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https://www.readbyqxmd.com/read/28324503/visualization-of-human-telomerase-localization-by-fluorescence-microscopy-techniques
#1
Eladio Abreu, Rebecca M Terns, Michael P Terns
Human telomerase is a ribonucleoprotein (RNP) that synthesizes DNA repeats at the ends of chromosomes and maintains telomere length and genome stability. The enzyme is comprised of telomerase RNA (hTR) (which provides the template for telomere addition) and several protein subunits including telomerase reverse transcriptase (hTERT) (the catalytic component). Intracellular trafficking of the enzyme has emerged as an important factor in the regulation of telomerase activity. Telomerase trafficking between nuclear Cajal bodies (proposed sites of telomerase biogenesis and regulation) and telomeres (sites of action) is regulated by the cell cycle in concordance with telomere synthesis during S phase...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28291810/microrna-532-and-microrna-3064-inhibit-cell-proliferation-and-invasion-by-acting-as-direct-regulators-of-human-telomerase-reverse-transcriptase-in-ovarian-cancer
#2
Lin Bai, Hui Wang, Ai-Hua Wang, Luo-Ying Zhang, Jie Bai
Human telomerase reverse transcriptase (hTERT) plays a crucial role in ovarian cancer (OC) progression. However, the mechanisms underlying hTERT upregulation in OC, and the specific microRNAs (miRNAs) involved in the regulation of hTERT in OC cells, remains unclear. We performed a bioinformatics search to identify potential miRNAs that bind to the 3'-untranslated region (3'-UTR) region of the hTERT mRNA. We examined the expression levels of miR-532/miR-3064 in OC tissues and normal ovarian tissues, and analyzed the correlation between miRNA expression and OC patient outcomes...
2017: PloS One
https://www.readbyqxmd.com/read/28288903/silencing-of-htert-blocks-growth-and-migration-of-anaplastic-thyroid-cancer-cells
#3
Valentina Maggisano, Marilena Celano, Giovanni Enrico Lombardo, Saverio Massimo Lepore, Marialuisa Sponziello, Francesca Rosignolo, Antonella Verrienti, Federica Baldan, Efisio Puxeddu, Cosimo Durante, Sebastiano Filetti, Giuseppe Damante, Diego Russo, Stefania Bulotta
Mutations in the hTERT promoter responsible for constitutive telomerase activity are the most frequent genetic alteration detected in anaplastic thyroid cancer (ATC), and proposed as diagnostic and prognostic biomarker in these tumours. In this study we analyzed hTERT expression in a series of human ATCs and investigated the effects of small-interfering RNA-mediated silencing of hTERT on viability and migration and invasive properties of three human ATC cell lines. Expression of hTERT mRNA resulted increased in 8/10 ATCs compared to normal thyroid tissues...
March 10, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28279493/effect-of-melanoma-cells-on-proliferation-and-migration-of-activated-hepatic-stellate-cells-in-vitro
#4
Theresa Meyer, Andreas Koch, Eva-Vanessa Ebert, Barbara Czech, Martina Mueller, Anja Bosserhoff, Sven Arke Lang, Claus Hellerbrand
Melanoma is a highly aggressive tumor of the skin. The clinical outcome is determined by the presence or absence of metastases, and the liver is a common site of distant metastases. Hepatic metastasis is causing activation of hepatic stellate cells (HSC), which form the stroma of hepatic metastases and are increasingly recognized as a crucial component of the pro- metastatic liver microenvironment. Most studies have focused on the effects of HSC on (metastasizing) tumor cells. Here, we aimed to analyze functional in vitro effects of conditioned medium (CM) of twelve different human melanoma cell lines on LX2 cells and HSC(htert) cells, two well established human activated HSC cell lines...
December 26, 2016: Pathology, Research and Practice
https://www.readbyqxmd.com/read/28272339/alternative-splicing-of-htert-pre-mrna-a-potential-strategy-for-the-regulation-of-telomerase-activity
#5
REVIEW
Xuewen Liu, Yuchuan Wang, Guangming Chang, Feng Wang, Fei Wang, Xin Geng
The activation of telomerase is one of the key events in the malignant transition of cells, and the expression of human telomerase reverse transcriptase (hTERT) is indispensable in the process of activating telomerase. The pre-mRNA alternative splicing of hTERT at the post-transcriptional level is one of the mechanisms for the regulation of telomerase activity. Shifts in splicing patterns occur in the development, tumorigenesis, and response to diverse stimuli in a tissue-specific and cell type-specific manner...
March 7, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28270067/the-effects-of-nanoencapsulated-curcumin-fe3o4-on-proliferation-and-htert-gene-expression-in-lung-cancer-cells
#6
Hadi Sadeghzadeh, Younes Pilehvar-Soltanahmadi, Abolfazl Akbarzadeh, Hassan Dariushnejad, Forough Sanjarian, Nosratollah Zarghami
OBJECTIVE: The aim of the study is to fabricate curcumin-loaded PLGA-PEG-Fe3O4 nanoparticles and comprise the effects of pure curcumin and curcumin-nanomagnetic encapsulated in PLGA-PEG on cell cytotoxicity and hTERT gene expression in A549 lung cancer cell line. BACKGROUND: Lung cancer is the most common cancer in men and one of the four main cancers that occurs in women. Telomerase is active in more than 85% of various cancerous cells such as lung cancer while its activity is very low in normal cells...
February 13, 2017: Anti-cancer Agents in Medicinal Chemistry
https://www.readbyqxmd.com/read/28259895/quercetin-nanoparticles-display-antitumor-activity-via-proliferation-inhibition-and-apoptosis-induction-in-liver-cancer-cells
#7
Ke-Wei Ren, Ya-Hua Li, Gang Wu, Jian-Zhuang Ren, Hui-Bin Lu, Zong-Ming Li, Xin-Wei Han
Quercetin is a potent cancer therapeutic agent and dietary antioxidant present in fruit and vegetables. Quercetin prevents tumor proliferation by inducing cell cycle arrest and is a well known cancer therapeutic agent and autophagy mediator. Recent studies showed that drug delivery by nanoparticles have enhanced efficacy with reduced side effects. In this regard, gold-quercetin into poly(DL-lactide-co-glycolide) nanoparticles was examined. In this study, we explored the role and possible underlying mechanisms of quercetin nanoparticle in regulation of antitumor activity in liver cancer cells...
February 20, 2017: International Journal of Oncology
https://www.readbyqxmd.com/read/28259690/the-herbal-medicine-melissa-officinalis-extract-effects-on-gene-expression-of-p53-bcl-2-her2-vegf-a-and-htert-in-human-lung-breast-and-prostate-cancer-cell-lines
#8
Rana Jahanban-Esfahlan, Khaled Seidi, Amir Monfaredan, Vahid Shafie-Irannejad, Mehran Mesgari Abbasi, Ansar Karimian, Bahman Yousefi
INTRODUCTION: Earlier, we verified that Melissa officinalis extract (MOE) elicits potent antiproliferative effects on different human cancer cells. To gain insights into the molecular mechanisms accounting for the cytotoxic effects of MOE, we assessed the expression patterns of several prominent molecules with therapeutic potential in cancer by Quantitative PCR (Q-PCR). METHODS: A549, MCF-7 and PC3 cancer cells were grown in complete RPMI 1640 and seeded in 24 well micro plates...
March 1, 2017: Gene
https://www.readbyqxmd.com/read/28258039/kaempferol-increases-apoptosis-in-human-cervical-cancer-hela-cells-via-pi3k-akt-and-telomerase-pathways
#9
Elham Kashafi, Maliheh Moradzadeh, Ashraf Mohamadkhani, Saiedeh Erfanian
Cervical cancer is one of the most frequent cancers in women worldwide. Defects in the apoptotic pathways are responsible for both the disease pathogenesis and its therapy resistance. It is thus a good candidate for treatment by pro-apoptotic agents. Kaempferol as a flavonoid has antioxidant and anti-tumor properties. Kaempferol has been shown to induce apoptosis and cell death in cancer cells. However, due to the problems in the treatment of cervical cancer, this study is designed to investigate the molecular mechanism by which kaempferol suppresses the growth of cervical cancer HeLa cell as compared with HFF cells (normal cells)...
February 28, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28255170/nucleophosmin-interacts-with-pin2-terf1-interacting-telomerase-inhibitor-1-pinx1-and-attenuates-the-pinx1-inhibition-on-telomerase-activity
#10
Derek Hang-Cheong Cheung, Sai-Tim Ho, Kwok-Fai Lau, Rui Jin, Ya-Nan Wang, Hsiang-Fu Kung, Jun-Jian Huang, Pang-Chui Shaw
Telomerase activation and telomere maintenance are critical for cellular immortalization and transformation. PIN2/TERF1-interacting telomerase inhibitor 1 (PinX1) is a telomerase regulator and the aberrant expression of PinX1 causes telomere shortening. Identifying PinX1-interacting proteins is important for understanding telomere maintenance. We found that PinX1 directly interacts with nucleophosmin (NPM), a protein that has been shown to positively correlate with telomerase activity. We further showed that PinX1 acts as a linker in the association between NPM and hTERT, the catalytic subunit of telomerase...
March 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28251953/-suppression-of-telomerase-activity-leukemic-cells-by-mutant-forms-of-rhodospirillum-rubrum-l-asparaginase
#11
M V Pokrovskaya, D D Zhdanov, M A Eldarov, S S Aleksandrova, A V Veselovskiy, V S Pokrovskiy, D V Grishin, Ju A Gladilina, N N Sokolov
The active and stable mutant forms of short chain cytoplasmic L-asparaginase type I of Rhodospirillum rubrum (RrA): RrA+N17, D60K, F61L, RrA+N17, A64V, E67K, RrA+N17, E149R, V150P, RrAE149R, V150P and RrAE149R, V150P, F151T were obtained by the method of site-directed mutagenesis. It is established that variants RrA-N17, E149R, V150P, F151T and RrАE149R, V150P are capable to reduce an expression hTERT subunit of telomerase and, hence, activity of telomeres in Jurkat cells, but not in cellular lysates. During too time, L-asparaginases of Escherichia coli, Erwinia carotovora and Wolinella succinogenes, mutant forms RrА+N17, D60K, F61L and RrА+N17, A64V, E67K do not suppress of telomerase activity...
January 2017: Biomedit︠s︡inskai︠a︡ Khimii︠a︡
https://www.readbyqxmd.com/read/28251947/-cisplatin-induced-apoptotic-endonuclease-endog-inhibits-telomerase-activity-and-causes-malignant-transformation-of-human-cd4-t-lymphocytes
#12
D D Zhdanov, D А Vasina, E V Orlova, V S Orlova, V S Pokrovsky, M V Pokrovskaya, S S Aleksandrova, N N Sokolov
Alternative splicing of telomerase catalytic subunit hTERT pre-mRNA (human Telomerase Reverse Transcriptase) regulates telomerase activity. Increased expression of non-active splice variant hTERT results in inhibition of telomerase. Apoptotic endonuclease EndoG is known to participate in hTERT alternative splicing. Expression of EndoG can be induced in response to DNA damages. The aim of this study was to determine the ability of a DNA-damaging compound, cisplatin, to induce EndoG and its influence on alternative splicing of hTERT and telomerase activity in human CD4+ Т lymphocytes...
January 2017: Biomedit︠s︡inskai︠a︡ Khimii︠a︡
https://www.readbyqxmd.com/read/28247570/acidified-bile-acids-enhance-tumor-progression-and-telomerase-activity-of-gastric-cancer-in-mice-dependent-on-c-myc-expression
#13
Xiaolong Wang, Lei Sun, Xijing Wang, Huafeng Kang, Xiaobin Ma, Meng Wang, Shuai Lin, Meng Liu, Cong Dai, Zhijun Dai
c-Myc overexpression has been implicated in several malignancies including gastric cancer. Here, we report that acidified bile acids enhance tumor progression and telomerase activity in gastric cancer via c-Myc activation both in vivo and in vitro. c-Myc mRNA and protein levels were assessed in ten primary and five local recurrent gastric cancer samples by quantitative real-time polymerase chain reaction and western blotting analysis. The gastric cancer cell line MGC803 was exposed to bile salts (100 μmol/L glycochenodeoxycholic acid and deoxycholic acid) in an acid medium (pH 5...
March 1, 2017: Cancer Medicine
https://www.readbyqxmd.com/read/28225552/potential-clinical-significance-of-perioperative-levels-of-mrna-in-plasma-from-patients-with-cancer-of-the-larynx-or-hypopharynx
#14
Dolores C García-Olmo, J Diego Contreras, María G Picazo, Jesús López-Torres, Damián García-Olmo
BACKGROUND: The use of plasma as a "liquid biopsy" has gained increasing attention. The purpose of the present study was to evaluate the diagnostic and prognostic utility of the perioperative detection and quantitation of mRNAs encoding human telomerase reverse transcriptase (hTERT) and glyceraldehyde 3-phosphate dehydrogenase (GAPDH) in plasma from patients with cancer of the larynx or hypopharynx. METHODS: We recruited 47 patients with laryngeal cancer and 2 patients with hypopharyngeal cancer, plus 27 healthy subjects...
April 2017: Head & Neck
https://www.readbyqxmd.com/read/28218725/treating-cancer-by-targeting-telomeres-and-telomerase
#15
REVIEW
Marko Ivancich, Zachary Schrank, Luke Wojdyla, Brandon Leviskas, Adijan Kuckovic, Ankita Sanjali, Neelu Puri
Telomerase is expressed in more than 85% of cancer cells. Tumor cells with metastatic potential may have a high telomerase activity, allowing cells to escape from the inhibition of cell proliferation due to shortened telomeres. Human telomerase primarily consists of two main components: hTERT, a catalytic subunit, and hTR, an RNA template whose sequence is complimentary to the telomeric 5'-dTTAGGG-3' repeat. In humans, telomerase activity is typically restricted to renewing tissues, such as germ cells and stem cells, and is generally absent in normal cells...
February 19, 2017: Antioxidants (Basel, Switzerland)
https://www.readbyqxmd.com/read/28215740/inhibition-of-htert-expression-by-map-kinase-inhibitor-induces-cell-death-in-renal-cell-carcinoma
#16
Deeksha Pal, Ujjawal Sharma, Shrawan Kumar Singh, Nandita Kakkar, Rajendra Prasad
BACKGROUND: Human telomerase reverse transcriptase (hTERT) is one of the components of telomerase enzyme and its activity is associated with cell proliferation and differentiation. Extracellular signal regulated kinase (ERK)-mitogen activated protein kinase signaling pathway play an important role in hTERT expression. The present study was conducted to ascertain hTERT messenger RNA (mRNA) expression in renal cell carcinoma (RCC) and its association with clinicopathological characteristics...
February 16, 2017: Urologic Oncology
https://www.readbyqxmd.com/read/28212708/development-and-performance-evaluation-of-a-three-dimensional-clinostat-synchronized-heavy-ion-irradiation-system
#17
Hiroko Ikeda, Hikaru Souda, Anggraeini Puspitasari, Kathryn D Held, Jun Hidema, Takeshi Nikawa, Yukari Yoshida, Tatsuaki Kanai, Akihisa Takahashi
Outer space is an environment characterized by microgravity and space radiation, including high-energy charged particles. Astronauts are constantly exposed to both microgravity and radiation during long-term stays in space. However, many aspects of the biological effects of combined microgravity and space radiation remain unclear. We developed a new three-dimensional (3D) clinostat synchronized heavy-ion irradiation system for use in ground-based studies of the combined exposures. Our new system uses a particle accelerator and a respiratory gating system from heavy-ion radiotherapy to irradiate samples being rotated in the 3D clinostat with carbon-ion beams only when the samples are in the horizontal position...
February 2017: Life Sciences in Space Research
https://www.readbyqxmd.com/read/28209613/wnt-%C3%AE-catenin-directs-self-renewal-symmetric-cell-division-of-hterthigh-prostate-cancer-stem-cells
#18
Kai Zhang, Yanjing Guo, Xue Wang, Huifang Zhao, Zhongzhong Ji, Chaping Cheng, Li Li, Yuxiang Fang, Dawei Xu, Helen He Zhu, Wei-Qiang Gao
Cancer stem-like cells (CSC) drive cancer progression and recurrence. Self-renewal expansion of CSC is achieved through symmetric cell division, yet how external stimuli affect intracellular regulatory programs of CSC division modes and stemness remains obscure. Here we report that hTERThigh prostate cancer (PCa) cells exhibit CSC properties, including a stem cell-associated gene expression signature, long term tumor-propagating capacity and epithelial-to-mensenchymal transition (EMT). In promoting the self-renewal symmetric division of hTERThigh PCa cells, WNT3a dramatically decreased the ratio of hTERThigh PCa cells undergoing asymmetric division...
February 16, 2017: Cancer Research
https://www.readbyqxmd.com/read/28195144/concomitant-underexpression-of-tgfbr2-and-overexpression-of-htert-are-associated-with-poor-prognosis-in-cervical-cancer
#19
Hui Yang, Hongyan Zhang, Yahua Zhong, Qiaoli Wang, Lei Yang, Hong Kang, Xiaojia Gao, Haijun Yu, Conghua Xie, Fuxiang Zhou, Yunfeng Zhou
The human telomerase reverse transcriptase (hTERT) is highly expressed in a variety of tumors. The transforming growth factor beta receptor type II (TGFBR2) is a downstream protein of transforming growth factor beta (TGF-β) which suppresses telomerase activity. However, the relevance of survival to the expression of TGFBR2, hTERT or TGFBR2/hTERT has not been previously investigated in cervical cancer tissues. Our study showed that patients with low level of TGFBR2 were associated with poor prognosis (HR = 1...
February 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28179459/practical-method-for-targeted-disruption-of-cilia-related-genes-by-using-crispr-cas9-mediated-homology-independent-knock-in-system
#20
Yohei Katoh, Saki Michisaka, Shohei Nozaki, Teruki Funabashi, Tomoaki Hirano, Ryota Takei, Kazuhisa Nakayama
The CRISPR/Cas9 system has revolutionized genome editing in virtually all organisms. Although the CRISPR/Cas9 system enables the targeted cleavage of genomic DNA, its use for gene knock-in remains challenging because levels of homologous recombination activity vary among various cells. In contrast, the efficiency of homology-independent DNA repair is relatively high in most cell types. Therefore, the utilization of a homology-independent repair mechanism is a possible alternative for efficient genome editing...
February 8, 2017: Molecular Biology of the Cell
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