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1. chinaXiv:202002.00078 [pdf]

Confirmed asymptomatic carrier of SARS-CoV-2

Luo, Sihui; Liu, Wei; Liu, Zhenjun; Zheng, Xueying; Ling, Ping; Ding, Yu; Hong, Changxing; Liu, Zhirong; Liu, Jian; Weng, Jianping
Subjects: Medicine, Pharmacy >> Clinical Medicine

Here we reported a case of asymptomatic carrier of SARS-CoV-2 infection. A 50-year old woman, lived with her husband in Anqing(Anhui, China) with no significant past medical history, travel history to Wuhan or adjacent area, or exposure to wild animals. She took throat swab test for SARS-CoV-2 nucleic acid due to her husband’s close contact with patients who had SARS-CoV-2 infection. Her results were confirmed positive on February 6, 2020. But she did not report elevation of temperature measurement, nor respiratory or gastrointestinal symptoms and her chest CT scan showed no significant abnormalities. She was hospitalized on February 6 and treated with antiviral agents. During her hospitalization, apart from a mild elevation of liver enzymes after 10-day treatment of lopinavir/ritonavir, she was asymptomatic, with her blood cell count, live and renal function largely normal. Her subcutaneous oxygen saturation stayed above 97%. Chest CT scan was repeated on February 11 and 20, and both were negative for signs of viral pneumonia. Notably, a second set of throat swabs and anal swabs were sent to test for SARS-CoV-2 on February 19, and the results were still confirmed positive. This is a confirmed case of asymptomatic carrier of SARS-CoV-2 infection. Her persistent positive findings in both throat and anal swabs suggested the possibility of healthy carrier of the virus, which adds to the difficulty in preventing transmission of the disease.

submitted time 2020-02-28 Hits1003Downloads271 Comment 0

2. chinaXiv:202002.00080 [pdf]

Transplantation of ACE2- mesenchymal stem cells improves the outcome of patients with COVID-19 pneumonia

Zikuan Leng; Rongjia Zhu; Wei Hou; Yingmei Feng; Hongjian Liu; Ronghua Jin; Kunlin Jin; Robert Chunhua Zhao
Subjects: Medicine, Pharmacy >> Clinical Medicine

A coronavirus (HCoV-19) has caused the novel coronavirus disease (COVID-19) outbreak in Wuhan, China, Preventing and reversing the cytokine storm may be the key to save the patients with severe COVID-19 pneumonia. Mesenchymal stem cells (MSCs) have been shown to possess a comprehensive powerful immunomodulatory function. This study aims to investigate whether MSC transplantation improve the outcome of 7 enrolled patients with COVID-19 pneumonia in Beijing YouAn Hospital, China from Jan 23, 2020. to Feb 16, 2020. The clinical outcomes, as well as changes of inflammatory and immune function levels and adverse effects of 7 enrolled patients were assessed for 14 days after MSC injection. MSCs could cure or significantly improve the functional outcomes of seven patients with COVID-19 pneumonia in 14 days without observed adverse effect. The pulmonary function and symptoms of all patients with COVID-19 pneumonia were significantly improved in 2 days after MSC transplantation. Among them, two common and one severe patient were recovered and discharged in 10 days after treatment. After treatment, the peripheral lymphocytes were increased and the overactivated cytokine-secreting immune cells CXCR3+CD4+ T cells, CXCR3+CD8+ T cells, and CXCR3+ NK cells were disappeared in 3-6 days. And a group of CD14+CD11c+CD11bmid regulatory DC cell population dramatically increased. Meanwhile, the level TNF-α is significantly decreased while IL-10 increased in MSC treatment group compared to the placebo control group. Furthermore, the gene expression profile showed MSCs were ACE2- and TMPRSS2- which indicated MSCs are free from COVID-19 infection. Thus, the intravenous transplantation of MSCs was safe and effective for treatment in patients with COVID-19 pneumonia, especially for the patients in critically severe condition.

submitted time 2020-02-28 Hits201Downloads49 Comment 0

3. chinaXiv:202002.00079 [pdf]


何豪; 何韵婷; 翟晶; 王筱金; 王炳顺
Subjects: Medicine, Pharmacy >> Preventive Medicine and Hygienics

目的 建立一种数据驱动的实用方法预测突发全新传染性疾病的疫情趋势,通过动态预判疫情风险与分级为防控策略提供量化依据。 方法 在移动平均法的基础上予以改进,提出一种移动平均预测限(Moving Average Prediction Limits, MAPL)方法,采用既往重症急性呼吸综合征(Severe Acute Respiratory Syndrome,SARS)疫情数据验证MAPL方法对疫情趋势和风险预判的实用性。追踪本次新型冠状病毒(COVID-19)感染疫情从2020年1月16日起的官方公布数据,采用MAPL方法预判疫情变动趋势与疫区适时风险分级。 结果 基于MAPL方法分析显示,2020年2月初全国COVID-19感染疫情达到峰值。经过前期积极防控,2月中旬起全国疫情整体呈下降趋势。到2月下旬各地疫情有明显的区域性差异。与湖北地区相比,非湖北地区新增病例数下降速度快且未来疫情加重的风险相对较小。在几个重要的疫情输入省份,新增确诊病例数和可疑病例数的发展趋势一致,但消减速度在各省份间存在差异。 结论 MAPL方法可以辅助判断疫情趋势并适时预判风险分级,各疫情输入区可结合当地实际与疫情风险分级规划落实差异化精准防控策略。

submitted time 2020-02-28 Hits179Downloads52 Comment 0

4. chinaXiv:202002.00085 [pdf]


张亚萌; 衡姊琦; 魏静; 王颖轶; 高友鹤
Subjects: Biology >> Biochemistry

肺癌作为一种严重威胁人类生命健康的疾病,尽管治疗方法种类较多,但如何把握治疗时机,为患者确定最有效的治疗用药仍然是一个难题。尿液蛋白质组可以敏感的反映机体的生理变化,有希望反映药物治疗后机体的病理或生理变化。为了研究晚期肺癌患者使用不同的药物进行治疗时其尿液蛋白质组的变化情况,通过收集晚期肺癌患者治疗前后的不同时间的尿液样本,使用液相色谱联用质谱(LC-MS / MS)来检测其尿蛋白组的变化。比较结果发现,当不同的患者使用不同药物治疗后,差异蛋白的变化各不相同,其差异蛋白反映的生物学过程变化和患者的临床表现变化较为一致。这项研究结果表明,(1)能够通过尿蛋白的变化反映不同药物治疗后患者的病理生理变化;(2)当不同患者使用相同药物治疗后,尿蛋白的变化能够反映出患者体内不同的病理生理变化,且和患者的临床病情评估结果较为一致。这些发现有可能为辅助临床治疗提供重要信息。

submitted time 2020-02-28 Hits2Downloads0 Comment 0

5. chinaXiv:202002.00082 [pdf]

ACE2 shedding and furin abundance in target organs may influence the efficiency of SARS-CoV-2 entry

Yuanchen Ma; Yinong Huang; Tao Wang; Andy Peng Xiang; Weijun Huang
Subjects: Medicine, Pharmacy >> Preclinical Medicine

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a recently identified lineage B coronavirus, causing rapid worldwide outbreak of Corona Virus Disease 2019 (COVID-19). Despite genetically closed to SARS-CoV, SARS-CoV-2 seems to possess enhanced infectivity and subtle different clinical features, which may hamper the early screening of suspected patients as well as the control of virus transmission. Unfortunately, there are few tools to predict the potential target organ damage and possible clinical manifestations caused by such novel coronavirus. To solve this problem, we investigate the potential host cell entry mechanisms of SARS-CoV-2 through bioinformatics. Using the online single-cell sequence datasets, we analyze the expression of major receptor in host cells that mediates the virus entry, including angiotensin converting enzyme 2 (ACE2), and its co-expressed membrane endopeptidases. The results indicated the differential expression of ADAM10 and ADAM17 might contribute to the ACE2 shedding and affect the membrane ACE2 abundance. We further confirm a putative furin-cleavage site reported recently in the spike protein of SARS-CoV-2, which may facilitate the virus-cell fusion. Based on these findings, we develop a novel approach that comprehensively analyzed the virus receptor expression, ACE2 shedding, membrane fusion activity, virus uptake and virus replication to evaluate the infectivity of SARS-CoV-2 to different human organs. Our results indicate that, in addition to airway epithelia, cardiac tissue and enteric canals are susceptible to SARS-CoV-2 as well.

submitted time 2020-02-27 Hits74Downloads30 Comment 0

6. chinaXiv:202002.00076 [pdf]


杨晓梦; 王福兴; 王燕青; 赵婷婷; 高春颍; 胡祥恩
Subjects: Psychology >> Other Disciplines of Psychology


submitted time 2020-02-27 Hits47Downloads18 Comment 0

7. chinaXiv:202002.00084 [pdf]

Clinical remission of a critically ill COVID-19 patient treated by human umbilical cord mesenchymal stem cells

Bing Liang; Junhui Chen; Tao Li; Haiying Wu; Wenjie Yang; Yanjiao Li; Jianchun Li; Congtao Yu; Fangang Nie; Zhaoxia Ma; Mingxi Yang; Panrong Nie; Yanfeng Gao; Chuanyun Qian; Min Hu
Subjects: Medicine, Pharmacy >> Clinical Medicine

Background The COVID-19 cases increased very fast in the last two months. The mortality among critically ill patients, especially the elder ones, was relatively high. Considering that most of the dead patients were caused by severe inflammation response, it is very urgent to develop effective therapeutic agents and strategies for these patients. The human umbilical cord mesenchymal stem cells (hUCMSCs) have shown very good capability to modulate immune response and repair the injured tissue with good safety. Case Presentation Here, we reported the treatment process and clinical outcome of a 65-year-old female critically ill COVID-19 patient infected with 2019-nCoV (now called SARS-CoV-2). The significant clinical outcome and well tolerance was observed by the adoptive transfer of allogenic hUCMSCs. Conclusions Our results suggested that the adoptive transfer therapy of hUCMSCs might be an ideal choice to be used or combined with other immune modulating agents to treat the critically ill COVID-19 patients.

submitted time 2020-02-27 Hits116Downloads13 Comment 0

8. chinaXiv:202002.00081 [pdf]

SARS-coronavirus-2 nsp13 possesses NTPase and RNA helicase activities

Shu, Ting; Huang, Muhan; Wu, Di; Ren, Yujie; Zhang, Xueyi; Han, Yang; Mu, Jingfang; Wang, Ruibing; Qiu, Yang; Zhang, Ding-Yu; Zhou, Xi
Subjects: Biology >> Virology

The ongoing outbreak of Coronavirus Disease 2019 (Covid-19) emerged from Wuhan, Hubei, since December 2019 has become a global public health emergency. SARS-coronavirus-2 (SARS-CoV-2), the causative pathogen of Covid-19, is a positive-sense single-stranded RNA virus belonging to the family Coronaviridae. For RNA viruses, virus-encoded RNA helicases have long been recognized to play pivotal roles during viral life cycles by facilitating the correct folding and replication of viral RNAs. Here, our studies show that SARS-CoV-2-encoded nonstructural protein 13 (nsp13) possesses the nucleoside triphosphate hydrolase (NTPase) and RNA helicase activities that can hydrolyze all types of NTPs and unwind RNA helices dependently of the presence of NTP, and further characterize the biochemical characteristics of these two enzymatic activities associated with SARS-CoV-2 nsp13. Moreover, we found that some bismuth salts could effectively inhibit both the NTPase and RNA helicase activities of SARS-CoV-2 nsp13 in a dose-dependent manner. Thus, our findings demonstrate the NTPase and helicase activities of SARS-CoV-2 nsp13, which may play an important role in SARS-CoV-2 replication and serve as a target for antivirals.

submitted time 2020-02-27 Hits82Downloads19 Comment 0

9. chinaXiv:202002.00074 [pdf]

Molecular karyotypes of loquat (Eriobotrya japonica) aneuploids can be detected by using SSR markers combined with quantitative PCR irrespective of heterozygosity

Wen, Guo; Dang, Jiangbo; Xie, Zhongyi; Wang, Jinying; Jiang, Pengfei; Guo, Qigao; Liang, Guolu
Comment:This article has been published online in Plant Methods
Subjects: Biology >> Botany
Subjects: Agriculture, Forestry,Livestock & Aquatic Products Science >> Horticulture

Background: Aneuploidy, a condition caused by an imbalance between the relative dosages of chromosomes, generally produces a novel phenotype specific to the molecular karyotype. Few techniques are currently available for detecting the molecular karyotypes of aneuploids in plants. Methods: By PCR amplification of 209 pairs of SSR primers, 17 pairs of SSR primers with no polymorphism and stable amplification in 23 different ploidy loquat were screened out. Seventeen SSR markers combined with qPCR for detection of aneuploid loquat H39 (2n=2x+5=39) karyotype variation. To verify the method for detection of aneuploid karyotype variation, 9 hybrid offspring of Q24 × ‘Huabai No. 1’ and 16 open-pollination progeny of the triploid loquat A313 and A322 were obtained, and we detected their chromosome numbers using conventional cytological methods. The SSR-qPCR method was used to detect the molecular karyotypes of aneuploids in the 9 hybrid offspring of Q24 × ‘Huabai No. 1’ and 16 open-pollination progeny of the triploid loquat A313 and A322. Results: Based on this imbalance in chromosome dosage, a new approach (referred to as ‘SSR-qPCR’) combining simple sequence repeat (SSR) markers and quantitative real-time PCR (qPCR) has been developed and utilized to detect some common aneuploids irrespective of heterozygosity. We screened 17 specific SSR markers covering all loquat linkage groups and redesigned 6 pairs of primers for SSR markers that can detect loquat chromosome aneuploidies. The SSR-qPCR detection results obtained for hybrid progeny and open-pollination progeny of triploid loquat showed diagnostic accuracies of 88.9% and 62.5%, respectively, compared with the chromosome preparation results. Limitations: Loquat genome sequences have not been published, available SSR markers are currently limited. Conclusion: SSR-qPCR can detect loquat aneuploids and be used to construct the entire molecular karyotypes of aneuploid individuals. Therefore, this method offers a novel alternative for the detection of chromosome aneuploidies.

submitted time 2020-02-27 Hits70Downloads14 Comment 0

10. chinaXiv:202002.00072 [pdf]


徐富明; 黄龙; 张慧; 相鹏; 刘腾飞; 李亚红
Subjects: Psychology >> Cognitive Psychology

借鉴行为经济学家开创的应用行为决策于贫困研究的新范式, 选取我国“连片特困地区”的贫困者为研究对象。首先建构“认知和动机双视角的行为贫困陷阱”的立论模型; 然后通过“贫困所致认知后果影响后继决策行为的心理机制和神经机制”, 以及“贫困所致认知和动机后果共同影响后继决策行为的作用机制”来探索贫困所致心理后果与后继决策行为间的因果效应; 最后进行“贫困所致认知功能改变影响后继决策行为的随机控制实验”和“贫困所致自我认同改变影响后继决策行为的现场干预研究”, 旨在通过“扶志和扶智”达到“授人以渔”, 并从中提炼出可供扶贫政策参考的管理对策。

submitted time 2020-02-26 Hits112Downloads37 Comment 0

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