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Related Concept Videos

Diabetes Mellitus: Type 2 and Gestational01:22

Diabetes Mellitus: Type 2 and Gestational

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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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Pathophysiology of Diabetes01:20

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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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Glucose Homeostasis: Pancreatic Islets and Insulin Secretion01:27

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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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Insulin Secretory Vesicles01:05

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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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Carbohydrate Metabolism01:36

Carbohydrate Metabolism

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Carbohydrates are polymers composed of molecules containing atoms of carbon, hydrogen and oxygen. One gram of carbohydrate can provide four kilo-calories of energy, which makes it the most efficient instant energy source.
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Hormones Regulating Blood Glucose01:16

Hormones Regulating Blood Glucose

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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: Mar 15, 2026

A High-content In Vitro Pancreatic Islet β-cell Replication Discovery Platform
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A High-content In Vitro Pancreatic Islet β-cell Replication Discovery Platform

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β-Cell adaptation in pregnancy.

L Baeyens1,2, S Hindi1,2,3, R L Sorenson4

  • 1Diabetes Center, University of California San Francisco, San Francisco.

Diabetes, Obesity & Metabolism
|September 13, 2016
PubMed
Summary
This summary is machine-generated.

Pregnancy requires pancreatic beta-cells to expand and adapt to changing glucose metabolism. This review explores how placental lactogens drive beta-cell adaptation, crucial for preventing gestational diabetes.

Keywords:
Htr1dHtr2bHtr3agestational diabetesinsulinplacentaplacental lactogenpregnancyserotoninβ-cell

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Area of Science:

  • Endocrinology
  • Metabolic Physiology
  • Reproductive Biology

Background:

  • Pregnancy significantly alters maternal glucose metabolism, increasing insulin resistance.
  • Pancreatic beta-cells (β-cells) must adapt by increasing in number and function to meet heightened insulin demands.
  • This adaptation is critical for maintaining glucose homeostasis during gestation.

Purpose of the Study:

  • To review the adaptive mechanisms of pancreatic β-cells during pregnancy.
  • To explore the role of placental lactogens and prolactin receptors in β-cell expansion.
  • To summarize human β-cell adaptation and the pathophysiology of gestational diabetes.

Main Methods:

  • Review of existing literature on β-cell adaptation in pregnancy.
  • Analysis of molecular signaling pathways involved in β-cell compensation.
  • Comparison of rodent and human pregnancy models.

Main Results:

  • Placental lactogens stimulate β-cell proliferation via the prolactin receptor in rodents.
  • β-cell mass increases early in pregnancy and contracts post-partum.
  • Failure of β-cell adaptation can lead to gestational diabetes.

Conclusions:

  • Understanding β-cell adaptation to pregnancy is key to addressing gestational diabetes.
  • Targeting lactogen signaling may offer therapeutic strategies for metabolic disorders during pregnancy.
  • Further research into human β-cell responses can improve prediction and prevention of gestational diabetes.