Abstract
Deletion and missense or nonsense mutation of RAB39B gene cause familial Parkinson’s disease (PD). We hypothesized that deletion and mutation of RAB39B gene induce degeneration of dopaminergic neurons by decreasing protein level of functional RAB39B and causing RAB39B deficiency. Cellular model of deletion or mutation of RAB39B gene-induced PD was prepared by knocking down endogenous RAB39B in human SH-SY5Y dopaminergic cells. Transfection of shRNA-induced 90% reduction in RAB39B level significantly decreased viability of SH-SY5Y dopaminergic neurons. Deficiency of RAB39B caused impairment of macroautophagy/autophagy, which led to increased protein levels of α-synuclein and phospho-α-synucleinSer129 within endoplasmic reticulum (ER) and mitochondria. RAB39B deficiency-induced increase of ER α-synuclein and phospho-α-synucleinSer129 caused activation of ER stress, unfolded protein response, and ER stress-induced pro-apoptotic cascade. Deficiency of RAB39B-induced increase of mitochondrial α-synuclein decreased mitochondrial membrane potential and increased mitochondrial superoxide. RAB39B deficiency-induced activation of ER stress pro-apoptotic pathway, mitochondrial dysfunction, and oxidative stress caused apoptotic death of SH-SY5Y dopaminergic cells by activating mitochondrial apoptotic cascade. In contrast to neuroprotective effect of wild-type RAB39B, PD mutant (T168K), (W186X), or (G192R) RAB39B did not prevent tunicamycin- or rotenone-induced increase of neurotoxic α-synuclein and activation of pro-apoptotic pathway. Our results suggest that RAB39B is required for survival and macroautophagy function of dopaminergic neurons and that deletion or PD mutation of RAB39B gene-induced RAB39B deficiency induces apoptotic death of dopaminergic neurons via impairing autophagy function and upregulating α-synuclein.
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Funding
This work was supported by Chang Gung Medical Foundation (CMRPD1H0282, CMRPD1H0283, and CMRPD1M0141 to HL Wang; CMRPG3K0952, CMRPG3J0763, and CMRPD1M0291 to CC Chiu), the Ministry of Science and Technology, Taiwan (MOST 110–2320-B-182–003-MY3 to HL Wang; MOST109-2314-B-182–081-MY3 and MOST111-2326-B-182–001-MY3 to CC Chiu), and Healthy Aging Research Center, Chang Gung University (EMRPD1M0451 to HL Wang and UMRPD1M0341 to CC Chiu).
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Ching-Chi Chiu, Yi-Hsin Weng, Tu-Hsueh Yeh, and Hung-Li Wang conceptualized the study and designed the experiments; Ching-Chi Chiu, Yi-Hsin Weng, Juu-Chin Lu, Wan-Shia Chen, Allen Han-Ren Li, and Ying-Ling Chen performed the experiments and analyzed the data; Ching-Chi Chiu, Yi-Hsin Weng, Kuo-Chen Wei, and Hung-Li Wang wrote the manuscript.
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Chiu, CC., Weng, YH., Yeh, TH. et al. Deficiency of RAB39B Activates ER Stress-Induced Pro-apoptotic Pathway and Causes Mitochondrial Dysfunction and Oxidative Stress in Dopaminergic Neurons by Impairing Autophagy and Upregulating α-Synuclein. Mol Neurobiol 60, 2706–2728 (2023). https://doi.org/10.1007/s12035-023-03238-6
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DOI: https://doi.org/10.1007/s12035-023-03238-6