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Gap Junctions Mediate Glucose Transport Between GLUTl- Positive and -Negative Cells in the Spiral Limbus of the Rat Cochlea

机译:间隙连接介导大鼠耳蜗螺旋Li中GLUT1阳性和阴性细胞之间的葡萄糖转运。

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摘要

To elucidate the role of the spiral limbus in glucose transport in the cochlea, we analyzed the expression and localization of GLUT1, connexin26, connexin30, and occludin in the spiral limbus of the rat cochlea. GLUT1 and occludin were detected in blood vessels. GLUT1, connexin26, connexin30, and occludin were also expressed in fibrocytes just basal to the supralimbal lining cells. Connexin26 and connexin30 were present among not only these GLUT 1-positive fibrocytes but also GLUT 1-negative fibrocytes. In vivo glucose imaging using 6-[N-(7-nitrobenz-2-oxa-l,3-diazol-4-yl)arnino]-6-deoxyglucose (6-NBDG, MW 342) together with Evans Blue Albumin (EBA, MW 68,000) showed that 6-NBDG was rapidly distributed throughout the spiral limbus, whereas EBA was localized only in the vessels. Moreover, the gap junctional uncoupler heptanol inhibited the distribution of 6-NBDG. These findings suggest that gap junctions play an important role in glucose transport in the spiral limbus, i.e., that gap junctions mediate glucose transport from GLUT1-positive fibrocytes to GLUT1-negative fibrocytes in the spiral limbus.
机译:为了阐明螺旋角膜缘在耳蜗葡萄糖转运中的作用,我们分析了GLUT1,connexin26,connexin30和occludin在大鼠耳蜗的螺旋角膜缘中的表达和定位。在血管中检测到GLUT1和occludin。 GLUT1,connexin26,connexin30和occludin也表达在仅位于im上壁衬细胞基础上的纤维细胞中。连接蛋白26和连接蛋白30不仅存在于这些GLUT 1阳性纤维细胞中,而且还存在于GLUT 1阴性纤维细胞中。使用6- [N-(7-硝基苯-2-氧杂-1,3-二氮杂-4-基)鸟氨酸] -6-脱氧葡萄糖(6-NBDG,MW 342)和伊文思蓝白蛋白(EBA)进行体内葡萄糖成像,MW 68,000)表明6-NBDG迅速分布在整个螺旋角膜缘,而EBA仅局限在血管中。而且,间隙连接解偶联剂庚醇抑制了6-NBDG的分布。这些发现表明,间隙连接在螺旋角膜缘中的葡萄糖转运中起重要作用,即,间隙连接介导葡萄糖从螺旋角膜缘中的GLUT1阳性纤维细胞向GLUT1阴性纤维细胞的转运。

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