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https://www.readbyqxmd.com/read/27905300/intravital-imaging-of-mouse-urothelium-reveals-activation-of-extracellular-signal-regulated-kinase-by-stretch-induced-intravesical-release-of-atp
#1
Takeshi Sano, Takashi Kobayashi, Hiromitsu Negoro, Atsushi Sengiku, Takuya Hiratsuka, Yuji Kamioka, Louis S Liou, Osamu Ogawa, Michiyuki Matsuda
To better understand the roles played by signaling molecules in the bladder, we established a protocol of intravital imaging of the bladder of mice expressing a Förster/fluorescence resonance energy transfer (FRET) biosensor for extracellular signal-regulated kinase (ERK), which plays critical roles not only in cell growth but also stress responses. With an upright two-photon excitation microscope and a vacuum-stabilized imaging window, cellular ERK activity was visualized in the whole bladder wall, from adventitia to urothelium...
November 2016: Physiological Reports
https://www.readbyqxmd.com/read/27903649/structural-mechanism-underpinning-cross-reactivity-of-a-cd8-t-cell-clone-that-recognises-a-peptide-derived-from-human-telomerase-reverse-transcriptase
#2
David K Cole, Hugo A van den Berg, Angharad Lloyd, Michael D Crowther, Konrad Beck, Julia Ekeruche-Makinde, John J Miles, Anna M Bulek, Garry Dolton, Andrea J Schauenburg, Aaron Wall, Anna Fuller, Mathew Clement, Bruno Laugel, Pierre J Rizkallah, Linda Wooldridge, Andrew K Sewell
T-cell cross-reactivity is essential for effective immune surveillance, but has also been implicated as a pathway to autoimmunity. Previous studies have demonstrated that T-cell receptors (TCRs) that focus on a minimal motif within the peptide are able to facilitate a high level of T-cell cross-reactivity. However, the structural database shows that most TCRs exhibit less focussed antigen binding involving contact with more peptide residues. To further explore the structural features that allow the clonally expressed TCR to functionally engage with multiple peptide-major histocompatibility complexes (pMHCs), we examined the ILA1 CD8+ T-cell clone that responds to a peptide sequence derived from human telomerase reverse transcriptase (hTERT)...
November 30, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27901163/synthesis-and-biological-evaluation-of-simplified-pironetin-analogues-with-modifications-in-the-side-chain-and-the-lactone-ring
#3
Steven Roldán, Adrià Cardona, Laura Conesa, Juan Murga, Eva Falomir, Miguel Carda, J Alberto Marco
The preparation of several new analogues of the natural dihydropyrone pironetin is described. They differ from the natural product mainly in the nature of the side chain and the lactone ring. Their cytotoxic activity has been measured. In addition, their interaction with tubulin, their ability to inhibit the secretion of the vascular endothelial growth factor (VEGF) and the expression of angiogenesis and telomerase-related genes have been determined. Unexpectedly, and unlike pironetin, the lactones studied in this work do not interact with tubulin...
November 30, 2016: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/27900047/microrna-138-inhibits-proliferation-migration-and-invasion-through-targeting-htert-in-cervical-cancer
#4
Na Zhou, Dan Fei, Shan Zong, Mingyue Zhang, Ying Yue
A growing body of evidence suggests that microRNA-138 (miR-138) functions as a tumor suppressor, and is involved in tumor initiation, development and metastasis in certain types of human cancers. However, the function and underlying molecular mechanism of miR-138 in cervical cancer remains unclear. Therefore, the purpose of the present study was to investigate the clinical significance of miR-138 expression in cervical cancer, and to evaluate its role and underlying mechanisms in cervical cancer. The present study indicated that miR-138 expression was significantly downregulated in cervical cancer tissues and cell lines, and that the low miR-138 expression was negatively associated with advanced FIGO stage and lymph node metastasis (P<0...
November 2016: Oncology Letters
https://www.readbyqxmd.com/read/27893208/enterolactone-reduces-telomerase-activity-and-levels-of-its-catalytic-subunit-in-breast-cancer-cells
#5
Davod Ilbeigi, Mitra Nourbakhsh, Shahnaz Khaghani, Nahid Einollahi, Nejat kheiripour, Zafar Gholinejad, Mohammad Alaee, Mostafa saberian
Background: Dietary consumption of phytoestrogens including lignans are linked to a lower incidence of breast cancer. Since activation of telomerase is crucial for growth of cancer cells, the aim of this study was to examine the effect of enterolactone (ENL) and enterodiol (END) on this enzyme. Methods: MTT assays were performed to determine the effect of different concentrations of ENL and ENL on cell viability and to determine the effective concentrations of these two compounds for inhibition of cell growth...
January 10, 2016: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/27882060/simple-and-reliable-method-to-quantify-the-hepatitis-b-viral-load-and-replicative-capacity-in-liver-tissue-and-blood-leukocytes
#6
Claudia Minosse, Sabrina Coen, Ubaldo Visco Comandini, Raffaella Lionetti, Marzia Montalbano, Stefano Cerilli, Donatella Vincenti, Andrea Baiocchini, Maria R Capobianchi, Stefano Menzo
BACKGROUND: A functional cure of chronic hepatitis B (CHB) is feasible, but a clear view of the intrahepatic viral dynamics in each patient is needed. Intrahepatic covalently closed circular DNA (cccDNA) is the stable form of the viral genome in infected cells, and represents the ideal marker of parenchymal colonization. Its relationships with easily accessible peripheral parameters need to be elucidated in order to avoid invasive procedures in patients. OBJECTIVES: The goal of this study was to design, set up, and validate a reliable and straightforward method for the quantification of the cccDNA and total DNA of the hepatitis B virus (HBV) in a variety of clinical samples...
October 2016: Hepatitis Monthly
https://www.readbyqxmd.com/read/27878302/triptolide-inhibits-tumor-growth-by-induction-of-cellular-senescence
#7
Ruidong Li, Xiaofei Zhang, Xiaoying Tian, Conghuan Shen, Quanbao Zhang, Yihong Zhang, Zhengxin Wang, Feifei Wang, Yifeng Tao
Cellular senescence, an irreversible growth arrest of cells, is involved in protection against cancer. Triptolide (TPL) plays an important role in immunosuppressive, anti-fertility, anti-cystogenesis and anticancer activities. However, effect and mechanism of TPL on cellular senescence-associated antitumor is rarely reported. Herein HepG2 cells were used to explore the effect of TPL on tumor growth and cellular senescence. We showed that TPL inhibited tumor cell proliferation and growth in vitro and in vivo, accelerated cellular senescence and arrested cells at G0/G1 phase...
November 18, 2016: Oncology Reports
https://www.readbyqxmd.com/read/27874963/study-on-the-functions-and-mechanism-of-immune-functions-of-human-telomerase-reverse-transcriptase-regulating-dendritic-cells-treating-sepsis
#8
H-M Chen, L-Q Wang, H-P Wan, H-Z Wei, L-C Ke, C-Y Liu, Q-Y Tan
OBJECTIVE: We analyzed the functions and mechanisms of immune functions of human telomerase reverse transcriptase regulating dendritic cells (DC) treating sepsis of mice models. MATERIALS AND METHODS: Eighty clean grade Balb/c animals aged from 6 to 8 weeks, weighted from 18 g to 22 g were selected for this study. The DC cells were harvested from the animals and cultivated to transfect with the recombinant eukaryotic expression plasmid hTERT-IRES2-EGFP construct...
November 2016: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/27873219/immortalization-of-primary-microglia-a-new-platform-to-study-hiv-regulation-in-the-central-nervous-system
#9
Yoelvis Garcia-Mesa, Taylor R Jay, Mary Ann Checkley, Benjamin Luttge, Curtis Dobrowolski, Saba Valadkhan, Gary E Landreth, Jonathan Karn, David Alvarez-Carbonell
The major reservoirs for HIV in the CNS are in the microglia, perivascular macrophages, and to a lesser extent, astrocytes. To study the molecular events controlling HIV expression in the microglia, we developed a reliable and robust method to immortalize microglial cells from primary glia from fresh CNS tissues and commercially available frozen glial cells. Primary human cells, including cells obtained from adult brain tissue, were transformed with lentiviral vectors expressing SV40 T antigen or a combination of SVR40 T antigen and hTERT...
November 21, 2016: Journal of Neurovirology
https://www.readbyqxmd.com/read/27868311/tnf-%C3%AE-induced-il-6-and-mmp-9-expression-in-immortalized-ameloblastoma-cell-line-established-by-htert
#10
K Ohta, T Naruse, Y Ishida, H Shigeishi, T Nakagawa, A Fukui, H Nishi, K Sasaki, I Ogawa, M Takechi
OBJECTIVE: Ameloblastoma (AM) shows locally invasive behaviour. However, biological investigations regarding regulation of gene expression associated with AM pathological features are difficult to perform, because AM cells can be passaged for a few generations due to senescence. We report a newly established immortalized AM cell line, AMB cells, by transfection with human telomerase reverse transcriptase (hTERT). Furthermore, we examined whether TNF-α modulates bone resorption-related genes, IL-6 and MMP-9 in cooperation with TGF-β or IFN-γ...
October 13, 2016: Oral Diseases
https://www.readbyqxmd.com/read/27868276/platelets-are-a-possible-regulator-of-human-endometrial-re-epithelialization-during-menstruation
#11
Koh Suginami, Yukiyasu Sato, Akihito Horie, Hisanori Matsumoto, Satoru Kyo, Yoshihiko Araki, Ikuo Konishi, Hiroshi Fujiwara
PROBLEM: The human endometrium periodically breaks down and regenerates. As platelets have been reported to contribute to the tissue remodeling process, we examined the possible involvement of platelets in endometrial regeneration. METHOD OF STUDY: The distribution of extravasating platelets throughout the menstrual cycle was immunohistochemically examined using human endometrial tissues. EM-E6/E7/hTERT cells, a human endometrial epithelial cell-derived immortalized cell line, were co-cultured with platelets, and the effects of platelets on the epithelialization response of EM-E6/E7/hTERT cells were investigated by attachment and permeability assays, immunohistochemical staining, and Western blot analysis...
November 21, 2016: American Journal of Reproductive Immunology: AJRI
https://www.readbyqxmd.com/read/27865417/knock-down-of-apoptosis-inducing-factor-gene-protects-endoplasmic-reticulum-stress-mediated-goat-granulosa-cell-apoptosis
#12
Diqi Yang, Tingting Jiang, Pengfei Lin, Huatao Chen, Lei Wang, Nan Wang, Fan Zhao, Aihua Wang, Yaping Jin
The apoptosis of granulosa cells is the main cause of follicular atresia, and endoplasmic reticulum (ER) stress is involved in the apoptosis of granulosa cells. Apoptosis inducing factor (AIF) mediates caspase-independent apoptosis and causes chromatin condensation and DNA fragmentation, but its role in ER stress-mediated granulosa cell apoptosis during goat follicular atresia remains largely unknown. The aim of this study was to investigate the function of AIF in the apoptosis of goat granulosa cells mediated by ER stress...
January 15, 2017: Theriogenology
https://www.readbyqxmd.com/read/27863966/activation-of-telomerase-by-hpvs
#13
REVIEW
Rachel A Katzenellenbogen
Telomerase extends the ends of linear chromosomes, and its expression leads to cellular immortalization. In HPV-associated cancers, telomerase is universally detected, and this occurs by activation of the catalytic subunit of telomerase, hTERT. The expression of hTERT is affected by both high-risk HPV E6 and E7. Seminal studies over the last two decades have identified the transcriptional, epigenetic, and post-transcriptional roles high-risk E6 and E7 have in telomerase regulation. This review will summarize these findings and highlight the importance of telomerase activation as an oncogenic pathway in HPV-associated cancer development and progression...
November 15, 2016: Virus Research
https://www.readbyqxmd.com/read/27861885/sensitivity-of-tp53-mutated-cancer-cells-to-the-phytoestrogen-genistein-is-associated-with-direct-inhibition-of-plk1-activity
#14
Sol-Bi Shin, Sang-Uk Woo, Young Won Chin, Young-Joo Jang, Hyungshin Yim
Polo-like kinase 1 (Plk1), a conserved Ser/Thr mitotic kinase, has been identified as a promising target for anticancer drug development because its overexpression is correlated with malignancy. Here, we found that genistein, an isoflavone, inhibits Plk1 kinase activity directly. Previously the mitotic disturbance phenomenon induced by treatment with genistein was not fully explained by its inhibitory effect on EGFR. In kinase profiling assays, it showed selectivity relative to a panel of kinases, including EGFR...
November 9, 2016: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/27847208/synthesis-and-characterization-of-chrysin-loaded-pcl-peg-pcl-nanoparticle-and-its-effect-on-breast-cancer-cell-line
#15
Ali Eatemadi, Hadis Daraee, Hammed T Aiyelabegan, Babak Negahdari, Bahram Rajeian, Nosratollah Zarghami
BACKGROUND: Nano-therapy exhibit the potential of revolutionizing cancer therapy. This field introduces nanovectors/nanocarriers for anticancer drugs targeted delivery, and also finds application in imaging. Chrysin, a natural flavonoid, was recently studied as having important biological roles in chemical defenses, nitrogen fixation, anti-inflammatory, and anti-oxidant properties. We aim at studying the effect of nano-chrysin on breast cancer cell line. METHODS: The effect of chrysin loaded PCL-PEG-PCL was studied on T47D breast cancer cell line...
November 12, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/27834948/the-antitumor-efficacy-of-anti-p21ras-scfv-mediated-by-the-dual-promoter-regulated-recombinant-adenovirus-kghv300
#16
X Pan, X Liu, J Li, S Zhen, D Liu, Q Feng, W Zhao, Y Luo, Y Zhang, H Li, J Yang
Ras mutations and overexpression of the Ras protein; i.e., p21Ras, are main causes of cancer development and progression, which has made the Ras gene and p21Ras important targets for therapy of Ras-driven cancers. We previously prepared recombinant adenovirus KGHV100 based on replication-defective adenovirus type 5, which could intracellularly express anti-p21Ras single chain fragment viable antibodies (scFv) and repress tumor growth in vitro and in vivo. However, the anti-tumor effects of this anti-p21Ras scFv were limited by short-term scFv expression due to a replication defect of KGHV100...
November 11, 2016: Gene Therapy
https://www.readbyqxmd.com/read/27825159/injection-of-htert-transduced-endothelial-progenitor-cells-promotes-beneficial-aortic-changes-in-a-high-fat-dietary-model-of-early-atherosclerosis
#17
Xingsheng Li, Yanru Deng, Shunrong Zhao, Dandan Zhang, Qingwei Chen
OBJECTIVES: Cultured endothelial progenitor cells (EPCs) display troubling issues that adversely affect their applicability to endothelial regeneration. We hypothesized that transduction of the human telomerase catalytic subunit (hTERT) gene would enhance EPC function in treating dietary-induced early atherosclerosis (AS). METHODS: A dietary-induced early AS model was successfully constructed in 90 healthy male rats, while 30 healthy control (HC) rats were normally fed...
November 9, 2016: Cardiology
https://www.readbyqxmd.com/read/27823970/expression-of-functional-alternative-telomerase-rna-component-gene-in-mouse-brain-and-in-motor-neurons-cells-protects-from-oxidative-stress
#18
Erez Eitan, Admoni Tamar, Grin Yossi, Refael Peleg, Alex Braiman, Esther Priel
Telomerase, a ribonucleoprotein, is highly expressed and active in many tumor cells and types, therefore it is considered to be a target for anti-cancer agents. On the other hand, recent studies demonstrated that activation of telomerase is a potential therapeutic target for age related diseases. Telomerase mainly consists of a catalytic protein subunit with a reverse transcription activity (TERT) and an RNA component (TERC), a long non-coding RNA, which serves as a template for the re-elongation of telomeres by TERT...
November 3, 2016: Oncotarget
https://www.readbyqxmd.com/read/27822469/pten-inhibits-cell-proliferation-promotes-cell-apoptosis-and-induces-cell-cycle-arrest-via-downregulating-the-pi3k-akt-htert-pathway-in-lung-adenocarcinoma-a549-cells
#19
Xiao-Xiao Lu, Lan-Yu Cao, Xi Chen, Jian Xiao, Yong Zou, Qiong Chen
PTEN plays an essential role in tumorigenesis and both its mutation and inactivation can influence proliferation, apoptosis, and cell cycle progression in tumor cells. However, the precise role of PTEN in lung cancer cells has not been well studied. To address this, we have generated lung adenocarcinoma A549 cells overexpressing wild-type or mutant PTEN as well as A549 cells expressing a siRNA directed toward endogenous PTEN. Overexpression of wild-type PTEN profoundly inhibited cell proliferation, promoted cell apoptosis, caused cell cycle arrest at G1, downregulated p-AKT, and decreased expression of the telomerase protein hTERT...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27810593/novel-phenylenediamine-bridged-mixed-ligands-dimetallic-square-planner-pt-ii-complex-inhibits-mmps-expression-via-p53-and-caspase-dependent-signaling-and-suppress-cancer-metastasis-and-invasion
#20
Faiz-Ur Rahman, Amjad Ali, Inam Ullah Khan, Hong-Quan Duong, Rong Guo, Hui Wang, Zhan-Ting Li, Dan-Wei Zhang
Novel phenylenediamine bridged mixed ligands dimetallic square planner Pt(II) complex (L-Pt-Py) was synthesized from simple commercially available precursors in good yield and characterized by (1)H, (13)C, 2D NOESY NMR and high resolution mass spectrometry (HR-ESI-MS). The stability of L-Pt-Py was checked by (1)H NMR in mixed DMSO-d6/D2O solvents. L-Pt-Py showed considerable in vitro cytotoxicity in lung (A549), breast (MCF-7) and liver (HepG2) cancer cell lines and strong in vivo growth inhibition in Escherichia coli (E...
October 22, 2016: European Journal of Medicinal Chemistry
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