Caffeine activates the PI3K/Akt pathway and prevents apoptotic cell death in a Parkinson's disease model of SH-SY5Y cells

Neuroscience Letters
Kazuhiro NakasoKenji Nakashima

Abstract

Parkinson's disease (PD) is one of the most common neurodegenerative diseases. Recent epidemiological studies suggest that caffeine, one of the major components of coffee, has a protective effect against developing PD. However, the detailed mechanisms of how caffeine suppresses neuronal death have not been fully elucidated. We investigated the cytoprotective mechanisms of caffeine using human dopaminergic neuroblastoma SH-SY5Y cells as a PD model. Caffeine prevented the apoptotic cell death induced by serum/retinoic acid (RA) deprivation, MPP+, rotenone, and 6-OHDA in SH-SY5Y cells in a dose dependent manner. Caffeine lowered caspase-3 activity induced by serum/RA deprivation and 6-OHDA administration, and also decreased the number of apoptotic condensed and/or fragmented nuclei. Akt was phosphorylated 60 min after caffeine administration in a dose dependent manner; PI3K inhibitors, wortmannin and LY294002 canceled this cytoprotective effect of caffeine. On the other hand, MAPKs such as Erk1/2, p38, or JNK were not activated by caffeine. These results suggest that caffeine has a cytoprotective effect due to the activation of the PI3K/Akt pathways in SH-SY5Y cells.

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