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https://www.readbyqxmd.com/read/28444175/predictive-value-of-telomere-length-on-outcome-following-acute-myocardial-infarction-evidence-for-contrasting-effects-of-vascular-vs-blood-oxidative-stress
#1
Marios Margaritis, Fabio Sanna, George Lazaros, Ioannis Akoumianakis, Sheena Patel, Alexios S Antonopoulos, Chloe Duke, Laura Herdman, Costas Psarros, Evangelos K Oikonomou, Cheerag Shirodaria, Mario Petrou, Rana Sayeed, George Krasopoulos, Regent Lee, Dimitris Tousoulis, Keith M Channon, Charalambos Antoniades
Aims: Experimental evidence suggests that telomere length (TL) is shortened by oxidative DNA damage, reflecting biological aging. We explore the value of blood (BTL) and vascular TL (VTL) as biomarkers of systemic/vascular oxidative stress in humans and test the clinical predictive value of BTL in acute myocardial infarction (AMI). Methods and results: In a prospective cohort of 290 patients surviving recent AMI, BTL measured on admission was a strong predictor of all-cause [hazard ratio (HR) [95% confidence interval (CI)]: 3...
April 24, 2017: European Heart Journal
https://www.readbyqxmd.com/read/28442329/association-of-telomere-length-with-myocardial-infarction-a-prospective-cohort-from-the-population-based-hunt-2-study
#2
REVIEW
Ida Beate Øyen Østhus, Stian Lydersen, Håvard Dalen, Javaid Nauman, Ulrik Wisløff
As possible markers of biological age, telomere length (TL) has been associated with age-related diseases such as myocardial infarction (MI) with conflicting findings. We sought to assess the relationship between TL and risk of future MI in 915 healthy participants (51.7% women) 65 years or older from a population-based prospective cohort (the HUNT 2 study, Norway). Mean TL was measured by quantitative PCR expressed as relative T (telomere repeat copy number) to S (single copy gene number) ratio, and log-transformed...
April 22, 2017: Progress in Cardiovascular Diseases
https://www.readbyqxmd.com/read/28441430/short-telomere-length-is-associated-with-renal-impairment-in-japanese-subjects-with-cardiovascular-risk
#3
Kazuo Eguchi, Lawrence S Honig, Joseph H Lee, Satoshi Hoshide, Kazuomi Kario
INTRODUCTION: Short telomere length has been suggested to be associated with atherosclerotic changes in Western populations. We examined the relationships between leukocyte telomere length and cardiovascular and renal function in a Japanese cohort. PARTICIPANTS AND METHODS: We enrolled 770 subjects who each had at least one cardiovascular risk factor. The mean age was 59.5 ± 12.2 years; mean BMI was 25.1 ± 4.6 kg/m2. We measured leukocyte telomere length (LTL) by quantitative PCR (T/S ratio), and measured other biomarkers from blood and urine samples...
2017: PloS One
https://www.readbyqxmd.com/read/28440422/variable-terra-abundance-and-stability-in-cervical-cancer-cells
#4
Bong-Kyeong Oh, Ponnarath Keo, Jaeman Bae, Jung Hwa Ko, Joong Sub Choi
Telomeres are transcribed into long non-coding RNA, referred to as telomeric repeat-containing RNA (TERRA), which plays important roles in maintaining telomere integrity and heterochromatin formation. TERRA has been well characterized in HeLa cells, a type of cervical cancer cell. However, TERRA abundance and stability have not been examined in other cervical cancer cells, at least to the best of our knowledge. Thus, in this study, we measured TERRA levels and stability, as well as telomere length in 6 cervical cancer cell lines, HeLa, SiHa, CaSki, HeLa S3, C-33A and SNU-17...
April 20, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28439695/usefulness-of-telomere-length-in-dna-from-human-teeth-for-age-estimation
#5
Ana Belén Márquez-Ruiz, Lucas González-Herrera, Aurora Valenzuela
Age estimation is widely used to identify individuals in forensic medicine. However, the accuracy of the most commonly used procedures is markedly reduced in adulthood, and these methods cannot be applied in practice when morphological information is limited. Molecular methods for age estimation have been extensively developed in the last few years. The fact that telomeres shorten at each round of cell division has led to the hypothesis that telomere length can be used as a tool to predict age. The present study thus aimed to assess the correlation between telomere length measured in dental DNA and age, and the effect of sex and tooth type on telomere length; a further aim was to propose a statistical regression model to estimate the biological age based on telomere length...
April 24, 2017: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/28438147/leukocyte-telomere-length-and-depression-anxiety-and-stress-and-adjustment-disorders-in-primary-health-care-patients
#6
Xiao Wang, Kristina Sundquist, Anna Hedelius, Karolina Palmér, Ashfaque A Memon, Jan Sundquist
BACKGROUND: The primary aim was to examine possible differences in telomere length between primary health care patients, with depression, anxiety or stress and adjustment disorders, and healthy controls. The second aim was to examine the association between telomere length and baseline characteristics in the patients. The third aim was to examine the potential effects of the 8-week treatments (mindfulness-based group therapy or treatment as usual, i.e. mostly cognitive-based therapy) on telomere length, and to examine whether there was a difference in the potential effect on telomere length between the two groups...
April 24, 2017: BMC Psychiatry
https://www.readbyqxmd.com/read/28437249/the-differential-spatiotemporal-expression-pattern-of-shelterin-genes-throughout-lifespan
#7
Kay-Dietrich Wagner, Yilin Ying, Waiian Leong, Jie Jiang, Xuefei Hu, Yi Chen, Jean-François Michiels, Yiming Lu, Eric Gilson, Nicole Wagner, Jing Ye
Shelterin forms the core complex of telomere proteins and plays critical roles in protecting telomeres against unwanted activation of the DNA damage response and in Emaintaining telomere length homeostasis. Although shelterin expression is believed to be ubiquitous for stabilization of chromosomal ends. Evidences suggest that some shelterin subunits have tissue-specific functions. However, very little is known regarding how shelterin subunit gene expression is regulated during development and aging. Using two different animal models, the mouse and zebrafish, we reveal herein that shelterin subunits exhibit distinct spatial and temporal expression patterns that do not correlate with the proliferative status of the organ systems examined...
April 17, 2017: Aging
https://www.readbyqxmd.com/read/28434530/accelerated-cellular-senescence-as-underlying-mechanism-for-functionally-impaired-bone-marrow-derived-progenitor-cells-in-ischemic-heart-disease
#8
Evelien Nollet, Vicky Y Hoymans, Inez R Rodrigus, Dina De Bock, Marc Dom, Viviane O M Van Hoof, Christiaan J Vrints, Emeline M Van Craenenbroeck
BACKGROUND AND AIMS: Bone marrow (BM)-derived progenitor cells are functionally impaired in patients with ischemic heart disease (IHD), thereby hampering the outcome of autologous stem cell therapy. In search for underlying mechanisms for this BM dysfunction, accelerated cellular senescence was explored. METHODS: We analysed telomere length of BM-derived mononuclear cells (MNC) by MMqPCR in patients with coronary artery disease (n = 12), ischemic heart failure (HF; n = 9), non-ischemic HF (n = 7) and controls (n = 10), and related it to their myeloid differentiation capacity...
May 2017: Atherosclerosis
https://www.readbyqxmd.com/read/28431907/telomere-shortening-during-aging-attenuation-by-antioxidants-and-anti-inflammatory-agents
#9
REVIEW
Kedar N Prasad, Meixia Wu, Stephen C Bondy
Telomeres are a repeated sequence -of bases found at the ends of chromosomes. In humans, this sequence is TTAGGG, which is repeated over 2000 times. Telomeres protect the ends chromosomes from fusion with nearby chromosomes, and allow effective replication of DNA. Each time a cell divides, 25-200 base pairs are lost from the terminal sequence of chromosomes. By becoming truncated during cell division, telomeres protect essential genes from being shortened and thus inactivated. In addition, telomeres are sensitive to inflammation and oxidative stress, which can further promote telomere shortening...
April 18, 2017: Mechanisms of Ageing and Development
https://www.readbyqxmd.com/read/28428263/different-requirements-of-functional-telomeres-in-neural-stem-cells-and-terminally-differentiated-neurons
#10
Anastasia Lobanova, Robert She, Simon Pieraut, Charlie Clapp, Anton Maximov, Eros Lazzerini Denchi
Telomeres have been studied extensively in peripheral tissues, but their relevance in the nervous system remains poorly understood. Here, we examine the roles of telomeres at distinct stages of murine brain development by using lineage-specific genetic ablation of TRF2, an essential component of the shelterin complex that protects chromosome ends from the DNA damage response machinery. We found that functional telomeres are required for embryonic and adult neurogenesis, but their uncapping has surprisingly no detectable consequences on terminally differentiated neurons...
April 20, 2017: Genes & Development
https://www.readbyqxmd.com/read/28428057/natural-killer-cells-differentiated-in-vitro-from-cord-blood-cd34-cells-are-more-advantageous-for-use-as-an-immunotherapy-than-peripheral-blood-and-cord-blood-natural-killer-cells
#11
Anna Domogala, Michael Blundell, Adrian Thrasher, Mark W Lowdell, J Alejandro Madrigal, Aurore Saudemont
BACKGROUND AIMS: Natural killer (NK) cells have the potential to become a successful immunotherapy as they can target malignant cells without being direct effectors of graft-versus-host disease. Our group has previously shown that large numbers of functional NK cells can be differentiated in vitro from umbilical cord blood (CB) CD34(+) cells. To produce a clinically relevant and effective immunotherapy, we hypothesized that it is essential that the NK cells are able to proliferate and persist in vivo while maintaining an optimal activation status and killing capacity...
April 17, 2017: Cytotherapy
https://www.readbyqxmd.com/read/28426533/hiv-dna-content-in-different-cd4-t-cell-subsets-correlates-with-cd4-cd8-ratio-or-length-of-efficient-treatment
#12
Lara Gibellini, Simone Pecorini, Sara de Biasi, Elena Bianchini, Margherita Digaetano, Marcello Pinti, Gianluca Carnevale, Vanni Borghi, Giovanni Guaraldi, Cristina Mussini, Andrea Cossarizza, Milena Nasi
OBJECTIVES: HIV establishes a latent infection at different degrees within naïve (TN) or central (TCM) and effector memory (TEM) CD4+ T cell. Studying patients in whom HIV production was suppressed by combined antiretroviral therapy (cART), our main aim was to find which factors are related or can influence intracellular viral reservoir in different CD4+ T cell subsets. METHODS: We enrolled 32 HIV+ patients successfully treated for > 2 years, with a CD4+ T cell count > 500 cells/μL and plasma viremia undetectable from at least one year...
April 19, 2017: AIDS
https://www.readbyqxmd.com/read/28425985/the-cellular-senescence-of-leukemia-initiating-cells-from-acute-lymphoblastic-leukemia-is-postponed-by-%C3%AE-arrestin1-binding-with-p300-sp1-to-regulate-htert-transcription
#13
Shan Liu, Haiyan Liu, Ru Qin, Yi Shu, Zhidai Liu, Penghui Zhang, Caiwen Duan, Dengli Hong, Jie Yu, Lin Zou
Although we previously reported that the self-renewal of leukemia-initiating cells of B-lineage acute lymphoblastic leukemia (B-ALL LICs) was regulated by β-Arrestin1, a multiple-function protein, the cellular senescence is critical for LICs fate and leukemia progress, and worthy for further investigation. Here we found that depletion of β-Arrestin1 extended the population doubling time and the percentage of senile cells, the signatures of cellular senescence, of B-ALL LICs. Moreover, lack of β-Arrestin1 enhanced the expression of proteins (CBX, HIRA) and genes (P53, P16) related to senescence in leukemic Reh cells and B-ALL-LICs-derived leukemic mice...
April 20, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28425984/withaferin-a-kills-cancer-cells-with-and-without-telomerase-chemical-computational-and-experimental-evidences
#14
Yue Yu, Shashank P Katiyar, Durai Sundar, Zeenia Kaul, Eijiro Miyako, Zhenya Zhang, Sunil C Kaul, Roger R Reddel, Renu Wadhwa
Maintenance of telomere length is the most consistent attribute of cancer cells. Tightly connected to their capacity to overcome replicative mortality, it is achieved either by activation of telomerase or an Alternative mechanism of Lengthening of Telomeres (ALT). Disruption of either of these mechanisms has been shown to induce DNA damage signalling leading to senescence or apoptosis. Telomerase inhibitors are considered as potential anticancer drugs but are ineffective for ALT cancers (~15% of all cancers)...
April 20, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28425738/the-link-between-discrimination-and-telomere-length-in-african-american-adults
#15
Daniel B Lee, Eric S Kim, Enrique W Neblett
OBJECTIVE: Prior work shows that discrimination is associated with a wide array of negative health outcomes. However, the biological mechanisms through which this link occurs require more study. We evaluated the association between discrimination and leukocyte telomere length (LTL; a biological marker of systemic aging). METHOD: Cross-sectional data were from the Health and Retirement study, a study of people aged 51+ in the United States, and included 595 African American males and females...
May 2017: Health Psychology: Official Journal of the Division of Health Psychology, American Psychological Association
https://www.readbyqxmd.com/read/28424424/leukocyte-telomere-length-related-genetic-variants-in-acyp2-contribute-to-the-risk-of-esophageal-carcinoma-in-chinese-han-population
#16
Quan Fang, Lihong Hui, Zhaorui Min, Lifeng Liu, Yuan Shao
BACKGROUND: Short leukocyte telomere length has been associated with significantly increased risk of esophageal carcinoma. A previous genome-wide association study demonstrated that ACYP2 was associated with leukocyte telomere length. However, the role of ACYP2 genetic variants on esophageal carcinoma susceptibility is still unknown. Therefore, we investigated whether ACYP2 polymorphisms have impact on the risk of esophageal carcinoma in Chinese. MATERIALS AND METHODS: We conducted a case-control study among 386 cases and 495 healthy controls from northwest China...
April 11, 2017: Oncotarget
https://www.readbyqxmd.com/read/28423661/examining-the-association-between-anthropometric-parameters-and-telomere-length-and-mortality-risk
#17
Chen-Jung Wu, Tung-Wei Kao, Yuan-Yung Lin, Fang-Yih Liaw, Li-Wei Wu, Yaw-Wen Chang, Tao-Chun Peng, Wei-Liang Chen
A shorter telomere length is associated with several systemic disorders. Telomere length may be an informative biomarker for the maintenance of the overall health status and mortality. There are a limited number of empirical studies concerning the effect of anthropometric parameters on telomere length. The data are derived from the National Health and Nutrition Examination Survey from 1999 to 2002. The primary outcomes of this study were to examine the potential relationships between the anthropometric indices and the telomere length, while secondary outcomes of this study was to investigate the association between different anthropometric indices and mortality risk...
March 7, 2017: Oncotarget
https://www.readbyqxmd.com/read/28423524/critically-short-telomeres-and-toxicity-of-chemotherapy-in-early-breast-cancer
#18
Miguel Quintela-Fandino, Nora Soberon, Ana Lluch, Luis Manso, Isabel Calvo, Javier Cortes, Fernando Moreno-Antón, Miguel Gil-Gil, Noelia Martinez-Jánez, Antonio Gonzalez-Martin, Encarna Adrover, Raquel de Andres, Gemma Viñas, Antonio Llombart-Cussac, Emilio Alba, Silvana Mouron, Juan Guerra, Begoña Bermejo, Esther Zamora, Jose Angel García-Saenz, Sonia Pernas Simon, Eva Carrasco, María José Escudero, Ruth Campo, Ramón Colomer, Maria A Blasco
Cumulative toxicity from weekly paclitaxel (myalgia, peripheral neuropathy, fatigue) compromises long-term administration. Preclinical data suggest that the burden of critically short telomeres (< 3 kilobases, CSTs), but not average telomere length by itself, accounts for limited tissue renewal and turnover capacity. The impact of this parameter (which can be modified with different therapies) in chemotherapy-derived toxicity has not been studied.Blood from 115 treatment-naive patients from a clinical trial in early HER2-negative breast cancer that received weekly paclitaxel (80 mg/m2 for 12 weeks) either alone or in combination with nintedanib and from 85 healthy controls was prospectively obtained and individual CSTs and average telomere lenght were determined by HT Q-FISH (high-throughput quantitative FISH)...
March 28, 2017: Oncotarget
https://www.readbyqxmd.com/read/28423121/telomere-length-analysis-in-monoclonal-b-cell-lymphocytosis-and-chronic-lymphocytic-leukemia-binet-a
#19
F M Furtado, P S Scheucher, B A Santana, N F Scatena, R T Calado, E M Rego, D M Matos, R P Falcão
Monoclonal B-cell lymphocytosis (MBL) is an asymptomatic clinical entity characterized by the proliferation of monoclonal B cells not meeting the diagnosis criteria for chronic lymphocytic leukemia (CLL). MBL may precede the development of CLL, but the molecular mechanisms responsible for disease progression and evolution are not completely known. Telomeres are usually short in CLL and their attrition may contribute to disease evolution. Here, we determined the telomere lengths of CD5+CD19+ cells in MBL, CLL, and healthy volunteers...
April 13, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28421107/sexual-dimorphism-of-mirnas-secreted-by-bovine-in-vitro-produced-embryos
#20
Nicole Gross, Jenna Kropp, Hasan Khatib
Sexual dimorphism of bovine blastocysts has previously been observed through differences in development, cell death, metabolism, telomere length, DNA methylation, and transcriptomics. However, dimorphism in the secretion of miRNAs to culture media has not yet been evaluated. The objectives of this study were to determine if sex-specific blastocyst miRNA secretion occurs and to further investigate the role these miRNAs may have in the interaction between a blastocyst and the maternal environment. In vitro embryo culture was performed and media from male and female blastocysts was collected into sex-specific pools...
2017: Frontiers in Genetics
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