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Neuroscience

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Preventing neuronal edema increases network excitability after traumatic brain injury
Punam A. Sawant-Pokam, … , Nick O. McKean, K.C. Brennan
Punam A. Sawant-Pokam, … , Nick O. McKean, K.C. Brennan
Published October 12, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI134793.
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Preventing neuronal edema increases network excitability after traumatic brain injury

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Abstract

Edema is an important target for clinical intervention after traumatic brain injury (TBI). We used in vivo cellular resolution imaging and electrophysiological recording to examine the ionic mechanisms underlying neuronal edema and their effects on neuronal and network excitability after controlled cortical impact (CCI) in mice. Unexpectedly, we found that neuronal edema 48 hours after CCI was associated with reduced cellular and network excitability, concurrent with an increase in the expression ratio of the cation-chloride cotransporters (CCCs) NKCC1 and KCC2. Treatment with the CCC blocker bumetanide prevented neuronal swelling via a reversal in the NKCC1/KCC2 expression ratio, identifying altered chloride flux as the mechanism of neuronal edema. Importantly, bumetanide treatment was associated with increased neuronal and network excitability after injury, including increased susceptibility to spreading depolarizations (SDs) and seizures, known agents of clinical worsening after TBI. Treatment with mannitol, a first-line edema treatment in clinical practice, was also associated with increased susceptibility to SDs and seizures after CCI, showing that neuronal volume reduction, regardless of mechanism, was associated with an excitability increase. Finally, we observed an increase in excitability when neuronal edema normalized by 1 week after CCI. We conclude that neuronal swelling may exert protective effects against damaging excitability in the aftermath of TBI and that treatment of edema has the potential to reverse these effects.

Authors

Punam A. Sawant-Pokam, Tyler J. Vail, Cameron S. Metcalf, Jamie L. Maguire, Thomas O. McKean, Nick O. McKean, K.C. Brennan

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Haploinsufficiency of immune checkpoint receptor CTLA4 induces a distinct neuroinflammatory disorder
Matthew K. Schindler, … , Daniel S. Reich, Gulbu Uzel
Matthew K. Schindler, … , Daniel S. Reich, Gulbu Uzel
Published September 21, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI135947.
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Haploinsufficiency of immune checkpoint receptor CTLA4 induces a distinct neuroinflammatory disorder

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Abstract

BACKGROUND Cytotoxic T lymphocyte antigen 4 (CTLA4) is essential for immune homeostasis. Genetic mutations causing haploinsufficiency (CTLA4h) lead to a phenotypically heterogenous, immune-mediated disease that can include neuroinflammation. The neurological manifestations of CTLA4h are poorly characterized.METHODS We performed an observational natural history study of 50 patients with CTLA4h who were followed at the NIH. We analyzed clinical, radiological, immunological, and histopathological data.RESULTS Evidence for neuroinflammation was observed in 32% (n = 16 of 50) of patients in this cohort by magnetic resonance imaging (MRI) and/or by cerebrospinal fluid analysis. Clinical symptoms were commonly absent or mild in severity, with headaches as the leading complaint (n = 13 of 16). The most striking findings were relapsing, large, contrast-enhancing focal lesions in the brain and spinal cord observed on MRI. We detected inflammation in the cerebrospinal fluid and leptomeninges before the parenchyma. Brain biopsies of inflammatory lesions from 10 patients showed perivascular and intraparenchymal mixed cellular infiltrates with little accompanying demyelination or neuronal injury.CONCLUSIONS Neuroinflammation due to CTLA4h is mediated primarily by an infiltrative process with a distinct and striking dissociation between clinical symptoms and radiological findings in the majority of patients.FUNDING NIAID, NIH, Division of Intramural Research, NINDS, NIH, Division of Intramural Research, and the National Multiple Sclerosis Society–American Brain Foundation.TRIAL REGISTRATION ClinicalTrials.gov NCT00001355.

Authors

Matthew K. Schindler, Stefania Pittaluga, Yoshimi Enose-Akahata, Helen C. Su, V. Koneti Rao, Amy Rump, Steven Jacobson, Irene Cortese, Daniel S. Reich, Gulbu Uzel

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Cyclophilin D–dependent oligodendrocyte mitochondrial ion leak contributes to neonatal white matter injury
Zoya Niatsetskaya, … , Evgeny Pavlov, Vadim Ten
Zoya Niatsetskaya, … , Evgeny Pavlov, Vadim Ten
Published September 14, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI133082.
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Cyclophilin D–dependent oligodendrocyte mitochondrial ion leak contributes to neonatal white matter injury

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Abstract

Postnatal failure of oligodendrocyte maturation has been proposed as a cellular mechanism of diffuse white matter injury (WMI) in premature infants. However, the molecular mechanisms for oligodendrocyte maturational failure remain unclear. In neonatal mice and cultured differentiating oligodendrocytes, sublethal intermittent hypoxic (IH) stress activated cyclophilin D–dependent mitochondrial proton leak and uncoupled mitochondrial respiration, leading to transient bioenergetic stress. This was associated with development of diffuse WMI: poor oligodendrocyte maturation, diffuse axonal hypomyelination, and permanent sensorimotor deficit. In normoxic mice and oligodendrocytes, exposure to a mitochondrial uncoupler recapitulated the phenotype of WMI, supporting the detrimental role of mitochondrial uncoupling in the pathogenesis of WMI. Compared with WT mice, cyclophilin D–knockout littermates did not develop bioenergetic stress in response to IH challenge and fully preserved oligodendrocyte maturation, axonal myelination, and neurofunction. Our study identified the cyclophilin D–dependent mitochondrial proton leak and uncoupling as a potentially novel subcellular mechanism for the maturational failure of oligodendrocytes and offers a potential therapeutic target for prevention of diffuse WMI in premature infants experiencing chronic IH stress.

Authors

Zoya Niatsetskaya, Sergey Sosunov, Anna Stepanova, James Goldman, Alexander Galkin, Maria Neginskaya, Evgeny Pavlov, Vadim Ten

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A GABAergic neural circuit in the ventromedial hypothalamus mediates chronic stress-induced bone loss
Fan Yang, … , Yinghui Li, Liping Wang
Fan Yang, … , Yinghui Li, Liping Wang
Published September 10, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI136105.
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A GABAergic neural circuit in the ventromedial hypothalamus mediates chronic stress-induced bone loss

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Abstract

Homeostasis of bone metabolism is regulated by the central nervous system and mood disorders such as anxiety are associated with bone metabolism abnormalities, yet our understanding of the central neural circuits regulating bone metabolism is limited. Here, we demonstrate that chronic stress in crewmembers resulted in decreased bone density and elevated anxiety in an isolated habitat mimicking a space station. We then used a mouse model to demonstrate that GABAergic neural circuitry in the ventromedial hypothalamus (VMH) mediates chronic stress-induced bone loss. We show that GABAergic inputs in the VMHdm arise from a specific group of somatostatin neurons in the posterior region of bed nucleus of the stria terminalis (BNST), which is indispensable for stress-induced bone loss and is able to trigger bone loss in the absence of stressors. In addition, the sympathetic system and glutamatergic neurons in nucleus tractus solitaries (NTS) were employed to regulate stress-induced bone loss. Our study has therefore identified the central neural mechanism by which chronic stress induced mood disorders, such as anxiety, influence bone metabolism.

Authors

Fan Yang, Yunhui Liu, Shanping Chen, Zhongquan Dai, Dazhi Yang, Dashuang Gao, Jie Shao, Yuyao Wang, Ting Wang, Zhijian Zhang, Lu Zhang, William W. Lu, Yinghui Li, Liping Wang

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Astrocytic neogenin/netrin-1 pathway promotes blood vessel homeostasis and function in mouse cortex
Ling-ling Yao, … , Lin Mei, Wen-Cheng Xiong
Ling-ling Yao, … , Lin Mei, Wen-Cheng Xiong
Published August 27, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI132372.
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Astrocytic neogenin/netrin-1 pathway promotes blood vessel homeostasis and function in mouse cortex

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Abstract

Astrocytes play multiple functions in the brain, including blood vessel (BV) homeostasis and function. However, the underlying mechanisms remain elusive. Here, we provide evidence for astrocytic neogenin (NEO1), a member of deleted in colorectal cancer (DCC) family netrin receptors, to be involved in this event. Mice with Neo1 depletion in astrocytes exhibited clustered astrocyte distribution and increased BVs in their cortex. These BVs were leaky with reduced blood flow, disrupted basement membranes (vBMs), decreased pericytes, impaired endothelial cell (EC) barrier, and elevated tip EC proliferation. Increased proliferation was also detected in cultured ECs exposed to the conditional medium (CM) of NEO1 depleted astrocytes. Further screening for angiogenetic factors in the CM identifies netrin-1 (NTN1), whose expression was decreased in NEO1 depleted cortical astrocytes. Adding NTN1 into the CM of NEO1 depleted astrocytes attenuated EC proliferation. Expressing NTN1 in NEO1 mutant cortical astrocytes ameliorated phenotypes in blood–brain barrier (BBB), EC, and astrocyte distribution. NTN1 depletion in astrocytes resulted in similar BV/BBB deficits in the cortex as those of Neo1 mutant mice. In aggregates, these results uncovered an unrecognized pathway, astrocytic NEO1 to NTN1, not only regulating astrocyte distribution, but also promoting cortical BV homeostasis and function.

Authors

Ling-ling Yao, Jin-xia Hu, Qiang Li, Daehoon Lee, Xiao Ren, Jun-shi Zhang, Dong Sun, Hong-sheng Zhang, Yong-gang Wang, Lin Mei, Wen-Cheng Xiong

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dmPFC-vlPAG projection neurons contribute to pain maintenance thresholds and anxiolytic behaviors
Jun-Bin Yin, … , Yu-Lin Dong, Yun-Qing Li
Jun-Bin Yin, … , Yu-Lin Dong, Yun-Qing Li
Published August 25, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI127607.
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dmPFC-vlPAG projection neurons contribute to pain maintenance thresholds and anxiolytic behaviors

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Abstract

The dorsal medial prefrontal cortex (dmPFC) has been recognized as a key cortical area for nociceptive modulation. However, the underlying neural pathway and the function of specific cell types remain largely unclear. Here, we showed that lesions of the dmPFC induced an algesic and anxious state. By using multiple tracing methods including rabies-based transsynaptic tracing method, an excitatory descending neural pathway from the dmPFC to the ventrolateral periaqueductal gray (vlPAG) was outlined. Specific activation of the dmPFC-vlPAG neural pathway by an optogenetic manipulation, produced analgesic and anxiolytic effects in a chronic pain mice model. Inhibitory neurons in the dmPFC were specifically activated by using a chemogenetic approach, which logically produced an algesic and anxious state under both normal and chronic pain conditions. Antagonists of GABAAR or mGluR1 were applied to the dmPFC, which produced analgesic and anxiolytic effects. In summary, the present results suggest that the dmPFC-vlPAG neural pathway might participate in the maintenance of pain thresholds and anxiolytic behaviors under normal conditions, while silencing or suppressing the dmPFC-vlPAG pathway might be involved in the initial stages and maintenance of chronic pain and the emergence of anxiety-like behaviors.

Authors

Jun-Bin Yin, Shao-Hua Liang, Fei Li, Wen-Jun Zhao, Yang Bai, Yi Sun, Zhen-Yu Wu, Tan Ding, Yan Sun, Hai-Xia Liu, Ya-Cheng Lu, Ting Zhang, Jing Huang, Tao Chen, Hui Li, Zhou-Feng Chen, Jing Cao, Rui Ren, Ya-Nan Peng, Juan Yang, Wei-Dong Zang, Xiang Li, Yu-Lin Dong, Yun-Qing Li

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Mapping mania symptoms based on focal brain damage
Gonçalo Cotovio, … , Albino J. Oliveira-Maia, Michael D. Fox
Gonçalo Cotovio, … , Albino J. Oliveira-Maia, Michael D. Fox
Published August 24, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI136096.
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Mapping mania symptoms based on focal brain damage

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BACKGROUND Although mania is characteristic of bipolar disorder, it can also occur following focal brain damage. Such cases may provide unique insight into brain regions responsible for mania symptoms and identify therapeutic targets.METHODS Lesion locations associated with mania were identified using a systematic literature search (n = 41) and mapped onto a common brain atlas. The network of brain regions functionally connected to each lesion location was computed using normative human connectome data (resting-state functional MRI, n = 1000) and contrasted with those obtained from lesion locations not associated with mania (n = 79). Reproducibility was assessed using independent cohorts of mania lesions derived from clinical chart review (n = 15) and of control lesions (n = 490). Results were compared with brain stimulation sites previously reported to induce or relieve mania symptoms.RESULTS Lesion locations associated with mania were heterogeneous and no single brain region was lesioned in all, or even most, cases. However, these lesion locations showed a unique pattern of functional connectivity to the right orbitofrontal cortex, right inferior temporal gyrus, and right frontal pole. This connectivity profile was reproducible across independent lesion cohorts and aligned with the effects of therapeutic brain stimulation on mania symptoms.CONCLUSIONS Brain lesions associated with mania are characterized by a specific pattern of brain connectivity that lends insight into localization of mania symptoms and potential therapeutic targets.FUNDING Fundação para a Ciência e Tecnologia (FCT), Harvard Medical School DuPont-Warren Fellowship, Portuguese national funds from FCT and Fundo Europeu de Desenvolvimento Regional, Child Neurology Foundation Shields Research, Sidney R. Baer, Jr. Foundation, Nancy Lurie Marks Foundation, Mather’s Foundation, and the NIH.

Authors

Gonçalo Cotovio, Daniel Talmasov, J. Bernardo Barahona-Corrêa, Joey Hsu, Suhan Senova, Ricardo Ribeiro, Louis Soussand, Ana Velosa, Vera Cruz e Silva, Natalia Rost, Ona Wu, Alexander L. Cohen, Albino J. Oliveira-Maia, Michael D. Fox

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Truncated stathmin-2 is a marker of TDP-43 pathology in frontotemporal dementia
Mercedes Prudencio, … , Pietro Fratta, Leonard Petrucelli
Mercedes Prudencio, … , Pietro Fratta, Leonard Petrucelli
Published August 13, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI139741.
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Truncated stathmin-2 is a marker of TDP-43 pathology in frontotemporal dementia

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Abstract

No treatment for frontotemporal dementia (FTD), the second most common early-onset dementia, is available but therapeutics are being investigated to target the two main proteins associated with FTD pathological subtypes: TDP-43 (FTLD-TDP) and tau (FTLD-tau). Testing potential therapies in clinical trials is hamstrung by our inability to distinguish between patients with FTLD-TDP and FTLD-tau. Therefore, we evaluated truncated stathmin-2 (STMN2) as a proxy of TDP-43 pathology, given reports that TDP-43 dysfunction causes truncated STMN2 accumulation. Truncated STMN2 accumulated in human iPSC-derived neurons depleted of TDP-43, but not in those with pathogenic TARDBP mutations in the absence of TDP-43 aggregation or loss of nuclear protein. In RNA-seq analyses of human brain samples from the NYGC ALS cohort, truncated STMN2 RNA was confined to tissues and disease sub-types marked by TDP-43 inclusions. Lastly, we validated that truncated STMN2 RNA is elevated in the frontal cortex of a cohort of FTLD-TDP cases but not in controls or cases with progressive supranuclear palsy (PSP), a type of FTLD-tau. Further, in FTLD-TDP, we observed significant associations of truncated STMN2 RNA with phosphorylated TDP-43 levels and an earlier age of disease onset. Overall, our data uncovered truncated STMN2 as a marker for TDP-43 dysfunction in FTD.

Authors

Mercedes Prudencio, Jack Humphrey, Sarah Pickles, Anna-Leigh Brown, Sarah E. Hill, Jennifer Kachergus, Ji Shi, Michael Heckman, Matthew Spiegel, Casey Cook, Yuping Song, Mei Yue, Lillian Daughrity, Yari Carlomagno, Karen Jansen-West, Cristhoper Fernandez De Castro, Michael DeTure, Shunsuke Koga, Ying-Chih Wang, Prasanth Sivakumar, Cristian Bodo, Ana Candalija, Kevin Talbot, Bhuvaneish T. Selvaraj, Karen Burr, Siddharthan Chandran, Jia Newcombe, Tammaryn Lashley, Isabel Hubbard, Demetra Catalano, Duyang Kim, Nadia Propp, Samantha Fennessey, Delphine Fagegaltier, Hemali Phatnani, Maria Secrier, Elizabeth M.C. Fisher, Björn Oskarsson, Marka van Blitterswijk, Rosa Rademakers, Neill R. Graff-Radford, Bradley Boeve, David S. Knopman, Ronald Petersen, Keith Josephs, E. Aubrey Thompson, Towfique Raj, Michael E. Ward, Dennis Dickson, Tania F. Gendron, Pietro Fratta, Leonard Petrucelli

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Krabbe disease successfully treated via monotherapy of intrathecal gene therapy
Allison M. Bradbury, … , Steven J. Gray, Charles H. Vite
Allison M. Bradbury, … , Steven J. Gray, Charles H. Vite
Published August 10, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI133953.
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Krabbe disease successfully treated via monotherapy of intrathecal gene therapy

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Abstract

Globoid cell leukodystrophy (GLD; Krabbe disease) is a progressive, incurable neurodegenerative disease caused by deficient activity of the hydrolytic enzyme galactosylceramidase (GALC). The ensuing cytotoxic accumulation of psychosine results in diffuse central and peripheral nervous system (CNS, PNS) demyelination. Presymptomatic hematopoietic stem cell transplantation (HSCT) is the only treatment for infantile-onset GLD; however, clinical outcomes of HSCT recipients often remain poor, and procedure-related morbidity is high. There are no effective therapies for symptomatic patients. Herein, we demonstrate in the naturally occurring canine model of GLD that presymptomatic monotherapy with intrathecal AAV9 encoding canine GALC administered into the cisterna magna increased GALC enzyme activity, normalized psychosine concentration, improved myelination, and attenuated inflammation in both the CNS and PNS. Moreover, AAV-mediated therapy successfully prevented clinical neurological dysfunction, allowing treated dogs to live beyond 2.5 years of age, more than 7 times longer than untreated dogs. Furthermore, we found that a 5-fold lower dose resulted in an attenuated form of disease, indicating that sufficient dosing is critical. Finally, postsymptomatic therapy with high-dose AAV9 also significantly extended lifespan, signifying a treatment option for patients for whom HSCT is not applicable. If translatable to patients, these findings would improve the outcomes of patients treated either pre- or postsymptomatically.

Authors

Allison M. Bradbury, Jessica H. Bagel, Duc Nguyen, Erik A. Lykken, Jill Pesayco Salvador, Xuntian Jiang, Gary P. Swain, Charles A. Assenmacher, Ian J. Hendricks, Keiko Miyadera, Rebecka S. Hess, Arielle Ostrager, Patricia ODonnell, Mark S. Sands, Daniel S. Ory, G. Diane Shelton, Ernesto R. Bongarzone, Steven J. Gray, Charles H. Vite

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Dysfunction of parvalbumin neurons in the cerebellar nuclei produces an action tremor
Mu Zhou, … , Wei Xu, Thomas C. Sudhof
Mu Zhou, … , Wei Xu, Thomas C. Sudhof
Published July 7, 2020
Citation Information: J Clin Invest. 2020. https://doi.org/10.1172/JCI135802.
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Dysfunction of parvalbumin neurons in the cerebellar nuclei produces an action tremor

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Abstract

Essential tremor is a common brain disorder affecting millions of people, yet the neuronal mechanisms underlying this prevalent disease remain elusive. Here, we show that conditional deletion of synaptotagmin-2, the fastest Ca2+-sensor for synaptic neurotransmitter release, from parvalbumin neurons in mice causes an action tremor syndrome resembling the core symptom of essential tremor patients. Combining brain region-specific and cell type-specific genetic manipulation methods, we found that deletion of synaptotagmin-2 from excitatory parvalbumin-positive neurons in cerebellar nuclei was sufficient to generate an action tremor. The synaptotagmin-2 deletion converted synchronous into asynchronous neurotransmitter release in projections from cerebellar nuclei neurons onto gigantocellular reticular nucleus neurons, which might produce an action tremor by causing signal oscillations during movement. The tremor was rescued by completely blocking synaptic transmission with tetanus toxin in cerebellar nuclei, which also reversed the tremor phenotype in the traditional harmaline-induced essential tremor model. Using a promising animal model for action tremor, our results thus characterize a synaptic circuit mechanism that may underlie the prevalent essential tremor disorder.

Authors

Mu Zhou, Maxwell D. Melin, Wei Xu, Thomas C. Sudhof

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