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  1. Article ; Online: Navigating Like a Fly:

    Gajardo, Ivana / Guerra, Simón / Campusano, Jorge M

    International journal of molecular sciences

    2023  Volume 24, Issue 5

    Abstract: Serotonin is a monoamine that acts in vertebrates and invertebrates as a modulator promoting changes in the structure and activity of brain areas relevant to animal behavior, ranging from sensory perception to learning and memory. Whether serotonin ... ...

    Abstract Serotonin is a monoamine that acts in vertebrates and invertebrates as a modulator promoting changes in the structure and activity of brain areas relevant to animal behavior, ranging from sensory perception to learning and memory. Whether serotonin contributes in
    MeSH term(s) Animals ; Humans ; Drosophila melanogaster/metabolism ; Serotonin/metabolism ; Spatial Navigation ; Drosophila/metabolism ; Synaptic Transmission
    Chemical Substances Serotonin (333DO1RDJY)
    Language English
    Publishing date 2023-02-23
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms24054407
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Whole-brain neuronal MCT2 lactate transporter expression links metabolism to human brain structure and function.

    Medel, Vicente / Crossley, Nicolás / Gajardo, Ivana / Muller, Eli / Barros, L Felipe / Shine, James M / Sierralta, Jimena

    Proceedings of the National Academy of Sciences of the United States of America

    2022  Volume 119, Issue 33, Page(s) e2204619119

    Abstract: Brain activity is constrained by local availability of chemical energy, which is generated through compartmentalized metabolic processes. By analyzing data of whole human brain gene expression, we characterize the spatial distribution of seven glucose ... ...

    Abstract Brain activity is constrained by local availability of chemical energy, which is generated through compartmentalized metabolic processes. By analyzing data of whole human brain gene expression, we characterize the spatial distribution of seven glucose and monocarboxylate membrane transporters that mediate astrocyte-neuron lactate shuttle transfer of energy. We found that the gene coding for neuronal MCT2 is the only gene enriched in cerebral cortex where its abundance is inversely correlated with cortical thickness. Coexpression network analysis revealed that MCT2 was the only gene participating in an organized gene cluster enriched in K[Formula: see text] dynamics. Indeed, the expression of K[Formula: see text] subunits, which mediate lactate increases with spiking activity, is spatially coupled to MCT2 distribution. Notably, MCT2 expression correlated with fluorodeoxyglucose positron emission tomography task-dependent glucose utilization. Finally, the MCT2 messenger RNA gradient closely overlaps with functional MRI brain regions associated with attention, arousal, and stress. Our results highlight neuronal MCT2 lactate transporter as a key component of the cross-talk between astrocytes and neurons and a link between metabolism, cortical structure, and state-dependent brain function.
    MeSH term(s) Arousal ; Attention ; Biological Transport ; Cerebral Cortex/metabolism ; Cerebral Cortex/ultrastructure ; Glucose/metabolism ; Humans ; Lactic Acid/metabolism ; Monocarboxylic Acid Transporters/genetics ; Monocarboxylic Acid Transporters/metabolism ; Neurons/metabolism ; Positron-Emission Tomography ; Psychological Distress
    Chemical Substances Monocarboxylic Acid Transporters ; SLC16A7 protein, human ; Lactic Acid (33X04XA5AT) ; Glucose (IY9XDZ35W2)
    Language English
    Publishing date 2022-08-08
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.2204619119
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 1148: Show issues Location:
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    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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  3. Article ; Online: A centronuclear myopathy-causing mutation in dynamin-2 disrupts neuronal morphology and excitatory synaptic transmission in a murine model of the disease.

    Arriagada-Diaz, Jorge / Flores-Muñoz, Carolina / Gómez-Soto, Bárbara / Labraña-Allende, Marjorie / Mattar-Araos, Michelle / Prado-Vega, Lorena / Hinostroza, Fernando / Gajardo, Ivana / Guerra-Fernández, María José / Bevilacqua, Jorge A / Cárdenas, Ana M / Bitoun, Marc / Ardiles, Alvaro O / Gonzalez-Jamett, Arlek M

    Neuropathology and applied neurobiology

    2023  Volume 49, Issue 4, Page(s) e12918

    Abstract: Aims: Dynamin-2 is a large GTPase, a member of the dynamin superfamily that regulates membrane remodelling and cytoskeleton dynamics. Mutations in the dynamin-2 gene (DNM2) cause autosomal dominant centronuclear myopathy (CNM), a congenital ... ...

    Abstract Aims: Dynamin-2 is a large GTPase, a member of the dynamin superfamily that regulates membrane remodelling and cytoskeleton dynamics. Mutations in the dynamin-2 gene (DNM2) cause autosomal dominant centronuclear myopathy (CNM), a congenital neuromuscular disorder characterised by progressive weakness and atrophy of the skeletal muscles. Cognitive defects have been reported in some DNM2-linked CNM patients suggesting that these mutations can also affect the central nervous system (CNS). Here we studied how a dynamin-2 CNM-causing mutation influences the CNS function.
    Methods: Heterozygous mice harbouring the p.R465W mutation in the dynamin-2 gene (HTZ), the most common causing autosomal dominant CNM, were used as disease model. We evaluated dendritic arborisation and spine density in hippocampal cultured neurons, analysed excitatory synaptic transmission by electrophysiological field recordings in hippocampal slices, and evaluated cognitive function by performing behavioural tests.
    Results: HTZ hippocampal neurons exhibited reduced dendritic arborisation and lower spine density than WT neurons, which was reversed by transfecting an interference RNA against the dynamin-2 mutant allele. Additionally, HTZ mice showed defective hippocampal excitatory synaptic transmission and reduced recognition memory compared to the WT condition.
    Conclusion: Our findings suggest that the dynamin-2 p.R465W mutation perturbs the synaptic and cognitive function in a CNM mouse model and support the idea that this GTPase plays a key role in regulating neuronal morphology and excitatory synaptic transmission in the hippocampus.
    MeSH term(s) Animals ; Mice ; Disease Models, Animal ; Dynamin II/genetics ; Dynamin II/metabolism ; Muscle, Skeletal/metabolism ; Mutation ; Myopathies, Structural, Congenital/genetics ; Neurons/metabolism ; Synaptic Transmission
    Chemical Substances Dynamin II (EC 3.6.5.5) ; DNM2 protein, mouse (EC 3.6.5.5)
    Language English
    Publishing date 2023-04-16
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 80371-6
    ISSN 1365-2990 ; 0305-1846
    ISSN (online) 1365-2990
    ISSN 0305-1846
    DOI 10.1111/nan.12918
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 1241: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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  4. Article: Acute Pannexin 1 Blockade Mitigates Early Synaptic Plasticity Defects in a Mouse Model of Alzheimer's Disease.

    Flores-Muñoz, Carolina / Gómez, Bárbara / Mery, Elena / Mujica, Paula / Gajardo, Ivana / Córdova, Claudio / Lopez-Espíndola, Daniela / Durán-Aniotz, Claudia / Hetz, Claudio / Muñoz, Pablo / Gonzalez-Jamett, Arlek M / Ardiles, Álvaro O

    Frontiers in cellular neuroscience

    2020  Volume 14, Page(s) 46

    Abstract: Synaptic loss induced by soluble oligomeric forms of the amyloid β peptide (sAβos) is one of the earliest events in Alzheimer's disease (AD) and is thought to be the major cause of the cognitive deficits. These abnormalities rely on defects in synaptic ... ...

    Abstract Synaptic loss induced by soluble oligomeric forms of the amyloid β peptide (sAβos) is one of the earliest events in Alzheimer's disease (AD) and is thought to be the major cause of the cognitive deficits. These abnormalities rely on defects in synaptic plasticity, a series of events manifested as activity-dependent modifications in synaptic structure and function. It has been reported that pannexin 1 (Panx1), a nonselective channel implicated in cell communication and intracellular signaling, modulates the induction of excitatory synaptic plasticity under physiological contexts and contributes to neuronal death under inflammatory conditions. Here, we decided to study the involvement of Panx1 in functional and structural defects observed in excitatory synapses of the amyloid precursor protein (APP)/presenilin 1 (PS1) transgenic (Tg) mice, an animal model of AD. We found an age-dependent increase in the Panx1 expression that correlates with increased Aβ levels in hippocampal tissue from Tg mice. Congruently, we also observed an exacerbated Panx1 activity upon basal conditions and in response to glutamate receptor activation. The acute inhibition of Panx1 activity with the drug probenecid (PBN) did not change neurodegenerative parameters such as amyloid deposition or astrogliosis, but it significantly reduced excitatory synaptic defects in the AD model by normalizing long-term potentiation (LTP) and depression and improving dendritic arborization and spine density in hippocampal neurons of the Tg mice. These results suggest a major contribution of Panx1 in the early mechanisms leading to the synaptopathy in AD. Indeed, PBN induced a reduction in the activation of p38 mitogen-activated protein kinase (MAPK), a kinase widely implicated in the early neurotoxic signaling in AD. Our data strongly suggest that an enhanced expression and activation of Panx1 channels contribute to the Aβ-induced cascades leading to synaptic dysfunction in AD.
    Language English
    Publishing date 2020-03-19
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2452963-1
    ISSN 1662-5102
    ISSN 1662-5102
    DOI 10.3389/fncel.2020.00046
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Lack of Pannexin 1 Alters Synaptic GluN2 Subunit Composition and Spatial Reversal Learning in Mice.

    Gajardo, Ivana / Salazar, Claudia S / Lopez-Espíndola, Daniela / Estay, Carolina / Flores-Muñoz, Carolina / Elgueta, Claudio / Gonzalez-Jamett, Arlek M / Martínez, Agustín D / Muñoz, Pablo / Ardiles, Álvaro O

    Frontiers in molecular neuroscience

    2018  Volume 11, Page(s) 114

    Abstract: Long-term potentiation (LTP) and long-term depression (LTD) are two forms of synaptic plasticity that have been considered as the cellular substrate of memory formation. Although LTP has received considerable more attention, recent evidences indicate ... ...

    Abstract Long-term potentiation (LTP) and long-term depression (LTD) are two forms of synaptic plasticity that have been considered as the cellular substrate of memory formation. Although LTP has received considerable more attention, recent evidences indicate that LTD plays also important roles in the acquisition and storage of novel information in the brain. Pannexin 1 (Panx1) is a membrane protein that forms non-selective channels which have been shown to modulate the induction of hippocampal synaptic plasticity. Animals lacking Panx1 or blockade of Pannexin 1 channels precludes the induction of LTD and facilitates LTP. To evaluate if the absence of Panx1 also affects the acquisition of rapidly changing information we trained Panx1 knockout (KO) mice and wild type (WT) littermates in a visual and hidden version of the Morris water maze (MWM). We found that KO mice find the hidden platform similarly although slightly quicker than WT animals, nonetheless, when the hidden platform was located in the opposite quadrant (OQ) to the previous learned location, KO mice spent significantly more time in the previous quadrant than in the new location indicating that the absence of Panx1 affects the reversion of a previously acquired spatial memory. Consistently, we observed changes in the content of synaptic proteins critical to LTD, such as GluN2 subunits of N-methyl-D-aspartate receptors (NMDARs), which changed their contribution to synaptic plasticity in conditions of Panx1 ablation. Our findings give further support to the role of Panx1 channels on the modulation of synaptic plasticity induction, learning and memory processes.
    Language English
    Publishing date 2018-04-10
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2452967-9
    ISSN 1662-5099
    ISSN 1662-5099
    DOI 10.3389/fnmol.2018.00114
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: IRE1 signaling exacerbates Alzheimer's disease pathogenesis.

    Duran-Aniotz, Claudia / Cornejo, Victor Hugo / Espinoza, Sandra / Ardiles, Álvaro O / Medinas, Danilo B / Salazar, Claudia / Foley, Andrew / Gajardo, Ivana / Thielen, Peter / Iwawaki, Takao / Scheper, Wiep / Soto, Claudio / Palacios, Adrian G / Hoozemans, Jeroen J M / Hetz, Claudio

    Acta neuropathologica

    2017  Volume 134, Issue 3, Page(s) 489–506

    Abstract: Altered proteostasis is a salient feature of Alzheimer's disease (AD), highlighting the occurrence of endoplasmic reticulum (ER) stress and abnormal protein aggregation. ER stress triggers the activation of the unfolded protein response (UPR), a ... ...

    Abstract Altered proteostasis is a salient feature of Alzheimer's disease (AD), highlighting the occurrence of endoplasmic reticulum (ER) stress and abnormal protein aggregation. ER stress triggers the activation of the unfolded protein response (UPR), a signaling pathway that enforces adaptive programs to sustain proteostasis or eliminate terminally damaged cells. IRE1 is an ER-located kinase and endoribonuclease that operates as a major stress transducer, mediating both adaptive and proapoptotic programs under ER stress. IRE1 signaling controls the expression of the transcription factor XBP1, in addition to degrade several RNAs. Importantly, a polymorphism in the XBP1 promoter was suggested as a risk factor to develop AD. Here, we demonstrate a positive correlation between the progression of AD histopathology and the activation of IRE1 in human brain tissue. To define the significance of the UPR to AD, we targeted IRE1 expression in a transgenic mouse model of AD. Despite initial expectations that IRE1 signaling may protect against AD, genetic ablation of the RNase domain of IRE1 in the nervous system significantly reduced amyloid deposition, the content of amyloid β oligomers, and astrocyte activation. IRE1 deficiency fully restored the learning and memory capacity of AD mice, associated with improved synaptic function and improved long-term potentiation (LTP). At the molecular level, IRE1 deletion reduced the expression of amyloid precursor protein (APP) in cortical and hippocampal areas of AD mice. In vitro experiments demonstrated that inhibition of IRE1 downstream signaling reduces APP steady-state levels, associated with its retention at the ER followed by proteasome-mediated degradation. Our findings uncovered an unanticipated role of IRE1 in the pathogenesis of AD, offering a novel target for disease intervention.
    MeSH term(s) Alzheimer Disease/genetics ; Alzheimer Disease/metabolism ; Alzheimer Disease/pathology ; Amyloid beta-Peptides/metabolism ; Amyloid beta-Protein Precursor/metabolism ; Animals ; Disease Models, Animal ; Disease Progression ; Endoplasmic Reticulum Stress/physiology ; Hippocampus/metabolism ; Hippocampus/pathology ; Humans ; Long-Term Potentiation/physiology ; Membrane Proteins/genetics ; Membrane Proteins/metabolism ; Mice ; Mice, Transgenic ; Neurons/metabolism ; Neurons/pathology ; Protein-Serine-Threonine Kinases/genetics ; Protein-Serine-Threonine Kinases/metabolism ; Signal Transduction/physiology ; Spatial Memory/physiology ; Unfolded Protein Response/physiology
    Chemical Substances Amyloid beta-Peptides ; Amyloid beta-Protein Precursor ; Membrane Proteins ; Ern2 protein, mouse (EC 2.7.1.-) ; Protein-Serine-Threonine Kinases (EC 2.7.11.1)
    Language English
    Publishing date 2017-09
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1079-0
    ISSN 1432-0533 ; 0001-6322
    ISSN (online) 1432-0533
    ISSN 0001-6322
    DOI 10.1007/s00401-017-1694-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Ui II Zs.188: Show issues Location:
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