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https://www.readbyqxmd.com/read/28645043/in-vitro-and-in-vivo-behavior-of-dna-tetrahedrons-as-tumor-targeting-nanocarriers-for-doxorubicin-delivery
#1
Ji Hee Kang, Kyoung-Ran Kim, Hyukjin Lee, Dae-Ro Ahn, Young Tag Ko
Deoxyribonucleic acid (DNA) is a versatile material with high applicability and inherent biocompatibility. L-DNA, the perfect mirror form of the naturally occurring D-DNA, has been used in DNA nanotechnology. It has thermodynamically identical properties to D-DNA, is capable of self-assembly and bio-orthogonal base-pairing, and is resistant to nuclease activity. We previously constructed an L-DNA tetrahedron (L-Td) and found that this nanostructure has remarkably higher capacity for cell penetration than its natural counterpart (D-Td)...
June 16, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28642594/differential-effects-on-gene-transcription-and-hematopoietic-differentiation-correlate-with-gata2-mutant-disease-phenotypes
#2
C-E Chong, P Venugopal, P H Stokes, Y K Lee, P J Brautigan, D T O Yeung, M Babic, G A Engler, S W Lane, M Klingler-Hoffmann, J M Matthews, R J D'Andrea, A L Brown, C N Hahn, H S Scott
Heterozygous GATA2 mutations underlie an array of complex hematopoietic and lymphatic diseases. Analysis of the literature reporting three recurrent GATA2 germline (g) mutations (gT354M, gR396Q, gR398W) revealed different phenotype tendencies. While all three mutants differentially predispose to myeloid malignancies, there was no difference in leukemia-free survival for GATA2 patients. Despite intense interest, the molecular pathogenesis of GATA2 mutation is poorly understood. We functionally characterized a GATA2 mutant allelic series representing major disease phenotypes caused by germline and somatic (s) mutations in zinc finger (ZF) 2...
June 23, 2017: Leukemia: Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
https://www.readbyqxmd.com/read/28641700/-molecular-imaging-in-vivo-detection-of-egfr-mutations-in-non-small-cell-lung-cancer
#3
Danjing Luo, Jin'an Ma, Jinming Zhang, Yanzhong Zhao
An ever increasing number of drugs directed as epidermal growth factor receptor tyrosine kinase inhibitor (EGFR-TKI) bring a new revolution for non-small cell lung cancer (NSCLC) therapy, and many large scales of studies show that only people with EGFR-sensitive mutation can benefit from these drugs. The main method of EGFR mutation detection is to analyze the DNA sequence of EGFR, which can be the lung cancer tissue, pleural fluid tumor cells, circulating tumor cells and peripheral blood free DNA obtained by surgery or puncture, the biggest drawback is that the heterogeneity of EGFR mutation cannot be analyzed...
June 20, 2017: Zhongguo Fei Ai za Zhi, Chinese Journal of Lung Cancer
https://www.readbyqxmd.com/read/28641578/methylome-analysis-of-extreme-chemoresponsive-patients-identifies-novel-markers-of-platinum-sensitivity-in-high-grade-serous-ovarian-cancer
#4
Tushar Tomar, Nicolette G Alkema, Leroy Schreuder, Gert Jan Meersma, Tim de Meyer, Wim van Criekinge, Harry G Klip, Heidi Fiegl, Els van Nieuwenhuysen, Ignace Vergote, Martin Widschwendter, Ed Schuuring, Ate G J van der Zee, Steven de Jong, G Bea A Wisman
BACKGROUND: Despite an early response to platinum-based chemotherapy in advanced stage high-grade serous ovarian cancer (HGSOC), the majority of patients will relapse with drug-resistant disease. Aberrant epigenetic alterations like DNA methylation are common in HGSOC. Differences in DNA methylation are associated with chemoresponse in these patients. The objective of this study was to identify and validate novel epigenetic markers of chemoresponse using genome-wide analysis of DNA methylation in extreme chemoresponsive HGSOC patients...
June 23, 2017: BMC Medicine
https://www.readbyqxmd.com/read/28641499/a-comprehensive-model-for-heat-induced-radio-sensitization
#5
Sarah Catharina Brüningk, Jannat Ijaz, Ian Rivens, Simeon Nill, Gail Ter Haar, Uwe Oelfke
Combined radiotherapy (RT) and hyperthermia (HT) treatments may improve treatment outcome by heat induced radio-sensitization. We propose an empirical cell survival model (AlphaR model) to describe this multimodality therapy. The model is motivated by the observation that heat induced radio-sensitization may be explained by a reduction in the DNA damage repair capacity of heated cells. We assume that this repair is only possible up to a threshold level above which survival will decrease exponentially with dose...
June 23, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28641314/no-additional-prognostic-value-for-mre11-in-squamous-cell-carcinomas-of-the-anus-treated-with-chemo-radiotherapy
#6
Alexandra K Walker, Christiana Kartsonaki, Elena Collantes, Judith Nicholson, Duncan C Gilbert, Anne E Kiltie
BACKGROUND: The majority of anal cancers (84-95%) are driven by infection with human papillomavirus (HPV). HPV-positive tumours show significantly better responses to chemo-radiotherapy when compared with HPV-negative tumours. HPV infection is linked to alterations in DNA damage response proteins, including MRE11. MRE11 is a potential predictive biomarker for response to radiotherapy in muscle-invasive bladder cancer and may hold predictive power in other cancers. METHODS: Using a previously reported cohort, we evaluated the levels of MRE11 in anal cancer and assessed its predictive value in this disease...
June 22, 2017: British Journal of Cancer
https://www.readbyqxmd.com/read/28640470/contingent-first-trimester-screening-for-aneuploidies-with-cell-free-dna-in-a-danish-clinical-setting
#7
Caroline Borregaard Miltoft, Line Rode, Charlotte Kvist Ekelund, Karin Sundberg, Susanne Kjaergaard, Helle Zingenberg, Ann Tabor
OBJECTIVES: The primary aim was to compare the screening performance for Trisomy 21, of standard combined first trimester screening with referral to invasive testing at a cut-off at 1 in 300, with a contingent testing, consisting of referral to invasive testing at a 1 in 100 cut-off and referral to cell-free DNA (cfDNA) testing for a risk between 1 in 100 and 1 in 1000. METHODS: Singleton pregnant women with a combined first trimester risk ≥ 1 in 1000 were consecutively recruited from two Danish hospitals between August 2014 and May 2015...
June 22, 2017: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28640401/two-stage-approach-for-risk-estimation-of-fetal-trisomy-21-and-other-aneuploidies-using-computational-intelligence-systems
#8
A C Neocleous, A Syngelaki, K H Nicolaides, C N Schizas
OBJECTIVE: To estimate the risk for fetal trisomy 21 (T21) and other chromosomal abnormalities at 11-13 week's gestation using computational intelligence classification methods. METHODS: As a first step, we train the artificial neural networks with 72054 euploid pregnancies, 295 cases of T21 and 305 of other chromosomal abnormalities (OCA). Then, we sort the cases into two categories of "no-risk" and "risk". The cases of "no-risk" are no further examined, while the cases with "risk" are forwarded in Stage 2 for further examination where we classify them in three types of risk, namely "no-risk", "moderate-risk" and "high-risk"...
June 22, 2017: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28636991/non-invasive-detection-of-somatic-mutations-using-next-generation-sequencing-in-primary-central-nervous-system-lymphoma
#9
Maxime Fontanilles, Florent Marguet, Élodie Bohers, Pierre-Julien Viailly, Sydney Dubois, Philippe Bertrand, Vincent Camus, Sylvain Mareschal, Philippe Ruminy, Catherine Maingonnat, Stéphane Lepretre, Elena-Liana Veresezan, Stéphane Derrey, Hervé Tilly, Jean-Michel Picquenot, Annie Laquerrière, Fabrice Jardin
PURPOSE: Primary central nervous system lymphomas (PCNSL) have recurrent genomic alterations. The main objective of our study was to demonstrate that targeted sequencing of circulating cell-free DNA (cfDNA) released by PCNSL at the time of diagnosis could identify somatic mutations by next-generation sequencing (NGS). PATIENTS AND METHODS: PlasmacfDNA and matched tumor DNA (tDNA) from 25 PCNSL patients were sequenced using an Ion Torrent Personal Genome Machine (Life Technologies®)...
June 1, 2017: Oncotarget
https://www.readbyqxmd.com/read/28636544/analysis-of-esr1-and-pik3ca-mutations-in-plasma-cell-free-dna-from-er-positive-breast-cancer-patients
#10
Takashi Takeshita, Yutaka Yamamoto, Mutsuko Yamamoto-Ibusuki, Mai Tomiguchi, Aiko Sueta, Keiichi Murakami, Yoko Omoto, Hirotaka Iwase
BACKGROUND: The measurement of ESR1 and PIK3CA mutations in plasma cell-free DNA (cfDNA) has been studied as a non-invasive method to quickly assess and monitor endocrine therapy (ET) resistant metastatic breast cancer (MBC) patients. METHODS: The subjects of this retrospective study were a total of 185 plasma samples from 86 estrogen receptor-positive BC patients, of which 151 plasma samples were from 69 MBC patients and 34 plasma samples were from 17 primary BC (PBC) patients...
June 14, 2017: Oncotarget
https://www.readbyqxmd.com/read/28636317/downsizing-proto-oncogene-cfos-to-short-helix-constrained-peptides-that-bind-jun
#11
Daniel Baxter, Samuel R Perry, Timothy A Hill, W Mei Kok, Nathan R Zaccai, R Leo Brady, David P Fairlie, Jody M Mason
The oncogenic transcription factor activator protein-1 (AP-1) is a DNA-binding protein that assembles through dimerization of Fos and Jun protein subunits, their leucine-rich helical sequences entwining into a coiled-coil structure. This study reports on downsizing the proto-oncogene cFos protein (380 residues) to shorter peptides (37-25 residues) modified with helix-inducing constraints to enhance binding to Jun. A crystal structure is reported for a 37-residue Fos-derived peptide (FosW) bound to Jun. This guided iterative downsizing of FosW to shorter peptide sequences that were constrained into stable water-soluble α-helices by connecting amino acid side chains to form cyclic pentapeptide components...
June 21, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28635528/clinical-social-and-ethical-issues-associated-with-non-invasive-prenatal-testing-for-aneuploidy
#12
Blanche Griffin, Samantha Edwards, Lyn S Chitty, Celine Lewis
Non-invasive prenatal testing (NIPT), based on analysis of cell-free foetal DNA, is rapidly becoming a preferred method to screen for chromosomal aneuploidy with the technology now available in over 90 countries. This review provides an up-to-date discussion of the key clinical, social and ethical implications associated with this revolutionary technology. Stakeholders are positive about a test that is highly accurate, safe, can be perfomed early in pregnancy, identifies affected pregnancies that might otherwise have been missed and reduces the need for invasive testing...
February 9, 2017: Journal of Psychosomatic Obstetrics and Gynaecology
https://www.readbyqxmd.com/read/28635329/lead-induces-siberian-tiger-fibroblast-apoptosis-by-interfering-with-intracellular-homeostasis
#13
Zheng Liu, Hui Wang, Wenxiu Zhang, Ziao Yuan, Hongyi Yuan, Xueting Liu, Minghai Zhang, Xuesong Guo, Weijun Guan
Lead (Pb(2+)) is a poisonous heavy metal that causes many pathophysiological effects in living systems. Its toxicological effects are well known as it causes apoptosis of several cell types and tissues. This study aimed to determine the criteria required for early diagnosis of Pb(2+) poisoning in the Siberian tiger using a tiger population in China, to identify a safety Pb(2+) concentration threshold, and to provide suggestions for preventing Pb(2+) poisoning in Siberian tigers. We investigated the apoptotic effects of Pb(2+) (0, 32, 64, and 125 μM) for 12-48 h on Siberian tiger fibroblasts in vitro...
June 21, 2017: Drug and Chemical Toxicology
https://www.readbyqxmd.com/read/28632936/peritumoral-cuffing-by-t-cell-tumor-infiltrating-lymphocytes-distinguishes-hpv-related-oropharyngeal-squamous-cell-carcinoma-from-oral-cavity-squamous-cell-carcinoma
#14
Kate Poropatich, David Hernandez, Joel Fontanarosa, Koshonna Brown, Gayle Woloschak, Ajit Paintal, Kirtee Raparia, Sandeep Samant
BACKGROUND: It is unclear why human papillomavirus (HPV)-related head and neck squamous cell carcinoma (HNSCC) has improved clinical behavior compared to HPV-negative HNSCC. We sought to better characterize the immune microenvironment of tongue cancers by examining the CD3 and CD8 TIL pattern in HPV-positive and -negative tumors. METHODS: Histologic sections from 40 oral tongue and oropharyngeal cases were analyzed (n= 21 HPV DNA-positive, n= 19 HPV DNA-negative)...
June 20, 2017: Journal of Oral Pathology & Medicine
https://www.readbyqxmd.com/read/28631801/morphology-of-elastic-nematic-liquid-crystal-membranes
#15
Pardis Rofouie, Damiano Pasini, Alejandro D Rey
Liquid crystalline phases found in many biological materials, such as actin, DNA, cellulose, and collagen can be responsible for the deformation of cell membranes. In this paper, cell membrane deformation is investigated through the coupling between liquid crystal anisotropy and membrane bending elasticity. The generalized shape equation for anisotropic interfaces, which resort to the Cahn-Hoffman capillarity vector, the Rapini-Papoular anchoring energy, and the Helfrich elastic energy, is applied to gain insight into the deformation of closed liquid crystal membranes...
June 20, 2017: Soft Matter
https://www.readbyqxmd.com/read/28631163/evaluation-of-streck-bct-and-paxgene-stabilised-blood-collection-tubes-for-cell-free-circulating-dna-studies-in-plasma
#16
Kristina Warton, Nicole L Yuwono, Mark J Cowley, Mark J McCabe, Alwin So, Caroline E Ford
INTRODUCTION: Blood samples for studies of circulating DNA in disease are often collected in clinical settings where prompt processing of samples is not possible. In order to avoid problems associated with leukocyte lysis after prolonged blood storage, stabilised blood tubes have been developed containing preservatives that prevent cell lysis. We evaluated Streck BCT tubes and PAXgene ccfDNA tubes, as well as standard EDTA blood collection tubes, in terms of DNA yield and fragment size...
June 19, 2017: Molecular Diagnosis & Therapy
https://www.readbyqxmd.com/read/28629450/interaction-with-adipocyte-stromal-cells-induces-breast-cancer-malignancy-via-s100a7-upregulation-in-breast-cancer-microenvironment
#17
Minako Sakurai, Yasuhiro Miki, Kiyoshi Takagi, Takashi Suzuki, Takanori Ishida, Noriaki Ohuchi, Hironobu Sasano
BACKGROUND: Breast adipocytes play important roles in both the development and function of mammary epithelial cells. Therefore, carcinoma-adipose stromal cell (ASC) interactions have been considered pivotal in supporting tumor growth in breast cancer. In addition, it has been demonstrated that the biological features of cancer-associated adipocytes differ from those of normal ASCs. Therefore, we investigated an interaction between ASCs and carcinoma cell lines to identify genes associated with ASC invasion of carcinoma cells...
June 19, 2017: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/28629339/droplet-digital-pcr-for-detection-and-quantification-of-circulating-tumor-dna-in-plasma-of-head-and-neck-cancer-patients
#18
Joost H van Ginkel, Manon M H Huibers, Robert J J van Es, Remco de Bree, Stefan M Willems
BACKGROUND: During posttreatment surveillance of head and neck cancer patients, imaging is insufficiently accurate for the early detection of relapsing disease. Free circulating tumor DNA (ctDNA) may serve as a novel biomarker for monitoring tumor burden during posttreatment surveillance of these patients. In this exploratory study, we investigated whether low level ctDNA in plasma of head and neck cancer patients can be detected using Droplet Digital PCR (ddPCR). METHODS: TP53 mutations were determined in surgically resected primary tumor samples from six patients with high stage (II-IV), moderate to poorly differentiated head and neck squamous cell carcinoma (HNSCC)...
June 19, 2017: BMC Cancer
https://www.readbyqxmd.com/read/28629197/reply-to-the-letter-to-the-editor-by-c-nicolazzo-et-al-circulating-cell-free-dna-and-circulating-tumor-cells-as-prognostic-and-predictive-biomarkers-in-advanced-non-small-cell-lung-cancer-patients-treated-with-first-line-chemotherapy
#19
https://www.readbyqxmd.com/read/28627886/experimentally-validated-model-enables-debottlenecking-of-in-vitro-protein-synthesis-and-identifies-a-control-shift-under-in-vivo-conditions
#20
Alexander Nieß, Jurek Failmezger, Maike Kuschel, Martin Siemann-Herzberg, Ralf Takors
Cell-free (in vitro) protein systems (CFPS) provide a versatile tool that can be used to investigate different aspects of the transcription-translation machinery by reducing cells to the basic functions of protein formation. Recent improvements in reaction stability and lysate preparation offer the potential to expand the scope of in vitro biosynthesis from a research tool to a multifunctional and versatile platform for protein production and synthetic biology. To date, even the best-performing CFPS are drastically slower than in vivo references...
June 19, 2017: ACS Synthetic Biology
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