The imidazoline compound RX871024 reduces IL-1β-induced NO production thereby protecting against IL-1β-induced β-cell apoptosis. The aim of this study was to evaluate whether imidazolines RX871024 and efaroxan protect β-cells against death in the presence of a combination of the cytokines IL-1β, IFNγ, and TNFα. To address this issue, experiments involving different methods for detection of cell death, different concentrations of the cytokines, and a variety of conditions of preparation and culturing of ob/ob mouse islets and β-cells have been carried out. Thoroughly performed experiments have not been able to demonstrate a protective effect of RX871024 and efaroxan on β-cell death induced by the combination of cytokines. However, the inhibitory effect of RX871024 on NO production in ob/ob mouse islets and β-cells was still observed in the presence of all three cytokines and correlated with the decrease in p38 MAPK phosphorylation. Conversely, efaroxan did not affect cytokine-induced NO production. Our data indicate that a combination of pro-inflammatory cytokines IL-1β, IFNγ, and TNFα, conditions modelling those that take place in type 1 diabetes, induces pancreatic β-cell death that does not directly correlate with NO production and cannot be counteracted with imidazoline compounds.
Original language | English |
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Pages (from-to) | 1121-1128 |
Number of pages | 8 |
Journal | Biochemical and Biophysical Research Communications |
Volume | 347 |
Issue number | 4 |
DOIs | |
State | Published - 8 Sep 2006 |
ID: 5533136