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Related Concept Videos

Peroxisomes01:24

Peroxisomes

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Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...
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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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Protein Import into the Peroxisomes01:27

Protein Import into the Peroxisomes

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Cells contain membrane-bound organelles called peroxisomes that oxidize organic molecules by transferring hydrogen atoms to oxygen, producing hydrogen peroxide. Peroxisomes enzymatically convert the released hydrogen peroxide into water and oxygen.
Peroxisomal Protein Import:
Peroxisomes lack the genetic machinery required to code for their own proteins. Hence, most peroxisomal membrane, lumenal and transmembrane proteins are synthesized in the cytoplasm or ER and transported to the peroxisome...
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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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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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Overview of Lipid Metabolism01:24

Overview of Lipid Metabolism

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Lipid metabolism is a crucial process in the human body that involves the synthesis and degradation of lipids. This process is essential for energy production, cell membrane formation, and hormone production, among other functions.
Lipolysis: The Breakdown of Lipids:
Lipolysis is the process of breaking down lipids, particularly triglycerides, into glycerol and fatty acids. This process typically occurs in the adipose tissue and is triggered by various hormones, including glucagon and...
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Updated: Nov 22, 2025

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

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Peroxisomes and pancreatic beta-cell lipo-dysfunction.

Helen R Blair1, Cara Tomas1, Satomi Miwa2

  • 1Translational & Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, UK.

Journal of Diabetes and Its Complications
|January 9, 2021
PubMed
Summary
This summary is machine-generated.

Targeting peroxisomes via Pex11β knockdown reduced reactive oxygen species and reversed palmitate-induced insulin secretion defects in pancreatic beta cells, offering new insights into type 2 diabetes.

Keywords:
Fatty acid oxidationInsulin secretionLipotoxicityPeroxisomeReactive oxygen speciesType 2 diabetes

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Area of Science:

  • Cell Biology
  • Metabolic Diseases
  • Endocrinology

Background:

  • Pancreatic beta-cell lipo-dysfunction, characterized by impaired insulin secretion, is a key factor in type 2 diabetes development.
  • Peroxisomes play a role in cellular lipid metabolism, and their dysfunction may contribute to beta-cell failure.

Purpose of the Study:

  • To investigate the specific role of peroxisomes in palmitate-induced pancreatic beta-cell dysfunction.
  • To determine the effect of Pex11β knockdown, a regulator of peroxisome abundance, on beta-cell function.

Main Methods:

  • MIN6 cells were transfected to knockdown Pex11β, a peroxisome regulator.
  • Peroxisome abundance was assessed via PMP-70 protein expression.
  • Cells were treated with palmitate or BSA, followed by measurements of glucose-stimulated insulin secretion and reactive oxygen species (ROS).

Main Results:

  • Pex11β knockdown significantly reduced peroxisome abundance.
  • Palmitate-induced reduction in insulin secretion was significantly attenuated in Pex11β knockdown cells compared to controls.
  • Reactive oxygen species generation in response to palmitate was lower in Pex11β knockdown cells.

Conclusions:

  • Pex11β knockdown mitigates palmitate-induced beta-cell dysfunction by reducing peroxisome abundance and ROS generation.
  • Peroxisomes play a critical role in mediating the detrimental effects of palmitate on pancreatic beta-cell insulin secretion.