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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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Updated: Jun 13, 2026

A Method for Mouse Pancreatic Islet Isolation and Intracellular cAMP Determination
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Published on: June 25, 2014

Re-evaluating Intra-Islet Paracrine Signaling: Precision, Pulsatility and the Path toward Mechanistic Clarity.

Alejandro Tamayo-Garcia1, Dayleen Hakim-Rodriguez1, Rayner Rodriguez-Diaz1

  • 1University of Miami, Miller School of Medicine, Department of Medicine, Division of Endocrinology, USA.

Journal of Biomedical Research & Environmental Sciences
|June 12, 2026
PubMed
Summary

Pancreatic islets act as integrated networks, coordinating hormone release through cell-to-cell signaling. This pulsatile secretion is crucial for glucose homeostasis and is disrupted in type 2 diabetes.

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Area of Science:

  • Endocrinology
  • Metabolic Regulation
  • Cellular Signaling

Background:

  • Pancreatic islets regulate glucose homeostasis via pulsatile insulin and glucagon secretion.
  • Disruption of this rhythmic hormone release is an early event in type 2 diabetes pathogenesis.
  • The precise regulatory mechanisms governing pulsatile hormone secretion remain incompletely understood.

Purpose of the Study:

  • To review emerging insights into pancreatic islet function as integrated oscillatory networks.
  • To highlight the role of intraislet paracrine signaling in coordinating hormone output.
  • To discuss how these intra-islet signals establish systemic glucose thresholds relevant to diabetes.

Main Methods:

  • Review of current literature on pancreatic islet cell communication and hormone pulsatility.
  • Discussion of conceptual advances like Post-Inhibitory Rebound (PIR) responses.
  • Analysis of experimental limitations in studying dynamic paracrine interactions.

Main Results:

  • Pancreatic islets function as integrated oscillatory networks, not just hormone clusters.
  • Intraislet paracrine signaling, including cell-to-cell communication, shapes hormone pulse characteristics.
  • Systemic glucose thresholds delineating normoglycemia, prediabetes, and diabetes are established by intra-islet signals.

Conclusions:

  • Systemic hormone pulsatility arises from coordinated endocrine, neural, and vascular network activity.
  • Advanced techniques like high-resolution perifusion and live-cell biosensor imaging are needed to study dynamic paracrine interactions.
  • Understanding these mechanisms is critical for addressing the dysregulation of hormone pulsatility in diabetes.