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Interleukin-1 and beta-cell function: more than one second messenger?
J M Argilés1, J López-Soriano, M A Ortiz
1Departament de Bioquímica i Fisiologia, Universitat de Barcelona, Spain.
Endocrine Reviews
|August 1, 1992
Summary
Interleukin-1 (IL-1) from macrophages can destroy pancreatic beta-cells in type 1 diabetes. IL-1 triggers cell death and inhibits insulin production through multiple signaling pathways.
Area of Science:
- Immunology
- Endocrinology
- Cell Biology
Background:
- Cytokines, particularly Interleukin-1 (IL-1), are implicated in immune-mediated beta-cell destruction in Type 1 Diabetes Mellitus (IDDM).
- IL-1 plays a significant role in suppressing insulin release and biosynthesis in pancreatic islets.
Purpose of the Study:
- To investigate the mechanisms by which IL-1 induces beta-cell destruction and dysfunction.
- To elucidate the signal transduction pathways activated by IL-1 in pancreatic beta-cells.
Main Methods:
- Cultured rat pancreatic islets were used to study the effects of IL-1.
- Analysis of cytotoxic effects, including the role of oxygen free radicals, nitric oxide (NO) formation, and sodium influx.
- Investigation of signaling pathways such as cAMP, phospholipase C, cytosolic Ca++, and protease activation.
Main Results:
- IL-1 exhibits cytotoxic effects on beta-cells, leading to cell death.
- Mechanisms of cytotoxicity involve oxygen free radicals, NO formation, and Na+ influx-induced cell swelling.
- IL-1 inhibits insulin release and biosynthesis via multiple second messenger systems, including cAMP, Ca++, and protease activation.
Conclusions:
- IL-1-induced beta-cell destruction and dysfunction in IDDM are mediated by complex, multifactorial signaling pathways.
- The action of IL-1 on pancreatic beta-cells is not dependent on a single second messenger system but involves a plurifactorial transduction system.