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Zolov SN, Imai H, Losiewicz MK, Singh RSJ, Fort PE, Gardner TW. Insulin-like growth factor-2 regulates basal retinal insulin receptor activity. J Biol Chem 2021; 296:100712. [PMID: 33915127 PMCID: PMC8138762 DOI: 10.1016/j.jbc.2021.100712] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 04/15/2021] [Accepted: 04/23/2021] [Indexed: 11/14/2022] Open
Abstract
The retinal insulin receptor (IR) exhibits basal kinase activity equivalent to that of the liver of fed animals, but unlike the liver, does not fluctuate with feeding and fasting; it also declines rapidly after the onset of insulin-deficient diabetes. The ligand(s) that determine basal IR activity in the retina has not been identified. Using a highly sensitive insulin assay, we found that retinal insulin concentrations remain constant in fed versus fasted rats and in diabetic versus control rats; vitreous fluid insulin levels were undetectable. Neutralizing antibodies against insulin-like growth factor 2 (IGF-2), but not insulin-like growth factor 1 (IGF-1) or insulin, decreased IR kinase activity in normal rat retinas, and depletion of IGF-2 from serum specifically reduced IR phosphorylation in retinal cells. Immunoprecipitation studies demonstrated that IGF-2 induced greater phosphorylation of the retinal IR than the IGF-1 receptor. Retinal IGF-2 mRNA content was 10-fold higher in adults than pups and orders of magnitude higher than in liver. Diabetes reduced retinal IGF-2, but not IGF-1 or IR, mRNA levels, and reduced IGF-2 and IGF-1 content in vitreous fluid. Finally, intravitreal administration of IGF-2 (mature and pro-forms) increased retinal IR and Akt kinase activity in diabetic rats. Collectively, these data reveal that IGF-2 is the primary ligand that defines basal retinal IR activity and suggest that reduced ocular IGF-2 may contribute to reduced IR activity in response to diabetes. These findings may have importance for understanding the regulation of metabolic and prosurvival signaling in the retina.
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Affiliation(s)
- Sergey N Zolov
- Department of Ophthalmology & Visual Sciences, University of Michigan Medical School, Ann Arbor, Michigan, USA; Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, Michigan, USA; The Division of Pulmonary & Critical Care Medicine, University of Michigan Medical School, Ann Arbor, Michigan, USA.
| | - Hisanori Imai
- Department of Ophthalmology, Kobe University Medical School, Kobe, Japan
| | - Mandy K Losiewicz
- Department of Ophthalmology & Visual Sciences, University of Michigan Medical School, Ann Arbor, Michigan, USA
| | | | - Patrice E Fort
- Department of Ophthalmology & Visual Sciences, University of Michigan Medical School, Ann Arbor, Michigan, USA; Department of Molecular & Integrative Physiology, University of Michigan Medical School, Ann Arbor, Michigan, USA
| | - Thomas W Gardner
- Department of Ophthalmology & Visual Sciences, University of Michigan Medical School, Ann Arbor, Michigan, USA; Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, Michigan, USA; Department of Molecular & Integrative Physiology, University of Michigan Medical School, Ann Arbor, Michigan, USA
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García-Huerta P, Troncoso-Escudero P, Wu D, Thiruvalluvan A, Cisternas-Olmedo M, Henríquez DR, Plate L, Chana-Cuevas P, Saquel C, Thielen P, Longo KA, Geddes BJ, Lederkremer GZ, Sharma N, Shenkman M, Naphade S, Sardi SP, Spichiger C, Richter HG, Court FA, Tshilenge KT, Ellerby LM, Wiseman RL, Gonzalez-Billault C, Bergink S, Vidal RL, Hetz C. Insulin-like growth factor 2 (IGF2) protects against Huntington's disease through the extracellular disposal of protein aggregates. Acta Neuropathol 2020; 140:737-764. [PMID: 32642868 PMCID: PMC8513574 DOI: 10.1007/s00401-020-02183-1] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Revised: 06/06/2020] [Accepted: 06/19/2020] [Indexed: 12/13/2022]
Abstract
Impaired neuronal proteostasis is a salient feature of many neurodegenerative diseases, highlighting alterations in the function of the endoplasmic reticulum (ER). We previously reported that targeting the transcription factor XBP1, a key mediator of the ER stress response, delays disease progression and reduces protein aggregation in various models of neurodegeneration. To identify disease modifier genes that may explain the neuroprotective effects of XBP1 deficiency, we performed gene expression profiling of brain cortex and striatum of these animals and uncovered insulin-like growth factor 2 (Igf2) as the major upregulated gene. Here, we studied the impact of IGF2 signaling on protein aggregation in models of Huntington's disease (HD) as proof of concept. Cell culture studies revealed that IGF2 treatment decreases the load of intracellular aggregates of mutant huntingtin and a polyglutamine peptide. These results were validated using induced pluripotent stem cells (iPSC)-derived medium spiny neurons from HD patients and spinocerebellar ataxia cases. The reduction in the levels of mutant huntingtin was associated with a decrease in the half-life of the intracellular protein. The decrease in the levels of abnormal protein aggregation triggered by IGF2 was independent of the activity of autophagy and the proteasome pathways, the two main routes for mutant huntingtin clearance. Conversely, IGF2 signaling enhanced the secretion of soluble mutant huntingtin species through exosomes and microvesicles involving changes in actin dynamics. Administration of IGF2 into the brain of HD mice using gene therapy led to a significant decrease in the levels of mutant huntingtin in three different animal models. Moreover, analysis of human postmortem brain tissue and blood samples from HD patients showed a reduction in IGF2 level. This study identifies IGF2 as a relevant factor deregulated in HD, operating as a disease modifier that buffers the accumulation of abnormal protein species.
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Affiliation(s)
- Paula García-Huerta
- Faculty of Medicine, Biomedical Neuroscience Institute, University of Chile, Santiago, Chile
- Center for Geroscience, Brain Health and Metabolism, Santiago, Chile
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, Sector B, Second Floor, Faculty of Medicine, University of Chile, Independencia 1027, P.O. Box 70086, Santiago, Chile
| | - Paulina Troncoso-Escudero
- Faculty of Medicine, Biomedical Neuroscience Institute, University of Chile, Santiago, Chile
- Center for Geroscience, Brain Health and Metabolism, Santiago, Chile
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, Sector B, Second Floor, Faculty of Medicine, University of Chile, Independencia 1027, P.O. Box 70086, Santiago, Chile
- Center for Integrative Biology, Faculty of Sciences, University Mayor, Santiago, Chile
| | - Di Wu
- Department of Biomedical Sciences of Cells and Systems, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Arun Thiruvalluvan
- Department of Biomedical Sciences of Cells and Systems, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Marisol Cisternas-Olmedo
- Faculty of Medicine, Biomedical Neuroscience Institute, University of Chile, Santiago, Chile
- Center for Geroscience, Brain Health and Metabolism, Santiago, Chile
- Center for Integrative Biology, Faculty of Sciences, University Mayor, Santiago, Chile
| | - Daniel R Henríquez
- Center for Geroscience, Brain Health and Metabolism, Santiago, Chile
- Department of Cell Biology, Faculty of Sciences, University of Chile, Santiago, Chile
| | - Lars Plate
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA, USA
| | - Pedro Chana-Cuevas
- Faculty of Medical Sciences, University of Santiago de Chile, Santiago, Chile
| | - Cristian Saquel
- Center for Geroscience, Brain Health and Metabolism, Santiago, Chile
- Center for Integrative Biology, Faculty of Sciences, University Mayor, Santiago, Chile
| | - Peter Thielen
- Department of Immunology and Infectious Diseases, Harvard School of Public Health, Boston, MA, 02115, USA
| | | | | | - Gerardo Z Lederkremer
- Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
- George Wise Faculty of Life Sciences, School of Molecular Cell Biology and Biotechnology, Tel Aviv University, Tel Aviv, Israel
| | - Neeraj Sharma
- Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
- George Wise Faculty of Life Sciences, School of Molecular Cell Biology and Biotechnology, Tel Aviv University, Tel Aviv, Israel
| | - Marina Shenkman
- Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
- George Wise Faculty of Life Sciences, School of Molecular Cell Biology and Biotechnology, Tel Aviv University, Tel Aviv, Israel
| | - Swati Naphade
- Buck Institute for Research on Aging, Novato, CA, 94945, USA
| | - S Pablo Sardi
- Rare and Neurological Diseases Therapeutic Area, Sanofi, 49 New York Avenue, Framingham, MA, 01701, USA
| | - Carlos Spichiger
- Faculty of Sciences, Institute of Biochemistry and Microbiology, University Austral of Chile, Valdivia, Chile
| | - Hans G Richter
- Faculty of Medicine, Institute of Anatomy, Histology and Pathology, University Austral of Chile, Valdivia, Chile
| | - Felipe A Court
- Center for Geroscience, Brain Health and Metabolism, Santiago, Chile
- Center for Integrative Biology, Faculty of Sciences, University Mayor, Santiago, Chile
- Buck Institute for Research on Aging, Novato, CA, 94945, USA
| | | | - Lisa M Ellerby
- Buck Institute for Research on Aging, Novato, CA, 94945, USA
| | - R Luke Wiseman
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA, USA
| | - Christian Gonzalez-Billault
- Center for Geroscience, Brain Health and Metabolism, Santiago, Chile
- Department of Cell Biology, Faculty of Sciences, University of Chile, Santiago, Chile
- Buck Institute for Research on Aging, Novato, CA, 94945, USA
| | - Steven Bergink
- Department of Biomedical Sciences of Cells and Systems, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Rene L Vidal
- Faculty of Medicine, Biomedical Neuroscience Institute, University of Chile, Santiago, Chile.
- Center for Geroscience, Brain Health and Metabolism, Santiago, Chile.
- Center for Integrative Biology, Faculty of Sciences, University Mayor, Santiago, Chile.
| | - Claudio Hetz
- Faculty of Medicine, Biomedical Neuroscience Institute, University of Chile, Santiago, Chile.
- Center for Geroscience, Brain Health and Metabolism, Santiago, Chile.
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences, Sector B, Second Floor, Faculty of Medicine, University of Chile, Independencia 1027, P.O. Box 70086, Santiago, Chile.
- Buck Institute for Research on Aging, Novato, CA, 94945, USA.
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Alves CJ, Dariolli R, Jorge FM, Monteiro MR, Maximino JR, Martins RS, Strauss BE, Krieger JE, Callegaro D, Chadi G. Gene expression profiling for human iPS-derived motor neurons from sporadic ALS patients reveals a strong association between mitochondrial functions and neurodegeneration. Front Cell Neurosci 2015; 9:289. [PMID: 26300727 PMCID: PMC4523944 DOI: 10.3389/fncel.2015.00289] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Accepted: 07/14/2015] [Indexed: 01/29/2023] Open
Abstract
Amyotrophic Lateral Sclerosis (ALS) is a fatal neurodegenerative disease that leads to widespread motor neuron death, general palsy and respiratory failure. The most prevalent sporadic ALS form is not genetically inherited. Attempts to translate therapeutic strategies have failed because the described mechanisms of disease are based on animal models carrying specific gene mutations and thus do not address sporadic ALS. In order to achieve a better approach to study the human disease, human induced pluripotent stem cell (hiPSC)-differentiated motor neurons were obtained from motor nerve fibroblasts of sporadic ALS and non-ALS subjects using the STEMCCA Cre-Excisable Constitutive Polycistronic Lentivirus system and submitted to microarray analyses using a whole human genome platform. DAVID analyses of differentially expressed genes identified molecular function and biological process-related genes through Gene Ontology. REVIGO highlighted the related functions mRNA and DNA binding, GTP binding, transcription (co)-repressor activity, lipoprotein receptor binding, synapse organization, intracellular transport, mitotic cell cycle and cell death. KEGG showed pathways associated with Parkinson's disease and oxidative phosphorylation, highlighting iron homeostasis, neurotrophic functions, endosomal trafficking and ERK signaling. The analysis of most dysregulated genes and those representative of the majority of categorized genes indicates a strong association between mitochondrial function and cellular processes possibly related to motor neuron degeneration. In conclusion, iPSC-derived motor neurons from motor nerve fibroblasts of sporadic ALS patients may recapitulate key mechanisms of neurodegeneration and may offer an opportunity for translational investigation of sporadic ALS. Large gene profiling of differentiated motor neurons from sporadic ALS patients highlights mitochondrial participation in the establishment of autonomous mechanisms associated with sporadic ALS.
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Affiliation(s)
- Chrystian J Alves
- Department of Neurology, Neuroregeneration Center, University of São Paulo School of Medicine, University of São Paulo São Paulo, Brazil
| | - Rafael Dariolli
- Laboratory of Genetics and Molecular Cardiology/LIM13, Heart Institute, University of São Paulo School of Medicine São Paulo, Brazil
| | - Frederico M Jorge
- Department of Neurology, Neuroregeneration Center, University of São Paulo School of Medicine, University of São Paulo São Paulo, Brazil
| | - Matheus R Monteiro
- Department of Neurology, Neuroregeneration Center, University of São Paulo School of Medicine, University of São Paulo São Paulo, Brazil
| | - Jessica R Maximino
- Department of Neurology, Neuroregeneration Center, University of São Paulo School of Medicine, University of São Paulo São Paulo, Brazil
| | - Roberto S Martins
- Department of Neurosurgery, Surgical Center of Functional Neurosurgery, Clinics Hospital of University of São Paulo São Paulo, Brazil
| | - Bryan E Strauss
- Viral Vector Laboratory, Center for Translational Investigation in Oncology/LIM24, Cancer Institute of São Paulo, University of São Paulo School of Medicine São Paulo, Brazil
| | - José E Krieger
- Laboratory of Genetics and Molecular Cardiology/LIM13, Heart Institute, University of São Paulo School of Medicine São Paulo, Brazil
| | - Dagoberto Callegaro
- Department of Neurology, Neuroregeneration Center, University of São Paulo School of Medicine, University of São Paulo São Paulo, Brazil
| | - Gerson Chadi
- Department of Neurology, Neuroregeneration Center, University of São Paulo School of Medicine, University of São Paulo São Paulo, Brazil
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Schwartz CM, Tavakoli T, Jamias C, Park SS, Maudsley S, Martin B, Phillips TM, Yao PJ, Itoh K, Ma W, Rao MS, Arenas E, Mattson MP. Stromal factors SDF1α, sFRP1, and VEGFD induce dopaminergic neuron differentiation of human pluripotent stem cells. J Neurosci Res 2012; 90:1367-81. [PMID: 22535492 PMCID: PMC3350575 DOI: 10.1002/jnr.23064] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2011] [Accepted: 03/16/2012] [Indexed: 12/21/2022]
Abstract
Human embryonic stem cell (hESC)-derived dopaminergic (DA) neurons hold potential for treating Parkinson's disease (PD) through cell replacement therapy. Generation of DA neurons from hESCs has been achieved by coculture with the stromal cell line PA6, a source of stromal cell-derived inducing activity (SDIA). However, the factors produced by stromal cells that result in SDIA are largely undefined. We previously reported that medium conditioned by PA6 cells can generate functional DA neurons from NTera2 human embryonal carcinoma stem cells. Here we show that PA6-conditioned medium can induce DA neuronal differentiation in both NTera2 cells and the hESC I6 cell line. To identify the factor(s) responsible for SDIA, we used large-scale microarray analysis of gene expression combined with mass spectrometric analysis of PA6-conditioned medium (CM). The candidate factors, hepatocyte growth factor (HGF), stromal cell-derived factor-1 α (SDF1α), secreted frizzled-related protein 1 (sFRP1), and vascular endothelial growth factor D (VEGFD) were identified, and their concentrations in PA6 CM were established by immunoaffinity capillary electrophoresis. Upon addition of SDF1α, sFRP1, and VEGFD to the culture medium, we observed an increase in the number of cells expressing tyrosine hydroxylase (a marker for DA neurons) and βIII-tubulin (a marker for immature neurons) in both the NTera2 and I6 cell lines. These results indicate that SDF1α, sFRP1, and VEGFD are major components of SDIA and suggest the potential use of these defined factors to elicit DA differentiation of pluripotent human stem cells for therapeutic intervention in PD.
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Affiliation(s)
- Catherine M. Schwartz
- National Institute on Aging Intramural Research Program, National Institutes of Health, Laboratory of Neurosciences, Baltimore, MD
- Department of Medical Biochemistry and Biophysics, Laboratory of Molecular Neurobiology, Karolinska Institutet, Stockholm, Sweden
| | - Tahereh Tavakoli
- Stem Cell Center, Developmental Biology, American Type Culture Collection, Manassas, VA
| | - Charmaine Jamias
- National Institute on Aging Intramural Research Program, National Institutes of Health, Laboratory of Neurosciences, Baltimore, MD
| | - Sung-Soo Park
- National Institute on Aging Intramural Research Program, National Institutes of Health, Laboratory of Neurosciences, Baltimore, MD
| | - Stuart Maudsley
- National Institute on Aging Intramural Research Program, National Institutes of Health, Laboratory of Neurosciences, Baltimore, MD
| | - Bronwen Martin
- National Institute on Aging Intramural Research Program, National Institutes of Health, Laboratory of Neurosciences, Baltimore, MD
| | - Terry M. Phillips
- National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Laboratory of Bioengineering and Physical Science, Bethesda, MD
| | - Pamela J. Yao
- National Institute on Aging Intramural Research Program, National Institutes of Health, Laboratory of Neurosciences, Baltimore, MD
| | - Katsuhiko Itoh
- Department of Clinical Molecular Biology, Kyoto University, Kyoto, Japan
| | - Wu Ma
- Stem Cell Center, Developmental Biology, American Type Culture Collection, Manassas, VA
| | | | - Ernest Arenas
- Department of Medical Biochemistry and Biophysics, Laboratory of Molecular Neurobiology, Karolinska Institutet, Stockholm, Sweden
| | - Mark P. Mattson
- National Institute on Aging Intramural Research Program, National Institutes of Health, Laboratory of Neurosciences, Baltimore, MD
- Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD, USA
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