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Diabetologia:通过脑内皮细胞揭开胰岛素转运的调控

2017-07-31 MedSci MedSci原创

循环胰岛素要作用于脑部,必须穿过血脑屏障(BBB)。对于循环胰岛素如何跨越BBB的高度限制性脑内皮细胞(BEC),知之甚少。因此,研究人员研究了BEC转胞吞期间BEC胰岛素摄取的调节,信号转导和BEC细胞凋亡降解的潜在机制,以及高脂饮食(HFD)和星形胶质细胞活动如何影响转运。

循环胰岛素要作用于脑部,必须穿过血脑屏障(BBB)。对于循环胰岛素如何跨越BBB的高度限制性脑内皮细胞(BEC),知之甚少。因此,研究人员研究了BEC转胞吞期间BEC胰岛素摄取的调节,信号转导和BEC细胞凋亡降解的潜在机制,以及高脂饮食(HFD)和星形胶质细胞活动如何影响转运。近日,国际杂志 《Diabetologia》上在线发表一项关于通过脑内皮细胞揭开胰岛素转运的调控的研究。

使用单次培养和星形胶质细胞共培养的纯化分离的BECiBEC)测试125I -TyrA14-胰岛素摄取和转胞吞作用以及胰岛素受体(IR)封闭,胰岛素信号传导抑制,星形胶质细胞刺激和HFD的效果。

在生理胰岛素浓度下,IR而不是IGF-1受体促进BEC胰岛素摄取,这需要脂质筏介导的内吞作用,但不需要胰岛素作用于磷酸肌醇-3-激酶(PI3K)或丝裂原活化蛋白激酶激酶(MEK)。喂养HFD大鼠4周可降低iBEC胰岛素摄取并增加NF-κB结合活性,而不影响胰岛素PI3K信号,IR表达或含量或胰岛素降解酶表达。使用体外BBBiBECs和星形胶质细胞的共培养物),研究人员发现胰岛素转胞吞过程中未降解,且刺激星形细胞与L-谷氨酸增加转胞吞作用,同时抑制一氧化氮合成酶降低的胰岛素转胞吞作用。

胰岛素通过IR特异性,囊泡介导的BECs转运过程完整地穿过BBBHFD喂养,一氧化氮抑制和星形胶质细胞刺激可以调节BEC胰岛素摄取和转胞吞作用。

原始出处:

Sarah M. Gray, Kevin W. Aylor, Eugene J. Barrett. Unravelling the regulation of insulin transport across the brain endothelial cell

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    2017-10-30 baoya
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    2017-09-05 yzh409
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    2017-08-01 189****7206

    学习了谢谢分享

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    2017-08-01 lyh994

    胰岛素通过IR特异性,囊泡介导的BECs转运过程完整地穿过BBB。HFD喂养,一氧化氮抑制和星形胶质细胞刺激可以调节BEC胰岛素摄取和转胞吞作用。

    0

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    2017-08-01 飛歌

    学习了很有用不错

    0

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