A C-peptide complex with albumin and Zn(2+) increases measurable GLUT1 levels in membranes of human red blood cells.

A C-peptide complex with albumin and Zn(2+) increases measurable GLUT1 levels in membranes of human red blood cells.
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DOI:
10.1038/s41598-020-74527-6
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发表时间:
2020-10-15
期刊:
影响因子:
4.6
通讯作者:
Spence D
Spence D
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Geiger M;Janes T;Keshavarz H;Summers S;Pinger C;Fletcher D;Zinn K;Tennakoon M;Karunarathne A;Spence D

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1型糖尿病(T1D)患者需要外源性胰岛素,这会刺激GLUT4葡萄糖转运体转移到细胞膜上。然而,大多数血液细胞含有GLUT1,不受胰岛素的直接影响。在这里,我们报道了C-肽,体内与胰岛素分泌等量的31个氨基酸的多肽,是影响红细胞膜的三组分复合体的一部分。多种技术被用来证明饱和的和特定的C-肽与红细胞结合时,作为与白蛋白的复合体的一部分。重要的是,当络合物还包括锌离子时,测量到细胞膜GLUT1显著增加,从而提供了类似于胰岛素的细胞效应,但对胰岛素不起作用的转运蛋白。
People with type 1 diabetes (T1D) require exogenous administration of insulin, which stimulates the translocation of the GLUT4 glucose transporter to cell membranes. However, most bloodstream cells contain GLUT1 and are not directly affected by insulin. Here, we report that C-peptide, the 31-amino acid peptide secreted in equal amounts with insulin in vivo, is part of a 3-component complex that affects red blood cell (RBC) membranes. Multiple techniques were used to demonstrate saturable and specific C-peptide binding to RBCs when delivered as part of a complex with albumin. Importantly, when the complex also included Zn2+, a significant increase in cell membrane GLUT1 was measured, thus providing a cellular effect similar to insulin, but on a transporter on which insulin has no effect.
DOI: 10.1152/ajpgi.1983.245.1.g13
发表时间: 1983-01-01
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