Hydrogen sulfide protects SH-SY5Y cells against 6-hydroxydopamine-induced endoplasmic reticulum stress

American Journal of Physiology. Cell Physiology
Li XieJin-Song Bian

Abstract

Endoplasmic reticulum (ER) stress has been implicated in several neurodegenerative diseases, including Parkinson's disease. The present study attempted to investigate the effect of hydrogen sulfide (H(2)S) on 6-hydroxydopamine (6-OHDA)-induced ER stress in SH-SY5Y cells. We found in the present study that exogenous application of sodium hydrosulfide (NaHS; an H(2)S donor, 100 μM) significantly attenuated 6-OHDA (50 μM)-induced cell death. NaHS also reversed the upregulation of cleaved poly(ADP-ribose) polymerase and caspase 9 in 6-OHDA-treated cells. Consistent with its cytoprotective effects, NaHS markedly reduced 6-OHDA induced-ER stress responses, including the upregulated levels of eukaryotic initiation factor-2α phosphorylation, glucose-regulated protein 78, and C/EBP homologous protein expression. The protective effect of H(2)S on ER stress was attenuated by blockade of Akt activity with an Akt inhibitor or inhibition of heat shock protein (Hsp)90 with geldanamycin but not by suppression of ERK1/2 with PD-98059. Blockade of Akt also significantly decreased the protein abundance of Hsp90 in SH-SY5Y cells. Moreover, overexpression of cystathionine β-synthase (a main H(2)S-synthesizing enzyme in the brain) elevated the Hsp90...Continue Reading

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