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相关概念视频

Glucose Homeostasis: Pancreatic Islets and Insulin Secretion01:27

Glucose Homeostasis: Pancreatic Islets and Insulin Secretion

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The pancreatic islets comprising only 1%-2% of the volume are highly vascularized and innervated mini-organs. They contain five endocrine cell types, including β cells that secrete insulin, which is synthesized as a single polypeptide chain, preproinsulin, processed to proinsulin, and finally to insulin and C-peptide. This process is complex and regulated, involving the Golgi complex, the endoplasmic reticulum, and the secretory granules of the β cell.
Insulin and C-peptide are...
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cAMP-dependent Protein Kinase Pathways01:25

cAMP-dependent Protein Kinase Pathways

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Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
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相关实验视频

Updated: Jun 12, 2025

Measurement of Insulin- and Contraction-Stimulated Glucose Uptake in Isolated and Incubated Mature Skeletal Muscle from Mice
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运动在小鼠和人类的胰腺小岛中激活AMPK,以减少衰老.

Priscila Carapeto1,2, Kanako Iwasaki1, Francesko Hela1

  • 1Joslin Diabetes Center, Harvard Medical School, Boston, MA, USA.

Nature metabolism
|September 24, 2024
PubMed
概括
此摘要是机器生成的。

耐力运动减少β细胞衰老,这是2型糖尿病的一个因素. 这种效应与葡萄糖和AMPK激活的增加有关,为糖尿病管理提供了潜在的新疗法.

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A Method for Mouse Pancreatic Islet Isolation and Intracellular cAMP Determination
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A Method for Mouse Pancreatic Islet Isolation and Intracellular cAMP Determination

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相关实验视频

Last Updated: Jun 12, 2025

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A Method for Mouse Pancreatic Islet Isolation and Intracellular cAMP Determination
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科学领域:

  • 细胞生物学 细胞生物学
  • 内分泌学 在内分泌学.
  • 代谢性疾病是一种代谢性疾病.

背景情况:

  • 贝塔细胞衰老与2型糖尿病 (T2DM) 有关.
  • 运动会影响衰老标志物,但其对β细胞衰老的影响尚不清楚.

研究的目的:

  • 研究耐力训练对胰岛素耐药模型中的β细胞衰老的影响.
  • 阐明运动诱导的β细胞衰老变化背后的分子机制.

主要方法:

  • 在小鼠胰岛素抵抗模型中进行短期耐力运动 (跑步机运行).
  • 在体内和体外实验评估β细胞衰老标志物的实验.
  • 对血清葡萄糖素,AMPK信号传递和NRF2核转位的分析.
  • 人类T2DM小岛的治疗来自训练有素的供体血清.

主要成果:

  • 在小鼠模型中,运动训练降低了β细胞衰老.
  • 这种效应是由血清葡萄糖的增加引起的,激活了β细胞中的AMPK信号传递.
  • 激活AMPK导致NRF2核转移,并减少衰老标志物.
  • 用炼血清治疗的人类T2DM岛屿显示衰老标志物减少.

结论:

  • 运动训练可以减少胰腺β细胞衰老.
  • 该机制涉及葡萄糖-AMPK-NRF2信号传递.
  • 运动通过准β细胞衰老来证明T2DM的治疗潜力.