Cited by 101Pancreatic function and diabetesIon channel regulation and functionDiabetes Treatment and Management

Different effects of tolbutamide and diazoxide in alpha, beta-, and delta-cells within intact islets of Langerhans.

Quesada, I, Nadal, A, Soria, B·1999·Diabetes

Abstract

Interaction between the different types of cells within the islet of Langerhans is vital for adequate control of insulin release. Once insulin secretion becomes defective, as in type 2 diabetes, the most useful drugs to increase insulin release are sulfonylureas. It is well-known that sulfonylureas block K(ATP) channels, which results in depolarization of the membrane that provokes calcium influx and increases intracellular calcium concentration ([Ca2+]i), which thereby triggers insulin secretion. The sulfonamide diazoxide produces the opposite effect: it activates K(ATP) channels, resulting in a decreased insulin secretion. Despite such evidence, little is known about the effect of sulfonylureas and sulfonamides in non-beta-cells of the islet of Langerhans. In this article, we describe the effects of tolbutamide and diazoxide on [Ca2+]i in alpha-, beta-, and delta-cells within intact islets of Langerhans. Tolbutamide elicits an increase in [Ca2+li in beta- and delta-cells, regardless of glucose concentrations. Remarkably, tolbutamide is without effect in alpha-cells. When diazoxide is applied, glucose-induced [Ca2+]i oscillations in beta- and delta-cells are abolished, whereas [Ca2+]i oscillations in alpha-cells remain unaltered. Furthermore, the existence of sulfonylurea receptors is demonstrated in beta-cells but not in alpha-cells by using binding of glybenclamide-4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) combined with immunostaining for insulin and glucagon.

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Authors
Quesada, I., Nadal, A., & Soria, B.
Affiliations
  • Universitat de Miguel Hernández d'Elx (ES)
  • Institute of Bioengineering and Department of Physiology, Miguel Hernández University, San Juan, Alicante, Spain.
Venue
Diabetes
Published
1999-12-01
Volume
48
Issue
12
Pages
2390-2397
ISSN
  • 0012-1797 (ISSN-L)
  • 1939-327X
OpenAlex
W2106272975
Cited by
99
References
0
Citations by year
2026: 1 · 2025: 3 · 2024: 1 · 2023: 2 · 2022: 1 · 2021: 3 · 2020: 2 · 2019: 1 · 2018: 2 · 2016: 2 · 2015: 4 · 2014: 5 · 2013: 3 · 2012: 3
FWCI
4.21
Type
journal article
Language
en
Open access
closed
Locations
  • Diabetes (publishedVersion)
  • PubMed (publishedVersion)
  • DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion)
Topics
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
Keywords
tolbutamide, diazoxide, pancreatic islets, alpha cells, pancreatic beta cells, delta cells, intracellular calcium, calcium oscillations, sulfonylurea receptor, sulfonylureas, sulfonamides, ATP-sensitive potassium channels, insulin secretion, glucagon, type 2 diabetes, glibenclamide
MeSH terms
Animals, Boron Compounds, Calcium, Diazoxide, Fluorescent Dyes, Glyburide, Glucose, Islets of Langerhans, Kinetics, Mice, Inbred Strains, Receptors, Drug, Tolbutamide, Potassium Channels, Signal Transduction, Mice, In Vitro Techniques

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