@article{APS4879,
author = {Qun Zhu and Jun-fei Jin and Xiao-hong Shan and Cui-ping Liu and Xiao-dong Mao and Kuan-feng Xu and Chao Liu},
title = {Chronic activation of neutral ceramidase protects β-cells against cytokine-induced apoptosis},
journal = {Acta Pharmacologica Sinica},
volume = {29},
number = {5},
year = {2016},
keywords = {},
abstract = {Aim: To investigate the activity and expression of neutral ceramidase (N-CDase) in the insulin-secreting cell line INS-1 and its role in the cellular response to cytokines.
Methods: HPLC, Western blotting, and quantitative real-time PCR were performed to detect the activity and expression of N-CDase in INS-1 cells treated with a cytokine mixture (5 ng/mL interleukin-1β, 10 ng/mL TNF-α, and 50 ng/mL interferon-γ). The expression and activity of N-CDase in the INS-1 cells were specifically inhibited using N-CDase-siRNA transfection. Annexin V-fluorescein-isothiocyanate/propidium iodide flow cytometry was used to assess apoptosis in the INS-1 cells.
Results: The INS-1 cells exhibited some basal N-CDase activity, and cytokines induced a time-dependent delay in the activation of N-CDase. As a result, the activation of N-CDase was first detectable at 8 h after stimulation. It peaked at 16 h and remained elevated at 24 h. Cytokines also upregulated the mRNA and protein expression of N-CDase in the INS-1 cells. Furthermore, when N-CDase activity was inhibited by RNA interference, cytokine-induced apoptosis in the INS-1 cells was markedly increased.
Conclusion: The N-CDase pathway is active in INS-1 cells, and the chronic activation of N-CDase is involved in the pathological response of β-cells to cytokines, potentially providing protection against cytokine toxicity.},
issn = {1745-7254}, url = {http://www.chinaphar.com/article/view/4879}
}