (J.Y., E.J.), and the Medical Genetics Branch, National Human Genome Research Institute (B.R.G.), National Institutes of Health, Bethesda, MD; and the Department of Internal Medicine, University of São Paulo at Ribeirão Preto Medical School, Ribeirão Preto (R.T.C.), and Clinical Hematology, Antônio Ermírio de Moraes Cancer Center, Hospital São José and Beneficência Portuguesa (P.S.), São Paulo
| | - Shilpa Lingala
- From the Hematology Branch (D.M.T., B.D., D.L., B.W., C.C., N.H., N.S.Y.), the Cardiopulmonary Branch (A.D.M.), and the Office of Biostatistics Research (C.O.W.), National Heart, Lung, and Blood Institute, the Center for Human Immunology, Autoimmunity, and Inflammation (A.B.), the Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases (S.L., Y.J.K., T.H.), Radiology and Imaging Sciences, Clinical Center (J.Y., E.J.), and the Medical Genetics Branch, National Human Genome Research Institute (B.R.G.), National Institutes of Health, Bethesda, MD; and the Department of Internal Medicine, University of São Paulo at Ribeirão Preto Medical School, Ribeirão Preto (R.T.C.), and Clinical Hematology, Antônio Ermírio de Moraes Cancer Center, Hospital São José and Beneficência Portuguesa (P.S.), São Paulo
| | - Yun Ju Kim
- From the Hematology Branch (D.M.T., B.D., D.L., B.W., C.C., N.H., N.S.Y.), the Cardiopulmonary Branch (A.D.M.), and the Office of Biostatistics Research (C.O.W.), National Heart, Lung, and Blood Institute, the Center for Human Immunology, Autoimmunity, and Inflammation (A.B.), the Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases (S.L., Y.J.K., T.H.), Radiology and Imaging Sciences, Clinical Center (J.Y., E.J.), and the Medical Genetics Branch, National Human Genome Research Institute (B.R.G.), National Institutes of Health, Bethesda, MD; and the Department of Internal Medicine, University of São Paulo at Ribeirão Preto Medical School, Ribeirão Preto (R.T.C.), and Clinical Hematology, Antônio Ermírio de Moraes Cancer Center, Hospital São José and Beneficência Portuguesa (P.S.), São Paulo
| | - Jianhua Yao
- From the Hematology Branch (D.M.T., B.D., D.L., B.W., C.C., N.H., N.S.Y.), the Cardiopulmonary Branch (A.D.M.), and the Office of Biostatistics Research (C.O.W.), National Heart, Lung, and Blood Institute, the Center for Human Immunology, Autoimmunity, and Inflammation (A.B.), the Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases (S.L., Y.J.K., T.H.), Radiology and Imaging Sciences, Clinical Center (J.Y., E.J.), and the Medical Genetics Branch, National Human Genome Research Institute (B.R.G.), National Institutes of Health, Bethesda, MD; and the Department of Internal Medicine, University of São Paulo at Ribeirão Preto Medical School, Ribeirão Preto (R.T.C.), and Clinical Hematology, Antônio Ermírio de Moraes Cancer Center, Hospital São José and Beneficência Portuguesa (P.S.), São Paulo
| | - Elizabeth Jones
- From the Hematology Branch (D.M.T., B.D., D.L., B.W., C.C., N.H., N.S.Y.), the Cardiopulmonary Branch (A.D.M.), and the Office of Biostatistics Research (C.O.W.), National Heart, Lung, and Blood Institute, the Center for Human Immunology, Autoimmunity, and Inflammation (A.B.), the Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases (S.L., Y.J.K., T.H.), Radiology and Imaging Sciences, Clinical Center (J.Y., E.J.), and the Medical Genetics Branch, National Human Genome Research Institute (B.R.G.), National Institutes of Health, Bethesda, MD; and the Department of Internal Medicine, University of São Paulo at Ribeirão Preto Medical School, Ribeirão Preto (R.T.C.), and Clinical Hematology, Antônio Ermírio de Moraes Cancer Center, Hospital São José and Beneficência Portuguesa (P.S.), São Paulo
| | - Bernadette R Gochuico
- From the Hematology Branch (D.M.T., B.D., D.L., B.W., C.C., N.H., N.S.Y.), the Cardiopulmonary Branch (A.D.M.), and the Office of Biostatistics Research (C.O.W.), National Heart, Lung, and Blood Institute, the Center for Human Immunology, Autoimmunity, and Inflammation (A.B.), the Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases (S.L., Y.J.K., T.H.), Radiology and Imaging Sciences, Clinical Center (J.Y., E.J.), and the Medical Genetics Branch, National Human Genome Research Institute (B.R.G.), National Institutes of Health, Bethesda, MD; and the Department of Internal Medicine, University of São Paulo at Ribeirão Preto Medical School, Ribeirão Preto (R.T.C.), and Clinical Hematology, Antônio Ermírio de Moraes Cancer Center, Hospital São José and Beneficência Portuguesa (P.S.), São Paulo
| | - Theo Heller
- From the Hematology Branch (D.M.T., B.D., D.L., B.W., C.C., N.H., N.S.Y.), the Cardiopulmonary Branch (A.D.M.), and the Office of Biostatistics Research (C.O.W.), National Heart, Lung, and Blood Institute, the Center for Human Immunology, Autoimmunity, and Inflammation (A.B.), the Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases (S.L., Y.J.K., T.H.), Radiology and Imaging Sciences, Clinical Center (J.Y., E.J.), and the Medical Genetics Branch, National Human Genome Research Institute (B.R.G.), National Institutes of Health, Bethesda, MD; and the Department of Internal Medicine, University of São Paulo at Ribeirão Preto Medical School, Ribeirão Preto (R.T.C.), and Clinical Hematology, Antônio Ermírio de Moraes Cancer Center, Hospital São José and Beneficência Portuguesa (P.S.), São Paulo
| | - Colin O Wu
- From the Hematology Branch (D.M.T., B.D., D.L., B.W., C.C., N.H., N.S.Y.), the Cardiopulmonary Branch (A.D.M.), and the Office of Biostatistics Research (C.O.W.), National Heart, Lung, and Blood Institute, the Center for Human Immunology, Autoimmunity, and Inflammation (A.B.), the Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases (S.L., Y.J.K., T.H.), Radiology and Imaging Sciences, Clinical Center (J.Y., E.J.), and the Medical Genetics Branch, National Human Genome Research Institute (B.R.G.), National Institutes of Health, Bethesda, MD; and the Department of Internal Medicine, University of São Paulo at Ribeirão Preto Medical School, Ribeirão Preto (R.T.C.), and Clinical Hematology, Antônio Ermírio de Moraes Cancer Center, Hospital São José and Beneficência Portuguesa (P.S.), São Paulo
| | - Rodrigo T Calado
- From the Hematology Branch (D.M.T., B.D., D.L., B.W., C.C., N.H., N.S.Y.), the Cardiopulmonary Branch (A.D.M.), and the Office of Biostatistics Research (C.O.W.), National Heart, Lung, and Blood Institute, the Center for Human Immunology, Autoimmunity, and Inflammation (A.B.), the Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases (S.L., Y.J.K., T.H.), Radiology and Imaging Sciences, Clinical Center (J.Y., E.J.), and the Medical Genetics Branch, National Human Genome Research Institute (B.R.G.), National Institutes of Health, Bethesda, MD; and the Department of Internal Medicine, University of São Paulo at Ribeirão Preto Medical School, Ribeirão Preto (R.T.C.), and Clinical Hematology, Antônio Ermírio de Moraes Cancer Center, Hospital São José and Beneficência Portuguesa (P.S.), São Paulo
| | - Phillip Scheinberg
- From the Hematology Branch (D.M.T., B.D., D.L., B.W., C.C., N.H., N.S.Y.), the Cardiopulmonary Branch (A.D.M.), and the Office of Biostatistics Research (C.O.W.), National Heart, Lung, and Blood Institute, the Center for Human Immunology, Autoimmunity, and Inflammation (A.B.), the Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases (S.L., Y.J.K., T.H.), Radiology and Imaging Sciences, Clinical Center (J.Y., E.J.), and the Medical Genetics Branch, National Human Genome Research Institute (B.R.G.), National Institutes of Health, Bethesda, MD; and the Department of Internal Medicine, University of São Paulo at Ribeirão Preto Medical School, Ribeirão Preto (R.T.C.), and Clinical Hematology, Antônio Ermírio de Moraes Cancer Center, Hospital São José and Beneficência Portuguesa (P.S.), São Paulo
| | - Neal S Young
- From the Hematology Branch (D.M.T., B.D., D.L., B.W., C.C., N.H., N.S.Y.), the Cardiopulmonary Branch (A.D.M.), and the Office of Biostatistics Research (C.O.W.), National Heart, Lung, and Blood Institute, the Center for Human Immunology, Autoimmunity, and Inflammation (A.B.), the Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases (S.L., Y.J.K., T.H.), Radiology and Imaging Sciences, Clinical Center (J.Y., E.J.), and the Medical Genetics Branch, National Human Genome Research Institute (B.R.G.), National Institutes of Health, Bethesda, MD; and the Department of Internal Medicine, University of São Paulo at Ribeirão Preto Medical School, Ribeirão Preto (R.T.C.), and Clinical Hematology, Antônio Ermírio de Moraes Cancer Center, Hospital São José and Beneficência Portuguesa (P.S.), São Paulo
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Scinicariello F, Buser MC. Polychlorinated Biphenyls and Leukocyte Telomere Length: An Analysis of NHANES 1999-2002. EBioMedicine 2015; 2:1974-9. [PMID: 26844276 PMCID: PMC4703734 DOI: 10.1016/j.ebiom.2015.11.028] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Revised: 11/13/2015] [Accepted: 11/17/2015] [Indexed: 11/16/2022] Open
Abstract
Polychlorinated biphenyls (PCBs) induce the expression of the proto-oncogene c-myc which has a role in cellular growth and proliferation programs. The c-myc up-regulates the telomerase reverse transcriptase which adds the telomeres repeating sequences to the chromosomal ends to compensate for the progressive loss of telomeric sequence. We performed multivariate linear regression to analyze the association of PCBs, polychlorinated dibenzo-p-dioxins, and 1,2,3,4,6,7,8-heptachlorodibenzofuran with leukocyte telomere length (LTL) in the adult population (n = 2413) of the National Health and Nutrition Examination Survey 1999-2002. LTL was natural log-transformed and the results were re-transformed and presented as percent differences. Individuals in the 3rd and 4th quartiles of the sum of PCBs were associated with 8.33% (95% CI: 4.08-13.88) and 11.63% (95% CI: 6.18-17.35) longer LTLs, respectively, compared with the lowest quartile, with evidence of a dose-response relationship (p-trend < 0.01). The association of the sum PCBs with longer LTL was found in both sexes. Additionally, 1,2,3,4,6,7,8-heptachlorodibenzofuran and 1,2,3,6,7,8-hexachlorodibenzo-p-dioxin were associated with longer LTL. The age independent association between longer LTL and environmental exposures to PCBs, 1,2,3,4,6,7,8-heptachlorodibenzofuran and 1,2,3,6,7,8-hexachlorodibenzo-p-dioxin may support a role as tumor promoter of these compounds. Further studies to evaluate the effect of these compounds on LTL are needed to more fully understand the implications of our finding.
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Affiliation(s)
- Franco Scinicariello
- Division of Toxicology and Human Health Sciences, Agency for Toxic Substances and Disease Registry (ATSDR), Atlanta, GA 30341, USA
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Bodelon C, Heaphy CM, Meeker AK, Geller B, Vacek PM, Weaver DL, Chicoine RE, Shepherd JA, Mahmoudzadeh AP, Patel DA, Brinton LA, Sherman ME, Gierach GL. Leukocyte telomere length and its association with mammographic density and proliferative diagnosis among women undergoing diagnostic image-guided breast biopsy. BMC Cancer 2015; 15:823. [PMID: 26519084 PMCID: PMC4628256 DOI: 10.1186/s12885-015-1860-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Accepted: 10/27/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Elevated mammographic density (MD) is a strong breast cancer risk factor but the mechanisms underlying the association are poorly understood. High MD and breast cancer risk may reflect cumulative exposures to factors that promote epithelial cell division. One marker of cellular replicative history is telomere length, but its association with MD is unknown. We investigated the relation of telomere length, a marker of cellular replicative history, with MD and biopsy diagnosis. METHODS One hundred and ninety-five women, ages 40-65, were clinically referred for image-guided breast biopsies at an academic facility in Vermont. Relative peripheral blood leukocyte telomere length (LTL) was measured using quantitative polymerase chain reaction. MD volume was quantified in cranio-caudal views of the breast contralateral to the primary diagnosis in digital mammograms using a breast density phantom, while MD area (cm(2)) was measured using thresholding software. Associations between log-transformed LTL and continuous MD measurements (volume and area) were evaluated using linear regression models adjusted for age and body mass index. Analyses were stratified by biopsy diagnosis: proliferative (hyperplasia, in-situ or invasive carcinoma) or non-proliferative (benign or other non-proliferative benign diagnoses). RESULTS Mean relative LTL in women with proliferative disease (n = 141) was 1.6 (SD = 0.9) vs. 1.2 (SD = 0.6) in those with non-proliferative diagnoses (n = 54) (P = 0.002). Mean percent MD volume did not differ by diagnosis (P = 0.69). LTL was not associated with MD in women with proliferative (P = 0.89) or non-proliferative (P = 0.48) diagnoses. However, LTL was associated with a significant increased risk of proliferative diagnosis (adjusted OR = 2.46, 95% CI: 1.47, 4.42). CONCLUSIONS Our analysis of LTL did not find an association with MD. However, our findings suggest that LTL may be a marker of risk for proliferative pathology among women referred for biopsy based on breast imaging.
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Affiliation(s)
- Clara Bodelon
- Hormonal and Reproductive Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, Rockville, MD, USA.
- Division of Cancer Epidemiology and Genetics, 9609 Medical Center Dr., Rm 7-E236, Bethesda, MD, 20892, USA.
| | - Christopher M Heaphy
- Department of Pathology, John Hopkins University School of Medicine, Baltimore, MD, USA.
| | - Alan K Meeker
- Departments of Pathology, Oncology and Urology, John Hopkins University School of Medicine, Baltimore, MD, USA.
| | - Berta Geller
- Department of Health Promotion Research, University of Vermont College of Medicine and Vermont Cancer Center, Burlington, VT, USA.
| | - Pamela M Vacek
- Department of Biostatistics, University of Vermont College of Medicine and Vermont Cancer Center, Burlington, VT, USA
| | - Donald L Weaver
- Department of Pathology, University of Vermont College of Medicine and Vermont Cancer Center, Burlington, VT, USA.
| | - Rachael E Chicoine
- Office of Health Promotion Research, University of Vermont College of Medicine and Vermont Cancer Center, Burlington, VT, USA.
| | - John A Shepherd
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, CA, USA.
| | - Amir Pasha Mahmoudzadeh
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, CA, USA.
| | - Deesha A Patel
- Hormonal and Reproductive Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, Rockville, MD, USA.
| | - Louise A Brinton
- Hormonal and Reproductive Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, Rockville, MD, USA.
| | - Mark E Sherman
- Breast and Gynecologic Cancer Research Group, Division of Cancer Prevention, National Cancer Institute, Rockville, MD, USA.
| | - Gretchen L Gierach
- Hormonal and Reproductive Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, Rockville, MD, USA.
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Telomere length is not associated with frailty in older Chinese elderly: Cross-sectional and longitudinal analysis. Mech Ageing Dev 2015; 152:74-9. [PMID: 26483096 DOI: 10.1016/j.mad.2015.10.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Revised: 08/30/2015] [Accepted: 10/09/2015] [Indexed: 11/23/2022]
Abstract
Telomere shortening has been associated with biological age and several chronic degenerative diseases. However, less is known about telomere length and frailty, which is an indicator of biological age. This study examines the association between telomere length and frailty in a prospective study over five years of 2006 men and women aged 65 years and older living in the community. The frailty status was determined by the Fried's criteria. Telomere length in leukocytes was measured using the quantitative polymerase chain reaction. Logistic regression was used to examine the association between telomere length and incidence of frailty. Among 2006 subjects (mean age 72.4±5.1 years, 51.3% women), the mean telomere length at baseline was 9.1±2.0kb and the frailty phenotype was detected in 127 subjects (6.3%). Male gender was related to shorter telomere length, with increased years of age related to a shortened telomere length (P<0.05). In both men and women, no statistically significant difference of telomere length and the frailty phenotype was observed at baseline. After 4 years of follow-up, 116 cases of frailty were identified. There was no association between telomere length and incident frailty. In conclusion, telomere length was not associated with frailty in this study population.
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Telomere length and polyunsaturated fatty acids. Nutrition 2014; 30:1218-21. [DOI: 10.1016/j.nut.2014.04.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Accepted: 04/02/2014] [Indexed: 11/19/2022]
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Silencing of the hTERT gene by shRNA inhibits colon cancer SW480 cell growth in vitro and in vivo. PLoS One 2014; 9:e107019. [PMID: 25207650 PMCID: PMC4160217 DOI: 10.1371/journal.pone.0107019] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Accepted: 04/14/2014] [Indexed: 01/17/2023] Open
Abstract
Human telomerase reverse transcriptase (hTERT) is the key enzyme responsible for synthesizing and maintaining the telomeres on the ends of chromosomes, and it is essential for cell proliferation. This has made hTERT a focus of oncology research and an attractive target for anticancer drug development. In this study, we designed a small interfering RNA (siRNA) targeting the catalytic subunit of hTERT and tested its effects on the growth of telomerase-positive human colon carcinoma SW480 cells in vitro, as well as on the tumorigenicity of these cells in nude mice. Transient and stable transfection of hTERT siRNA into colon cancer SW480 cells suppressed hTERT expression, reduced telomerase activity and inhibited cell growth and proliferation. Knocking down hTERT expression in SW480 tumors xenografted into nude mice significantly slowed tumor growth and promoted tumor cell apoptosis. Our results suggest that hTERT is involved in carcinogenesis of human colon carcinoma, and they highlight the therapeutic potential of a hTERT knock-down approach.
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Marzetti E, Lorenzi M, Antocicco M, Bonassi S, Celi M, Mastropaolo S, Settanni S, Valdiglesias V, Landi F, Bernabei R, Onder G. Shorter telomeres in peripheral blood mononuclear cells from older persons with sarcopenia: results from an exploratory study. Front Aging Neurosci 2014; 6:233. [PMID: 25221511 PMCID: PMC4147848 DOI: 10.3389/fnagi.2014.00233] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Accepted: 08/13/2014] [Indexed: 01/06/2023] Open
Abstract
Background: Telomere shortening in peripheral blood mononuclear cells (PBMCs) has been associated with biological age and several chronic degenerative diseases. However, the relationship between telomere length and sarcopenia, a hallmark of the aging process, is unknown. The aim of the present study was therefore to determine whether PBMC telomeres obtained from sarcopenic older persons were shorter relative to non-sarcopenic peers. We further explored if PBMC telomere length was associated with frailty, a major clinical correlate of sarcopenia. Methods: Analyses were conducted in 142 persons aged ≥65 years referred to a geriatric outpatient clinic (University Hospital). The presence of sarcopenia was established according to the European Working Group on Sarcopenia in Older People criteria, with bioelectrical impedance analysis used for muscle mass estimation. The frailty status was determined by both the Fried’s criteria (physical frailty, PF) and a modified Rockwood’s frailty index (FI). Telomere length was measured in PBMCs by quantitative real-time polymerase chain reaction according to the telomere/single-copy gene ratio (T/S) method. Results: Among 142 outpatients (mean age 75.0 ± 6.5 years, 59.2% women), sarcopenia was diagnosed in 23 individuals (19.3%). The PF phenotype was detected in 74 participants (52.1%). The average FI score was 0.46 ± 0.17. PBMC telomeres were shorter in sarcopenic subjects (T/S = 0.21; 95% CI: 0.18–0.24) relative to non-sarcopenic individuals (T/S = 0.26; 95% CI: 0.24–0.28; p = 0.01), independent of age, gender, smoking habit, or comorbidity. No significant associations were determined between telomere length and either PF or the FI. Conclusion: PBMC telomere length, expressed as T/S values, is shorter in older outpatients with sarcopenia. The cross-sectional assessment of PBMC telomere length is not sufficient at capturing the complex, multidimensional syndrome of frailty.
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Affiliation(s)
- Emanuele Marzetti
- Department of Geriatrics, Neurosciences and Orthopedics, Teaching Hospital "Agostino Gemelli", Catholic University of the Sacred Heart School of Medicine , Rome , Italy
| | - Maria Lorenzi
- Department of Geriatrics, Neurosciences and Orthopedics, Teaching Hospital "Agostino Gemelli", Catholic University of the Sacred Heart School of Medicine , Rome , Italy
| | - Manuela Antocicco
- Department of Geriatrics, Neurosciences and Orthopedics, Teaching Hospital "Agostino Gemelli", Catholic University of the Sacred Heart School of Medicine , Rome , Italy
| | - Stefano Bonassi
- Unit of Clinical and Molecular Epidemiology, IRCCS San Raffaele Pisana , Rome , Italy
| | - Michela Celi
- Department of Geriatrics, Neurosciences and Orthopedics, Teaching Hospital "Agostino Gemelli", Catholic University of the Sacred Heart School of Medicine , Rome , Italy
| | - Simona Mastropaolo
- Department of Geriatrics, Neurosciences and Orthopedics, Teaching Hospital "Agostino Gemelli", Catholic University of the Sacred Heart School of Medicine , Rome , Italy
| | - Silvana Settanni
- Department of Geriatrics, Neurosciences and Orthopedics, Teaching Hospital "Agostino Gemelli", Catholic University of the Sacred Heart School of Medicine , Rome , Italy
| | - Vanessa Valdiglesias
- DICOMOSA Group, Department of Psychology, Area of Psychobiology, University of A Coruña , A Coruña , Spain
| | - Francesco Landi
- Department of Geriatrics, Neurosciences and Orthopedics, Teaching Hospital "Agostino Gemelli", Catholic University of the Sacred Heart School of Medicine , Rome , Italy
| | - Roberto Bernabei
- Department of Geriatrics, Neurosciences and Orthopedics, Teaching Hospital "Agostino Gemelli", Catholic University of the Sacred Heart School of Medicine , Rome , Italy
| | - Graziano Onder
- Department of Geriatrics, Neurosciences and Orthopedics, Teaching Hospital "Agostino Gemelli", Catholic University of the Sacred Heart School of Medicine , Rome , Italy
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The 58-kda microspherule protein (MSP58) represses human telomerase reverse transcriptase (hTERT) gene expression and cell proliferation by interacting with telomerase transcriptional element-interacting factor (TEIF). BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2014; 1843:565-79. [PMID: 24361335 DOI: 10.1016/j.bbamcr.2013.12.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Revised: 11/13/2013] [Accepted: 12/04/2013] [Indexed: 11/21/2022]
Abstract
58-kDa microspherule protein (MSP58) plays an important role in a variety of cellular processes including transcriptional regulation, cell proliferation and oncogenic transformation. Currently, the mechanisms underlying the oncogenic effect of MSP58 are not fully understood. The human telomerase reverse transcriptase (hTERT) gene, which encodes an essential component for telomerase activity that is involved in cellular immortalization and transformation, is strictly regulated at the gene transcription level. Our previous study revealed a novel function of MSP58 in cellular senescence. Here we identify telomerase transcriptional element-interacting factor (TEIF) as a novel MSP58-interacting protein and determine the effect of MSP58 on hTERT transcription. This study thus provides evidence showing MSP58 to be a negative regulator of hTERT expression and telomerase activity. Luciferase reporter assays indicated that MSP58 could suppress the transcription ofhTERTpromoter. Additionally, stable overexpression of MSP58 protein in HT1080 and 293T cells decreased both endogenous hTERT expression and telomerase activity. Conversely, their upregulation was induced by MSP58 silencing. Chromatin immunoprecipitation assays showed that MSP58 binds to the hTERT proximal promoter. Furthermore, overexpression of MSP58 inhibited TEIF-mediated hTERT transactivation, telomerase activation, and cell proliferation promotion. The inhibitory effect of MSP58 occurred through inhibition of TEIF binding to DNA. Ultimately, the HT1080-implanted xenograft mouse model confirmed these cellular effects. Together, our findings provide new insights into both the biological function of MSP58 and the regulation of telomerase/hTERT expression.
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Boccardi V, Paolisso G. Telomerase activation: a potential key modulator for human healthspan and longevity. Ageing Res Rev 2014; 15:1-5. [PMID: 24561251 DOI: 10.1016/j.arr.2013.12.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Revised: 12/18/2013] [Accepted: 12/23/2013] [Indexed: 12/12/2022]
Abstract
The elderly population is increasing progressively. Along with this increase the number of age related diseases, such as cardiovascular, neurodegenerative diseases, metabolic impairment and cancer, is also on the rise thereby negatively impacting the burden on health care systems. Telomere shortening and dysfunction results in cellular senescence, an irreversible proliferative arrest that has been suggested to promote organismal aging and disabling age-related diseases. Given that telomerase, the enzyme responsible for maintaining telomere lengths, is not expressed at levels sufficient to prevent telomere shortening in most of our cells, telomeres progressively erode with advancing age. Telomerase activation, therefore, might serve as a viable therapeutic strategy to delay the onset of cellular senescence, tissue dysfunction and organismal decline. Here we analyze the more recent findings in telomerase activation as a potential key modulator for human healthspan and longevity.
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Dracxler RC, Oh C, Kalmbach K, Wang F, Liu L, Kallas EG, Giret MTM, Seth-Smith ML, Antunes D, Keefe DL, Abrao MS. Peripheral blood telomere content is greater in patients with endometriosis than in controls. Reprod Sci 2014; 21:1465-71. [PMID: 24675987 DOI: 10.1177/1933719114527353] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
UNLABELLED The etiology of endometriosis remains poorly understood but circulating stem cells may contribute. Telomeres shorten with cell divisions and age. Stem cells attempt to compensate for telomere attrition through the action of telomerase. Since circulating stem cells may contribute to endometriosis, we compared telomere content in lymphocytes of patients with and without endometriosis. METHODS Observational study comparing peripheral lymphocytes telomere content, measured by quantitative polymerase chain reaction, in patients with (n = 86) and without endometriosis (n = 21). FINDINGS Patients with endometriosis had longer telomeres than that of matched, endometriosis-free controls (telomere to single copy gene ratio [T/S ratio] of 1.62 vs 1.34, respectively, P = .00002). Patients with endometriosis were 8.1-fold more likely to have long telomeres. (odds ratio = 8.1, 95% confidence interval: 1.28-51.57, P = .0264). INTERPRETATION Longer telomeres could be consistent with a stem cell origin of endometriosis.
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Affiliation(s)
- Roberta C Dracxler
- Obstetrics and Gynecology Department of New York University School of Medicine, New York, NY, USA Endometriosis Department of the Medical School of Sao Paulo University, Sao Paulo, SP, Brazil
| | - C Oh
- Obstetrics and Gynecology Department of New York University School of Medicine, New York, NY, USA
| | - K Kalmbach
- Obstetrics and Gynecology Department of New York University School of Medicine, New York, NY, USA
| | - F Wang
- Obstetrics and Gynecology Department of New York University School of Medicine, New York, NY, USA
| | - L Liu
- Obstetrics and Gynecology Department of New York University School of Medicine, New York, NY, USA
| | - E G Kallas
- Immunology Department of the Medical School of Sao Paulo University, Sao Paulo, SP, Brazil
| | - M T M Giret
- Immunology Department of the Medical School of Sao Paulo University, Sao Paulo, SP, Brazil
| | - M L Seth-Smith
- Obstetrics and Gynecology Department of New York University School of Medicine, New York, NY, USA
| | - D Antunes
- Obstetrics and Gynecology Department of New York University School of Medicine, New York, NY, USA
| | - D L Keefe
- Obstetrics and Gynecology Department of New York University School of Medicine, New York, NY, USA
| | - M S Abrao
- Endometriosis Department of the Medical School of Sao Paulo University, Sao Paulo, SP, Brazil
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Pan Q, Hu T, Malley JD, Andrew AS, Karagas MR, Moore JH. A system-level pathway-phenotype association analysis using synthetic feature random forest. Genet Epidemiol 2014; 38:209-19. [PMID: 24535726 DOI: 10.1002/gepi.21794] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2013] [Revised: 11/21/2013] [Accepted: 01/02/2014] [Indexed: 11/07/2022]
Abstract
As the cost of genome-wide genotyping decreases, the number of genome-wide association studies (GWAS) has increased considerably. However, the transition from GWAS findings to the underlying biology of various phenotypes remains challenging. As a result, due to its system-level interpretability, pathway analysis has become a popular tool for gaining insights on the underlying biology from high-throughput genetic association data. In pathway analyses, gene sets representing particular biological processes are tested for significant associations with a given phenotype. Most existing pathway analysis approaches rely on single-marker statistics and assume that pathways are independent of each other. As biological systems are driven by complex biomolecular interactions, embracing the complex relationships between single-nucleotide polymorphisms (SNPs) and pathways needs to be addressed. To incorporate the complexity of gene-gene interactions and pathway-pathway relationships, we propose a system-level pathway analysis approach, synthetic feature random forest (SF-RF), which is designed to detect pathway-phenotype associations without making assumptions about the relationships among SNPs or pathways. In our approach, the genotypes of SNPs in a particular pathway are aggregated into a synthetic feature representing that pathway via Random Forest (RF). Multiple synthetic features are analyzed using RF simultaneously and the significance of a synthetic feature indicates the significance of the corresponding pathway. We further complement SF-RF with pathway-based Statistical Epistasis Network (SEN) analysis that evaluates interactions among pathways. By investigating the pathway SEN, we hope to gain additional insights into the genetic mechanisms contributing to the pathway-phenotype association. We apply SF-RF to a population-based genetic study of bladder cancer and further investigate the mechanisms that help explain the pathway-phenotype associations using SEN. The bladder cancer associated pathways we found are both consistent with existing biological knowledge and reveal novel and plausible hypotheses for future biological validations.
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Affiliation(s)
- Qinxin Pan
- Department of Genetics, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire, United States of America
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Salehinejad P, Alitheen NB, Mandegary A, Nematollahi-mahani SN, Janzamin E. Effect of EGF and FGF on the expansion properties of human umbilical cord mesenchymal cells. In Vitro Cell Dev Biol Anim 2013; 49:515-23. [DOI: 10.1007/s11626-013-9631-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2013] [Accepted: 04/29/2013] [Indexed: 12/13/2022]
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Chen Y, Wang K, Gong YG, Khoo SK, Leach R. Roles of CDX2 and EOMES in human induced trophoblast progenitor cells. Biochem Biophys Res Commun 2013; 431:197-202. [PMID: 23313847 DOI: 10.1016/j.bbrc.2012.12.135] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Accepted: 12/30/2012] [Indexed: 02/04/2023]
Abstract
Abnormal trophoblast lineage proliferation and differentiation in early pregnancy have been associated with the pathogenesis of placenta diseases of pregnancy. However, there is still a gap in understanding the molecular mechanisms of early placental development due to the limited primary trophoblast cultures and fidelity of immortalized trophoblast lines. Trophoblasts stem (TS) cells, an in vitro model of trophectoderm that can differentiate into syncytiotrophoblasts and extravillous trophoblasts, can be an attractive tool for early pregnancy research. TS cells are well established in mouse but not in humans due to insufficient knowledge of which trophoblast lineage-specific transcription factors are involved in human trophectoderm (TE) proliferation and differentiation. Here, we applied induced pluripotent stem cell technique to investigate the human trophoblast lineage-specific transcription factors. We established human induced trophoblast progenitor (iTP) cells by direct reprogramming the fibroblasts with a pool of mouse trophoblast lineage-specific transcription factors consisting of CDX2, EOMES, and ELF5. The human iTP cells exhibit epithelial morphology and can be maintained in vitro for more than 2 months. Gene expression profile of these cells was tightly clustered with human trophectoderm but not with human neuron progenitor cells, mesenchymal stem cells, or endoderm cells. These cells are capable of differentiating into cells with an invasive capacity, suggesting extravillous trophoblasts. They also form multi-nucleated cells which secrete human chorionic gonadotropin and estradiol, consistent with a syncytiotrophoblast phenotype. Our results provide the evidence that transcription factors CDX2 and EOMES may play critical roles in human iTP cell generation.
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Affiliation(s)
- Ying Chen
- Department of Obstetrics, Gynecology and Reproductive Biology, College of Human Medicine, Michigan State University, Grand Rapids, MI 49503, USA.
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Wang X. Microarray analysis of ageing-related signatures and their expression in tumors based on a computational biology approach. GENOMICS PROTEOMICS & BIOINFORMATICS 2012; 10:136-41. [PMID: 22917186 PMCID: PMC3586943 DOI: 10.1016/j.gpb.2012.01.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 11/20/2011] [Revised: 01/03/2012] [Accepted: 01/30/2012] [Indexed: 12/24/2022]
Abstract
Ageing and cancer have been associated with genetic and genomic changes. The identification of common signatures between ageing and cancer can reveal shared molecular mechanisms underlying them. In this study, we collected ageing-related gene signatures from ten published studies involved in six different human tissues and an online resource. We found that most of these gene signatures were tissue-specific and a few were related to multiple tissues. We performed a genome-wide examination of the expression of these signatures in various human tumor types, and found that a large proportion of these signatures were universally differentially expressed among normal vs. tumor phenotypes. Functional analyses of the highly-overlapping genes between ageing and cancer using DAVID tools have identified important functional categories and pathways linking ageing with cancer. The convergent and divergent mechanisms between ageing and cancer are discussed. This study provides insights into the biology of ageing and cancer, suggesting the possibility of potential interventions aimed at postponing ageing and preventing cancer.
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Affiliation(s)
- Xiaosheng Wang
- Biometric Research Branch, National Cancer Institute, National Institutes of Health, Rockville, MD 20852, USA.
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SHI Y, CUI YH, WU HG, ZHANG W, ZHAO C, LIU HR, GUO LQ, WU BL, YU AZ, ZHANG YY. Effects of mild-warming moxibustion on Bcl-2 and PKC expressions of peripheral blood in elderly people. J TRADIT CHIN MED 2012; 32:45-51. [DOI: 10.1016/s0254-6272(12)60030-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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Niu C, Yip HK. Neuroprotective signaling mechanisms of telomerase are regulated by brain-derived neurotrophic factor in rat spinal cord motor neurons. J Neuropathol Exp Neurol 2011; 70:634-52. [PMID: 21666495 DOI: 10.1097/nen.0b013e318222b97b] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Telomerase can promote neuron survival and can be regulated by growth factors such as brain-derived neurotrophic factor (BDNF). Increases of BDNF expression and telomerase activity after brain injury suggest that telomerase may be involved in BDNF-mediated neuroprotection. We investigated BDNF regulation of telomerase in rat spinal cord motor neurons (SMNs). Our results indicate that BDNF increases telomerase expression and activity levels in SMNs and activates mitogen-activated protein kinase/extracellular signal-regulated kinases 1 and 2 and phosphatidylinositol-3-OH kinase/protein kinase B signals, and their downstream transcription factors nuclear factor-κB, c-Myc, and Sp1. Administration of the tyrosine kinase receptor B inhibitor K-252a, the mitogen-activated protein kinase 1 inhibitor PD98059, and the phosphatidylinositol-3-OH kinase inhibitor LY294002 abolished BDNF-induced upregulation of these transcription factors and telomerase expression. The nuclear factor-κB inhibitor Bay11-7082 also attenuated c-Myc and Sp1 expression and increased telomerase promoter activity. Spinal cord motor neurons with higher telomerase levels induced by BDNF became more resistant to apoptosis; survival of SMNs that overexpressed the catalytic protein component of telomerase with reverse transcriptase activity was also enhanced against apoptosis. The neuronal survival-promoting effect of telomerase was mediated through the regulation of Bcl-2, Bax, p53, and maintenance of mitochondrial membrane potential. Taken together, these data suggest that the neuroprotective effect of BDNF via telomerase is mediated by inhibition of apoptotic pathways.
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Affiliation(s)
- Chenchen Niu
- Department of Anatomy, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong SAR, China
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Histone deacetylase inhibition as an anticancer telomerase-targeting strategy. Int J Cancer 2011; 129:2765-74. [DOI: 10.1002/ijc.26241] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2010] [Accepted: 05/30/2011] [Indexed: 01/14/2023]
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Gladych M, Wojtyla A, Rubis B. Human telomerase expression regulation. Biochem Cell Biol 2011; 89:359-76. [DOI: 10.1139/o11-037] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Since telomerase has been recognized as a relevant factor distinguishing cancer cells from normal cells, it has become a very promising target for anti-cancer therapy. A correlation between short telomere length and increased mortality was revealed in many studies. The telomerase expression/activity appears to be one of the most crucial factors to study to improve cancer therapy and prevention. However, this multisubunit enzymatic complex can be regulated at various levels. Thus, several strategies have been proposed to control telomerase in cancer cells such as anti-sense technology against TR and TERT, ribozymes against TERT, anti-estrogens, progesterone, vitamin D, retinoic acid, quadruplex stabilizers, telomere and telomerase targeting agents, modulation of interaction with other proteins involved in the regulation of telomerase and telomeres, etc. However, the transcription control of key telomerase subunits seems to play the crucial role in whole complexes activity and cancer cells immortality. Thus, the research of telomerase regulation can bring significant insight into the knowledge concerning stem cells metabolism but also ageing. This review summarizes the current state of knowledge of numerous telomerase regulation mechanisms at the transcription level in human that might become attractive anti-cancer therapy targets.
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Affiliation(s)
- Marta Gladych
- Poznan University of Medical Sciences, Department of Clinical Chemistry and Molecular Diagnostics, Przybyszewskiego 49 St., 60-355 Poznan, Poland
| | - Aneta Wojtyla
- Poznan University of Medical Sciences, Department of Clinical Chemistry and Molecular Diagnostics, Przybyszewskiego 49 St., 60-355 Poznan, Poland
| | - Blazej Rubis
- Poznan University of Medical Sciences, Department of Clinical Chemistry and Molecular Diagnostics, Przybyszewskiego 49 St., 60-355 Poznan, Poland
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Abstract
Telomerase, an enzyme complex that binds the chromosome ends (telomeres) and maintains telomere length and integrity, is present in germ cells, proliferative granulosa cells, germline stem cells, and neoplastic cells in the ovary, but it is absent in differentiated or aged cells. Activation of telomerase in the ovary underpins both benign and malignant cell proliferation in several compartments, including the germ cells, membrana granulosa, and the ovarian surface epithelium. The difference in telomerase operation between normal and abnormal cell proliferations may lie in the mechanisms of telomerase activation in a deregulated manner. Recent studies have implicated telomerase activity in ovarian cancer as well as oogenesis and fertility. Inhibition of telomerase and the shortening of telomeres are seen in occult ovarian insufficiency. Studies of how telomerase operates and regulates ovary development may provide insight into the development of both germ cells for ovarian reproductive function and neoplastic cells in ovarian cancer. The current review summarizes the roles of telomerase in the development of oocytes and proliferation of granulosa cells during folliculogenesis and in the process of tumorigenesis. It also describes the regulation of telomerase by estrogen in the ovary.
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