Objective To observe the migration and differentiation of the neural precursor cells （NPCs） that derived from murine embryonic stem cells （ESCs） when they were transplanted into amyloid β （Aβ）-treated rat hipp...
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Objective To observe the migration and differentiation of the neural precursor cells （NPCs） that derived from murine embryonic stem cells （ESCs） when they were transplanted into amyloid β （Aβ）-treated rat hippocampus. Methods MESPU35, a murine ESC cell line that express the enhanced green fluorescent protein （EGFP）, was induced differentiation into nestin-positive NPCs by modified serum-free methods. The Aβ plaques and the differentiation of the grafted cells were observed by immunofluorescent staining. Results Comparing 16 weeks with 4 weeks post-transplantation, the migration distance increased about 5 times; the rate of migratory NPCs differentiating into glial fibrillary acidic protein （GFAP）-positive cells kept rising from （30.41 ± 1.45）% to （49.25± 1.23）%, and the rate of NPCs differentiating into neurofilament 200 （NF200） positive cells increased from （16.68±0.95）% to （27.94± 1.21）%. Meanwhile, the GFAP-positive cells targeting to the ipsilateral side of Aβ plaques increased from 60.2% to 81.3 %, while the NF200-positive cells increased from 61.3% to 84.1%. The migration distance had significant positive linear correlations to the neuronal differentiation rate （r = 0.991） and to the astrocytic differentiation rate （r = 0.953）. Conclusion Engrafted NPCs migrate targetedly to the Aβ injection site and differentiate into neurons and astrocytes.
目的：观察小鼠应激相关蛋白IFIT1（Interferon-induced protein with tetratricopetide repeats1）和JAB1（c-Jun平activation共处五项原则domain-binding protein 1）在肝脏的表达的细胞定位及氯胺酮对烧伤后早期肝脏IFIT1和JAB1表达...
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目的：观察小鼠应激相关蛋白IFIT1（Interferon-induced protein with tetratricopetide repeats1）和JAB1（c-Jun平activation共处五项原则domain-binding protein 1）在肝脏的表达的细胞定位及氯胺酮对烧伤后早期肝脏IFIT1和JAB1表达的影响，初步探讨氯胺酮调节炎症反应的分子机制。方法：将15只健康C57／129小鼠随机分为3组（n=5），正常对照组、烧伤组、烧伤＋氯胺酮组。采用TBSA 15～20％Ⅲ度小鼠烧伤模型；氯胺酮10mg／kg，肌肉注射，烧伤15min给予。分别于烧伤后4h脱臼处死，取肝。采用免疫印迹法（Western blot）察各组肝IFIT1和JAB1的表达情况。取正常对照组肝组织作病理切片，行免疫组织化学方法对IFIT1和JAB1的表达做细胞定位。结果：烧伤组IFIT1表达较正常对照组显著增高（P〈0．01）．烧伤组JAB1表达较正常对照组显著降低（P〈0．01）：氯胺酮治疗组IFIT1表达较正常对照组、烧伤对照组显著降低（P〈0．01）．氯胺酮治疗组JAB1表达较正常对照组显著降低（P〈0．05）、较烧伤组显著升高（P〈0．05）。免疫组织化学方法显示．IFIT1在肝细胞胞浆表达为阳性．JAB1在肝细胞胞浆和胞核均表达为阳性。结论：烧伤早期小鼠肝组织IFIT1表达增高而JJAB1表达降低，氯胺酮可降低烧伤早期小鼠肝组织IFIT1的高表达，增高JAB1表达；氯胺酮可通过调控严重烧伤应激中IFIT1和JAB1的表达而在全身炎性反应综合症（Systemic inflammatory response syndrome SIRS）中发挥作用。
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