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https://www.readbyqxmd.com/read/28629612/structural-basis-for-ribosome-rescue-in-bacteria
#1
REVIEW
Paul Huter, Claudia Müller, Stefan Arenz, Bertrand Beckert, Daniel N Wilson
Ribosomes that translate mRNAs lacking stop codons become stalled at the 3' end of the mRNA. Recycling of these stalled ribosomes is essential for cell viability. In bacteria three ribosome rescue systems have been identified so far, with the most ubiquitous and best characterized being the trans-translation system mediated by transfer-messenger RNA (tmRNA) and small protein B (SmpB). The two additional rescue systems present in some bacteria employ alternative rescue factor (Arf) A and release factor (RF) 2 or ArfB...
June 16, 2017: Trends in Biochemical Sciences
https://www.readbyqxmd.com/read/28625359/roles-of-arf6-in-cancer-cell-invasion-metastasis-and-proliferation
#2
REVIEW
Rui Li, Cheng Peng, Xianzhe Zhang, Yuewei Wu, Shida Pan, Yechen Xiao
ADP-ribosylation factor 6 (Arf6), a member of small GTPases ADP-ribosylation factor (Arf) family, expresses widely in mammalian cells and mainly regulates the functions of membrane traffic and actin remodeling. Current studies indicated that the activation and high expression of Arf6 protein may be significantly correlated with the invasion and metastasis of several tumors, such as breast cancer, pancreatic cancer, lung cancer, etc. Meanwhile, the ability of tumor invasion and metastasis can be suppressed when Arf6 activity is blocked by the inhibitors or small-interfering RNAs of Arf6...
June 15, 2017: Life Sciences
https://www.readbyqxmd.com/read/28616087/acute-rheumatic-fever-clinical-profile-in-children-in-western-ukraine
#3
O Boyarchuk, S Boytsanyuk, T Hariyan
Acute rheumatic fever (ARF) may have different clinical manifestations in different countries according to the genetic predisposition, prevalence of rheumatogenic strains, social and economic conditions. The purpose of this study was to determine the clinical characteristics of ARF in Western Ukraine and to improve the detection of the cases. A retrospective analysis of 85 medical clinical cases of in-hospital patients aged from 4 to 17 years old was performed. The cases covered patients who underwent treatment in the City Children's Hospital of Ternopil during 2000 and 2013 with the ARF diagnosis, which was established according to Jones criteria...
April 2017: Journal of Medicine and Life
https://www.readbyqxmd.com/read/28611183/the-lncrna-h19-mediates-breast-cancer-cell-plasticity-during-emt-and-met-plasticity-by-differentially-sponging-mir-200b-c-and-let-7b
#4
Wu Zhou, Xiao-Lei Ye, Jun Xu, Ming-Guo Cao, Zheng-Yu Fang, Ling-Yun Li, Guang-Hui Guan, Qiong Liu, Yue-Hui Qian, Dong Xie
Metastasis is a multistep process by which tumor cells disseminate from their primary site and form secondary tumors at a distant site. The pathophysiological course of metastasis is mediated by the dynamic plasticity of cancer cells, which enables them to shift between epithelial and mesenchymal phenotypes through a transcriptionally regulated program termed epithelial-to-mesenchymal transition (EMT) and its reverse process, mesenchymal-to-epithelial transition (MET). Using a mouse model of spontaneous metastatic breast cancer, we investigated the molecular mediators of metastatic competence within a heterogeneous primary tumor and how these cells then manipulated their epithelial-mesenchymal plasticity during the metastatic process...
June 13, 2017: Science Signaling
https://www.readbyqxmd.com/read/28610953/a-thirty-year-quest-for-a-role-of-r-ras-in-cancer-from-an-oncogene-to-a-multitasking-gtpase
#5
Wai Nam Liu, Mingfei Yan, Andrew M Chan
Since the identification of R-Ras, which is the first Ras-related GTPase isolated based on sequence similarity to the classical RAS oncogene, more than 160 members of the Ras superfamily of GTPases have been identified and classified into the Ras, Rho, Rap, Rab, Ran, Arf, Rheb, RGK, Rad, Rit, and Miro subfamilies. R-Ras belongs to the Ras subfamily of small G-proteins, which are frequently implicated in cell growth and differentiation. Although the roles of R-Ras in cellular transformation and integrin-mediated cell adhesion have been extensively studied, the physiological function of this enigmatic G-protein was only revealed when a mouse strain deficient in R-Ras was generated...
June 10, 2017: Cancer Letters
https://www.readbyqxmd.com/read/28603625/physiological-impact-of-high-flow-nasal-cannula-therapy-on-postextubation-acute-respiratory-failure-after-pediatric-cardiac-surgery-a-prospective-observational-study
#6
Naohiro Shioji, Tatsuo Iwasaki, Tomoyuki Kanazawa, Kazuyoshi Shimizu, Tomohiko Suemori, Kentaro Sugimoto, Yasutoshi Kuroe, Hiroshi Morimatsu
BACKGROUND: Reintubation after pediatric cardiac surgery is associated with a high rate of mortality. Therefore, adequate respiratory support for postextubation acute respiratory failure (ARF) is important. However, little is known about the physiological impact of high-flow nasal cannula (HFNC) therapy on ARF after pediatric cardiac surgery. Our working hypothesis was that HFNC therapy for postextubation ARF after pediatric cardiac surgery improves hemodynamic and respiratory parameters...
2017: Journal of Intensive Care
https://www.readbyqxmd.com/read/28602014/correlation-between-morphological-changes-and-functional-outcomes-of-recent-onset-macula-off-rhegmatogenous-retinal-detachment-prognostic-factors-in-rhegmatogenous-retinal-detachment
#7
Murat Karacorlu, Isil Sayman Muslubas, Mumin Hocaoglu, Serra Arf, Mehmet Giray Ersoz
PURPOSE: To assess correlation between preoperative and postoperative findings and surgical factors, and postoperative functional outcomes after successful repair of acute macula-off rhegmatogenous retinal detachment (RRD). METHODS: Forty-four eyes of 44 patients with recent-onset macula-off RRD who had primary pars plana vitrectomy were included in this retrospective study. Best-corrected visual acuity (BCVA) and retinal and choroidal changes on spectral-domain optical coherence tomography (SD-OCT) were evaluated before and after surgery...
June 10, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28597703/scoring-model-to-predict-outcome-in-critically-ill-cirrhotic-patients-with-acute-respiratory-failure-comparison-with-meld-scoring-models-and-clif-sofa-score
#8
Xiao-Dong Zhou, Qin-Fen Chen, Ming-Chun Zhang, Sven Van Poucke, Wen-Yue Liu, Yao Lu, Ke-Qing Shi, Wei-Jian Huang, Ming-Hua Zheng
BACKGROUND: Critically ill cirrhotic patients have a high mortality, particularly with concomitant respiratory failure on admission. There are no specific models in use for mortality risk assessment in critically ill cirrhotic patients with acute respiratory failure (CICRF). The aim is to develop a risk prediction model specific to CICRF in order to quantify the severity of illness. METHODS: We analyzed 949 CICRF patients extracted from the MIMIC-III database. The novel model (ARF-CLIF-SOFA) was developed from the CLIF-SOFA score...
June 15, 2017: Expert Review of Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/28593993/myc-activation-cooperates-with-vhl-and-ink4a-arf-loss-to-induce-clear-cell-renal-cell-carcinoma
#9
Sean T Bailey, Aleisha M Smith, Jordan Kardos, Sara E Wobker, Harper L Wilson, Bhavani Krishnan, Ryoichi Saito, Hyo Jin Lee, Jing Zhang, Samuel C Eaton, Lindsay A Williams, Ujjawal Manocha, Dorien J Peters, Xinchao Pan, Thomas J Carroll, Dean W Felsher, Vonn Walter, Qing Zhang, Joel S Parker, Jen Jen Yeh, Richard A Moffitt, Janet Y Leung, William Y Kim
Renal carcinoma is a common and aggressive malignancy whose histopathogenesis is incompletely understood and that is largely resistant to cytotoxic chemotherapy. We present two mouse models of kidney cancer that recapitulate the genomic alterations found in human papillary (pRCC) and clear cell RCC (ccRCC), the most common RCC subtypes. MYC activation results in highly penetrant pRCC tumours (MYC), while MYC activation, when combined with Vhl and Cdkn2a (Ink4a/Arf) deletion (VIM), produce kidney tumours that approximate human ccRCC...
June 8, 2017: Nature Communications
https://www.readbyqxmd.com/read/28593132/activation-of-wnt-%C3%AE-catenin-signaling-by-lithium-chloride-attenuates-d-galactose-induced-neurodegeneration-in-the-auditory-cortex-of-a-rat-model-of-aging
#10
Ming-Yu Xia, Xue-Yan Zhao, Qi-Lin Huang, Hai-Ying Sun, Chen Sun, Jie Yuan, Chang He, Yu Sun, Xiang Huang, Wen Kong, Wei-Jia Kong
Degeneration of the central auditory system, which is characterized by reduced understanding of speech and source localization of sounds, is an important cause of age-related hearing loss (presbycusis). Accumulating evidence has demonstrated that Wnt/β-catenin signaling plays an essential role in the development of the auditory system but its potential role in presbycusis remains unclear. In this study, we used a rat model of aging, created by chronic systemic exposure to d-galactose (d-gal), and explored changes in Wnt/β-catenin signaling in the auditory cortex...
June 2017: FEBS Open Bio
https://www.readbyqxmd.com/read/28584022/ikk%C3%AE-mediated-resistance-to-skin-cancer-development-is-ink4a-arf-dependent
#11
Angustias Page, Ana Bravo, Cristian Suárez-Cabrera, Josefa P Alameda, M LLanos Casanova, Corina Lorz, Carmen Segrelles, Jose C Segovia, Jesus M Paramio, Manuel Navarro, Angel Ramírez
IKKβ (encoded by IKBKB) is a protein kinase that regulates the activity of numerous proteins important in several signaling pathways, such as the nuclear factor kappa B (NF-κB) pathway. IKKβ exerts a pro-tumorigenic role in several animal models of lung, hepatic, intestinal and oral cancer. In addition, genomic and proteomic studies of human tumors also indicate that IKBKB gene is amplified or overexpressed in multiple tumor types. Here, the relevance of IKKβ in skin cancer was determined by performing carcinogenesis studies in animal models overexpressing IKKβ in the basal skin layer...
June 5, 2017: Molecular Cancer Research: MCR
https://www.readbyqxmd.com/read/28578572/the-origins-of-dramatic-differences-in-5-membered-vs-6-membered-chelation-of-pd-ii-on-efficiency-of-c-sp-3-h-bond-activation
#12
Yun-Fang Yang, Gang Chen, Xin Hong, Jin-Quan Yu, Kendall N Houk
The origin of the unique effectiveness of 6-membered chelates on the β-methylene C(sp(3))-H activation reactions by Pd(II) catalyst was explained with density functional theory. The Pd(II) catalysts that involve 5-membered chelates are inactive in this transformation. Computational studies suggest that the C(sp(3))-H bond activation is the rate-limiting step in both cases. The C(sp(3))-H bond activation with a 5-membered chelate is unfavorable by 7.7 kcal/mol compared to the corresponding 6-membered chelate with Pd(II)...
June 3, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28577303/hhex-regulates-hematopoietic-stem-cell-self-renewal-and-stress-hematopoiesis-via-repression-of-cdkn2a
#13
Jacob T Jackson, Benjamin J Shields, Wei Shi, Ladina Di Rago, Donald Metcalf, Nicos A Nicola, Matthew P McCormack
The Hematopoietically-expressed homeobox transcription factor (Hhex) is important for the maturation of definitive hematopoietic progenitors and B-cells during development. We have recently shown that in adult hematopoiesis, Hhex is dispensable for maintenance of hematopoietic stem cells (HSCs) and myeloid lineages but essential for the commitment of Common Lymphoid Progenitors (CLPs) to lymphoid lineages. Here we show that during serial bone marrow transplantation, Hhex-deleted HSCs are progressively lost, revealing an intrinsic defect in HSC self-renewal...
June 2, 2017: Stem Cells
https://www.readbyqxmd.com/read/28577123/hepatic-disease-with-portal-hypertension-and-acute-juvenile-paracoccidioidomycosis-a-report-of-two-cases-and-literature-review
#14
REVIEW
Priscila Marques de Macedo, Rodrigo Almeida-Paes, Dayvison Francis Saraiva Freitas, Fabio Brito-Santos, Maria Helena Galdino Figueiredo-Carvalho, João Carlos de Almeida Soares, Andrea D'Ávila Freitas, Rosely Maria Zancopé-Oliveira, Antonio Carlos Francesconi do Valle
Paracoccidioidomycosis (PCM) is a neglected systemic mycosis endemic to Latin America caused by dimorphic fungi of the genus Paracoccidioides. The acute juvenile PCM is a severe type of presentation that usually affects young vulnerable patients and rarely progresses to portal hypertension. Here, two cases of liver disease and portal hypertension as complications of acute juvenile PCM are reported. Diagnosis of PCM was performed by isolation of the fungus and molecular identification of the strains provided through partial sequencing of two protein encoding genes, arf and gp43...
June 2, 2017: Mycopathologia
https://www.readbyqxmd.com/read/28576567/developing-a-data-sharing-community-for-spinal-cord-injury-research
#15
REVIEW
Alison Callahan, Kim D Anderson, Michael S Beattie, John L Bixby, Adam R Ferguson, Karim Fouad, Lyn B Jakeman, Jessica L Nielson, Phillip G Popovich, Jan M Schwab, Vance P Lemmon
The rapid growth in data sharing presents new opportunities across the spectrum of biomedical research. Global efforts are underway to develop practical guidance for implementation of data sharing and open data resources. These include the recent recommendation of 'FAIR Data Principles', which assert that if data is to have broad scientific value, then digital representations of that data should be Findable, Accessible, Interoperable and Reusable (FAIR). The spinal cord injury (SCI) research field has a long history of collaborative initiatives that include sharing of preclinical research models and outcome measures...
May 30, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/28575401/localization-of-arabidopsis-forked1-to-a-raba-positive-compartment-suggests-a-role-in-secretion
#16
Neema Prabhakaran Mariyamma, Hongwei Hou, Francine M Carland, Timothy Nelson, Elizabeth A Schultz
When FORKED1 (FKD1) is mutated, asymmetric localization of PINFORMED1 (PIN1), particularly to the apical side of cells, fails to occur properly in developing veins, resulting in an open vein pattern. FKD1 encodes a protein with a Pleckstrin homology-like (PL) domain, suggesting interaction with phosphoinositides. FKD1 has been previously found to interact with an ADP ribosylation factor GTPase-activating protein (ARF-GAP) important for vein patterning, SCARFACE/VAN3 (SFC). We find that FKD1-green fluorescent protein (GFP) localizes to the plasma membrane and to punctae labeled by SFC-yellow fluorescent protein (YFP)...
June 1, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28573642/aberrant-gene-promoter-methylation-of-e-cadherin-p16-ink4a-p14-arf-and-mgmt-in-epstein-barr-virus-associated-oral-squamous-cell-carcinomas
#17
Ati Burassakarn, Chamsai Pientong, Nuchsupha Sunthamala, Jureeporn Chuerduangphui, Patravoot Vatanasapt, Natcha Patarapadungkit, Bunkerd Kongyingyoes, Tipaya Ekalaksananan
The etiology of oral carcinogenesis appears to be multifactorial. There is emerging evidence of the presence of Epstein-Barr virus (EBV) in epithelial oral squamous cell carcinoma (OSCC), but an association of EBV with oral carcinogenesis has not yet been established. Although epigenetic alterations, such as aberrant DNA methylation, are known to contribute to the pathogenesis of oral cancer, the relationship of such alterations with EBV infection is little known. This study aimed to investigate the association between EBV infection and promoter methylation patterns of tumor-associated genes in OSCC tissues...
July 2017: Medical Oncology
https://www.readbyqxmd.com/read/28564273/kidney-transplantation-from-donors-with-rhabdomyolysis-and-acute-renal-failure
#18
Chuan-Bao Chen, Yi-Tao Zheng, Jian Zhou, Ming Han, Xiao-Ping Wang, Xiao-Peng Yuan, Chang-Xi Wang, Xiao-Shun He
Rhabdomyolysis in deceased donors usually causes acute renal failure (ARF), which may be considered a contraindication for kidney transplantation. From January 2012 to December 2016, 30 kidneys from 15 deceased donors with severe rhabdomyolysis and ARF were accepted for transplantation at our center. The peak serum creatinine kinase, myoglobin, and serum creatinine of the these donors was 15569 ± 8597 U/L, 37092 ± 42100 μg/L, and 422 ± 167 μmol/L, respectively. Two donors received continuous renal replacement therapy due to anuria...
May 31, 2017: Clinical Transplantation
https://www.readbyqxmd.com/read/28545045/differences-in-speb-protease-activity-among-group-a-streptococci-associated-with-superficial-invasive-and-autoimmune-disease
#19
Anhphan T Ly, John P Noto, Odaelys L Walwyn, Robert R Tanz, Stanford T Shulman, William Kabat, Debra E Bessen
The secreted cysteine proteinase SpeB is an important virulence factor of group A streptococci (GAS), whereby SpeB activity varies widely among strains. To establish the degree to which SpeB activity correlates with disease, GAS organisms were recovered from patients with pharyngitis, impetigo, invasive disease or acute rheumatic fever (ARF), and selected for analysis using rigorous sampling criteria; >300 GAS isolates were tested for SpeB activity by casein digestion assays, and each GAS isolate was scored as a SpeB-producer or non-producer...
2017: PloS One
https://www.readbyqxmd.com/read/28542655/-risk-factors-associated-with-postoperative-acute-renal-failure-in-pediatric-patients-undergoing-cardiopulmonary-bypass-surgery
#20
Elsa Nohemí Reyes-Flandes, Alejandro Herrera-Landero, Pascual Bobadilla-González, Juan Carlos Núñez-Enríquez
Acute renal failure (ARF) is a complication associated with cardiac surgery with cardiopulmonary bypass (CPB) with an impact on morbidity and mortality. OBJECTIVE: To identify risk factors associated with postoperative IRA according to pediatric Risk, Injury, Failure, Loss, End-Stage Renal Disease scale in children undergoing cardiac surgery with CPB. PATIENTS AND METHOD: A nested case-control study was conducted. We included children under 16 years of age attended postoperative for CBP in a pediatric intensive care unit over a period of 18 months...
April 2017: Revista Chilena de Pediatría
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