BDNF is involved in sympathetic sprouting in the dorsal root ganglia following peripheral nerve injury in rats

Peripheral nerve injury results in sympathetic sprouting around large diameter sensory neurons in the dorsal root ganglia (DRG). The mechanism underlying this pathological phenomenon is not known. Brain-derived neurotrophic factor (BDNF) is up-regulated in large sensory neurons and ensheathing satellite cells following a sciatic nerve injury. In the present study, we investigated the effects of BDNF on the sympathetic sprouting in the DRG, by delivering BDNF antibody or antisense oligodeoxynucleotide to injured DRGs, or by delivering exogenous BDNF to intact DRGs. The sheep antibody to BDNF, characterized by bioassays and dot blots, specifically reacted with BDNF but not other neurotrophins. Noradrenergic fibers were visualized by immunostaining of tyrosine hydroxylase (TH) and quantified by an NIH Imaging program. Two weeks following L5 spinal nerve lesion, a dramatic increase in TH-immunoreactive (-ir) fibres was observed in both ipsi- and contralateral DRGs in normal sheep IgG treated rats. BDNF antibody significantly reduced the sprouting of sympathetic nerves in both ipsi- and contra-lateral DRGs by 67% and 42% respectively. BDNF antisense oligodeoxynucleotide, by inhibiting BDNF synthesis in DRGs, also significantly suppressed the sprouting by 67% and 60% respectively in the ipsi- and contra-lateral DRGs. Delivery of exogenous BDNF into an intact L5 DRGs resulted in an increase in the sprouting by 4.2-fold. Our results clearly indicate that BDNF, synthesized in and secreted from the DRGs, is involved in the sympathetic sprouting in the DRG following the peripheral nerve injury.     

金莲花软胶囊中总黄酮的含量测定

目的建立紫外法测定金莲花软胶囊中总黄酮的含量测定方法。方法采用紫外分光光度计,检测波长500nm,以芦丁为标准品测定本品总黄酮含量。结果测得线性回归方程为y=0.11359x-0.0034,r=0.9999(n=5),平均回收率为99.67%,RSD为0.58%(n=9)。结论本方法简便,准确、重复性好。     

At the heart of the problem: congestive cardiac failure as a cause of ascites: A narrative review

Heart failure leading to cardiac ascites is an extremely rare and underrecognized entity in clinical practice. Recognizing cardiac ascites can be difficult, especially since patients presenting with ascites may have more than 1 etiology. Various biomarkers are available to aid in the diagnosis of cardiac ascites, though with differing sensitivities and specificities. Such biomarkers include serum albumin, ascitic albumin and protein, as well as serum N-terminal pro-brain natriuretic peptide (NT-proBNP). While serum NT-proBNP is a powerful biomarker in distinguishing the etiology of ascites and monitoring treatment progression, its cost can be prohibitive in low-resource settings. Clinicians practicing under these circumstances may opt to rely on other parameters to manage their patients. We go on further to report a series of 3 patients with cardiac ascites to illustrate how these biomarkers may be employed in the management of this patient population. Clinicians should always keep in mind the differential diagnosis of cardiac failure as a cause of ascites. The resolution of cardiac ascites may serve as a surrogate clinical marker for response to antifailure therapy in lieu of NT-proBNP at resource-scarce centers.     

复杂坠落伤28例诊断与治疗体会

坠落伤多为复合伤,患者入院时多有不同程度的休克和昏迷,伤情复杂,患者病史叙述不清,查体难以合作,诊治不当易造成死亡。我院2002年1月~2004年12月收治坠落伤28例,重度多发伤比例高,我们严格按照Crashplan或VIPCO程序进行,遵循边抢救边诊断的原则,治愈20例、好转6例,取得满意疗     

慢性肺源性心脏病急性加重期98例糖代谢异常分析

目的:探讨慢性肺源性心脏病(肺心病)急性加重期糖代谢异常变化及其原因。方法:选择无糖尿病病史的肺心病急性加重期患者98例进行糖耐量试验(OGTT),并同健康对照组相比较。结果:肺心病患者血糖峰值为(8.46±0.61)mmol/L,显著高于对照组(7.59±0.50)mmol/L(P<0.01);平均高峰时间为(0.60±0.18)小时,而对照组为(0.75±0.24)小时,2组差异有显著性意义(P<0.05)。结论:肺心病患者糖代谢异常,可能与胰岛素分泌不足和胰岛素灭活障碍有关。     

A First-Principles Study on the Hydration Behavior of (MgO)n Clusters and the Effect Mechanism of Anti-Hydration Agents

Magnesia-based refractory is widely used in high-temperature industries; its easy hydration is, however, a key concern in refractory processing. Understanding the hydration mechanism of MgO will help in solving its hydration problem. Herein, the hydration behavior of (MgO)_n (n = 1–6) at the molecular level and the effect mechanisms of several anti-hydration agents on the hydration of (MgO)₄ were investigated with first-principles calculations. The results indicated that the following: (1) The smaller the (MgO)_n cluster size, the more favorable the hydration of MgO and the tendency to convert into Mg(OH)₂ crystal; (2) Anti-hydration agents can coordinate with the unsaturated Mg atom of (MgO)₄ to form a bond, increasing the coordination number of Mg, thus reducing its activity when reacting with H₂O; (3) The greater the number of −COOH groups and the longer the chain length in the anti-hydration agents, the better its effect of inhibiting the hydration of MgO. These findings could enhance the understanding of the mechanism of hydration of MgO and provide theoretical guidance for the design of novel anti-hydration agents.     

Vitamin D Status Presents Different Relationships with Severity in Metabolic-Associated Fatty Liver Disease Patients with or without Hepatitis B Infection

Whether the associations between serum vitamin D (VitD) and metabolic-associated fatty liver disease (MAFLD) vary with chronic hepatitis B (CHB) infection has not been well established. This study aims to investigate the relationships between serum VitD and metabolism, liver fat content (LFC) and fibrosis among MAFLD patients with and without CHB. Consecutive subjects (healthy controls: 360, CHB: 684, MAFLD: 521, CHB with MAFLD: 206) were prospectively enrolled between January 2015 and December 2021. Anthropometric, laboratory, imaging, and histological evaluations were conducted, with LFC measured via magnetic resonance imaging-based proton density fat fraction (MRI-PDFF). Serum VitD levels were lower in MAFLD patients than in healthy controls and patients with CHB alone or overlapping with MAFLD (24.4 ± 8.1 vs. 29.0 ± 9.5 vs. 27.4 ± 9.6 vs. 26.8 ± 8.4 ng/mL respectively; p < 0.001 in one-way ANOVA test). After adjusting for confounding factors, including season, hypersensitive C-reactive protein, insulin resistance, liver stiffness measurements, sun exposure, exercise and dietary intake, multivariate linear regression analysis revealed that VitD remained significantly negatively correlated with LFC in MAFLD patients (β = −0.38, p < 0.001), but not in CHB with MAFLD patients. Moreover, quantile regression models also demonstrated that lower VitD tertiles were inversely associated with the risk of insulin resistance and moderate–severe steatosis in the MAFLD group (p for trend <0.05) but not in the MAFLD with CHB group. VitD deficiency was associated with the severity of metabolic abnormalities and steatosis independent of lifestyle factors in MAFLD-alone subjects but not in MAFLD with CHB subjects.     

内侧开放楔形胫骨高位截骨术治疗膝关节内侧单间室骨关节炎后的足底压力分析

目的 分析内侧单间室膝关节骨性关节炎(knee osteoarthritis, KOA)患者接受内侧开放楔形胫骨高位截骨术(medial opening wedge high tibial osteotomy, MOWHTO)治疗后的足底压力分布情况,为患者的手术治疗和康复提供生物力学参考。方法 选取31例行单侧MOWHTO治疗后的内侧单间室KOA患者作为实验组,同时以35例同年龄健康人群作为对照组,使用Pedomedic 40^?足底压力测试系统进行动态足底压力的测试。通过比较步行状态下实验组(术侧及未术侧)与对照组不同足底分区的峰值压强(p_max)、压力时间积分(force-time integral, FTI)和接触面积(contact area, CA),评估内侧单间室KOA患者MOWHTO术后的足底压力变化。结果 与未术侧和对照组相比,术侧第1跖骨区(MH1)CA和FTI偏高(P<0.05),第4跖骨区(MH4)CA偏小(P<0.001),第5跖骨区(MH5)p_max和FTI偏小(P<0.05)...     

男男性行为者艾滋病暴露前预防用药性行为去抑制化情况

目的：了解男男性行为者（men who have sex with men,MSM）在参加暴露前预防用药（pre-exposure prophylaxis,PrEP）临床试验中是否存在性行为去抑制化现象及其影响因素。方法：采用非概率抽样法招募并筛选出108名MSM,随机分为77名服用药物组和31名空白对照组,第12、24、36、48周进行临床随访和问卷调查,问卷调查主要包括社会人口学特征,艾滋病相关知识、态度和行为等相关情况。采用单因素和多因素的广义估计方程分析MSM在参与PrEP中是否存在性行为去抑制化现象及其影响因素。结果：药物服用组MSM在参与PrEP的第12、24、36、48周的性伴个数中位数分别为1（0,6）、1（0,6）、1（0,10）、1（0,3）、1（0,3）,高危性行为次数中位数分别为1（0,26）、1.5（0,8）、1（0,12）、1（0,9）、2（0,30）;空白对照组性伴个数中位数分别为1（0,21）、1（0,2）、1（0,3）、1（0,3）、1（0,3）,高危性行为次数中位数分别为1（0,9）、1（0,6）、0.5（0,15）、0（0,10）、1（0,10）;多因素广义估计方程分析发现MSM在参与PrEP过程中性伴个数及高危性行为次数均没有发生改变（Z=-0.24,P=0.811;Z=0.93,P=0.355）,性行为方式为“1”和“0.5”的较性行为方式为“0”的拥有更多的性伴（Z=2.47,P=0.014;Z=2.24,P=0.025）;发生过商业性行为的MSM较没有发生过的拥有较少的性伴和高危性行为（Z=-2.82,P=0.005;Z=-2.28,P=0.023）;已婚较离异MSM发生较少的高危性行为次数（Z=-2.34,P=0.019）。结论：本研究中暂未发现PrEP中存在性行为去抑制化现象,性行为方式为“1”和“0.5”的MSM拥有较多性伴,是后期随访中的重点管理人群。还需进一步加强对艾滋病相关知识的科普。     

重庆喀斯特地区金银花的生物学特性及规范化种植技术研究

为促进金银花种植技术在广大喀斯特地区顺利推广,促进中药材产业的顺利发展,并促进喀斯特地区生态顺利恢复,结合喀斯特地区生态恢复技术研究项目的 开展,开展了金银花主要品种忍冬在喀斯特地区的生物学特性研究、生态作用分析和规范化种植技术研究,形成了较为系统金银花规范化种植技术体系,主要包括育苗、移栽、田间管理、病虫害防治及加工...