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Cellular prion protein is present in mitochondria of healthy mice. Sci Rep 2017; 7:41556. [PMID: 28148964 PMCID: PMC5288712 DOI: 10.1038/srep41556] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Accepted: 12/13/2016] [Indexed: 01/04/2023] Open
Abstract
Cellular prion protein (PrPC) is a mammalian glycoprotein which is usually found anchored to the plasma membrane via a glycophosphatidylinositol (GPI) anchor. PrPC misfolds to a pathogenic isoform PrPSc, the causative agent of neurodegenerative prion diseases. The precise function of PrPC remains elusive but may depend upon its cellular localization. Here we show that PrPC is present in brain mitochondria from 6–12 week old wild-type and transgenic mice in the absence of disease. Mitochondrial PrPC was fully processed with mature N-linked glycans and did not require the GPI anchor for localization. Protease treatment of purified mitochondria suggested that mitochondrial PrPC exists as a transmembrane isoform with the C-terminus facing the mitochondrial matrix and the N-terminus facing the intermembrane space. Taken together, our data suggest that PrPC can be found in mitochondria in the absence of disease, old age, mutation, or overexpression and that PrPC may affect mitochondrial function.
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Yang XD, Shi Q, Sun J, Lv Y, Ma Y, Chen C, Xiao K, Zhou W, Dong XP. Aberrant Alterations of Mitochondrial Factors Drp1 and Opa1 in the Brains of Scrapie Experiment Rodents. J Mol Neurosci 2016; 61:368-378. [PMID: 27921253 DOI: 10.1007/s12031-016-0866-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Accepted: 11/21/2016] [Indexed: 12/25/2022]
Abstract
The abnormal mitochondrial dynamics has been reported in the brains of some neurodegenerative diseases, such as Alzheimer's disease (AD) and Parkinson's disease (PD), but limitedly described in prion disease. Dynamin-related protein 1 (Drpl) and optic atrophy protein 1 (Opa1) are two essential elements for mitochondria fission and fusion. To evaluate possible changes of mitochondria dynamics during prion infection, the situations of brain Drp1 and Opa1 of scrapie strains 139A, ME7, and S15 mice, as well as 263K-infected hamsters, were analyzed. Significant decreases of brain Drp1 were observed in scrapie-infected rodents at terminal stage by Western blots and immunohistochemical assays, while the levels of Opa1 also showed declined tendency in the brains of scrapie-infected rodents. Immunofluorescent assays illustrated well localization of Drp1 or Opa1 within NeuN-positive cells. Moreover, the S-nitrosylated forms of Drp1significantly increased in the brain tissues of 139A- and ME7-infected mice at terminal stage. Dynamic analysis of Drp1 and SNO-Dpr1 in the brains collected at different time points within the incubation period of 139A-infected mice demonstrated that the whole Drp1 decreased at all tested samples, whereas the SNO-Drp1 remarkably increased in the sample of 90-day post-infection (dpi), reached to the peak in that of 120 dpi and dropped down but still maintained at higher level at the end of disease. The levels of apoptotic factors cleaved caspase 9, caspase 3, and Bax were also markedly increased in the brain tissues of the mice infected with agents 139A and ME7. Our data indicate a disorder of mitochondria dynamics in the brains of prion infection, largely depending on the abnormal alteration of brain Drp1.
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Affiliation(s)
- Xiao -Dong Yang
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center Diagnosis and Treatment of Infectious Diseases, Zhejiang University, Hangzhou, China.,Chinese Center for Disease Control and Prevention, National Institute for Viral Disease Control and Prevention, Chang-Bai Rd 155, Beijing, 102206, China
| | - Qi Shi
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center Diagnosis and Treatment of Infectious Diseases, Zhejiang University, Hangzhou, China. .,Chinese Center for Disease Control and Prevention, National Institute for Viral Disease Control and Prevention, Chang-Bai Rd 155, Beijing, 102206, China.
| | - Jing Sun
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center Diagnosis and Treatment of Infectious Diseases, Zhejiang University, Hangzhou, China.,Chinese Center for Disease Control and Prevention, National Institute for Viral Disease Control and Prevention, Chang-Bai Rd 155, Beijing, 102206, China
| | - Yan Lv
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center Diagnosis and Treatment of Infectious Diseases, Zhejiang University, Hangzhou, China.,Chinese Center for Disease Control and Prevention, National Institute for Viral Disease Control and Prevention, Chang-Bai Rd 155, Beijing, 102206, China
| | - Yue Ma
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center Diagnosis and Treatment of Infectious Diseases, Zhejiang University, Hangzhou, China.,Chinese Center for Disease Control and Prevention, National Institute for Viral Disease Control and Prevention, Chang-Bai Rd 155, Beijing, 102206, China
| | - Cao Chen
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center Diagnosis and Treatment of Infectious Diseases, Zhejiang University, Hangzhou, China.,Chinese Center for Disease Control and Prevention, National Institute for Viral Disease Control and Prevention, Chang-Bai Rd 155, Beijing, 102206, China
| | - Kang Xiao
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center Diagnosis and Treatment of Infectious Diseases, Zhejiang University, Hangzhou, China.,Chinese Center for Disease Control and Prevention, National Institute for Viral Disease Control and Prevention, Chang-Bai Rd 155, Beijing, 102206, China
| | - Wei Zhou
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center Diagnosis and Treatment of Infectious Diseases, Zhejiang University, Hangzhou, China.,Chinese Center for Disease Control and Prevention, National Institute for Viral Disease Control and Prevention, Chang-Bai Rd 155, Beijing, 102206, China
| | - Xiao-Ping Dong
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center Diagnosis and Treatment of Infectious Diseases, Zhejiang University, Hangzhou, China. .,Chinese Center for Disease Control and Prevention, National Institute for Viral Disease Control and Prevention, Chang-Bai Rd 155, Beijing, 102206, China. .,Chinese Academy of Sciences Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China.
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