Heat shock proteins (HSPs) play an essential role in various
neurodegenerative diseases. Manipulation of upregulation of HSPs in cells has been demonstrated to provide a therapeutic strategy to counteract the misfolding and aggregation of
proteins that resulted in
neurodegenerative disease. Our previous studies have shown that FLZ, a synthetic novel derivative of
squamosamide from a Chinese herb, had potent
neuroprotective effect against several experimental
Parkinson's disease (PD) models. However, the mechanism of its
neuroprotective effect is still not clarified. The present study demonstrated that FLZ induced HSP27 and HSP70
proteins and
mRNA expression in a time- and dose-dependent manner in SH-SY5Y cells. Further studies showed that FLZ treatment stimulated the activation of heat shock factor 1 (HSF1) and its regulatory
kinase Akt. Inactivation of Akt pathway by the PI3K inhibitor
LY294002 blocked the expression of HSP27 and HSP70 induced by FLZ. Moreover, the inducing effects of FLZ on HSP27, HSP70, and HSF1 were all blocked by
quercetin, an inhibitor of HSP biosynthesis. The cytoprotective effect of HSP27/HSP70 induced by FLZ against MPP(+) was assessed in SH-SY5Y cells. The pretreatment of FLZ significantly induced the accumulations of HSP27/HSP70 and suppressed the apoptosis caused by MPP(+) in SH-SY5Y cells. However, the protective effects of FLZ against MPP(+) were significantly blocked by
quercetin, which indicated that the cytoprotective action of FLZ against MPP(+)-induced apoptosis is at least partially mediated by its induction of HSP27/HSP70. These results provide new evidence for elucidating the mechanism of the
neuroprotective effect of FLZ against PD.