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Pretreatment-Etidronate Alleviates CoCl 2 Induced-SH-SY5Y Cell Apoptosis via Decreased HIF-1α and TRPC5 Channel Proteins.
Neurochemical Research 2018 December 12
Chronic hypoxic damage is one of the most common pathogenic factors that can cause neurodegenerative disorder in most cases. Etidronate (Eti) is one of the best-known earlier-generations of bisphosphonate derivatives for the treatment of bone-loss related diseases. Building on the preceding study of our laboratory, we found that Eti showed neuroprotective effects against 2-vessel occlusion induced vascular dementia (VD) in rats. Therefore, in this study, we attempted to elucidate the mechanism of action, which Eti protected cells from chronic hypoxic damage caused by CoCl2 in SH-SY5Y cells in vitro. Our data showed that the pretreatment with 100 µM Eti partially improved hypoxic damage in cell viability and reduced the hypoxia-inducible factor-1α (HIF-1α) expression, which indicated chronic hypoxic level. Furthermore, the protein expression of TRPC5 channel and its mediated intracellular calcium ion concentration ([Ca2+ ]i ) were decreased. In addition, the apoptosis-related proteins caspase-9, and caspase-3 as well as calcium/calmodulin-dependent protein kinase II (CaMK-II) were down-regulated after treatment with Eti. In conclusion, Eti shows neuroprotective effects on SH-SY5Y cells injured by CoCl2 through resisting apoptosis caused by calcium influx, which may be related to the inhibition of HIF-1α protein and the decreased TRPC5 channel protein.
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