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Conditionally immortalized brain capillary endothelial cell lines established from a transgenic mouse harboring temperature-sensitive simian virus 40 large T-antigen gene

机译:由具有温度敏感性猿猴病毒40大T抗原基因的转基因小鼠建立的条件永生化的脑毛细血管内皮细胞系

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摘要

Five immortalized brain capillary endothelial cell lines (TM-BBB1-5) were established from 3 transgenic mice harboring temperature-sensitive simian virus 40 large T-antigen gene (Tg mouse). These cell lines expressed active large T-antigen and grew well at 33°C with a doubling time of about 20 to 30 hours. TM-BBBs also grew at 37°C but not at 39°C. However, growth was restored when the temperature of the culture was lowered to 33°C Although significant amounts of large T-antigen were shown to be present in the cell culture at 33°C, there was less of this complex at 37°C and 39°C. TM-BBBs expressed the typical endothelial marker, von Willberand factor and exhibited acetylated lowdensity lipoprotein uptake activity. The alkaline phosphatase and γ-glutamyltranspeptidase activity in TM-BBBs were −10% and 50% to 80% of brain capillary fraction of normal mice, respectively. D-Mannitol transport in the both apical-to-basal and basal-to-apical directions across the TM-BBB was 2-fold greater than for inulin. TM-BBBs were found to express GLUT-1 but not GLUT-3, and exhibited concentration-dependent 3-O-methyl-D-glucose (3-OMG) uptake activity with a Michaelis-Menten constant of 6.59±1.16 mmol/1. Moreover, P-glycoprotein (P-gp) with a molecular weight of −170 kDa was expressed in all TM-BBBs. Both mdr 1a and mdr 1b mRNA were detected in TM-BBB4 using reverse transcription-polymerase chain reaction (RT-PCR) analysis. [3H]-Cyclosporin A uptake by TM-BBB was significantly increased in the presence of 100 μmol/1 verapamil and vincristine, suggesting that TM-BBB exhibits efflux transport activity via P-gp In conclusion, conditional brain capillary endothelial cell lines were established from Tg mice. This cell line expresses endothelial markers and transporters at the BBB and is able to regulate cell growth, due to the amount of active large T-antigen in the cell, by changing the culture temperature.
机译:从3只带有温度敏感猿猴病毒40大T抗原基因的转基因小鼠(Tg小鼠)建立了5种永生化的脑毛细管内皮细胞系(TM-BBB1-5)。这些细胞系表达活跃的大T抗原,并在33°C下生长良好,约20到30小时的倍增时间。 TM-BBB在37°C时也会生长,但在39°C时不会。然而,当培养物温度降至33°C时,生长得以恢复。尽管在33°C的细胞培养物中显示了大量的大T抗原存在,但在37°C时,这种复合物较少,而39℃。 TM-BBBs表达典型的内皮标记物von Willberand因子,并表现出乙酰化的低密度脂蛋白摄取活性。 TM-BBBs中碱性磷酸酶和γ-谷氨酰转肽酶的活性分别为正常小鼠脑毛细管分数的-10%和50%至80%。沿TM-BBB的从顶至基和从基至顶的D-甘露醇转运比菊粉大2倍。发现TM-BBBs表达GLUT-1,但不表达GLUT-3,并表现出浓度依赖性的3-O-甲基-D-葡萄糖(3-OMG)摄取活性,其Michaelis-Menten常数为6.59±1.16 mmol / 1 。此外,在所有TM-BBB中均表达了分子量为-170 kDa的P-糖蛋白(P-gp)。使用逆转录-聚合酶链反应(RT-PCR)分析在TM-BBB4中检测到了mdr 1a和mdr 1b mRNA。在存在100μmol/ 1维拉帕米和长春新碱的情况下,TM-BBB对[3H]-环孢菌素A的摄取显着增加,表明TM-BBB通过P-gp表现出外排转运活性。总之,建立了条件性脑毛细管内皮细胞系来自Tg小鼠。该细胞系在BBB处表达内皮标记物和转运蛋白,并且由于细胞中活性大T抗原的量,可以通过改变培养温度来调节细胞生长。

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