Multiparameter Screening Reveals a Role for Na+ Channels in Cytokine-Induced β-Cell Death
| Autor: | James D. Johnson, Michel Roberge, Yu Hsuan Carol Yang, Yury Y. Vilin, Harley T. Kurata |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Male
Programmed cell death medicine.medical_treatment Apoptosis Mice Transgenic Voltage-Gated Sodium Channels Biology Pharmacology Endoplasmic Reticulum Cell Line Membrane Potentials Chemical library Mice chemistry.chemical_compound Endocrinology Insulin-Secreting Cells Insulin Secretion medicine Animals Insulin Cytotoxic T cell Calcium Signaling Molecular Biology Original Research Voltage-Gated Sodium Channel Blockers General Medicine Endoplasmic Reticulum Stress Small molecule High-Throughput Screening Assays Mitochondria Mice Inbred C57BL Antiapoptotic Agent Carbamazepine Cytokine chemistry Cytokines Calcium Female Signal transduction |
| Zdroj: | Molecular Endocrinology. 28:406-417 |
| ISSN: | 1944-9917 0888-8809 |
| Popis: | Pancreatic β-cell death plays a role in both type 1 and type 2 diabetes, but clinical treatments that specifically target β-cell survival have not yet been developed. We have recently developed live-cell imaging-based, high-throughput screening methods capable of identifying factors that modulate pancreatic β-cell death, with the hope of finding drugs that can intervene in this process. In the present study, we used a high-content screen and the Prestwick Chemical Library of small molecules to identify drugs that block cell death resulting from exposure to a cocktail of cytotoxic cytokines (25 ng/mL TNF-α, 10 ng/mL IL-1β, and 10 ng/mL IFN-γ). Data analysis with self-organizing maps revealed that 19 drugs had profiles similar to that of the no cytokine condition, indicating protection. Carbamazepine, an antiepileptic Na(+) channel inhibitor, was particularly interesting because Na(+) channels are not generally considered targets for antiapoptotic therapy in diabetes and because the function of these channels in β-cells has not been well studied. We analyzed the expression and characteristics of Na(+) currents in mature β-cells from MIP-GFP mice. We confirmed the dose-dependent protective effects of carbamazepine and another use-dependent Na(+) channel blocker in cytokine-treated mouse islet cells. Carbamazepine down-regulated the proapoptotic and endoplasmic reticulum stress signaling induced by cytokines. Together, these studies point to Na(+) channels as a novel therapeutic target in diabetes. |
| Databáze: | OpenAIRE |
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