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Related Concept Videos

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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.
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Diabetes mellitus is a chronic metabolic disorder characterized by hyperglycemia. The four categories of diabetes are type 1 diabetes, type 2 diabetes, other specific types of diabetes, and gestational diabetes.
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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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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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Type 2 diabetes, characterized by insulin resistance, arises when the insulin receptors on cells lose responsiveness to insulin, diminishing the cell's capacity to take up glucose, resulting in elevated blood glucose levels. To receive a diagnosis of Type 2 diabetes, a series of blood glucose tests are necessary to assess whether the blood glucose falls within normal parameters. If the result is out of the normal range, a patient may be diagnosed as prediabetic or diabetic, depending on the...
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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.
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Related Experiment Video

Updated: Aug 4, 2025

Single-cell Transcriptomic Analyses of Mouse Pancreatic Endocrine Cells
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Pancreatic islet cell type-specific transcriptomic changes during pregnancy and postpartum.

Jin-Yong Chung1, Yongjie Ma2, Dingguo Zhang3

  • 1Division of Endocrinology, Diabetes & Metabolism, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21224, USA.

Iscience
|April 6, 2023
PubMed
Summary
This summary is machine-generated.

Pregnancy dynamically alters pancreatic beta-cell mass and function. This study reveals specific gene expression changes in beta-cells and other islet cells during pregnancy and postpartum, highlighting immediate-early gene responses.

Keywords:
Molecular physiologyPregnancyTranscriptomics

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Area of Science:

  • Endocrinology
  • Reproductive Biology
  • Genomics

Background:

  • Maternal glucose homeostasis is challenged during pregnancy, necessitating adaptations in pancreatic beta-cell function.
  • Pancreatic beta-cell mass undergoes significant expansion during gestation and regression postpartum.

Purpose of the Study:

  • To elucidate the transcriptional mechanisms underlying beta-cell adaptation during pregnancy and postpartum.
  • To investigate cell type-specific changes within pancreatic islets in response to reproductive state.

Main Methods:

  • Single-cell RNA sequencing (scRNA-seq) was employed on pancreatic islets from virgin, late-gestation, and early-postpartum mice.
  • Transcriptional profiles of beta-cells and other islet cell types were analyzed to identify dynamic changes.

Main Results:

  • Specific transcriptional signatures were identified in beta-cells during gestation and the postpartum period.
  • Upregulation of AP-1 transcription factor subunits and immediate-early response genes (IEGs) was observed in beta-cells.
  • Pregnancy- and postpartum-induced transcriptional changes varied across different endocrine cell types, as well as in islet endothelial and antigen-presenting cells.

Conclusions:

  • The study reveals cell type-specific transcriptional adaptations within the pancreatic islets during pregnancy and postpartum.
  • These findings provide insights into the molecular regulation of islet cell plasticity in response to reproductive demands.