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相关概念视频

Insulin Secretory Vesicles01:05

Insulin Secretory Vesicles

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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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GPCRs Regulate Adenylyl Cylase Activity01:09

GPCRs Regulate Adenylyl Cylase Activity

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Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of...
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Rab Cascades01:25

Rab Cascades

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Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
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Cells and Secretions of the Pancreas01:16

Cells and Secretions of the Pancreas

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The pancreas, a vital organ within the abdominal cavity, plays dual roles in the digestive and endocrine systems, collaborating with exocrine and endocrine cells to maintain optimal digestion and blood sugar levels.
Exocrine function is carried out by acinar cells, organized into clusters known as acini. These cells contribute to digestion by releasing substantial quantities of enzyme-rich, alkaline digestive juices.
Concurrently, the dispersed clusters of endocrine cells throughout the...
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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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Overview of Secretory Vesicles01:33

Overview of Secretory Vesicles

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Secretory vesicles, also known as dense core vesicles (DCVs), are membrane-bound vesicles that transport secretory proteins, such as hormones or neurotransmitters. Regulated secretory vesicles transport proteins from the trans-Golgi network to the exterior of the cell. Proteins present in regulated secretory vesicles are required to be rapidly exocytosed in large amounts upon a specific stimulus.
Various proteins regulate the aggregation of molecules inside the secretory vesicles. Chromogranins...
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相关实验视频

Updated: Jun 13, 2025

Confocal Laser Scanning Microscopy of Calcium Dynamics in Acute Mouse Pancreatic Tissue Slices
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在胰腺疾病中,RalGAP复合体控制分泌和初级乳毛.

Lisa H Apken1, Hannah Barz2, Stephanie Beel1

  • 1Institute of Molecular Tumor Biology, Faculty of Medicine, University Münster, Münster, Germany.

Life science alliance
|June 9, 2025
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概括

胰腺RalGAPβ缺乏会通过破坏细胞通路引起炎症和瘤. 这突出了RalGAP/Ral信号.

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Assessing the Secretory Capacity of Pancreatic Acinar Cells
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Assessing the Secretory Capacity of Pancreatic Acinar Cells
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科学领域:

  • 分子生物学分子生物学
  • 癌症研究 癌症研究
  • 细胞信号传递 细胞信号传递

背景情况:

  • κB-Ras/RalGAP复合体调节EGFR/Ras信号传递中的Ral GTPase活性.
  • 在胰腺癌中,RalGAP的表达减少,但其体内作用尚不清楚.

研究的目的:

  • 研究RalGAP和Ral GTPases在胰腺瘤发育中的作用.
  • 阐明RalGAP缺乏影响状细胞功能和再生的机制.

主要方法:

  • 在体内对胰腺RalGAPβ缺乏症的分析.
  • 在细胞中研究分泌途径和外细胞的研究.
  • 评估初级毛组合和毛再生.
  • 与致癌性KRASG12D突变的组合研究.

主要成果:

  • 胰腺RalGAPβ缺陷本身就会诱导炎症和瘤.
  • 缺陷会破坏分泌通路,极化细胞外形成和初级膜组合.
  • 在与KRASG12D结合时,RalGAPβ缺乏会加速瘤的发展,并降低存活率.

结论:

  • RalGAP复合体保持Ral活动的空间控制和acinar细胞的身份.
  • RalGAP/Ral信号传递对于预防胰腺癌的发展至关重要.
  • κB-Ras蛋白特别需要用于初级毛形成,而不是所有RalGAP功能.