Abstract
Alzheimer’s disease (AD) is a progressive neurodegenerative disorder that is thought to be caused in part by the age-related accumulation of amyloid-β (Aβ) in the brain. Recent findings have revealed that nitric oxide (NO) modulates the processing of amyloid-β precursor protein (APP) and alters Aβ production; however, the previously presented data are contradictory and the underlying molecular mechanisms are still incomplete. Here, using human SH-SY5Y neuroblastoma cells stably transfected with wild-type APPwt695, we found that NO, derived from NO donor sodium nitroprusside (SNP), bi-directionally modulates APP processing in vitro. The data from ELISA and Western blot (WB) tests indicated that SNP at lower concentrations (0.01 and 0.1 μM) inhibits BACE1 expression, thus consequently suppresses APP β-cleavage and decreases Aβ production. In contrast, SNP at higher concentrations (10 and 20 μM) biases the APP processing toward the amyloidogenic pathway as evidenced by an increased BACE1 but a decreased ADAM10 expression, together with an elevated Aβ secretion. This bi-directional modulating activity of SNP on APP processing was completely blocked by specific NO scavenger c-PTIO, indicating NO-dependent mechanisms. Moreover, the anti-amyloidogenic activity of SNP is sGC/cGMP/PKG-dependent as evidenced by its reversal by sGC/PKG inhibitions, whereas the amyloidogenic activity of SNP is peroxynitrite-related and can be reversed by peroxynitrite scavenger uric acid. In summary, these present findings predict a double-edged role of NO in APP processing in vitro. Low (physiological) levels of NO inhibit the amyloidogenic processing of APP, whereas extra-high (pathological) concentrations of NO favor the amyloidogenic pathway of APP processing. This preliminary study may provide further evidence to clarify the molecular roles of NO and NO-related signaling in AD and supply potential molecular targets for AD treatment.
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Acknowledgments
This work was supported by the National Basic Research Program of China (2013CB531703), the National Natural Science Foundation of China (NSFC 81370470, 81202448, 11204023, and 81273919), the Humanity and Social Science Research Funds of Ministry of Education (13YJCZH087), the Scientific Research Fund of Liaoning Provincial Education Department (L2015145), and the Science and Technology Project of Liaoning Province (2012225020).
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None of the authors have actual or potential conflicts of interest. None of the authors’ institution has contracts relating to this research. The authors indicated that they and their institutions have no other agreements that could be seen as involving a financial interest in this work.
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Zheng-Xu Cai, Hui-Shu Guo, and Che Wang contributed equally to this work.
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12640_2015_9564_MOESM1_ESM.pptx
Supplement Fig. 1. Various concentrations of SNP on cells proliferation as determined by MTT assay. SNP at higher concentrations (50 to 200 μM) induced a significant cytotoxicity, whereas SNP at lower concentrations (0.01 and 0.1 μM) have the tendency to promote cells proliferation (a); the IC50 value was calculated on the basis of MTT assay using GraphPad Prism (b). Supplementary material 1 (PPTX 56 kb)
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Cai, ZX., Guo, HS., Wang, C. et al. Double-Edged Roles of Nitric Oxide Signaling on APP Processing and Amyloid-β Production In Vitro: Preliminary Evidence from Sodium Nitroprusside. Neurotox Res 29, 21–34 (2016). https://doi.org/10.1007/s12640-015-9564-6
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DOI: https://doi.org/10.1007/s12640-015-9564-6