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Related Concept Videos

Oral Hypoglycemic Agents: Sulfonylureas01:17

Oral Hypoglycemic Agents: Sulfonylureas

Sulfonylureas are oral hypoglycemic agents utilized in treating type 2 diabetes. They are characterized by their unique sulfonylurea chemical structure. The family of sulfonylureas is divided into generations. First-generation sulfonylureas, including tolbutamide (Orinase), chlorpropamide (Diabinese), and tolazamide (Tolinase), trigger insulin release from pancreatic β cells and enhance peripheral tissues' insulin sensitivity. The second-generation members, such as glipizide (Glucotrol),...
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Some receptors remain unoccupied even when an agonist produces a maximal response. Such empty ones are called spare receptors. In presence of spare receptors the maximum effect of an agonist drug is achieved with fewer than 100% of the receptors being occupied. To determine the presence of spare receptors, scientists often compare the concentration of the drug needed to produce 50% of the maximum effect (EC50) with the concentration of the drug needed to occupy 50% of the receptors (Kd). If the...
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Repaglinide (Prandin) and Nateglinide (Starlix), known as glinides, are oral insulin secretagogues that stimulate insulin release from pancreatic β cells by closing the ATP-sensitive potassium channels (KATP channel). Repaglinide controls insulin release from pancreatic β cells by managing potassium efflux. It shares two binding sites with sulfonylureas and also has a unique site, indicating overlapping mechanisms of action. With a rapid onset and a 4-7 hour duration, it effectively manages...
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Epac2: a sulfonylurea receptor?

Holger Rehmann1

  • 1Department of Molecular Cancer Research, Centre for Biomedical Genetics and Cancer Genomics Centre, University Medical Center Utrecht, Universiteitsweg 100, 3584 CG Utrecht, The Netherlands. h.rehmann@umcutrecht.nl

Biochemical Society Transactions
|January 21, 2012
PubMed
Summary
This summary is machine-generated.

Sulfonylureas are common diabetes drugs that target ATP-sensitive K+ channels. This paper critically discusses and refutes the recent claim that sulfonylureas directly activate Epac2, a protein in pancreatic beta-cells.

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Area of Science:

  • Pharmacology
  • Endocrinology
  • Cell Biology

Background:

  • Sulfonylureas are oral medications for diabetes mellitus.
  • They primarily act by inhibiting ATP-sensitive K+ channels in pancreatic beta-cells.
  • Recent studies suggested Epac2 as an additional sulfonylurea target, sparking debate.

Purpose of the Study:

  • To critically evaluate the evidence for direct activation of Epac2 by sulfonylureas.
  • To clarify the molecular targets and mechanisms of sulfonylurea action in diabetes treatment.

Main Methods:

  • Literature review and critical analysis of existing studies on sulfonylurea-Epac2 interactions.
  • Discussion of the established mechanism of sulfonylurea action via ATP-sensitive K+ channels.

Main Results:

  • The paper concludes that sulfonylureas do not directly activate Epac2.
  • Evidence suggests sulfonylureas are unlikely to bind to Epac2.
  • The classical mechanism involving ATP-sensitive K+ channels remains the primary mode of action.

Conclusions:

  • The proposed role of Epac2 as a direct sulfonylurea target is not supported by current evidence.
  • Sulfonylureas' therapeutic effects in diabetes mellitus are predominantly mediated through ATP-sensitive K+ channels.
  • Further research should focus on validating established mechanisms rather than controversial targets.