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Glucose Absorption Into the Small Intestine01:26

Glucose Absorption Into the Small Intestine

Complex carbohydrates consumed cannot be absorbed into the small intestine in their original form. First, they must be hydrolyzed to a monosaccharide form such as glucose or galactose. These monosaccharides are then transported across the intestinal membrane and into the blood via transcellular transport. The intestinal epithelial cells allow the movement of these monosaccharides with a defined 'entry' through membrane transporter proteins present on their apical membrane and 'exit' via the...
Insulin Secretory Vesicles01:05

Insulin Secretory Vesicles

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...
Tissue Renewal without Stem Cells01:23

Tissue Renewal without Stem Cells

After cellular or tissue damage, the resident stem cells present in the human body can locally repair and regenerate the damaged tissue or organ. However, even though some tissues do not have stem cells, they can repair and regenerate with the help of pre-existing cells. For example, beta cells of the pancreas and hepatocytes of the liver can divide to renew and regenerate the tissue. Here, both cell division and cell death are well regulated by homeostasis.
However, failure of such a system...
Cells and Secretions of the Pancreas01:16

Cells and Secretions of the Pancreas

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...
Hormones Regulating Blood Glucose01:16

Hormones Regulating Blood Glucose

Insulin is released by beta cells of the pancreas when blood glucose levels are high. It facilitates glucose absorption and utilization in insulin-dependent cells with insulin receptors on their plasma membranes. Insulin promotes glucose uptake by increasing the number of glucose transport proteins in the cell membrane, allowing glucose to enter the cell. As a result, glucose utilization and ATP production are enhanced.
In addition to accelerating glucose uptake and utilization, insulin has...
Glucose Homeostasis: Pancreatic Islets and Insulin Secretion01:27

Glucose Homeostasis: Pancreatic Islets and Insulin Secretion

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 co-secreted in...

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関連する実験動画

Updated: Jul 8, 2026

Assessing Replication and Beta Cell Function in Adenovirally-transduced Isolated Rodent Islets
09:31

Assessing Replication and Beta Cell Function in Adenovirally-transduced Isolated Rodent Islets

Published on: June 25, 2012

ミトコンドリアの機能は,正常なベータ細胞と糖尿病のベータ細胞において同じである.

P Maechler1, C B Wollheim

  • 1Division of Clinical Biochemistry, Department of Internal Medicine, University Medical Centre, 1211 Geneva 4, Switzerland. pierre.maechler@medecine.unige.ch

Nature
|December 14, 2001
PubMed
まとめ
この要約は機械生成です。

ミトコンドリアの糖尿病は,珍しい2型糖尿病の形態であり,ミトコンドリアのDNA変異による臓β細胞機能不全に起因する. これらの変異はミトコンドリアを損なう.

さらに関連する動画

High-resolution Respirometry to Measure Mitochondrial Function of Intact Beta Cells in the Presence of Natural Compounds
12:32

High-resolution Respirometry to Measure Mitochondrial Function of Intact Beta Cells in the Presence of Natural Compounds

Published on: January 23, 2018

Analysis of Beta-cell Function Using Single-cell Resolution Calcium Imaging in Zebrafish Islets
08:50

Analysis of Beta-cell Function Using Single-cell Resolution Calcium Imaging in Zebrafish Islets

Published on: July 3, 2018

関連する実験動画

Last Updated: Jul 8, 2026

Assessing Replication and Beta Cell Function in Adenovirally-transduced Isolated Rodent Islets
09:31

Assessing Replication and Beta Cell Function in Adenovirally-transduced Isolated Rodent Islets

Published on: June 25, 2012

High-resolution Respirometry to Measure Mitochondrial Function of Intact Beta Cells in the Presence of Natural Compounds
12:32

High-resolution Respirometry to Measure Mitochondrial Function of Intact Beta Cells in the Presence of Natural Compounds

Published on: January 23, 2018

Analysis of Beta-cell Function Using Single-cell Resolution Calcium Imaging in Zebrafish Islets
08:50

Analysis of Beta-cell Function Using Single-cell Resolution Calcium Imaging in Zebrafish Islets

Published on: July 3, 2018

科学分野:

  • エンドクリノロジー エンドクリノロジー
  • 遺伝学 遺伝学とは
  • 細胞生物学 細胞生物学

背景:

  • 2型糖尿病の病因は完全に解明されていません.
  • ミトコンドリア糖尿病は,臓のβ細胞に影響するミトコンドリアDNA変異によって引き起こされる希少なサブタイプです.
  • ミトコンドリアは,インスリン分泌の調節に重要な役割を果たします.

研究 の 目的:

  • 2型糖尿病におけるミトコンドリア機能障害の役割を明らかにする.
  • ミトコンドリアDNAの変異がベータ細胞機能とインスリン分泌にどのように影響するかを理解する.

主な方法:

  • ミトコンドリア糖尿病の症例におけるβ細胞機能の分析.
  • ミトコンドリアDNA変異とその細胞プロセスへの影響に関する研究.
  • インスリン分泌機構の評価.

主要な成果:

  • ミトコンドリアDNAの変異は,臓β細胞の機能不全につながる.
  • ミトコンドリア機能の障害は,栄養素代謝とインスリンエクソサイトーシスの結合に影響します.
  • ミトコンドリアによるATP合成は,カルシウム流入とインスリン放出に不可欠です.

結論:

  • ミトコンドリア機能障害は,特定のタイプの糖尿病の重要な要因です.
  • これらのメカニズムの理解は,糖尿病の将来の治療戦略に情報を与えることができます.
  • グルタミン酸は,ベータ細胞機能に関与する潜在的な細胞内伝達物質です.