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Ishiguro H, Ushiki T, Honda A, Yoshimatsu Y, Ohashi R, Okuda S, Kawasaki A, Cho K, Tamura S, Suwabe T, Katagiri T, Ling Y, Iijima A, Mikami T, Kitagawa H, Uemura A, Sango K, Masuko M, Igarashi M, Sone H. Reduced chondroitin sulfate content prevents diabetic neuropathy through transforming growth factor-β signaling suppression. iScience 2024; 27:109528. [PMID: 38595797 PMCID: PMC11002665 DOI: 10.1016/j.isci.2024.109528] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 11/08/2023] [Accepted: 03/15/2024] [Indexed: 04/11/2024] Open
Abstract
Diabetic neuropathy (DN) is a major complication of diabetes mellitus. Chondroitin sulfate (CS) is one of the most important extracellular matrix components and is known to interact with various diffusible factors; however, its role in DN pathology has not been examined. Therefore, we generated CSGalNAc-T1 knockout (T1KO) mice, in which CS levels were reduced. We demonstrated that diabetic T1KO mice were much more resistant to DN than diabetic wild-type (WT) mice. We also found that interactions between pericytes and vascular endothelial cells were more stable in T1KO mice. Among the RNA-seq results, we focused on the transforming growth factor β signaling pathway and found that the phosphorylation of Smad2/3 was less upregulated in T1KO mice than in WT mice under hyperglycemic conditions. Taken together, a reduction in CS level attenuates DN progression, indicating that CS is an important factor in DN pathogenesis.
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Affiliation(s)
- Hajime Ishiguro
- Departments of Hematology, Endocrinology, and Metabolism, Graduate School of Medical and Dental Sciences, Niigata university, Niigata, Japan
| | - Takashi Ushiki
- Departments of Hematology, Endocrinology, and Metabolism, Graduate School of Medical and Dental Sciences, Niigata university, Niigata, Japan
- Division of Hematology and Oncology, Graduate School of Health Sciences, Niigata University, Niigata, Japan
- Departments of Transfusion Medicine, Cell Therapy and Regenerative Medicine, Medical and Dental Hospital, Niigata University, Niigata, Japan
| | - Atsuko Honda
- Department of Neurochemistry and Molecular Cell Biology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
- Center for Research Promotion, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Yasuhiro Yoshimatsu
- Division of Pharmacology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Riuko Ohashi
- Divisions of Molecular and Diagnostic Pathology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Shujiro Okuda
- Division of Bioinformatics, Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Asami Kawasaki
- Department of Neurochemistry and Molecular Cell Biology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Kaori Cho
- Departments of Hematology, Endocrinology, and Metabolism, Graduate School of Medical and Dental Sciences, Niigata university, Niigata, Japan
| | - Suguru Tamura
- Departments of Hematology, Endocrinology, and Metabolism, Graduate School of Medical and Dental Sciences, Niigata university, Niigata, Japan
| | - Tatsuya Suwabe
- Departments of Hematology, Endocrinology, and Metabolism, Graduate School of Medical and Dental Sciences, Niigata university, Niigata, Japan
| | - Takayuki Katagiri
- Departments of Hematology, Endocrinology, and Metabolism, Graduate School of Medical and Dental Sciences, Niigata university, Niigata, Japan
| | - Yiwei Ling
- Division of Bioinformatics, Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Atsuhiko Iijima
- Neurophysiology & Biomedical Engineering Lab, Interdisciplinary Program of Biomedical Engineering, Assistive Technology and Art and Sports Sciences, Faculty of Engineering, Niigata University Niigata, Niigata, Japan
| | - Tadahisa Mikami
- Laboratory of Biochemistry, Kobe Pharmaceutical University, Kobe, Japan
| | - Hiroshi Kitagawa
- Laboratory of Biochemistry, Kobe Pharmaceutical University, Kobe, Japan
| | - Akiyoshi Uemura
- Department of Retinal Vascular Biology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Kazunori Sango
- Diabetic Neuropathy Project, Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan
| | - Masayoshi Masuko
- Departments of Hematology, Endocrinology, and Metabolism, Graduate School of Medical and Dental Sciences, Niigata university, Niigata, Japan
- Hematopoietic Cell Transplantation Niigata University Medical and Dental Hospital, , Niigata University, Niigata, Japan
| | - Michihiro Igarashi
- Department of Neurochemistry and Molecular Cell Biology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Hirohito Sone
- Departments of Hematology, Endocrinology, and Metabolism, Graduate School of Medical and Dental Sciences, Niigata university, Niigata, Japan
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Niimi N, Sango K. Gut microbiota dysbiosis as a novel pathogenic factor of diabetic peripheral neuropathy. J Diabetes Investig 2024. [PMID: 38563254 DOI: 10.1111/jdi.14203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Revised: 03/13/2024] [Accepted: 03/17/2024] [Indexed: 04/04/2024] Open
Affiliation(s)
- Naoko Niimi
- Diabetic Neuropathy Project, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan
| | - Kazunori Sango
- Diabetic Neuropathy Project, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan
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Nihei W, Kato A, Himeno T, Kondo M, Nakamura J, Kamiya H, Sango K, Kato K. Hyperglycaemia Aggravates Oxidised Low-Density Lipoprotein-Induced Schwann Cell Death via Hyperactivation of Toll-like Receptor 4. Neurol Int 2024; 16:370-379. [PMID: 38525707 PMCID: PMC10961767 DOI: 10.3390/neurolint16020027] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2024] [Revised: 03/15/2024] [Accepted: 03/18/2024] [Indexed: 03/26/2024] Open
Abstract
Increased low-density lipoprotein levels are risk factors for diabetic neuropathy. Diabetes mellitus is associated with elevated metabolic stress, leading to oxidised low-density lipoprotein formation. Therefore, it is important to investigate the mechanisms underlying the pathogenesis of diabetic neuropathy in diabetes complicated by dyslipidaemia with increased levels of oxidised low-density lipoprotein. Here, we examined the effects of hyperglycaemia and oxidised low-density lipoprotein treatment on Schwann cell death and its underlying mechanisms. Immortalised mouse Schwann cells were treated with oxidised low-density lipoprotein under normo- or hyperglycaemic conditions. We observed that oxidised low-density lipoprotein-induced cell death increased under hyperglycaemic conditions compared with normoglycaemic conditions. Moreover, hyperglycaemia and oxidised low-density lipoprotein treatment synergistically upregulated the gene and protein expression of toll-like receptor 4. Pre-treatment with TAK-242, a selective toll-like receptor 4 signalling inhibitor, attenuated hyperglycaemia- and oxidised low-density lipoprotein-induced cell death and apoptotic caspase-3 pathway. Our findings suggest that the hyperactivation of toll-like receptor 4 signalling by hyperglycaemia and elevated oxidised low-density lipoprotein levels synergistically exacerbated diabetic neuropathy; thus, it can be a potential therapeutic target for diabetic neuropathy.
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Affiliation(s)
- Wataru Nihei
- Laboratory of Medicine, Aichi Gakuin University School of Pharmacy, Nagoya 464-8650, Japan; (W.N.); (A.K.)
| | - Ayako Kato
- Laboratory of Medicine, Aichi Gakuin University School of Pharmacy, Nagoya 464-8650, Japan; (W.N.); (A.K.)
| | - Tatsuhito Himeno
- Division of Diabetes, Department of Internal Medicine, Aichi Medical University School of Medicine, Nagakute 480-1195, Japan (M.K.); (H.K.)
| | - Masaki Kondo
- Division of Diabetes, Department of Internal Medicine, Aichi Medical University School of Medicine, Nagakute 480-1195, Japan (M.K.); (H.K.)
| | - Jiro Nakamura
- Department of Innovative Diabetes Therapy, Aichi Medical University School of Medicine, Nagakute 480-1195, Japan;
| | - Hideki Kamiya
- Division of Diabetes, Department of Internal Medicine, Aichi Medical University School of Medicine, Nagakute 480-1195, Japan (M.K.); (H.K.)
| | - Kazunori Sango
- Diabetic Neuropathy Project, Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, Tokyo 156-8506, Japan;
| | - Koichi Kato
- Laboratory of Medicine, Aichi Gakuin University School of Pharmacy, Nagoya 464-8650, Japan; (W.N.); (A.K.)
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Yako H, Niimi N, Takaku S, Sango K. Advantages of omics approaches for elucidating metabolic changes in diabetic peripheral neuropathy. Front Endocrinol (Lausanne) 2023; 14:1208441. [PMID: 38089620 PMCID: PMC10715313 DOI: 10.3389/fendo.2023.1208441] [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] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Accepted: 11/15/2023] [Indexed: 12/18/2023] Open
Abstract
Various animal and cell culture models of diabetes mellitus (DM) have been established and utilized to study diabetic peripheral neuropathy (DPN). The divergence of metabolic abnormalities among these models makes their etiology complicated despite some similarities regarding the pathological and neurological features of DPN. Thus, this study aimed to review the omics approaches toward DPN, especially on the metabolic states in diabetic rats and mice induced by chemicals (streptozotocin and alloxan) as type 1 DM models and by genetic mutations (MKR, db/db and ob/ob) and high-fat diet as type 2 DM models. Omics approaches revealed that the pathways associated with lipid metabolism and inflammation in dorsal root ganglia and sciatic nerves were enriched and controlled in the levels of gene expression among these animal models. Additionally, these pathways were conserved in human DPN, indicating the pivotal pathogeneses of DPN. Omics approaches are beneficial tools to better understand the association of metabolic changes with morphological and functional abnormalities in DPN.
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Affiliation(s)
- Hideji Yako
- Diabetic Neuropathy Project, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan
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Sango K. Novel neuron-Schwann cell co-culture models to study peripheral nerve degeneration and regeneration. Neural Regen Res 2023; 18:1732-1733. [PMID: 36751798 PMCID: PMC10154494 DOI: 10.4103/1673-5374.363195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Affiliation(s)
- Kazunori Sango
- Diabetic Neuropathy Project, Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan
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Suzuki M, Kuromi H, Shindo M, Sakata N, Niimi N, Fukui K, Saitoe M, Sango K. A Drosophila model of diabetic neuropathy reveals a role of proteasome activity in the glia. iScience 2023; 26:106997. [PMID: 37378316 PMCID: PMC10291573 DOI: 10.1016/j.isci.2023.106997] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 03/31/2023] [Accepted: 05/25/2023] [Indexed: 06/29/2023] Open
Abstract
Diabetic peripheral neuropathy (DPN) is the most common chronic, progressive complication of diabetes mellitus. The main symptom is sensory loss; the molecular mechanisms are not fully understood. We found that Drosophila fed a high-sugar diet, which induces diabetes-like phenotypes, exhibit impairment of noxious heat avoidance. The impairment of heat avoidance was associated with shrinkage of the leg neurons expressing the Drosophila transient receptor potential channel Painless. Using a candidate genetic screening approach, we identified proteasome modulator 9 as one of the modulators of impairment of heat avoidance. We further showed that proteasome inhibition in the glia reversed the impairment of noxious heat avoidance, and heat-shock proteins and endolysosomal trafficking in the glia mediated the effect of proteasome inhibition. Our results establish Drosophila as a useful system for exploring molecular mechanisms of diet-induced peripheral neuropathy and propose that the glial proteasome is one of the candidate therapeutic targets for DPN.
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Affiliation(s)
- Mari Suzuki
- Diabetic Neuropathy Project, Tokyo Metropolitan Institute of Medical Science, Setagaya, Tokyo 156-8506, Japan
| | - Hiroshi Kuromi
- Learning and Memory Project, Tokyo Metropolitan Institute of Medical Science, Setagaya, Tokyo 156-8506, Japan
| | - Mayumi Shindo
- Center for Basic Technology Research, Tokyo Metropolitan Institute of Medical Science, Setagaya, Tokyo 156-8506, Japan
| | - Nozomi Sakata
- Diabetic Neuropathy Project, Tokyo Metropolitan Institute of Medical Science, Setagaya, Tokyo 156-8506, Japan
- Department of Bioscience and Engineering, Shibaura Institute of Technology, Saitama 337-8570, Japan
| | - Naoko Niimi
- Diabetic Neuropathy Project, Tokyo Metropolitan Institute of Medical Science, Setagaya, Tokyo 156-8506, Japan
| | - Koji Fukui
- Department of Bioscience and Engineering, Shibaura Institute of Technology, Saitama 337-8570, Japan
| | - Minoru Saitoe
- Learning and Memory Project, Tokyo Metropolitan Institute of Medical Science, Setagaya, Tokyo 156-8506, Japan
| | - Kazunori Sango
- Diabetic Neuropathy Project, Tokyo Metropolitan Institute of Medical Science, Setagaya, Tokyo 156-8506, Japan
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Nagai Y, Matoba K, Yako H, Ohashi S, Sekiguchi K, Mitsuyoshi E, Sango K, Kawanami D, Utsunomiya K, Nishimura R. Rho-kinase inhibitor restores glomerular fatty acid metabolism in diabetic kidney disease. Biochem Biophys Res Commun 2023; 649:32-38. [PMID: 36739697 DOI: 10.1016/j.bbrc.2023.01.088] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 01/25/2023] [Accepted: 01/28/2023] [Indexed: 02/01/2023]
Abstract
The small GTPase Rho and its effector Rho-kinase (ROCK) are activated in the diabetic kidney, and recent studies decade have demonstrated that ROCK signaling is an integral pathway in the progression of diabetic kidney disease. We previously identified the distinct role of ROCK1, an isoform of ROCK, in fatty acid metabolism in diabetic glomeruli. However, the effect of pharmacological intervention for ROCK1 is not clear. In the present study, we show that the inhibition of ROCK1 by Y-27632 and fasudil restores fatty acid oxidation in the glomeruli. Mechanistically, these compounds optimize fatty acid utilization and redox balance in mesangial cells via AMPK phosphorylation and the subsequent induction of PGC-1α. A further in vivo study showed that the inhibition of ROCK1 suppressed the downregulation of the fatty acid oxidation-related gene expression in glomeruli and mitochondrial fragmentation in the mesangial cells of db/db mice. These observations indicate that ROCK1 could be a promising therapeutic target for diabetic kidney disease through a mechanism that improves glomerular fatty acid metabolism.
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Affiliation(s)
- Yosuke Nagai
- Division of Diabetes, Metabolism, and Endocrinology, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan
| | - Keiichiro Matoba
- Division of Diabetes, Metabolism, and Endocrinology, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan.
| | - Hideji Yako
- Diabetic Neuropathy Project, Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan
| | - Shinji Ohashi
- Division of Diabetes, Metabolism, and Endocrinology, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan
| | - Kensuke Sekiguchi
- Division of Diabetes, Metabolism, and Endocrinology, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan
| | - Etsuko Mitsuyoshi
- Division of Diabetes, Metabolism, and Endocrinology, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan
| | - Kazunori Sango
- Diabetic Neuropathy Project, Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan
| | - Daiji Kawanami
- Department of Endocrinology and Diabetes Mellitus, Fukuoka University School of Medicine, Fukuoka, Japan
| | | | - Rimei Nishimura
- Division of Diabetes, Metabolism, and Endocrinology, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan
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Murakami T, Ito Y, Sango K, Watabe K, Sunada Y. Human transthyretin gene expression is markedly increased in repair Schwann cells in an in vitro model of hereditary transthyretin amyloidosis. Neurochem Int 2023; 164:105507. [PMID: 36796540 DOI: 10.1016/j.neuint.2023.105507] [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] [Received: 12/12/2022] [Revised: 02/09/2023] [Accepted: 02/12/2023] [Indexed: 02/16/2023]
Abstract
Hereditary transthyretin (TTR) amyloidosis (ATTRv) is characterized by TTR amyloid deposition in the peripheral nervous system. It remains unknown why variant TTR preferentially deposits in the peripheral nerves and dorsal root ganglia. We previously detected low levels of TTR expression in Schwann cells and established an immortalized Schwann cell line, TgS1, derived from a mouse model of ATTRv amyloidosis expressing the variant TTR gene. In the present study, the expression of TTR and Schwann cell marker genes was investigated in TgS1 cells by quantitative RT-PCR. TTR gene expression was markedly upregulated in TgS1 cells incubated in non-growth medium-Dulbecco's modified Eagle's medium supplemented with 10% fetal bovine serum. The expression levels of c-Jun, Gdnf and Sox2 were increased, while Mpz was downregulated, suggesting that TgS1 cells exhibit a repair Schwann cell-like phenotype in the non-growth medium. Western blot analysis revealed that TTR protein was produced and secreted by the TgS1 cells. Furthermore, downregulation of Hsf1 with siRNA induced TTR aggregates in the TgS1 cells. These findings indicate that TTR expression is markedly increased in repair Schwann cells, likely to promote axonal regeneration. Therefore, aged dysfunctional repair Schwann cells may cause the deposition of variant TTR aggregates in the nerves of patients with ATTRv.
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Affiliation(s)
- Tatsufumi Murakami
- Department of Neurology, Kawasaki Medical School, Kurashiki, Okayama, 701-0192, Japan; Faculty of Rehabilitation, Kawasaki University of Medical Welfare, Kurashiki, Okayama, 701-0193, Japan.
| | - Yuri Ito
- Faculty of Rehabilitation, Kawasaki University of Medical Welfare, Kurashiki, Okayama, 701-0193, Japan
| | - Kazunori Sango
- Diabetic Neuropathy Project, Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, Tokyo, 156-8506, Japan
| | - Kazuhiko Watabe
- Department of Medical Technology, Faculty of Health Sciences, Kyorin University, Tokyo, 181-8612, Japan
| | - Yoshihide Sunada
- Department of Neurology, Kawasaki Medical School, Kurashiki, Okayama, 701-0192, Japan
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Ali H, Kobayashi M, Morito K, Hasi RY, Aihara M, Hayashi J, Kawakami R, Tsuchiya K, Sango K, Tanaka T. Peroxisomes attenuate cytotoxicity of very long-chain fatty acids. Biochim Biophys Acta Mol Cell Biol Lipids 2023; 1868:159259. [PMID: 36460260 DOI: 10.1016/j.bbalip.2022.159259] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 10/13/2022] [Accepted: 11/10/2022] [Indexed: 12/02/2022]
Abstract
One of the major functions of peroxisomes in mammals is oxidation of very long-chain fatty acids (VLCFAs). Genetic defects in peroxisomal β-oxidation result in the accumulation of VLCFAs and lead to a variety of health problems, such as demyelination of nervous tissues. However, the mechanisms by which VLCFAs cause tissue degeneration have not been fully elucidated. Recently, we found that the addition of small amounts of isopropanol can enhance the solubility of saturated VLCFAs in an aqueous medium. In this study, we characterized the biological effect of extracellular VLCFAs in peroxisome-deficient Chinese hamster ovary (CHO) cells, neural crest-derived pheochromocytoma cells (PC12), and immortalized adult Fischer rat Schwann cells (IFRS1) using this solubilizing technique. C20:0 FA was the most toxic of the C16-C26 FAs tested in all cells. The basis of the toxicity of C20:0 FA was apoptosis and was observed at 5 μM and 30 μM in peroxisome-deficient and wild-type CHO cells, respectively. The sensitivity of wild-type CHO cells to cytotoxic C20:0 FA was enhanced in the presence of a peroxisomal β-oxidation inhibitor. Further, a positive correlation was evident between cell toxicity and the extent of intracellular accumulation of toxic FA. These results suggest that peroxisomes are pivotal in the detoxification of apoptotic VLCFAs by preventing their accumulation.
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Affiliation(s)
- Hanif Ali
- Graduate School of Technology, Industrial and Social Sciences, Tokushima University, Tokushima 770-8502, Japan; Graduate School of Biomedical Sciences, Tokushima University, Tokushima 770-8505, Japan
| | - Miyu Kobayashi
- Graduate School of Technology, Industrial and Social Sciences, Tokushima University, Tokushima 770-8502, Japan
| | - Katsuya Morito
- Graduate School of Biomedical Sciences, Tokushima University, Tokushima 770-8505, Japan
| | - Rumana Yesmin Hasi
- Graduate School of Technology, Industrial and Social Sciences, Tokushima University, Tokushima 770-8502, Japan
| | - Mutsumi Aihara
- Graduate School of Technology, Industrial and Social Sciences, Tokushima University, Tokushima 770-8502, Japan
| | - Junji Hayashi
- Graduate School of Technology, Industrial and Social Sciences, Tokushima University, Tokushima 770-8502, Japan
| | - Ryushi Kawakami
- Graduate School of Technology, Industrial and Social Sciences, Tokushima University, Tokushima 770-8502, Japan
| | - Koichiro Tsuchiya
- Graduate School of Biomedical Sciences, Tokushima University, Tokushima 770-8505, Japan
| | - Kazunori Sango
- Diabetic Neuropathy Project, Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, Tokyo 156-8506, Japan
| | - Tamotsu Tanaka
- Graduate School of Technology, Industrial and Social Sciences, Tokushima University, Tokushima 770-8502, Japan.
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Osonoi S, Mizukami H, Takeuchi Y, Sugawa H, Ogasawara S, Takaku S, Sasaki T, Kudoh K, Ito K, Sango K, Nagai R, Yamamoto Y, Daimon M, Yamamoto H, Yagihashi S. RAGE activation in macrophages and development of experimental diabetic polyneuropathy. JCI Insight 2022; 7:160555. [PMID: 36477360 PMCID: PMC9746912 DOI: 10.1172/jci.insight.160555] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Accepted: 10/19/2022] [Indexed: 12/12/2022] Open
Abstract
It is suggested that activation of receptor for advanced glycation end products (RAGE) induces proinflammatory response in diabetic nerve tissues. Macrophage infiltration is invoked in the pathogenesis of diabetic polyneuropathy (DPN), while the association between macrophage and RAGE activation and the downstream effects of macrophages remain to be fully clarified in DPN. This study explored the role of RAGE in the pathogenesis of DPN through the modified macrophages. Infiltrating proinflammatory macrophages impaired insulin sensitivity, atrophied the neurons in dorsal root ganglion, and slowed retrograde axonal transport (RAT) in the sciatic nerve of type 1 diabetic mice. RAGE-null mice showed an increase in the population of antiinflammatory macrophages, accompanied by intact insulin sensitivity, normalized ganglion cells, and RAT. BM transplantation from RAGE-null mice to diabetic mice protected the peripheral nerve deficits, suggesting that RAGE is a major determinant for the polarity of macrophages in DPN. In vitro coculture analyses revealed proinflammatory macrophage-elicited insulin resistance in the primary neuronal cells isolated from dorsal root ganglia. Applying time-lapse recording disclosed a direct impact of proinflammatory macrophage and insulin resistance on the RAT deficits in primary neuronal cultures. These results provide a potentially novel insight into the development of RAGE-related DPN.
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Affiliation(s)
- Sho Osonoi
- Department of Pathology and Molecular Medicine and,Department of Endocrinology and Metabolism, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | | | - Yuki Takeuchi
- Department of Pathology and Molecular Medicine and,Department of Endocrinology and Metabolism, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Hikari Sugawa
- Laboratory of Food and Regulation Biology, Department of Bioscience, School of Agriculture, Tokai University, Higashi-ku, Kumamoto, Japan
| | | | - Shizuka Takaku
- Diabetic Neuropathy Project, Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo, Japan
| | | | | | - Koichi Ito
- Department of Bioscience and Laboratory Medicine, Hirosaki University Graduate School of Health Sciences, Hirosaki, Japan
| | - Kazunori Sango
- Diabetic Neuropathy Project, Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo, Japan
| | - Ryoji Nagai
- Laboratory of Food and Regulation Biology, Department of Bioscience, School of Agriculture, Tokai University, Higashi-ku, Kumamoto, Japan
| | - Yasuhiko Yamamoto
- Department of Biochemistry and Molecular Vascular Biology, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
| | - Makoto Daimon
- Department of Endocrinology and Metabolism, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
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Takaku S, Sango K. Pretreatment with Zonisamide Mitigates Oxaliplatin-Induced Toxicity in Rat DRG Neurons and DRG Neuron–Schwann Cell Co-Cultures. Int J Mol Sci 2022; 23:ijms23179983. [PMID: 36077386 PMCID: PMC9456039 DOI: 10.3390/ijms23179983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 08/25/2022] [Accepted: 08/29/2022] [Indexed: 12/05/2022] Open
Abstract
Oxaliplatin (OHP) is a platinum-based agent that can cause peripheral neuropathy, an adverse effect in which the dorsal root ganglion (DRG) neurons are targeted. Zonisamide has exhibited neuroprotective activities toward adult rat DRG neurons in vitro and therefore, we aimed to assess its potential efficacy against OHP-induced neurotoxicity. Pretreatment with zonisamide (100 μM) alleviated the DRG neuronal death caused by OHP (75 μM) and the protective effects were attenuated by a co-incubation with 25 μM of the mitogen-activated protein kinase (MAPK; MEK/ERK) inhibitor, U0126, or the phosphatidyl inositol-3′-phosphate-kinase (PI3K) inhibitor, LY294002. Pretreatment with zonisamide also suppressed the OHP-induced p38 MAPK phosphorylation in lined DRG neurons, ND7/23, while the OHP-induced DRG neuronal death was alleviated by pretreatment with the p38 MAPK inhibitor, SB239063 (25 μM). Although zonisamide failed to protect the immortalized rat Schwann cells IFRS1 from OHP-induced cell death, it prevented neurite degeneration and demyelination-like changes, as well as the reduction of the serine/threonine-specific protein kinase (AKT) phosphorylation in DRG neuron–IFRS1 co-cultures exposed to OHP. Zonisamide’s neuroprotection against the OHP-induced peripheral sensory neuropathy is possibly mediated by a stimulation of the MEK/ERK and PI3K/AKT signaling pathways and suppression of the p38 MAPK pathway in DRG neurons. Future studies will allow us to solidify zonisamide as a promising remedy against the neurotoxic adverse effects of OHP.
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Affiliation(s)
- Shizuka Takaku
- Correspondence: ; Tel.: +81-3-6834-2359; Fax: +81-5316-3150
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Sango K, Takaku S, Tsukamoto M, Niimi N, Yako H. Glucagon-Like Peptide-1 Receptor Agonists as Potential Myelination-Inducible and Anti-Demyelinating Remedies. Front Cell Dev Biol 2022; 10:950623. [PMID: 35874814 PMCID: PMC9298969 DOI: 10.3389/fcell.2022.950623] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [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: 05/23/2022] [Accepted: 06/16/2022] [Indexed: 02/06/2023] Open
Abstract
Glucagon-like peptide-1 receptor agonists (GLP-1RAs) were developed as insulinotropic and anti-hyperglycemic agents for the treatment of type 2 diabetes, but their neurotrophic and neuroprotective activities have been receiving increasing attention. Myelin plays a key role in the functional maintenance of the central and peripheral nervous systems, and recent in vivo and in vitro studies have shed light on the beneficial effects of GLP-1RAs on the formation and protection of myelin. In this article, we describe the potential efficacy of GLP-1RAs for the induction of axonal regeneration and remyelination following nerve lesions and the prevention and alleviation of demyelinating disorders, particularly multiple sclerosis.
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Affiliation(s)
- Kazunori Sango
- Diabetic Neuropathy Project, Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo, Japan
| | - Shizuka Takaku
- Diabetic Neuropathy Project, Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo, Japan
| | - Masami Tsukamoto
- Diabetic Neuropathy Project, Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo, Japan
| | - Naoko Niimi
- Diabetic Neuropathy Project, Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo, Japan
| | - Hideji Yako
- Diabetic Neuropathy Project, Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo, Japan
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13
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Tatsumi Y, Kato A, Niimi N, Yako H, Himeno T, Kondo M, Tsunekawa S, Kato Y, Kamiya H, Nakamura J, Higai K, Sango K, Kato K. Docosahexaenoic Acid Suppresses Oxidative Stress-Induced Autophagy and Cell Death via the AMPK-Dependent Signaling Pathway in Immortalized Fischer Rat Schwann Cells 1. Int J Mol Sci 2022; 23:ijms23084405. [PMID: 35457223 PMCID: PMC9027959 DOI: 10.3390/ijms23084405] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Revised: 04/05/2022] [Accepted: 04/14/2022] [Indexed: 01/27/2023] Open
Abstract
Autophagy is the process by which intracellular components are degraded by lysosomes. It is also activated by oxidative stress; hence, autophagy is thought to be closely related to oxidative stress, one of the major causes of diabetic neuropathy. We previously reported that docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) induced antioxidant enzymes and protected Schwann cells from oxidative stress. However, the relationship between autophagy and oxidative stress-induced cell death in diabetic neuropathy has not been elucidated. Treatment with tert-butyl hydroperoxide (tBHP) decreased the cell survival rate, as measured by an MTT assay in immortalized Fischer rat Schwann cells 1 (IFRS1). A DHA pretreatment significantly prevented tBHP-induced cytotoxicity. tBHP increased autophagy, which was revealed by the ratio of the initiation markers, AMP-activated protein kinase, and UNC51-like kinase phosphorylation. Conversely, the DHA pretreatment suppressed excessive tBHP-induced autophagy signaling. Autophagosomes induced by tBHP in IFRS1 cells were decreased to control levels by the DHA pretreatment whereas autolysosomes were only partially decreased. These results suggest that DHA attenuated excessive autophagy induced by oxidative stress in Schwann cells and may be useful to prevent or reduce cell death in vitro. However, its potentiality to treat diabetic neuropathy must be validated in in vivo studies.
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Affiliation(s)
- Yasuaki Tatsumi
- Laboratory of Medicine, Aichi Gakuin University School of Pharmacy, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya 464-8650, Japan; (Y.T.); (A.K.)
- Department of Medical Biochemistry, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi 274-8510, Japan;
| | - Ayako Kato
- Laboratory of Medicine, Aichi Gakuin University School of Pharmacy, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya 464-8650, Japan; (Y.T.); (A.K.)
| | - Naoko Niimi
- Diabetic Neuropathy Project, Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya, Tokyo 156-8506, Japan; (N.N.); (H.Y.); (K.S.)
| | - Hideji Yako
- Diabetic Neuropathy Project, Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya, Tokyo 156-8506, Japan; (N.N.); (H.Y.); (K.S.)
| | - Tatsuhito Himeno
- Division of Diabetes, Department of Internal Medicine, Aichi Medical University School of Medicine, 1-1 Yazakokarimate, Nagakute 480-1195, Japan; (T.H.); (M.K.); (S.T.); (Y.K.); (H.K.); (J.N.)
| | - Masaki Kondo
- Division of Diabetes, Department of Internal Medicine, Aichi Medical University School of Medicine, 1-1 Yazakokarimate, Nagakute 480-1195, Japan; (T.H.); (M.K.); (S.T.); (Y.K.); (H.K.); (J.N.)
| | - Shin Tsunekawa
- Division of Diabetes, Department of Internal Medicine, Aichi Medical University School of Medicine, 1-1 Yazakokarimate, Nagakute 480-1195, Japan; (T.H.); (M.K.); (S.T.); (Y.K.); (H.K.); (J.N.)
| | - Yoshiro Kato
- Division of Diabetes, Department of Internal Medicine, Aichi Medical University School of Medicine, 1-1 Yazakokarimate, Nagakute 480-1195, Japan; (T.H.); (M.K.); (S.T.); (Y.K.); (H.K.); (J.N.)
| | - Hideki Kamiya
- Division of Diabetes, Department of Internal Medicine, Aichi Medical University School of Medicine, 1-1 Yazakokarimate, Nagakute 480-1195, Japan; (T.H.); (M.K.); (S.T.); (Y.K.); (H.K.); (J.N.)
| | - Jiro Nakamura
- Division of Diabetes, Department of Internal Medicine, Aichi Medical University School of Medicine, 1-1 Yazakokarimate, Nagakute 480-1195, Japan; (T.H.); (M.K.); (S.T.); (Y.K.); (H.K.); (J.N.)
| | - Koji Higai
- Department of Medical Biochemistry, Faculty of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi 274-8510, Japan;
| | - Kazunori Sango
- Diabetic Neuropathy Project, Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya, Tokyo 156-8506, Japan; (N.N.); (H.Y.); (K.S.)
| | - Koichi Kato
- Laboratory of Medicine, Aichi Gakuin University School of Pharmacy, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya 464-8650, Japan; (Y.T.); (A.K.)
- Correspondence: ; Tel.: +81-52-757-6778
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14
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Memezawa S, Sato T, Ochiai A, Fukawa M, Sawaguchi S, Sango K, Miyamoto Y, Yamauchi J. The Antiepileptic Valproic Acid Ameliorates Charcot-Marie-Tooth 2W (CMT2W) Disease-Associated HARS1 Mutation-Induced Inhibition of Neuronal Cell Morphological Differentiation Through c-Jun N-terminal Kinase. Neurochem Res 2022; 47:2684-2702. [PMID: 35380399 DOI: 10.1007/s11064-022-03587-z] [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] [Received: 12/11/2021] [Revised: 02/20/2022] [Accepted: 03/20/2022] [Indexed: 11/30/2022]
Abstract
Hereditary peripheral neuropathies called Charcot-Marie-Tooth (CMT) disease affect the sensory nerves as well as motor neurons. CMT diseases are composed of a heterogeneous group of diseases. They are characterized by symptoms such as muscle weakness and wasting. Type 2 CMT (CMT2) disease is a neuropathy with blunted or disrupted neuronal morphological differentiation phenotypes including process formation of peripheral neuronal axons. In the early stages of CMT2, demyelination that occurs in Schwann cells (glial cells) is rarely observed. CMT2W is an autosomal-dominant disease and is responsible for the gene encoding histidyl-tRNA synthetase 1 (HARS1), which is a family molecule of cytoplasmic aminoacyl-tRNA synthetases and functions by ligating histidine to its cognate tRNA. Despite increasing knowledge of the relationship of mutations on responsible genes with diseases, it still remains unclear how each mutation affects neuronal differentiation. Here we show that in neuronal N1E-115 cells, a severe Asp364-to-Tyr (D364Y) mutation of HARS1 leads to formation of small aggregates of HARS1 proteins; in contrast, wild type proteins are distributed throughout cell bodies. Expression of D364Y mutant proteins inhibited process formation whereas expression of wild type proteins possessed the normal differentiation ability to grow processes. Pretreatment with the antiepileptic valproic acid recovered inhibition of process formation by D364Y mutant proteins through the c-Jun N-terminal kinase signaling pathway. Taken together, these results indicate that the D364Y mutation of HARS1 causes HARS1 proteins to form small aggregates, inhibiting process growth, and that these effects are recovered by valproic acid. This could be a potential therapeutic drug for CMT2W at the cellular levels.
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Affiliation(s)
- Shiori Memezawa
- Laboratory of Molecular Neuroscience and Neurology, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan
| | - Takanari Sato
- Laboratory of Molecular Neuroscience and Neurology, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan
| | - Arisa Ochiai
- Laboratory of Molecular Neuroscience and Neurology, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan
| | - Miku Fukawa
- Laboratory of Molecular Neuroscience and Neurology, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan
| | - Sui Sawaguchi
- Laboratory of Molecular Neuroscience and Neurology, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan
| | - Kazunori Sango
- Diabetic Neuropathy Project, Tokyo Metropolitan Institute of Medical Science, Setagaya, Tokyo, 156-8506, Japan
| | - Yuki Miyamoto
- Laboratory of Molecular Neuroscience and Neurology, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan
| | - Junji Yamauchi
- Laboratory of Molecular Neuroscience and Neurology, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan. .,Department of Pharmacology, National Research Institute for Child Health and Development, Setagaya, Tokyo, 157-8535, Japan.
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15
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Suzuki M, Sango K, Nagai Y. Roles of α-Synuclein and Disease-Associated Factors in Drosophila Models of Parkinson's Disease. Int J Mol Sci 2022; 23:ijms23031519. [PMID: 35163450 PMCID: PMC8835920 DOI: 10.3390/ijms23031519] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 01/24/2022] [Accepted: 01/26/2022] [Indexed: 02/04/2023] Open
Abstract
α-Synuclein (αSyn) plays a major role in the pathogenesis of Parkinson’s disease (PD), which is the second most common neurodegenerative disease after Alzheimer’s disease. The accumulation of αSyn is a pathological hallmark of PD, and mutations in the SNCA gene encoding αSyn cause familial forms of PD. Moreover, the ectopic expression of αSyn has been demonstrated to mimic several key aspects of PD in experimental model systems. Among the various model systems, Drosophila melanogaster has several advantages for modeling human neurodegenerative diseases. Drosophila has a well-defined nervous system, and numerous tools have been established for its genetic analyses. The rapid generation cycle and short lifespan of Drosophila renders them suitable for high-throughput analyses. PD model flies expressing αSyn have contributed to our understanding of the roles of various disease-associated factors, including genetic and nongenetic factors, in the pathogenesis of PD. In this review, we summarize the molecular pathomechanisms revealed to date using αSyn-expressing Drosophila models of PD, and discuss the possibilities of using these models to demonstrate the biological significance of disease-associated factors.
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Affiliation(s)
- Mari Suzuki
- Diabetic Neuropathy Project, Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, Setagaya, Tokyo 156-8506, Japan;
- Department of Neurotherapeutics, Graduate School of Medicine, Osaka University, Suita 565-0871, Japan
- Correspondence: (M.S.); (Y.N.); Tel.: +81-5316-3100 (M.S.); +81-72-366-0221 (Y.N.)
| | - Kazunori Sango
- Diabetic Neuropathy Project, Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, Setagaya, Tokyo 156-8506, Japan;
| | - Yoshitaka Nagai
- Department of Neurotherapeutics, Graduate School of Medicine, Osaka University, Suita 565-0871, Japan
- Department of Neurology, Faculty of Medicine, Kindai University, Osaka-Sayama 589-8511, Japan
- Correspondence: (M.S.); (Y.N.); Tel.: +81-5316-3100 (M.S.); +81-72-366-0221 (Y.N.)
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16
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Ali H, Morito K, Hasi RY, Aihara M, Hayashi J, Kawakami R, Kanemaru K, Tsuchiya K, Sango K, Tanaka T. Characterization of uptake and metabolism of very long-chain fatty acids in peroxisome-deficient CHO cells. Biochim Biophys Acta Mol Cell Biol Lipids 2021; 1867:159088. [PMID: 34848380 DOI: 10.1016/j.bbalip.2021.159088] [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] [Received: 08/21/2021] [Revised: 10/29/2021] [Accepted: 11/21/2021] [Indexed: 11/24/2022]
Abstract
Fatty acids (FAs) longer than C20 are classified as very long-chain fatty acids (VLCFAs). Although biosynthesis and degradation of VLCFAs are important for the development and integrity of the myelin sheath, knowledge on the incorporation of extracellular VLCFAs into the cells is limited due to the experimental difficulty of solubilizing them. In this study, we found that a small amount of isopropanol solubilized VLCFAs in aqueous medium by facilitating the formation of the VLCFA/albumin complex. Using this solubilizing technique, we examined the role of the peroxisome in the uptake and metabolism of VLCFAs in Chinese hamster ovary (CHO) cells. When wild-type CHO cells were incubated with saturated VLCFAs (S-VLCFAs), such as C23:0 FA, C24:0 FA, and C26:0 FA, extensive uptake was observed. Most of the incorporated S-VLCFAs were oxidatively degraded without acylation into cellular lipids. In contrast, in peroxisome-deficient CHO cells uptake of S-VLCFAs was marginal and oxidative metabolism was not observed. Extensive uptake and acylation of monounsaturated (MU)-VLCFAs, such as C24:1 FA and C22:1 FA, were observed in both types of CHO cells. However, oxidative metabolism was evident only in wild-type cells. Similar manners of uptake and metabolism of S-VLCFAs and MU-VLCFAs were observed in IFRS1, a Schwan cell-derived cell line. These results indicate that peroxisome-deficient cells limit intracellular S-VLCFAs at a low level by halting uptake, and as a result, peroxisome-deficient cells almost completely lose the clearance ability of S-VLCFAs accumulated outside of the cells.
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Affiliation(s)
- Hanif Ali
- Graduate School of Biomedical Sciences, Tokushima University, Tokushima 770-8505, Japan
| | - Katsuya Morito
- Graduate School of Biomedical Sciences, Tokushima University, Tokushima 770-8505, Japan
| | - Rumana Yesmin Hasi
- Graduate School of Technology, Industrial and Social Sciences, Tokushima University, Tokushima 770-8502, Japan
| | - Mutsumi Aihara
- Graduate School of Technology, Industrial and Social Sciences, Tokushima University, Tokushima 770-8502, Japan
| | - Junji Hayashi
- Graduate School of Technology, Industrial and Social Sciences, Tokushima University, Tokushima 770-8502, Japan
| | - Ryushi Kawakami
- Graduate School of Technology, Industrial and Social Sciences, Tokushima University, Tokushima 770-8502, Japan
| | - Kaori Kanemaru
- Graduate School of Technology, Industrial and Social Sciences, Tokushima University, Tokushima 770-8502, Japan
| | - Koichiro Tsuchiya
- Graduate School of Biomedical Sciences, Tokushima University, Tokushima 770-8505, Japan
| | - Kazunori Sango
- Diabetic Neuropathy Project, Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, Tokyo 156-8506, Japan
| | - Tamotsu Tanaka
- Graduate School of Technology, Industrial and Social Sciences, Tokushima University, Tokushima 770-8502, Japan.
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Yako H, Niimi N, Kato A, Takaku S, Tatsumi Y, Nishito Y, Kato K, Sango K. Role of pyruvate in maintaining cell viability and energy production under high-glucose conditions. Sci Rep 2021; 11:18910. [PMID: 34556698 PMCID: PMC8460646 DOI: 10.1038/s41598-021-98082-w] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Accepted: 09/03/2021] [Indexed: 11/25/2022] Open
Abstract
Pyruvate functions as a key molecule in energy production and as an antioxidant. The efficacy of pyruvate supplementation in diabetic retinopathy and nephropathy has been shown in animal models; however, its significance in the functional maintenance of neurons and Schwann cells under diabetic conditions remains unknown. We observed rapid and extensive cell death under high-glucose (> 10 mM) and pyruvate-starved conditions. Exposure of Schwann cells to these conditions led to a significant decrease in glycolytic flux, mitochondrial respiration and ATP production, accompanied by enhanced collateral glycolysis pathways (e.g., polyol pathway). Cell death could be prevented by supplementation with 2-oxoglutarate (a TCA cycle intermediate), benfotiamine (the vitamin B1 derivative that suppresses the collateral pathways), or the poly (ADP-ribose) polymerase (PARP) inhibitor, rucaparib. Our findings suggest that exogenous pyruvate plays a pivotal role in maintaining glycolysis–TCA cycle flux and ATP production under high-glucose conditions by suppressing PARP activity.
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Affiliation(s)
- Hideji Yako
- Diabetic Neuropathy Project, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo, 156-8506, Japan.
| | - Naoko Niimi
- Diabetic Neuropathy Project, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo, 156-8506, Japan
| | - Ayako Kato
- Laboratory of Medicine, Aichi Gakuin University, School of Pharmacy, Nagoya, Japan
| | - Shizuka Takaku
- Diabetic Neuropathy Project, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo, 156-8506, Japan
| | - Yasuaki Tatsumi
- Laboratory of Medicine, Aichi Gakuin University, School of Pharmacy, Nagoya, Japan
| | - Yasumasa Nishito
- Basic Technology Research Center, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan
| | - Koichi Kato
- Laboratory of Medicine, Aichi Gakuin University, School of Pharmacy, Nagoya, Japan
| | - Kazunori Sango
- Diabetic Neuropathy Project, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo, 156-8506, Japan.
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18
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Oba M, Fukui K, Sango K, Suzuki M. Dataset on the effect of Rubicon overexpression on polyglutamine-induced locomotor dysfunction in Drosophila. Data Brief 2021; 37:107222. [PMID: 34189208 PMCID: PMC8220321 DOI: 10.1016/j.dib.2021.107222] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Accepted: 06/10/2021] [Indexed: 11/26/2022] Open
Abstract
The accumulation of pathogenic misfolded proteins is believed to be a common mechanism of generation of neurodegenerative diseases, such as Alzheimer's disease, Parkinson's disease, and polyglutamine (polyQ) diseases. The autophagy–lysosome degradation system has been considered as a potential therapeutic target against these disorders, as it is able to degrade large protein aggregates. Previously, we focused on Rubicon, a negative regulator of autophagy, and demonstrated that knockdown of the Drosophila homolog of Rubicon (dRubicon) suppressed locomotor dysfunction in a fly model of polyQ disease. This suppression was associated with increased autophagic activity and a marked reduction in the number of polyQ inclusion bodies [1]. We generated transgenic fly lines expressing hemagglutinin-tagged dRubicon wild-type (WT) or dRubicon in which the RUN [after RPIP8 (RaP2 interacting protein 8), UNC-14 and NESCA (new molecule containing SH3 at the carboxyl-terminus)] domain was deleted (ΔRUN). We provide data regarding the effect of WT and ΔRUN dRubicon co-expression on polyQ-induced locomotor dysfunction in Drosophila.
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Affiliation(s)
- Masaki Oba
- Diabetic Neuropathy Project, Department of Diseases & Infection, Tokyo Metropolitan Institute of Medical Science, Setagaya, Tokyo 156-8506, Japan.,Department of Functional Control Systems, Molecular Cell Biology Laboratory, Graduate School of Engineering and Science, Shibaura Institute of Technology, Saitama 337-8570, Japan
| | - Koji Fukui
- Department of Functional Control Systems, Molecular Cell Biology Laboratory, Graduate School of Engineering and Science, Shibaura Institute of Technology, Saitama 337-8570, Japan
| | - Kazunori Sango
- Diabetic Neuropathy Project, Department of Diseases & Infection, Tokyo Metropolitan Institute of Medical Science, Setagaya, Tokyo 156-8506, Japan
| | - Mari Suzuki
- Diabetic Neuropathy Project, Department of Diseases & Infection, Tokyo Metropolitan Institute of Medical Science, Setagaya, Tokyo 156-8506, Japan
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19
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Saiki T, Nakamura N, Miyabe M, Ito M, Minato T, Sango K, Matsubara T, Naruse K. The Effects of Insulin on Immortalized Rat Schwann Cells, IFRS1. Int J Mol Sci 2021; 22:ijms22115505. [PMID: 34071138 PMCID: PMC8197103 DOI: 10.3390/ijms22115505] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2021] [Revised: 05/18/2021] [Accepted: 05/19/2021] [Indexed: 01/02/2023] Open
Abstract
Schwann cells play an important role in peripheral nerve function, and their dysfunction has been implicated in the pathogenesis of diabetic neuropathy and other demyelinating diseases. The physiological functions of insulin in Schwann cells remain unclear and therefore define the aim of this study. By using immortalized adult Fischer rat Schwann cells (IFRS1), we investigated the mechanism of the stimulating effects of insulin on the cell proliferation and expression of myelin proteins (myelin protein zero (MPZ) and myelin basic protein (MBP). The application of insulin to IFRS1 cells increased the proliferative activity and induced phosphorylation of Akt and ERK, but not P38-MAPK. The proliferative potential of insulin-stimulated IFRS1 was significantly suppressed by the addition of LY294002, a PI3 kinase inhibitor. The insulin-stimulated increase in MPZ expression was significantly suppressed by the addition of PD98059, a MEK inhibitor. Furthermore, insulin-increased MBP expression was significantly suppressed by the addition of LY294002. These findings suggest that both PI3-K/Akt and ERK/MEK pathways are involved in insulin-induced cell growth and upregulation of MPZ and MBP in IFRS1 Schwann cells.
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Affiliation(s)
- Tomokazu Saiki
- Department of Pharmacy, Aichi Gakuin University Dental Hospital, Nagoya 464-8651, Japan;
| | - Nobuhisa Nakamura
- Department of Internal Medicine, School of Dentistry, Aichi Gakuin University, Nagoya 464-8651, Japan; (M.M.); (M.I.); (T.M.); (K.N.)
- Correspondence: ; Tel.: +81-52-759-2111; Fax: +81-52-759-2168
| | - Megumi Miyabe
- Department of Internal Medicine, School of Dentistry, Aichi Gakuin University, Nagoya 464-8651, Japan; (M.M.); (M.I.); (T.M.); (K.N.)
| | - Mizuho Ito
- Department of Internal Medicine, School of Dentistry, Aichi Gakuin University, Nagoya 464-8651, Japan; (M.M.); (M.I.); (T.M.); (K.N.)
| | - Tomomi Minato
- Department of Clinical Laboratory, Aichi Gakuin University Dental Hospital, Nagoya 464-8651, Japan;
| | - Kazunori Sango
- Diabetic Neuropathy Project, Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, Tokyo 156-8506, Japan;
| | - Tatsuaki Matsubara
- Department of Internal Medicine, School of Dentistry, Aichi Gakuin University, Nagoya 464-8651, Japan; (M.M.); (M.I.); (T.M.); (K.N.)
| | - Keiko Naruse
- Department of Internal Medicine, School of Dentistry, Aichi Gakuin University, Nagoya 464-8651, Japan; (M.M.); (M.I.); (T.M.); (K.N.)
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20
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Mizukami H, Osonoi S, Takaku S, Yamagishi SI, Ogasawara S, Sango K, Chung S, Yagihashi S. Role of glucosamine in development of diabetic neuropathy independent of the aldose reductase pathway. Brain Commun 2020; 2:fcaa168. [PMID: 33305258 PMCID: PMC7713992 DOI: 10.1093/braincomms/fcaa168] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [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: 12/13/2019] [Revised: 08/04/2020] [Accepted: 08/24/2020] [Indexed: 12/30/2022] Open
Abstract
Long-term metabolic aberrations contribute to the development of diabetic neuropathy but the precise mechanism or mechanisms remains elusive. We have previously shown that aldose reductase-deficient mice exhibit delayed onset and progression of neuropathy following induction of diabetes, suggesting a role both for downstream metabolites of this enzyme and also for other unrelated pathways. In this study, we have utilized comprehensive metabolomics analyses to identify potential neurotoxic metabolites in nerve of diabetic mice and explored the mechanism of peripheral nerve injury. Aldose reductase knockout and control C57Bl/6J mice were made diabetic by injection of streptozotocin and followed for 8–16 weeks. Diabetic aldose reductase knockout mice exhibited delayed onset of nerve conduction slowing compared to diabetic wild-type mice. The sciatic nerves from aldose reductase knockout mice exposed to 12 weeks of diabetes were used for metabolomics analysis and compared with analyses of nerves from age-matched diabetic wild-type mice as well as non-diabetic aldose reductase knockout and wild-type mice. Neurotoxicity of candidate metabolites was evaluated using cultured Schwann cells and dorsal root ganglion neurons, and further confirmed in vivo. Metabolomics analysis identified elevated glucosamine levels in both diabetic aldose reductase knockout and diabetic wild mice. Exposure to glucosamine reduced survival of cultured Schwann cells and neurons accompanied by increased expression of cleaved caspase 3, CCAT-enhancer-binding homologous protein and mitochondrial hexokinase-I, along with ATP depletion. These changes were suppressed by siRNA to hexokinase-I or the ATP donor, inosine, but not by the antioxidant N-acetylcysteine or the endoplasmic reticulum-stress inhibitor 4-phenylbutyrate. The O-GlcNAcylation enhancer, O-(2-acetamido-2-deoxy-d-glucopyranosylidene) amino N-phenylcarbamate, did not augment glucosamine neurotoxicity. Single dose glucosamine injection into mice caused a reduction of sciatic nerve Na, K-ATPase activity, ATP content and augmented expression of hexokinase-I, which were suppressed by pretreatment with inosine but not with 4-phenylbutyrate. Mice implanted with a subcutaneous pump to infuse glucosamine for 12 weeks developed nerve conduction slowing and intraepidermal nerve fibre loss, recapitulating prominent indices of diabetic neuropathy. While acute glucosamine neurotoxicity is unlikely to contribute substantially to the slowly developing neuropathy phenotype in humans, sustained energy deprivation induced by glucosamine may well contribute to the pathogenesis of diabetic neuropathy. Our data thus identifies a novel pathway for diabetic neuropathy that may offer a potential new therapeutic target.
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Affiliation(s)
- Hiroki Mizukami
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Sho Osonoi
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Shizuka Takaku
- Diabetic Neuropathy Project, Tokyo Metropolitan Institute of Medical Science, Tokyo
| | - Shin-Ichiro Yamagishi
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Saori Ogasawara
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Kazunori Sango
- Diabetic Neuropathy Project, Tokyo Metropolitan Institute of Medical Science, Tokyo
| | - Sookja Chung
- Faculty of Medicine, Macau University of Science and Technology, Taipa, Macau
| | - Soroku Yagihashi
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
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21
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Murakami T, Yokoyama T, Mizuguchi M, Toné S, Takaku S, Sango K, Nishimura H, Watabe K, Sunada Y. A low amyloidogenic E61K transthyretin mutation may cause familial amyloid polyneuropathy. J Neurochem 2020; 156:957-966. [PMID: 32852783 DOI: 10.1111/jnc.15162] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2020] [Revised: 04/09/2020] [Accepted: 08/14/2020] [Indexed: 12/01/2022]
Abstract
Patients with transthyretin (TTR)-type familial amyloid polyneuropathy (FAP) typically exhibit sensory dominant polyneuropathy and autonomic neuropathy. However, the molecular pathogenesis of the neuropathy remains unclear. In this study, we characterize the features of FAP TTR the substitution of lysine for glutamic acid at position 61 (E61K). This FAP was late-onset, with sensory dominant polyneuropathy, autonomic neuropathy, and cardiac amyloidosis. Interestingly, no amyloid deposits were found in the endoneurium of the four nerve specimens examined. Therefore, we examined the amyloidogenic properties of E61K TTR in vitro. Recombinant wild-type TTR, the substitution of methionine for valine at position 30 (V30M) TTR, and E61K TTR proteins were incubated at 37°C for 72 hr, and amyloid fibril formation was assessed using the thioflavin-T binding assay. Amyloid fibril formation by E61K TTR was less than that by V30M TTR, and similar to that by wild-type TTR. E61K TTR did not have an inhibitory effect on neurite outgrowth from adult rat dorsal root ganglion (DRG) neurons, but V30M TTR did. Furthermore, we studied the sural nerve of our patient by terminal deoxynucleotidyl transferase dUTP nick end labeling and electron microscopy. A number of apoptotic cells were observed in the endoneurium of the nerve by transferase dUTP nick end labeling. Chromatin condensation was confirmed in the nucleus of non-myelinating Schwann cells by electron microscopy. These findings suggest that E61K TTR is low amyloidogenic, in vitro and in vivo. However, TTR aggregates and amyloid fibrils in the DRG may cause sensory impairments in FAP because the DRG has no blood-nerve barrier. Moreover, Schwann cell apoptosis may contribute to the neurodegeneration.
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Affiliation(s)
| | - Takeshi Yokoyama
- Faculty of Pharmaceutical Sciences, University of Toyama, Toyama, Japan
| | | | - Shigenobu Toné
- Graduate School of Science and Engineering, Tokyo Denki University, Hatoyama, Saitama, Japan
| | - Shizuka Takaku
- Diabetic Neuropathy Project, Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan
| | - Kazunori Sango
- Diabetic Neuropathy Project, Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan
| | | | - Kazuhiko Watabe
- Department of Medical Technology, Faculty of Health Sciences, Kyorin University, Tokyo, Japan
| | - Yoshihide Sunada
- Department of Neurology, Kawasaki Medical School, Kurashiki, Japan
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22
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Takaku S, Sango K. Zonisamide enhances neurite outgrowth from adult rat dorsal root ganglion neurons, but not proliferation or migration of Schwann cells. Histochem Cell Biol 2019; 153:177-184. [PMID: 31879799 PMCID: PMC7060162 DOI: 10.1007/s00418-019-01839-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [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] [Accepted: 12/16/2019] [Indexed: 01/06/2023]
Abstract
Zonisamide, an anti-epileptic and anti-Parkinson’s disease drug, displays neurotrophic activity on cultured motor neurons and facilitates axonal regeneration after peripheral nerve injury in mice, but its underlying mechanisms remain unclear. In this study, zonisamide enhanced neurite outgrowth from cultured adult rat dorsal root ganglion (DRG) neurons in a concentration-dependent manner (1 μM < 10 μM < 100 μM), and its activity was significantly attenuated by co-treatment with a phosphatidyl inositol-3′-phosphate-kinase (PI3K) inhibitor LY294002 or a mitogen-activated protein kinase (MAPK) inhibitor U0126. In agreement with these findings, 100 μM zonisamide for 1 h induced phosphorylation of AKT and ERK1/2, key molecules of PI3K and MAPK signaling pathways, respectively in mouse neuroblastoma × rat DRG neuron hybrid cells ND7/23. In contrast, zonisamide failed to promote proliferation or migration of immortalized Fischer rat Schwann cells 1 (IFRS1). These findings suggest that the beneficial effects of zonisamide on peripheral nerve regeneration may be attributable to its direct actions on neurons through PI3K and MAPK pathways, rather than the stimulation of Schwann cells.
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Affiliation(s)
- Shizuka Takaku
- Diabetic Neuropathy Project, Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo, 156-8506, Japan
| | - Kazunori Sango
- Diabetic Neuropathy Project, Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo, 156-8506, Japan.
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Makino E, Nakamura N, Miyabe M, Ito M, Kanada S, Hata M, Saiki T, Sango K, Kamiya H, Nakamura J, Miyazawa K, Goto S, Matsubara T, Naruse K. Conditioned media from dental pulp stem cells improved diabetic polyneuropathy through anti-inflammatory, neuroprotective and angiogenic actions: Cell-free regenerative medicine for diabetic polyneuropathy. J Diabetes Investig 2019; 10:1199-1208. [PMID: 30892819 PMCID: PMC6717901 DOI: 10.1111/jdi.13045] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Revised: 02/19/2019] [Accepted: 03/10/2019] [Indexed: 12/11/2022] Open
Abstract
AIMS/INTRODUCTION Dental pulp stem cells (DPSCs) can be easily obtained from teeth for general orthodontic reasons. We have previously reported the therapeutic effects of DPSC transplantation for diabetic polyneuropathy. As abundant secretomes from DPSCs are considered to play a central role in the improvement of diabetic polyneuropathy, we investigated whether direct injection of DPSC-conditioned media (DPSC-CM) into hindlimb skeletal muscles ameliorates diabetic polyneuropathy in diabetic rats. MATERIALS AND METHODS DPSCs were isolated from the dental pulp of Sprague-Dawley rats. Eight weeks after the induction of diabetes, DPSC-CM was injected into the unilateral hindlimb skeletal muscles in both normal and diabetic rats. The effects of DPSC-CM on diabetic polyneuropathy were assessed 4 weeks after DPSC-CM injection. To confirm the angiogenic effect of DPSC-CM, the effect of DPSC-CM on cultured human umbilical vascular endothelial cell proliferation was investigated. RESULTS The administration of DPSC-CM into the hindlimb skeletal muscles significantly ameliorated sciatic motor/sensory nerve conduction velocity, sciatic nerve blood flow and intraepidermal nerve fiber density in the footpads of diabetic rats. We also showed that DPSC-CM injection significantly increased the capillary density of the skeletal muscles, and suppressed pro-inflammatory reactions in the sciatic nerves of diabetic rats. Furthermore, an in vitro study showed that DPSC-CM significantly increased the proliferation of umbilical vascular endothelial cells. CONCLUSIONS We showed that DPSC-CM injection into hindlimb skeletal muscles has a therapeutic effect on diabetic polyneuropathy through neuroprotective, angiogenic and anti-inflammatory actions. DPSC-CM could be a novel cell-free regenerative medicine treatment for diabetic polyneuropathy.
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Affiliation(s)
- Eriko Makino
- Department of OrthodonticsSchool of DentistryAichi Gakuin UniversityNagoyaJapan
| | - Nobuhisa Nakamura
- Department of Internal MedicineSchool of DentistryAichi Gakuin UniversityNagoyaJapan
| | - Megumi Miyabe
- Department of Internal MedicineSchool of DentistryAichi Gakuin UniversityNagoyaJapan
| | - Mizuho Ito
- Department of Internal MedicineSchool of DentistryAichi Gakuin UniversityNagoyaJapan
| | - Saki Kanada
- Department of OrthodonticsSchool of DentistryAichi Gakuin UniversityNagoyaJapan
| | - Masaki Hata
- Department of Removable ProsthodonticsSchool of DentistryAichi Gakuin UniversityNagoyaJapan
| | - Tomokazu Saiki
- Department of PharmacyDental HospitalAichi Gakuin UniversityNagoyaJapan
| | - Kazunori Sango
- Laboratory of Peripheral Nerve PathophysiologyTokyo Metropolitan Institute of Medical ScienceTokyoJapan
| | - Hideki Kamiya
- Division of DiabetesDepartment of Internal MedicineAichi Medical UniversityNagakuteJapan
| | - Jiro Nakamura
- Division of DiabetesDepartment of Internal MedicineAichi Medical UniversityNagakuteJapan
| | - Ken Miyazawa
- Department of OrthodonticsSchool of DentistryAichi Gakuin UniversityNagoyaJapan
| | - Shigemi Goto
- Department of OrthodonticsSchool of DentistryAichi Gakuin UniversityNagoyaJapan
| | - Tatsuaki Matsubara
- Department of Internal MedicineSchool of DentistryAichi Gakuin UniversityNagoyaJapan
| | - Keiko Naruse
- Department of Internal MedicineSchool of DentistryAichi Gakuin UniversityNagoyaJapan
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Tatsumi Y, Kato A, Sango K, Himeno T, Kondo M, Kato Y, Kamiya H, Nakamura J, Kato K. Omega-3 polyunsaturated fatty acids exert anti-oxidant effects through the nuclear factor (erythroid-derived 2)-related factor 2 pathway in immortalized mouse Schwann cells. J Diabetes Investig 2019; 10:602-612. [PMID: 30216708 PMCID: PMC6497605 DOI: 10.1111/jdi.12931] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Revised: 08/09/2018] [Accepted: 09/09/2018] [Indexed: 12/14/2022] Open
Abstract
AIMS/INTRODUCTION Recent studies advocate that omega-3 polyunsaturated fatty acids (ω-3 PUFAs) have direct anti-oxidative and anti-inflammatory effects in the vasculature; however, the role of ω-3 PUFAs in Schwann cells remains undetermined. MATERIALS AND METHODS Immortalized mouse Schwann (IMS32) cells were incubated with the ω-3 PUFAs docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA). The messenger ribonucleic acid levels of several anti-oxidant enzymes (heme oxygenase-1 [Ho-1], nicotinamide adenine dinucleotide [phosphate] H quinone oxidoreductase 1, catalase, superoxide dismutase and glutathione peroxidase) were identified using real-time reverse transcription polymerase chain reaction. Ho-1 and nicotinamide adenine dinucleotide [phosphate] H quinone oxidoreductase 1 protein levels were evaluated using Western blotting. Nuclear factor (erythroid-derived 2)-related factor 2 (Nrf2) of the nuclear fraction was also quantified using western blotting. Catalase activity and glutathione content were determined by colorimetric assay kits. Nrf2 promoter-luciferase activity was evaluated by a dual luciferase assay system. RESULTS Treatment with tert-butyl hydroperoxide decreased cell viability dose-dependently. DHA or EPA pretreatment significantly alleviated tert-butyl hydroperoxide-induced cytotoxicity. DHA or EPA increased the messenger ribonucleic acid levels of Ho-1, nicotinamide adenine dinucleotide (phosphate) H quinone oxidoreductase 1 and catalase dose-dependently. Ho-1 protein level, catalase activity, Nrf2 promoter-luciferase activity and intracellular glutathione content were significantly increased by DHA and EPA. CONCLUSIONS These findings show that DHA and EPA can induce Ho-1 and catalase through Nrf2, thus protecting Schwann cells against oxidative stress. ω-3 PUFAs appear to exert their neuroprotective effect by increasing defense mechanisms against oxidative stress in diabetic neuropathies.
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Affiliation(s)
- Yasuaki Tatsumi
- Laboratory of MedicineAichi Gakuin University School of PharmacyNagoyaAichiJapan
| | - Ayako Kato
- Laboratory of MedicineAichi Gakuin University School of PharmacyNagoyaAichiJapan
| | - Kazunori Sango
- Diabetic Neuropathy ProjectDepartment of Sensory and Motor SystemsTokyo Metropolitan Institute of Medical ScienceTokyoJapan
| | - Tatsuhito Himeno
- Department of Internal MedicineDivision of DiabetesAichi Medical University School of MedicineNagakuteAichiJapan
| | - Masaki Kondo
- Department of Internal MedicineDivision of DiabetesAichi Medical University School of MedicineNagakuteAichiJapan
| | - Yoshiro Kato
- Department of Internal MedicineDivision of DiabetesAichi Medical University School of MedicineNagakuteAichiJapan
| | - Hideki Kamiya
- Department of Internal MedicineDivision of DiabetesAichi Medical University School of MedicineNagakuteAichiJapan
| | - Jiro Nakamura
- Department of Internal MedicineDivision of DiabetesAichi Medical University School of MedicineNagakuteAichiJapan
| | - Koichi Kato
- Laboratory of MedicineAichi Gakuin University School of PharmacyNagoyaAichiJapan
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Kato A, Tatsumi Y, Yako H, Sango K, Himeno T, Kondo M, Kato Y, Kamiya H, Nakamura J, Kato K. Recurrent short-term hypoglycemia and hyperglycemia induce apoptosis and oxidative stress via the ER stress response in immortalized adult mouse Schwann (IMS32) cells. Neurosci Res 2018; 147:26-32. [PMID: 30444976 DOI: 10.1016/j.neures.2018.11.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 10/02/2018] [Accepted: 11/12/2018] [Indexed: 12/21/2022]
Abstract
Hypoglycemia and fluctuating high or low glucose conditions are under-appreciated sources of oxidative stress contributing to diabetic neuropathy. We investigated the effects of recurrent short-term hypoglycemia and hyperglycemia, on apoptosis and oxidative stress in Schwann cells. Immortalized adult mouse Schwann (IMS32) cells were exposed to five different glucose treatments over 3 days: 1) normal glucose (NG), 2) constant low glucose (LG), 3) constant high glucose (HG), 4) intermittent low glucose (ILG; 1 h three times per day), 5) intermittent high glucose (IHG; 1 h three times per day). Cell viability was decreased by all treatment variants, in comparison to NG. Thiobarbituric acid reactive substance (TBARS) levels were increased by HG, LG, IHG, and ILG. High glucose (HG and IHG) and low glucose (LG and ILG) increased the expression of cleaved caspase-3 and reduced that of Bcl-2. In addition, endoplasmic reticulum (ER) stress-responsive transcription factor C/EBP homologous protein (CHOP) expression was increased under low and high glucose conditions. Cell death and oxidative stress induced by HG, LG, IHG, and ILG were significantly reduced by 4-phenyl butyric acid (4-PBA), an ER stress inhibitor. These findings indicate that recurrent short-term hypoglycemia and hyperglycemia induce apoptosis and oxidative stress via the ER stress response in Schwann cells.
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Affiliation(s)
- Ayako Kato
- Laboratory of Medicine, Aichi Gakuin University School of Pharmacy, Chikusa-ku, Nagoya, Aichi, 464-8650, Japan
| | - Yasuaki Tatsumi
- Laboratory of Medicine, Aichi Gakuin University School of Pharmacy, Chikusa-ku, Nagoya, Aichi, 464-8650, Japan
| | - Hideji Yako
- Diabetic Neuropathy Project, Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo, 156-8506 Japan
| | - Kazunori Sango
- Diabetic Neuropathy Project, Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo, 156-8506 Japan
| | - Tatsuhito Himeno
- Division of Diabetes, Department of Internal Medicine, Aichi Medical University School of Medicine, Nagakute, Aichi, 480-1195, Japan
| | - Masaki Kondo
- Division of Diabetes, Department of Internal Medicine, Aichi Medical University School of Medicine, Nagakute, Aichi, 480-1195, Japan
| | - Yoshiro Kato
- Division of Diabetes, Department of Internal Medicine, Aichi Medical University School of Medicine, Nagakute, Aichi, 480-1195, Japan
| | - Hideki Kamiya
- Division of Diabetes, Department of Internal Medicine, Aichi Medical University School of Medicine, Nagakute, Aichi, 480-1195, Japan
| | - Jiro Nakamura
- Division of Diabetes, Department of Internal Medicine, Aichi Medical University School of Medicine, Nagakute, Aichi, 480-1195, Japan
| | - Koichi Kato
- Laboratory of Medicine, Aichi Gakuin University School of Pharmacy, Chikusa-ku, Nagoya, Aichi, 464-8650, Japan.
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Tatsumi Y, Matsumoto N, Iibe N, Watanabe N, Torii T, Sango K, Homma K, Miyamoto Y, Sakagami H, Yamauchi J. CMT type 2N disease-associated AARS mutant inhibits neurite growth that can be reversed by valproic acid. Neurosci Res 2018; 139:69-78. [PMID: 30261202 DOI: 10.1016/j.neures.2018.09.016] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Revised: 09/06/2018] [Accepted: 09/17/2018] [Indexed: 12/27/2022]
Abstract
Charcot-Marie-Tooth (CMT) disease is composed of a heterogeneous group of hereditary peripheral neuropathies. The peripheral nervous system primarily comprises two types of cells: neuronal cells and myelinating glial Schwann cells. CMT2 N is an autosomal dominant disease and its responsible gene encodes alanyl-tRNA synthetase (AARS), which is a family of cytoplasmic aminoacyl-tRNA synthetases. CMT2 N is associated with the mutation, including a missense mutation, which is known to decrease the enzymatic activity of AARS, but whether and how its mutation affects AARS localization and neuronal process formation remains to be understood. First, we show that the AARS mutant harboring Asn71-to-Tyr (N71Y) is not localized in cytoplasm. The expression of AARS mutant proteins in COS-7 cells mainly leads to localization into lysosome, whereas the wild type is indeed localized in cytoplasm. Second, in N1E-115 cells as the neuronal cell model, cells expressing the N71Y mutant do not have the ability to grow processes. Third, pretreatment with antiepileptic valproic acid reverses the inhibitory effect of the N71Y mutant on process growth. Taken together, the N71Y mutation of AARS leads to abnormal intracellular localization, inhibiting process growth, yet this inhibition is reversed by valproic acid.
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Affiliation(s)
- Yuriko Tatsumi
- Laboratory of Molecular Neuroscience and Neurology, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, 192-0392, Japan
| | - Naoto Matsumoto
- Laboratory of Molecular Neuroscience and Neurology, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, 192-0392, Japan
| | - Noriko Iibe
- Laboratory of Molecular Neuroscience and Neurology, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, 192-0392, Japan
| | - Natsumi Watanabe
- Laboratory of Molecular Neuroscience and Neurology, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, 192-0392, Japan
| | - Tomohiro Torii
- Department of Neuroscience, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Kazunori Sango
- Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, Setagaya, Tokyo, 156-8506, Japan
| | - Keiichi Homma
- Department of Life Science and Informatics, Maebashi Institute of Technology, Maebashi, Gunma, 371-0816, Japan
| | - Yuki Miyamoto
- Laboratory of Molecular Neuroscience and Neurology, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, 192-0392, Japan; Department of Pharmacology, National Research Institute for Child Health and Development, Setagaya, Tokyo, 157-8535, Japan
| | - Hiroyuki Sakagami
- Department of Anatomy, Kitasato University School of Medicine, Sagamihara, Kanagawa, 252-0734, Japan
| | - Junji Yamauchi
- Laboratory of Molecular Neuroscience and Neurology, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, 192-0392, Japan; Department of Pharmacology, National Research Institute for Child Health and Development, Setagaya, Tokyo, 157-8535, Japan.
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Moriwaki Y, Ohno Y, Ishii T, Takamura Y, Kita Y, Watabe K, Sango K, Tsuji S, Misawa H. SIMPLE binds specifically to PI4P through SIMPLE-like domain and participates in protein trafficking in the trans-Golgi network and/or recycling endosomes. PLoS One 2018; 13:e0199829. [PMID: 29953492 PMCID: PMC6023223 DOI: 10.1371/journal.pone.0199829] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Accepted: 06/14/2018] [Indexed: 01/12/2023] Open
Abstract
Small integral membrane protein of the lysosome/late endosome (SIMPLE) is a 161-amino acid cellular protein that contains a characteristic C-terminal domain known as the SIMPLE-like domain (SLD), which is well conserved among species. Several studies have demonstrated that SIMPLE localizes to the trans-Golgi network (TGN), early endosomes, lysosomes, multivesicular bodies, aggresomes and the plasma membrane. However, the amino acid regions responsible for its subcellular localization have not yet been identified. The SLD resembles the FYVE domain, which binds phosphatidylinositol (3)-phosphate (PI3P) and determines the subcellular localization of FYVE domain-containing proteins. In the present study, we have found that SIMPLE binds specifically to PI4P through its SLD. SIMPLE co-localized with PI4P and Rab11, a marker for recycling endosomes (REs, organelles enriched in PI4P) in both the IMS32 mouse Schwann cell line and Hela cells. Sucrose density-gradient centrifugation revealed that SIMPLE co-fractionated with syntaxin-6 (a TGN marker) and Rab11. We have also found that SIMPLE knockdown impeded recycling of transferrin and of transferrin receptor. Our overall results indicate that SIMPLE may regulate protein trafficking physiologically by localizing to the TGN and/or REs by binding PI4P.
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Affiliation(s)
- Yasuhiro Moriwaki
- Division of Pharmacology, Faculty of Pharmacy, Keio University, Minato-ku, Tokyo, Japan
- * E-mail: (YM); (HM)
| | - Yuho Ohno
- Division of Pharmacology, Faculty of Pharmacy, Keio University, Minato-ku, Tokyo, Japan
| | - Tomohiro Ishii
- Division of Pharmacology, Faculty of Pharmacy, Keio University, Minato-ku, Tokyo, Japan
- Laboratory for Neurodegenerative Pathology, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo, Japan
| | - Yuki Takamura
- Division of Pharmacology, Faculty of Pharmacy, Keio University, Minato-ku, Tokyo, Japan
| | - Yuko Kita
- Division of Pharmacology, Faculty of Pharmacy, Keio University, Minato-ku, Tokyo, Japan
| | - Kazuhiko Watabe
- Laboratory for Neurodegenerative Pathology, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo, Japan
| | - Kazunori Sango
- Diabetic Neuropathy Project, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo, Japan
| | - Shoutaro Tsuji
- Molecular Diagnostics Project, Kanagawa Cancer Center Research Institute, Yokohama, Kanagawa, Japan
| | - Hidemi Misawa
- Division of Pharmacology, Faculty of Pharmacy, Keio University, Minato-ku, Tokyo, Japan
- * E-mail: (YM); (HM)
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Niimi N, Sango K. Potential utility of aldose reductase-deficient Schwann cells IKARS1 for the study of axonal degeneration and regeneration. Neural Regen Res 2018; 13:979-980. [PMID: 29926820 PMCID: PMC6022478 DOI: 10.4103/1673-5374.233436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Affiliation(s)
- Naoko Niimi
- Diabetic Neuropathy Project, Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan
| | - Kazunori Sango
- Diabetic Neuropathy Project, Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan
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29
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Takaku S, Yako H, Niimi N, Akamine T, Kawanami D, Utsunomiya K, Sango K. Establishment of a myelinating co-culture system with a motor neuron-like cell line NSC-34 and an adult rat Schwann cell line IFRS1. Histochem Cell Biol 2018; 149:537-543. [PMID: 29435762 DOI: 10.1007/s00418-018-1649-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/06/2018] [Indexed: 01/01/2023]
Abstract
Co-culture models of neurons and Schwann cells have been utilized for the study of myelination and demyelination in the peripheral nervous system; in most of the previous studies, however, these cells were obtained by primary culture with embryonic or neonatal animals. A spontaneously immortalized Schwann cell line IFRS1 from long-term cultures of adult Fischer rat peripheral nerves has been shown to retain fundamental ability to myelinate neurites in co-cultures with adult rat dorsal root ganglion neurons and nerve growth factor-primed PC12 cells. Our current investigation focuses on the establishment of stable co-culture system with IFRS1 cells and NSC-34 motor neuron-like cells. NSC-34 cells were seeded at a low density (2 × 103/cm2) and maintained for 5-7 days in serum-containing medium supplemented with non-essential amino acids and brain-derived neurotrophic factor (BDNF; 10 ng/mL). Upon observation of neurite outgrowth under a phase-contrast microscope, the NSC-34 cells were exposed to an anti-mitotic agent mitomycin C (1 µg/mL) for 12-16 h, then co-cultured with IFRS1 cells (2 × 104/cm2), and maintained in serum-containing medium supplemented with ascorbic acid (50 µg/mL), BDNF (10 ng/mL), and ciliary neurotrophic factor (10 ng/mL). Double immunofluorescence staining carried out at day 28 of the co-culture showed myelin protein (P0 or PMP22)-immunoreactive IFRS1 cells surrounding the βIII tubulin-immunoreactive neurites. This co-culture system can be a beneficial tool to study the pathogenesis of motor neuron diseases (e.g., amyotrophic lateral sclerosis, Charcot-Marie-Tooth diseases, and immune-mediated demyelinating neuropathies) and novel therapeutic approaches against them.
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Affiliation(s)
- Shizuka Takaku
- Diabetic Neuropathy Project, Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo, 156-8506, Japan
| | - Hideji Yako
- Diabetic Neuropathy Project, Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo, 156-8506, Japan
| | - Naoko Niimi
- Diabetic Neuropathy Project, Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo, 156-8506, Japan
| | - Tomoyo Akamine
- Diabetic Neuropathy Project, Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo, 156-8506, Japan.,Division of Diabetes, Metabolism and Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, Minato-ku, Tokyo, 105-8461, Japan
| | - Daiji Kawanami
- Division of Diabetes, Metabolism and Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, Minato-ku, Tokyo, 105-8461, Japan
| | - Kazunori Utsunomiya
- Division of Diabetes, Metabolism and Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, Minato-ku, Tokyo, 105-8461, Japan
| | - Kazunori Sango
- Diabetic Neuropathy Project, Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo, 156-8506, Japan.
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Niimi N, Yako H, Takaku S, Kato H, Matsumoto T, Nishito Y, Watabe K, Ogasawara S, Mizukami H, Yagihashi S, Chung SK, Sango K. A spontaneously immortalized Schwann cell line from aldose reductase-deficient mice as a useful tool for studying polyol pathway and aldehyde metabolism. J Neurochem 2018; 144:710-722. [DOI: 10.1111/jnc.14277] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Revised: 11/27/2017] [Accepted: 12/03/2017] [Indexed: 01/16/2023]
Affiliation(s)
- Naoko Niimi
- Diabetic Neuropathy Project; Department of Sensory and Motor Systems; Tokyo Metropolitan Institute of Medical Science; Tokyo Japan
| | - Hideji Yako
- Diabetic Neuropathy Project; Department of Sensory and Motor Systems; Tokyo Metropolitan Institute of Medical Science; Tokyo Japan
| | - Shizuka Takaku
- Diabetic Neuropathy Project; Department of Sensory and Motor Systems; Tokyo Metropolitan Institute of Medical Science; Tokyo Japan
| | - Hiroshi Kato
- Sumitomo Dainippon Pharma Co., Ltd.; Osaka Japan
| | | | - Yasumasa Nishito
- Basic Technology Research Center; Tokyo Metropolitan Institute of Medical Science; Tokyo Japan
| | - Kazuhiko Watabe
- Department of Medical Technology; Faculty of Health Sciences; Kyorin University; Tokyo Japan
| | - Saori Ogasawara
- Department of Pathology and Molecular Medicine; Hirosaki University Graduate School of Medicine; Hirosaki Japan
| | - Hiroki Mizukami
- Department of Pathology and Molecular Medicine; Hirosaki University Graduate School of Medicine; Hirosaki Japan
| | - Soroku Yagihashi
- Department of Pathology and Molecular Medicine; Hirosaki University Graduate School of Medicine; Hirosaki Japan
| | - Sookja K. Chung
- School of Biomedical Sciences; Research Center of Heart, Brain, Hormone and Healthy Aging and State Key Laboratory of Pharmaceutical Biotechnology; The University of Hong Kong; Hong Kong SAR China
| | - Kazunori Sango
- Diabetic Neuropathy Project; Department of Sensory and Motor Systems; Tokyo Metropolitan Institute of Medical Science; Tokyo Japan
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Suzuki M, Sango K, Wada K, Nagai Y. Pathological role of lipid interaction with α-synuclein in Parkinson's disease. Neurochem Int 2018; 119:97-106. [PMID: 29305919 DOI: 10.1016/j.neuint.2017.12.014] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Revised: 12/11/2017] [Accepted: 12/31/2017] [Indexed: 12/11/2022]
Abstract
Alpha-synuclein (αSyn) plays a central role in the pathogenesis of Parkinson's disease (PD) and dementia with Lewy bodies (DLB). In sporadic PD and DLB, normally harmless αSyn proteins without any mutations might gain toxic functions by unknown mechanisms. Thus, it is important to elucidate the factors promoting the toxic conversion of αSyn, towards understanding the pathogenesis of and developing disease-modifying therapies for PD and DLB. Accumulating biophysical and biochemical studies have demonstrated that αSyn interacts with lipid membrane, and the interaction influences αSyn oligomerization and aggregation. Furthermore, genetic and clinicopathological studies have revealed mutations in the glucocerebrosidase 1 (GBA1) gene, which encodes a degrading enzyme for the glycolipid glucosylceramide (GlcCer), as strong risk factors for PD and DLB, and we recently demonstrated that GlcCer promotes toxic conversion of αSyn. Moreover, pathological studies have shown the existence of αSyn pathology in lysosomal storage disorders (LSDs) patient' brain, in which glycosphingolipids (GSLs) is found to be accumulated. In this review, we focus on the lipids as a key factor for inducing wild-type (WT) αSyn toxic conversion, we summarize the knowledge about the interaction between αSyn and lipid membrane, and propose our hypothesis that aberrantly accumulated GSLs might contribute to the toxic conversion of αSyn. Identifying the trigger for toxic conversion of αSyn would open a new therapeutic road to attenuate or prevent crucial events leading to the formation of toxic αSyn.
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Affiliation(s)
- Mari Suzuki
- Department of Neurotherapeutics, Osaka University Graduate School of Medicine, Suita, Osaka, 565-0871, Japan; Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira 187-8502, Japan; Diabetic Neuropathy Project, Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, Setagaya, Tokyo, 156-8506, Japan.
| | - Kazunori Sango
- Diabetic Neuropathy Project, Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, Setagaya, Tokyo, 156-8506, Japan
| | - Keiji Wada
- Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira 187-8502, Japan
| | - Yoshitaka Nagai
- Department of Neurotherapeutics, Osaka University Graduate School of Medicine, Suita, Osaka, 565-0871, Japan; Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira 187-8502, Japan.
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Omi M, Hata M, Nakamura N, Miyabe M, Ozawa S, Nukada H, Tsukamoto M, Sango K, Himeno T, Kamiya H, Nakamura J, Takebe J, Matsubara T, Naruse K. Transplantation of dental pulp stem cells improves long-term diabetic polyneuropathy together with improvement of nerve morphometrical evaluation. Stem Cell Res Ther 2017; 8:279. [PMID: 29237486 PMCID: PMC5729514 DOI: 10.1186/s13287-017-0729-5] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [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: 10/06/2017] [Revised: 11/13/2017] [Accepted: 11/20/2017] [Indexed: 02/08/2023] Open
Abstract
Background Although previous reports have revealed the therapeutic potential of stem cell transplantation in diabetic polyneuropathy, the effects of cell transplantation on long-term diabetic polyneuropathy have not been investigated. In this study, we investigated whether the transplantation of dental pulp stem cells (DPSCs) ameliorated long-term diabetic polyneuropathy in streptozotocin (STZ)-induced diabetic rats. Methods Forty-eight weeks after STZ injection, we transplanted DPSCs into the unilateral hindlimb skeletal muscles. Four weeks after DPSC transplantation (i.e., 52 weeks after STZ injection) the effects of DPSC transplantation on diabetic polyneuropathy were assessed. Results STZ-induced diabetic rats showed significant reductions in the sciatic motor/sensory nerve conduction velocity, increases in the current perception threshold, and decreases in capillary density in skeletal muscles and intra-epidermal nerve fiber density compared with normal rats, all of which were ameliorated by DPSC transplantation. Furthermore, sural nerve morphometrical analysis revealed that the transplantation of DPSCs significantly increased the myelin thickness and area. DPSC-conditioned media promoted the neurite outgrowth of dorsal root ganglion neurons and increased the viability and myelin-related protein expression of Schwann cells. Conclusions These results indicated that the transplantation of DPSCs contributed to the neurophysiological and neuropathological recovery from a long duration of diabetic polyneuropathy. Electronic supplementary material The online version of this article (doi:10.1186/s13287-017-0729-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Maiko Omi
- Department of Removable Prosthodontics, School of Dentistry, Aichi Gakuin University, 2-11 Suemori-dori, Chikusa-ku, Nagoya, Aichi, 464-8651, Japan
| | - Masaki Hata
- Department of Removable Prosthodontics, School of Dentistry, Aichi Gakuin University, 2-11 Suemori-dori, Chikusa-ku, Nagoya, Aichi, 464-8651, Japan
| | - Nobuhisa Nakamura
- Department of Internal Medicine, School of Dentistry, Aichi Gakuin University, 2-11 Suemori-dori, Chikusa-ku, Nagoya, Aichi, 464-8651, Japan
| | - Megumi Miyabe
- Department of Internal Medicine, School of Dentistry, Aichi Gakuin University, 2-11 Suemori-dori, Chikusa-ku, Nagoya, Aichi, 464-8651, Japan
| | - Shogo Ozawa
- Department of Removable Prosthodontics, School of Dentistry, Aichi Gakuin University, 2-11 Suemori-dori, Chikusa-ku, Nagoya, Aichi, 464-8651, Japan
| | - Hitoshi Nukada
- Department of Medicine, University of Otago Medical School, PO Box 913, Great King Street, Dunedin, New Zealand
| | - Masami Tsukamoto
- Laboratory of Peripheral Nerve Pathophysiology, Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo, 156-8506, Japan
| | - Kazunori Sango
- Laboratory of Peripheral Nerve Pathophysiology, Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo, 156-8506, Japan
| | - Tatsuhito Himeno
- Division of Diabetes, Department of Internal Medicine, Aichi Medical University School of Medicine, Nagakute, Aichi, Japan
| | - Hideki Kamiya
- Division of Diabetes, Department of Internal Medicine, Aichi Medical University School of Medicine, Nagakute, Aichi, Japan
| | - Jiro Nakamura
- Division of Diabetes, Department of Internal Medicine, Aichi Medical University School of Medicine, Nagakute, Aichi, Japan
| | - Jun Takebe
- Department of Removable Prosthodontics, School of Dentistry, Aichi Gakuin University, 2-11 Suemori-dori, Chikusa-ku, Nagoya, Aichi, 464-8651, Japan
| | - Tatsuaki Matsubara
- Department of Internal Medicine, School of Dentistry, Aichi Gakuin University, 2-11 Suemori-dori, Chikusa-ku, Nagoya, Aichi, 464-8651, Japan
| | - Keiko Naruse
- Department of Internal Medicine, School of Dentistry, Aichi Gakuin University, 2-11 Suemori-dori, Chikusa-ku, Nagoya, Aichi, 464-8651, Japan.
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Suzuki M, Neumann A, Saitoh Y, Fujikake N, Wada K, Sango K, Nagai Y. Improvement of misfolding protein-induced neurodegeneration by dietary restriction in drosophila. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2521] [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] [Indexed: 10/18/2022]
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Kawanami D, Matoba K, Takeda Y, Nagai Y, Akamine T, Yokota T, Sango K, Utsunomiya K. SGLT2 Inhibitors as a Therapeutic Option for Diabetic Nephropathy. Int J Mol Sci 2017; 18:ijms18051083. [PMID: 28524098 PMCID: PMC5454992 DOI: 10.3390/ijms18051083] [Citation(s) in RCA: 101] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Revised: 05/03/2017] [Accepted: 05/15/2017] [Indexed: 12/11/2022] Open
Abstract
Diabetic nephropathy (DN) is a major cause of end-stage renal disease (ESRD) worldwide. Glycemic and blood pressure (BP) control are important but not sufficient to attenuate the incidence and progression of DN. Sodium–glucose cotransporter (SGLT) 2 inhibitors are a new class of glucose-lowering agent suggested to exert renoprotective effects in glucose lowering-dependent and independent fashions. Experimental studies have shown that SGLT2 inhibitors attenuate DN in animal models of both type 1 diabetes (T1D) and type 2 diabetes (T2D), indicating a potential renoprotective effect beyond glucose reduction. Renoprotection by SGLT2 inhibitors has been demonstrated in T2D patients with a high cardiovascular risk in randomized controlled trials (RCTs). These favorable effects of SGLT2 inhibitors are explained by several potential mechanisms, including the attenuation of glomerular hyperfiltration, inflammation and oxidative stress. In this review article, we discuss the renoprotective effects of SGLT2 inhibitors by integrating experimental findings with the available clinical data.
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Affiliation(s)
- Daiji Kawanami
- Division of Diabetes, Metabolism and Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, 3-25-8 Nishi-shinbashi, Minato-ku, Tokyo 105-8461, Japan.
| | - Keiichiro Matoba
- Division of Diabetes, Metabolism and Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, 3-25-8 Nishi-shinbashi, Minato-ku, Tokyo 105-8461, Japan.
| | - Yusuke Takeda
- Division of Diabetes, Metabolism and Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, 3-25-8 Nishi-shinbashi, Minato-ku, Tokyo 105-8461, Japan.
| | - Yosuke Nagai
- Division of Diabetes, Metabolism and Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, 3-25-8 Nishi-shinbashi, Minato-ku, Tokyo 105-8461, Japan.
| | - Tomoyo Akamine
- Division of Diabetes, Metabolism and Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, 3-25-8 Nishi-shinbashi, Minato-ku, Tokyo 105-8461, Japan.
- Diabetic Neuropathy Project, Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo 156-8506, Japan.
| | - Tamotsu Yokota
- Division of Diabetes, Metabolism and Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, 3-25-8 Nishi-shinbashi, Minato-ku, Tokyo 105-8461, Japan.
| | - Kazunori Sango
- Diabetic Neuropathy Project, Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo 156-8506, Japan.
| | - Kazunori Utsunomiya
- Division of Diabetes, Metabolism and Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, 3-25-8 Nishi-shinbashi, Minato-ku, Tokyo 105-8461, Japan.
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Sango K, Mizukami H, Horie H, Yagihashi S. Impaired Axonal Regeneration in Diabetes. Perspective on the Underlying Mechanism from In Vivo and In Vitro Experimental Studies. Front Endocrinol (Lausanne) 2017; 8:12. [PMID: 28203223 PMCID: PMC5285379 DOI: 10.3389/fendo.2017.00012] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Accepted: 01/16/2017] [Indexed: 12/21/2022] Open
Abstract
Axonal regeneration after peripheral nerve injury is impaired in diabetes, but its precise mechanisms have not been elucidated. In this paper, we summarize the progress of research on altered axonal regeneration in animal models of diabetes and cultured nerve tissues exposed to hyperglycemia. Impaired nerve regeneration in animal diabetes can be attributed to dysfunction of neurons and Schwann cells, unfavorable stromal environment supportive of regenerating axons, and alterations of target tissues receptive to reinnervation. In particular, there are a number of factors such as enhanced activity of the negative regulators of axonal regeneration (e.g., phosphatase and tensin homolog deleted on chromosome 10 and Rho/Rho kinase), delayed Wallerian degeneration, alterations of the extracellular matrix components, enhanced binding of advanced glycation endproducts (AGEs) with the receptor for AGE, and delayed muscle reinnervation that can be obstacles to functional recovery after an axonal injury. It is also noteworthy that we and others have observed excessive neurite outgrowth from peripheral sensory ganglion explants from streptozotocin (STZ)-diabetic mice in culture and enhanced regeneration of small nerve fibers after sciatic nerve injury in STZ-induced diabetic rats. The excess of abortive neurite outgrowth may lead to misconnections of axons and target organs, which may interfere with appropriate target reinnervation and functional repair. Amelioration of perturbed nerve regeneration may be crucial for the future management of diabetic neuropathy.
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Affiliation(s)
- Kazunori Sango
- Diabetic Neuropathy Project, Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan
- *Correspondence: Kazunori Sango,
| | - Hiroki Mizukami
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | | | - Soroku Yagihashi
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
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Niimi N, Yako H, Tsukamoto M, Takaku S, Yamauchi J, Kawakami E, Yanagisawa H, Watabe K, Utsunomiya K, Sango K. Involvement of oxidative stress and impaired lysosomal degradation in amiodarone-induced schwannopathy. Eur J Neurosci 2016; 44:1723-33. [PMID: 27152884 DOI: 10.1111/ejn.13268] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Revised: 04/28/2016] [Accepted: 04/28/2016] [Indexed: 12/14/2022]
Abstract
Amiodarone hydrochloride (AMD), an anti-arrhythmic agent, has been shown to cause peripheral neuropathy; however, its pathogenesis remains unknown. We examined the toxic effects of AMD on an immortalized adult rat Schwann cell line, IFRS1, and cocultures of IFRS1 cells and adult rat dorsal root ganglion neurons or nerve growth factor-primed PC12 cells. Treatment with AMD (1, 5, and 10 μm) induced time- and dose-dependent cell death, accumulation of phospholipids and neutral lipids, upregulation of the expression of gangliosides, and oxidative stress (increased nuclear factor E2-related factor in nuclear extracts and reduced GSH/GSSG ratios) in IFRS1 cells. It also induced the upregulation of LC3-II and p62 expression, with phosphorylation of p62, suggesting that deficient autolysosomal degradation is involved in AMD-induced IFRS1 cell death. Furthermore, treatment of the cocultures with AMD induced detachment of IFRS1 cells from neurite networks in a time- and dose-dependent manner. These findings suggest that AMD-induced lysosomal storage accompanied by enhanced oxidative stress and impaired lysosomal degradation in Schwann cells might be a cause of demyelination in the peripheral nervous system.
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Affiliation(s)
- Naoko Niimi
- Diabetic Neuropathy Project (Former ALS/Neuropathy Project), Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo, 156-8506, Japan
| | - Hideji Yako
- Diabetic Neuropathy Project (Former ALS/Neuropathy Project), Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo, 156-8506, Japan
| | - Masami Tsukamoto
- Diabetic Neuropathy Project (Former ALS/Neuropathy Project), Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo, 156-8506, Japan.,Division of Diabetes, Metabolism & Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, Minato-ku, Tokyo, Japan
| | - Shizuka Takaku
- Diabetic Neuropathy Project (Former ALS/Neuropathy Project), Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo, 156-8506, Japan
| | - Junji Yamauchi
- Department of Pharmacology, National Research Institute for Child Health and Development, Setagaya, Tokyo, Japan
| | - Emiko Kawakami
- Diabetic Neuropathy Project (Former ALS/Neuropathy Project), Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo, 156-8506, Japan
| | - Hiroko Yanagisawa
- Diabetic Neuropathy Project (Former ALS/Neuropathy Project), Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo, 156-8506, Japan
| | - Kazuhiko Watabe
- Diabetic Neuropathy Project (Former ALS/Neuropathy Project), Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo, 156-8506, Japan
| | - Kazunori Utsunomiya
- Division of Diabetes, Metabolism & Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, Minato-ku, Tokyo, Japan
| | - Kazunori Sango
- Diabetic Neuropathy Project (Former ALS/Neuropathy Project), Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo, 156-8506, Japan
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Affiliation(s)
- Kazunori Sango
- Diabetic Neuropathy Project (Former ALS/Neuropathy project), Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo, Japan
| | - Kazunori Utsunomiya
- Division of Diabetes, Metabolism & Endocrinology, Department of Internal Medicine, Jikei University School of Medicine, Minato-ku, Tokyo, Japan
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Takaku S, Niimi N, Kadoya T, Yako H, Tsukamoto M, Sakumi K, Nakabeppu Y, Horie H, Sango K. Galectin-1 and galectin-3 as key molecules for peripheral nerve degeneration and regeneration. AIMS Molecular Science 2016. [DOI: 10.3934/molsci.2016.3.325] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Tsukamoto M, Niimi N, Sango K, Takaku S, Kanazawa Y, Utsunomiya K. Neurotrophic and neuroprotective properties of exendin-4 in adult rat dorsal root ganglion neurons: involvement of insulin and RhoA. Histochem Cell Biol 2015; 144:249-59. [PMID: 26026990 DOI: 10.1007/s00418-015-1333-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/13/2015] [Indexed: 11/26/2022]
Abstract
Glucagon-like peptide-1 (GLP-1) is thought to preserve neurons and glia following axonal injury and neurodegenerative disorders. We investigated the neurotrophic and neuroprotective properties of exendin (Ex)-4, a synthetic GLP-1 receptor (GLP-1R) agonist, on adult rat dorsal root ganglion (DRG) neurons and PC12 cells. GLP-1R was predominantly localized on large and small peptidergic neurons in vivo and in vitro, suggesting the involvement of GLP-1 in both the large and small sensory fiber functions. Ex-4 dose-dependently (1 ≤ 10 ≤ 100 nM) promoted neurite outgrowth and neuronal survival at 2 and 7 days in culture, respectively. Treatment with 100 nM Ex-4 restored the reduced neurite outgrowth and viability of DRG neurons caused by the insulin removal from the medium and suppressed the activity of RhoA, an inhibitory regulator for peripheral nerve regeneration, in PC12 cells. Furthermore, these effects were attenuated by co-treatment with phosphatidylinositol-3'-phosphate kinase (PI3K) inhibitor, LY294002. These findings imply that Ex-4 enhances neurite outgrowth and neuronal survival through the activation of PI3K signaling pathway, which negatively regulates RhoA activity. Ex-4 and other GLP-1R agonists may compensate for the reduced insulin effects on neurons, thereby being beneficial for the treatment of diabetic neuropathy.
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Affiliation(s)
- Masami Tsukamoto
- Diabetic Neuropathy Project (Former Laboratory of Peripheral Nerve Pathophysiology), Department of Sensory and Motor Systems, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo, 156-8506, Japan
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Murakami T, Sango K, Watabe K, Niimi N, Takaku S, Li Z, Yamamura KI, Sunada Y. Schwann cells contribute to neurodegeneration in transthyretin amyloidosis. J Neurochem 2015; 134:66-74. [DOI: 10.1111/jnc.13068] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Revised: 01/30/2015] [Accepted: 02/03/2015] [Indexed: 12/15/2022]
Affiliation(s)
| | - Kazunori Sango
- Department of Sensory and Motor Systems (ALS/Neuropathy Project); Tokyo Metropolitan Institute of Medical Science; Tokyo Japan
| | - Kazuhiko Watabe
- Department of Sensory and Motor Systems (ALS/Neuropathy Project); Tokyo Metropolitan Institute of Medical Science; Tokyo Japan
| | - Naoko Niimi
- Department of Sensory and Motor Systems (ALS/Neuropathy Project); Tokyo Metropolitan Institute of Medical Science; Tokyo Japan
| | - Shizuka Takaku
- Department of Sensory and Motor Systems (ALS/Neuropathy Project); Tokyo Metropolitan Institute of Medical Science; Tokyo Japan
| | - Zhenghua Li
- Division of Developmental Genetics; Institute of Resource Development and Analysis; Kumamoto University; Kumamoto Japan
| | - Ken-ichi Yamamura
- Division of Developmental Genetics; Institute of Resource Development and Analysis; Kumamoto University; Kumamoto Japan
| | - Yoshihide Sunada
- Department of Neurology; Kawasaki Medical School; Kurashiki Japan
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Tsukamoto M, Sango K, Niimi N, Yanagisawa H, Watabe K, Utsunomiya K. Upregulation of galectin-3 in immortalized Schwann cells IFRS1 under diabetic conditions. Neurosci Res 2015; 92:80-5. [DOI: 10.1016/j.neures.2014.11.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Revised: 10/23/2014] [Accepted: 11/27/2014] [Indexed: 01/08/2023]
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Torii T, Miyamoto Y, Tago K, Sango K, Nakamura K, Sanbe A, Tanoue A, Yamauchi J. Arf6 guanine nucleotide exchange factor cytohesin-2 binds to CCDC120 and is transported along neurites to mediate neurite growth. J Biol Chem 2014; 289:33887-903. [PMID: 25326380 DOI: 10.1074/jbc.m114.575787] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [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: 11/06/2022] Open
Abstract
The mechanism of neurite growth is complicated, involving continuous cytoskeletal rearrangement and vesicular trafficking. Cytohesin-2 is a guanine nucleotide exchange factor for Arf6, an Arf family molecular switch protein, controlling cell morphological changes such as neuritogenesis. Here, we show that cytohesin-2 binds to a protein with a previously unknown function, CCDC120, which contains three coiled-coil domains, and is transported along neurites in differentiating N1E-115 cells. Transfection of the small interfering RNA (siRNA) specific for CCDC120 into cells inhibits neurite growth and Arf6 activation. When neurites start to extend, vesicles containing CCDC120 and cytohesin-2 are transported in an anterograde manner rather than a retrograde one. As neurites continue extension, anterograde vesicle transport decreases. CCDC120 knockdown inhibits cytohesin-2 localization into vesicles containing CCDC120 and diffuses cytohesin-2 in cytoplasmic regions, illustrating that CCDC120 determines cytohesin-2 localization in growing neurites. Reintroduction of the wild type CCDC120 construct into cells transfected with CCDC120 siRNA reverses blunted neurite growth and Arf6 activity, whereas the cytohesin-2-binding CC1 region-deficient CCDC120 construct does not. Thus, cytohesin-2 is transported along neurites by vesicles containing CCDC120, and it mediates neurite growth. These results suggest a mechanism by which guanine nucleotide exchange factor for Arf6 is transported to mediate neurite growth.
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Affiliation(s)
- Tomohiro Torii
- From the Department of Pharmacology, National Research Institute for Child Health and Development, Setagaya, Tokyo 157-8535,
| | - Yuki Miyamoto
- From the Department of Pharmacology, National Research Institute for Child Health and Development, Setagaya, Tokyo 157-8535
| | - Kenji Tago
- the Graduate School of Medicine, Jichi Medical University, Shimotsuke, Tochigi 329-0498
| | - Kazunori Sango
- the Amyotrophic Lateral Sclerosis/Neuropathy Project, Tokyo Metropolitan Institute of Medical Science, Setagaya, Tokyo 156-8506
| | - Kazuaki Nakamura
- From the Department of Pharmacology, National Research Institute for Child Health and Development, Setagaya, Tokyo 157-8535
| | - Atsushi Sanbe
- the School of Pharmacy, Iwate Medical University, Morioka, Iwate 020-0023, and
| | - Akito Tanoue
- From the Department of Pharmacology, National Research Institute for Child Health and Development, Setagaya, Tokyo 157-8535
| | - Junji Yamauchi
- From the Department of Pharmacology, National Research Institute for Child Health and Development, Setagaya, Tokyo 157-8535, the Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo, Tokyo 113-8510, Japan
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Watabe K, Akiyama K, Kawakami E, Ishii T, Endo K, Yanagisawa H, Sango K, Tsukamoto M. Adenoviral expression of TDP-43 and FUS genes and shRNAs for protein degradation pathways in rodent motoneurons in vitro and in vivo. Neuropathology 2013; 34:83-98. [DOI: 10.1111/neup.12058] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2013] [Accepted: 07/17/2013] [Indexed: 02/06/2023]
Affiliation(s)
- Kazuhiko Watabe
- ALS/Neuropathy Project; Tokyo Metropolitan Institute of Medical Science; Tokyo Japan
| | - Keiko Akiyama
- ALS/Neuropathy Project; Tokyo Metropolitan Institute of Medical Science; Tokyo Japan
| | - Emiko Kawakami
- ALS/Neuropathy Project; Tokyo Metropolitan Institute of Medical Science; Tokyo Japan
| | - Tomohiro Ishii
- ALS/Neuropathy Project; Tokyo Metropolitan Institute of Medical Science; Tokyo Japan
| | - Kentaro Endo
- Center for Basic Technology Research; Tokyo Metropolitan Institute of Medical Science; Tokyo Japan
| | - Hiroko Yanagisawa
- ALS/Neuropathy Project; Tokyo Metropolitan Institute of Medical Science; Tokyo Japan
| | - Kazunori Sango
- ALS/Neuropathy Project; Tokyo Metropolitan Institute of Medical Science; Tokyo Japan
| | - Masami Tsukamoto
- ALS/Neuropathy Project; Tokyo Metropolitan Institute of Medical Science; Tokyo Japan
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Takaku S, Yanagisawa H, Watabe K, Horie H, Kadoya T, Sakumi K, Nakabeppu Y, Poirier F, Sango K. GDNF promotes neurite outgrowth and upregulates galectin-1 through the RET/PI3K signaling in cultured adult rat dorsal root ganglion neurons. Neurochem Int 2013; 62:330-9. [DOI: 10.1016/j.neuint.2013.01.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2012] [Revised: 12/28/2012] [Accepted: 01/08/2013] [Indexed: 01/22/2023]
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Abstract
We have established spontaneously immortalized Schwann cell lines from adult ICR mice [IMS32] and Fischer344 rats [IFRS1]. IMS32 cells display distinct Schwann cell phenotypes such as a spindle-shaped morphology and the expression of glial cell markers (e.g. S100, glial fibrillary acidic protein (GFAP), p75 low-affinity neurotrophin receptor (p75(NTR))) and neurotrophic factors. In addition, conditioned medium obtained from IMS32 cells enhances neurite elongation of PC12 cells and mouse dorsal root ganglion (DRG) neurons. IMS32 cells have been utilized to investigate the action mechanisms of various molecules that accelerate peripheral nerve regeneration (e.g. ciliary neurotrophic factor, sonic hedgehog, galectin-1). Like IMS32 cells, IFRS1 cells retain the characteristic features of mature Schwann cells as described above. Furthermore, IFRS1 cells have been shown to myelinate neurites in coculture with adult rat DRG neurons and PC12 cells. Our current investigation with IFRS1 cells focuses on the molecular mechanisms of myelination-inducible factors, such as soluble neuregulin-1 type III and exendin-4. These Schwann cell lines can be valuable tools for exploring neuron-Schwann cell interactions, pathobiology of axonal degeneration and regeneration in the peripheral nervous system, and novel therapeutic approaches against neurological disorders in patients with relevant diseases.
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Affiliation(s)
- Kazunori Sango
- Laboratory of Peripheral Nerve Pathophysiology, Tokyo Metropolitan Institute of Medical Science
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Sango K, Kawakami E, Yanagisawa H, Takaku S, Watabe K. Myelination in cocultures of established neuronal and Schwann cell lines. Neurosci Res 2011. [DOI: 10.1016/j.neures.2011.07.247] [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] [Indexed: 11/15/2022]
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Komuta Y, Kimura-Kuroda J, Yanagisawa H, Sango K, Kawano H. Postnatal development of the fibrotic scar formation: An in vitro study. Neurosci Res 2011. [DOI: 10.1016/j.neures.2011.07.1480] [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] [Indexed: 11/16/2022]
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Sango K, Yanagisawa H, Kawakami E, Takaku S, Ajiki K, Watabe K. Spontaneously immortalized Schwann cells from adult Fischer rat as a valuable tool for exploring neuron-Schwann cell interactions. J Neurosci Res 2011; 89:898-908. [DOI: 10.1002/jnr.22605] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2010] [Revised: 12/15/2010] [Accepted: 01/11/2011] [Indexed: 01/17/2023]
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Watabe K, Sango K. [Schwann cell cultures for studying peripheral nerve disorders]. Nihon Rinsho 2010; 68 Suppl 9:637-640. [PMID: 21667523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Affiliation(s)
- Kazuhiko Watabe
- Department of Molecular Neuropathology, Tokyo Metropolitan Institute for Neuroscience, Tokyo Metropolitan Organization for Medical Research
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Sango K, Ajiki K, Kawakami E, Yanagisawa H, Takaku S, Watabe K. Spontaneously immortalized adult Fischer rat Schwann cells IFRS1 as a valuable tool for exploring neuron–Schwann cell interactions. Neurosci Res 2010. [DOI: 10.1016/j.neures.2010.07.1070] [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] [Indexed: 11/15/2022]
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