---
_id: '11196'
abstract:
- lang: eng
  text: "One of the fundamental questions in Neuroscience is how the structure of
    synapses and their physiological properties are related. While synaptic transmission
    remains a dynamic process, electron microscopy provides images with comparably
    low temporal resolution (Studer et al., 2014). The current work overcomes this
    challenge and describes an improved “Flash and Freeze” technique (Watanabe et
    al., 2013a; Watanabe et al., 2013b) to study synaptic transmission at the hippocampal
    mossy fiber-CA3 pyramidal neuron synapses, using mouse acute brain slices and
    organotypic slices culture. The improved method allowed for selective stimulation
    of presynaptic mossy fiber boutons and the observation of synaptic vesicle pool
    dynamics at the active zones. Our results uncovered several intriguing morphological
    features of mossy fiber boutons. First, the docked vesicle pool was largely depleted
    (more than 70%) after stimulation, implying that the docked synaptic vesicles
    pool and readily releasable pool are vastly overlapping in mossy fiber boutons.
    Second, the synaptic vesicles are skewed towards larger diameters, displaying
    a wide range of sizes. An increase in the mean diameter of synaptic vesicles,
    after single and repetitive stimulation, suggests that smaller vesicles have a
    higher release probability. Third, we observed putative endocytotic structures
    after moderate light stimulation, matching the timing of previously described
    ultrafast endocytosis (Watanabe et al., 2013a; Delvendahl et al., 2016). \r\n\tIn
    addition, synaptic transmission depends on a sophisticated system of protein machinery
    and calcium channels (Südhof, 2013b), which amplifies the challenge in studying
    synaptic communication as these interactions can be potentially modified during
    synaptic plasticity. And although recent study elucidated the potential correlation
    between physiological and morphological properties of synapses during synaptic
    plasticity (Vandael et al., 2020), the molecular underpinning of it remains unknown.
    Thus, the presented work tries to overcome this challenge and aims to pinpoint
    changes in the molecular architecture at hippocampal mossy fiber bouton synapses
    during short- and long-term potentiation (STP and LTP), we combined chemical potentiation,
    with the application of a cyclic adenosine monophosphate agonist (i.e. forskolin)
    and freeze-fracture replica immunolabelling. This method allowed the localization
    of membrane-bound proteins with nanometer precision within the active zone, in
    particular, P/Q-type calcium channels and synaptic vesicle priming proteins Munc13-1/2.
    First, we found that the number of clusters of Munc13-1 in the mossy fiber bouton
    active zone increased significantly during STP, but decreased to lower than the
    control value during LTP. Secondly, although the distance between the calcium
    channels and Munc13-1s did not change after induction of STP, it shortened during
    the LTP phase. Additionally, forskolin did not affect Munc13-2 distribution during
    STP and LTP. These results indicate the existence of two distinct mechanisms that
    govern STP and LTP at mossy fiber bouton synapses: an increase in the readily
    realizable pool in the case of STP and a potential increase in release probability
    during LTP. “Flash and freeze” and functional electron microscopy, are versatile
    methods that can be successfully applied to intact brain circuits to study synaptic
    transmission even at the molecular level.\r\n"
acknowledged_ssus:
- _id: EM-Fac
- _id: PreCl
alternative_title:
- ISTA Thesis
article_processing_charge: No
author:
- first_name: Olena
  full_name: Kim, Olena
  id: 3F8ABDDA-F248-11E8-B48F-1D18A9856A87
  last_name: Kim
citation:
  ama: Kim O. Nanoarchitecture of hippocampal mossy fiber-CA3 pyramidal neuron synapses.
    2022. doi:<a href="https://doi.org/10.15479/at:ista:11196">10.15479/at:ista:11196</a>
  apa: Kim, O. (2022). <i>Nanoarchitecture of hippocampal mossy fiber-CA3 pyramidal
    neuron synapses</i>. Institute of Science and Technology Austria. <a href="https://doi.org/10.15479/at:ista:11196">https://doi.org/10.15479/at:ista:11196</a>
  chicago: Kim, Olena. “Nanoarchitecture of Hippocampal Mossy Fiber-CA3 Pyramidal
    Neuron Synapses.” Institute of Science and Technology Austria, 2022. <a href="https://doi.org/10.15479/at:ista:11196">https://doi.org/10.15479/at:ista:11196</a>.
  ieee: O. Kim, “Nanoarchitecture of hippocampal mossy fiber-CA3 pyramidal neuron
    synapses,” Institute of Science and Technology Austria, 2022.
  ista: Kim O. 2022. Nanoarchitecture of hippocampal mossy fiber-CA3 pyramidal neuron
    synapses. Institute of Science and Technology Austria.
  mla: Kim, Olena. <i>Nanoarchitecture of Hippocampal Mossy Fiber-CA3 Pyramidal Neuron
    Synapses</i>. Institute of Science and Technology Austria, 2022, doi:<a href="https://doi.org/10.15479/at:ista:11196">10.15479/at:ista:11196</a>.
  short: O. Kim, Nanoarchitecture of Hippocampal Mossy Fiber-CA3 Pyramidal Neuron
    Synapses, Institute of Science and Technology Austria, 2022.
date_created: 2022-04-20T09:47:12Z
date_published: 2022-04-20T00:00:00Z
date_updated: 2023-08-18T06:31:52Z
day: '20'
ddc:
- '570'
degree_awarded: PhD
department:
- _id: PeJo
- _id: GradSch
doi: 10.15479/at:ista:11196
ec_funded: 1
file:
- access_level: open_access
  checksum: 1616a8bf6f13a57c892dac873dcd0936
  content_type: application/pdf
  creator: okim
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  date_updated: 2023-04-20T22:30:03Z
  embargo: 2023-04-19
  file_id: '11220'
  file_name: Olena_KIM_thesis_final.pdf
  file_size: 21273537
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  date_created: 2022-04-20T14:22:56Z
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has_accepted_license: '1'
language:
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month: '04'
oa: 1
oa_version: Published Version
page: '132'
project:
- _id: 25BAF7B2-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '708497'
  name: Presynaptic calcium channels distribution and impact on coupling at the hippocampal
    mossy fiber synapse
- _id: 25B7EB9E-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '692692'
  name: Biophysics and circuit function of a giant cortical glumatergic synapse
- _id: 25C3DBB6-B435-11E9-9278-68D0E5697425
  call_identifier: FWF
  grant_number: W01205
  name: Zellkommunikation in Gesundheit und Krankheit
- _id: 25C5A090-B435-11E9-9278-68D0E5697425
  call_identifier: FWF
  grant_number: Z00312
  name: The Wittgenstein Prize
publication_identifier:
  issn:
  - 2663-337X
publication_status: published
publisher: Institute of Science and Technology Austria
related_material:
  record:
  - id: '11222'
    relation: part_of_dissertation
    status: public
  - id: '7473'
    relation: part_of_dissertation
    status: public
status: public
supervisor:
- first_name: Peter M
  full_name: Jonas, Peter M
  id: 353C1B58-F248-11E8-B48F-1D18A9856A87
  last_name: Jonas
  orcid: 0000-0001-5001-4804
title: Nanoarchitecture of hippocampal mossy fiber-CA3 pyramidal neuron synapses
tmp:
  image: /images/cc_by_nc_nd.png
  legal_code_url: https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode
  name: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
    (CC BY-NC-ND 4.0)
  short: CC BY-NC-ND (4.0)
type: dissertation
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
year: '2022'
...
---
_id: '6363'
abstract:
- lang: eng
  text: "Distinguishing  between  similar  experiences  is  achieved  by  the  brain
    \ in  a  process called  pattern  separation.  In  the  hippocampus,  pattern
    \ separation  reduces  the interference of memories and increases the storage
    capacity by decorrelating similar inputs  patterns  of  neuronal  activity  into
    \ non-overlapping output  firing  patterns. Winners-take-all  (WTA)  mechanism
    \ is  a  theoretical  model  for  pattern  separation  in which  a  \"winner\"
    \ cell  suppresses  the  activity  of  the  neighboring  neurons  through feedback
    inhibition. However, if the network properties of the dentate gyrus support WTA
    as a biologically conceivable model remains unknown. Here, we showed that the
    connectivity rules of PV+interneurons and their synaptic properties are optimizedfor
    efficient pattern separation. We found using multiple whole-cell in vitrorecordings
    that PV+interneurons mainly connect to granule cells (GC) through lateral inhibition,
    a form of  feedback  inhibition  in  which  a  GC  inhibits  other  GCs  but  not
    \ itself  through  the activation of PV+interneurons. Thus, lateral inhibition
    between GC–PV+interneurons was ~10 times more abundant than recurrent connections.
    Furthermore, the GC–PV+interneuron  connectivity  was  more  spatially  confined
    \ but  less  abundant  than  PV+interneurons–GC  connectivity,  leading  to  an
    \ asymmetrical  distribution  of  excitatory and inhibitory connectivity. Our
    network model of the dentate gyrus with incorporated real connectivity rules efficiently
    decorrelates neuronal activity patterns using WTA as the  primary  mechanism.
    \ This  process  relied  on  lateral  inhibition,  fast-signaling properties  of
    \ PV+interneurons  and  the  asymmetrical  distribution  of  excitatory  and inhibitory
    connectivity. Finally, we found that silencing the activity of PV+interneurons
    in  vivoleads  to  acute  deficits  in  discrimination  between  similar  environments,
    suggesting  that  PV+interneuron  networks  are  necessary  for  behavioral  relevant
    computations.  Our   results   demonstrate   that   PV+interneurons  possess  unique
    connectivity  and  fast  signaling  properties  that confer  to  the  dentate
    \ gyrus  network properties that allow the emergence of pattern separation. Thus,
    our results contribute to the knowledge of how specific forms of network organization
    underlie sophisticated types of information processing. \r\n"
alternative_title:
- ISTA Thesis
article_processing_charge: No
author:
- first_name: 'Claudia '
  full_name: 'Espinoza Martinez, Claudia '
  id: 31FFEE2E-F248-11E8-B48F-1D18A9856A87
  last_name: Espinoza Martinez
  orcid: 0000-0003-4710-2082
citation:
  ama: Espinoza Martinez C. Parvalbumin+ interneurons enable efficient pattern separation
    in hippocampal microcircuits. 2019. doi:<a href="https://doi.org/10.15479/AT:ISTA:6363">10.15479/AT:ISTA:6363</a>
  apa: Espinoza Martinez, C. (2019). <i>Parvalbumin+ interneurons enable efficient
    pattern separation in hippocampal microcircuits</i>. Institute of Science and
    Technology Austria. <a href="https://doi.org/10.15479/AT:ISTA:6363">https://doi.org/10.15479/AT:ISTA:6363</a>
  chicago: Espinoza Martinez, Claudia . “Parvalbumin+ Interneurons Enable Efficient
    Pattern Separation in Hippocampal Microcircuits.” Institute of Science and Technology
    Austria, 2019. <a href="https://doi.org/10.15479/AT:ISTA:6363">https://doi.org/10.15479/AT:ISTA:6363</a>.
  ieee: C. Espinoza Martinez, “Parvalbumin+ interneurons enable efficient pattern
    separation in hippocampal microcircuits,” Institute of Science and Technology
    Austria, 2019.
  ista: Espinoza Martinez C. 2019. Parvalbumin+ interneurons enable efficient pattern
    separation in hippocampal microcircuits. Institute of Science and Technology Austria.
  mla: Espinoza Martinez, Claudia. <i>Parvalbumin+ Interneurons Enable Efficient Pattern
    Separation in Hippocampal Microcircuits</i>. Institute of Science and Technology
    Austria, 2019, doi:<a href="https://doi.org/10.15479/AT:ISTA:6363">10.15479/AT:ISTA:6363</a>.
  short: C. Espinoza Martinez, Parvalbumin+ Interneurons Enable Efficient Pattern
    Separation in Hippocampal Microcircuits, Institute of Science and Technology Austria,
    2019.
date_created: 2019-04-30T11:56:10Z
date_published: 2019-04-30T00:00:00Z
date_updated: 2023-09-15T12:03:48Z
day: '30'
ddc:
- '570'
degree_awarded: PhD
department:
- _id: PeJo
doi: 10.15479/AT:ISTA:6363
file:
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  content_type: application/pdf
  creator: cespinoza
  date_created: 2019-05-07T16:00:39Z
  date_updated: 2021-02-11T11:17:15Z
  embargo: 2020-05-09
  file_id: '6389'
  file_name: Espinozathesis_all2.pdf
  file_size: 13966891
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  creator: cespinoza
  date_created: 2019-05-07T16:00:48Z
  date_updated: 2020-07-14T12:47:28Z
  embargo_to: open_access
  file_id: '6390'
  file_name: Espinoza_Thesis.docx
  file_size: 11159900
  relation: source_file
file_date_updated: 2021-02-11T11:17:15Z
has_accepted_license: '1'
language:
- iso: eng
month: '04'
oa: 1
oa_version: Published Version
page: '140'
publication_identifier:
  isbn:
  - 978-3-99078-000-8
  issn:
  - 2663-337X
publication_status: published
publisher: Institute of Science and Technology Austria
related_material:
  record:
  - id: '21'
    relation: part_of_dissertation
    status: public
status: public
supervisor:
- first_name: Peter M
  full_name: Jonas, Peter M
  id: 353C1B58-F248-11E8-B48F-1D18A9856A87
  last_name: Jonas
  orcid: 0000-0001-5001-4804
title: Parvalbumin+ interneurons enable efficient pattern separation in hippocampal
  microcircuits
type: dissertation
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
year: '2019'
...
---
_id: '324'
abstract:
- lang: eng
  text: Neuronal networks in the brain consist of two main types of neuron, glutamatergic
    principal neurons and GABAergic interneurons. Although these interneurons only
    represent 10–20% of the whole population, they mediate feedback and feedforward
    inhibition and are involved in the generation of high-frequency network oscillations.
    A hallmark functional property of GABAergic interneurons, especially of the parvalbumin‑expressing
    (PV+) subtypes, is the speed of signaling at their output synapse across species
    and brain regions. Several molecular and subcellular factors may underlie the
    submillisecond signaling at GABAergic synapses. Such as the selective use of P/Q
    type Ca2+ channels and the tight coupling between Ca2+ channels and Ca2+ sensors
    of exocytosis. However, whether the molecular identity of the release sensor contributes
    to these signaling properties remains unclear. Besides, these interneurons are
    mainly show depression in response to train of stimuli. How could they keep sufficient
    release to control the activity of postsynaptic principal neurons during high
    network activity, is largely elusive. For my Ph.D. work, we firstly examined the
    Ca2+ sensor of exocytosis at the GABAergic basket cell (BC) to Purkinje cell (PC)
    synapse in the cerebellum. Immunolabeling suggested that BC terminals selectively
    expressed synaptotagmin 2 (Syt2), whereas synaptotagmin 1 (Syt1) was enriched
    in excitatory terminals. Genetic elimination of Syt2 reduced action potential-evoked
    release to ~10% compared to the wild-type control, identifying Syt2 as the major
    Ca2+ sensor at BC‑PC synapses. Differential adenovirus-mediated rescue revealed
    Syt2 triggered release with shorter latency and higher temporal precision, and
    mediated faster vesicle pool replenishment than Syt1. Furthermore, deletion of
    Syt2 severely reduced and delayed disynaptic inhibition following parallel fiber
    stimulation. Thus, the selective use of Syt2 as the release sensor at BC–PC synapse
    ensures fast feedforward inhibition in cerebellar microcircuits. Additionally,
    we tested the function of another synaptotagmin member, Syt7, for inhibitory synaptic
    transmission at the BC–PC synapse. Syt7 is thought to be a Ca2+ sensor that mediates
    asynchronous transmitter release and facilitation at synapses. However, it is
    strongly expressed in fast-spiking, PV+ GABAergic interneurons and the output
    synapses of these neurons produce only minimal asynchronous release and show depression
    rather than facilitation. How could Syt7, a facilitation sensor, contribute to
    the depressed inhibitory synaptic transmission needs to be further investigated
    and understood. Our results indicated that at the BC–PC synapse, Syt7 contributes
    to asynchronous release, pool replenishment and facilitation. In combination,
    these three effects ensure efficient transmitter release during high‑frequency
    activity and guarantee frequency independence of inhibition. Taken together, our
    results confirmed that Syt2, which has the fastest kinetic properties among all
    synaptotagmin members, is mainly used by the inhibitory BC‑PC synapse for synaptic
    transmission, contributing to the speed and temporal precision of transmitter
    release. Furthermore, we showed that Syt7, another highly expressed synaptotagmin
    member in the output synapses of cerebellar BCs, is used for ensuring efficient
    inhibitor synaptic transmission during high activity.
alternative_title:
- ISTA Thesis
article_processing_charge: No
author:
- first_name: Chong
  full_name: Chen, Chong
  id: 3DFD581A-F248-11E8-B48F-1D18A9856A87
  last_name: Chen
citation:
  ama: Chen C. Synaptotagmins ensure speed and efficiency of inhibitory neurotransmitter
    release. 2018. doi:<a href="https://doi.org/10.15479/AT:ISTA:th_997">10.15479/AT:ISTA:th_997</a>
  apa: Chen, C. (2018). <i>Synaptotagmins ensure speed and efficiency of inhibitory
    neurotransmitter release</i>. Institute of Science and Technology Austria. <a
    href="https://doi.org/10.15479/AT:ISTA:th_997">https://doi.org/10.15479/AT:ISTA:th_997</a>
  chicago: Chen, Chong. “Synaptotagmins Ensure Speed and Efficiency of Inhibitory
    Neurotransmitter Release.” Institute of Science and Technology Austria, 2018.
    <a href="https://doi.org/10.15479/AT:ISTA:th_997">https://doi.org/10.15479/AT:ISTA:th_997</a>.
  ieee: C. Chen, “Synaptotagmins ensure speed and efficiency of inhibitory neurotransmitter
    release,” Institute of Science and Technology Austria, 2018.
  ista: Chen C. 2018. Synaptotagmins ensure speed and efficiency of inhibitory neurotransmitter
    release. Institute of Science and Technology Austria.
  mla: Chen, Chong. <i>Synaptotagmins Ensure Speed and Efficiency of Inhibitory Neurotransmitter
    Release</i>. Institute of Science and Technology Austria, 2018, doi:<a href="https://doi.org/10.15479/AT:ISTA:th_997">10.15479/AT:ISTA:th_997</a>.
  short: C. Chen, Synaptotagmins Ensure Speed and Efficiency of Inhibitory Neurotransmitter
    Release, Institute of Science and Technology Austria, 2018.
date_created: 2018-12-11T11:45:49Z
date_published: 2018-03-01T00:00:00Z
date_updated: 2023-09-27T12:26:03Z
day: '01'
ddc:
- '571'
degree_awarded: PhD
department:
- _id: PeJo
doi: 10.15479/AT:ISTA:th_997
file:
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  date_created: 2018-12-12T10:13:58Z
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  file_id: '5046'
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  file_size: 8719458
  relation: main_file
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  checksum: f7d7260029a5fbb5c982db61328ade52
  content_type: application/octet-stream
  creator: dernst
  date_created: 2019-04-05T09:25:26Z
  date_updated: 2020-07-14T12:46:04Z
  file_id: '6221'
  file_name: 2018_Thesis_chong_source.pages
  file_size: 47841940
  relation: source_file
file_date_updated: 2020-07-14T12:46:04Z
has_accepted_license: '1'
language:
- iso: eng
month: '03'
oa: 1
oa_version: Published Version
page: '110'
publication_identifier:
  issn:
  - 2663-337X
publication_status: published
publisher: Institute of Science and Technology Austria
publist_id: '7541'
pubrep_id: '997'
related_material:
  record:
  - id: '1117'
    relation: part_of_dissertation
    status: public
  - id: '749'
    relation: part_of_dissertation
    status: public
status: public
supervisor:
- first_name: Peter M
  full_name: Jonas, Peter M
  id: 353C1B58-F248-11E8-B48F-1D18A9856A87
  last_name: Jonas
  orcid: 0000-0001-5001-4804
title: Synaptotagmins ensure speed and efficiency of inhibitory neurotransmitter release
tmp:
  image: /images/cc_by.png
  legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
  name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
  short: CC BY (4.0)
type: dissertation
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
year: '2018'
...
---
_id: '1396'
abstract:
- lang: eng
  text: CA3 pyramidal neurons are thought to pay a key role in memory storage and
    pattern completion by activity-dependent synaptic plasticity between CA3-CA3 recurrent
    excitatory synapses. To examine the induction rules of synaptic plasticity at
    CA3-CA3 synapses, we performed whole-cell patch-clamp recordings in acute hippocampal
    slices from rats (postnatal 21-24 days) at room temperature. Compound excitatory
    postsynaptic potentials (ESPSs) were recorded by tract stimulation in stratum
    oriens in the presence of 10 µM gabazine. High-frequency stimulation (HFS) induced
    N-methyl-D-aspartate (NMDA) receptor-dependent long-term potentiation (LTP). Although
    LTP by HFS did not requier postsynaptic spikes, it was blocked by Na+-channel
    blockers suggesting that local active processes (e.g.) dendritic spikes) may contribute
    to LTP induction without requirement of a somatic action potential (AP). We next
    examined the properties of spike timing-dependent plasticity (STDP) at CA3-CA3
    synapses. Unexpectedly, low-frequency pairing of EPSPs and backpropagated action
    potentialy (bAPs) induced LTP, independent of temporal order. The STDP curve was
    symmetric and broad, with a half-width of ~150 ms. Consistent with these specific
    STDP induction properties, post-presynaptic sequences led to a supralinear summation
    of spine [Ca2+] transients. Furthermore, in autoassociative network models, storage
    and recall was substantially more robust with symmetric than with asymmetric STDP
    rules. In conclusion, we found associative forms of LTP at CA3-CA3 recurrent collateral
    synapses with distinct induction rules. LTP induced by HFS may be associated with
    dendritic spikes. In contrast, low frequency pairing of pre- and postsynaptic
    activity induced LTP only if EPSP-AP were temporally very close. Together, these
    induction mechanisms of synaptiic plasticity may contribute to memory storage
    in the CA3-CA3 microcircuit at different ranges of activity.
alternative_title:
- ISTA Thesis
article_processing_charge: No
author:
- first_name: Rajiv Kumar
  full_name: Mishra, Rajiv Kumar
  id: 46CB58F2-F248-11E8-B48F-1D18A9856A87
  last_name: Mishra
citation:
  ama: Mishra RK. Synaptic plasticity rules at CA3-CA3 recurrent synapses in hippocampus.
    2016.
  apa: Mishra, R. K. (2016). <i>Synaptic plasticity rules at CA3-CA3 recurrent synapses
    in hippocampus</i>. Institute of Science and Technology Austria.
  chicago: Mishra, Rajiv Kumar. “Synaptic Plasticity Rules at CA3-CA3 Recurrent Synapses
    in Hippocampus.” Institute of Science and Technology Austria, 2016.
  ieee: R. K. Mishra, “Synaptic plasticity rules at CA3-CA3 recurrent synapses in
    hippocampus,” Institute of Science and Technology Austria, 2016.
  ista: Mishra RK. 2016. Synaptic plasticity rules at CA3-CA3 recurrent synapses in
    hippocampus. Institute of Science and Technology Austria.
  mla: Mishra, Rajiv Kumar. <i>Synaptic Plasticity Rules at CA3-CA3 Recurrent Synapses
    in Hippocampus</i>. Institute of Science and Technology Austria, 2016.
  short: R.K. Mishra, Synaptic Plasticity Rules at CA3-CA3 Recurrent Synapses in Hippocampus,
    Institute of Science and Technology Austria, 2016.
date_created: 2018-12-11T11:51:46Z
date_published: 2016-03-01T00:00:00Z
date_updated: 2023-09-07T11:55:26Z
day: '01'
ddc:
- '570'
degree_awarded: PhD
department:
- _id: PeJo
file:
- access_level: closed
  checksum: 5a010a838faf040f7064f3cfb802f743
  content_type: application/pdf
  creator: dernst
  date_created: 2019-08-09T12:14:46Z
  date_updated: 2020-07-14T12:44:48Z
  file_id: '6782'
  file_name: Thesis_Mishra_Rajiv (Final).pdf
  file_size: 2407572
  relation: main_file
- access_level: open_access
  checksum: 81b26d9ede92c99f1d8cc6fa1d04cbbb
  content_type: application/pdf
  creator: dernst
  date_created: 2021-02-22T11:48:44Z
  date_updated: 2021-02-22T11:48:44Z
  file_id: '9183'
  file_name: 2016_RajivMishra_Thesis.pdf
  file_size: 2407572
  relation: main_file
  success: 1
file_date_updated: 2021-02-22T11:48:44Z
has_accepted_license: '1'
language:
- iso: eng
month: '03'
oa: 1
oa_version: Published Version
page: '83'
publication_identifier:
  issn:
  - 2663-337X
publication_status: published
publisher: Institute of Science and Technology Austria
publist_id: '5811'
related_material:
  record:
  - id: '1432'
    relation: part_of_dissertation
    status: public
status: public
supervisor:
- first_name: Peter M
  full_name: Jonas, Peter M
  id: 353C1B58-F248-11E8-B48F-1D18A9856A87
  last_name: Jonas
  orcid: 0000-0001-5001-4804
title: Synaptic plasticity rules at CA3-CA3 recurrent synapses in hippocampus
type: dissertation
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
year: '2016'
...
---
_id: '2964'
abstract:
- lang: eng
  text: 'CA3 pyramidal neurons are important for memory formation and pattern completion
    in the hippocampal network. These neurons receive multiple excitatory inputs from
    numerous sources. Therefore, the rules of spatiotemporal integration of multiple
    synaptic inputs and propagation of action potentials are important to understand
    how CA3 neurons contribute to higher brain functions at cellular level. By using
    confocally targeted patch-clamp recording techniques, we investigated the biophysical
    properties of rat CA3 pyramidal neuron dendrites. We found two distinct dendritic
    domains critical for action potential initiation and propagation: In the proximal
    domain, action potentials initiated in the axon backpropagate actively with large
    amplitude and fast time course. In the distal domain, Na+-channel mediated dendritic
    spikes are efficiently evoked by local dendritic depolarization or waveforms mimicking
    synaptic events. These findings can be explained by a high Na+-to-K+ conductance
    density ratio of CA3 pyramidal neuron dendrites. The results challenge the prevailing
    view that proximal mossy fiber inputs activate CA3 pyramidal neurons more efficiently
    than distal perforant inputs by showing that the distal synapses trigger a different
    form of activity represented by dendritic spikes. The high probability of dendritic
    spike initiation in the distal area may enhance the computational power of CA3
    pyramidal neurons in the hippocampal network.  '
alternative_title:
- ISTA Thesis
article_processing_charge: No
author:
- first_name: Sooyun
  full_name: Kim, Sooyun
  id: 394AB1C8-F248-11E8-B48F-1D18A9856A87
  last_name: Kim
citation:
  ama: Kim S. Active properties of hippocampal CA3 pyramidal neuron dendrites. 2012.
  apa: Kim, S. (2012). <i>Active properties of hippocampal CA3 pyramidal neuron dendrites</i>.
    Institute of Science and Technology Austria.
  chicago: Kim, Sooyun. “Active Properties of Hippocampal CA3 Pyramidal Neuron Dendrites.”
    Institute of Science and Technology Austria, 2012.
  ieee: S. Kim, “Active properties of hippocampal CA3 pyramidal neuron dendrites,”
    Institute of Science and Technology Austria, 2012.
  ista: Kim S. 2012. Active properties of hippocampal CA3 pyramidal neuron dendrites.
    Institute of Science and Technology Austria.
  mla: Kim, Sooyun. <i>Active Properties of Hippocampal CA3 Pyramidal Neuron Dendrites</i>.
    Institute of Science and Technology Austria, 2012.
  short: S. Kim, Active Properties of Hippocampal CA3 Pyramidal Neuron Dendrites,
    Institute of Science and Technology Austria, 2012.
date_created: 2018-12-11T12:00:35Z
date_published: 2012-06-01T00:00:00Z
date_updated: 2023-09-07T11:43:51Z
day: '01'
degree_awarded: PhD
department:
- _id: PeJo
- _id: GradSch
language:
- iso: eng
month: '06'
oa_version: None
page: '65'
publication_identifier:
  issn:
  - 2663-337X
publication_status: published
publisher: Institute of Science and Technology Austria
publist_id: '3755'
related_material:
  record:
  - id: '3258'
    relation: part_of_dissertation
    status: public
status: public
supervisor:
- first_name: Peter M
  full_name: Jonas, Peter M
  id: 353C1B58-F248-11E8-B48F-1D18A9856A87
  last_name: Jonas
  orcid: 0000-0001-5001-4804
title: Active properties of hippocampal CA3 pyramidal neuron dendrites
type: dissertation
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
year: '2012'
...
