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Sulfonylurea action re-revisited.
Susumu Seino1, Chang-Liang Zhang2, Tadao Shibasaki3
1Division of Cellular and Molecular Medicine, Department of Physiology and Cell Biology ; Division of Diabetes, Metabolism and Endocrinology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe ; Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency, Saitama.
Journal of Diabetes Investigation
|May 21, 2014
Summary
Sulfonylureas stimulate insulin secretion in type 2 diabetes by affecting KATP channels and Epac2/Rap1 signaling. Different sulfonylureas have varied effects, leading to diverse actions in the pancreas and beyond.
Area of Science:
- Endocrinology
- Pharmacology
- Molecular Biology
Background:
- Sulfonylureas (SU) are widely prescribed for type 2 diabetes mellitus (T2DM).
- Their primary mechanism involves stimulating insulin secretion via inhibition of ATP-sensitive K(+) (KATP) channels in pancreatic beta-cells.
- Emerging evidence suggests SU also modulate other signaling pathways.
Purpose of the Study:
- To elucidate the role of Epac2/Rap1 signaling in SU-mediated insulin secretion.
- To investigate the differential effects of various SU on Epac2/Rap1 activation.
- To understand how these molecular actions contribute to the diverse effects of SU.
Main Methods:
- Investigated the activation of Epac2 (cAMP sensor) and downstream Rap1 signaling by SU.
- Examined the impact of SU on KATP channels in pancreatic beta-cells.
- Compared the effects of different SU compounds on these pathways.
Main Results:
- SU activate the Epac2-Rap1 signaling cascade, which also promotes insulin secretion.
- The extent of Epac2/Rap1 activation varies among different SU.
- SU exhibit diverse effects on KATP channels across different tissues.
Conclusions:
- Both KATP channel inhibition and Epac2/Rap1 activation contribute to SU-induced insulin secretion.
- Variations in Epac2/Rap1 signaling and KATP channel interactions explain the distinct pancreatic and extra-pancreatic effects of different SU.
- This highlights the complex pharmacology of SU in T2DM management.