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telomere length

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https://www.readbyqxmd.com/read/28636942/extensive-proliferation-of-human-cancer-cells-with-ever-shorter-telomeres
#1
Rebecca A Dagg, Hilda A Pickett, Axel A Neumann, Christine E Napier, Jeremy D Henson, Erdahl T Teber, Jonathan W Arthur, C Patrick Reynolds, Jayne Murray, Michelle Haber, Alexander P Sobinoff, Loretta M S Lau, Roger R Reddel
Acquisition of replicative immortality is currently regarded as essential for malignant transformation. This is achieved by activating a telomere lengthening mechanism (TLM), either telomerase or alternative lengthening of telomeres, to counter normal telomere attrition. However, a substantial proportion of some cancer types, including glioblastomas, liposarcomas, retinoblastomas, and osteosarcomas, are reportedly TLM-negative. As serial samples of human tumors cannot usually be obtained to monitor telomere length changes, it has previously been impossible to determine whether tumors are truly TLM-deficient, there is a previously unrecognized TLM, or the assay results are false-negative...
June 20, 2017: Cell Reports
https://www.readbyqxmd.com/read/28636941/highly-aggressive-metastatic-melanoma-cells-unable-to-maintain-telomere-length
#2
Nikenza Viceconte, Marie-Sophie Dheur, Eva Majerova, Christophe E Pierreux, Jean-François Baurain, Nicolas van Baren, Anabelle Decottignies
Unlimited replicative potential is one of the hallmarks of cancer cells. In melanoma, hTERT (telomerase reverse transcriptase) is frequently overexpressed because of activating mutations in its promoter, suggesting that telomerase is necessary for melanoma development. We observed, however, that a subset of melanoma metastases and derived cell lines had no telomere maintenance mechanism. Early passages of the latter displayed long telomeres that progressively shortened and fused before cell death. We propose that, during melanoma formation, oncogenic mutations occur in precursor melanocytes with long telomeres, providing cells with sufficient replicative potential, thereby bypassing the need to re-activate telomerase...
June 20, 2017: Cell Reports
https://www.readbyqxmd.com/read/28636901/the-effect-of-cd34-cell-telomere-length-and-htert-expression-on-the-outcome-of-autologous-cd34-cell-transplantation-in-patients-with-chronic-heart-failure
#3
Jasmina-Ziva Rozman, Maja Pohar Perme, Mojca Jez, Elvira Malicev, Metka Krasna, Srdjan Novakovic, Bojan Vrtovec, Primoz Rozman
Age-related telomere attrition in stem/progenitor cells may diminish their functional capacity and thereby impair the outcome of cell-based therapies. The aim of the present study was to investigate the effect of CD34(+) cell telomere length and hTERT expression on the clinical outcome of autologous CD34(+) cell transplantation. We studied 43 patients with cardiomyopathy. Their peripheral blood CD34(+) cells were mobilized with granulocyte colony-stimulating factor, enriched by immunoselection and delivered transendocardially...
June 18, 2017: Mechanisms of Ageing and Development
https://www.readbyqxmd.com/read/28634877/socioeconomic-status-financial-strain-and-leukocyte-telomere-length-in-a-sample-of-african-american-midlife-men
#4
Joshua M Schrock, Nancy E Adler, Elissa S Epel, Amani M Nuru-Jeter, Jue Lin, Elizabeth H Blackburn, Robert Joseph Taylor, David H Chae
BACKGROUND: African American men in the USA experience poorer aging-related health outcomes compared to their White counterparts, partially due to socioeconomic disparities along racial lines. Greater exposure to socioeconomic strains among African American men may adversely impact health and aging at the cellular level, as indexed by shorter leukocyte telomere length (LTL). This study examined associations between socioeconomic factors and LTL among African American men in midlife, a life course stage when heterogeneity in both health and socioeconomic status are particularly pronounced...
June 20, 2017: Journal of Racial and Ethnic Health Disparities
https://www.readbyqxmd.com/read/28634520/effect-of-heartfulness-meditation-on-burnout-emotional-wellness-and-telomere-length-in-health-care-professionals
#5
Jayaram Thimmapuram, Robert Pargament, Kedesha Sibliss, Rodney Grim, Rosana Risques, Erik Toorens
Background: Burnout poses significant challenges during training years in residency and later in the career. Meditation is a tool to treat stress-related conditions and promote wellness. Telomere length may be affected by burnout and stress. However, the benefits of meditation have not been fully demonstrated in health care professionals. Objective: We assessed the effects of a 12-week 'Heartfulness Meditation' program on burnout, emotional wellness, and telomere length in residents, faculty members, and nurses at a large community teaching hospital during the 2015-16 academic year...
January 2017: Journal of Community Hospital Internal Medicine Perspectives
https://www.readbyqxmd.com/read/28630379/the-association-between-telomere-length-and-mortality-in-bangladesh
#6
Samantha G Dean, Chenan Zhang, Jianjun Gao, Shantanu Roy, Justin Shinkle, Mekala Sabarinathan, Maria Argos, Lin Tong, Alauddin Ahmed, Md Tariqul Islam, Tariqul Islam, Muhammad Rakibuz-Zaman, Golam Sarwar, Hasan Shahriar, Mahfuzar Rahman, Md Yunus, Joseph H Graziano, Lin S Chen, Farzana Jasmine, Muhammad G Kibriya, Habibul Ahsan, Brandon L Pierce
Telomeres are tandem repeat sequences at the end of chromosomes that bind proteins to protect chromosome ends. Telomeres shorten with age, and shorter leukocyte telomere length (TL) has been associated with overall mortality in numerous studies. However, this association has not been tested in populations outside of Europe and the U.S. We assessed the association between TL and subsequent mortality using data on 744 mortality cases and 761 age-/sex-matched controls sampled from >27,000 participants from three longitudinal Bangladeshi cohorts: Health Effects of Arsenic Longitudinal Study (HEALS), HEALS Expansion (HEALS-E), and Bangladesh Vitamin E and Selenium Trial (BEST)...
June 15, 2017: Aging
https://www.readbyqxmd.com/read/28630210/short-telomeres-but-not-telomere-attrition-rates-are-associated-with-carotid-atherosclerosis
#7
Simon Toupance, Carlos Labat, Mohamed Temmar, Patrick Rossignol, Masayuki Kimura, Abraham Aviv, Athanase Benetos
Short telomeres are associated with atherosclerosis. However, the temporal relationship between atherosclerosis and telomere length is unclear. The objective of this work was to examine the temporal formation and progression of carotid atherosclerotic plaques in relation to telomere dynamics. In a longitudinal study, comprising 154 French men and women (aged 31-76 years at baseline), carotid plaques were quantified by echography, and telomere length on leucocytes was measured by Southern blots at baseline and follow-up examinations...
June 19, 2017: Hypertension
https://www.readbyqxmd.com/read/28629117/alpha-and-gamma-tocopherol-and-telomere-length-in-5768-us-men-and-women-a-nhanes-study
#8
Larry A Tucker
Antioxidants have a number of potential health benefits. The present investigation was designed to determine the relationship between serum alpha- and gamma-tocopherol levels (powerful antioxidants), and leukocyte telomere length (a biomarker of biological aging). A cross-sectional design was employed to study 5768 adults from the National Health and Nutrition Examination Survey (NHANES). DNA was obtained via blood samples. Telomere length was assessed using the quantitative polymerase chain reaction method...
June 13, 2017: Nutrients
https://www.readbyqxmd.com/read/28628186/knockdown-of-homeobox-containing-1-increases-the-radiosensitivity-of-cervical-cancer-cells-through-telomere-shortening
#9
Shuliang Zhou, Youde Xiao, Yafei Zhuang, Yinyin Liu, Hong Zhao, Hui Yang, Conghua Xie, Fuxiang Zhou, Yunfeng Zhou
Homeobox containing 1 (HMBOX1) modulates telomere length in various types of tumor cells by binding to double‑stranded telomeric DNA. There is a negative correlation between telomere length and radiosensitivity in tumor cells. In the present study, we aimed to investigate the relationship among HMBOX1, telomere and radiosensitivity in cervical cancer cells. Lentivirus-based shRNAs were used to establish stable transfected cell lines in which protein and mRNA levels of HMBOX1 were notably decreased. Knockdown of HMBOX1 increased the radiosensitivity of HeLa and C33A cells...
July 2017: Oncology Reports
https://www.readbyqxmd.com/read/28628024/-evaluation-of-dynamic-telomere-length-shortening-of-lymphocytes-in-immunocompromised-children-with-chronic-diseases-of-the-respiratory
#10
E Khalturina, I Nesterova
Nowadays it is common to observe the growth of viral-viral and viral-bacterial co-infections in children of different ages, due to dysfunction of lymphocytes (DL), which can be connected with the process of the accelerated shortening of the end structures of chromosomal telomeres, telomere length changes are described in lymphocytes of children with chronic mono-infections. The conducted study has shown the shortening of telomere lymphocytes in children with CDRT seropositive for mixed-herpes viral infections (herpes simplex virus, virus, Epstein-Barr virus and cytomegalovirus in various combinations) and for bacterial co-infections - Chlamydia trachomatis and (or) Mycoplasma pneumoniae...
May 2017: Georgian Medical News
https://www.readbyqxmd.com/read/28623966/relative-amount-of-telomeric-sequences-in-terminal-villi-does-not-differ-between-normal-term-placentas-and-placentas-from-patients-with-well-controlled-type-1-diabetes-mellitus
#11
Alžběta Zinková, Dominika Marová, Júlia Koperdáková, Tomáš P Mirchi, Marie Korabečná, Marie Jirkovská
We applied qPCR to compare relative telomere length in terminal villi microdissected from term control placentas and placentas of patients suffering from type 1 diabetes. Significant differences were not found in the relative T/S ratios between placental groups or between the diabetic placentas affected and those not affected with chorangiosis. We hypothesize that there is no relationship between decreased placental proliferative ability in maternal diabetes type 1 and telomere shortening.
July 2017: Placenta
https://www.readbyqxmd.com/read/28622077/a-comparative-study-of-the-effects-of-sodium-selenite-and-glutathione-mono-ethyl-ester-on-aged-adipose-derived-stem-cells-the-telomerase-and-cellular-responses
#12
N Aminizadeh, Taki M Tiraihi, S A Mesbah-Namin, Taher Taheri
The proliferation and differentiation potential of adipose derived stem cells (ADSCs) declines with ageing. Moreover, Alzheimer's disease is associated with progressive decline in cholinergic neurons. The purpose of this study is to enhance the proliferation potential of aged rat ADSCs and their differentiation into cholinergic neurons. The ADSCs were collected from aged male rats cultured and treated with different concentrations of sodium selenite for 3 days or glutathione mono ethyl ester (GSH-MEE) for 1 day...
June 16, 2017: Rejuvenation Research
https://www.readbyqxmd.com/read/28621334/telomere-length-and-bipolar-disorder
#13
Timothy R Powell, Danai Dima, Sophia Frangou, Gerome Breen
Variation in telomere length is heritable and is currently considered a promising biomarker of susceptibility for neuropsychiatric disorders, particularly because of its association with memory function and hippocampal morphology. Here, we investigate telomere length in connection to familial risk and disease expression in bipolar disorder (BD). We used quantitative polymerase chain reactions and a telomere-sequence to single-copy-gene-sequence ratio method to determine telomere length in genomic DNA extracted from buccal smears from 63 patients with BD, 74 first-degree relatives (49 relatives had no lifetime psychopathology and 25 had a non-BD mood disorder) and 80 unrelated healthy individuals...
June 16, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28619828/the-association-of-telomere-length-in-peripheral-blood-cells-with-cancer-risk-a-systematic-review-and-meta-analysis-of-prospective-studies
#14
Xia Zhang, Qian Zhao, Wei Zhu, Tao Liu, Shao-Hua Xie, Li-Xin Zhong, Yuan-Yuan Cai, Xiao-Na Li, Mei Liang, Wen Chen, Qian-Sheng Hu, Bo Zhang
The association between telomere length (TL) in peripheral blood cells and cancer risk remains inconclusive. We carried out a meta-analysis on prospective studies. The study-specific relative risk estimates were first transformed to a common comparable scale and then were pooled by a random-effects model. The dataset was composed of 13894 cases and 71672 controls from 28 studies in 25 articles. In the comparison of the longest versus shortest third of TL, we observed a marginally positive association between longer TL and higher risk of total cancers (OR=1...
June 15, 2017: Cancer Epidemiology, Biomarkers & Prevention
https://www.readbyqxmd.com/read/28617662/telomere-length-and-accelerated-biological-aging-in-the-china-suboptimal-health-cohort-a-case-control-study
#15
Mohamed Ali Alzain, Collins Otieno Asweto, Jie Zhang, Honghong Fang, Zhongyao Zhao, Xiuhua Guo, Manshu Song, Yong Zhou, Naibai Chang, Youxin Wang, Wei Wang
Suboptimal health status (SHS) has been linked to cardiovascular risk factors, psychosocial stress, and unhealthy lifestyle. These factors also contribute to the shortening of telomere length (TL). A case-control study was conducted to examine the association between subjective health measures of SHS from the behavior perspective and also objective measures of TL at molecular level. SHS (cases = 294) was matched by age, sex, and body mass index with ideal health (controls = 294) using a propensity score matching method...
June 2017: Omics: a Journal of Integrative Biology
https://www.readbyqxmd.com/read/28615296/ancestry-telomere-length-and-atherosclerosis-risk
#16
REVIEW
Athanase Benetos, Abraham Aviv
No abstract text is available yet for this article.
June 2017: Circulation. Cardiovascular Genetics
https://www.readbyqxmd.com/read/28613367/-associations-between-depression-anxiety-and-telomere-length-in-a-large-dutch-psychiatric-cohort-study
#17
J E Verhoeven, P van Oppen, B W J H Penninx
Not only do depressive and anxiety disorders have psychological consequenses, they can also lead to impaired physical health. Persons with depressieve and anxiety disorders have increased risk of developing several ageing-related somatic ilnesses. This raises the question whether persons with depressive or anxiety disorder are subject to accelerated cellular ageing.<br/> AIM: To test the cross-sectional and longitudinal associations between depressive and anxiety disorders and telomere length, an indicator of cellular ageing...
2017: Tijdschrift Voor Psychiatrie
https://www.readbyqxmd.com/read/28611442/competing-factors-link-to-bone-health-in-polycystic-ovary-syndrome-chronic-low-grade-inflammation-takes-a-toll
#18
Shirin Kalyan, Millan S Patel, Elaine Kingwell, Hélène C F Côté, Danmei Liu, Jerilynn C Prior
Chronic inflammation predisposes to poor bone health. Women with polycystic ovary syndrome (PCOS) experience androgen excess, ovulatory disturbances, insulin resistance, abdominal adiposity and chronic inflammation. Our objective was to investigate the relationships among bone health parameters, chronic subclinical inflammation and anthropometric measures in premenopausal women with and without PCOS. In 61 premenopausal women, 22 women with PCOS and 39 controls, we assessed bone parameters (total hip bone mineral density [BMD] by dual-energy X-ray absorptiometry and radius strength-strain index [SSI] by peripheral quantitative computed tomography), inflammation (C-reactive protein/albumin), oxidative stress (leukocyte telomere length, urinary 8-hydroxydeoxyguanosine); hemoglobin A1c; anthropometric measures (body mass index, waist-to-height ratio, cross-sectional muscle area)...
June 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28609023/relations-of-sex-hormone-levels-to-leukocyte-telomere-length-in-black-hispanic-and-asian-pacific-islander-postmenopausal-women
#19
Yan Song, Michele Cho, Kathleen Brennan, Brian H Chen, Yiqing Song, JoAnn E Manson, Andrea L Hevener, Nai-Chieh Y You, Anthony W Butch, Simin Liu
BACKGROUND: Sex hormones may play important roles in sex-specific biological aging. We specifically examined the associations between circulating concentrations of sex hormones and leukocyte telomere length (TL). METHODS: We conducted a cross-sectional study of 1124 black, 444 Hispanic, and 289 Asian/Pacific Islander women in the Women's Health Initiative Observational Cohort. Concentrations of estradiol and testosterone were measured using electrochemiluminescence immunoassays...
June 13, 2017: Journal of Diabetes
https://www.readbyqxmd.com/read/28606800/physical-exercise-positively-influences-breast-cancer-evolution
#20
REVIEW
Kalliopi Adraskela, Eleftheria Veisaki, Michael Koutsilieris, Anastassios Philippou
Breast cancer is one of the most commonly diagnosed types of cancer in women. Its pathogenesis involves genetic, hormonal, and environmental factors. A large body of evidence indicates that physical activity has positive effects on every aspect of breast cancer evolution, including prevention, medical treatment, and aftercare clinical settings. Thus, different types of exercise can influence the prevention and progression of the disease through several common mechanisms, such as reduction of insulin resistance and improvement of immunity and cardiovascular function...
May 19, 2017: Clinical Breast Cancer
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