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telomere length

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https://www.readbyqxmd.com/read/29334159/a-gold-iii-pincer-ligand-scaffold-for-the-synthesis-of-binuclear-and-bioconjugated-complexes-synthesis-and-anticancer-potential
#1
Bertrand Benoît, Maria A O'Connell, Zöe A E Waller, Manfred Bochmann
Cyclometalated (C^N^C)Au(III) complexes bearing functionalized N-heterocyclic carbene (NHC) ligands provide a high-yielding, modular route to bioconjugated and binuclear complexes. That methodology has been applied to the synthesis of bioconjugated complexes presenting biotin and 17α-ethynylestradiol vectors, as well as to the synthesis of bimetallic Au(III)/Au(I) complexes. The in vitro antiproliferative activities of these compounds against various cancer cells lines depend on the linker length, with the longer linker being the most potent...
January 15, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29324774/activated-carbon-n-acetylcysteine-microcapsule-protects-against-nonalcoholic-fatty-liver-disease-in-young-rats-via-activating-telomerase-and-inhibiting-apoptosis
#2
Tingting Shi, Xingxin Yang, Hongping Zhou, Jianjun Xi, Jingjing Sun, Yunling Ke, Jiankang Zhang, Yidan Shao, Xiaojie Jiang, Xuwang Pan, Shourong Liu, Rangxiao Zhuang
Non-alcoholic fatty liver disease (NAFLD) is becoming one of the world's most common chronic liver diseases in childhood, yet no therapy is available that has been approved by the food and drug administration (FDA). Previous studies have reported that telomere and telomerase are involved the development and progression of NAFLD. This study was designed to investigate the potential beneficial effects of activated carbon N-acetylcysteine (ACNAC) microcapsules on the development of NAFLD in young rats as well as the underlying mechanism(s) involved...
2018: PloS One
https://www.readbyqxmd.com/read/29322876/study-of-telomere-length-in-preimplanted-cultured-chondrocytes
#3
Juan Manuel López-Alcorocho, Isabel Guillén-Vicente, Elena Rodríguez-Iñigo, Marta Guillén-Vicente, Tomás Fernando Fernández-Jaén, Rosa Caballero, Mercedes Casqueiro, Pilar Najarro, Steve Abelow, Pedro Guillén-García
Design In the process of cell division, the extremes of the eukaryotic chromosomes are progressively shortening, and this phenomenon is related to cell degeneration and senescence. The treatment of cartilage lesions with autologous chondrocytes implies that cells proliferate in an artificial environment. We have studied the viability of cultured chondrocytes after measurement of their telomere length before implantation. Methods Articular cartilage biopsies (B1, B2, and B3) were obtained from 3 patients (2 males and 1 female) with knee cartilage defects, who were going to be treated with chondrocyte implantation...
January 1, 2018: Cartilage
https://www.readbyqxmd.com/read/29321622/evaluation-of-a-developmental-hierarchy-for-breast-cancer-cells-to-assess-risk-based-patient-selection-for-targeted-treatment
#4
Sarah A Bliss, Sunirmal Paul, Piotr W Pobiarzyn, Seda Ayer, Garima Sinha, Saumya Pant, Holly Hilton, Neha Sharma, Maria F Cunha, Daniel J Engelberth, Steven J Greco, Margarette Bryan, Magdalena J Kucia, Sham S Kakar, Mariusz Z Ratajczak, Pranela Rameshwar
This study proposes that a novel developmental hierarchy of breast cancer (BC) cells (BCCs) could predict treatment response and outcome. The continued challenge to treat BC requires stratification of BCCs into distinct subsets. This would provide insights on how BCCs evade treatment and adapt dormancy for decades. We selected three subsets, based on the relative expression of octamer-binding transcription factor 4 A (Oct4A) and then analysed each with Affymetrix gene chip. Oct4A is a stem cell gene and would separate subsets based on maturation...
January 10, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29321040/automated-image-analysis-detects-aging-in-clinical-grade-mesenchymal-stromal-cell-cultures
#5
S Oja, P Komulainen, A Penttilä, J Nystedt, M Korhonen
BACKGROUND: Senescent cells are undesirable in cell therapy products due to reduced therapeutic activity and risk of aberrant cellular effects, and methods for assessing senescence are needed. Early-passage mesenchymal stromal cells (MSCs) are known to be small and spindle-shaped but become enlarged upon cell aging. Indeed, cell morphology is routinely evaluated during MSC production using subjective methods. We have therefore explored the possibility of utilizing automated imaging-based analysis of cell morphology in clinical cell manufacturing...
January 10, 2018: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/29320491/cdc73-suppresses-genome-instability-by-mediating-telomere-homeostasis
#6
Rahul V Nene, Christopher D Putnam, Bin-Zhong Li, Katarina G Nguyen, Anjana Srivatsan, Christopher S Campbell, Arshad Desai, Richard D Kolodner
Defects in the genes encoding the Paf1 complex can cause increased genome instability. Loss of Paf1, Cdc73, and, Ctr9, but not Rtf1 or Leo1, caused increased accumulation of gross chromosomal rearrangements (GCRs). Combining the cdc73Δ mutation with individual deletions of 43 other genes, including TEL1 and YKU80, which are involved in telomere maintenance, resulted in synergistic increases in GCR rates. Whole genome sequence analysis of GCRs indicated that there were reduced relative rates of GCRs mediated by de novo telomere additions and increased rates of translocations and inverted duplications in cdc73Δ single and double mutants...
January 10, 2018: PLoS Genetics
https://www.readbyqxmd.com/read/29318605/leukocyte-telomere-length-in-relation-to-risk-of-lung-adenocarcinoma-incidence-findings-from-the-singapore-chinese-health-study
#7
Jian-Min Yuan, Kenneth B Beckman, Renwei Wang, Caroline Bull, Jennifer Adams-Haduch, Joyce Y Huang, Aizhen Jin, Patricia Opresko, Anne B Newman, Yun-Ling Zheng, Michael Fenech, Woon-Puay Koh
Telomeres are crucial in the maintenance of chromosome integrity and genomic stability. Critically short telomeres can trigger programmed cell death while cells with longer telomeres may have increased likelihood of replicative errors, resulting in genetic mutations and chromosomal alterations, and ultimately promoting oncogenesis. Data on telomere length and lung cancer risk from large prospective cohort studies are spare. Relative telomere length in peripheral blood leukocytes was quantified using a validated monochrome multiplex quantitative polymerase chain reaction (qPCR) method in 26,540 participants of the Singapore Chinese Health Study...
January 10, 2018: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/29299784/religiosity-and-telomere-length-in-colorectal-cancer-patients-in-saudi-arabia
#8
Mahmoud Shaheen Al Ahwal, Faten Al Zaben, Mohammad Gamal Sehlo, Doaa Ahmed Khalifa, Harold G Koenig
Numerous studies have reported a significant relationship between psychological stress, depression, and telomere length (TL), an indicator of cellular lifespan. Religious involvement, which is associated with lower levels of stress and depression, has also recently been related to TL. To our knowledge, this relationship has not yet been examined in Muslims, colorectal cancer patients, cancer patients more generally, or any population outside the USA. A convenience sample of 50 colorectal patients was recruited from hospital-based oncology clinics in Jeddah, Saudi Arabia...
January 3, 2018: Journal of Religion and Health
https://www.readbyqxmd.com/read/29296896/maintenance-of-telomere-length-in-aml
#9
REVIEW
Peter M Lansdorp
The importance of telomere length to human health, aging, and cancer continues to be underappreciated. This review examines some basics of telomere biology and relates how telomere function, telomerase activity, and mutations in TERC or TERT are involved in bone marrow failure, leukemias, and other cancers. Given the challenge to obtain accurate data on telomerase activity and telomere length in specific cell types, the situation in acute myeloid leukemia (AML) remains puzzling. In most cancers, telomerase levels are increased after cells have encountered a "telomere crisis," which is typically associated with poor prognosis...
November 28, 2017: Blood Advances
https://www.readbyqxmd.com/read/29296781/clinical-profile-biological-markers-and-comorbidity-index-as-predictors-of-transplant-related-mortality-after-allo-hsct
#10
Aliénor Xhaard, Renato Cunha, Marc Busson, Marie Robin, Nathalie Dhedin, Tereza Coman, Aurélie Cabannes-Hamy, Flore Sicre de Fontbrune, David Michonneau, Gérard Socié, Rodrigo T Calado, Régis Peffault de Latour
Various pretransplant patient and disease characteristics are associated with treatment-related mortality (TRM) after allogeneic hematopoietic stem cell transplantation (allo-HSCT). However, TRM cannot yet be satisfactorily predicted. We prospectively investigated the aggregate impact of pretransplant clinical variables (period, donor/recipient age, gender, cytomegalovirus status, disease risk, stem cell source, and HLA matching), comorbidity index scores (Hematopoietic Cell Transplantation Comorbidity Index), and biological markers (telomere length, ferritin, and C-reactive protein) on TRM in single-center patients receiving a first allo-HSCT...
August 8, 2017: Blood Advances
https://www.readbyqxmd.com/read/29290038/tight-co-twin-similarity-of-monozygotic-twins-for-htert-protein-level-of-t-cell-subsets-for-telomere-length-and-mitochondrial-dna-copy-number-but-not-for-telomerase-activity
#11
Dóra Melicher, Anett Illés, Éva Pállinger, Árpád Ferenc Kovács, Levente Littvay, Ádám Domonkos Tárnoki, Dávid László Tárnoki, András Bikov, Mária Judit Molnár, Edit Irén Buzás, András Falus
Our study analyzed lymphocyte subpopulations of 32 monozygotic twins and compared the level of the catalytic reverse transcriptase protein subunit (hTERT) in T lymphocytes (Tly), helper- (Th), cytotoxic- (Tc) and regulatory T cell (Treg) subgroups. Four variables related to telomere and mitochondrial biology were simultaneously assessed, applying multi-parametric flow cytometry, TRAP-ELISA assay and qPCR standard curve method on peripheral blood mononuclear cell (PBMC) samples of genetically matched individuals...
December 30, 2017: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/29288666/zeb1-stimulates-breast-cancer-growth-by-up-regulating-htert-expression
#12
Pan Yu, Xi Shen, Wen Yang, Yunke Zhang, Chunping Liu, Tao Huang
Dysfunctional cell proliferation and death are the foundation of the malignant biological characteristics of cancers. In this study, we discovered that ZEB1 was positively correlated with hTERT in breast invasive ductal carcinoma samples at both the mRNA and protein levels. Further, our in vitro study in breast cancer cell lines confirmed that ZEB1 regulates hTERT expression at the mRNA and protein levels; thus, hTERT promotes or inhibits telomerase activity, and telomere length is either protected or reduced...
December 27, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29286521/impact-of-chronic-blood-viral-infection-on-lymphocyte-telomere-length-in-chornobyl-clean-up-workers-in-a-remote-period-after-radiation-exposure
#13
I M Ilienko, O V Lyaskivska, O A Belayev, O Y Pleskach, V I Shinkarenko, D A Bazyka
OBJECTIVE: To assess whether telomere length in lymphocytes of Chornobyl clean up workers at a late period 30 years after the exposure to ionizing radiation is influenced by a chronic blood viral infection and to determine role of viral carriage in cellular senescence. PATIENTS AND METHODS: Study group included 70 Chornobyl cleanup male workers 30 years after exposure {doses of external exposure (602.67 ± 114.19) mSv (M ± m); age (59.75 ± 0.82) yrs}. Relative telomere length (RTL) was analysed by fluorescence in situ hybridization and flow cytometry, immune cell subsets by standard combinations of monoclonal antibodies (CD45/14, CD3/19, CD4/8, CD3/HLADR, CD3/16/56, TCRγδ) and flow cytometry; antiviral immunity was performed determining the chronic phase antibodies to viruses: Hepatitis C (HCV), Cytomegalovirus (CMV), Toxoplasma gondii (TOX), Herpes simplex (HSV) and Epstein Barr virus (EBV VCA IgG and EBV NA IgG)...
December 2017: Problemy Radiat︠s︡iĭnoï Medyt︠s︡yny Ta Radiobiolohiï
https://www.readbyqxmd.com/read/29285302/telomere-length-associated-with-the-risks-of-high-risk-and-ischemic-stroke-in-southern-chinese-han-population
#14
Dong Luo, Qun Hou, Jianzhong Yu, Dan Yu
Some previous studies suggested telomere length was associated with the risk of ischemic stroke (IS). The aim of this study was to further confirm the association between relative telomere length (RTL) and risk of IS and to especially explore its correlation with the risk of high-risk stroke population in southern Chinese Han. RTL was determined by using real-time quantitative polymerase chain reaction from 400 ischemic stroke patients, 409 high-risk stroke populations and 399 healthy controls. The correlations between the controls and the risk of high-risk and ischemic stroke were evaluated by using an unconditional logistic regression...
December 1, 2017: Oncotarget
https://www.readbyqxmd.com/read/29285197/correlation-of-telomere-length-to-malignancy-potential-in-non-melanoma-skin-cancers
#15
Hanae Yamada-Hishida, Yoshimasa Nobeyama, Hidemi Nakagawa
Telomeres are associated with cell fate and aging through their role in the cellular response to stress and growth stimulation resulting from previous cell divisions and DNA damage. Telomere shortening has been observed in most human cancers, and is known to be a feature of malignancy. The aim of this study is to clarify whether telomere length is related to the malignant potential of non-melanoma skin cancers. Telomere length was analyzed using tissue quantitative fluorescence in situ hybridization in 36 non-melanoma skin cancers including basal cell carcinoma (BCC), squamous cell carcinoma (SCC), Bowen's disease (BD) and actinic keratosis (AK), and also in 26 samples of normal-appearing epidermal tissue surrounding or located close to each tumor...
January 2018: Oncology Letters
https://www.readbyqxmd.com/read/29283388/evolutionary-dynamics-of-the-w-chromosome-in-caenophidian-snakes
#16
Barbora Augstenová, Sofia Mazzoleni, Lukáš Kratochvíl, Michail Rovatsos
The caenophidian (assigned also as "advanced") snakes are traditionally viewed as a group of reptiles with a limited karyotypic variation and stable ZZ/ZW sex chromosomes. The W chromosomes of the caenophidian snakes are heterochromatic, and pioneering studies demonstrated that they are rich in repetitive elements. However, a comparative study of the evolutionary dynamics of the repetitive content of the W chromosome across the whole lineage is missing. Using molecular-cytogenetic techniques, we explored the distribution of four repetitive motifs (microsatellites GATA, GACA, AG and telomeric-like sequences), which are frequently accumulated in differentiated sex chromosomes in vertebrates, in the genomes of 13 species of the caenophidian snakes covering a wide phylogenetic spectrum of the lineage...
December 28, 2017: Genes
https://www.readbyqxmd.com/read/29281671/short-telomere-length-in-ipf-lung-associates-with-fibrotic-lesions-and-predicts-survival
#17
Reinier Snetselaar, Aernoud A van Batenburg, Matthijs F M van Oosterhout, Karin M Kazemier, Suzan M Roothaan, Ton Peeters, Joanne J van der Vis, Roel Goldschmeding, Jan C Grutters, Coline H M van Moorsel
Telomere maintenance dysfunction has been implicated in the pathogenesis of Idiopathic Pulmonary Fibrosis (IPF). However, the mechanism of how telomere length is related to fibrosis in the lungs is unknown. Surgical lung biopsies of IPF patients typically show a heterogeneous pattern of non-fibrotic and fibrotic areas. Therefore, telomere length (TL) in both lung areas of patients with IPF and familial interstitial pneumonia was compared, specifically in alveolar type 2 (AT2) cells. Fluorescent in situ hybridization was used to determine TL in non-fibrotic and fibrotic areas of 35 subjects...
2017: PloS One
https://www.readbyqxmd.com/read/29274177/links-between-parental-life-histories-of-wild-salmon-and-the-telomere-lengths-of-their-offspring
#18
D McLennan, J D Armstrong, D C Stewart, S Mckelvey, W Boner, P Monaghan, N B Metcalfe
The importance of parental contributions to offspring development and subsequent performance is self-evident at a genomic level; however, parents can also affect offspring fitness by indirect genetic and environmental routes. The life history strategy that an individual adopts will be influenced by both genes and environment; and this may have important consequences for offspring. Recent research has linked telomere dynamics (i.e. telomere length and loss) in early life to future viability and longevity. Moreover, a number of studies have reported a heritable component to telomere length across a range of vertebrates, though the effects of other parental contribution pathways have been far less studied...
December 23, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/29250704/telomere-chromatin-establishment-and-its-maintenance-during-mammalian-development
#19
REVIEW
Mathieu Tardat, Jérôme Déjardin
Telomeres are specialized structures that evolved to protect the end of linear chromosomes from the action of the cell DNA damage machinery. They are composed of tandem arrays of repeated DNA sequences with a specific heterochromatic organization. The length of telomeric repeats is dynamically regulated and can be affected by changes in the telomere chromatin structure. When telomeres are not properly controlled, the resulting chromosomal alterations can induce genomic instability and ultimately the development of human diseases, such as cancer...
December 18, 2017: Chromosoma
https://www.readbyqxmd.com/read/29243174/prion-propagation-and-inositol-polyphosphates
#20
REVIEW
Reed B Wickner, Herman K Edskes, Evgeny E Bezsonov, Moonil Son, Mathieu Ducatez
The [PSI+] prion is a folded in-register parallel β-sheet amyloid (filamentous polymer) of Sup35p, a subunit of the translation termination factor. Our searches for anti-prion systems led to our finding that certain soluble inositol polyphosphates (IPs) are important for the propagation of the [PSI+] prion. The IPs affect a wide range of processes, including mRNA export, telomere length, phosphate and polyphosphate metabolism, energy regulation, transcription and translation. We found that 5-diphosphoinositol tetra(or penta)kisphosphate or inositol hexakisphosphate could support [PSI+] prion propagation, and 1-diphosphoinositol pentakisphosphate appears to inhibit the process...
December 14, 2017: Current Genetics
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