Adenovirus stimulates choline efflux by increasing expression of organic cation transporter-2.

Adenovirus stimulates choline efflux by increasing expression of organic cation transporter-2.
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腺病毒通过增加有机阳离子转运蛋白 2 的表达来刺激胆碱流出。

DOI:
10.1152/ajplung.00184.2004
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发表时间:
2005
期刊:
American journal of physiology. Lung cellular and molecular physiology
影响因子:
--
通讯作者:
Mallampalli,RamaK
Mallampalli,RamaK
中科院分区:
--
文献类型:
--
作者:
Miakotina,OlgaL;Agassandian,Marianna;Shi,Lei;Look,DwightC;Mallampalli,RamaK

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我们研究了野生型人腺病毒(Ad5)对小鼠肺上皮(MLE)和啮齿动物原代肺泡II型细胞胆碱转运的影响。细胞在ph敏感、可逆的胆碱运输中活跃,这一过程被苯氧苄胺(一种有机阳离子转运体(OCT)抑制剂)从药理学上阻断。检测到胆碱转运蛋白OCT-1和OCT-2的PCR产物,但只有OCT-2蛋白在MLE和原代肺泡上皮细胞中强烈表达。Ad5使细胞的胆碱外排量增加两到三倍,导致细胞内胆碱含量及其主要产物磷脂酰胆碱显著减少。苯氧苄胺可抑制Ad5对胆碱外排的影响,OCT-2小干扰RNA可减弱胆碱外排。在细胞OCT-2稳态mRNA增加的同时,腺病毒也产生免疫反应性OCT-2水平的剂量依赖性增加。这些结果表明,腺病毒可以通过上调参与有机阳离子运输的肺泡蛋白的表达,显著破坏胆碱在肺上皮中的运输。
We examined the effect of wild-type human adenovirus (Ad5) on choline transport in murine lung epithelia (MLE) and in rodent primary alveolar type II cells. Cells were active in pH-sensitive, reversible transport of choline, a process blocked pharmacologically with phenoxybenzamine, an inhibitor of organic cation transporters (OCT). PCR products for the choline transporters, OCT-1 and OCT-2, were detected, but only OCT-2 protein was robustly expressed within MLE and primary alveolar epithelial cells. Ad5 produced a two- to threefold increase in choline efflux from cells, resulting in a significant reduction in intracellular choline content and its major product, phosphatidylcholine. Effects of Ad5 on choline efflux were inhibited with phenoxybenzamine, and choline efflux was attenuated by OCT-2 small interfering RNA. Adenovirus also produced a dose-dependent increase in immunoreactive OCT-2 levels concomitant with increased cellular OCT-2 steady-state mRNA. These results indicate that adenoviruses can significantly disrupt choline trafficking in lung epithelia by upregulating expression of an alveolar protein involved in organic cation transport.
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