Efficient delivery of siRNA into cytokine-stimulated insulinoma cells silences Fas expression and inhibits Fas-mediated apoptosis

Fas/FasL interactions have been proposed as a potentially important mechanism mediating β-cell death in type 1 diabetes. Recent investigations suggest RNA interference, afforded by small interfering RNAs (siRNA), can provide specific and robust gene silencing in mammalian cells. The current study at...

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Bibliographic Details
Published in:FEBS letters 2006-01, Vol.580 (2), p.553-560
Main Authors: Burkhardt, Brant R., Lyle, Rachel, Qian, Keping, Arnold, Anne-Sophie, Cheng, Henrique, Atkinson, Mark A., Zhang, Y. Clare
Format: Article
Language:English
Subjects:
Animals
Apoptosis
Apoptosis - physiology
Caspase 3
Caspases - metabolism
Cell Line, Tumor
Cytokines
Cytokines - metabolism
Fas
fas Receptor - genetics
fas Receptor - metabolism
Gene Silencing
Humans
In Situ Nick-End Labeling
Insulin-Secreting Cells - immunology
Insulin-Secreting Cells - physiology
Insulinoma - metabolism
Mice
nitric oxide
NOD
non-obese diabetic
reverse transcription-polymerase chain reaction
RNA, Small Interfering - metabolism
RT-PCR
siRNA
Small interfering RNA
terminal deoxynucleotidyl transferase biotin-dUTP nick end labeling
TUNEL
Type 1 diabetes
β cells
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Summary:Fas/FasL interactions have been proposed as a potentially important mechanism mediating β-cell death in type 1 diabetes. Recent investigations suggest RNA interference, afforded by small interfering RNAs (siRNA), can provide specific and robust gene silencing in mammalian cells. The current study attempted to investigate the effects of silencing Fas expression with siRNA on Fas-mediated apoptosis in mouse insulinoma cells following cytokine incubation. Our results indicate that siRNA is capable of rapid inhibition of cytokine-induced Fas mRNA production and cell surface Fas protein. A complete suppression of the total Fas protein was only observed after prolonged incubation with siRNA, suggesting a slow turn-over of Fas protein. Moreover, siRNA significantly inhibited Fas-mediated β-cell apoptosis assessed by Caspase-3 and terminal deoxynucleotidyl transferase biotin-dUTP nick end labeling assays, the extent of which positively correlated with the level of cell surface Fas. These observations provide additional evidence supporting a role for the Fas-mediated pathway in β-cell destruction, and suggest that siRNA targeting Fas may be of therapeutic value in preventing type 1 diabetes and improving islet cell viability in transplantation.
ISSN:0014-5793
1873-3468
DOI:10.1016/j.febslet.2005.12.068