Abstract：
:DJ-1 was identified as an oncogene and also as a causative gene for a familial form of Parkinson disease (PD). DJ-1 plays various roles in anti-oxidative stress response. Superfluous oxidation of DJ-1 at cysteine residue 106 (C106), an inactive form of DJ-1, was observed in PD patients. DJ-1-binding compound B, which specifically bound to the C106 region of DJ-1, has been isolated and it has been shown to prevent oxidative stress-induced cell death through maintaining active forms of DJ-1 by inhibiting its superfluous oxidation. The molecular mechanism of the action of compound B, however, has not been fully elucidated. In this study, we found that compound B stimulated transcriptional activity of Nrf2 in H2O2-treated SH-SY5Y cells by inhibiting its degradation through the ubiquitin-proteasome system. Although Keap 1 is a major negative regulator of Nrf2, compound B strongly increased Nrf2 activity in Keap1-mutant A549 cells but not in PTEN-null PC3 and PTEN-knockout SH-SY5Y cells. Furthermore, treatment of cells with inhibitors of the PI3-kinase/Akt pathway inhibited the effect of compound B, and compound B increased the binding of PTEN to DJ-1 and decreased lipid phosphatase activity of PTEN concomitantly with increased oxidation of PTEN, an inactive form of PTEN. These results suggest that compound B enhances transcriptional activity of Nrf2 under an oxidative stress condition in a Keap1-independent manner and that its activity is elicited by activation of the PI3Kinase/Akt pathway with DJ-1-dependent inactivation of PTEN, leading to protection of oxidative stress-induced cell death.
journal_name
Brain Resjournal_title
Brain researchauthors
Niki T,Endo J,Takahashi-Niki K,Yasuda T,Okamoto A,Saito Y,Ariga H,Iguchi-Ariga SMMdoi
10.1016/j.brainres.2019.146641subject
Has Abstractpub_date
2020-02-15 00:00:00pages
146641eissn
0006-8993issn
1872-6240pii
S0006-8993(19)30695-Xjournal_volume
1729pub_type
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