bluuebunny/crossref_metadata_2025 huggingface dataset:
Emergency retroperitoneal laparoscopic partial nephrectomy for ruptured renal angiomyolipomas: a retrospective single-center series of 15 cases
Authors: He Wei , Chen Xiaoxu , Ji Haiyong , Wang Jianwei , Niu Zhihong
Published: March 2020

Background

To assess the safety, tumor control and renal function preservation of the emergency retroperitoneal laparoscopic partial nephrectomy (LPN) for ruptured renal angiomyolipoma (AML) and summarize our single-center initial experience.

Methods

We performed a retrospective analysis of 15 patients pathologically confirmed renal AML treated with emergency retroperitoneal LPN between January 2016 and May 2019. The patient demographics, operation time, blood loss, transfusion requirements, complications and other surgical parameters were analyzed. Follow-up was performed by serum creatinine and imaging modalities.

Results

Fifteen patients were performed with emergency LPN with the median age 41.6 years. The mean size of the renal AMLs was 7.8 cm. The mean size of the retroperitoneal hematomas was 8.5 cm. All the emergency surgeries were performed successfully without any conversion to nephrectomy or open surgery. The mean operative time was 101 min. The mean warm ischemia time was 28 min. The mean estimated blood loss was 311 ml. Five patients required intraoperative blood transfusion (33.3%, 5/15). The mean transfused RBC was 4 U (range 2-6 U), and the mean transfused plasma was 200 ml (range 200-400 ml). The mean drainage duration was 3 days (range 2–5 days). The mean postoperative hospitalization was 4.7 days. No patients experienced intraoperative complications. The mean serum creatine was slightly higher after surgery (53.1 vs. 55.9 μmol/L). One patient had postoperative perirenal fluid collection. No patients needed dialysis. No recurrence was observed in the patients at the median follow-up of 24.1 months.

Conclusions

Our initial experience shows that the emergency retroperitoneal LPN is a safe, minimally invasive procedure for emergency patients with ruptured renal AMLs. It could be considered as an effective alternative to renal artery embolization in selected emergency patients.
Generation of an engineered food-grade Lactococcus lactis strain for production of an antimicrobial peptide: in vitro and in silico evaluation
Authors: Tanhaeian Abbas , Mirzaii Mehdi , Pirkhezranian Zana , Sekhavati Mohammad Hadi
Published: March 2020

Background

Foodborne pathogens and their biofilms are considered as one of the most serious problems in human health and food industry. Moreover, safety of foods is a main global concern because of the increasing use of chemical food additives. Ensuring food safety enhances interest in discovery of new alternative compounds such as antimicrobial peptides (AMPs), which can be used as bio-preservatives in the food industry. In this study, the most important antimicrobial peptides of camel milk lactoferrin (lactoferrampin and lactoferricin) were recombinantly expressed in the form of chimeric peptide (cLFchimera) in a food-gradeL. lactisstrain. P170 expression system was used to express secreted cLFchimera using pAMJ1653 expression vector which harbors a safe (non-antibiotic) selectable marker.

Results

Peptide purification was carried out using Ni-NTA agarose column from culture medium with concentration of 0.13 mg/mL. The results of disk diffusion test revealed that cLFchimera had considerable antimicrobial activity against a number of major foodborne bacteria. Furthermore, this chimeric peptide showed strong and weak inhibitory effect on biofilm formation againstP. aeruginosa,S. aureus E. faecalis,andE. coli,respectively. Antioxidant activity and thermal stability of the chimeric peptide was determined. The results showed that cLFchimera had antioxidant activity (IC50: 310 μ/mL) and its activity was not affected after 40 min of boiling. Finally, we evaluated the interaction of the peptide with LPS and DNA in bacteria using molecular dynamic simulation as two main intra and extra cellular targets for AMPs, respectively. Our in silico analysis showed that cLFchimera had strong affinity to both of these targets by positive charged residues after 50 ns molecular dynamic simulation.

Conclusions

Overall, the engineered food-gradeL. lactisgenerated in the present study successfully expressed a secreted chimeric peptide with antimicrobial properties and could be considered as a promising bio-preservative in the food industry.
Increased soil moisture aggravated the competitive effects of the invasive tree Rhus typhina on the native tree Cotinus coggygria
Authors: Guo Xiao , Xu Zhen-Wei , Li Ming-Yan , Ren Xiao-Huang , Liu Jian , Guo Wei-Hua
Published: March 2020

Background

Invasive exotic species have caused significant problems, and the effects of extreme precipitation and drought, which might occur more frequently under the global climate change scenarios, on interspecific relationship between invasive and native species remain unclear.

Results

We conducted a greenhouse experiment with three soil water levels (30–40%, 50–60%, and 70–80% of field capacity) and two cultivation treatments (monoculture pots, one seedling of either species and mixture pots, one seedling of each species) to investigate soil water content effects on the relationship between invasiveRhus typhinaand nativeCotinus coggygria.Rhus typhinahad lower height but bigger crown area thanC. coggygriain the monoculture treatment.Rhus typhinahad higher height, bigger crown area and total biomass thanC. coggygriain the mixture treatment. Drought decreased the growth parameters, total chlorophyll concentration, and leaf biomass, but did not change gas exchange and other biomass parameters inR. typhina. The growth parameters, leaf area index, biomass parameters, total chlorophyll concentration, and net photosynthetic rate ofC. coggygriadecreased under drought conditions. The log response ratio (lnRR), calculated as ln (total biomass of a target plant grown in monoculture/total biomass of a target plant grown in mixed culture), ofR. typhinawas lower than that ofC. coggygria. The lnRR ofR. typhinaandC. coggygriadecreased and increased with increase in soil water content, respectively.

Conclusions

Rhus typhinahas greater capacity to relatively stable growth to the drought condition thanC. coggygriaand has strong competition advantages in the mixture withC. coggygria, especially in the drought condition. Our study will help understand the causes of invasiveness and wide distribution ofR. typhinaunder various moisture conditions and predict its expansion under climate change scenarios.
Outcomes after long-term mechanical ventilation of cancer patients
Authors: Haviland Kelly , Tan Kay See , Schwenk Nadja , Pillai Manju V. , Stover Diane E. , Downey Robert J.
Published: March 2020

Background

The probability of weaning and of long-term survival of chronically mechanically ventilated cancer patients is unknown, with incomplete information available to guide therapeutic decisions. We sought to determine the probability of weaning and overall survival of cancer patients requiring long-term mechanical ventilation in a specialized weaning unit.

Methods

A single-institution retrospective review of patients requiring mechanical ventilation outside of a critical care setting from 2008 to 2012 and from January 1 to December 31, 2018, was performed. Demographic and clinical data were recorded, including cancer specifics, comorbidities, treatments, and outcomes. Overall survival was determined using the Kaplan-Meier approach. Time to weaning was analyzed using the cumulative incidence function, with death considered a competing risk. Prognostic factors were evaluated for use in prospective evaluations of weaning protocols.

Results

Between 2008 and 2012, 122 patients required mechanical ventilation outside of a critical care setting with weaning as a goal of care. The cumulative incidence of weaning after discharge from the intensive care unit was 42% at 21 days, 49% at 30 days, 58% at 60 days, 61% at 90 days, and 61% at 120 days. The median survival was 0.16 years (95% CI, 0.12 to 0.33) for those not weaned and 1.05 years (95% CI, 0.60 to 1.34) for those weaned. Overall survival at 1 year and 2 years was 52 and 32% among those weaned and 16 and 9% among those not weaned. During 2018, 36 patients at our institution required mechanical ventilation outside of a critical care setting, with weaning as a goal of care. Overall, with a median follow-up of 140 days (range, 0–425 days; average, 141 days), 25% of patients requiring long-term mechanical ventilation (9 of 36) are alive.

Conclusions

Cancer patients can be weaned from long-term mechanical ventilation, even after prolonged periods of support. Implementation of a resource-intensive weaning program did not improve rates of successful weaning. No clear time on mechanical ventilation could be identified beyond which weaning was unprecedented. Short-term overall survival for these patients is poor.
Helping women veterans quit smoking: a qualitative analysis of successful and unsuccessful attempts
Authors: Berg Kristin M. , Gruber Stephanie J. , Jorenby Douglas E.
Published: March 2020

Background

Tobacco use is the number one cause of death and disability of women in the United States, and our women Veteran population is disproportionately affected. Despite revisions to the Veterans Affairs’ approach to smoking cessation, women continue to smoke at equal or higher rates than men, are prescribed cessation medications less frequently, and are less likely to quit. In this qualitative pilot study, individual interviews with women Veterans revealed their experiences with smoking cessation attempts.

Methods

The lead author conducted semi-structured interviews with 14 women Veterans who were either current or former smokers. Participants gave a narrative account of recent quit smoking attempts. Inductive thematic analysis explored the underlying themes.

Results

Four main themes emerged as important: health and well-being, smoking as an addiction, optimism, and resilience. Health and well-being encompassed physical health, mental health, and financial stability. Women often felt that stability in these key areas made a successful attempt possible. Women with successful quit attempts were more likely to consider tobacco use as an addiction, as well as expressed optimism about their quit attempts. Women with successful quit attempts also demonstrated more resilience to lapses and relapses.

Conclusions

Women Veterans’ quit smoking attempts demonstrate four main themes: baseline health and wellbeing, acknowledging smoking as an addiction, the participant’s optimism towards quitting, and resilience. Patterns were observed within themes with respect to whether the woman was currently quit or had experienced a prolonged quit attempt in the past. Further research is needed to help women Veterans quit smoking.
A mechanistic approach to HPLC analysis, antinociceptive, anti-inflammatory and postoperative analgesic activities of panch phoron in mice
Authors: Gias Zarin Tasnim , Afsana Fatima , Debnath Polak , Alam M. Shadidul , Ena Tania Naz , Hossain Md Hemayet , Jain Preeti , Reza Hasan Mahmud
Published: March 2020

Background

Panch phoron is a mixture of five spices containing an equal proportion ofFoeniculum vulgare(fennel),Trigonella foenum-graecum Linn(fenugreek),Nigella sativa(black cumin),Cuminum cyminum(cumin) andBrassica nigra(black mustard). The mixture is commonly used in Bangladeshi cuisine and possesses many pharmacological effects. In this study, we evaluated the antinociceptive and anti-inflammatory activities of aqueous panch phoron extract (PPE) in vivo, its possible mechanism of action and phytochemical analysis by High-Performance Liquid Chromatography (HPLC). We also investigated the effect of PPE on postoperative pain in mice.

Methods

HPLC was carried out using LC-20A Modular HPLC system to identify the bioactive compounds present in PPE. Five groups of Swiss albino male mice (n = 6 per group) were orally treated with 10 ml/kg of distilled water or 10 mg/kg of sodium diclofenac or three doses of PPE (100 mg/kg, 300 mg/kg, 500 mg/kg). In vivo assessment was carried out by the writhing test, tail-flick test, formalin test, and carrageenan induced paw edema test. The opioid antagonist, naloxone was used in the acetic acid test to evaluate the involvement of opioid receptors. To assess the effect of PPE in postoperative pain, mice that underwent sciatic nerve surgery were measured for the paw withdrawal latency in a hot water bath.

Results

In HPLC analysis, different types of phenolic compounds and flavonoids, including catechin hydrate, para-coumaric acid, vanillic acid, and syringic acid were detected. Treatment with PPE exhibited dose-dependent antinociceptive and anti-inflammatory activities in pain models (p < 0.05). Furthermore, naloxone did not reverse the effect of PPE in the writhing test. Mice that underwent sciatic nerve surgery showed that the paw withdrawal latency increased gradually over 7 days.

Conclusions

Our results demonstrate that PPE has significant antinociceptive and anti-inflammatory activities and can provide significant postoperative analgesia.
Preferences of nursing and medical students for working with older adults and people with dementia: a systematic review
Authors: Hebditch Molly , Daley Stephanie , Wright Juliet , Sherlock Gina , Scott James , Banerjee Sube
Published: March 2020

Background

A current issue in workforce planning is ensuring healthcare professionals are both competent and willing to work with older adults with complex needs. This includes dementia care, which is widely recognised as a priority. Yet research suggests that working with older people is unattractive to undergraduate healthcare students.

Methods

The aim of this systematic review and narrative synthesis is to explore the factors related to healthcare (medical and nursing) student preferences’ for working with older people and people with dementia. Searches were conducted in five databases: MEDLINE, PsycINFO, CINHAL, BNI, ERIC. Screening, data extraction and quality appraisal were conducted by two independent reviewers. A narrative, data-based convergent synthesis was conducted.

Results

One thousand twenty-four papers were screened (139 full texts) and 62 papers were included for a narrative synthesis. Factors were grouped into seven categories; student characteristics, experiences of students, course characteristics, career characteristics, patient characteristics, work characteristics and the theory of planned behaviour.

Conclusion

Health educators should review their role in cultivating student interest in working with older adults, with consideration of student preparation and the perceived value of this work. There is a lack of evidence about the career preferences of students in relation to dementia, and this warrants further research.
A systematic review of the factors – enablers and barriers – affecting e-learning in health sciences education
Authors: Regmi Krishna , Jones Linda
Published: March 2020

Background

Recently, much attention has been given to e-learning in higher education as it provides better access to learning resources online, utilising technology – regardless of learners’ geographical locations and timescale – to enhance learning. It has now become part of the mainstream in education in the health sciences, including medical, dental, public health, nursing, and other allied health professionals. Despite growing evidence claiming that e-learning is as effective as traditional means of learning, there is very limited evidence available about what works, and when and how e-learning enhances teaching and learning. This systematic review aimed to identify and synthesise the factors – enablers and barriers – affecting e-learning in health sciences education (el-HSE) that have been reported in the medical literature.

Methods

A systemic review of articles published on e-learning in health sciences education (el-HSE) was performed in MEDLINE, EMBASE, Allied & Complementary Medicine, DH-DATA, PsycINFO, CINAHL, and Global Health, from 1980 through 2019, using ‘Textword’ and ‘Thesaurus’ search terms. All original articles fulfilling the following criteria were included: (1) e-learning was implemented in health sciences education, and (2) the investigation of the factors – enablers and barriers – about el-HSE related to learning performance or outcomes. Following the PRISMA guidelines, both relevant published and unpublished papers were searched. Data were extracted and quality appraised using QualSyst tools, and synthesised performing thematic analysis.

Results

Out of 985 records identified, a total of 162 citations were screened, of which 57 were found to be of relevance to this study. The primary evidence base comprises 24 papers, with two broad categories identified, enablers and barriers, under eight separate themes: facilitate learning; learning in practice; systematic approach to learning; integration of e-learning into curricula; poor motivation and expectation; resource-intensive; not suitable for all disciplines or contents, and lack of IT skills.

Conclusions

This study has identified the factors which impact on e-learning: interaction and collaboration between learners and facilitators; considering learners’ motivation and expectations; utilising user-friendly technology; and putting learners at the centre of pedagogy. There is significant scope for better understanding of the issues related to enablers and facilitators associated with e-learning, and developing appropriate policies and initiatives to establish when, how and where they fit best, creating a broader framework for making e-learning effective.
A critical review of representation in the development of global oncology curricula and the influence of neocolonialism
Authors: Giuliani Meredith , Frambach Janneke , Broadhurst Michaela , Papadakos Janet , Fazelad Rouhi , Driessen Erik , Martimianakis Maria Athina Tina
Published: March 2020

Background

Global curricular homogenization is purported to have a multitude of benefits. However, homogenization, as typically practiced has been found to promote largely Western ideals. The purpose of this study was to explore the issue of representation in the development of global oncology curricula.

Methods

This systematic review of global oncology curricula involved a comprehensive search strategy of eight databases from inception to December 2018. Where available, both controlled vocabulary terms and text words were used. Two investigators independently reviewed the publications for eligibility. Full global/core oncology curricular documents were included. Data analysis included exploration of representation across a number of axes of power including sex and geographic sector, consistent with a neocolonial approach.

Results

32,835 documents were identified in the search and 17 remained following application of the inclusion/exclusion criteria. Eleven of 17 papers were published from 2010 to 2018 and 13 curricula originated from Europe. The 17 curricula had 300 authors; 207 were male and most were from Europe (n = 190; 64%) or North America (n = 73; 24%). The most common curricular purposes were promoting quality patient care (n = 11), harmonization of training standards (n = 10), and facilitating physician mobility (n = 3). The methods for creation of these curricula were most commonly a committee or task force (n = 10). Over time there was an increase in the proportion of female authors and the number of countries represented in the authorship.

Conclusion

Existing global oncology curricula are heavily influenced by Western male authors and as a result may not incorporate relevant socio-cultural perspectives impacting care in diverse geographic settings.
Assessment of the impact of EHR heterogeneity for clinical research through a case study of silent brain infarction
Authors: Fu Sunyang , Leung Lester Y. , Raulli Anne-Olivia , Kallmes David F. , Kinsman Kristin A. , Nelson Kristoff B. , Clark Michael S. , Luetmer Patrick H. , Kingsbury Paul R. , Kent David M. , Liu Hongfang
Published: March 2020

Background

The rapid adoption of electronic health records (EHRs) holds great promise for advancing medicine through practice-based knowledge discovery. However, the validity of EHR-based clinical research is questionable due to poor research reproducibility caused by the heterogeneity and complexity of healthcare institutions and EHR systems, the cross-disciplinary nature of the research team, and the lack of standard processes and best practices for conducting EHR-based clinical research.

Method

We developed a data abstraction framework to standardize the process for multi-site EHR-based clinical studies aiming to enhance research reproducibility. The framework was implemented for a multi-site EHR-based research project, the ESPRESSO project, with the goal to identify individuals with silent brain infarctions (SBI) at Tufts Medical Center (TMC) and Mayo Clinic. The heterogeneity of healthcare institutions, EHR systems, documentation, and process variation in case identification was assessed quantitatively and qualitatively.

Result

We discovered a significant variation in the patient populations, neuroimaging reporting, EHR systems, and abstraction processes across the two sites. The prevalence of SBI for patients over age 50 for TMC and Mayo is 7.4 and 12.5% respectively. There is a variation regarding neuroimaging reporting where TMC are lengthy, standardized and descriptive while Mayo’s reports are short and definitive with more textual variations. Furthermore, differences in the EHR system, technology infrastructure, and data collection process were identified.

Conclusion

The implementation of the framework identified the institutional and process variations and the heterogeneity of EHRs across the sites participating in the case study. The experiment demonstrates the necessity to have a standardized process for data abstraction when conducting EHR-based clinical studies.
Practice of standard monitoring during anaesthesia in hospitals of North Kivu: a survey of health facilities of the health antenna of Butembo
Authors: Blaise Pascal Furaha Nzanzu , Musavuli Paulin Kambale , Ketha Joel Kambale , Sikakulya Franck Katembo , Barratt-Due Andreas , Castner Thomas , Pollach Gregor
Published: March 2020

Background

Standard monitoring during anaesthesia is a core element of patient safety and practice of safe anesthesia has reduced morbidity and mortality worldwide. The main objective of this study was to assess the practice of standard monitoring during anaesthesia in the hospitals of North Kivu, so as to establish a baseline overview of the situation, and orientate plans towards safe anaesthesia in the region.

Methods

This study was a cross-sectional survey of health facilities of the Health Antenna of Butembo in Democratic Republic of Congo and was conducted from October to December 2018. Questionnaires were brought to anaesthesia providers in the health facilities. The study included 1 answer from the anaesthesia practitioners who accepted to participate. The practices of standard monitoring in the health facilities were compared to WHO-WSFA guidelines. Data was captured and analyzed with Epi Info 7.

Results

Forty out of 90 health facilities (44.4%) of 10 health zones responded on the questionnaire. Twenty-three health facilities (57.5%) were from private sector and 17 (42.5%) from public sector. Sixteen health facilities (40.0%) were from the Butembo health zone. The median number of anaesthesia providers was 2 per health facility. Of all the anaesthesia providers, none were physicians, 47.5% were nurses practicing anaesthesia without any training in anaesthesia and 47.5% were nurse anaesthetists. All the health facilities were providing general anaesthesia whereas spinal anaesthesia was provided in 22 out of 40 centers (55%). Seventy percent (28/40) of the facilities were below standard according to WHO-WSFA guidelines. Only 40% (16/40) were using a pulse oximeter and 10% (4/40) declared that ECG was occasionally used.

Conclusion

The practice of standard monitoring is poor in health facilities of the Health Antenna of Butembo. Efforts should be made to improve monitoring which is a key element of safe anaesthesia.
Institutional delivery services utilization and its determinant factors among women who gave birth in the past 24 months in Southwest Ethiopia
Authors: Yoseph Metsehet , Abebe Solomon Mekonnen , Mekonnen Fantahun Ayenew , Sisay Mekonnen , Gonete Kedir Abdela
Published: March 2020

Background

Institutional delivery is a delivery that takes place at any medical facility staffed by skilled delivery assistance. It is estimated that using institutional delivery could reduce 16 to 33% of maternal deaths. Despite the importance of delivering at health institutions, in Ethiopia, mothers prefer to give birth at home. Therefore, the aim of this study was to compare institutional delivery service utilization and associated factors among rural and urban mothers in Mana district, Jimma Zone, Southwest Ethiopia, 2017.

Methods

A community based comparative cross sectional study was conducted in Mana district, Southwest Ethiopia from March to June, 2017. A stratified probability sampling technique was used to select a total of 1426 (713 urban, 713 rural) study participants. Data were collected from mothers who gave birth in the past 24 months by using a structured and pretested questionnaire.

Results

The overall prevalence of institutional delivery service utilization was 86.4%. Higher number of antenatal care visits, having good knowledge on the danger signs of labor, increased wealth index, primary and above educational level of the husband, mothers age below 40-year, and less than 30-min travel time to the nearby health institutions had significantly increased the rate of institutional delivery service utilization.

Conclusion

Institutional delivery service utilization is high in the study area. Maternal awareness of danger signs of labor, frequent ANC visit and better education of husband, and household wealth predicted the utilization of the service. Therefore, due attention need to be given to enhancing education, expanding health institutions and creating awareness on advantage of antenatal care follow up and danger signs to make all pregnancies delivered at health institutions.
Transcriptome analysis reveals the link between lncRNA-mRNA co-expression network and tumor immune microenvironment and overall survival in head and neck squamous cell carcinoma
Authors: Zhong Zhaoming , Hong Min , Chen Xiao , Xi Yan , Xu Yuanyuan , Kong Deyu , Deng Jun , Li Yun , Hu Rui , Sun Chuanzheng , Liang Jin
Published: March 2020

Background

As the sixth most common cancer worldwide, head and neck squamous cell carcinoma (HNSCC) develops visceral metastases during the advanced stage of the disease and exhibits a low five-year survival rate. The importance of tumor microenvironment (TME) in tumor initiation and metastasis is widely recognized. In addition, accumulating evidence indicates that long non-coding RNA (lncRNA) is involved in crosstalk between TME and tumor cells. However, the lncRNA-associated regulators modulating the HNSCC microenvironment and progression remain largely unknown.

Methods

The publicly available transcriptome data and matched clinical HNSCC data were collected from The Cancer Genome Atlas (TCGA). Immune scores (ISs) and stromal scores (SSs) of HNSCC TME were calculated using ESTIMATE algorithm. Weighted gene co-expression network analysis (WGCNA) was conducted to determine the co-expressed lncRNAs and protein-coding mRNAs.

Results

Results showed that the high IS HNSCC male patient subgroup exhibited improved survival. Additionally, we identified 169 lncRNAs and 825 protein-coding mRNAs that were differentially expressed in high IS HNSCC samples, with the up-regulated mRNAs displaying enrichment in immune-related biological processes. Notably, we identified a high co-expression lncRNA-mRNA module (i.e., purple module) that showed strong correlation with ISs. This module contained 79 lncRNAs and 442 mRNAs, including 26 lncRNAs and 215 mRNAs showing association between expression and male HNSCC survival. Consistently, 207 of the 215 mRNAs were up-regulated in high IS HNSCC group and were enriched in immune-related signaling pathways. Based on bioinformatics analyses and previous functional assays, certain lncRNAs (e.g., AL365361.1 and PCED1B-AS1) in the purple module likely contributed to the modification of tumor immune microenvironment (TIME) in the high IS HNSCC patients, achieved by regulating transcription of abundant immune-related genes (e.g., CCR7 and TLR8).

Conclusions

In summary, we ascertained a HNSCC male patient subgroup that displayed high ISs and good survival probability. We identified hundreds of genes with specific expression patterns in this HNSCC subgroup as well as a highly co-expressed lncRNA-mRNA module with great potential for the modulation of TIME of HNSCC. Our study provides evidence of a link between the lncRNA-associated gene network, TIME, and HNSCC progression, and highlights potential therapeutic targets for this disease.
RETRACTED ARTICLE: Down-regulation of LINC00472 promotes osteosarcoma tumorigenesis by reducing FOXO1 expressions via miR-300
Authors: Zhang Jingwei , Zhang Jieyuan , Zhang Dong , Ni Weifeng , Xiao Haijun , Zhao Bizeng
Published: March 2020

Background

Osteosarcoma (OS) is one of the most common types of primary bone tumors which poses negative effects on the bones of both young children and adolescents. LncRNA LINC00472 has been reported to be involved with poor prognostics in breast cancer and ovarian cancer. As a new lncRNA, its role in OS remains to be elusive. Herein, we are focused to explore its regulatory mechanism in the development of OS.

Methods

qRT-PCR was utilized to examine the expressions of LINC00472 and miR-300 in OS tissues and cell lines. OS cell lines of U2OS and MG63 were used to investigate the biological function of LINC00472. Xenograft tumor model was built in nude mice with MG63 cells.

Results

The expressions of LINC00472 were inhibited in OS tissues and cells, and were negatively related to the expressions of miR-300. LINC00472 directly targeted miR-300. FOXO1 was inhibited in OS tissues and its expressions were negatively related to the expressions of miR-300. LINC00472 over-expressions decreased cell proliferation abilities and colony formation abilities. These effects were mediated by miR-300. The silence of LINC00472 and over-expressions of miR-300 suppressed FOXO1 expressions. LINC00472 greatly reduced tumor growth in vivo and this effect was attenuated by miR-300 mimic.

Conclusions

From all the experiments and observations, we demonstrated that LINC00472 could be a potential tumor suppressor in OS through interacting with miR-300 and FOXO1.
ADAM10 promotes cell growth, migration, and invasion in osteosarcoma via regulating E-cadherin/β-catenin signaling pathway and is regulated by miR-122-5p
Authors: Yuan Quan , Yu Honghao , Chen Jianhua , Song Xiaoyu , Sun Li
Published: March 2020

Background

Osteosarcoma is a malignant bone tumor. Increasing evidences have revealed that a disintegrin and metalloproteinase 10 (ADAM10) is implicated in tumor development. The main purpose of this study is to explore the effects of ADAM10 on osteosarcoma cell functions and the underlying molecular mechanisms.

Methods

Western blot and quantitative real-time PCR were performed to detect the expression of ADAM10 in one osteoblast (hFOB 1.19) and six osteosarcoma cells (Saos-2, SW1353, HOS, U-2OS, MG63, and 143B). The biological functions of ADAM10 in osteosarcoma cells were measured by cell counting kit-8 assay, flow cytometry, wound healing assay, and transwell assay. The interaction between miR-122-5p and ADAM10 was validated using dual-luciferase reporter assay. The effect of ADAM10 on the tumorigenicity of osteosarcoma cells was evaluated in a nude mice model in vivo.

Results

We found that the expression of ADAM10 was relatively high in osteosarcoma cells compared with that in osteoblast. ADAM10 promoted osteosarcoma cell growth, migration, and invasion. Mechanism studies showed that knockdown of ADAM10 inactivated E-cadherin/β-catenin signaling pathway, as evidenced by increased the level of E-cadherin, reduced nuclear translocation of β-catenin, and decreased the levels of MMP-9, Cyclin D1, c-Myc, and Survivin. Downregulation of ADAM10 suppressed the tumorigenicity of osteosarcoma cells in vivo. Furthermore, ADAM10 was validated to be a downstream target of microRNA-122-5p (miR-122-5p). MiR-122-5p-induced inhibition of cell proliferation, migration, and invasion was reversed by overexpression of ADAM10 in osteosarcoma cells.

Conclusions

Collectively, the key findings of this study are that ADAM10 promotes osteosarcoma cell proliferation, migration, and invasion by regulating E-cadherin/β-catenin signaling pathway, and miR-122-5p can target ADAM10, indicating that miR-122-5p/ADAM10 axis might serve as a therapeutic target of osteosarcoma.
A pooled analysis of the prognostic value of PD-L1 in melanoma: evidence from 1062 patients
Authors: Yang Jing , Dong Meilian , Shui Yifang , Zhang Yue , Zhang Zhigang , Mi Yin , Zuo Xiaoxiao , Jiang Li , Liu Ke , Liu Zheyan , Gu Xiaobin , Shi Yonggang
Published: March 2020

Background

Programmed death-ligand 1 (PD-L1) was the first identified ligand of programmed death-1 (PD-1). PD-1/PD-L1 interactions inhibit T cell-mediated immune responses, limit cytokine production, and promote tumor immune escape. Recently, many studies have investigated the prognostic value of PD-L1 expression in patients with melanoma. However, the results of these analyses remain a subject of debate. We have therefore carried out a meta-analysis to identify the prognostic role of PD-L1 in melanoma.

Methods

A thorough medical literature search was performed in the databases PubMed, Web of Science, and Embase until October 2019. The pooled hazard ratios (HRs) and 95% confidence intervals (95% CIs) were calculated to evaluate the correlation between PD-L1 overexpression and prognosis. Publication bias was evaluated using Begg’s test and Egger’s test.

Results

Thirteen articles with 1062 enrolled patients were included in this meta-analysis. High PD-L1 expression did not correlate with overall survival (OS) (HR = 0.93, 95% CI 0.57–1.52, P = 0.781) or progression-free survival (PFS) (HR = 0.82, 95% CI 0.43–1.54, P = 0.535). However, PD-L1 overexpression correlated with the absence of lymph node (LN) metastasis (OR = 0.46, 95% CI 0.22–0.95, P = 0.036). Further, there was no significant relationship between PD-L1 expression and sex (OR = 1.29, 95% CI 0.90–1.84, P = 0.159), age (OR = 0.90, 95% CI 0.51–1.57, P = 0.708), or Eastern Cooperative Oncology Group Performance Status (OR = 0.55, 95% CI 0.06–4.83, P = 0.592).

Conclusions

This meta-analysis suggested that PD-L1 expression did not predict an inferior prognosis in patients with melanoma. However, high PD-L1 expression was associated with absence of LN metastasis in such patients.
Monitoring the physical and insecticidal durability of the long-lasting insecticidal net DawaPlus® 2.0 in three States in Nigeria
Authors: Obi Emmanuel , Okoh Festus , Blaufuss Sean , Olapeju Bolanle , Akilah Joel , Okoko Okefu Oyale , Okechukwu Abidemi , Maire Mark , Popoola Kehinda , Yahaya Muhammad Abdullahi , Uneke Chigozie Jesse , Awolola Samson , Pigeon Olivier , Babalola Stella , Koenker Hannah , Kilian Albert
Published: March 2020

Background

Following guidance from the US President’s Malaria Initiative, durability monitoring of DawaPlus® 2.0 brand of long-lasting insecticidal net (LLIN) distributed during the 2015/16 mass campaign was set up in three ecologically different states: Zamfara, Ebonyi and Oyo.

Methods

This was a prospective cohort study of representative samples of households from each location, recruited at baseline, 1 to 6 months after the mass campaign. All campaign nets in the households were labelled and followed up over a period of 36 months in Zamfara and Ebonyi and 24 months in Oyo. Primary outcome was the “proportion of nets surviving in serviceable condition” based on attrition and integrity measures and the median survival in years. The outcome for insecticidal durability was determined by bio-assay from sub-samples of campaign nets.

Results

A total of 439 households (98% of target) and 1096 campaign nets (106%) were included in the study. Definite outcomes could be determined for 92% of the cohort nets in Zamfara, 88% in Ebonyi and 75% in Oyo. All-cause attrition was highest in Oyo with 47% no longer present after 24 months, 53% in Ebonyi and 28% in Zamfara after 36 months. Overall only 1% of all campaign nets were used for other purposes. Estimated survival in serviceable condition of the campaign nets was 80% in Zamfara, 55% in Ebonyi (36 months follow-up) and 75% in Oyo (24 months follow-up) corresponding to median survival of 5.3, 3.3, 3.2 years, respectively. Factors associated with better survival were exposure to social messaging combined with a positive net-care attitude and only adult users. Failing to fold the net when hanging and having children under 5 years of age in the household negatively impacted net survival. Insecticidal effectiveness testing at final survey showed knock-down rates of 50–69%, but 24-h mortality above 95% resulting in 100% optimal performance in Ebonyi and Oyo and 97% in Zamfara.

Conclusions

Results confirm the strong influence of net-use environment and behavioural factors in the physical survival of the same LLIN brand, which can increase the time until 50% of nets are no longer serviceable by up to 2 years.
Optimization of parasite DNA enrichment approaches to generate whole genome sequencing data for Plasmodium falciparum from low parasitaemia samples
Authors: Shah Zalak , Adams Matthew , Moser Kara A. , Shrestha Biraj , Stucke Emily M. , Laufer Miriam K. , Serre David , Silva Joana C. , Takala-Harrison Shannon
Published: March 2020

Background

Owing to the large amount of host DNA in clinical samples, generation of high-quality Plasmodium falciparum whole genome sequencing (WGS) data requires enrichment for parasite DNA. Enrichment is often achieved by leukocyte depletion of infected blood prior to storage. However, leukocyte depletion is difficult in low-resource settings and limits analysis to prospectively-collected samples. As a result, approaches such as selective whole genome amplification (sWGA) are being used to enrich for parasite DNA. However, sWGA has had limited success in generating reliable sequencing data from low parasitaemia samples. In this study, enzymatic digestion with MspJI prior to sWGA and whole genome sequencing was evaluated to determine whether this approach improved genome coverage compared to sWGA alone. The potential of sWGA to cause amplification bias in polyclonal infections was also examined.

Methods

DNA extracted from laboratory-created dried blood spots was treated with a modification-dependent restriction endonuclease, MspJI, and filtered via vacuum filtration. Samples were then selectively amplified using a previously reported sWGA protocol and subjected to WGS. Genome coverage statistics were compared between the optimized sWGA approach and the previously reported sWGA approach performed in parallel. Differential amplification by sWGA was assessed by comparing WGS data generated from lab-created mixtures of parasite isolates, from the same geographical region, generated with or without sWGA.

Results

MspJI digestion did not enrich for parasite DNA. Samples that underwent vacuum filtration (without MspJI digestion) prior to sWGA had the highest parasite DNA concentration and displayed greater genome coverage compared to MspJI + sWGA and sWGA alone, particularly for low parasitaemia samples. The optimized sWGA (filtration + sWGA) approach was successfully used to generate WGS data from 218 non-leukocyte depleted field samples from Malawi. Sequences from lab-created mixtures of parasites did not show evidence of differential amplification of parasite strains compared to directly sequenced samples.

Conclusion

This optimized sWGA approach is a reliable method to obtain WGS data from non-leukocyte depleted, low parasitaemia samples. The absence of amplification bias in data generated from mixtures of isolates from the same geographic region suggests that this approach can be appropriately used for molecular epidemiological studies.
WHO malaria nucleic acid amplification test external quality assessment scheme: results of distribution programmes one to three
Authors: Cunningham Jane A. , Thomson Rebecca M. , Murphy Sean C. , de la Paz Ade Maria , Ding Xavier C. , Incardona Sandra , Legrand Eric , Lucchi Naomi W. , Menard Didier , Nsobya Samuel L. , Saez Agatha C. , Chiodini Peter L. , Shrivastava Jaya
Published: March 2020

Background

The World Health Organization (WHO) recommends parasite-based diagnosis of malaria. In recent years, there has been surge in the use of various kinds of nucleic-acid amplification based tests (NAATs) for detection and identification of Plasmodium spp. to support clinical care in high-resource settings and clinical and epidemiological research worldwide. However, these tests are not without challenges, including lack (or limited use) of standards and lack of reproducibility, due in part to variation in protocols amongst laboratories. Therefore, there is a need for rigorous quality control, including a robust external quality assessment (EQA) scheme targeted towards malaria NAATs. To this effect, the WHO Global Malaria Programme worked with the UK National External Quality Assessment Scheme (UK NEQAS) Parasitology and with technical experts to launch a global NAAT EQA scheme in January 2017.

Methods

Panels of NAAT EQA specimens containing five major species of human-infecting Plasmodium at various parasite concentrations and negative samples were created in lyophilized blood (LB) and dried blood spot (DBS) formats. Two distributions per year were sent, containing five LB and five DBS specimens. Samples were tested and validated by six expert referee laboratories prior to distribution. Between 37 and 45 laboratories participated in each distribution and submitted results using the online submission portal of UK NEQAS. Participants were scored based on their laboratory’s stated capacity to identify Plasmodium species, and individual laboratory reports were sent which included performance comparison with anonymized peers.

Results

Analysis of the first three distributions revealed that the factors that most significantly affected performance were sample format (DBS vs LB), species and parasite density, while laboratory location and the reported methodology used (type of nucleic acid extraction, amplification, or DNA vs RNA target) did not significantly affect performance. Referee laboratories performed better than non-referee laboratories.

Conclusions

Globally, malaria NAAT assays now inform a range of clinical, epidemiological and research investigations. EQA schemes offer a way for laboratories to assess and improve their performance, which is critical to safeguarding the reliability of data and diagnoses especially in situations where various NAAT methodologies and protocols are in use.
Classification of induced malaria case in an elimination setting: investigation of transfusion-transmitted malaria cases
Authors: Zhang Mei-hua , Xu Sui , Gu Ya-ping , Liu Yao-bao , Lin Hong , Xie Chao-yong , Chen Yue-e , Chen Jian-feng , Zhou Hua-yun , Ortega Leonard , Zhu Guo-ding , Cao Jun
Published: March 2020

Background

Since the National Malaria Elimination Action Plan was launched in China in 2010, local malaria transmission has decreased rapidly. Zero indigenous cases were reported since 2017. However, after 2010, the proportion of imported cases in China increased from 45.7% in 2010 to 99.9% in 2016, and almost all provinces of China have reported imported cases in recent years. Prevention of the reintroduction of malaria into China is crucial for the maintenance of its malaria-free status. Hence, it is of utmost importance to correctly identify the source of malaria infections within the country.

Case introduction and response

In 2016 and 2017, three laboratory-confirmed cases of malaria caused by Plasmodium falciparum were identified in patients with no previous travel history to endemic areas were reported in Jiangsu Province, China, where malaria due to P. falciparum was eliminated about 30 years ago. These were diagnosed after 41, 31 and 39 days of seeking treatment, respectively, and all of them had received blood transfusions. Further investigations indicated that two of the cases had received blood from foreign students (from Indonesia and Ghana), and the other had received blood from an individual who had worked in Equatorial Guinea. All three blood donors were traced, and found to be carrying asymptomatic P. falciparum infections by microscopic examination and PCR. Furthermore, five polymorphic microsatellite markers (C1M4, C4M62, C13M13, C14M17, and C13M63) were typed and used to link parasites from the donors with those of the transfusion-receiving patients.

Conclusions

Three transfusion-transmitted malaria cases were identified in China, all of which were due to the transfusion of blood donated by individuals who had contracted malaria outside the country. These cases can provide a reference for those faced with similar challenges in malaria case identification and classification in other regions. In addition, a stricter screening policy including the use of appropriate detection methods for malaria parasites should be developed and adopted for blood donation in regions undergoing malaria elimination.
RETRACTED ARTICLE: Molecular detection and quantification of Plasmodium falciparum gametocytes carriage in used RDTs in malaria elimination settings in northern Senegal
Authors: Guiguemde Kiswendsida Thierry , Dieye Yakou , Lô Aminata Collé , Ndiaye Magatte , Lam Aminata , Manga Isaac Akhénaton , Sow Gnagna Dieng , Diop Moussa , Souané Tamba , Diouf Marie Pièrre , Tine Roger Clément Kouly , Faye Babacar
Published: March 2020

Background

Malaria surveillance requires powerful tools and strategies to achieve malaria elimination. Rapid diagnostic tests for malaria (RDTs) are easily deployed on a large scale and are helpful sources of parasite DNA. The application of sensitive molecular techniques to these RDTs is a modern tool for improving malaria case detection and drug resistance surveillance. Several studies have made it possible to extract the DNA of Plasmodium falciparum from RDTs. The knowledge of gametocyte carriage in the population is important to better assess the level of parasite transmission in elimination settings. The aim of this study was to detect P. falciparum gametocytes from used RDTs by quantitative PCR for molecular monitoring of malaria transmission.

Methods

DNA was extracted from 303 RDT devices (SD Bioline Malaria Pf) using the Chelex-100 protocol. qPCR was performed in a 20 μL reaction to detect and quantify transcripts of the pfs25 gene. The cycle threshold (Ct) was determined by the emission fluorescence corresponding to the initial amount of amplified DNA.

Results

The study found an overall prevalence of 53.47% with an average Ct of 32.12 ± 4.28 cycles. In 2018, the prevalence of gametocytes was higher in the Ranérou district (76.24%) than in the Saint-Louis district (67.33%) where an increase in the number of gametocyte carriers in 2018 was noted, in comparison with 2017.

Conclusions

RDTs are a good source of DNA for molecular monitoring of gametocyte carriage. This method is a simple and effective tool to better understand the level of malaria transmission with a view to elimination.