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Banerjee R, Raj A, Potdar C, Kumar Pal P, Yadav R, Kamble N, Holla V, Datta I. Astrocytes Differentiated from LRRK2-I1371V Parkinson's-Disease-Induced Pluripotent Stem Cells Exhibit Similar Yield but Cell-Intrinsic Dysfunction in Glutamate Uptake and Metabolism, ATP Generation, and Nrf2-Mediated Glutathione Machinery. Cells 2023; 12:1592. [PMID: 37371062 DOI: 10.3390/cells12121592] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 05/27/2023] [Accepted: 06/06/2023] [Indexed: 06/29/2023] Open
Abstract
Owing to the presence of multiple enzymatic domains, LRRK2 has been associated with a diverse set of cellular functions and signaling pathways. It also has several pathological mutant-variants, and their incidences show ethnicity biases and drug-response differences with expression in dopaminergic-neurons and astrocytes. Here, we aimed to assess the cell-intrinsic effect of the LRRK2-I1371V mutant variant, prevalent in East Asian populations, on astrocyte yield and biology, involving Nrf2-mediated glutathione machinery, glutamate uptake and metabolism, and ATP generation in astrocytes derived from LRRK2-I1371V PD patient iPSCs and independently confirmed in LRRK2-I1371V-overexpressed U87 cells. Astrocyte yield (GFAP-immunopositive) was comparable between LRRK2-I1371V and healthy control (HC) populations; however, the astrocytic capability to mitigate oxidative stress in terms of glutathione content was significantly reduced in the mutant astrocytes, along with a reduction in the gene expression of the enzymes involved in glutathione machinery and nuclear factor erythroid 2-related factor 2 (Nrf2) expression. Simultaneously, a significant decrease in glutamate uptake was observed in LRRK2-I1371V astrocytes, with lower gene expression of glutamate transporters SLC1A2 and SLC1A3. The reduction in the protein expression of SLC1A2 was also directly confirmed. Enzymes catalyzing the generation of γ glutamyl cysteine (precursor of glutathione) from glutamate and the metabolism of glutamate to enter the Krebs cycle (α-ketoglutaric acid) were impaired, with significantly lower ATP generation in LRRK2-I1371V astrocytes. De novo glutamine synthesis via the conversion of glutamate to glutamine was also affected, indicating glutamate metabolism disorder. Our data demonstrate for the first time that the mutation in the LRRK2-I1371V allele causes significant astrocytic dysfunction with respect to Nrf2-mediated antioxidant machinery, AT -generation, and glutamate metabolism, even with comparable astrocyte yields.
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Affiliation(s)
- Roon Banerjee
- Department of Biophysics, National Institute of Mental Health and Neurosciences, Institute of National Importance, Bengaluru 560029, Karnataka, India
| | - Aishwarya Raj
- Department of Biophysics, National Institute of Mental Health and Neurosciences, Institute of National Importance, Bengaluru 560029, Karnataka, India
| | - Chandrakanta Potdar
- Department of Biophysics, National Institute of Mental Health and Neurosciences, Institute of National Importance, Bengaluru 560029, Karnataka, India
| | - Pramod Kumar Pal
- Department of Neurology, National Institute of Mental Health and Neurosciences, Institute of National Importance, Bengaluru 560029, Karnataka, India
| | - Ravi Yadav
- Department of Neurology, National Institute of Mental Health and Neurosciences, Institute of National Importance, Bengaluru 560029, Karnataka, India
| | - Nitish Kamble
- Department of Neurology, National Institute of Mental Health and Neurosciences, Institute of National Importance, Bengaluru 560029, Karnataka, India
| | - Vikram Holla
- Department of Neurology, National Institute of Mental Health and Neurosciences, Institute of National Importance, Bengaluru 560029, Karnataka, India
| | - Indrani Datta
- Department of Biophysics, National Institute of Mental Health and Neurosciences, Institute of National Importance, Bengaluru 560029, Karnataka, India
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Jagtap S, Potdar C, Yadav R, Pal PK, Datta I. Dopaminergic Neurons Differentiated from LRRK2 I1371V-Induced Pluripotent Stem Cells Display a Lower Yield, α-Synuclein Pathology, and Functional Impairment. ACS Chem Neurosci 2022; 13:2632-2645. [PMID: 36006382 DOI: 10.1021/acschemneuro.2c00297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Being a large multidomain protein, LRRK2 has several confirmed pathological mutant variants for PD, and the incidence of these variants shows ethnicity biases. I1371V, a mutation in the GTPase domain, has been reported in East-Asian populations, but there are no studies reported on dopaminergic (DA) neurons differentiated from this variant. The aim here was to assess the yield, function, and α-synuclein pathology of DA neurons differentiated from LRRK2 I1371V iPSCs. FACS analysis of neural progenitors (NPs) showed a comparable immunopositive population of cells for neural and glial progenitor markers nestin and S100β; however, NPs from I1371V iPSCs showed lower clonogenic and proliferative capacities than healthy control NPs as determined by the neurosphere assay and Ki67 expression. Floor plate cells obtained from I1371V NPs primed with FGF8 showed distinctly lower immunopositivity for FOXA2 and CLIC5 than healthy control FPCs and similar DOC2B expression. On SHH addition, a similar mature neuronal population was obtained from both groups; however, the yield of TH-immunopositive cells was significantly lower in I1371V, with lower expression of mature DA neuronal markers En1, Nurr1, and DAT. Vesicular dopamine release and intracellular Ca2+ response with KCl stimulation were lower in I1371V DA neurons, along with a significantly reduced expression of resting vesicle marker VMAT2. A concurrently lower expression of PSD95/Syn-I immunopositive puncta was observed in I1371V differentiated cells. Further, higher phosphorylation of α-synuclein and aggregation of oligomeric α-synuclein in I1371V DA neurons were observed. Our data demonstrated conclusively for the first time that mutations in the I1371V allele of LRRK2 showed developmental deficit from the FPC stage and generated a lower yield/number of TH-immunopositive neurons with impairment in their function and synapse density along with increased α-synuclein pathology.
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Affiliation(s)
- Soham Jagtap
- Department of Biophysics, National Institute of Mental Health and Neurosciences, Institute of National Importance, Bengaluru 560029, Karnataka, India
| | - Chandrakanta Potdar
- Department of Biophysics, National Institute of Mental Health and Neurosciences, Institute of National Importance, Bengaluru 560029, Karnataka, India
| | - Ravi Yadav
- Department of Neurology, National Institute of Mental Health and Neurosciences, Institute of National Importance, Bengaluru 560029, Karnataka, India
| | - Pramod Kumar Pal
- Department of Neurology, National Institute of Mental Health and Neurosciences, Institute of National Importance, Bengaluru 560029, Karnataka, India
| | - Indrani Datta
- Department of Biophysics, National Institute of Mental Health and Neurosciences, Institute of National Importance, Bengaluru 560029, Karnataka, India
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Potdar C, Kaushal A, Raj A, Mallick R, Datta I. Reduction of phosphorylated α-synuclein through downregulation of casein kinase 2α alleviates dopaminergic-neuronal function. Biochem Biophys Res Commun 2022; 615:43-48. [DOI: 10.1016/j.bbrc.2022.05.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2022] [Revised: 04/28/2022] [Accepted: 05/08/2022] [Indexed: 11/02/2022]
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Bhaskar S, Sheshadri P, Joseph JP, Potdar C, Prasanna J, Kumar A. Mitochondrial Superoxide Dismutase Specifies Early Neural Commitment by Modulating Mitochondrial Dynamics. iScience 2020; 23:101564. [PMID: 33083732 PMCID: PMC7522125 DOI: 10.1016/j.isci.2020.101564] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 07/28/2020] [Accepted: 09/11/2020] [Indexed: 12/02/2022] Open
Abstract
Studies revealing molecular mechanisms underlying neural specification have majorly focused on the role played by different transcription factors, but less on non-nuclear components. Earlier, we reported mitochondrial superoxide dismutase (SOD2) to be essential for self-renewal and pluripotency of mouse embryonic stem cells (mESCs). In the present study, we found SOD2 to be specifically required for neural lineage, but not the meso- or endoderm specification. Temporally, SOD2 regulated early neural genes, but not the matured genes, by modulating mitochondrial dynamics—specifically by enhancing the mitochondrial fusion protein Mitofusin 2 (MFN2). Bio-complementation strategy further confirmed SOD2 to enhance mitochondrial fusion process independent of its antioxidant activity. Over-expression of SOD2 along with OCT4, but neither alone, transdifferentiated mouse fibroblasts to neural progenitor-like colonies, conclusively proving the neurogenic potential of SOD2. In conclusion, our findings accredit a novel role for SOD2 in early neural lineage specification. SOD2 is essential for early neural differentiation of mESCs Up-regulation of MFN2, but not MFN1, underlies SOD2-mediated neurogenesis Antioxidant enzymatic activity of SOD2 is dispensable for mitochondrial fusion Overexpression of SOD2 with OCT4 transdifferentiate MEFs to iNPLCs
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Affiliation(s)
- Smitha Bhaskar
- Manipal Institute of Regenerative Medicine, Manipal Academy of Higher Education, Allalasandra, Yelahanka, Bengaluru, 560065 Karnataka, India
| | - Preethi Sheshadri
- Manipal Institute of Regenerative Medicine, Manipal Academy of Higher Education, Allalasandra, Yelahanka, Bengaluru, 560065 Karnataka, India
| | - Joel P Joseph
- Manipal Institute of Regenerative Medicine, Manipal Academy of Higher Education, Allalasandra, Yelahanka, Bengaluru, 560065 Karnataka, India
| | - Chandrakanta Potdar
- Manipal Institute of Regenerative Medicine, Manipal Academy of Higher Education, Allalasandra, Yelahanka, Bengaluru, 560065 Karnataka, India
| | - Jyothi Prasanna
- Manipal Institute of Regenerative Medicine, Manipal Academy of Higher Education, Allalasandra, Yelahanka, Bengaluru, 560065 Karnataka, India
| | - Anujith Kumar
- Manipal Institute of Regenerative Medicine, Manipal Academy of Higher Education, Allalasandra, Yelahanka, Bengaluru, 560065 Karnataka, India
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Datta I, Sowmithra, Jagtap S, Potdar C, Yadav R, Pal P. Generation of induced pluripotent stem cells (NIMHi001-A) from a Parkinson's disease patient of East Indian ethnicity carrying LRRK2 I1371V variant. Stem Cell Res 2020; 44:101768. [PMID: 32244201 DOI: 10.1016/j.scr.2020.101768] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 03/04/2020] [Accepted: 03/10/2020] [Indexed: 11/25/2022] Open
Abstract
Mutations in the Leucine Repeat Rich Kinase-2 (LRRK2) gene have been reported in familial Parkinson's disease (PD) cases. We have generated induced pluripotent stem cells (iPSCs) using Sendai-virus reprogramming-method from peripheral blood mononuclear cells of PD-patient of East-Indian ethnicity carrying the I1371V mutation in LRRK2 gene. PD diagnosis was performed using Unified Parkinson's Disease rating scale (UPDRS) score and confirmed by [18F]fluoro-l-dopa [F-DOPA] positron emission tomography (F-DOPA PET). The iPSC line was characterized for self-renewal and pluripotency. This cellular model will provide a valuable resource not only for drug-screening platform but also to understand the pathophysiology of this disease.
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Affiliation(s)
- Indrani Datta
- Department of Biophysics, National Institute of Mental Health and Neurosciences, Bengaluru 560029, Karnataka, India.
| | - Sowmithra
- Department of Biophysics, National Institute of Mental Health and Neurosciences, Bengaluru 560029, Karnataka, India
| | - Soham Jagtap
- Department of Biophysics, National Institute of Mental Health and Neurosciences, Bengaluru 560029, Karnataka, India
| | - Chandrakanta Potdar
- Department of Biophysics, National Institute of Mental Health and Neurosciences, Bengaluru 560029, Karnataka, India
| | - Ravi Yadav
- Department of Neurology, National Institute of Mental Health and Neurosciences, Bengaluru 560029, Karnataka, India
| | - Pramod Pal
- Department of Neurology, National Institute of Mental Health and Neurosciences, Bengaluru 560029, Karnataka, India
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