Abstract
Objective
Our previous study demonstrated that polysaccharides of Dendrobium officinale Kimura et Migo (DP) were capable of enhancing immunomodulation in an experimental model of Sjögren’s syndrome, a chronic autoimmune disease mainly affecting the salivary glands. In the present study, we further investigated the protective effect of DP on a human salivary gland cell line A-253 against tumor necrosis factor (TNF)-α-induced apoptosis.
Materials
TNF-α (100 U/ml) was used as the stimulus for treating the A-253 cells to induce cellular apoptosis. Nuclear factor-kappa B (NF-κB, p65), phosphorylation of mitogen-activated protein kinases (MAPK), reactive oxygen species (ROS) generation, mitochondrial membrane potential and proapoptotic proteins were examined. A-253 cells were pre-treated with DP for 12 h before TNF-α stimulation.
Results
We observed translocation of NF-κB into the nuclei, prolonged MAPK, excessive ROS generation and strongly decreased mitochondrial membrane potential, and subsequently cytochrome C release and caspase-3 activation. However, pre-treatment with DP significantly inhibited the TNF-α-induced apoptotic factors.
Conclusions
Our data suggested the inhibitory effect of DP on TNF-α-induced apoptosis in a human salivary gland cell line. This inhibition indicated potential inference of DP in the initial plasma membrane-bound complex of TNF-α and its receptors.
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Acknowledgments
This work was supported by grants (Project No. 20730472 and Project No. 201011159206) from the University of Hong Kong.
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Xiang, L., Stephen Sze, C.W., Ng, T.B. et al. Polysaccharides of Dendrobium officinale inhibit TNF-α-induced apoptosis in A-253 cell line. Inflamm. Res. 62, 313–324 (2013). https://doi.org/10.1007/s00011-012-0584-x
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DOI: https://doi.org/10.1007/s00011-012-0584-x