SLC30A 家族在人类和小鼠胰岛中的表达:β 细胞中的细胞定位。

SLC30A family expression in the pancreatic islets of humans and mice: cellular localization in the β-cells.

机构信息

Graduate Group of Nutritional Biology, Department of Nutrition, University of California Davis, One Shields Ave, Davis, CA, 95616, USA.

Obesity and Metabolism Research Unit, USDA/ARS/Western Human Nutrition Research Center, 430 West Health Sciences Drive, Davis, CA, 95616, USA.

出版信息

J Mol Histol. 2018 Apr;49(2):133-145. doi: 10.1007/s10735-017-9753-0. Epub 2018 Jan 25.

Abstract

Zinc is a vital co-factor for insulin metabolism in the pancreatic β-cell, involved in synthesis, maturation, and crystallization. Two families of zinc transporters, namely SLC30A (ZNT) and SLC39A (ZIP) are involved in maintaining cellular zinc homeostasis in mammalian cells. Single nuclear polymorphisms or mutations in zinc transporters have been associated with insulin resistance and risk of type 2 diabetes (T2D) in both humans and mice. Thus, mice can be useful for studying the underlying mechanisms of zinc-associated risk of T2D development. To determine potential differences in zinc transporter expression and cellular localization in the pancreatic β-cells between humans and mice, we examined all members (ZNT1-10) of the ZNT family in pancreatic islets and in β-cell lines derived from both species using immunohistochemistry and immunofluorescence microscopic analysis. We found that there were no substantial differences in the expression of nine ZNT proteins in the human and mouse islets and β-cells with exception of ZNT3, which was only detected in human β-cells, but not in mouse β-cells. Moreover, we found that ZNT2 was localized on the cell surface of both human and mouse β-cells, suggesting a role of ZNT2 in direct export of zinc out of the β-cell. Together, our study suggests functional conservations of the ZNT proteins between humans and mice. We believe that our results are of interest for future studies in the association of zinc metabolism with risk of T2D in humans using mouse models.

摘要

锌是胰腺β细胞胰岛素代谢的重要辅助因子,参与胰岛素的合成、成熟和结晶。两种锌转运体家族,即 SLC30A(ZNT)和 SLC39A(ZIP),参与维持哺乳动物细胞的细胞内锌稳态。锌转运体的单一核多态性或突变与人类和小鼠的胰岛素抵抗和 2 型糖尿病(T2D)风险有关。因此,小鼠可用于研究与 T2D 发展相关的锌风险的潜在机制。为了确定人类和小鼠胰腺β细胞中锌转运体表达和细胞定位的潜在差异,我们使用免疫组织化学和免疫荧光显微镜分析,检查了 ZNT 家族的所有成员(ZNT1-10)在胰岛和两种物种来源的β细胞系中的表达。我们发现,除了仅在人β细胞中检测到但在鼠β细胞中未检测到的 ZNT3 外,九种 ZNT 蛋白在人胰岛和β细胞中的表达没有实质性差异。此外,我们发现 ZNT2 定位于人β细胞和鼠β细胞的细胞表面,这表明 ZNT2 在锌从β细胞直接输出中的作用。总之,我们的研究表明 ZNT 蛋白在人类和小鼠之间具有功能保守性。我们相信,我们的结果对于使用小鼠模型研究锌代谢与人类 T2D 风险之间的关系的未来研究具有重要意义。

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