Wnt-1在大鼠脑缺血再灌注海马组织内源性神经干细胞早期增殖分化中的作用

目的:检测wnt-1在大鼠脑缺血再灌注海马组织神经干细胞早期增殖分化中的表达及其变化,探讨影响神经干细胞早期增殖分化的分子调控机制。方法:实验于2005-08/2006-08在沈阳医学院完成。选择健康雄性Wistar大鼠30只,随机分为正常组,缺血再灌注3,7,14,21d组,每组6只。缺血再灌注各组采用颈动脉负压分流法制作大鼠脑缺血再灌注模型。正常组不作任何手术处理。用免疫组织化学SP法及显微图像分析检测海马神经干细胞中BrdU,Wnt-1的表达。结果:30只大鼠均进入结果分析。①缺血再灌注各组大鼠海马均可见BrdU阳性细胞。阳性细胞呈棕黄色,形态多样,呈圆形、椭圆形或梭形。脑缺血再灌注第3天缺血海马神经元BrdU阳性细胞明显增多,BrdU阳性细胞百分率为(56.78±2.37)%,第7天达高峰,BrdU阳性细胞百分率为(69.99±6.01)%,第14,21天逐渐减少,分别为(49.35±5.57)%,(38.33±7.89)%。缺血再灌注各组与正常组[(4.89±5.60)%]比较,差异有显著性意义(P<0.05)。②缺血再灌注各组大鼠均有wnt-1表达,海马颗粒层细胞质呈棕黄色颗粒,不着色为阴性。脑缺血再灌注第3天Wnt-1反应产物有所增多,海马组织Wnt-1表达的平均灰度值为103.67±5.49。第7天表达最强,平均灰度值为75.34±6.75,以后表达逐渐减少。缺血再灌注各组与正常组(132.47±2.96)比较,差异有显著性意义(P<0.05)。结论:Wnt-1时间依赖性表达与神经干细胞增殖分化进程相吻合,说明其在神经干细胞早期增殖分化中起重要调控作用。     

面神经损伤后面神经核中黏附分子CD44表达与穴位电针刺激的影响

目的:观察穴位电针在面神经损伤后面神经再生中的作用及对黏附分子CD44表达的影响。方法:实验于2005-09/2006-02在泸州医学院神经生物学实验室完成。①实验材料:普通级6～8个月龄新西兰家兔36只,体质量2～2.75kg,雌雄不拘。②实验方法:采用随机数字法取兔32只,压榨损伤右侧面神经上颊支制备面神经损伤模型。③实验分组:随机分为手术对照组16只,不作穴位电针刺激,自然恢复;针刺组16只术后立即行翳风、颧髎、颊车、地仓、阳白、四白及合谷穴位电针治疗,1次/d,30min/次;另取4只家兔做正常对照组。④实验评估:于术后1,4,7,14d每组分别取4只兔麻醉后,经心灌注处死动物,苏木精-伊红染色观察面神经核的改变,免疫组织化学观察CD44的表达。结果:36只兔全部进入结果分析。①手术对照组和针刺组兔面神经核运动神经元的形态学改变:术后1d,两组细胞形态正常;术后4d,两组细胞肿胀、胞浆空泡化、染色质溶解、核仁偏移、尼氏小体消失;术后7d,手术对照组有明显神经元的死亡,针刺组仅有神经元变性表现,并出现核仁回归、尼氏小体重现;术后14d,手术对照组神经元的坏死更为明显,针刺组神经元肿胀及变性程度有明显改善。②各组CD44标记阳性面神经核运动神经元数目:正常组,面神经核中有CD44表达。术后1d,针刺组和手术对照组CD44有明显增加;术后4d,针刺组CD44阳性细胞数较手术对照组显著性增加(P<0.01);术后7d,手术对照组的CD44阳性细胞数目较针刺组增加(P<0.05)。术后14d,两组比较无差别,阳性细胞免疫染色着色不一。结论:穴位电刺激能促进黏附分子CD44在损伤面神经核的表达。     

Effects of primary glaucoma on sleep quality and daytime sleepiness of patients residing at an equatorial latitude

AIM: To investigate the efficacy and the safety of umbilical cord derived mesenchymal stem cell (UC-MSC) implantation in patients with retinitis pigmentosa (RP). METHODS: This prospective, single-center, phase 3 clinical study enrolled 124 eyes of 82 RP patients. The patients received 5 million UC-MSCs to the suprachoroidal area with a surgical procedure. Patients were evaluated on the 1st day, 1st and 6th month postoperatively. Best corrected visual acuity (BCVA), anterior segment and fundus examinations, color photography, optical coherence tomography (OCT), and visual ?eld (VF) tests were carried out at each visit. Fundus ?uorescein angiography (FFA) and multifocal electroretinography (mfERG) recordings were performed at the end of the 6th month. Ocular and systemic adverse events of the surgical procedure were also noted. RESULTS: All of the 82 patients completed the 6-month follow-up period. None of them had any serious systemic or ocular complications. There were statistically significant improvements in BCVA and VF during the study (all P<0.05). The amplitudes of the P1 waves in the central areas showed significant improvements in mfERG recordings. There were also significant increases in implicit times of P1 waves in the central areas. CONCLUSION: Suprachoroidal administration of UC-MSCs has beneficial effect on BCVA, VF, and mfERG measurements during the 6-month follow-up period. Cell mediated therapy based on the secretion of growth factors (GFs) seems to be an effective and safe option for degenerative retinal diseases.