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Suppressor of cytokine signaling-1 inhibits caspase activation and protects from cytokine-induced beta cell death

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Abstract

Pancreatic beta cell damage caused by pro-inflammatory cytokines interleukin-1β (IL-1β), interferon-γ (IFNγ) and tumor necrosis factor-α (TNFα) is a key event in the pathogenesis of type 1 diabetes. The suppressor of cytokine signaling-1 (SOCS-1) blocks IFNγ-induced signaling and prevents diabetes in the non-obese diabetic mouse. Here, we investigated if SOCS-1 overexpression in primary beta cells provides protection from cytokine-induced islet cell dysfunction and death. We demonstrate that SOCS-1 does not prevent increase in NO production and decrease in glucose-stimulated insulin secretion in the presence of IL-1β, IFNγ, TNFα. However, it decreases the activation of caspase-3, -8 and -9, and thereby, promotes a robust protection from cytokine-induced beta cell death. Our data suggest that SOCS-1 overexpression may not be sufficient in preventing all the biological activities of IFNγ in beta cells. In summary, we show that interference with IFNγ signal transduction pathways by SOCS-1 inhibits cytokine-stimulated pancreatic beta cell death.

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Acknowledgments

This work was supported by Grant N5-2001-34 from the Juvenile Diabetes Foundation International, the Swedish Foundation for Strategic Research, the European Foundation for the Study of Diabetes, the Swedish Research Council, the Swedish Diabetes Association, funds from Karolinska Institutet, the Novo Nordisk Foundation, The Family Erling-Persson Foundation, Berth von Kantzow’s Foundation, and Novo Nordisk A/S. Stella Jacobson is greatly acknowledged for assistance with the genotyping of the mice.

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Correspondence to Sergei V. Zaitsev.

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Zaitseva, I.I., Hultcrantz, M., Sharoyko, V. et al. Suppressor of cytokine signaling-1 inhibits caspase activation and protects from cytokine-induced beta cell death. Cell. Mol. Life Sci. 66, 3787–3795 (2009). https://doi.org/10.1007/s00018-009-0151-y

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