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Tumor necrosis factor-alpha-induced changes in insulin-producing beta-cells
Jai Parkash1, Muhammad A Chaudhry, William B Rhoten
1Joan C. Edwards School of Medicine, Department of Anatomy, Cell and Neurobiology, Marshall University, Huntington, West Virginia 25704, USA. parkash@marshall.edu
Summary
Tumor necrosis factor-alpha (TNF-alpha) promotes beta-cell apoptosis in diabetes by reducing calbindin-D(28k) expression and altering intracellular calcium levels. This finding is crucial for understanding diabetes pathogenesis.
Area of Science:
- Endocrinology
- Cell Biology
- Immunology
Background:
- Tumor necrosis factor-alpha (TNF-alpha) is implicated in both type 1 and type 2 diabetes pathogenesis.
- Elevated TNF-alpha contributes to beta-cell death and insulin resistance.
Purpose of the Study:
- To investigate the effects of TNF-alpha on insulin-producing RIN-1046-38 (RIN) beta-cells.
- To characterize TNF-alpha's impact on beta-cell apoptosis, replication, insulin release, and gene expression.
Main Methods:
- Treatment of RIN cells with TNF-alpha.
- Western blot and ELISA to quantify calbindin-D(28k) levels.
- Measurement of intracellular calcium concentration changes.
- TUNEL assay for apoptosis assessment.
- Cell replication assays.
- Microarray analysis for gene expression profiling.
Main Results:
- TNF-alpha significantly decreased calbindin-D(28k) expression in beta-cells.
- TNF-alpha treatment increased intracellular calcium levels and apoptosis rates.
- Cell replication decreased by 36% following TNF-alpha exposure.
- Microarray analysis revealed selective gene expression alterations.
Conclusions:
- TNF-alpha induces apoptosis in beta-cells, partly through reduced calbindin-D(28k) and altered intracellular calcium.
- These findings enhance understanding of TNF-alpha's role in diabetes mellitus pathogenesis.