Tumor necrosis factor α-induced protein-3 protects zinc transporter 8 against proinflammatory cytokine-induced downregulation

Cheng,Liqing; Zhang,Dongmei; Chen,Bing

doi:10.3892/etm.2016.3457

September-2016 Volume 12 Issue 3

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September-2016 Volume 12 Issue 3

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Article

Tumor necrosis factor α-induced protein-3 protects zinc transporter 8 against proinflammatory cytokine-induced downregulation

Authors:
- Liqing Cheng
- Dongmei Zhang
- Bing Chen
View Affiliations / Copyright

Affiliations: Department of Endocrinology and Metabolism, Southwest Hospital, Third Military Medical University, Chongqing 400038, P.R. China, Department of Dermatology, Southwest Hospital, Third Military Medical University, Chongqing 400038, P.R. China
Pages: 1509-1514
|
Published online on: June 15, 2016

https://doi.org/10.3892/etm.2016.3457
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Abstract

Zinc transporter 8 (ZnT8) is exclusively expressed in the pancreatic islet and is essential for insulin crystallization, hexamerization and secretion. Tumor necrosis factor α‑induced protein‑3 (TNFAIP3) is a zinc finger protein that serves a major role in the negative feedback regulation of NF‑κB signaling in response to multiple stimuli, and is a central regulator of immunopathology. Although the role of TNFAIP3 in diabetes has been extensively studied, its effect on ZnT8 has not been fully elucidated. The present study aimed to verify whether proinflammatory cytokines, tumor necrosis factor α (TNF-α) and interleukin-1β (IL-1β), are able to affect ZnT8 expression in islet cells. In addition, the study aimed to determine the effect of TNFAIP3 overexpression on cytokine‑altered ZnT8 activity, considering its effect on NF‑κB signaling. Cell‑based studies using NIT‑1 cells overexpressing TNFAIP3 were used to assess the effect of cytokines on ZnT8 and NF‑κB activation, as well as the effect of TNFAIP3 on ZnT8 expression. Western blot analysis and immunofluorescence staining were employed to determine the protein expression and NF-κB activation, respectively. The results indicated that cytokine stimulation led to TNFAIP3 upregulation, ZnT8 downregulation and NF‑κB activation. Furthermore, TNFAIP3 overexpression protected ZnT8 from cytokine‑induced downregulation. In conclusion, the current results suggest that inflammation or TNFAIP3 dysfunction may be involved in the pathogenesis of diabetes via ZnT8 expression, besides from islet cell apoptosis. In addition, restricting inflammation and enhancing TNFAIP3 expression may exert a positive effect in diabetes prevention, treatment and pancreatic cell transplantation.

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