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Duan W, Guo M, Yi L, Zhang J, Bi Y, Liu Y, Li Y, Li Z, Ma Y, Zhang G, Liu Y, Song X, Li C. Deletion of Tbk1 disrupts autophagy and reproduces behavioral and locomotor symptoms of FTD-ALS in mice. Aging (Albany NY) 2020; 11:2457-2476. [PMID: 31039129 PMCID: PMC6519994 DOI: 10.18632/aging.101936] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Accepted: 04/23/2019] [Indexed: 12/12/2022]
Abstract
Haploinsufficiency of the protein kinase Tbk1 has shown to cause both amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD); however, the pathogenic mechanisms are unclear. Here we show that conditional neuronal deletion of Tbk1 in leads to cognitive and locomotor deficits in mice. Tbk1-NKO mice exhibited numerous neuropathological changes, including neurofibrillary tangles, abnormal dendrites, reduced dendritic spine density, and cortical synapse loss. The Purkinje cell layer of the cerebellum presented dendritic swelling, abnormally shaped astrocytes, and p62- and ubiquitin-positive aggregates, suggesting impaired autophagy. Inhibition of autophagic flux with bafilomycin A increased total Tkb1 levels in motor neuron-like cells in vitro, suggesting autophagy-dependent degradation of Tbk1. Although Tbk1 over-expression did not affect mutant SOD1 levels in SOD1G93A-transfected cells, it increased the soluble/insoluble ratio and reduced the number and size of SOD1G93A aggregates. Finally, in vivo experiments showed that Tkb1 expression was reduced in SOD1G93A ALS transgenic mice, which showed decreased p62 protein aggregation and extended survival after ICV injection of adeno-associated viral vectors encoding Tbk1. These data shed light on the neuropathological changes that result from Tbk1 deficiency and hint at impaired autophagy as a contributing factor to the cognitive and locomotor deficits that characterize FTD-ALS in patients with Tkb1 haploinsufficiency.
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Affiliation(s)
- Weisong Duan
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, People's Republic of China.,Neurological Laboratory of Hebei Province, Shijiazhuang, People's Republic of China.,Institute of Cardiocerebrovascular Disease, Shijiazhuang, People's Republic of China
| | - Moran Guo
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, People's Republic of China
| | - Le Yi
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, People's Republic of China
| | - Jie Zhang
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, People's Republic of China
| | - Yue Bi
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, People's Republic of China
| | - Yakun Liu
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, People's Republic of China
| | - Yuanyuan Li
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, People's Republic of China
| | - Zhongyao Li
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, People's Republic of China
| | - Yanqin Ma
- Jiangsu Nhwa Pharmaceutical Co. Ltd, Nantong 226000, People's Republic of China
| | - Guisen Zhang
- Jiangsu Nhwa Pharmaceutical Co. Ltd, Nantong 226000, People's Republic of China
| | - Yaling Liu
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, People's Republic of China.,Neurological Laboratory of Hebei Province, Shijiazhuang, People's Republic of China.,Institute of Cardiocerebrovascular Disease, Shijiazhuang, People's Republic of China
| | - Xueqing Song
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, People's Republic of China.,Neurological Laboratory of Hebei Province, Shijiazhuang, People's Republic of China.,Institute of Cardiocerebrovascular Disease, Shijiazhuang, People's Republic of China
| | - Chunyan Li
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, People's Republic of China.,Neurological Laboratory of Hebei Province, Shijiazhuang, People's Republic of China.,Institute of Cardiocerebrovascular Disease, Shijiazhuang, People's Republic of China
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Lidgerwood GE, Pitson SM, Bonder C, Pébay A. Roles of lysophosphatidic acid and sphingosine-1-phosphate in stem cell biology. Prog Lipid Res 2018; 72:42-54. [PMID: 30196008 DOI: 10.1016/j.plipres.2018.09.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Revised: 08/15/2018] [Accepted: 09/05/2018] [Indexed: 02/06/2023]
Abstract
Stem cells are unique in their ability to self-renew and differentiate into various cell types. Because of these features, stem cells are key to the formation of organisms and play fundamental roles in tissue regeneration and repair. Mechanisms controlling their fate are thus fundamental to the development and homeostasis of tissues and organs. Lysophosphatidic acid (LPA) and sphingosine-1-phosphate (S1P) are bioactive phospholipids that play a wide range of roles in multiple cell types, during developmental and pathophysiological events. Considerable evidence now demonstrates the potent roles of LPA and S1P in the biology of pluripotent and adult stem cells, from maintenance to repair. Here we review their roles for each main category of stem cells and explore how those effects impact development and physiopathology.
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Affiliation(s)
- Grace E Lidgerwood
- Centre for Eye Research Australia, Royal Victorian Eye and Ear Hospital, East Melbourne, Australia; Ophthalmology, Department of Surgery, the University of Melbourne, Melbourne, Australia
| | - Stuart M Pitson
- Centre for Cancer Biology, University of South Australia and SA Pathology, Adelaide, Australia
| | - Claudine Bonder
- Centre for Cancer Biology, University of South Australia and SA Pathology, Adelaide, Australia
| | - Alice Pébay
- Centre for Eye Research Australia, Royal Victorian Eye and Ear Hospital, East Melbourne, Australia; Ophthalmology, Department of Surgery, the University of Melbourne, Melbourne, Australia.
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Acharya MM, Martirosian V, Christie LA, Riparip L, Strnadel J, Parihar VK, Limoli CL. Defining the optimal window for cranial transplantation of human induced pluripotent stem cell-derived cells to ameliorate radiation-induced cognitive impairment. Stem Cells Transl Med 2014; 4:74-83. [PMID: 25391646 DOI: 10.5966/sctm.2014-0063] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Past preclinical studies have demonstrated the capability of using human stem cell transplantation in the irradiated brain to ameliorate radiation-induced cognitive dysfunction. Intrahippocampal transplantation of human embryonic stem cells and human neural stem cells (hNSCs) was found to functionally restore cognition in rats 1 and 4 months after cranial irradiation. To optimize the potential therapeutic benefits of human stem cell transplantation, we have further defined optimal transplantation windows for maximizing cognitive benefits after irradiation and used induced pluripotent stem cell-derived hNSCs (iPSC-hNSCs) that may eventually help minimize graft rejection in the host brain. For these studies, animals given an acute head-only dose of 10 Gy were grafted with iPSC-hNSCs at 2 days, 2 weeks, or 4 weeks following irradiation. Animals receiving stem cell grafts showed improved hippocampal spatial memory and contextual fear-conditioning performance compared with irradiated sham-surgery controls when analyzed 1 month after transplantation surgery. Importantly, superior performance was evident when stem cell grafting was delayed by 4 weeks following irradiation compared with animals grafted at earlier times. Analysis of the 4-week cohort showed that the surviving grafted cells migrated throughout the CA1 and CA3 subfields of the host hippocampus and differentiated into neuronal (∼39%) and astroglial (∼14%) subtypes. Furthermore, radiation-induced inflammation was significantly attenuated across multiple hippocampal subfields in animals receiving iPSC-hNSCs at 4 weeks after irradiation. These studies expand our prior findings to demonstrate that protracted stem cell grafting provides improved cognitive benefits following irradiation that are associated with reduced neuroinflammation.
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Affiliation(s)
- Munjal M Acharya
- Department of Radiation Oncology, University of California, Irvine, Irvine, California, USA; Department of Pathology, University of California, San Diego, La Jolla, California, USA
| | - Vahan Martirosian
- Department of Radiation Oncology, University of California, Irvine, Irvine, California, USA; Department of Pathology, University of California, San Diego, La Jolla, California, USA
| | - Lori-Ann Christie
- Department of Radiation Oncology, University of California, Irvine, Irvine, California, USA; Department of Pathology, University of California, San Diego, La Jolla, California, USA
| | - Lara Riparip
- Department of Radiation Oncology, University of California, Irvine, Irvine, California, USA; Department of Pathology, University of California, San Diego, La Jolla, California, USA
| | - Jan Strnadel
- Department of Radiation Oncology, University of California, Irvine, Irvine, California, USA; Department of Pathology, University of California, San Diego, La Jolla, California, USA
| | - Vipan K Parihar
- Department of Radiation Oncology, University of California, Irvine, Irvine, California, USA; Department of Pathology, University of California, San Diego, La Jolla, California, USA
| | - Charles L Limoli
- Department of Radiation Oncology, University of California, Irvine, Irvine, California, USA; Department of Pathology, University of California, San Diego, La Jolla, California, USA
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Acharya MM, Christie LA, Hazel TG, Johe KK, Limoli CL. Transplantation of human fetal-derived neural stem cells improves cognitive function following cranial irradiation. Cell Transplant 2013; 23:1255-66. [PMID: 23866792 DOI: 10.3727/096368913x670200] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Treatment of central nervous system (CNS) malignancies typically involves radiotherapy to forestall tumor growth and recurrence following surgical resection. Despite the many benefits of cranial radiotherapy, survivors often suffer from a wide range of debilitating and progressive cognitive deficits. Thus, while patients afflicted with primary and secondary malignancies of the CNS now experience longer local regional control and progression-free survival, there remains no clinical recourse for the unintended neurocognitive sequelae associated with their cancer treatments. Multiple mechanisms contribute to disrupted cognition following irradiation, including the depletion of radiosensitive populations of stem and progenitor cells in the hippocampus. We have explored the potential of using intrahippocampal transplantation of human stem cells to ameliorate radiation-induced cognitive dysfunction. Past studies demonstrated the capability of cranially transplanted human embryonic (hESCs) and neural (hNSCs) stem cells to functionally restore cognition in rats 1 and 4 months after cranial irradiation. The present study employed an FDA-approved fetal-derived hNSC line capable of large scale-up under good manufacturing practice (GMP). Animals receiving cranial transplantation of these cells 1 month following irradiation showed improved hippocampal spatial memory and contextual fear conditioning performance compared to irradiated, sham surgery controls. Significant newly born (doublecortin positive) neurons and a smaller fraction of glial subtypes were observed within and nearby the transplantation core. Engrafted cells migrated and differentiated into neuronal and glial subtypes throughout the CA1 and CA3 subfields of the host hippocampus. These studies expand our prior findings to demonstrate that transplantation of fetal-derived hNSCs improves cognitive deficits in irradiated animals, as assessed by two separate cognitive tasks.
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Affiliation(s)
- Munjal M Acharya
- Department of Radiation Oncology, University of California, Irvine, CA, USA
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