Lingo-1介导Rho-ROCK通路调控神经干细胞的分化

背景:Lingo-1在神经元轴突再生、髓鞘形成等过程中具有重要作用,但其是否参与对神经干细胞分化的调控以及具体机制尚无定论。目的:观察干预神经干细胞Lingo-1表达水平对其分化方向的影响,并探索其可能机制。方法:从新生大鼠脑组织分离培养神经干细胞,经神经干细胞标志物检测鉴定后分别使用Lingo-1 shRNA慢病毒载体及阴性对照病毒转染神经干细胞,再用成神经元诱导分化培养基培养7 d,随后运用免疫荧光、免疫RhoA印迹技术检测神经元相关标志物表达,并检测、ROCK1蛋白表达水平。结果与结论:(1)从新生大鼠脑组织所分离培养的神经干细胞呈浮球状生长,高表达神经干细胞特异性标志物Nestin、Sox2与Pax6,符合神经干细胞特征;(2)慢病毒载体转染可在mRNA及蛋白质水平实现对神经干细胞Lingo-1的干扰,经诱导培养7 d后Lingo-1敲低的神经干细胞分化为神经元的比例显著增加,且伴随着RhoA、ROCK1蛋白表达水平的下降;(3)结果表明,Lingo-1参与对神经干细胞分化方向的调控,抑制Lingo-1可促进其向神经元方向分化,该过程可能与调控Rho-ROCK通路有关。

Effect of aging on cytoskeleton system of Kupffer cell and its phagocytic capacity

IM To investigate the agerelated alterations of cytoskeleton system in liver Kupffer cell and their relation to the changed phagocytic function.METHODS The phagocytic function of Kupffer cells from rats of various ages (6mo, 12mo, 18mo and 24mo) were quantitatively evaluated by phagocytosis of polystyrene beads. The actin distribution and measurement of Kupffer cell were determined by a phalloidinTRITC method; and the myosin and vimentin distribution and measurement with indirect immunochemical staining.RESULTS Aging resulted in significant alterations of actin, myosin and vimentin distributions and reductions in Kupffer cell; the 3 cytoskeleton components of 24moold Kupffer cell were significantly decreased to 680%, 849% and 755%, respectively of these of 6moold Kupffer cell(P<001,001 and 001). And these decreases had significant positive relations with the damaged phagocytosis of the aged Kupffer cell. γ values were 096(P<005), 099(P<001) and 095 (P<005) respectively.CONCLUSION The cytoskeleton system of the aged Kupffer cell presents an evident state of senescence, which may be an important mechanism of decreased phagocytosis of the aged Kupffer cell..

肺毛霉菌病8例临床特征及诊治分析

目的探讨肺毛霉菌病的临床特点、治疗方法及预后,提高临床对该病的认识,减少误诊漏诊。方法回顾性分析广西医科大学第一附属医院2004年1月~2018年6月诊治的8例肺毛霉菌病患者的临床资料,分析其临床特点。结果8例患者中,男4例,女4例;年龄42.5~69.5岁,中位年龄59岁。其中基础疾病6例(2型糖尿病3例,慢性阻塞性肺疾病1例,系统性红斑狼疮、狼疮性肾炎应用免疫抑制剂1例,重度贫血1例),无基础疾病2例。1例无症状者为体检肺部阴影行支气管镜肺活检确诊,7例主要临床表现为咳嗽、咳痰、咯血、气促、消瘦等,发热3例;实验室检查:7例白细胞升高,4例C反应蛋白升高,6例血沉升高,3例血糖控制不佳,1例肝功能异常;肺部CT主要表现为大片实变、斑片渗出影、巨大空洞伴不完全坏死、结节等,支气管镜下检查可见病变部位支气管腔内肿物样改变。8例患者均通过肺组织病理学或痰培养找到病原学确诊,5例在入院前感染,3例在入院后感染,其中2例入住ICU感染。药物治疗以两性霉素B脂质体治疗3例,三唑类抗真菌药物氟康唑或伊曲康唑3例,手术治疗1例,未抗真菌1例。治愈3例,死亡5例(62.5%)。结论肺毛霉菌病好发于有基础疾病者,可社区或院内感染;除呼吸道症状外,肺部CT表现为大片实变、斑片状渗出影、巨大空洞伴不完全坏死、结节等;病死率高,建议尽早使用两性霉素B或单纯手术治疗。