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Related Concept Videos

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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Related Experiment Video

Updated: Jun 12, 2026

In situ Quantification of Pancreatic Beta-cell Mass in Mice
09:50

In situ Quantification of Pancreatic Beta-cell Mass in Mice

Published on: June 7, 2010

Imaging of beta-cell mass and function.

Masanori Ichise1, Paul E Harris

  • 1Department of Radiology, Columbia University Medical College, New York, New York 11032, USA. mi2193@columbia.edu

Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine
|June 18, 2010
PubMed
Summary
This summary is machine-generated.

Identifying biomarkers for beta-cell mass (BCM) is crucial for diabetes treatment. VMAT2 PET imaging shows promise for noninvasively visualizing BCM, aiding in therapeutic development for diabetes mellitus.

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Area of Science:

  • Endocrinology
  • Nuclear Medicine
  • Diabetes Research

Background:

  • Type 1 and type 2 diabetes mellitus are characterized by loss of insulin-producing beta-cell mass (BCM).
  • Therapeutic strategies aim to restore BCM through neogenesis, regeneration, or apoptosis prevention.
  • Accurate biomarkers are essential for monitoring BCM and evaluating therapeutic efficacy.

Purpose of the Study:

  • To evaluate the potential of VMAT2 PET imaging as a noninvasive biomarker for beta-cell mass.
  • To assess the feasibility of quantifying VMAT2 binding in the pancreas for BCM assessment.

Main Methods:

  • Utilized positron emission tomography (PET) with (11)C-dihydrotetrabenazine or derivatives to target vesicular monoamine transporter type 2 (VMAT2).
  • Focused on VMAT2, a marker highly expressed in beta-cells and associated with insulin.
  • Employed kinetic modeling for quantitative analysis of VMAT2 binding within the pancreas.

Main Results:

  • VMAT2 PET successfully detected the VMAT2 signal in the pancreas, despite the low abundance and dispersed nature of beta-cells.
  • Demonstrated the capability for kinetic model-based quantification of VMAT2 binding.
  • Showcased the potential for noninvasive assessment of BCM.

Conclusions:

  • VMAT2 PET imaging is a promising technique for noninvasively assessing beta-cell mass in diabetes.
  • Further technical development and clinical validation are required for its use as a reliable biomarker.
  • This imaging modality could significantly impact the development and monitoring of diabetes therapies.