1-methyl-4-phenylpyridiniumion(MPP+)inducesendoplasmicreticulumstressandactivatescaspase-12inPC12cells,leadingtoneuronalapoptosis.However,theunderlyingmolecularmechanismremainsunknown.Thepresentstudyinvestigatedtheregulatoryeffectsofnervegrowthfactor(Aktactivator)andlithiumchloride(glycogensynthasekinase-3βinhibitor)ontheendoplasmicreticulumstresssignalingpathway.TheresultsrevealedthatMPP+inducedexpressionofBipandC/EBPhomologousprotein.TheupregulationofBipandC/EBPhomologousprotein,aswellasthedecreasedpro-caspase-12levelinducedbyMPP+wereinhibitedbypretreatmentofthenervegrowthfactororlithiumchloride.Theseresultssuggestthatthephosphatidylinositol3kinase-Akt-glycogensynthasekinase-3βpathwayisinvolvedinMPP+-inducedendoplasmicreticulumstress.
