大鼠失舌神经对舌味蕾Shh表达的影响

目的：探讨SD大鼠失舌神经对舌味蕾Shh表达的影响。方法：216只SD大鼠随机分为3组即正常组、单侧失神经组和双侧失神经组,每组各72只。腹腔注射麻醉后,正常组于下颌磨牙舌侧切开显露舌神经后直接缝合口底黏膜,单侧失神经组暴露并剪除右侧舌神经约0.5cm,双侧失神经组暴露并剪除双侧舌神经各0.5cm。分别于术后6h、12h、1d、2d、3d、5d、10d、15d、20d、1个月、2个月、3个月时处死动物,切取舌前2/3组织,以免疫组织化学法及原位杂交法检测味蕾Shh（sonic hedgehog）基因及蛋白的表达。结果：大鼠失舌神经支配后,舌味蕾Shh的表达逐渐降低,一侧失神经不影响健侧Shh的表达;在一定时间内,单侧失神经组可观察到术侧舌味蕾Shh表达的恢复,而双侧失神经组未见恢复。结论：SD大鼠失舌神经后,舌味蕾Shh表达明显减弱。     

An automated on-line method for simultaneous analysis of phenothiazines in human serum by high-performance liquid chromatography/sonic spray ionization mass spectrometry using backflush column switching

An automated on-line method for simultaneous analysis of five phenothiazine drugs by high-performance liquid chromatography (HPLC)/sonic spray ionization mass spectrometry (SSI-MS) has been established, using backflush column switching. A 400-μl portion of serum sample diluted 81-fold with distilled water was subjected to the on-line system. In the system, an Oasis HLB cartridge was used as the precolumn for extraction; large molecules such as proteins in serum were discarded by use of distilled water containing 0.1% formic acid as a mobile phase. After switching a valve, the analytes trapped in the precolumn were eluted in the backflush mode and separated by a Chromolith Performance RP-18e column, which is composed of C₁₈-bonded monolithic silica. The column effluents were then introduced into the SSI-MS. The present method provided successful separation and determination of six phenothiazines including an internal standard. Satisfactory linearities, reproducibility, and sensitivity were obtained at concentration levels that matched the toxic levels of phenothiazines. All drug peaks appeared within 18 min, and the system could be reequilibrated in only about 8 min for the next run. Because of the simplicity and rapidness of the method, it is likely to be useful in the fields of emergency medicine and forensic toxicology.     

恒河猴骨髓源性神经样细胞分化分子机制的基础研究

目的 探讨神经发育音猬因子(SHH)诱导恒河猴骨髓间质细胞(BMSCs)向神经样细胞分化的丝裂原活化蛋白激酶信号分子变化. 方法 密度梯度离心法分离培养恒河猴骨髓干细胞,应用Westem-blot方法检测SHH诱导细胞内信号蛋白变化,免疫组化方法观察丝裂原活化蛋白激酶(MAPK)特异性抑制剂对细胞诱导过程的影响. 结果 SHH诱导恒河猴BMSCs分化为神经样细胞分化过程,细胞内激酶p38在加入诱导液5 min后即被激活,随着时间的延长持续升高,1h达到最高峰,诱导前、后p38的总量未见变化;而磷酸化的ERKl/2被抑制,5 min时即开始减少,在2h内逐渐降低,诱导前、后ERKl/2的总量未见变化. 结论 MAPK激酶系统参与SHH诱导恒河猴MSCs分化为神经样细胞分化过程,p38被激活,而ERK被抑制.     

胃癌组织MMP-2、MMP-9、Shh蛋白的表达及与临床病理特征的关系

目的 探讨胃癌组织基质金属蛋白酶-2（MMP-2）、MMP-9及音猬因子（Shh）蛋白的表达及与临床病理特征的关系。方法 收集笔者医院54例胃癌组织与癌旁组织石蜡标本,应用免疫组化法检测MMP-2、MMP-9、Shh蛋白的表达,并分析与临床病理特征的关系。结果 胃癌组织中的MMP-2、MMP-9、Shh蛋白阳性表达比例明显高于癌旁组织（P<0.05）。MMP-2与MMP-9表达呈正相关（r=0.633）,MMP-2与Shh表达呈正相关（r=0.413）,MMP-9与Shh表达呈正相关（r=0.527）。胃癌组织MMP-2蛋白的表达与TNM分期、淋巴转移有关（P<0.05）;MMP-9蛋白的表达与TNM分期、组织类型、淋巴转移有关（P<0.05）;Shh蛋白的表达与TNM分期有关（P<0.05）。结论 MMP-2、MMP-9、Shh蛋白在胃癌组织中表达均上调,三者可能相互协同或调解对肿瘤的分化、侵袭与转移起作用。     

Sonic hedgehog signaling during nervous system development*☆

The Hedgehog signaling pathway plays a key role in embryonic development and organ formation. Sonic hedgehog signaling participates in nervous system development, regulates proliferation and differentiation of neural stem cells, controls growth and targeting of axons, and contributes to specialization of oligodendrocytes. For further studies of the Sonic hedgehog signaling pathway and for the development of new drugs in the treatment of nervous system diseases, it is beneficial to understand these mechanisms.