...
首页> 外文期刊>Cell metabolism >The Pericyte of the Pancreatic Islet Regulates Capillary Diameter and Local Blood Flow
【24h】

The Pericyte of the Pancreatic Islet Regulates Capillary Diameter and Local Blood Flow

机译:胰岛胰岛的细胞调节毛细管直径和局部血流

获取原文
获取原文并翻译 | 示例
           

摘要

Efficient insulin secretion requires a well-functioning pancreatic islet microvasculature. The dense network of islet capillaries includes the islet pericyte, a cell that has barely been studied. Here we show that islet pericytes help control local blood flow by adjusting islet capillary diameter. Islet pericytes cover 40% of the microvasculature, are contractile, and are innervated by sympathetic axons. Sympathetic adrenergic input increases pericyte activity and reduces capillary diameter and local blood flow. By contrast, activating beta cells by increasing glucose concentration inhibits pericytes, dilates islet capillaries, and increases local blood flow. These effects on pericytes are mediated by endogenous adenosine, which is likely derived from ATP co-released with insulin. Pericyte coverage of islet capillaries drops drastically in type 2 diabetes, suggesting that, under diabetic conditions, islets lose this mechanism to control their own blood supply. This may lead to inadequate insulin release into the circulation, further deteriorating glycemic control.
机译:高效的胰岛素分泌需要良好的胰岛胰岛微血管结构。胰岛毛细血管的密集网络包括胰岛细胞,几乎没有研究过的细胞。在这里,我们表明胰岛周细胞通过调节胰岛毛细管直径来帮助控制局部血流。胰岛素覆盖40%的微血管,是收缩的,并通过交感神经轴理地神经。交感神经肾上腺素能输入增加了周细胞活性并降低了毛细管直径和局部血流。相比之下,通过增加葡萄糖浓度来激活β细胞抑制周细胞,扩张胰岛毛细血管,并增加局部血流。这些对周细胞的影响是由内源性腺苷介导的,其可能来自于与胰岛素共同释放的ATP。胰岛毛细血管的周围覆盖率在2型糖尿病中均急剧下降,表明,在糖尿病条件下,胰岛失去了这种机制来控制自己的血液供应。这可能导致胰岛素释放不足,进一步恶化血糖控制。

著录项

  • 来源
    《Cell metabolism》 |2018年第3期|共19页
  • 作者单位

    Univ Miami Miller Sch Med Dept Med Div Endocrinol Diabet &

    Metab Miami FL 33136 USA;

    Univ Miami Miller Sch Med Dept Med Div Endocrinol Diabet &

    Metab Miami FL 33136 USA;

    Univ Miami Miller Sch Med Dept Med Div Endocrinol Diabet &

    Metab Miami FL 33136 USA;

    Univ Miami Miller Sch Med Dept Med Div Endocrinol Diabet &

    Metab Miami FL 33136 USA;

    Univ Miami Miller Sch Med Dept Med Div Endocrinol Diabet &

    Metab Miami FL 33136 USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 内分泌腺疾病及代谢病;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号