Brn3b基因对视神经损伤条件下视网膜神经节细胞的保护作用

目的　探讨Brn3b过表达对视神经损伤条件下视网膜神经节细胞（retinal ganglion cells，RGCs）的保护作用。方法　选取雄性健康成年BALB/c小鼠60只，用微型视神经夹将小鼠右眼球后视神经夹持损伤，按视神经损伤后的天数依次分为第1、3、5、7、14天组，小鼠左侧正常眼作为空白组，明确视神经损伤天数条件。选取雄性健康成年BALB/c小鼠40只，用微量进样器以小鼠右眼玻璃体内注射的方法将腺相关病毒载体转染小鼠视网膜，建立Brn3b过表达模型并分组:Brn3b过表达组［转染Brn3b过表达腺相关病毒载体（Brn3b overexpressed adeno-associated viral vector，AAV-CMV-Brn3b）］和阴性对照组［转染空白腺相关病毒载体（blank adeno-associated viral vector，AAV-CMV-GFP）阴性对照物］，每组20只；之后，取Brn3b过表达组和阴性对照组各10只，用微型视神经夹将小鼠右眼球后视神经夹持损伤，构建模拟小鼠视神经损伤（controlled optic nerve crush，CONC）模型并分组:CONC-Brn3b过表达组和CONC-阴性对照组。利用视网膜铺片和切片免疫荧光标记相关蛋白表达量，检测Brn3b过表达对视神经损伤条件下RGCs、Brn3b和Caspase3蛋白表达的影响，并对其共定位情况做出统计分析。结果　与阴性对照组相比，Brn3b过表达组小鼠视网膜Brn3b的表达水平明显增加。在小鼠CONC模型制作后的第7天RGCs的总凋亡数量达到65%，第14天RGCs的凋亡数量未见进一步改变。免疫荧光标记的蛋白表达量及其共定位分析显示，在视神经损伤条件下，与CONC-阴性对照组相比，CONC-Brn3b过表达组小鼠RGCs的凋亡量以及凋亡因子Caspase3的表达量均明显减少，差异均有统计学意义（均为P＜0.001）。结论　Brn3b基因对视神经损伤条件下RGC具有明确的保护作用，Brn3b基因对凋亡因子Caspase3的表达可能具有一定的抑制作用。     

早产儿视网膜病变研究新进展

早产儿视网膜病变是一种病理性新生血管增殖并伴纤维化改变的早产儿眼底疾病,是当前发展中国家和发达国家儿童可预防性失明的重要原因,其研究进展一直是眼科和儿科的临床关注热点。随着对早产儿视网膜病变发病机制更清晰的认知,其基础和临床研究日益增多,其抗血管内皮生长因子治疗及手术治疗方式较为成熟,同时多种治疗药物如胰岛素样生长因子-1、转化生长因子-β、多不饱和脂肪酸、β-肾上腺素受体阻滞剂等也取得一定进展,现就早产儿视网膜病变相关研究进展做一综述。     

关于检验质量理论几个基本概念的思考和建议

检验结果的准确度（性）与可靠性是同一概念的两种说法，“精密度”是准确度的基础部分，而不应当说可靠包括了准确和精密两个方面。“精密度”概念在检验医学上的内涵与其在《汉语词典》中的词义有很大出入，且precision与accuracy这两个英文单词也有词义交叉。科学与文化从来就不割裂，故而作者建议在这个概念上停止使用“精密度”这一名词，改用稳定性（度）和（或）重复性之名。定义“正确度”这一概念来表示均值与真值的接近程度不合适，何况“偏倚”这个概念已能说明相关问题。严谨的表述应当为，室内质量控制反映检验结果的稳定性，室间质量评价则评估检验结果的准确性。由此建议，将室问质量评价又称作准确性验证．室内质量控制也可另称作稳定性监控。     

古溪针刀辅助鲑降钙素治疗老年骨质疏松症的临床疗效分析

目的分析古溪针刀辅助鲑降钙素治疗老年骨质疏松症的临床疗效。方法将我院收治的66例老年骨质疏松症患者随机分为观察组33例,对照33例。观察组患者行古溪针刀辅助鲑降钙素联合钙剂治疗,对照组患者行鲑降钙素联合钙剂治疗。两组患者及治疗6个月、12个月后均测量骨密度、评价疼痛控制情况、生活能力改善情况等。结果对照组疼痛、日常生活能力、腰椎及左髋关节骨密度均在治疗后6、12个月有所改善,但与观察组对比发现,观察组治疗后6个月疼痛得到明显缓解(P0.05),日常生活能力、腰椎及左髋关节骨密度得到明显提高(P0.05),且在治疗12个月后日常生活能力、腰椎及左髋关节骨密度仍在不断改善(P0.05)。结论古溪针刀辅助鲑降钙素治疗的临床疗效显著,能快速缓解老年骨质疏松症患者疼痛,并有效提高其骨密度和日常生活能力,控制骨量的的减少,避免发生病理性骨折。     

GSK-3β suppresses the proliferation of rat hepatic oval cells through modulating Wnt/β-catenin signaling pathway

Aim:

Glycogen synthase kinase 3β (GSK-3β) plays a crucial role in hepatic biology, including liver development, regeneration, proliferation and carcinogenesis. In this study we investigated the role of GSK-3β in regulation of growth of hepatic oval cells in vitro and in liver regeneration in partially hepatectomized rats.

Methods:

WB-F344 cells, the rat hepatic stem-like epithelial cells, were used as representative of oval cells. Cell viability was examined using a WST-8 assay. The cells were transfected with a recombinant lentivirus expressing siRNA against GSK-3β (GSK-3βRNAiLV) or a lentivirus that overexpressed GSK-3β (GC-GSK-3βLV). Adult rats underwent partial (70%) hepatectomy, and liver weight and femur length were measured at d 7 after the surgery. The expression of GSK-3β, phospho-Ser⁹-GSK-3β, β-catenin and cyclin D1 was examined with immunoblotting assays or immunohistochemistry.

Results:

Treatment of WB-F344 cells with the GSK-3β inhibitor SB216763 (5 and 10 μmol/L) dose-dependently increased the levels of phospho-Ser⁹-GSK-3β, but not the levels of total GSK-3β, and promoted the cell proliferation. Knockout of GSK-3β with GSK-3βRNAiLV increased the cell proliferation, whereas overexpression of GSK-3β with GC-GSK-3βLV decreased the proliferation. Both SB216763 and GSK-3βRNAiLV significantly increased the levels of β-catenin and cyclin D1 in the cells, whereas GSK-3β overexpression decreased their levels. In rats with a partial hepatectomy, administration of SB216763 (2 mg/kg, ip) significantly increased the number of oval cells, the levels of phospho-Ser⁹-GSK-3β, β-catenin and cyclin D1 in liver, as well as the ratio of liver weight to femur length at d 7 after the surgery.

Conclusion:

GSK-3β suppresses the proliferation of hepatic oval cells by modulating the Wnt/β-catenin signaling pathway.     

Monotropein exerts protective effects against IL-1β-induced apoptosis and catabolic responses on osteoarthritis chondrocytes

Osteoarthritis, characterized by a loss of articular cartilage accompanied with inflammation, is the most common age-associated degenerative disease. Monotropein, an iridoids glycoside isolated from the roots of Morinda officinalis How, has been demonstrated to exhibit anti-inflammatory activity. In the present study, monotropein was firstly to exhibit cartilage protective activity by down regulating the pro-inflammatory cytokines in the knee synovial fluid in vivo. The anti-apoptotic and anti-catabolic effects of monotropein on rat OA chondrocytes treated by IL-1β were investigated in vitro. In cultured chondrocytes, monotropein attenuated apoptosis in a dose-dependent manner in response to IL-1β stimulation. Moreover, treatment with monotropein, the expressions of MMP-3 and MMP-13 were significantly decreased, the expression of COL2A1 was increased. Taken together, these findings suggested that monotropein exerted anti-apoptosis and anti-catabolic activity in chondrocytes, which might support its possible therapeutic role in OA.     

Sevoflurane represses the progression of glioma by the regulation of circ_0037655/miR-130a-5p/RPN2 axis

Metabolic Brain Disease - Sevoflurane (SEV) is a common anesthetic to inhibit glioma progression. The previous studies have indicated the molecular mechanisms of SEV function in glioma. The...