制备小鼠去细胞拟胚体对Lewis肺癌细胞的促分化作用

BACKGROUND: Co-culture with embryonic stem cells or embryonic tissues can induce differentiation of carcinoma cells into normal epithelial cells or decrease malignancy of carcinoma cells. Acellular embryoid bodies retain the structure and important cytokines of embryonic tissues. OBJECTIVE:To prepare acellular embryoid bodies from mouse embryonic stem cells and to investigate their effects on differentiation of mouse Lewis lung carcinoma cells at three-dimensional culture in vitro. METHODS: Mouse embryonic stem cells (D3) were dynamically cultured for 7 days to produce embryoid bodies followed by decellularization with 0.1% sodium dodecyl sulfate. Mouse Lewis lung carcinoma cells were co-cultured with acellular embryoid bodies as test group or cultured in three-dimensional matrigel medium for 7 days as control group, respectively. Cell proliferation and expression of E-cadherin were detected by immunohistochemical staining and western blot assay, respectively. In addition, mRNA expressions of Slug and E-cadherin were observed using RT-PCR technology. RESULTS AND CONCLUSION: Uniform mouse embryoid bodies were successfully prepared, and were completely decellularized with sodium dodecyl sulfate. After 7-day three-dimensional matrigel culture, in the control group, multicellular tumor spheroids were formed, accompanied by a higher Ki67 positive rate; Lewis lung carcinoma cells in the test group were repopulated in the acellular embryoid bodies showing significantly lower Ki67 positive rate. Compared with the control group, the absorbance of Paxillin in the test group was significantly smaller, and the absorbance of E-cadherin was significantly higher (P < 0.05). Besides, mRNA expressions of Slug and E-cadherin were significantly decreased and increased in the test group compared with the control group, respectively (P < 0.05). These findings indicate that the acellular embryoid bodies can promote differentiation of mouse Lewis lung carcinoma cells in three-dimensional culture in vitro. 中国组织工程研究杂志出版内容重点：组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松; ORCID: 组织工程0000-0003-2685-4218(吕卫东)     

氯胺酮和异丙酚对小儿眼内压的影响

目的　观察静脉麻醉药氯胺酮和异丙酚对小儿眼内压的影响。方法　选择ASAⅠ～Ⅱ级患儿 2 7例 ,分为氯胺酮组和异丙酚组。肌注氯胺酮 4～ 6mg·kg-1和氟哌利多0 0 4～ 0 1mg·kg-1基础麻醉后 ,氯胺酮组单次静注氯胺酮1mg·kg-1,继之静滴 0 .0 4%氯胺酮 ,必要时间断追加氯胺酮 ;异丙酚组单次静注异丙酚 1mg·kg-1,继之静滴 0 0 4%异丙酚 ,必要时间断追加异丙酚和氯胺酮。分别于基础麻醉后 10min、单次静注氯胺酮和异丙酚 3min及手术结束后测眼内压 ,并监测收缩压 (SBP)、舒张压 (DBP)、心率 (HR)和脉搏血氧饱和度 (SpO2 )。结果　两组患儿基础麻醉后眼内压无差异 ,单次静注氯胺酮眼内压升高 ,单次静注异丙酚则眼内压下降 (P <0 0 5 ) ;手术结束后 ,氯胺酮组眼内压下降 ,与异丙酚组差异无统计学意义。基础麻醉后至手术结束 ,SBP、DBP、HR变化两组间差异无统计学意义。静注氯胺酮后 5min内 ,SpO2 其中 1例 <95 % ,余无下降 ,静注异丙酚后5min内 ,SpO2 下降与基础麻醉后比差异有统计学意义 ,其中 3例 <95 %。结论　单纯静注氯胺酮可升高眼内压 ,静注异丙酚降低眼内压 ,两者复合应用可避免眼内压升高 ,但呼吸抑制作用增强。