Extracellular nanovesicles‐transmitted circular RNA has_circ_0000190 suppresses osteosarcoma progression

Under the microenvironment, tumour progression is substantially affected by cell‐cell communication. In spite of the mediating effect of extracellular nanovesicles (EVs) on cell‐cell communication by packaging into circRNAs, the effect of EVs circRNA hsa_circ_0000190 (circ‐0000190) in osteosarcoma is still not clear. Circ‐0000190 expressions in tissues and EVs from plasma were compared between osteosarcoma patients and controls. Thereafter, receiver operating characteristic (ROC) curve was drawn and area under the curve was calculated to examine whether the diagnostic results were accurate, and the effect of EVs circ‐0000190 was dug out via the determination of cell phenotypes and animal assays. Results showed circ‐0000190 exhibited an obvious reduction in EVs and tissues of osteosarcoma patients (P < .05). It was also discovered that EVs encapsulated the majority of circ‐0000190, and EVs‐encapsulated circ‐0000190 could be applied to make a distinction between osteosarcoma patients and controls. Besides, EVs circ‐0000190 in osteosarcoma cells transported from normal cells weakened the capacities of osteosarcoma cells to migrate, proliferate and invade, so as to block their biological malignant behaviours (P < .05). In addition, under the action of EVs circ‐0000190, tumour growth was impeded and the expression of TET1 was inhibited via the competitive binding to miR‐767‐5p. In all, EVs circ‐0000190 has a good prospect as it can be regarded as a new biomarker for detecting osteosarcoma. EVs circ‐0000190 transported from normal cells to osteosarcoma cells impeded the in vitro and in vivo development of osteosarcoma, implying that EVs circ‐0000190 exerts an effect on communication between normal cells and osteosarcoma cells in the carcinogenesis process of osteosarcoma.     

Methylation-mediated miR-214 regulates proliferation and drug sensitivity of renal cell carcinoma cells through targeting LIVIN

LIVIN, a member of the inhibitor of apoptosis proteins (IAPs), is reported playing important roles in the development and progression of multiple human cancers. However, its underlined mechanisms in human renal cell carcinoma (RCC) are still needed to be clarified. In the present study, we reported that inhibition of miR-214 promoted the expression of LIVIN, then facilitated RCC cells growth and reduced the sensitivity of RCC cells to chemotherapeutic drugs. In constant, overexpression of miR-214 had contradictory effects. Further investigation showed that miR-214 was down-regulated in RCC because of abnormal methylation. In addition, DNA methyltransferase DNMT1, miR-214 and LIVIN are directly correlated in RCC patients. In conclusion, these results suggest that abnormal miR-214 methylation negatively regulates LIVIN, which may promote RCC cells growth and reduced the sensitivity of RCC cells to chemotherapeutic drugs.     

Accurate Control Multiple Active Sites of Carbonaceous Anode for High Performance Sodium Storage: Insights into Capacitive Contribution Mechanism

Heteroatom doping is widely recognized as an appealing strategy to break the capacitance limitation of carbonaceous materials toward sodium storage. However, the concrete effects, especially for heteroatomic phase transformation, during the sodium storage reaction remain a confusing topic. Here, a novel hypercrosslinked polymerization approach is demonstrated to fabricate pyrrole/thiophene hypercrosslinked microporous copolymer and further give porous carbonaceous materials with accurately regulated N/S dual doping corresponding to starting feeding ratios. Significantly, the N doping contributes to the conductivity and surface wettability, while the S doping is bridged to build stable active sites, which can be electrochemically converted into mercaptan anions via faraday reaction and further enhancing reversible capacities. Meanwhile, the abundant S doping can also conduce to the expanded interlayer spacing to shorten the ions diffusion distance, thus optimizing the reaction kinetic. As a result, the N_0.2S_0.8‐micro‐dominant porous carbon delivers the highest reversible capacity of 521 mAh g^?1 at 100 mA g^?1 and excellent cyclic stability over 2000 cycles at 2000 mA g^?1 with a capacity decay of 0.0145 mAh g^?1 per cycle. This work is anticipated to provide an in‐depth understanding of capacitance contribution and illuminate the heteroatomic phase transformation during sodium storage reactions for doping carbonaceous anodes.     

Boosting Superior Lithium Storage Performance of Alloy‐Based Anode Materials via Ultraconformal Sb Coating–Derived Favorable Solid‐Electrolyte Interphase

Alloy materials such as Si and Ge are attractive as high‐capacity anodes for rechargeable batteries, but such anodes undergo severe capacity degradation during discharge–charge processes. Compared to the over‐emphasized efforts on the electrode structure design to mitigate the volume changes, understanding and engineering of the solid‐electrolyte interphase (SEI) are significantly lacking. This work demonstrates that modifying the surface of alloy‐based anode materials by building an ultraconformal layer of Sb can significantly enhance their structural and interfacial stability during cycling. Combined experimental and theoretical studies consistently reveal that the ultraconformal Sb layer is dynamically converted to Li₃Sb during cycling, which can selectively adsorb and catalytically decompose electrolyte additives to form a robust, thin, and dense LiF‐dominated SEI, and simultaneously restrain the decomposition of electrolyte solvents. Hence, the Sb‐coated porous Ge electrode delivers much higher initial Coulombic efficiency of 85% and higher reversible capacity of 1046 mAh g^?1 after 200 cycles at 500 mA g^?1, compared to only 72% and 170 mAh g^?1 for bare porous Ge. The present finding has indicated that tailoring surface structures of electrode materials is an appealing approach to construct a robust SEI and achieve long‐term cycling stability for alloy‐based anode materials.     

Achieving Balanced Crystallization Kinetics of Donor and Acceptor by Sequential‐Blade Coated Double Bulk Heterojunction Organic Solar Cells

Sequential deposition has great potential to achieve high performance in organic solar cells due to the resulting well‐controlled vertical phase separation. In this work, double bulk heterojunction organic solar cells are fabricated by sequential‐blade cast in ambient conditions. Probed by the in situ grazing incidence X‐ray diffraction and in situ UV–vis absorption measurements, the seq‐blade system exhibits a different tendency from each of the binary films during the film formation process. Due to the extensive aggregation of FOIC, the binary PBDB‐T:FOIC film displays a strong and large phase separation, resulting in low current density (J_sc) and unsatisfactory power conversion efficiency. In the seq‐blade cast system, the bottom layer PBDB‐T:IT‐M produces many crystal nuclei for the top layer PBDB‐T:FOIC, so the PBDB‐T molecules are able to crystallize easily and quickly. Balanced crystallization kinetics between polymer and small molecule and an ideal percolation network in the film are observed. In addition, the balanced crystallization kinetics are favorable toward realizing lower recombination loss through charge transport processes.     

乳腺癌患者改良根治术后生活质量调查及复发转移的影响因素分析

目的:调查乳腺癌患者改良根治术后生活质量,并对其复发转移的影响因素进行分析。方法:选取2012年6月～2014年6月期间于我院行改良根治术的乳腺癌患者197例,于术后3个月、术后6个月、术后12个月采用乳腺癌患者生命质量测定量表(FACT-B)评价患者生活质量。采用我院自制的调查问卷统计患者基本治疗情况,分析乳腺癌改良根治术后复发转移的影响因素。结果:本研究中,共发放197份问卷调查,回收195份,回收率为98.98%(195/197)。其中195例患者中有73例发生复发转移(复发转移组),122例未发生复发转移(未复发转移组)。195例乳腺癌患者术后3个月、术后6个月、术后12个月社会/家庭状况、生理状况、功能状况、情感状况、附加关注条目、总体生活质量等项目评分呈递增趋势(P0.05)。多因素Logistic回归分析显示,病理类型为浸润性非特殊性癌、肿瘤大小≥2 cm、临床分期为Ⅲ期、激素受体为ER及PR均阴性均是乳腺癌改良根治术后复发转移的独立危险因素(P0.05),而采用放化疗、联合化疗方案、内分泌治疗以及p53蛋白阳性表达是乳腺癌改良根治术后复发转移的独立保护因素(P0.05)。结论:乳腺癌患者行改良根治术后生活质量呈动态变化,其术后复发转移影响因素为病理类型、临床分期、肿瘤大小、激素受体、化疗方案、p53蛋白、内分泌治疗及放化疗。     

经会阴二维超声对自然分娩女性产后盆底三腔室运动和早期盆底功能的评估价值

目的:探讨经会阴二维超声对自然分娩女性产后盆底三腔室运动和早期盆底功能的评估价值。方法:选取2019年2月～2019年7月于我院进行自然分娩的产妇284例作为研究组,另选取同期于我院接受诊治的未育女性200例作为对照组。两组均进行经会阴二维超声检查,比较两组静息期、张力期、缩肛期的肛管直肠连接部(ARJ)、宫颈外口(CV)、尿道膀胱连接部(UVJ)的位置及运动变化情况,对比两组静息状态下以及最大Valsaval动作下盆底超声参数。结果:研究组静息期、张力期、缩肛期的CV距离水平参照线的垂直长度(CV-VD)、UVJ距离水平参照线的垂直长度(UVJ-VD)均低于对照组(均P0.05)。研究组张力期对应静息期垂直长度△r-s CV-VD、△r-s UVJ-VD均高于对照组,而缩肛期对应静息期垂直长度△r-s CV-VD、△r-s UVJ-VD均低于对照组(均P0.05)。研究组静息状态下膀胱颈位置(BNP)低于对照组,而膀胱尿道后角(PUA)高于对照组(均P0.05);研究组最大Valsaval动作下膀胱颈移动度(BND)、PUA、尿道旋转角(URA)均高于对照组(均P0.05)。结论:经会阴二维超声可对自然分娩女性产后盆底三腔室运动和早期盆底功能进行有效观察,有助于评估女性盆底结构、功能变化,具有一定的临床推广应用价值。     

Long-Term Existence of SARS-CoV-2 in COVID-19 Patients: Host Immunity,Viral Virulence,and Transmissibility

Virologica Sinica - COVID-19 patients can recover with a median SARS-CoV-2 clearance of 20&nbsp;days post initial symptoms (PIS). However, we observed some COVID-19 patients with existing...