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- W3009331350 abstract "Presenilin-associated protein (PSAP) was originally identified as a mitochondrial proapoptotic protein. To further explore the apoptotic pathway that involves PSAP, our yeast two-hybrid screen revealed that PSAP interacts with a death receptor, DR6. DR6 is a relatively less common member of the dea th receptor family and has been shown to mediate the neurotoxicity of amyloid-β, mutant SOD1, and prion proteins and has also been implicated in the regulation of immune cell proliferation and differentiation. Our previous study showed that DR6 induces apoptosis via a unique mitochondria-dependent pathway different from the conventional death receptor-mediated extrinsic apoptotic pathways. Thus, the interaction of DR6 with PSAP established a direct molecular link between DR6 and mitochondrial apoptotic pathway. We investigated the possible role of PSAP in DR6-induced apoptosis. Interestingly, it was discovered that knockdown of PSAP strongly inhibited DR6-induced apoptosis. To further elucidate the mechanism by which PSAP mediates DR6-induced mitochondria-dependent apoptosis, our data demonstrated that knockdown of PSAP blocked DR6-induced Bax translocation and cytochrome c release from the mitochondria. Moreover, it was found that both PSAP and DR6 form complexes with Bax, but at different subcellular locations. The DR6-Bax complex was detected in the cytosolic fraction while the PSAP-Bax complex was detected in the mitochondrial fraction. The observation that knockdown of DR6 significantly reduced the amount of PSAP-Bax complex detected in mitochondria suggests a possibility that DR6-bound Bax is transferred to PSAP upon interaction with PSAP at the mitochondria, leading to cytochrome c release and eventually apoptosis." @default.
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- W3009331350 date "2020-04-21" @default.
- W3009331350 modified "2023-10-18" @default.
- W3009331350 title "Proapoptotic Mitochondrial Carrier Homolog Protein PSAP Mediates Death Receptor 6 Induced Apoptosis" @default.
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- W3009331350 doi "https://doi.org/10.3233/jad-191086" @default.
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