Nonvesicular Release of ATP from Rat Retinal Glial (Müller) Cells is Differentially Mediated in Response to Osmotic Stress and Glutamate

Nonvesicular Release of ATP from Rat Retinal Glial (Müller) Cells is Differentially Mediated in Response to Osmotic Stress and Glutamate
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大鼠视网膜胶质细胞 (Müller) 的 ATP 非囊泡释放在对渗透压和谷氨酸的反应中存在差异介导

DOI:
10.1007/s11064-014-1511-z
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发表时间:
2015
影响因子:
4.4
通讯作者:
Bringmann A
Bringmann A
中科院分区:
医学3区
文献类型:
--
作者:
Voigt J;Grosche A;Vogler S;Pannicke T;Hollborn M;Kohen L;Wiedemann P;Reichenbach A;Bringmann A

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视网膜神经胶质(Müller)细胞在渗透压或代谢型谷氨酸受体激活时释放ATP。ATP通过激活P2 Y1受体抑制渗透性Müller细胞肿胀。在本研究中,我们确定了大鼠视网膜切片中Müller细胞释放ATP的分子途径。在低渗条件下,ATP/腺苷三磷酸双磷酸酶的给药诱导了Müller细胞的肿胀,并阻止了谷氨酸的肿胀抑制作用,这表明肿胀抑制是由细胞外ATP介导的。在存在多药耐药通道阻滞剂(MK-571)、CFTR抑制剂(格列本脲)和连接蛋白半通道阻滞剂(18-α-大黄酸,100 µM甘珀酸)的情况下,也观察到Müller细胞的低渗肿胀。谷氨酸盐的肿胀抑制作用被MK-571、连接蛋白半通道阻断剂和泛连接蛋白-1半通道阻断剂(5 µM甘珀酸)阻止。而p-糖蛋白阻断剂维拉帕米则无此作用。如单细胞RT-PCR所示,Müller细胞亚群表达泛连接蛋白-1和-2以及连接蛋白30、30.3、32、43、45和46的mRNA。这些数据可能表明,大鼠Müller细胞通过多药耐药通道、CFTR和连接蛋白半通道释放ATP,以响应渗透应激,而谷氨酸通过多药耐药通道、连接蛋白半通道和泛连接蛋白-1诱导ATP释放。
Retinal glial (Müller) cells release ATP upon osmotic stress or activation of metabotropic glutamate receptors. ATP inhibits the osmotic Müller cell swelling by activation of P2Y1receptors. In the present study, we determined the molecular pathways of the ATP release from Müller cells in slices of the rat retina. Administration of the ATP/ADPase apyrase induced a swelling of Müller cells under hypoosmotic conditions, and prevented the swelling-inhibitory effect of glutamate, suggesting that swelling inhibition is mediated by extracellular ATP. A hypoosmotic swelling of Müller cells was also observed in the presence of a blocker of multidrug resistance channels (MK-571), a CFTR inhibitor (glibenclamide), and connexin hemichannel blockers (18-α-glycyrrhetinic acid, 100 µM carbenoxolone). The swelling-inhibitory effect of glutamate was prevented by MK-571, the connexin hemichannel blockers, and a pannexin-1 hemichannel blocker (5 µM carbenoxolone). Thep-glycoprotein blocker verapamil had no effect. As revealed by single-cell RT-PCR, subpopulations of Müller cells expressed mRNAs for pannexin-1 and -2, and connexins 30, 30.3, 32, 43, 45, and 46. The data may suggest that rat Müller cells release ATP by multidrug resistance channels, CFTR, and connexin hemichannels in response to osmotic stress, while glutamate induces a release of ATP via multidrug resistance channels, connexin hemichannels, and pannexin-1.
胶质细胞衍生的谷氨酸介导视网膜自分泌细胞体积调节:VEGF 的激活
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