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Perez GA, Park KW, Lanza D, Cicardo J, Danish Uddin M, Jankowsky JL. Generation of a Dcx-CreER T2 knock-in mouse for genetic manipulation of newborn neurons. Genesis 2024; 62:e23584. [PMID: 38102875 PMCID: PMC11021165 DOI: 10.1002/dvg.23584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 11/19/2023] [Accepted: 11/29/2023] [Indexed: 12/17/2023]
Abstract
A wide variety of CreERT2 driver lines are available for genetic manipulation of adult-born neurons in the mouse brain. These tools have been instrumental in studying fate potential, migration, circuit integration, and morphology of the stem cells supporting lifelong neurogenesis. Despite a wealth of tools, genetic manipulation of adult-born neurons for circuit and behavioral studies has been limited by poor specificity of many driver lines targeting early progenitor cells and by the inaccessibility of lines selective for later stages of neuronal maturation. We sought to address these limitations by creating a new CreERT2 driver line targeted to the endogenous mouse doublecortin locus as a marker of fate-specified neuroblasts and immature neurons. Our new model places a T2A-CreERT2 cassette immediately downstream of the Dcx coding sequence on the X chromosome, allowing expression of both Dcx and CreERT2 proteins in the endogenous spatiotemporal pattern for this gene. We demonstrate that the new mouse line drives expression of a Cre-dependent reporter throughout the brain in neonatal mice and in known neurogenic niches of adult animals. The line has been deposited with the Jackson Laboratory and should provide an accessible tool for studies targeting fate-restricted neuronal precursors.
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Affiliation(s)
- Gabriella A. Perez
- Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030
| | - Kyung-Won Park
- Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030
| | - Denise Lanza
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030
| | - Jenna Cicardo
- Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030
| | - M. Danish Uddin
- Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030
| | - Joanna L. Jankowsky
- Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030
- Departments of Neurology, Neurosurgery, and Molecular and Cellular Biology, Huffington Center on Aging, Baylor College of Medicine, Houston, TX 77030
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2
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Bedolla AM, McKinsey GL, Ware K, Santander N, Arnold TD, Luo Y. A comparative evaluation of the strengths and potential caveats of the microglial inducible CreER mouse models. Cell Rep 2024; 43:113660. [PMID: 38217856 PMCID: PMC10874587 DOI: 10.1016/j.celrep.2023.113660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 10/02/2023] [Accepted: 12/20/2023] [Indexed: 01/15/2024] Open
Abstract
The recent proliferation of new Cre and CreER recombinase lines provides researchers with a diverse toolkit to study microglial gene function. To determine how best to apply these lines in studies of microglial gene function, a thorough and detailed comparison of their properties is needed. Here, we examined four different microglial CreER lines (Cx3cr1YFP-CreER(Litt), Cx3cr1CreER(Jung), P2ry12CreER, and Tmem119CreER), focusing on (1) recombination specificity, (2) leakiness (the degree of tamoxifen-independent recombination in microglia and other cells), (3) the efficiency of tamoxifen-induced recombination, (4) extraneural recombination (the degree of recombination in cells outside of the CNS, particularly myelo/monocyte lineages), and (5) off-target effects in the context of neonatal brain development. We identify important caveats and strengths for these lines, which will provide broad significance for researchers interested in performing conditional gene deletion in microglia. We also provide data emphasizing the potential of these lines for injury models that result in the recruitment of splenic immune cells.
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Affiliation(s)
- Alicia M Bedolla
- Department of Molecular and Cellular Biosciences, University of Cincinnati, Cincinnati, OH 45229, USA; Neuroscience Graduate Program, University of Cincinnati, Cincinnati, OH 45229, USA
| | - Gabriel L McKinsey
- Department of Pediatrics, University of California, San Francisco, San Francisco, CA 94143, USA; Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Kierra Ware
- Department of Molecular and Cellular Biosciences, University of Cincinnati, Cincinnati, OH 45229, USA
| | - Nicolas Santander
- Instituto de Ciencias de la Salud, Universidad de O'Higgins, Rancagua, Chile
| | - Thomas D Arnold
- Department of Pediatrics, University of California, San Francisco, San Francisco, CA 94143, USA; Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Yu Luo
- Department of Molecular and Cellular Biosciences, University of Cincinnati, Cincinnati, OH 45229, USA; Neuroscience Graduate Program, University of Cincinnati, Cincinnati, OH 45229, USA; Immunology Graduate Program, Cincinnati Children's Hospital Medical Center.
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3
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Liu Z, Wang Z, Zhu Z, Hong J, Cui L, Hao Y, Cheng G, Tan R. Crocetin Regulates Functions of Neural Stem Cells to Generate New Neurons for Cerebral Ischemia Recovery. Adv Healthc Mater 2023; 12:e2203132. [PMID: 37001492 DOI: 10.1002/adhm.202203132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 03/25/2023] [Indexed: 04/03/2023]
Abstract
Many neurons undergo apoptosis after ischemic stroke. In the brain, neurogenesis has the potential for neuronal replacement and can be activated by external conditions to repair the injury. Crocetin (CRO), naturally extracted from the plant saffron, acts as a neuroprotective agent for ischemic stroke. However, the underlying mechanism remains unknown. In this work, the effect of CRO on neural stem cell (NSC) behaviors and subventricular zone neurogenesis is investigated. Initially, NSCs are incubated with different concentrations of CRO to detect the cell proliferation and differentiation in vitro. Second, ischemic stroke induced rats are treated with CRO using nimodipine (NMDP) as a comparison. The behavioral functions, infarcted volume, and apoptotic Nissl bodies of rats are noticeably improved after CRO-treatment, comparable to those of NMDP. In addition, the increased regional cerebral blood flow and promoted neuronal differentiation are achieved by CRO-treatment. Brain tissue examination shows significantly increased neuronal regeneration in the focal ischemic injury area. Meanwhile, the length of neurites is prolonged, indicating that CRO could potentially promote neurite extension to enhance cell-cell communication. These findings demonstrate that CRO facilitated the neuronal differentiation of NSCs by activating subventricular zone neurogenesis in damaged cortex and striatum sites to repair ischemic stroke.
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Affiliation(s)
- Zhongqing Liu
- College of Life Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, China
| | - Zhaojun Wang
- College of Life Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, China
| | - Zhanchi Zhu
- School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei, Anhui, 230026, China
- CAS Key Laboratory of Nano-Bio Interface, Suzhou Institute of Nano-Tech and Nano Bionics, Chinese Academy of Sciences, Suzhou, Jiangsu, 215123, China
| | - Jing Hong
- School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei, Anhui, 230026, China
- CAS Key Laboratory of Nano-Bio Interface, Suzhou Institute of Nano-Tech and Nano Bionics, Chinese Academy of Sciences, Suzhou, Jiangsu, 215123, China
| | - Leisha Cui
- School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei, Anhui, 230026, China
- CAS Key Laboratory of Nano-Bio Interface, Suzhou Institute of Nano-Tech and Nano Bionics, Chinese Academy of Sciences, Suzhou, Jiangsu, 215123, China
| | - Ying Hao
- School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei, Anhui, 230026, China
- CAS Key Laboratory of Nano-Bio Interface, Suzhou Institute of Nano-Tech and Nano Bionics, Chinese Academy of Sciences, Suzhou, Jiangsu, 215123, China
| | - Guosheng Cheng
- School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei, Anhui, 230026, China
- CAS Key Laboratory of Nano-Bio Interface, Suzhou Institute of Nano-Tech and Nano Bionics, Chinese Academy of Sciences, Suzhou, Jiangsu, 215123, China
| | - Rui Tan
- College of Life Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, China
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4
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Bedolla A, Mckinsey G, Ware K, Santander N, Arnold T, Luo Y. Finding the right tool: a comprehensive evaluation of microglial inducible cre mouse models. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.04.17.536878. [PMID: 37131606 PMCID: PMC10153116 DOI: 10.1101/2023.04.17.536878] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The recent proliferation of new Cre and CreER recombinase lines provides researchers with a diverse toolkit to study microglial gene function. To determine how best to apply these lines in studies of microglial gene function, a thorough and detailed comparison of their properties is needed. Here, we examined four different microglial CreER lines (Cx3cr1CreER(Litt), Cx3cr1CreER(Jung), P2ry12CreER, Tmem119CreER), focusing on (1) recombination specificity; (2) leakiness - degree of non-tamoxifen recombination in microglia and other cells; (3) efficiency of tamoxifen-induced recombination; (4) extra-neural recombination -the degree of recombination in cells outside the CNS, particularly myelo/monocyte lineages (5) off-target effects in the context of neonatal brain development. We identify important caveats and strengths for these lines which will provide broad significance for researchers interested in performing conditional gene deletion in microglia. We also provide data emphasizing the potential of these lines for injury models that result in the recruitment of splenic immune cells.
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Affiliation(s)
- Alicia Bedolla
- Department of Molecular and Cellular Biosciences, University of Cincinnati, Cincinnati, OH 45229, USA
- Neuroscience Graduate Program, University of Cincinnati, Cincinnati, OH 45229, USA
| | - Gabriel Mckinsey
- Department of Pediatrics, University of California San Francisco, San Francisco, CA 94143, USA
- Cardiovascular Research Institute, University of California San Francisco, San Francisco, CA 94158, USA
| | - Kierra Ware
- Department of Molecular and Cellular Biosciences, University of Cincinnati, Cincinnati, OH 45229, USA
| | - Nicolas Santander
- Instituto de Ciencias de la Salud, Universidad de O´Higgins, Rancagua, Chile
| | - Thomas Arnold
- Department of Pediatrics, University of California San Francisco, San Francisco, CA 94143, USA
- Cardiovascular Research Institute, University of California San Francisco, San Francisco, CA 94158, USA
| | - Yu Luo
- Department of Molecular and Cellular Biosciences, University of Cincinnati, Cincinnati, OH 45229, USA
- Neuroscience Graduate Program, University of Cincinnati, Cincinnati, OH 45229, USA
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5
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Al-Tawarah NM, Al-Dmour RH, Abu Hajleh MN, Khleifat KM, Alqaraleh M, Al-Saraireh YM, Jaradat AQ, Al-Dujaili EAS. Rosmarinus officinalis and Mentha piperita Oils Supplementation Enhances Memory in a Rat Model of Scopolamine-Induced Alzheimer's Disease-like Condition. Nutrients 2023; 15:nu15061547. [PMID: 36986277 PMCID: PMC10056489 DOI: 10.3390/nu15061547] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 03/18/2023] [Accepted: 03/19/2023] [Indexed: 03/30/2023] Open
Abstract
Alzheimer's disease is regarded as a common neurodegenerative disease that may lead to dementia and the loss of memory. We report here the nootropic and anti-amnesic effects of both peppermint and rosemary oils using a rat model of scopolamine-induced amnesia-like AD. Rats were administered orally with two doses (50 and 100 mg/kg) of each single oil and combined oils. The positive group used donepezil (1 mg/kg). In the therapeutic phase, rats were administered scopolamine (1 mg/kg) through the oral administration of oils. During the nootropic phase, both oils showed a significant (p < 0.05) decrease in radial arm maze latency times, working memory, and reference memory errors compared with the normal group, along with significant (p < 0.05) enhancements of long-term memory during the passive avoidance test. Therapeutic phase results revealed significant enhancements of memory processing compared with the positive groups. In the hippocampus, oils exhibited an elevation of BDNF levels in a dose-dependent manner. Immunohistochemistry findings showed increased hippocampal neurogenesis suppressed by scopolamine in the sub-granular zone, and the anti-amnesic activity of single oil was enhanced when the two oils combined. Gas chromatography-mass spectrometry (GCMS) of the two oils revealed sufficient compounds (1,8-Cineole, α-Pinene, menthol and menthone) with potential efficacy in the memory process and cognitive defects. Our work suggests that both oils could enhance the performance of working and spatial memory, and when combined, more anti-amnesic activity was produced. A potential enhancement of hippocampal growth and neural plasticity was apparent with possible therapeutic activity to boost memory in AD patients.
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Affiliation(s)
- Nafe M Al-Tawarah
- Department of Medical Laboratory Sciences, Faculty of Science, Mutah University, Al-Karak 61710, Jordan
| | - Rawand H Al-Dmour
- Department of Medical Laboratory Sciences, Faculty of Science, Mutah University, Al-Karak 61710, Jordan
| | - Maha N Abu Hajleh
- Department of Cosmetic Science, Pharmacological and Diagnostic Research Centre, Faculty of Allied Medical Sciences, Al-Ahliyya Amman University, Amman 19328, Jordan
| | - Khaled M Khleifat
- Department of Medical Laboratory Sciences, Faculty of Science, Mutah University, Al-Karak 61710, Jordan
| | - Moath Alqaraleh
- Pharmacological and Diagnostic Research Center (PDRC), Faculty of Pharmacy, Al-Ahliyya Amman University, Amman 19328, Jordan
| | | | - Ahmad Q Jaradat
- Department of Medical Laboratory Sciences, Faculty of Science, Mutah University, Al-Karak 61710, Jordan
| | - Emad A S Al-Dujaili
- Centre for Cardiovascular Science, Queen's Medical Research Institute, University of Edinburgh, Edinburgh EH8 9YL, UK
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6
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Willis EF, Gillespie ER, Guse K, Zuercher AW, Käsermann F, Ruitenberg MJ, Vukovic J. Intravenous immunoglobulin (IVIG) promotes brain repair and improves cognitive outcomes after traumatic brain injury in a FcγRIIB receptor-dependent manner. Brain Behav Immun 2023; 109:37-50. [PMID: 36581304 DOI: 10.1016/j.bbi.2022.12.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 12/13/2022] [Accepted: 12/23/2022] [Indexed: 12/27/2022] Open
Abstract
Intravenous immunoglobulin (IVIG) is a promising immune-modulatory therapy for limiting harmful inflammation and associated secondary tissue loss in neurotrauma. Here, we show that IVIG therapy attenuates spatial learning and memory deficits following a controlled cortical impact mouse model of traumatic brain injury (TBI). These improvements in cognitive outcomes were associated with increased neuronal survival, an overall reduction in brain tissue loss, and a greater preservation of neural connectivity. Furthermore, we demonstrate that the presence of the main inhibitory FcγRIIB receptor is required for the beneficial effects of IVIG treatment in TBI, with our results simultaneously highlighting the role of this receptor in reducing secondary damage arising from brain injury.
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Affiliation(s)
- Emily F Willis
- School of Biomedical Sciences, University of Queensland, Brisbane, Queensland, Australia
| | - Ellen R Gillespie
- School of Biomedical Sciences, University of Queensland, Brisbane, Queensland, Australia
| | - Kirsten Guse
- CSL Behring, Research, CSL Biologics Research Center, Bern, Switzerland
| | - Adrian W Zuercher
- CSL Behring, Research, CSL Biologics Research Center, Bern, Switzerland
| | - Fabian Käsermann
- CSL Behring, Research, CSL Biologics Research Center, Bern, Switzerland
| | - Marc J Ruitenberg
- School of Biomedical Sciences, University of Queensland, Brisbane, Queensland, Australia
| | - Jana Vukovic
- School of Biomedical Sciences, University of Queensland, Brisbane, Queensland, Australia; Queensland Brain Institute, University of Queensland, Brisbane, Queensland, Australia.
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7
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Zhao M, Su HZ, Zeng YH, Sun Y, Guo XX, Li YL, Wang C, Zhao ZY, Huang XJ, Lin KJ, Ye ZL, Lin BW, Hong S, Zheng J, Liu YB, Yao XP, Yang D, Lu YQ, Chen HZ, Zuo E, Yang G, Wang HT, Huang CW, Lin XH, Cen Z, Lai LL, Zhang YK, Li X, Lai T, Lin J, Zuo DD, Lin MT, Liou CW, Kong QX, Yan CZ, Xiong ZQ, Wang N, Luo W, Zhao CP, Cheng X, Chen WJ. Loss of function of CMPK2 causes mitochondria deficiency and brain calcification. Cell Discov 2022; 8:128. [DOI: 10.1038/s41421-022-00475-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 09/24/2022] [Indexed: 11/30/2022] Open
Abstract
AbstractBrain calcification is a critical aging-associated pathology and can cause multifaceted neurological symptoms. Cerebral phosphate homeostasis dysregulation, blood-brain barrier defects, and immune dysregulation have been implicated as major pathological processes in familial brain calcification (FBC). Here, we analyzed two brain calcification families and identified calcification co-segregated biallelic variants in the CMPK2 gene that disrupt mitochondrial functions. Transcriptome analysis of peripheral blood mononuclear cells (PBMCs) isolated from these patients showed impaired mitochondria-associated metabolism pathways. In situ hybridization and single-cell RNA sequencing revealed robust Cmpk2 expression in neurons and vascular endothelial cells (vECs), two cell types with high energy expenditure in the brain. The neurons in Cmpk2-knockout (KO) mice have fewer mitochondrial DNA copies, down-regulated mitochondrial proteins, reduced ATP production, and elevated intracellular inorganic phosphate (Pi) level, recapitulating the mitochondrial dysfunction observed in the PBMCs isolated from the FBC patients. Morphologically, the cristae architecture of the Cmpk2-KO murine neurons was also impaired. Notably, calcification developed in a progressive manner in the homozygous Cmpk2-KO mice thalamus region as well as in the Cmpk2-knock-in mice bearing the patient mutation, thus phenocopying the calcification pathology observed in the patients. Together, our study identifies biallelic variants of CMPK2 as novel genetic factors for FBC; and demonstrates how CMPK2 deficiency alters mitochondrial structures and functions, thereby highlighting the mitochondria dysregulation as a critical pathogenic mechanism underlying brain calcification.
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8
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Willis EF, MacDonald KPA, Nguyen QH, Garrido AL, Gillespie ER, Harley SBR, Bartlett PF, Schroder WA, Yates AG, Anthony DC, Rose-John S, Ruitenberg MJ, Vukovic J. Repopulating Microglia Promote Brain Repair in an IL-6-Dependent Manner. Cell 2020; 180:833-846.e16. [PMID: 32142677 DOI: 10.1016/j.cell.2020.02.013] [Citation(s) in RCA: 250] [Impact Index Per Article: 62.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Revised: 11/21/2019] [Accepted: 02/05/2020] [Indexed: 12/20/2022]
Abstract
Cognitive dysfunction and reactive microglia are hallmarks of traumatic brain injury (TBI), yet whether these cells contribute to cognitive deficits and secondary inflammatory pathology remains poorly understood. Here, we show that removal of microglia from the mouse brain has little effect on the outcome of TBI, but inducing the turnover of these cells through either pharmacologic or genetic approaches can yield a neuroprotective microglial phenotype that profoundly aids recovery. The beneficial effects of these repopulating microglia are critically dependent on interleukin-6 (IL-6) trans-signaling via the soluble IL-6 receptor (IL-6R) and robustly support adult neurogenesis, specifically by augmenting the survival of newborn neurons that directly support cognitive function. We conclude that microglia in the mammalian brain can be manipulated to adopt a neuroprotective and pro-regenerative phenotype that can aid repair and alleviate the cognitive deficits arising from brain injury.
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Affiliation(s)
- Emily F Willis
- School of Biomedical Sciences, Faculty of Medicine, The University of Queensland, Brisbane, QLD, Australia; Queensland Brain Institute, The University of Queensland, Brisbane, QLD, Australia
| | - Kelli P A MacDonald
- Department of Immunology, QIMR Berghofer Medical Research Institute, Brisbane, QLD, Australia
| | - Quan H Nguyen
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, Australia
| | - Adahir Labrador Garrido
- School of Biomedical Sciences, Faculty of Medicine, The University of Queensland, Brisbane, QLD, Australia
| | - Ellen R Gillespie
- School of Biomedical Sciences, Faculty of Medicine, The University of Queensland, Brisbane, QLD, Australia
| | - Samuel B R Harley
- School of Biomedical Sciences, Faculty of Medicine, The University of Queensland, Brisbane, QLD, Australia; Queensland Brain Institute, The University of Queensland, Brisbane, QLD, Australia
| | - Perry F Bartlett
- Queensland Brain Institute, The University of Queensland, Brisbane, QLD, Australia
| | - Wayne A Schroder
- Department of Immunology, QIMR Berghofer Medical Research Institute, Brisbane, QLD, Australia; School of Environment and Science, Griffith University, QLD, Brisbane, Australia
| | - Abi G Yates
- Laboratory of Experimental Neuropathology, Department of Pharmacology, University of Oxford, Oxford OX1 3QT, UK
| | - Daniel C Anthony
- Laboratory of Experimental Neuropathology, Department of Pharmacology, University of Oxford, Oxford OX1 3QT, UK
| | - Stefan Rose-John
- Biochemisches Institut, Christian Albrechts Universität Kiel, Kiel, Germany
| | - Marc J Ruitenberg
- School of Biomedical Sciences, Faculty of Medicine, The University of Queensland, Brisbane, QLD, Australia
| | - Jana Vukovic
- School of Biomedical Sciences, Faculty of Medicine, The University of Queensland, Brisbane, QLD, Australia; Queensland Brain Institute, The University of Queensland, Brisbane, QLD, Australia.
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9
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Littlejohn EL, Scott D, Saatman KE. Insulin-like growth factor-1 overexpression increases long-term survival of posttrauma-born hippocampal neurons while inhibiting ectopic migration following traumatic brain injury. Acta Neuropathol Commun 2020; 8:46. [PMID: 32276671 PMCID: PMC7147070 DOI: 10.1186/s40478-020-00925-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Accepted: 03/29/2020] [Indexed: 01/29/2023] Open
Abstract
Cellular damage associated with traumatic brain injury (TBI) manifests in motor and cognitive dysfunction following injury. Experimental models of TBI reveal cell death in the granule cell layer (GCL) of the hippocampal dentate gyrus acutely after injury. Adult-born neurons residing in the neurogenic niche of the GCL, the subgranular zone, are particularly vulnerable. Injury-induced proliferation of neural progenitors in the subgranular zone supports recovery of the immature neuron population, but their development and localization may be altered, potentially affecting long-term survival. Here we show that increasing hippocampal levels of insulin-like growth factor-1 (IGF1) is sufficient to promote end-stage maturity of posttrauma-born neurons and improve cognition following TBI. Mice with conditional overexpression of astrocyte-specific IGF1 and wild-type mice received controlled cortical impact or sham injury and bromo-2'-deoxyuridine injections for 7d after injury to label proliferating cells. IGF1 overexpression increased the number of GCL neurons born acutely after trauma that survived 6 weeks to maturity (NeuN+BrdU+), and enhanced their outward migration into the GCL while significantly reducing the proportion localized ectopically to the hilus and molecular layer. IGF1 selectively affected neurons, without increasing the persistence of posttrauma-proliferated glia in the dentate gyrus. IGF1 overexpressing animals performed better during radial arm water maze reversal testing, a neurogenesis-dependent cognitive test. These findings demonstrate the ability of IGF1 to promote the long-term survival and appropriate localization of granule neurons born acutely after a TBI, and suggest these new neurons contribute to improved cognitive function.
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Affiliation(s)
- Erica L. Littlejohn
- grid.266539.d0000 0004 1936 8438Spinal Cord and Brain Injury Research Center, Department of Physiology, University of Kentucky, B473 Biomedical & Biological Sciences Research Building (BBSRB), 741 South Limestone St, Lexington, KY 40536-0509 USA ,grid.267309.90000 0001 0629 5880Department of Cellular and Integrative Physiology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229-3901 USA
| | - Danielle Scott
- grid.266539.d0000 0004 1936 8438Spinal Cord and Brain Injury Research Center, Department of Physiology, University of Kentucky, B473 Biomedical & Biological Sciences Research Building (BBSRB), 741 South Limestone St, Lexington, KY 40536-0509 USA
| | - Kathryn E. Saatman
- grid.266539.d0000 0004 1936 8438Spinal Cord and Brain Injury Research Center, Department of Physiology, University of Kentucky, B473 Biomedical & Biological Sciences Research Building (BBSRB), 741 South Limestone St, Lexington, KY 40536-0509 USA ,grid.266539.d0000 0004 1936 8438Department of Physiology, College of Medicine, University of Kentucky, Lexington, KY 40536 USA
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10
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Early detonation by sprouted mossy fibers enables aberrant dentate network activity. Proc Natl Acad Sci U S A 2019; 116:10994-10999. [PMID: 31085654 DOI: 10.1073/pnas.1821227116] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
In temporal lobe epilepsy, sprouting of hippocampal mossy fiber axons onto dentate granule cell dendrites creates a recurrent excitatory network. However, unlike mossy fibers projecting to CA3, sprouted mossy fiber synapses depress upon repetitive activation. Thus, despite their proximal location, relatively large presynaptic terminals, and ability to excite target neurons, the impact of sprouted mossy fiber synapses on hippocampal hyperexcitability is unclear. We find that despite their short-term depression, single episodes of sprouted mossy fiber activation in hippocampal slices initiated bursts of recurrent polysynaptic excitation. Consistent with a contribution to network hyperexcitability, optogenetic activation of sprouted mossy fibers reliably triggered action potential firing in postsynaptic dentate granule cells after single light pulses. This pattern resulted in a shift in network recruitment dynamics to an "early detonation" mode and an increased probability of release compared with mossy fiber synapses in CA3. A lack of tonic adenosine-mediated inhibition contributed to the higher probability of glutamate release, thus facilitating reverberant circuit activity.
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Zalucki O, Harris L, Harvey TJ, Harkins D, Widagdo J, Oishi S, Matuzelski E, Yong XLH, Schmidt H, Anggono V, Burne THJ, Gronostajski RM, Piper M. NFIX-Mediated Inhibition of Neuroblast Branching Regulates Migration Within the Adult Mouse Ventricular–Subventricular Zone. Cereb Cortex 2018; 29:3590-3604. [DOI: 10.1093/cercor/bhy233] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2018] [Revised: 08/26/2018] [Accepted: 08/29/2018] [Indexed: 12/13/2022] Open
Abstract
Abstract
Understanding the migration of newborn neurons within the brain presents a major challenge in contemporary biology. Neuronal migration is widespread within the developing brain but is also important within the adult brain. For instance, stem cells within the ventricular–subventricular zone (V-SVZ) and the subgranular zone of dentate gyrus of the adult rodent brain produce neuroblasts that migrate to the olfactory bulb and granule cell layer of the dentate gyrus, respectively, where they regulate key brain functions including innate olfactory responses, learning, and memory. Critically, our understanding of the factors mediating neuroblast migration remains limited. The transcription factor nuclear factor I X (NFIX) has previously been implicated in embryonic cortical development. Here, we employed conditional ablation of Nfix from the adult mouse brain and demonstrated that the removal of this gene from either neural stem and progenitor cells, or neuroblasts, within the V-SVZ culminated in neuroblast migration defects. Mechanistically, we identified aberrant neuroblast branching, due in part to increased expression of the guanylyl cyclase natriuretic peptide receptor 2 (Npr2), as a factor contributing to abnormal migration in Nfix-deficient adult mice. Collectively, these data provide new insights into how neuroblast migration is regulated at a transcriptional level within the adult brain.
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Affiliation(s)
- Oressia Zalucki
- The School of Biomedical Sciences, The University of Queensland, Brisbane, QLD, Australia
| | - Lachlan Harris
- The School of Biomedical Sciences, The University of Queensland, Brisbane, QLD, Australia
| | - Tracey J Harvey
- The School of Biomedical Sciences, The University of Queensland, Brisbane, QLD, Australia
| | - Danyon Harkins
- The School of Biomedical Sciences, The University of Queensland, Brisbane, QLD, Australia
| | - Jocelyn Widagdo
- Queensland Brain Institute, The University of Queensland, Brisbane, QLD, Australia
- Clem Jones Centre for Ageing Dementia Research, The University of Queensland, Brisbane, QLD, Australia
| | - Sabrina Oishi
- The School of Biomedical Sciences, The University of Queensland, Brisbane, QLD, Australia
| | - Elise Matuzelski
- The School of Biomedical Sciences, The University of Queensland, Brisbane, QLD, Australia
| | - Xuan Ling Hilary Yong
- Queensland Brain Institute, The University of Queensland, Brisbane, QLD, Australia
- Clem Jones Centre for Ageing Dementia Research, The University of Queensland, Brisbane, QLD, Australia
| | - Hannes Schmidt
- Interfaculty Institute of Biochemistry, University of Tübingen, Tübingen, Germany
| | - Victor Anggono
- Queensland Brain Institute, The University of Queensland, Brisbane, QLD, Australia
- Clem Jones Centre for Ageing Dementia Research, The University of Queensland, Brisbane, QLD, Australia
| | - Thomas H J Burne
- Queensland Brain Institute, The University of Queensland, Brisbane, QLD, Australia
- Queensland Centre for Mental Health Research, The Park Centre for Mental Health, Wacol, QLD, Australia
| | - Richard M Gronostajski
- Department of Biochemistry, Program in Genetics, Genomics and Bioinformatics, Center of Excellence in Bioinformatics and Life Sciences, State University of New York at Buffalo, Buffalo, NY, USA
| | - Michael Piper
- The School of Biomedical Sciences, The University of Queensland, Brisbane, QLD, Australia
- Queensland Brain Institute, The University of Queensland, Brisbane, QLD, Australia
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12
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Zhao ML, Chen SJ, Li XH, Wang LN, Chen F, Zhong SJ, Yang C, Sun SK, Li JJ, Dong HJ, Dong YQ, Wang Y, Chen C. Optical Depolarization of DCX-Expressing Cells Promoted Cognitive Recovery and Maturation of Newborn Neurons via the Wnt/β-Catenin Pathway. J Alzheimers Dis 2018; 63:303-318. [PMID: 29614674 DOI: 10.3233/jad-180002] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Ming-Liang Zhao
- Tianjin Key Laboratory of Neurotrauma Repair, Pingjin Hospital Brain Center, Logistics University of Chinese People’s Armed Police Forces, Tianjin, China
| | - Shi-Jin Chen
- Department of Cardiology, Yichang Second People’s Hospital, Hubei, China
| | - Xiao-Hong Li
- Tianjin Key Laboratory of Neurotrauma Repair, Pingjin Hospital Brain Center, Logistics University of Chinese People’s Armed Police Forces, Tianjin, China
| | - Li-Na Wang
- Tianjin Key Laboratory of Neurotrauma Repair, Pingjin Hospital Brain Center, Logistics University of Chinese People’s Armed Police Forces, Tianjin, China
| | - Feng Chen
- Tianjin Key Laboratory of Neurotrauma Repair, Pingjin Hospital Brain Center, Logistics University of Chinese People’s Armed Police Forces, Tianjin, China
| | - Shi-Jiang Zhong
- Tianjin Key Laboratory of Neurotrauma Repair, Pingjin Hospital Brain Center, Logistics University of Chinese People’s Armed Police Forces, Tianjin, China
| | - Cheng Yang
- Tianjin Key Laboratory of Neurotrauma Repair, Pingjin Hospital Brain Center, Logistics University of Chinese People’s Armed Police Forces, Tianjin, China
| | - Sheng-Kai Sun
- Tianjin Key Laboratory of Neurotrauma Repair, Pingjin Hospital Brain Center, Logistics University of Chinese People’s Armed Police Forces, Tianjin, China
| | - Jian-Jun Li
- Tianjin Key Laboratory of Neurotrauma Repair, Pingjin Hospital Brain Center, Logistics University of Chinese People’s Armed Police Forces, Tianjin, China
| | - Hua-Jiang Dong
- Tianjin Key Laboratory of Neurotrauma Repair, Pingjin Hospital Brain Center, Logistics University of Chinese People’s Armed Police Forces, Tianjin, China
| | - Yue-Qing Dong
- Tianjin Key Laboratory of Neurotrauma Repair, Pingjin Hospital Brain Center, Logistics University of Chinese People’s Armed Police Forces, Tianjin, China
| | - Yi Wang
- Tianjin Key Laboratory of Neurotrauma Repair, Pingjin Hospital Brain Center, Logistics University of Chinese People’s Armed Police Forces, Tianjin, China
| | - Chong Chen
- Tianjin Key Laboratory of Neurotrauma Repair, Pingjin Hospital Brain Center, Logistics University of Chinese People’s Armed Police Forces, Tianjin, China
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13
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Harris L, Zalucki O, Clément O, Fraser J, Matuzelski E, Oishi S, Harvey TJ, Burne THJ, Heng JIT, Gronostajski RM, Piper M. Neurogenic differentiation by hippocampal neural stem and progenitor cells is biased by NFIX expression. Development 2018; 145:145/3/dev155689. [DOI: 10.1242/dev.155689] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2017] [Accepted: 12/22/2017] [Indexed: 12/29/2022]
Abstract
ABSTRACT
Our understanding of the transcriptional programme underpinning adult hippocampal neurogenesis is incomplete. In mice, under basal conditions, adult hippocampal neural stem cells (AH-NSCs) generate neurons and astrocytes, but not oligodendrocytes. The factors limiting oligodendrocyte production, however, remain unclear. Here, we reveal that the transcription factor NFIX plays a key role in this process. NFIX is expressed by AH-NSCs, and its expression is sharply upregulated in adult hippocampal neuroblasts. Conditional ablation of Nfix from AH-NSCs, coupled with lineage tracing, transcriptomic sequencing and behavioural studies collectively reveal that NFIX is cell-autonomously required for neuroblast maturation and survival. Moreover, a small number of AH-NSCs also develop into oligodendrocytes following Nfix deletion. Remarkably, when Nfix is deleted specifically from intermediate progenitor cells and neuroblasts using a Dcx-creERT2 driver, these cells also display elevated signatures of oligodendrocyte gene expression. Together, these results demonstrate the central role played by NFIX in neuroblasts within the adult hippocampal stem cell neurogenic niche in promoting the maturation and survival of these cells, while concomitantly repressing oligodendrocyte gene expression signatures.
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Affiliation(s)
- Lachlan Harris
- The School of Biomedical Sciences, The University of Queensland, Brisbane, Queensland, Australia 4072
| | - Oressia Zalucki
- The School of Biomedical Sciences, The University of Queensland, Brisbane, Queensland, Australia 4072
| | - Olivier Clément
- Curtin Health Innovation Research Institute, Curtin University, Bentley, Western Australia, Australia 6102
| | - James Fraser
- The School of Biomedical Sciences, The University of Queensland, Brisbane, Queensland, Australia 4072
| | - Elise Matuzelski
- The School of Biomedical Sciences, The University of Queensland, Brisbane, Queensland, Australia 4072
| | - Sabrina Oishi
- The School of Biomedical Sciences, The University of Queensland, Brisbane, Queensland, Australia 4072
| | - Tracey J. Harvey
- The School of Biomedical Sciences, The University of Queensland, Brisbane, Queensland, Australia 4072
| | - Thomas H. J. Burne
- Queensland Brain Institute, The University of Queensland, Brisbane, Australia 4072
- Queensland Centre for Mental Health Research, The Park Centre for Mental Health, Wacol, Queensland, Australia 4076
| | - Julian Ik-Tsen Heng
- Curtin Health Innovation Research Institute, Curtin University, Bentley, Western Australia, Australia 6102
| | - Richard M. Gronostajski
- Department of Biochemistry, Program in Genetics, Genomics and Bioinformatics, Center of Excellence in Bioinformatics and Life Sciences, State University of New York at Buffalo, Buffalo, NY 14203, USA
| | - Michael Piper
- The School of Biomedical Sciences, The University of Queensland, Brisbane, Queensland, Australia 4072
- Queensland Brain Institute, The University of Queensland, Brisbane, Australia 4072
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14
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Huntsman HD, Rendeiro C, Merritt JR, Pincu Y, Cobert A, De Lisio M, Kolyvas E, Dvoretskiy S, Dobrucki IT, Kemkemer R, Jensen T, Dobrucki LW, Rhodes JS, Boppart MD. The impact of mechanically stimulated muscle-derived stromal cells on aged skeletal muscle. Exp Gerontol 2017; 103:35-46. [PMID: 29269268 DOI: 10.1016/j.exger.2017.12.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Revised: 11/16/2017] [Accepted: 12/14/2017] [Indexed: 01/06/2023]
Abstract
Perivascular stromal cells, including mesenchymal stem/stromal cells (MSCs), secrete paracrine factor in response to exercise training that can facilitate improvements in muscle remodeling. This study was designed to test the capacity for muscle-resident MSCs (mMSCs) isolated from young mice to release regenerative proteins in response to mechanical strain in vitro, and subsequently determine the extent to which strain-stimulated mMSCs can enhance skeletal muscle and cognitive performance in a mouse model of uncomplicated aging. Protein arrays confirmed a robust increase in protein release at 24h following an acute bout of mechanical strain in vitro (10%, 1Hz, 5h) compared to non-strain controls. Aged (24month old), C57BL/6 mice were provided bilateral intramuscular injection of saline, non-strain control mMSCs, or mMSCs subjected to a single bout of mechanical strain in vitro (4×104). No significant changes were observed in muscle weight, myofiber size, maximal force, or satellite cell quantity at 1 or 4wks between groups. Peripheral perfusion was significantly increased in muscle at 4wks post-mMSC injection (p<0.05), yet no difference was noted between control and preconditioned mMSCs. Intramuscular injection of preconditioned mMSCs increased the number of new neurons and astrocytes in the dentate gyrus of the hippocampus compared to both control groups (p<0.05), with a trend toward an increase in water maze performance noted (p=0.07). Results from this study demonstrate that acute injection of exogenously stimulated muscle-resident stromal cells do not robustly impact aged muscle structure and function, yet increase the survival of new neurons in the hippocampus.
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Affiliation(s)
- Heather D Huntsman
- Department of Kinesiology and Community Health, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Catarina Rendeiro
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Center for Nutrition, Learning and Memory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
| | - Jennifer R Merritt
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Department of Psychology and Neuroscience Program, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Yair Pincu
- Department of Kinesiology and Community Health, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Adam Cobert
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Department of Psychology and Neuroscience Program, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Michael De Lisio
- Department of Kinesiology and Community Health, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Emily Kolyvas
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Svyatoslav Dvoretskiy
- Department of Kinesiology and Community Health, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Iwona T Dobrucki
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Ralf Kemkemer
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems, Stuttgart, Germany
| | - Tor Jensen
- Division of Biomedical Sciences, Carle Hospital, Urbana, IL 61801, USA
| | - Lawrence W Dobrucki
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Justin S Rhodes
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Center for Nutrition, Learning and Memory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Department of Psychology and Neuroscience Program, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Marni D Boppart
- Department of Kinesiology and Community Health, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Center for Nutrition, Learning and Memory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
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15
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Short-Term Depression of Sprouted Mossy Fiber Synapses from Adult-Born Granule Cells. J Neurosci 2017; 37:5722-5735. [PMID: 28495975 DOI: 10.1523/jneurosci.0761-17.2017] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Revised: 04/25/2017] [Accepted: 05/03/2017] [Indexed: 11/21/2022] Open
Abstract
Epileptic seizures potently modulate hippocampal adult neurogenesis, and adult-born dentate granule cells contribute to the pathologic retrograde sprouting of mossy fiber axons, both hallmarks of temporal lobe epilepsy. The characteristics of these sprouted synapses, however, have been largely unexplored, and the specific contribution of adult-born granule cells to functional mossy fiber sprouting is unknown, primarily due to technical barriers in isolating sprouted mossy fiber synapses for analysis. Here, we used DcxCreERT2 transgenic mice to permanently pulse-label age-defined cohorts of granule cells born either before or after pilocarpine-induced status epilepticus (SE). Using optogenetics, we demonstrate that adult-born granule cells born before SE form functional recurrent monosynaptic excitatory connections with other granule cells. Surprisingly, however, although healthy mossy fiber synapses in CA3 are well characterized "detonator" synapses that potently drive postsynaptic cell firing through their profound frequency-dependent facilitation, sprouted mossy fiber synapses from adult-born cells exhibited profound frequency-dependent depression, despite possessing some of the morphological hallmarks of mossy fiber terminals. Mature granule cells also contributed to functional mossy fiber sprouting, but exhibited less synaptic depression. Interestingly, granule cells born shortly after SE did not form functional excitatory synapses, despite robust sprouting. Our results suggest that, although sprouted mossy fibers form recurrent excitatory circuits with some of the morphological characteristics of typical mossy fiber terminals, the functional characteristics of sprouted synapses would limit the contribution of adult-born granule cells to hippocampal hyperexcitability in the epileptic hippocampus.SIGNIFICANCE STATEMENT In the hippocampal dentate gyrus, seizures drive retrograde sprouting of granule cell mossy fiber axons. We directly activated sprouted mossy fiber synapses from adult-born granule cells to study their synaptic properties. We reveal that sprouted synapses from adult-born granule cells have a diminished ability to sustain recurrent excitation in the epileptic hippocampus, which raises questions about the role of sprouting and adult neurogenesis in sustaining seizure-like activity.
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16
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Yang Z, Li PF, Chen RC, Wang J, Wang S, Shen Y, Wu X, Fang B, Cheng X, Xiong ZQ. ADAM10-Initiated Release of Notch Intracellular Domain Regulates Microtubule Stability and Radial Migration of Cortical Neurons. Cereb Cortex 2017; 27:919-932. [PMID: 28158408 PMCID: PMC6093323 DOI: 10.1093/cercor/bhx006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2016] [Indexed: 11/24/2022] Open
Abstract
Proper neuronal migration is orchestrated by combined membrane signal paradigms, whereas the role and mechanism of regulated intramembrane proteolysis (RIP) remain to be illustrated. We show here that the disintegrin and metalloprotease-domain containing protein 10 (ADAM10) regulates cortical neurons migration by initiating the RIP of Notch. We found that Notch intracellular domain (NICD) significantly rescued the migration defect of ADAM10-deficient neurons. Moreover, ADAM10 deficiency led to reduced neuronal motility and disrupted microtubule (MT) structure, which were associated with downregulated expression of acetylated tubulin and MT-associated proteins. Specifically, the NICD/RBPJ complex bound directly to the promoter, and regulated the neuronal expression level of doublecortin (DCX), a modulator of the MT cytoskeleton. Functionally, DCX overexpression largely restored neuron motility and reversed migration defect caused by ADAM10 knockout. Taken together, these findings demonstrate the direct requirement of ADAM10 in cortical radial migration and reveal the underlying mechanism by linking ADAM10-initiated RIP of Notch to the regulation of MT cytoskeleton through transcriptional control of Dcx expression.
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Affiliation(s)
- Zhi Yang
- Institute of Neuroscience, State Key Laboratory of Neuroscience, CAS Center for Excellence in Brain Science and Intelligence Technology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China.,Shanghai Key Laboratory of Stomatology, Department of Oral and Cranio-Maxillofacial Science, Shanghai Ninth People's Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai 200011, China
| | - Peng-Fei Li
- Institute of Neuroscience, State Key Laboratory of Neuroscience, CAS Center for Excellence in Brain Science and Intelligence Technology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ren-Chao Chen
- Institute of Neuroscience, State Key Laboratory of Neuroscience, CAS Center for Excellence in Brain Science and Intelligence Technology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Jie Wang
- Institute of Neuroscience, State Key Laboratory of Neuroscience, CAS Center for Excellence in Brain Science and Intelligence Technology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shaoran Wang
- Institute of Neuroscience, State Key Laboratory of Neuroscience, CAS Center for Excellence in Brain Science and Intelligence Technology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ya Shen
- Institute of Neuroscience, State Key Laboratory of Neuroscience, CAS Center for Excellence in Brain Science and Intelligence Technology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Xiaohui Wu
- Institute of Developmental Biology and Molecular Medicine, School of Life Science, Fudan University, Shanghai 200433, China
| | - Bing Fang
- Shanghai Key Laboratory of Stomatology, Department of Oral and Cranio-Maxillofacial Science, Shanghai Ninth People's Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai 200011, China
| | - Xuewen Cheng
- Institute of Neuroscience, State Key Laboratory of Neuroscience, CAS Center for Excellence in Brain Science and Intelligence Technology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhi-Qi Xiong
- Institute of Neuroscience, State Key Laboratory of Neuroscience, CAS Center for Excellence in Brain Science and Intelligence Technology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China.,University of Chinese Academy of Sciences, Beijing 100049, China
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17
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Song S, Kong X, Acosta S, Sava V, Borlongan C, Sanchez-Ramos J. Granulocyte-colony stimulating factor promotes brain repair following traumatic brain injury by recruitment of microglia and increasing neurotrophic factor expression. Restor Neurol Neurosci 2016; 34:415-31. [DOI: 10.3233/rnn-150607] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Shijie Song
- James A Haley VAH Research Service, Tampa FL, USA
- Department of Neurology, University of South Florida, Tampa, FL, USA
| | - Xiaoyuan Kong
- James A Haley VAH Research Service, Tampa FL, USA
- Department of Neurosurgery, University of South Florida, Tampa, FL, USA
| | - Sandra Acosta
- Department of Neurosurgery, University of South Florida, Tampa, FL, USA
| | - Vasyl Sava
- James A Haley VAH Research Service, Tampa FL, USA
- Department of Neurology, University of South Florida, Tampa, FL, USA
| | - Cesar Borlongan
- Department of Neurosurgery, University of South Florida, Tampa, FL, USA
| | - Juan Sanchez-Ramos
- James A Haley VAH Research Service, Tampa FL, USA
- Department of Neurology, University of South Florida, Tampa, FL, USA
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18
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Song S, Kong X, Acosta S, Sava V, Borlongan C, Sanchez-Ramos J. Granulocyte colony-stimulating factor promotes behavioral recovery in a mouse model of traumatic brain injury. J Neurosci Res 2016; 94:409-23. [PMID: 26822127 DOI: 10.1002/jnr.23714] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Revised: 01/05/2016] [Accepted: 01/06/2016] [Indexed: 01/19/2023]
Abstract
Hematopoietic growth factors such as granulocyte colony-stimulating factor (G-CSF) represent a novel approach for treatment of traumatic brain injury (TBI). After mild controlled cortical impact (CCI), mice were treated with G-CSF (100 μg/kg) for 3 consecutive days. The primary behavioral endpoint was performance on the radial arm water maze (RAWM), assessed 7 and 14 days after CCI. Secondary endpoints included 1) motor performance on a rotating cylinder (rotarod), 2) measurement of microglial and astroglial response, 3) hippocampal neurogenesis, and 4) measures of neurotrophic factors (brain-derived neurotrophic factor [BDNF] and glial cell line-derived neurotrophic factor [GDNF]) and cytokines in brain homogenates. G-CSF-treated animals performed significantly better than vehicle-treated mice in the RAWM at 1 and 2 weeks but not on the rotarod. Cellular changes found in the G-CSF group included increased hippocampal neurogenesis as well as astrocytosis and microgliosis in both the striatum and the hippocampus. Neurotrophic factors GDNF and BDNF, elaborated by activated microglia and astrocytes, were increased in G-CSF-treated mice. These factors along with G-CSF itself are known to promote hippocampal neurogenesis and inhibit apoptosis and likely contributed to improvement in the hippocampal-dependent learning task. Six cytokines that were modulated by G-CSF treatment following CCI were elevated on day 3, but only one of them remained altered by day 7, and all of them were no different from vehicle controls by day 14. The pro- and anti-inflammatory cytokines modulated by G-CSF administration interact in a complex and incompletely understood network involving both damage and recovery processes, underscoring the dual role of inflammation after TBI.
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Affiliation(s)
- Shijie Song
- James Haley Veterans Administration Research Service, Tampa, Florida.,Department of Neurology, University of South Florida, Tampa, Florida
| | - Xiaoyuan Kong
- James Haley Veterans Administration Research Service, Tampa, Florida.,Department of Neurosurgery and Brain Repair, University of South Florida, Tampa, Florida
| | - Sandra Acosta
- Department of Neurosurgery and Brain Repair, University of South Florida, Tampa, Florida
| | - Vasyl Sava
- James Haley Veterans Administration Research Service, Tampa, Florida.,Department of Neurosurgery and Brain Repair, University of South Florida, Tampa, Florida
| | - Cesar Borlongan
- Department of Neurology, University of South Florida, Tampa, Florida
| | - Juan Sanchez-Ramos
- James Haley Veterans Administration Research Service, Tampa, Florida.,Department of Neurosurgery and Brain Repair, University of South Florida, Tampa, Florida
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19
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Willenberg R, Steward O. Nonspecific labeling limits the utility of Cre-Lox bred CST-YFP mice for studies of corticospinal tract regeneration. J Comp Neurol 2015; 523:2665-82. [PMID: 25976033 PMCID: PMC4607560 DOI: 10.1002/cne.23809] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2014] [Revised: 05/10/2015] [Accepted: 05/12/2015] [Indexed: 12/20/2022]
Abstract
Studies of axon regeneration in the spinal cord often assess regeneration of the corticospinal tract (CST). Emx1-Cre x Thy1-STOP-YFP mice have been reported to have yellow fluorescent protein (YFP) selectively expressed in forebrain neurons leading to genetic labeling of CST axons in the spinal cord, and it was suggested that these CST-YFP mice would be useful for studies of CST regeneration. Because regeneration past a lesion may involve only a few axons, the presence of labeled non-CST axons compromises interpretation. We show here that in CST-YFP mice, some YFP-labeled axons are not from the CST. Specifically, YFP-labeled axons are present in regions beyond those with anterogradely labeled CST axons, most YFP-labeled axons beyond established CST locations do not undergo Wallerian degeneration following a large lesion of the sensorimotor cortex, some rubrospinal and reticulospinal neurons are labeled with YFP, and some YFP-labeled cells in the spinal gray matter have YFP-labeled projections into the spinal cord white matter. We further demonstrate that the density of YFP-labeled axon arbors hinders tracing of single axons to their point of origin in the main descending tracts. In light of recent advances in 3D imaging for visualizing axons in unsectioned blocks of spinal cord, we also assessed CST-YFP mice for 3D imaging and found that YFP fluorescence in CST-YFP mice is faint for clearing-based 3D imaging in comparison with fluorescence in Thy1-YFP-H mice and fluorescence of mini-ruby biotinylated dextran amine (BDA). Overall, the nonspecific and faint YFP labeling in CST-YFP mice limits their utility for assessments of CST axon regeneration.
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Affiliation(s)
- Rafer Willenberg
- Reeve-Irvine Research Center, University of California at Irvine, Irvine, California 92697
- Department of Anatomy & Neurobiology, University of California at Irvine, Irvine, California 92697
| | - Oswald Steward
- Reeve-Irvine Research Center, University of California at Irvine, Irvine, California 92697
- Department of Anatomy & Neurobiology, University of California at Irvine, Irvine, California 92697
- Department of Neurobiology & Behavior, University of California at Irvine, Irvine, California 92697
- Department of Neurosurgery, University of California at Irvine, Irvine, California 92697
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20
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Functional Integration of Adult-Born Hippocampal Neurons after Traumatic Brain Injury(1,2,3). eNeuro 2015; 2:eN-NWR-0056-15. [PMID: 26478908 PMCID: PMC4603252 DOI: 10.1523/eneuro.0056-15.2015] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2015] [Revised: 07/24/2015] [Accepted: 07/31/2015] [Indexed: 01/31/2023] Open
Abstract
Traumatic brain injury (TBI) increases hippocampal neurogenesis, which may contribute to cognitive recovery after injury. However, it is unknown whether TBI-induced adult-born neurons mature normally and functionally integrate into the hippocampal network. We assessed the generation, morphology, and synaptic integration of new hippocampal neurons after a controlled cortical impact (CCI) injury model of TBI. To label TBI-induced newborn neurons, we used 2-month-old POMC-EGFP mice, which transiently and specifically express EGFP in immature hippocampal neurons, and doublecortin-CreERT2 transgenic mice crossed with Rosa26-CAG-tdTomato reporter mice, to permanently pulse-label a cohort of adult-born hippocampal neurons. TBI increased the generation, outward migration, and dendritic complexity of neurons born during post-traumatic neurogenesis. Cells born after TBI had profound alterations in their dendritic structure, with increased dendritic branching proximal to the soma and widely splayed dendritic branches. These changes were apparent during early dendritic outgrowth and persisted as these cells matured. Whole-cell recordings from neurons generated during post-traumatic neurogenesis demonstrate that they are excitable and functionally integrate into the hippocampal circuit. However, despite their dramatic morphologic abnormalities, we found no differences in the rate of their electrophysiological maturation, or their overall degree of synaptic integration when compared to age-matched adult-born cells from sham mice. Our results suggest that cells born after TBI participate in information processing, and receive an apparently normal balance of excitatory and inhibitory inputs. However, TBI-induced changes in their anatomic localization and dendritic projection patterns could result in maladaptive network properties.
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21
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Song J, Kang SM, Kim E, Kim CH, Song HT, Lee JE. Adiponectin receptor-mediated signaling ameliorates cerebral cell damage and regulates the neurogenesis of neural stem cells at high glucose concentrations: an in vivo and in vitro study. Cell Death Dis 2015; 6:e1844. [PMID: 26247729 PMCID: PMC4558511 DOI: 10.1038/cddis.2015.220] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Revised: 07/03/2015] [Accepted: 07/06/2015] [Indexed: 01/06/2023]
Abstract
In the central nervous system (CNS), hyperglycemia leads to neuronal damage and cognitive decline. Recent research has focused on revealing alterations in the brain in hyperglycemia and finding therapeutic solutions for alleviating the hyperglycemia-induced cognitive dysfunction. Adiponectin is a protein hormone with a major regulatory role in diabetes and obesity; however, its role in the CNS has not been studied yet. Although the presence of adiponectin receptors has been reported in the CNS, adiponectin receptor-mediated signaling in the CNS has not been investigated. In the present study, we investigated adiponectin receptor (AdipoR)-mediated signaling in vivo using a high-fat diet and in vitro using neural stem cells (NSCs). We showed that AdipoR1 protects cell damage and synaptic dysfunction in the mouse brain in hyperglycemia. At high glucose concentrations in vitro, AdipoR1 regulated the survival of NSCs through the p53/p21 pathway and the proliferation- and differentiation-related factors of NSCs via tailless (TLX). Hence, we suggest that further investigations are necessary to understand the cerebral AdipoR1-mediated signaling in hyperglycemic conditions, because the modulation of AdipoR1 might alleviate hyperglycemia-induced neuropathogenesis.
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Affiliation(s)
- J Song
- Department of Anatomy, Yonsei University College of Medicine, Seoul 120-752, South Korea
| | - S M Kang
- 1] Department of Anatomy, Yonsei University College of Medicine, Seoul 120-752, South Korea [2] BK21 Plus Project for Medical Sciences and Brain Research Institute, Yonsei University College of Medicine, Seoul 120-752, South Korea
| | - E Kim
- Department of Psychiatry, Yonsei University College of Medicine, Seoul 120-752, South Korea
| | - C-H Kim
- Department of Pharmacology, Yonsei University College of Medicine, Seoul 120-752, South Korea
| | - H-T Song
- Department of Diagnostic Radiology, Yonsei University College of Medicine, Seoul 120-752, South Korea
| | - J E Lee
- 1] Department of Anatomy, Yonsei University College of Medicine, Seoul 120-752, South Korea [2] BK21 Plus Project for Medical Sciences and Brain Research Institute, Yonsei University College of Medicine, Seoul 120-752, South Korea
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Enikolopov G, Overstreet-Wadiche L, Ge S. Viral and transgenic reporters and genetic analysis of adult neurogenesis. Cold Spring Harb Perspect Biol 2015; 7:a018804. [PMID: 26238354 DOI: 10.1101/cshperspect.a018804] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Stem and progenitor cells of the developing and adult brain can be effectively identified and manipulated using reporter genes, introduced into transgenic reporter mouse lines or recombinant viruses. Such reporters rely on an ever-increasing variety of fluorescent proteins and a continuously expanding list of regulatory elements and of mouse lines engineered for cell- or time-specific recombination. An important extension of stem-cell-based genetic strategies is an opportunity to explore the properties of newly generated neurons and their contribution to synaptic plasticity. Here, we review available strategies for marking and quantifying various classes of stem and progenitor cells in the adult brain, genetically tracing their progeny, and studying the properties of stem cells and new neurons. We compare various experimental approaches to labeling and investigating stem cells and their progeny and discuss caveats and limitations inherent to each approach.
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Affiliation(s)
| | | | - Shaoyu Ge
- Department of Neurobiology and Behavior, Stony Brook University, Stony Brook, New York 11794
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Zhang L, Li H, Zeng S, Chen L, Fang Z, Huang Q. Long-term tracing of the BrdU label-retaining cells in adult rat brain. Neurosci Lett 2015; 591:30-34. [PMID: 25681624 DOI: 10.1016/j.neulet.2015.02.023] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Revised: 01/17/2015] [Accepted: 02/10/2015] [Indexed: 02/05/2023]
Abstract
Stem cells have been shown to be label-retaining, slow-cycling cells. In the adult mammalian central nervous system, the distribution of the stem cells is inconsistent among previous studies. The purpose of the present study was to determine the distribution of BrdU-LRCs and the cell types of the BrdU-LRCs in rat brain. To label BrdU-LRCs in rat brain, six newborn rats were administered intraperitoneal injections of BrdU 50mg/kg/time twice a day at 2h intervals, over four consecutive days. The BrdU-LRCs were detected by immunohistochemistry, the cell types were examined by double immunofluorescence staining for BrdU/GFAP and BrdU/MAP2, and the percentage of BrdU-LRCs was calculated following a chase period of 24 weeks post-injection. We observed that BrdU-LRCs distributed extensively in rat brain. In the LV, DG, striatum, cerebellum and neocortex, the percentage of BrdU-LRCs was 11.3 ± 2.5%, 10.9 ± 1.3%, 6.4 ± 1.2%, 5.6 ± 0.8%, and 4.9 ± 0.6%, respectively. The highest density of BrdU-LRCs was in LV and DG, the known stem cell sites in adult mammalian brain. Both BrdU/GFAP and BrdU/MAP2 double-staining cells could be detected in the above five brain subregions. Ongoing cell production was widespread in the adult mammalian brain, which would allow us to reevaluate the capacity and potentiality of the brain in homeostasis, wound repair, and regeneration.
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Affiliation(s)
- Lei Zhang
- Psychiatric and Psychological Department, The Second Affiliated Hospital, Shantou University Medical College, North Dongxia Road, Shantou, Guangdong Province 515041, China; Mental Health Center, Shantou University Medical College, North Taishan Road, Shantou, Guangdong Province 515065, China
| | - Haihong Li
- Burn and Plastic Surgery, The Second Affiliated Hospital, Shantou University Medical College, North Dongxia Road, Shantou, Guangdong Province 515041, China.
| | - Shaopeng Zeng
- Burn and Plastic Surgery, The Second Affiliated Hospital, Shantou University Medical College, North Dongxia Road, Shantou, Guangdong Province 515041, China
| | - Lu Chen
- Burn and Plastic Surgery, The Second Affiliated Hospital, Shantou University Medical College, North Dongxia Road, Shantou, Guangdong Province 515041, China
| | - Zeman Fang
- Mental Health Center, Shantou University Medical College, North Taishan Road, Shantou, Guangdong Province 515065, China
| | - Qingjun Huang
- Mental Health Center, Shantou University Medical College, North Taishan Road, Shantou, Guangdong Province 515065, China
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Sun MY, Yetman MJ, Lee TC, Chen Y, Jankowsky JL. Specificity and efficiency of reporter expression in adult neural progenitors vary substantially among nestin-CreER(T2) lines. J Comp Neurol 2014; 522:1191-208. [PMID: 24519019 DOI: 10.1002/cne.23497] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2013] [Revised: 10/16/2013] [Accepted: 10/25/2013] [Indexed: 12/16/2022]
Abstract
Transgenic lines expressing a controllable form of Cre recombinase have become valuable tools for manipulating gene expression in adult neural progenitors and their progeny. Neural progenitors express several proteins that distinguish them from mature neurons, and the promoters for these genes have been co-opted to produce selective transgene expression within this population. To date, nine CreER(T2) transgenic lines have been designed using the nestin promoter; however, only a subset are capable of eliciting expression within both neurogenic zones of the adult brain. Here we compare three such nestin-CreER(T2) lines to evaluate specificity of expression and efficiency of recombination. Each line was examined by using three different Cre reporter strains that varied in sensitivity. We found that all three nestin-CreER(T2) strains induced reporter expression within the main neurogenic areas, albeit to varying degrees depending on the reporter. Unexpectedly, we found that two of the three lines induced substantial reporter expression outside of neurogenic areas. These lines produced strong labeling in cerebellar granule neurons, with additional expression in the cortex, hippocampus, striatum, and thalamus. Reporter expression in the third nestin-CreER(T2) line was considerably more specific, but was also less efficient, labeling a smaller percentage of the target population than the other two drivers. Our findings suggest that each nestin-CreER(T2) line may best serve different experimental needs, depending on whether specificity or efficiency is of greatest concern. Our study further demonstrates that each new pair of driver and responder lines should be evaluated independently, as both components can significantly influence the resulting expression pattern.
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Affiliation(s)
- Min-Yu Sun
- Department of Neuroscience, Baylor College of Medicine, Houston, Texas, 77030
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N-Methyl-N-nitrosourea during late gestation results in concomitant but reversible progenitor cell reduction and delayed neurogenesis in the hippocampus of rats. Toxicol Lett 2014; 226:285-93. [DOI: 10.1016/j.toxlet.2014.02.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2014] [Revised: 02/21/2014] [Accepted: 02/21/2014] [Indexed: 01/30/2023]
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Immature doublecortin-positive hippocampal neurons are important for learning but not for remembering. J Neurosci 2013; 33:6603-13. [PMID: 23575857 DOI: 10.1523/jneurosci.3064-12.2013] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
It is now widely accepted that hippocampal neurogenesis underpins critical cognitive functions, such as learning and memory. To assess the behavioral importance of adult-born neurons, we developed a novel knock-in mouse model that allowed us to specifically and reversibly ablate hippocampal neurons at an immature stage. In these mice, the diphtheria toxin receptor (DTR) is expressed under control of the doublecortin (DCX) promoter, which allows for specific ablation of immature DCX-expressing neurons after administration of diphtheria toxin while leaving the neural precursor pool intact. Using a spatially challenging behavioral test (a modified version of the active place avoidance test), we present direct evidence that immature DCX-expressing neurons are required for successful acquisition of spatial learning, as well as reversal learning, but are not necessary for the retrieval of stored long-term memories. Importantly, the observed learning deficits were rescued as newly generated immature neurons repopulated the granule cell layer upon termination of the toxin treatment. Repeat (or cyclic) depletion of immature neurons reinstated behavioral deficits if the mice were challenged with a novel task. Together, these findings highlight the potential of stimulating neurogenesis as a means to enhance learning.
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Functional implications of hippocampal adult neurogenesis in intellectual disabilities. Amino Acids 2013; 45:113-31. [DOI: 10.1007/s00726-013-1489-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Accepted: 03/15/2013] [Indexed: 12/19/2022]
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Shyam K Sharan KB, Sharan SK. Manipulating the Mouse Genome Using Recombineering. ADVANCES IN GENETICS 2013; 2. [PMID: 31404315 DOI: 10.4172/2169-0111.1000108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Genetically engineered mouse models are indispensable for understanding the biological function of genes, understanding the genetic basis of human diseases and for preclinical testing of novel therapies. Generation of such mouse models has been possible because of our ability to manipulate the mouse genome. Recombineering is a highly efficient recombination-based method of genetic engineering that has revolutionized our ability to generate mouse models. Since recombineering technology is not dependent on the availability of restriction enzyme recognition sites, it allows us to modify the genome with great precision. It requires homology arms as short as 40 bases for recombination, which makes it relatively easy to generate targeting constructs to insert, change or delete either a single nucleotide or a DNA fragment several kb in size; insert selectable markers, reporter genes or add epitope tags to any gene of interest. In this review, we focus on the development of recombineering technology and its application in the generation of transgenic and knockout or knock-in mouse models. High throughput generation of gene targeting vectors, used to construct knockout alleles in mouse embryonic stem cells, is now feasible because of this technology. The challenge now is to use the "designer" mice to develop novel therapies to prevent, cure or effectively manage some the most debilitating human diseases.
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Affiliation(s)
| | - Shyam K Sharan
- Mouse Cancer Genetics Program, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, Maryland 21702
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Xi Y, Zhu C, Xu Q. Neuroscience in China 2010–2011. CHINESE SCIENCE BULLETIN-CHINESE 2012. [DOI: 10.1007/s11434-012-5551-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Veena J, Rao BSS, Srikumar BN. Regulation of adult neurogenesis in the hippocampus by stress, acetylcholine and dopamine. J Nat Sci Biol Med 2012; 2:26-37. [PMID: 22470231 PMCID: PMC3312696 DOI: 10.4103/0976-9668.82312] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Neurogenesis is well-established to occur during adulthood in two regions of the brain, the subventricular zone (SVZ) and the subgranular zone (SGZ) of the dentate gyrus in the hippocampus. Research for more than two decades has implicated a role for adult neurogenesis in several brain functions including learning and effects of antidepressants and antipsychotics. Clear understanding of the players involved in the regulation of adult neurogenesis is emerging. We review evidence for the role of stress, dopamine (DA) and acetylcholine (ACh) as regulators of neurogenesis in the SGZ. Largely, stress decreases neurogenesis, while the effects of ACh and DA depend on the type of receptors mediating their action. Increasingly, the new neurons formed in adulthood are potentially linked to crucial brain processes such as learning and memory. In brain disorders like Alzheimer and Parkinson disease, stress-induced cognitive dysfunction, depression and age-associated dementia, the necessity to restore brain functions is enormous. Activation of the resident stem cells in the adult brain to treat neuropsychiatric disorders has immense potential and understanding the mechanisms of regulation of adult neurogenesis by endogenous and exogenous factors holds the key to develop therapeutic strategies for the debilitating neurological and psychiatric disorders.
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Affiliation(s)
- J Veena
- Laboratoire Psynugen, Université Bordeaux 2, Bordeaux, France
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Werner L, Müller-Fielitz H, Ritzal M, Werner T, Rossner M, Schwaninger M. Involvement of doublecortin-expressing cells in the arcuate nucleus in body weight regulation. Endocrinology 2012; 153:2655-64. [PMID: 22492306 DOI: 10.1210/en.2011-1760] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Hypothalamic functions, including feeding behavior, show a high degree of plasticity throughout life. Doublecortin (DCX) is a marker of plasticity and neuronal migration expressed in the hypothalamus. Therefore, we wanted to map the fate of DCX(+) cells in the arcuate nucleus (ARC) of the hypothalamus. For this purpose, we generated a BAC transgenic mouse line that expresses the inducible recombinase CreER(T2) under control of the DCX locus. Crossing this line with the Rosa26 or Ai14 reporter mouse lines, we found reporter(+) cells in the ARC upon tamoxifen treatment. They were born prenatally and expressed both DCX and the plasticity marker TUC-4. Immediately after labeling, reporter(+) cells had an enlarged soma that normalized over time, suggesting morphological remodeling. Reporter(+) cells expressed β-endorphin and BSX, neuronal markers of the feeding circuit. Furthermore, leptin treatment led to phosphorylation of STAT3 in reporter(+) cells in accordance with the concept that they are part of the feeding circuits. Indeed, we found a negative correlation between the number of reporter(+) cells and body weight and epididymal fat pads. Our data suggest that DCX(+) cells in the ARC represent a cellular correlate of plasticity that is involved in controlling energy balance in adult mice.
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Affiliation(s)
- Lars Werner
- Institute of Experimental and Clinical Pharmacology and Toxicology, University of Lübeck, 23538 Lübeck, Germany
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Masiulis I, Yun S, Eisch AJ. The interesting interplay between interneurons and adult hippocampal neurogenesis. Mol Neurobiol 2011; 44:287-302. [PMID: 21956642 DOI: 10.1007/s12035-011-8207-z] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2011] [Accepted: 09/07/2011] [Indexed: 10/17/2022]
Abstract
Adult neurogenesis is a unique form of plasticity found in the hippocampus, a brain region key to learning and memory formation. While many external stimuli are known to modulate the generation of new neurons in the hippocampus, little is known about the local circuitry mechanisms that regulate the process of adult neurogenesis. The neurogenic niche in the hippocampus is highly complex and consists of a heterogeneous population of cells including interneurons. Because interneurons are already highly integrated into the hippocampal circuitry, they are in a prime position to influence the proliferation, survival, and maturation of adult-generated cells in the dentate gyrus. Here, we review the current state of our understanding on the interplay between interneurons and adult hippocampal neurogenesis. We focus on activity- and signaling-dependent mechanisms, as well as research on human diseases that could provide better insight into how interneurons in general might add to our comprehension of the regulation and function of adult hippocampal neurogenesis.
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Affiliation(s)
- Irene Masiulis
- UT Southwestern Medical Center, Dallas, TX 75390-9070, USA.
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Imayoshi I, Sakamoto M, Kageyama R. Genetic methods to identify and manipulate newly born neurons in the adult brain. Front Neurosci 2011; 5:64. [PMID: 21562606 PMCID: PMC3087966 DOI: 10.3389/fnins.2011.00064] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2011] [Accepted: 04/19/2011] [Indexed: 12/12/2022] Open
Abstract
Although mammalian neurogenesis is mostly completed by the perinatal period, new neurons are continuously generated in the subventricular zone of the lateral ventricle and the subgranular zone of the hippocampal dentate gyrus. Since the discovery of adult neurogenesis, many extensive studies have been performed on various aspects of adult neurogenesis, including proliferation and fate-specification of adult neural stem cells, and the migration, maturation and synaptic integration of newly born neurons. Furthermore, recent research has shed light on the intensive contribution of adult neurogenesis to olfactory-related and hippocampus-mediated brain functions. The field of adult neurogenesis progressed tremendously thanks to technical advances that facilitate the identification and selective manipulation of newly born neurons among billions of pre-existing neurons in the adult central nervous system. In this review, we introduce recent advances in the methodologies for visualizing newly generated neurons and manipulating neurogenesis in the adult brain. Particularly, the application of site-specific recombinases and Tet inducible system in combination with transgenic or gene targeting strategy is discussed in further detail.
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Affiliation(s)
- Itaru Imayoshi
- Institute for Virus Research, Kyoto University Kyoto, Japan
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Zhang J, Giesert F, Kloos K, Vogt Weisenhorn DM, Aigner L, Wurst W, Couillard-Despres S. A powerful transgenic tool for fate mapping and functional analysis of newly generated neurons. BMC Neurosci 2010; 11:158. [PMID: 21194452 PMCID: PMC3019205 DOI: 10.1186/1471-2202-11-158] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2010] [Accepted: 12/31/2010] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Lack of appropriate tools and techniques to study fate and functional integration of newly generated neurons has so far hindered understanding of neurogenesis' relevance under physiological and pathological conditions. Current analyses are either dependent on mitotic labeling, for example BrdU-incorporation or retroviral infection, or on the detection of transient immature neuronal markers. Here, we report a transgenic mouse model (DCX-CreERT2) for time-resolved fate analysis of newly generated neurons. This model is based on the expression of a tamoxifen-inducible Cre recombinase under the control of a doublecortin (DCX) promoter, which is specific for immature neuronal cells in the CNS. RESULTS In the DCX-CreERT2 transgenic mice, expression of CreERT2 was restricted to DCX+ cells. In the CNS of transgenic embryos and adult DCX-CreERT2 mice, tamoxifen administration caused the transient translocation of CreERT2 to the nucleus, allowing for the recombination of loxP-flanked sequences. In our system, tamoxifen administration at E14.5 resulted in reporter gene activation throughout the developing CNS of transgenic embryos. In the adult CNS, neurogenic regions were the primary sites of tamoxifen-induced reporter gene activation. In addition, reporter expression could also be detected outside of neurogenic regions in cells physiologically expressing DCX (e.g. piriform cortex, corpus callosum, hypothalamus). Four weeks after recombination, the vast majority of reporter-expressing cells were found to co-express NeuN, revealing the neuronal fate of DCX+ cells upon maturation. CONCLUSIONS This first validation demonstrates that our new DCX-CreERT2 transgenic mouse model constitutes a powerful tool to investigate neurogenesis, migration and their long-term fate of neuronal precursors. Moreover, it allows for a targeted activation or deletion of specific genes in neuronal precursors and will thereby contribute to unravel the molecular mechanisms controlling neurogenesis.
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Affiliation(s)
- Jingzhong Zhang
- Institute of Developmental Genetics, Helmholtz Zentrum Muenchen, German Research Center for Environmental Health (GmbH), Ingolstaedter Landstrasse 1, D-85764 Neuherberg, Germany
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