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相关概念视频

Feedback Regulation of Calcium Concentration01:27

Feedback Regulation of Calcium Concentration

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Calcium is an essential signaling molecule required for various cellular functions. Calcium pumps and ion channels on cell and organellar membranes, such as those on the endoplasmic reticulum (ER), regulate calcium concentrations inside the cell. They remain closed, keeping the cytosolic calcium levels low at a resting state.
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Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
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Calcitonin, a vital polypeptide hormone, regulates calcium levels within body fluids. It is released by the parafollicular cells, also known as C cells, situated in the follicular epithelium of the thyroid gland. Calcitonin responds to fluctuations in blood calcium levels and the influence of gastrointestinal hormones like gastrin and cholecystokinin.
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Insulin secretory vesicles release insulin to stimulate blood glucose uptake and regulate carbohydrate metabolism. When the blood glucose levels increase, glucose enters the pancreatic β-islet cells through glucose transporters. Once inside, glucose is metabolized through glycolysis, the citric acid cycle, and the electron transport chain, producing ATP. This increase in ATP concentration closes ATP-sensitive potassium channels, leading to depolarization of the membrane and the opening of...
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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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Analysis of Beta-cell Function Using Single-cell Resolution Calcium Imaging in Zebrafish Islets
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加勒-3 损害了过渡性和β细胞功能.

Qian Jiang1,2,3, Qijin Zhao1,2,3, Yibing Chen1,2,3

  • 1State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China.

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概括

在糖尿病中高的加勒-3 (Gal3) 通过影响胰腺β细胞中的通道来降低胰岛素分泌. 抑制Gal3可以改善葡萄糖的控制,这表明它是2型糖尿病的治疗点.

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科学领域:

  • 内分泌学 在内分泌学.
  • 免疫学 免疫学 免疫学
  • 代谢性疾病研究研究.

背景情况:

  • 糖尿病期间胰腺小岛的巨细胞和炎症增加,与β细胞功能障碍相关.
  • 主要来自巨细胞的 Galectin-3 (Gal3) 在高脂肪饮食 (HFD) 养的小岛和糖尿病db/db小鼠中升高.

研究的目的:

  • 研究加勒-3 (Gal3) 在胰腺β细胞功能障碍中的作用及其作为2型糖尿病治疗点的潜力.

主要方法:

  • 从HFD养和db/db小鼠的小岛中评估了Gal3水平.
  • 在体外和体内检查了Gal3对葡萄糖刺激胰岛素分泌 (GSIS) 的作用.
  • 研究了Gal3与电压通道辅助子单元玛1 (CACNG1) 之间的相互作用.
  • 在小鼠模型中评估了Gal3抑制对葡萄糖平衡的影响.

主要成果:

  • 在小鼠和人类的β细胞系和初级小岛上,Gal3急剧降低了GSIS.
  • 3与CACNG1结合,抑制流入和随后的GSIS.
  • 贝塔细胞特异性的CACNG1缺陷模仿了Gal3治疗效果.
  • 对Gal3的遗传或药理抑制显著改善了HFD养和db/db养小鼠的GSIS和葡萄糖平衡.

结论:

  • 加勒-3在与2型糖尿病相关的胰腺β细胞功能障碍中发挥着关键作用.
  • 3的机制包括通过CACNG1.1抑制的流入.
  • 抑制Gal3是一种有前途的治疗策略,用于改善2型糖尿病中葡萄糖平衡.