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1. chinaXiv:202006.00112 [pdf]

正常人尿液蛋白质组非限制修饰鉴定与比较:多位点氧化修饰是不同年龄段人群的尿蛋白修饰特点

刘永涛; 潘宣圳; 华元瑞; 王云龙; 高友鹤
Subjects: Biology >> Biochemistry

健康人尿液中的蛋白质含量虽较低,但种类却十分丰富,尿蛋白质组所蕴含信息能够展现机体生理与病理早期阶段时的细微差别。蛋白质的化学修饰是指其氨基酸残基或其链末端上参与的共价基团反应,进而使其分子的结构、执行的调控和信息传递的功能得到改变,因此,对尿液蛋白质化学修饰水平的比较与研究同样有重要意义。本研究拟以不同年龄段健康人群的尿液(儿童22例,年轻人10例,老年人6例)为研究对象,通过高分辨串联质谱及非标记定量的蛋白质组学分析方法,结合非限制性修饰鉴定算法整体比较三种类型样品之间的蛋白质化学修饰差异水平。结果表明,涉及多种氨基酸残基的氧化修饰是老年人与青少年尿液蛋白质样品之间的主要差异,且修饰影响了众多蛋白质的生物过程。本研究首次利用非限制性修饰鉴定算法研究了不同年龄段人群的尿液在整体蛋白质组修饰上的差异,并指出了氧化修饰是区分青少年和老年人尿液蛋白质的主要修饰类型。

submitted time 2020-06-15 Hits5675Downloads488 Comment 0

2. chinaXiv:202002.00085 [pdf]

晚期肺癌患者药物治疗前后尿蛋白质组的变化

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 Hits6211Downloads821 Comment 0

3. chinaXiv:202002.00018 [pdf]

2019-novel coronavirus (2019-nCoV) infections trigger an exaggerated cytokine response aggravating lung injury

Yingxia Liu; Cong Zhang; Fengming Huang; Yang Yang; Fuxiang Wang; Jing Yuan; Zheng Zhang; Yuhao Qin; Xiaoyun Li; Dandan Zhao; Shunwang Li; Shuguang Tan; Zhaoqin Wang; Jinxiu Li; Chenguang Shen; Jianming Li; Ling Peng; Weibo Wu; Mengli Cao; Li Xing
Subjects: Biology >> Biochemistry

最近,在中国武汉爆发了肺炎病例,由一种名为2019-CoV的新型冠状病毒引起。我们之前的研究中,根据中国深圳的12例2019-nCoV感染患者的临床特征,所有病例均患有肺炎,一半病例发展为急性呼吸窘迫综合征(ARDS)。本文中,我们针对这12例患者的血浆因子表达谱进行了研究。我们测试了2019-nCoV感染患者血浆中的48个因子的表达,其中38个因子与健康个体相比显着升高;2019-nCoV感染的重症患者血浆中的高细胞因子血症水平显著低于A型流感病毒H7N9感染患者,而略高于细菌感染患者。在这38个细胞因子中,有17个与2019-CoV病毒载量相关,其中的15个(M-CSF,IL-10,IFN-α2,IL-17,IL-4,IP-10,IL-7,IL-1受体拮抗剂,G-CSF,IL-12 (p40),IFN-γ,IL-1α,IL-2,HGF和PDGF-BB)与肺损伤Murray评分高度相关,可用来预测2019-nCoV感染患者的疾病严重程度。我们的研究结果表明,这15种高细胞因子可能是衡量2019-nCoV感染患者疾病严重程度的潜在生物标志物,影响这些信号传递介质的因子可能是针对新型2019-nCoV大流行的潜在药物。

submitted time 2020-02-12 Hits18664Downloads2987 Comment 0

4. chinaXiv:202002.00016 [pdf]

不同年龄段人血浆蛋白质组的整体化学修饰比较

刘永涛; 赵敏迪; 潘宣圳; 高友鹤
Subjects: Biology >> Biochemistry

蛋白质的化学修饰是指其氨基酸残基或其链末端上参与的共价基团反应,进而使其分子的结构、执行的调控和信息传递的功能得到改变。本研究采用LC-MS/MS技术结合非限制性修饰鉴定算法,比较两组不同年龄阶段人血浆蛋白质组整体的化学修饰水平之间的差异。研究发现在年长组中半胱氨酸的琥珀酰化、磷酸化修饰以及赖氨酸替换为苏氨酸的修饰显著高于年轻组,而赖氨酸的氨甲酰化修饰低于年轻组。半胱氨酸残基中的巯基是形成二硫键、维持蛋白质结构的重要基团,而以上与半胱氨酸相关的修饰涉及巯基的参与。赖氨酸为碱性氨基酸,其氨基上的修饰会改变蛋白质的酸碱性,可能导致蛋白质的结构与功能受到影响。综上所述,本研究在不同年龄段人群血浆蛋白质组中找到4种有显著差异的蛋白质分子修饰与替换类型,推测年长者血液中具有某种修饰蛋白的增多,可能反映出血中失去正常功能的蛋白质增加,这或许是年长者患有代谢性疾病、肿瘤等相关老年性疾病风险的几率高于年轻人的原因之一。

submitted time 2020-02-11 Hits7789Downloads967 Comment 2

5. chinaXiv:202002.00014 [pdf]

Clinical and Biochemical Indexes from 2019-nCoV infected patients linked to viral loads and lung injury

Yingxia Liu; Yang Yang; Cong Zhang; Fengming Huang; Fuxiang Wang; Jing Yuan; Zhaoqin Wang; Jingxiu Li; Jianming Li; Cheng Feng; Zheng Zhang; Lifei Wang; Ling Peng; Li Chen; Yuhao Qin; Dandan Zhao; Shuguang Tan; Lu Yin; Jun Xu; Congzhao Zhou
Subjects: Biology >> Biochemistry

新型冠状病毒(2019-nCoV)自2019年12月在湖北省武汉市爆发,并迅速传播到中国多地及其他国家。在本研究中,我们报告了来自中国深圳早期的2019-nCoV感染患者的流行病学、临床指标、生化指标和影像学特征,以及可用于预测疾病严重程度的潜在生物标记物。所有12例2019-nCoV感染的肺炎患者均发展为肺炎,其中一半患者进一步发展为急性呼吸窘迫综合征(acute respiratory distress syndrome,ARDS)。最常见的实验室检测生化指标异常是低白蛋白(albumine,ALB)血症、淋巴细胞(lymphocytes,LYM)计数减少,淋巴细胞百分比和中性粒细胞(neutrophils,NEU)百分比降低,C反应蛋白(C-reactive protein,CRP)和乳酸脱氢酶(lactate dehydrogenase,LDH)水平升高,以及CD8细胞计数降低。从患者呼吸道特别是下呼吸道检测到的2019-nCoV病毒滴度与肺部疾病的严重程度正相关。 ALB、LYM、LYM(%)、LDH、NEU(%)和CRP的水平与急性肺损伤程度高度相关。年龄、病毒滴度、肺损伤评分和血液生化指标:ALB、CRP、LDH、LYM(%)、LYM和NEU(%)可能是疾病严重程度的预测指标。此外, 2019-nCoV感染患者的血浆血管紧张素II水平显着升高,并且与病毒滴度和肺损伤程度线性相关。我们的研究结果提供了多种潜在的可用于诊断的生物标志物, 并提出了血管紧张素 II受体阻滞剂(angiotensin II receptor blocker,ARB)药物或可作为治疗2019-nCoV感染的潜在药物进行深入研究。

submitted time 2020-02-08 Hits7842Downloads1005 Comment 0

6. chinaXiv:201910.00014 [pdf]

盐碱胁迫下的菊芋栽培试验研究

滕美瑶; 许晓鸿
Subjects: Biology >> Biochemistry

通过引种滩涂盐碱适宜品种南菊一号的田间种植试验,观测记录生长数据,取样测量土壤理化性质,最终归纳整理,并利用SPSS17.0对整理好的数据进行统计分析。结果表明:① 南菊一号能够在吉林西部盐碱地区正常生长发育,产量丰富,适应状况良好,引种较为成功。南菊一号在淡黑钙土试验田(pH8.1)生长、存活状况显著优于以沙压碱土试验田(pH8.3)。淡黑钙土和以沙压碱土南菊一号成活率分别为94.56%、82.27%;方差分析结果差异显著(P<0.05)。② 出苗期,茎、叶干物质积累缓慢;快速生长期,茎、叶干物质积累量开始向地下转移;块茎膨大期,块茎吸收转移来的营养物质,迅速膨大至不变。淡黑钙土试验田南菊一号干物质积累量及产量显著优于以沙压碱土试验田。淡黑钙土试验田和以沙压碱土试验田在快速生长期茎的干物质积累量达到峰值,分别为912.26 g·株-1和756.02 g·株-1,方差分析结果差异显著(P<0.05)。③ 影响南菊一号在吉林省西部盐碱地区受盐碱胁迫下生长、存活的主要因素为含水量、有机质和全氮含量等。④ 南菊一号对淡黑钙土试验田改良效果显著优于对以沙压碱土的改良效果。由此可知,南菊一号能够适应并良好生长于吉林省西部盐碱地区,且南菊一号更适宜栽种于淡黑钙土试验田。

submitted time 2019-10-11 From cooperative journals:《干旱区研究》 Hits2568Downloads839 Comment 0

7. chinaXiv:201811.00111 [pdf]

Microbial adaptation to long-term N supply prevents large responses in N dynamics and N losses of a subtropical forest

Han, Xiaodge; Shen, Weijun; Zhang, Jinbo; Muller, Christoph
Subjects: Biology >> Biochemistry

Atmospherically-deposited nitrogen (N) can stimulate complex soil N metabolisms and accumulations over time. Whether long-term (decadal) N deposition effects on soil N transformations and functional microbes differ from the short-term (annual) effects have rarely been assessed. Here we conducted a laboratory 15N tracing study with soil samples from a short-term (one year) N addition site and a long-term (12 years) site in a subtropical forest. The effects of simulated N deposition on soil N2O emissions, N transformation rates and microbial nitrifying and denitrifying genes were determined. Our results showed that: (1) long-term N addition did not change soil N2O fluxes significantly in comparison to the short-term N addition. Denitrification, heterotrophic nitrification and autotrophic nitrification contributed 53%, 23% and 18% to total N2O emissions, respectively. (2) Autotrophic nitrification was the dominant N transformation process, except for the high-N treatment at the long-term site. The magnitude of soil N transformation rates was significantly different among N addition treatments but not between short- and long-term N addition sites. However, long-term N addition changed the responses of specific N transformation rates to N addition markedly, especially for the rates of nitrification, organic N mineralization to NH4+, NO3- immobilization and dissimilatory NO3- reduction to NH4+ (DNRA). (3) Responses of ammonia oxidizing archaea and bacteria (AOA and AOB) were stronger than denitrifying N2O-producers (nirK) and denitrifying N2O-reducers (nosZ) at the long-term site compared to the short-term site. (4) The close correlations among N2O flux, functional genes and soil properties observed at the short-term site was weakened at the long-term site, posing a decreased risk for N losses in the acid subtropical forest soils. There is evidence for an adaptation of functional microbial communities to the prevailing soil conditions and in response to long-term natural and anthropogenic N depositions.

submitted time 2018-11-22 Hits1698Downloads874 Comment 0

8. chinaXiv:201803.00577 [pdf]

Effects of tetracyclines on bone: an ambiguous question needs to be clarified

wenxiang cheng
Subjects: Biology >> Biochemistry

Tetracyclines have been widely used in bone histomorphometry to label new bone formation and apposition rate. However, most studies of tetracyclines have also shown their strong inhibitory action on osteoclasts and their effects on osteoblast activities as well. To even obtain the in-depth understanding on this issue, we have reviewed related studies in “Pubmed” by searching the keywords “tetracyclines and osteoclast”, “tetracyclines and osteoblast”, which retrieved 115 and 159 related documents, respectively. Among these papers, some described the application of tetracyclines as fluorescent marker in bone histomorphometry, while others discussed their role in protection of bone metabolism partly through inhibiting osteoclastogenesis or bone resorption and through enhancing osteogenesis. Based on the above mentioned, it seems that tetracyclines used as bone labeling markers may affect the results of bone histomorphometry to some extent. To even confirm the effect of tetracyclines on bone cells (osteoblast, osteoclast) and in vivo bone remodeling, related research work has been performed in our research team which indicated quite different results in vivo and in vitro. Therefore, the influence of tetracyclines on bone may differ in terms of different conditions which need to be further elucidated as well.

submitted time 2018-03-15 Hits2031Downloads846 Comment 0

9. chinaXiv:201705.00892 [pdf]

Bioactive Pentacyclic Triterpenoids from the Leaves of Cleistocalyx operculatus

Wang, Chen; Wu, Ping; Tian, Shuai; Xue, Jinghua; Xu, Liangxiong; Li, Hanxiang; Wei, Xiaoyi
Subjects: Biology >> Biochemistry

Thirteen new pentacyclic triterpenoids, cleistocalyxic acids A?K (1, 2, 4, 5, and 7?13) and cleistocalyxolides A (3) and B (6), and fifteen known analogues (14?28), based on taraxastane, oleanane, ursane, multiflorane, and lupane skeletons, were isolated from the leaves of Cleistocalyx operculatus. The structures of 1?13 were elucidated by analysis of their spectroscopic data and ECD/TDDFT computations. Cleistocalyxolide A (3), presumed to be derived from the known taraxastane-type compound 14, has a rare rearranged triterpenoid backbone. Cleistocalyxic acid B (2) displayed cytotoxicity against HepG2, NCI-N87, and MCF-7 cancer cell lines with IC50 values ranging from 3.2 to 6.5 ?M and cleistocalyxic acid D (5) was active against HepG2 and NCI-N87 cells with the values around 5.0 ?M. The non-cytotoxic cleistocalyxic acid E (7) inhibited production of IL-6 by 68.1% and TNF-? by 53.7% in LPS-induced RAW 264.7 macrophages at the concentration of 2 ?M.

submitted time 2017-05-19 Hits2412Downloads1112 Comment 0

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