---
_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). Synaptic plasticity rules at CA3-CA3 recurrent synapses
in hippocampus. 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. Synaptic Plasticity Rules at CA3-CA3 Recurrent Synapses
in Hippocampus. 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:
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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
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checksum: 81b26d9ede92c99f1d8cc6fa1d04cbbb
content_type: application/pdf
creator: dernst
date_created: 2021-02-22T11:48:44Z
date_updated: 2021-02-22T11:48:44Z
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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'
...