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https://www.readbyqxmd.com/read/28431509/regular-recreational-physical-activity-and-risk-of-head-and-neck-cancer
#1
Chen-Lin Lin, Wei-Ting Lee, Chun-Yen Ou, Jenn-Ren Hsiao, Cheng-Chih Huang, Jehn-Shyun Huang, Tung-Yiu Wong, Ken-Chung Chen, Sen-Tien Tsai, Sheen-Yie Fang, Tze-Ta Huang, Jiunn-Liang Wu, Yuan-Hua Wu, Wei-Ting Hsueh, Chia-Jui Yen, Yu-Hsuan Lai, Hsiao-Chen Liao, Shang-Yin Wu, Ming-Wei Yang, Forn-Chia Lin, Jang-Yang Chang, Yi-Hui Wang, Ya-Ling Weng, Han-Chien Yang, Yu-Shan Chen, Jeffrey S Chang
BACKGROUND: Although substantial evidence supports a 20-30% risk reduction of colon cancer, breast cancer, and endometrial cancer by physical activity (PA), the evidence for head and neck cancer (HNC) is limited. Three published studies on the association between PA and HNC have generated inconsistent results. The current study examined the association between recreational PA (RPA) and HNC risk with a more detailed assessment on the intensity, frequency, duration, and total years of RPA...
April 21, 2017: BMC Cancer
https://www.readbyqxmd.com/read/28430587/parkin-regulates-translesion-dna-synthesis-in-response-to-uv-radiation
#2
Xuefei Zhu, Xiaolu Ma, Yingfeng Tu, Min Huang, Hongmei Liu, Fengli Wang, Juanjuan Gong, Jiuqiang Wang, Xiaoling Li, Qian Chen, Hongyan Shen, Shu Zhu, Yun Wang, Yang Liu, Caixia Guo, Tie-Shan Tang
Deficiency of Parkin is a major cause of early-onset Parkinson's disease (PD). Notably, PD patients also exhibit a significantly higher risk in melanoma and other skin tumors, while the mechanism remains largely unknown. In this study, we show that depletion of Parkin causes compromised cell viability and genome stability after ultraviolet (UV) radiation. We demonstrate that Parkin promotes efficient Rad18-dependent proliferating cell nuclear antigen (PCNA) monoubiquitination by facilitating the formation of Replication protein A (RPA)-coated ssDNA upon UV radiation...
April 5, 2017: Oncotarget
https://www.readbyqxmd.com/read/28429132/development-of-a-real-time-recombinase-polymerase-amplification-assay-for-rapid-and-sensitive-detection-of-porcine-circovirus-2
#3
Jianchang Wang, Jinfeng Wang, Libing Liu, Wanzhe Yuan
Porcine diseases associated with porcine circovirus 2 (PCV-2) infection have resulted in significant economic losses worldwide. A real-time recombinase polymerase amplification (RPA) assay was developed to detect PCV-2 using primers and an exo probe specific for the ORF2 gene. The reaction process can be completed in 20 min at 38 °C. The assay only detects PCV-2, as there was no cross-reaction with other pathogens important in pigs. Using the PCV-2 genomic DNA as template, the analytical sensitivity of the real-time RPA was 103 copies...
April 20, 2017: Archives of Virology
https://www.readbyqxmd.com/read/28424790/development-of-isothermal-recombinase-polymerase-amplification-assay-for-rapid-detection-of-porcine-circovirus-type-2
#4
Yang Yang, Xiaodong Qin, Yingjun Sun, Guozheng Cong, Yanmin Li, Zhidong Zhang
Porcine circovirus virus type II (PCV2) is the etiology of postweaning multisystemic wasting syndrome (PMWS), porcine dermatitis, nephropathy syndrome (PDNS), and necrotizing pneumonia. Rapid diagnosis tool for detection of PCV2 plays an important role in the disease control and eradication program. Recombinase polymerase amplification (RPA) assays using a real-time fluorescent detection (PCV2 real-time RPA assay) and RPA combined with lateral flow dipstick (PCV2 RPA LFD assay) were developed targeting the PCV2 ORF2 gene...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28417323/polymer-chain-collapse-induced-by-many-body-dipole-correlations
#5
Yu A Budkov, N N Kalikin, A L Kolesnikov
We present a simple analytical theory of a flexible polymer chain dissolved in a good solvent, carrying permanent freely oriented dipoles on the monomers. We take into account the dipole correlations within the random phase approximation (RPA), as well as a dielectric heterogeneity in the internal polymer volume relative to the bulk solution. We demonstrate that the dipole correlations of monomers can be taken into account as pairwise ones only when the polymer chain is in a coil conformation. In this case the dipole correlations manifest themselves through the Keesom interactions of the permanent dipoles...
April 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28415766/anti-proliferative-role-of-recombinant-lethal-toxin-of-bacillus-anthracis-on-primary-mammary-ductal-carcinoma-cells-revealing-its-therapeutic-potential
#6
Rekha Khandia, Bramhadev Pattnaik, Katherukamem Rajukumar, Atul Pateriya, Sandeep Bhatia, Harshad Murugkar, Anil Prakash, Hare Krishna Pradhan, Kuldeep Dhama, Ashok Munjal, Sunil K Joshi
Bacillus anthracis secretes three secretary proteins; lethal factor (LF), protective antigen (PA) and edema factor (EF). The LF has ability to check proliferation of mammary tumors, chiefly depending on mitogen activated protein kinase (MAPK) signaling pathway. Evaluation of therapeutic potential of recombinant LF (rLF), recombinant PA (rPA) and lethal toxin (rLF + rPA = LeTx) on the primary mammary ductal carcinoma cells revealed significant (p < 0.01) reduction in proliferation of tumor cells with mean inhibition indices of 28...
March 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/28396594/human-primpol-activity-is-enhanced-by-rpa
#7
María I Martínez-Jiménez, Antonio Lahera, Luis Blanco
Human PrimPol is a primase belonging to the AEP superfamily with the unique ability to synthesize DNA primers de novo, and a non-processive DNA polymerase able to bypass certain DNA lesions. PrimPol facilitates both mitochondrial and nuclear replication fork progression either acting as a conventional TLS polymerase, or repriming downstream of blocking lesions. In vivo assays have shown that PrimPol is rapidly recruited to sites of DNA damage by interaction with the human replication protein A (RPA). In agreement with previous findings, we show here that the higher affinity of RPA for ssDNA inhibits PrimPol activities in short ssDNA templates...
April 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28392409/a-rapid-isothermal-assay-for-the-detection-of-hop-stunt-viroid-in-hop-plants-humulus-lupulus-and-its-application-in-disease-surveys
#8
Madhu Kappagantu, Dan Edward V Villamor, Jeff M Bullock, Kenneth C Eastwell
Hop stunt disease caused by Hop stunt viroid (HSVd) is a growing threat to hop cultivation globally. HSVd spreads mainly by use of contaminated planting material and by mechanical means. Thorough testing of hop yards and removal of infected bines are critical components of efforts to control the spread of the disease. Reverse transcription-polymerase chain reaction (RT-PCR) has become the primary technique used for HSVd detection; however, sample handling and analysis are technically challenging. In this study, a robust reverse transcription-recombinase polymerase amplification (RT-RPA) assay was developed to facilitate analysis of multiple samples...
April 7, 2017: Journal of Virological Methods
https://www.readbyqxmd.com/read/28391386/assessment-of-prognostic-scores-of-brain-metastases-from-lung-adenocarcinoma-with-egfr-mutations
#9
Hongwei Li, Jianhong Lian, Hongxing Jin, Weili Wang, Jianzhong Cao, Xiaqin Zhang, Xin Song, Sufang Jia, Haixia Jia, Jiwei Ren, Songyan Han, Weihua Yang, Yanfeng Xi, Shengmin Lan
The aim of this study was to analyze prognostic factors and evaluate the value of four prognostic scores including RPA, DS-GPA BS-BM, GGS for the EGFR mutant BM patients from lung adenocarcinoma treated with EGFR-TKI. Data of NSCLC were retrospectively reviewed from August 2010 to June 2015 using the medical database of Shanxi Provincial Cancer Hospital. Patients with BM from lung adenocarcinoma with mutant EGFR treated by EGFR-TKI or a combination of EGFR-TKI and WBRT were included. Potential prognostic factors were statistically examined...
April 8, 2017: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/28388124/development-of-an-excited-state-calculation-method-for-large-systems-using-dynamical-polarizability-a-divide-and-conquer-approach-at-the-time-dependent-density-functional-level
#10
Hiromi Nakai, Takeshi Yoshikawa
In this study, we developed an excited-state calculation method for large systems using dynamical polarizabilities at the time-dependent density functional theory level. Three equivalent theories, namely, coupled-perturbed self-consistent field (CPSCF), random phase approximation (RPA), and Green function (GF), were extended to linear-scaling methods using the divide-and-conquer (DC) technique. The implementations of the standard and DC-based CPSCF, RPA, and GF methods are described. Numerical applications of these methods to polyene chains, single-wall carbon nanotubes, and water clusters confirmed the accuracy and efficiency of the DC-based methods, especially DC-GF...
March 28, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28388105/charge-transfer-excitations-from-particle-particle-random-phase-approximation-opportunities-and-challenges-arising-from-two-electron-deficient-systems
#11
Yang Yang, Adriel Dominguez, Du Zhang, Vitalij Lutsker, Thomas A Niehaus, Thomas Frauenheim, Weitao Yang
The particle-particle random phase approximation (pp-RPA) is a promising method for studying charge transfer(CT) excitations. Through a detailed analysis on two-electron deficient systems, we show that the pp-RPA is always able to recover the long-distance asymptotic -1/R trend for CT excitations as a result of the concerted effect between orbital energies and the pp-RPA kernel. We also provide quantitative results for systems with relatively short donor-acceptor distances. With conventional hybrid or range-separated functionals, the pp-RPA performs much better than time-dependent density functional theory (TDDFT), although it still gives underestimated results which are not as good as TDDFT with system-dependent tuned functionals...
March 28, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28384095/age-specific-indicators-of-a-healthy-lifestyle-and-postmenopausal-breast-cancer
#12
Kathleen M McClain, Lauren E McCullough, Patrick T Bradshaw, Sumitra Shantakumar, Mary Beth Terry, Alfred I Neugut, Marilie D Gammon
INTRODUCTION: Modifiable lifestyle factors have been consistently associated with breast cancer, and risk may vary by menopausal status. However, whether these associations vary according to age among postmenopausal women remains unresolved. METHODS: Using postmenopausal women from a population-based case-control study (990 cases and 1006 frequency-matched controls), we conducted multivariable-adjusted unconditional logistic regression to estimate odds ratios (ORs) and 95% confidence intervals (CIs) for lifestyle factors (lifetime alcohol intake, body mass index [BMI] in the year before diagnosis, lifetime recreational physical activity [RPA], and nonsteroidal anti-inflammatory drug use) in association with breast cancer stratified by age (<65 vs...
April 6, 2017: Journal of Women's Health
https://www.readbyqxmd.com/read/28382440/tetralogy-of-fallot-surgical-repair-shunt-configurations-ductus-arteriosus-and-the-circle-of-willis
#13
Senol Piskin, Gozde Unal, Ahmet Arnaz, Tayyar Sarioglu, Kerem Pekkan
In this study, hemodynamic performance of three novel shunt configurations that are considered for the surgical repair of tetralogy of Fallot (TOF) disease are investigated in detail. Clinical experience suggests that the shunt location, connecting angle, and its diameter can influence the post-operative physiology and the neurodevelopment of the neonatal patient. An experimentally validated second order computational fluid dynamics (CFD) solver and a parametric neonatal diseased great artery model that incorporates the ductus arteriosus (DA) and the full patient-specific circle of Willis (CoW) are employed...
April 5, 2017: Cardiovascular Engineering and Technology
https://www.readbyqxmd.com/read/28381412/the-ddr-at-telomeres-lacking-intact-shelterin-does-not-require-substantial-chromatin-decompaction
#14
Leonid A Timashev, Hazen Babcock, Xiaowei Zhuang, Titia de Lange
Telomeres are protected by shelterin, a six-subunit protein complex that represses the DNA damage response (DDR) at chromosome ends. Extensive data suggest that TRF2 in shelterin remodels telomeres into the t-loop structure, thereby hiding telomere ends from double-stranded break repair and ATM signaling, whereas POT1 represses ATR signaling by excluding RPA. An alternative protection mechanism was suggested recently by which shelterin subunits TRF1, TRF2, and TIN2 mediate telomeric chromatin compaction, which was proposed to minimize access of DDR factors...
March 15, 2017: Genes & Development
https://www.readbyqxmd.com/read/28373211/a-new-sub-pathway-of-long-patch-base-excision-repair-involving-5-gap-formation
#15
Jordan Woodrick, Suhani Gupta, Sharon Camacho, Swetha Parvathaneni, Sujata Choudhury, Amrita Cheema, Yi Bai, Pooja Khatkar, Hayriye Verda Erkizan, Furqan Sami, Yan Su, Orlando D Schärer, Sudha Sharma, Rabindra Roy
Base excision repair (BER) is one of the most frequently used cellular DNA repair mechanisms and modulates many human pathophysiological conditions related to DNA damage. Through live cell and in vitro reconstitution experiments, we have discovered a major sub-pathway of conventional long-patch BER that involves formation of a 9-nucleotide gap 5' to the lesion. This new sub-pathway is mediated by RECQ1 DNA helicase and ERCC1-XPF endonuclease in cooperation with PARP1 poly(ADP-ribose) polymerase and RPA The novel gap formation step is employed during repair of a variety of DNA lesions, including oxidative and alkylation damage...
April 3, 2017: EMBO Journal
https://www.readbyqxmd.com/read/28367276/the-effect-of-whole-brain-radiation-wbi-and-karnofsky-performance-status-kps-on-survival-of-patients-receiving-stereotactic-radiosurgery-srs-for-second-brain-metastatic-event
#16
D R Brown, R Lanciano, C Heal, A Hanlon, J Yang, J Feng, M Stanley, R Buonocore, A Okpaku, W Ding, S Arrigo, J Lamond, L Brady
OBJECTIVE: The objective of the present study is to analyze prognostic factors affecting survival of patients receiving stereotactic radiosurgery (SRS) for second brain metastatic event (SBME) following initial treatment with whole brain irradiation (WBI), surgical resection, or previous SRS. METHODS: The 88 patients treated with SRS for SBME at Philadelphia CyberKnife between January 2006 and October 2013 were included in the study group. Cox proportional-hazards regression was used to identify prognostic factors that significantly impacted survival from the time of SRS for SBME...
2017: Journal of Radiation Oncology
https://www.readbyqxmd.com/read/28351524/g9a-governs-colon-cancer-stem-cell-phenotype-and-chemoradioresistance-through-pp2a-rpa-axis-mediated-dna-damage-response
#17
Chi-Wen Luo, Jaw-Yuan Wang, Wen-Chun Hung, Guang Peng, Ya-Li Tsai, Tsung-Ming Chang, Chee-Yin Chai, Chih-Hung Lin, Mei-Ren Pan
BACKGROUND AND PURPOSE: Neoadjuvant concurrent chemoradiotherapy (CCRT) is a standard treatment of locally advanced colon cancer cell (CRC). In order to maximize efficacy and minimize toxicity, new drugs have been developed and used in combination with CCRT. Recently, it has been shown that G9a plays a role in mediating phenotypes of cancer stem cells (CSCs). This study aimed to characterize G9a as a biomarker in predicting therapy response to prevent overtreatment and adverse effects in CRC patients...
March 25, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28345860/instant-visual-and-instrument-free-method-for-on-site-screening-of-gts-40-3-2-soybean-based-on-body-heat-triggered-recombinase-polymerase-amplification
#18
Rui Wang, Fang Zhang, Liu Wang, Wenjuan Qian, Cheng Qian, Jian Wu, Yibin Ying
On-site monitoring the plantation of genetically modified (GM) crops is of critical importance in agriculture industry throughout the world. In this paper, a simple, visual and instrument-free method for instant on-site detection of GTS 40-3-2 soybean has been developed. It is based on body-heat recombinase polymerase amplification (RPA) and followed with naked-eye detection via fluorescent DNA dye. Combining with extremely simplified sample preparation, the whole detection process can be accomplished within 10 min and the fluorescent results can be photographed by an accompanied smart phone...
April 6, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28345219/a-prototype-of-mathematical-treatment-of-pen-pressure-data-for-signature-verification
#19
Chi-Keung Li, Siu-Kay Wong, Lai-Chu Joyce Chim
A prototype using simple mathematical treatment of the pen pressure data recorded by a digital pen movement recording device was derived. In this study, a total of 48 sets of signature and initial specimens were collected. Pearson's correlation coefficient was used to compare the data of the pen pressure patterns. From the 820 pair comparisons of the 48 sets of genuine signatures, a high degree of matching was found in which 95.4% (782 pairs) and 80% (656 pairs) had rPA > 0.7 and rPA > 0.8, respectively...
March 26, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28342800/development-of-an-isothermal-recombinase-polymerase-amplification-assay-for-rapid-detection-of-pseudorabies-virus
#20
Yang Yang, Xiaodong Qin, Wei Zhang, Zhiyong Li, Shuaijun Zhang, Yanmin Li, Zhidong Zhang
Recombinase polymerase amplification assays using real-time fluorescent detection (real-time RPA assay) and lateral flow dipstick (RPA LFD assay) were developed targeting the gD gene of pseudorabies virus (PRV). Both assays were performed at 39 °C within 20 min. The sensitivity of the real-time RPA assay and the RPA LFD assay was 100 copies per reaction and 160 copies per reaction, respectively. Both assays did not detect DNAs from other virus or PRV negative samples. Therefore, the developed RPA assays provide a rapid, simple, sensitive and specific alternative tool for detection of PRV...
March 22, 2017: Molecular and Cellular Probes
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