Go to JCI Insight
  • About
  • Editors
  • Consulting Editors
  • For authors
  • Alerts
  • Advertising/recruitment
  • Subscribe
  • Contact
  • Current Issue
  • Past Issues
  • By specialty
    • COVID-19
    • Cardiology
    • Gastroenterology
    • Immunology
    • Metabolism
    • Nephrology
    • Neuroscience
    • Oncology
    • Pulmonology
    • Vascular biology
    • All ...
  • Videos
    • Conversations with Giants in Medicine
    • Author's Takes
  • Reviews
    • View all reviews ...
    • 100th Anniversary of Insulin's Discovery (Jan 2021)
    • Hypoxia-inducible factors in disease pathophysiology and therapeutics (Oct 2020)
    • Latency in Infectious Disease (Jul 2020)
    • Immunotherapy in Hematological Cancers (Apr 2020)
    • Big Data's Future in Medicine (Feb 2020)
    • Mechanisms Underlying the Metabolic Syndrome (Oct 2019)
    • Reparative Immunology (Jul 2019)
    • View all review series ...
  • Viewpoint
  • Collections
    • Recently published
    • In-Press Preview
    • Commentaries
    • Concise Communication
    • Editorials
    • Viewpoint
    • Top read articles
  • Clinical Medicine
  • JCI This Month
    • Current issue
    • Past issues

  • Current issue
  • Past issues
  • Specialties
  • Reviews
  • Review series
  • Conversations with Giants in Medicine
  • Author's Takes
  • Recently published
  • In-Press Preview
  • Commentaries
  • Concise Communication
  • Editorials
  • Viewpoint
  • Top read articles
  • About
  • Editors
  • Consulting Editors
  • For authors
  • Alerts
  • Advertising/recruitment
  • Subscribe
  • Contact

Neuroscience

  • 443 Articles
  • 7 Posts
  • ← Previous
  • 1
  • 2
  • …
  • 37
  • 38
  • 39
  • …
  • 44
  • 45
  • Next →
Mechanism of age-dependent susceptibility and novel treatment strategy in glutaric acidemia type I
William J. Zinnanti, … , Russell E. Jacobs, Keith C. Cheng
William J. Zinnanti, … , Russell E. Jacobs, Keith C. Cheng
Published October 11, 2007
Citation Information: J Clin Invest. 2007. https://doi.org/10.1172/JCI31617.
View: Text | PDF

Mechanism of age-dependent susceptibility and novel treatment strategy in glutaric acidemia type I

  • Text
  • PDF
Abstract

Glutaric acidemia type I (GA-I) is an inherited disorder of lysine and tryptophan metabolism presenting with striatal lesions anatomically and symptomatically similar to Huntington disease. Affected children commonly suffer acute brain injury in the context of a catabolic state associated with nonspecific illness. The mechanisms underlying injury and age-dependent susceptibility have been unknown, and lack of a diagnostic marker heralding brain injury has impeded intervention efforts. Using a mouse model of GA-I, we show that pathologic events began in the neuronal compartment while enhanced lysine accumulation in the immature brain allowed increased glutaric acid production resulting in age-dependent injury. Glutamate and GABA depletion correlated with brain glutaric acid accumulation and could be monitored in vivo by proton nuclear magnetic resonance (1H NMR) spectroscopy as a diagnostic marker. Blocking brain lysine uptake reduced glutaric acid levels and brain injury. These findings provide what we believe are new monitoring and treatment strategies that may translate for use in human GA-I.

Authors

William J. Zinnanti, Jelena Lazovic, Cathy Housman, Kathryn LaNoue, James P. O’Callaghan, Ian Simpson, Michael Woontner, Stephen I. Goodman, James R. Connor, Russell E. Jacobs, Keith C. Cheng

×

Calpain activation impairs neuromuscular transmission in a mouse model of the slow-channel myasthenic syndrome
Jason S. Groshong, … , Richard J. Miller, Christopher M. Gomez
Jason S. Groshong, … , Richard J. Miller, Christopher M. Gomez
Published October 1, 2007
Citation Information: J Clin Invest. 2007;117(10):2903-2912. https://doi.org/10.1172/JCI30383.
View: Text | PDF

Calpain activation impairs neuromuscular transmission in a mouse model of the slow-channel myasthenic syndrome

  • Text
  • PDF
Abstract

The slow-channel myasthenic syndrome (SCS) is a hereditary disorder of the acetylcholine receptor (AChR) of the neuromuscular junction (NMJ) that leads to prolonged AChR channel opening, Ca2+ overload, and degeneration of the NMJ. We used an SCS transgenic mouse model to investigate the role of the calcium-activated protease calpain in the pathogenesis of synaptic dysfunction in SCS. Cleavage of a fluorogenic calpain substrate was increased at the NMJ of dissociated muscle fibers. Inhibition of calpain using a calpastatin (CS) transgene improved strength and neuromuscular transmission. CS caused a 2-fold increase in the frequency of miniature endplate currents (MEPCs) and an increase in NMJ size, but MEPC amplitudes remained reduced. Persistent degeneration of the NMJ was associated with localized activation of the non-calpain protease caspase-3. This study suggests that calpain may act presynaptically to impair NMJ function in SCS but further reveals a role for other cysteine proteases whose inhibition may be of additional therapeutic benefit in SCS and other excitotoxic disorders.

Authors

Jason S. Groshong, Melissa J. Spencer, Bula J. Bhattacharyya, Elena Kudryashova, Bhupinder P.S. Vohra, Roberto Zayas, Robert L. Wollmann, Richard J. Miller, Christopher M. Gomez

×

Sensitization of TRPA1 by PAR2 contributes to the sensation of inflammatory pain
Yi Dai, … , Hiroki Yamanaka, Koichi Noguchi
Yi Dai, … , Hiroki Yamanaka, Koichi Noguchi
Published October 1, 2007
Citation Information: J Clin Invest. 2007;117(10):3140-3140. https://doi.org/10.1172/JCI30951C1.
View: Text | PDF | Amended Article

Sensitization of TRPA1 by PAR2 contributes to the sensation of inflammatory pain

  • Text
  • PDF
Abstract

Authors

Yi Dai, Shenglan Wang, Makoto Tominaga, Satoshi Yamamoto, Tetsuo Fukuoka, Tomohiro Higashi, Kimiko Kobayashi, Koichi Obata, Hiroki Yamanaka, Koichi Noguchi

×

Induction of neostriatal neurogenesis slows disease progression in a transgenic murine model of Huntington disease
Sung-Rae Cho, … , Aris Economides, Steven A. Goldman
Sung-Rae Cho, … , Aris Economides, Steven A. Goldman
Published October 1, 2007
Citation Information: J Clin Invest. 2007;117(10):2889-2902. https://doi.org/10.1172/JCI31778.
View: Text | PDF

Induction of neostriatal neurogenesis slows disease progression in a transgenic murine model of Huntington disease

  • Text
  • PDF
Abstract

Ependymal overexpression of brain-derived neurotrophic factor (BDNF) stimulates neuronal addition to the adult striatum, from subependymal progenitor cells. Noggin, by suppressing subependymal gliogenesis and increasing progenitor availability, potentiates this process. We asked whether BDNF/Noggin overexpression might be used to recruit new striatal neurons in R6/2 huntingtin transgenic mice. R6/2 mice injected with adenoviral BDNF and adenoviral Noggin (AdBDNF/AdNoggin) recruited BrdU+βIII-tubulin+ neurons, which developed as DARPP-32+ and GABAergic medium spiny neurons that expressed either enkephalin or substance P and extended fibers to the globus pallidus. Only AdBDNF/AdNoggin-treated R6/2 mice harbored migrating doublecortin-defined neuroblasts in their striata, and the new neurons expressed p27 as a marker of mitotic quiescence after parenchymal integration. AdBDNF/AdNoggin-treated R6/2 mice sustained their rotarod performance and open-field activity and survived longer than did AdNull-treated and untreated controls. Neither motor performance nor survival improved in R6/2 mice treated only with AdBDNF, and intraventricular infusion of the mitotic inhibitor Ara-C completely blocked the performance and survival effects of AdBDNF/AdNoggin, suggesting that the benefits of AdBDNF/AdNoggin derived from neuronal addition. Thus, BDNF and Noggin induced striatal neuronal regeneration, delayed motor impairment, and extended survival in R6/2 mice, suggesting a new therapeutic strategy in Huntington disease.

Authors

Sung-Rae Cho, Abdellatif Benraiss, Eva Chmielnicki, Amer Samdani, Aris Economides, Steven A. Goldman

×

Endothelial sulfonylurea receptor 1–regulated NCCa-ATP channels mediate progressive hemorrhagic necrosis following spinal cord injury
J. Marc Simard, … , S. Kyoon Woo, Volodymyr Gerzanich
J. Marc Simard, … , S. Kyoon Woo, Volodymyr Gerzanich
Published August 1, 2007
Citation Information: J Clin Invest. 2007;117(8):2105-2113. https://doi.org/10.1172/JCI32041.
View: Text | PDF

Endothelial sulfonylurea receptor 1–regulated NCCa-ATP channels mediate progressive hemorrhagic necrosis following spinal cord injury

  • Text
  • PDF
Abstract

Acute spinal cord injury (SCI) causes progressive hemorrhagic necrosis (PHN), a poorly understood pathological process characterized by hemorrhage and necrosis that leads to devastating loss of spinal cord tissue, cystic cavitation of the cord, and debilitating neurological dysfunction. Using a rodent model of severe cervical SCI, we tested the hypothesis that sulfonylurea receptor 1–regulated (SUR1-regulated) Ca2+-activated, [ATP]i-sensitive nonspecific cation (NCCa-ATP) channels are involved in PHN. In control rats, SCI caused a progressively expansive lesion with fragmentation of capillaries, hemorrhage that doubled in volume over 12 hours, tissue necrosis, and severe neurological dysfunction. SUR1 expression was upregulated in capillaries and neurons surrounding necrotic lesions. Patch clamp of cultured endothelial cells exposed to hypoxia showed that upregulation of SUR1 was associated with expression of functional SUR1-regulated NCCa-ATP channels. Following SCI, block of SUR1 by glibenclamide or repaglinide or suppression of Abcc8, which encodes for SUR1 by phosphorothioated antisense oligodeoxynucleotide essentially eliminated capillary fragmentation and progressive accumulation of blood, was associated with significant sparing of white matter tracts and a 3-fold reduction in lesion volume, and resulted in marked neurobehavioral functional improvement compared with controls. We conclude that SUR1-regulated NCCa-ATP channels in capillary endothelium are critical to development of PHN and constitute a major target for therapy in SCI.

Authors

J. Marc Simard, Orest Tsymbalyuk, Alexander Ivanov, Svetlana Ivanova, Sergei Bhatta, Zhihua Geng, S. Kyoon Woo, Volodymyr Gerzanich

×

Sensitization of TRPA1 by PAR2 contributes to the sensation of inflammatory pain
Yi Dai, … , Hiroki Yamanaka, Koichi Noguchi
Yi Dai, … , Hiroki Yamanaka, Koichi Noguchi
Published July 2, 2007
Citation Information: J Clin Invest. 2007;117(7):1979-1987. https://doi.org/10.1172/JCI30951.
View: Text | PDF | Corrigendum

Sensitization of TRPA1 by PAR2 contributes to the sensation of inflammatory pain

  • Text
  • PDF
Abstract

Proinflammatory agents trypsin and mast cell tryptase cleave and activate PAR2, which is expressed on sensory nerves to cause neurogenic inflammation. Transient receptor potential A1 (TRPA1) is an excitatory ion channel on primary sensory nerves of pain pathway. Here, we show that a functional interaction of PAR2 and TRPA1 in dorsal root ganglion (DRG) neurons could contribute to the sensation of inflammatory pain. Frequent colocalization of TRPA1 with PAR2 was found in rat DRG neurons. PAR2 activation increased the TRPA1 currents evoked by its agonists in HEK293 cells transfected with TRPA1, as well as DRG neurons. Application of phospholipase C (PLC) inhibitors or phosphatidylinositol-4,5-bisphosphate (PIP2) suppressed this potentiation. Decrease of plasma membrane PIP2 levels through antibody sequestration or PLC-mediated hydrolysis mimicked the potentiating effects of PAR2 activation at the cellular level. Thus, the increased TRPA1 sensitivity may have been due to activation of PLC, which releases the inhibition of TRPA1 from plasma membrane PIP2. These results identify for the first time to our knowledge a sensitization mechanism of TRPA1 and a novel mechanism through which trypsin or tryptase released in response to tissue inflammation might trigger the sensation of pain by TRPA1 activation.

Authors

Yi Dai, Shenglan Wang, Makoto Tominaga, Satoshi Yamamoto, Tetsuo Fukuoka, Tomohiro Higashi, Kimiko Kobayashi, Koichi Obata, Hiroki Yamanaka, Koichi Noguchi

×

Familial Alzheimer disease–linked mutations specifically disrupt Ca2+ leak function of presenilin 1
Omar Nelson, … , Bart de Strooper, Ilya Bezprozvanny
Omar Nelson, … , Bart de Strooper, Ilya Bezprozvanny
Published May 1, 2007
Citation Information: J Clin Invest. 2007;117(5):1230-1239. https://doi.org/10.1172/JCI30447.
View: Text | PDF

Familial Alzheimer disease–linked mutations specifically disrupt Ca2+ leak function of presenilin 1

  • Text
  • PDF
Abstract

Mutations in presenilins are responsible for approximately 40% of all early-onset familial Alzheimer disease (FAD) cases in which a genetic cause has been identified. In addition, a number of mutations in presenilin-1 (PS1) have been suggested to be associated with the occurrence of frontal temporal dementia (FTD). Presenilins are highly conserved transmembrane proteins that support cleavage of the amyloid precursor protein by γ-secretase. Recently, we discovered that presenilins also function as passive ER Ca2+ leak channels. Here we used planar lipid bilayer reconstitution assays and Ca2+ imaging experiments with presenilin-null mouse embryonic fibroblasts to analyze ER Ca2+ leak function of 6 FAD-linked PS1 mutants and 3 known FTD-associated PS1 mutants. We discovered that L166P, A246E, E273A, G384A, and P436Q FAD mutations in PS1 abolished ER Ca2+ leak function of PS1. In contrast, A79V FAD mutation or FTD-associated mutations (L113P, G183V, and Rins352) did not appear to affect ER Ca2+ leak function of PS1 in our experiments. We validated our findings in Ca2+ imaging experiments with primary fibroblasts obtained from an FAD patient possessing mutant PS1-A246E. Our results indicate that many FAD mutations in presenilins are loss-of-function mutations affecting ER Ca2+ leak activity. In contrast, none of the FTD-associated mutations affected ER Ca2+ leak function of PS1, indicating that the observed effects are disease specific. Our observations are consistent with the potential role of disturbed Ca2+ homeostasis in Alzheimer disease pathogenesis.

Authors

Omar Nelson, Huiping Tu, Tianhua Lei, Mostafa Bentahir, Bart de Strooper, Ilya Bezprozvanny

×

Role for protease activity in visceral pain in irritable bowel syndrome
Nicolas Cenac, … , Eldon Shaffer, Nathalie Vergnolle
Nicolas Cenac, … , Eldon Shaffer, Nathalie Vergnolle
Published March 1, 2007
Citation Information: J Clin Invest. 2007;117(3):636-647. https://doi.org/10.1172/JCI29255.
View: Text | PDF

Role for protease activity in visceral pain in irritable bowel syndrome

  • Text
  • PDF
Abstract

Mediators involved in the generation of symptoms in patients with irritable bowel syndrome (IBS) are poorly understood. Here we show that colonic biopsy samples from IBS patients release increased levels of proteolytic activity (arginine cleavage) compared to asymptomatic controls. This was dependent on the activation of NF-κB. In addition, increased proteolytic activity was measured in vivo, in colonic washes from IBS compared with control patients. Trypsin and tryptase expression and release were increased in colonic biopsies from IBS patients compared with control subjects. Biopsies from IBS patients (but not controls) released mediators that sensitized murine sensory neurons in culture. Sensitization was prevented by a serine protease inhibitor and was absent in neurons lacking functional protease-activated receptor–2 (PAR2). Supernatants from colonic biopsies of IBS patients, but not controls, also caused somatic and visceral hyperalgesia and allodynia in mice, when administered into the colon. These pronociceptive effects were inhibited by serine protease inhibitors and a PAR2 antagonist and were absent in PAR2-deficient mice. Our study establishes that proteases are released in IBS and that they can directly stimulate sensory neurons and generate hypersensitivity symptoms through the activation of PAR2.

Authors

Nicolas Cenac, Christopher N. Andrews, Marinella Holzhausen, Kevin Chapman, Graeme Cottrell, Patricia Andrade-Gordon, Martin Steinhoff, Giovanni Barbara, Paul Beck, Nigel W. Bunnett, Keith A. Sharkey, Jose Geraldo P. Ferraz, Eldon Shaffer, Nathalie Vergnolle

×

Trichostatin A increases SMN expression and survival in a mouse model of spinal muscular atrophy
Amy M. Avila, … , Kenneth H. Fischbeck, Charlotte J. Sumner
Amy M. Avila, … , Kenneth H. Fischbeck, Charlotte J. Sumner
Published March 1, 2007
Citation Information: J Clin Invest. 2007;117(3):659-671. https://doi.org/10.1172/JCI29562.
View: Text | PDF

Trichostatin A increases SMN expression and survival in a mouse model of spinal muscular atrophy

  • Text
  • PDF
Abstract

The inherited motor neuron disease spinal muscular atrophy (SMA) is caused by mutation of the telomeric survival motor neuron 1 (SMN1) gene with retention of the centromeric SMN2 gene. We sought to establish whether the potent and specific hydroxamic acid class of histone deacetylase (HDAC) inhibitors activates SMN2 gene expression in vivo and modulates the SMA disease phenotype when delivered after disease onset. Single intraperitoneal doses of 10 mg/kg trichostatin A (TSA) in nontransgenic and SMA model mice resulted in increased levels of acetylated H3 and H4 histones and modest increases in SMN gene expression. Repeated daily doses of TSA caused increases in both SMN2-derived transcript and SMN protein levels in neural tissues and muscle, which were associated with an improvement in small nuclear ribonucleoprotein (snRNP) assembly. When TSA was delivered daily beginning on P5, after the onset of weight loss and motor deficit, there was improved survival, attenuated weight loss, and enhanced motor behavior. Pathological analysis showed increased myofiber size and number and increased anterior horn cell size. These results indicate that the hydroxamic acid class of HDAC inhibitors activates SMN2 gene expression in vivo and has an ameliorating effect on the SMA disease phenotype when administered after disease onset.

Authors

Amy M. Avila, Barrington G. Burnett, Addis A. Taye, Francesca Gabanella, Melanie A. Knight, Parvana Hartenstein, Ziga Cizman, Nicholas A. Di Prospero, Livio Pellizzoni, Kenneth H. Fischbeck, Charlotte J. Sumner

×

Genetic evidence implicating DARPP-32 in human frontostriatal structure, function, and cognition
Andreas Meyer-Lindenberg, … , Joel E. Kleinman, Daniel R. Weinberger
Andreas Meyer-Lindenberg, … , Joel E. Kleinman, Daniel R. Weinberger
Published March 1, 2007
Citation Information: J Clin Invest. 2007;117(3):672-682. https://doi.org/10.1172/JCI30413.
View: Text | PDF

Genetic evidence implicating DARPP-32 in human frontostriatal structure, function, and cognition

  • Text
  • PDF
Abstract

Dopamine- and cAMP-regulated phosphoprotein of molecular weight 32 kDa (DARPP-32), encoded by PPP1R1B, is a pivotal integrator of information in dopaminoceptive neurons, regulating the response to neuroleptics, psychotomimetics, and drugs of abuse, and affecting striatal function and plasticity. Despite extensive preclinical work, there are almost no data on DARPP-32 function in humans. Here, we identify, through resequencing in 298 chromosomes, a frequent PPP1R1B haplotype predicting mRNA expression of PPP1R1B isoforms in postmortem human brain. This haplotype was associated with enhanced performance on several cognitive tests that depend on frontostriatal function. Multimodal imaging of healthy subjects revealed an impact of the haplotype on neostriatal volume, activation, and the functional connectivity of the prefrontal cortex. The haplotype was associated with the risk for schizophrenia in 1 family-based association analysis. Our convergent results identify a prefrontal-neostriatal system affected by variation in PPP1R1B and suggest that DARPP-32 plays a pivotal role in cognitive function and possibly in the pathogenesis of schizophrenia.

Authors

Andreas Meyer-Lindenberg, Richard E. Straub, Barbara K. Lipska, Beth A. Verchinski, Terry Goldberg, Joseph H. Callicott, Michael F. Egan, Stephen S. Huffaker, Venkata S. Mattay, Bhaskar Kolachana, Joel E. Kleinman, Daniel R. Weinberger

×
  • ← Previous
  • 1
  • 2
  • …
  • 37
  • 38
  • 39
  • …
  • 44
  • 45
  • Next →
DREAM suppression in Huntington’s disease
José Naranjo and colleagues reveal that downregulation of DREAM mediates derepression of ATF6, and this elevation of ATF6 plays an early neuroprotective role in Huntington’s disease…
Published January 11, 2016
Scientific Show StopperNeuroscience

Extra-cerebellar motor symptoms in Angelman’s syndrome
Caroline Bruinsma and colleagues evaluated cerebellar involvement in Angelman’s Syndrome motor deficits…
Published October 20, 2015
Scientific Show StopperNeuroscience

An epigenetic intervention for neurodegenerative diseases
Eva Benito and colleagues demonstrate that SAHA, a histone-deacetylase inhibitor, improves spatial memory and selectively regulates the neuronal epigenome in a mouse model of neurodegeneration…
Published August 17, 2015
Scientific Show StopperNeuroscience

Genetic and environmental interactions in Parkinson’s disease
Alevtina Zharikov and colleagues reveal that interplay between α-synuclein and environmental toxin exposure influences parkinsonian neurodegeneration…
Published June 15, 2015
Scientific Show StopperNeuroscience

TREM2 keeps myelinated axons under wraps
Pietro Poliani, Yaming Wang, and colleagues demonstrate that TREM2 deficiency reduces age-associated expansion of microglia and microglia-dependent remyelination…
Published April 20, 2015
Scientific Show StopperNeuroscience

Synergy among Parkinson’s disease-associated genes
Durga Meka and colleagues demonstrate that crosstalk between parkin and RET maintains mitochondrial integrity and protects dopaminergic neurons…
Published March 30, 2015
Scientific Show StopperNeuroscience

A model of periventricular leukomalacia
Tamar Licht, Talia Dor-Wollman and colleagues demonstrate that specific vulnerability of immature blood vessels surrounding ventricles predisposes to hypoxia-induced periventricular leukomalacia…
Published February 17, 2015
Scientific Show StopperNeuroscience
Advertisement
Follow JCI:
Copyright © 2021 American Society for Clinical Investigation
ISSN: 0021-9738 (print), 1558-8238 (online)

Sign up for email alerts