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Assessing Replication and Beta Cell Function in Adenovirally-transduced Isolated Rodent Islets
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Beta-cell function and mass in type 2 diabetes.

Marianne O Larsen1

  • 1Department of GLP-1 and Obesity Pharmacology, Novo Nordisk A/S, Denmark. mmla@novonordisk.com

Danish Medical Bulletin
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PubMed
Summary
This summary is machine-generated.

This study developed a minipig model to investigate type 2 diabetes, finding that obesity, not just reduced beta-cell mass, impairs insulin secretion pulsatility. This research supports using in vivo insulin secretion tests to estimate beta-cell mass in humans.

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Area of Science:

  • Endocrinology and Metabolism
  • Diabetes Research
  • Animal Models

Background:

  • Type 2 diabetes (T2DM) involves impaired beta-cell function (BCF) and mass (BCM), but the precise roles of reduced BCM and obesity in pulsatile insulin secretion defects are unclear.
  • High-frequency pulsatile insulin secretion is a key aspect of BCF, yet its clinical relevance and disturbances in T2DM pathogenesis require further investigation.
  • Accurate in vivo assessment of BCM is crucial for understanding diabetes progression and evaluating therapeutic interventions, but current methods are limited in humans.

Purpose of the Study:

  • To establish and characterize a minipig model of reduced BCM and mild diabetes to study the impact of primary BCM reduction and/or obesity on BCF, particularly pulsatile insulin secretion.
  • To determine if in vivo BCF evaluation can serve as a surrogate marker for predicting BCM across varying BCM and body weights in minipigs.
  • To investigate the relationship between BCM, obesity, and disturbances in rapid pulsatile insulin secretion in the context of T2DM pathogenesis.

Main Methods:

  • Developed a minipig model of reduced BCM and mild diabetes using streptozotocin (STZ) and nicotinamide (NIA) administration.
  • Characterized the model using mixed-meal oral glucose tolerance tests, intravenous glucose and arginine stimulation, and pancreatic histology.
  • Assessed rapid pulsatile insulin secretion in normal and modified minipigs, and correlated in vivo BCF measurements (including glucose/arginine stimulation and pulsatility analysis) with ex vivo BCM determined by stereology.

Main Results:

  • The NIA/STZ minipig model successfully replicated key features of T2DM, including hyperglycemia, reduced insulin secretion, and decreased BCM.
  • Reduced BCM led to decreased insulin pulse mass but did not alter pulse periodicity or glucose entrainability; obesity, however, was linked to reduced pulsatile insulin secretion and improved glucose entrainment.
  • Combined glucose and arginine stimulation showed the strongest correlation with BCM, supporting its use as a surrogate marker, while rapid pulsatile insulin secretion analysis did not offer a superior correlation.

Conclusions:

  • Disturbances in rapid pulsatile insulin secretion observed in T2DM may be more closely related to obesity than to a primary reduction in BCM.
  • The developed minipig model provides a valuable tool for studying T2DM pathophysiology, including the distinct effects of BCM reduction and obesity on BCF.
  • In vivo assessment of BCF, particularly via combined glucose and arginine stimulation, can reliably estimate BCM, offering potential for future clinical applications in diabetes diagnosis and treatment monitoring.