---
_id: '2616'
abstract:
- lang: eng
text: Neurons in the rat cerebral cortex are enriched in group I metabotropic glutamate
receptor (mGluR) subtypes and respond to their activation during development.
To understand better the mechanisms by which mGluR1 and mGluR5 mediate these effects,
the goal of this study was to elucidate the expression pattern and to determine
the cellular and the precise subcellular localization of these two receptor subtypes
in the rat neocortex and hippocampus during late prenatal and postnatal development.
At the light microscopic level, mGluR1 α and mGluR5 were first detected in the
cerebral cortex with different expression levels at embryonic day E18. Thus, mGluR5
had a moderate expression, whereas mGluR1 α was detected as a diffuse and weak
labeling. mGluR5 was localized in some Cajal-Retzius cells as well as in other
cell types, such as pioneer neurons of the marginal zone. During postnatal development,
the distribution of the receptors dramatically changed. From P0 to around P10,
mGluR1α was localized in identified, transient Cajal-Retzius cells of neocortex
and hippocampus, until these cells disappear. In addition, a population of interneurons
localized the receptor from the second/third postnatal week. In contrast, mGluR5
was localized mainly in pyramidal cells and in some interneurons, with a neuropilar
staining throughout the cerebral cortex. At the electron microscopic level, the
immunoreactivity for both group I mGluR subtypes was expressed postsynaptically.
Using immunogold methods, mGluR1α and mGluR5 immunoreactivities were found throughout
postnatal development at the edge of postsynaptic specialization of asymmetrical
synapses. These results show that the two group I mGluRs have a differential expression
pattern in neocortex and hippocampus that may suggest roles for the receptors
in the early processing of cortical information and in the control of cortical
developmental events.
acknowledgement: The authors are grateful to Dr Ole Paulsen and Professor Kay Davies
for their comments on the manuscript. We also would like to thank Dr Zoltan Molnar
for his support and Mrs Lucy Jones, Ms Courtney Voelker and Mr David Dongworth for
the English revision of the manuscript. This work was supported by grants from the
European Community (QLG3-CT-1999-00192 to R.L.) and the Spanish Ministerio de Ciencia
y Tecnología (PB97-0582-CO2-01 to A.F.).
article_processing_charge: No
article_type: original
author:
- first_name: Guillermina
full_name: López Bendito, Guillermina
last_name: López Bendito
- first_name: Ryuichi
full_name: Shigemoto, Ryuichi
id: 499F3ABC-F248-11E8-B48F-1D18A9856A87
last_name: Shigemoto
orcid: 0000-0001-8761-9444
- first_name: Alfonso
full_name: Fairén, Alfonso
last_name: Fairén
- first_name: Rafael
full_name: Luján, Rafael
last_name: Luján
citation:
ama: López Bendito G, Shigemoto R, Fairén A, Luján R. Differential distribution
of group I metabotropic glutamate receptors during rat cortical development. Cerebral
Cortex. 2002;12(6):625-638. doi:10.1093/cercor/12.6.625
apa: López Bendito, G., Shigemoto, R., Fairén, A., & Luján, R. (2002). Differential
distribution of group I metabotropic glutamate receptors during rat cortical development.
Cerebral Cortex. Oxford University Press. https://doi.org/10.1093/cercor/12.6.625
chicago: López Bendito, Guillermina, Ryuichi Shigemoto, Alfonso Fairén, and Rafael
Luján. “Differential Distribution of Group I Metabotropic Glutamate Receptors
during Rat Cortical Development.” Cerebral Cortex. Oxford University Press,
2002. https://doi.org/10.1093/cercor/12.6.625.
ieee: G. López Bendito, R. Shigemoto, A. Fairén, and R. Luján, “Differential distribution
of group I metabotropic glutamate receptors during rat cortical development,”
Cerebral Cortex, vol. 12, no. 6. Oxford University Press, pp. 625–638,
2002.
ista: López Bendito G, Shigemoto R, Fairén A, Luján R. 2002. Differential distribution
of group I metabotropic glutamate receptors during rat cortical development. Cerebral
Cortex. 12(6), 625–638.
mla: López Bendito, Guillermina, et al. “Differential Distribution of Group I Metabotropic
Glutamate Receptors during Rat Cortical Development.” Cerebral Cortex,
vol. 12, no. 6, Oxford University Press, 2002, pp. 625–38, doi:10.1093/cercor/12.6.625.
short: G. López Bendito, R. Shigemoto, A. Fairén, R. Luján, Cerebral Cortex 12 (2002)
625–638.
date_created: 2018-12-11T11:58:41Z
date_published: 2002-06-01T00:00:00Z
date_updated: 2023-07-25T09:54:10Z
day: '01'
doi: 10.1093/cercor/12.6.625
extern: '1'
external_id:
pmid:
- '12003862'
intvolume: ' 12'
issue: '6'
language:
- iso: eng
month: '06'
oa_version: None
page: 625 - 638
pmid: 1
publication: Cerebral Cortex
publication_identifier:
issn:
- 1047-3211
publication_status: published
publisher: Oxford University Press
publist_id: '4282'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Differential distribution of group I metabotropic glutamate receptors during
rat cortical development
type: journal_article
user_id: ea97e931-d5af-11eb-85d4-e6957dddbf17
volume: 12
year: '2002'
...
---
_id: '2619'
abstract:
- lang: eng
text: The release of glutamate and GABA is modulated by presynaptic metabotropic
glutamate receptors (mGluRs). We used immunocytochemical methods to define the
location of the group III receptor mGluR7a in glutamatergic and GABAergic terminals
innervating GABAergic interneurons and pyramidal cells. Immunoreactivity for mGluR7a
was localized in the presynaptic active zone of both identified GABAergic and
presumed glutamatergic terminals. Terminals innervating dendritic spines showed
a variable level of receptor immunoreactivity, ranging from immunonegative to
strongly immunopositive. The frequency of strongly mGluR7a positive terminals
innervating the soma and dendrites of mGluR1α/somatostatin-expressing interneurons
was very high relative to other neurons. On dendrites that received mGluR7a-enriched
glutamatergic innervation, at least 80% of GABAergic terminals were immunopositive
for mGluR7a. On such dendrites virtually all (95%) vasoactive intestinal polypeptide
(VIP) positive (GABAergic) terminals were enriched in mGluR7a. The targets of
VIP/mGluR7a-expressing terminals were mainly (88%) mGluR1α-expressing interneurons,
which were mostly somatostatin immunopositive. Parvalbumin positive terminals
were immunonegative for mGluR7a. Some parvalbumin immunoreactive dendrites received
strongly mGluR7a positive terminals. The subcellular location, as well as the
cell type and synapse-specific distribution of mGluR7a in isocortical neuronal
circuits, is homologous to its distribution in the hippocampus. The specific location
of mGluR7a in the presynaptic active zone of both glutamatergic and GABAergic
synapses may be related to the proximity of calcium channels and the vesicle fusion
machinery. The enrichment of mGluR7a in the main GABAergic, as well as in the
glutamatergic, innervation of mGluR1α/somatostatin-expressing interneurons suggests
that their activation is under unique regulation by extracellular glutamate.
acknowledgement: We thank Dr C. Paspalas for an initial contribution to the immunocytochemistry.
We are grateful for the generous gifts of antibodies from Dr A. Buchan (anti-somatostatin,
Department of Physiology, University of British Columbia, Canada), Dr M. Watanabe
(anti-mGluR1α, Department of Anatomy, Hokkaido University School of Medicine, Sapporo)
and Dr K. Tanaka (anti-GAD, Niigata University, Faculty of Medicine, Department
of Neurology). We thank Dr F. Ferraguti for helpful suggestions during the project
and for his comments on a previous version of the manuscript. We also thank Philip
Cobden, Paul Jays and Laszlo Marton for assistance. Y.D. was supported by a Wellcome
Trust Advanced Training Fellowship.
article_processing_charge: No
article_type: original
author:
- first_name: Yannis
full_name: Dalezios, Yannis
last_name: Dalezios
- first_name: Rafael
full_name: Luján, Rafael
last_name: Luján
- first_name: Ryuichi
full_name: Shigemoto, Ryuichi
id: 499F3ABC-F248-11E8-B48F-1D18A9856A87
last_name: Shigemoto
orcid: 0000-0001-8761-9444
- first_name: John
full_name: Roberts, John
last_name: Roberts
- first_name: Péter
full_name: Somogyi, Péter
last_name: Somogyi
citation:
ama: Dalezios Y, Luján R, Shigemoto R, Roberts J, Somogyi P. Enrichment of mGluR7a
in the Presynaptic active zones of GABAergic and Non-GABAergic terminals on interneurons
in the rat somatosensory cortex. Cerebral Cortex. 2002;12(9):961-974. doi:10.1093/cercor/12.9.961
apa: Dalezios, Y., Luján, R., Shigemoto, R., Roberts, J., & Somogyi, P. (2002).
Enrichment of mGluR7a in the Presynaptic active zones of GABAergic and Non-GABAergic
terminals on interneurons in the rat somatosensory cortex. Cerebral Cortex.
Oxford University Press. https://doi.org/10.1093/cercor/12.9.961
chicago: Dalezios, Yannis, Rafael Luján, Ryuichi Shigemoto, John Roberts, and Péter
Somogyi. “Enrichment of MGluR7a in the Presynaptic Active Zones of GABAergic and
Non-GABAergic Terminals on Interneurons in the Rat Somatosensory Cortex.” Cerebral
Cortex. Oxford University Press, 2002. https://doi.org/10.1093/cercor/12.9.961.
ieee: Y. Dalezios, R. Luján, R. Shigemoto, J. Roberts, and P. Somogyi, “Enrichment
of mGluR7a in the Presynaptic active zones of GABAergic and Non-GABAergic terminals
on interneurons in the rat somatosensory cortex,” Cerebral Cortex, vol.
12, no. 9. Oxford University Press, pp. 961–974, 2002.
ista: Dalezios Y, Luján R, Shigemoto R, Roberts J, Somogyi P. 2002. Enrichment of
mGluR7a in the Presynaptic active zones of GABAergic and Non-GABAergic terminals
on interneurons in the rat somatosensory cortex. Cerebral Cortex. 12(9), 961–974.
mla: Dalezios, Yannis, et al. “Enrichment of MGluR7a in the Presynaptic Active Zones
of GABAergic and Non-GABAergic Terminals on Interneurons in the Rat Somatosensory
Cortex.” Cerebral Cortex, vol. 12, no. 9, Oxford University Press, 2002,
pp. 961–74, doi:10.1093/cercor/12.9.961.
short: Y. Dalezios, R. Luján, R. Shigemoto, J. Roberts, P. Somogyi, Cerebral Cortex
12 (2002) 961–974.
date_created: 2018-12-11T11:58:42Z
date_published: 2002-09-01T00:00:00Z
date_updated: 2023-07-25T09:40:49Z
day: '01'
doi: 10.1093/cercor/12.9.961
extern: '1'
external_id:
pmid:
- '12183395'
intvolume: ' 12'
issue: '9'
language:
- iso: eng
month: '09'
oa_version: None
page: 961 - 974
pmid: 1
publication: Cerebral Cortex
publication_identifier:
issn:
- 1047-3211
publication_status: published
publisher: Oxford University Press
publist_id: '4280'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Enrichment of mGluR7a in the Presynaptic active zones of GABAergic and Non-GABAergic
terminals on interneurons in the rat somatosensory cortex
type: journal_article
user_id: ea97e931-d5af-11eb-85d4-e6957dddbf17
volume: 12
year: '2002'
...
---
_id: '3533'
abstract:
- lang: eng
text: 'Information in neuronal networks is thought to be represented by the rate
of discharge and the temporal relationship between the discharging neurons. The
discharge frequency of neurons is affected by their afferents and intrinsic properties,
and shows great individual variability. The temporal coordination of neurons is
greatly facilitated by network oscillations. In the hippocampus, population synchrony
fluctuates during theta and gamma oscillations (10-100 ms scale) and can increase
almost 10-fold during sharp wave bursts. Despite these large changes in excitability
in the sub-second scale, longer-term (minute-scale) firing rates of individual
neurons are relatively constant in an unchanging environment. As a result, mean
hippocampal output remains stable over time. To understand the mechanisms responsible
for this homeostasis, we address the following issues: (i) Can firing rates of
single cells be modified? (ii) Once modified, what mechanism(s) can maintain the
changes? We show that firing rates of hippocampal pyramidal cells can be altered
in a novel environment and by Hebbian pairing of physiological input patterns
with postsynaptic burst discharge. We also illustrate a competition between single
spikes and the occurrence of spike bursts. Since spike-inducing (suprathreshold)
inputs decrease the ability of strong (''teaching'') inputs to induce a burst
discharge, we propose that the single spike versus burst competition presents
a homeostatic regulatory mechanism to maintain synaptic strength and, consequently,
firing rate in pyramidal cells.'
article_processing_charge: No
article_type: original
author:
- first_name: György
full_name: Buzsáki, György
last_name: Buzsáki
- first_name: Jozsef L
full_name: Csicsvari, Jozsef L
id: 3FA14672-F248-11E8-B48F-1D18A9856A87
last_name: Csicsvari
orcid: 0000-0002-5193-4036
- first_name: George
full_name: Dragoi, George
last_name: Dragoi
- first_name: Kenneth
full_name: Harris, Kenneth
last_name: Harris
- first_name: D.
full_name: Henze, D.
last_name: Henze
- first_name: Hajima
full_name: Hirase, Hajima
last_name: Hirase
citation:
ama: Buzsáki G, Csicsvari JL, Dragoi G, Harris K, Henze D, Hirase H. Homeostatic
maintenance of neuronal excitability by burst discharges in vivo. Cerebral
Cortex. 2002;12(9):893-899. doi:10.1093/cercor/12.9.893
apa: Buzsáki, G., Csicsvari, J. L., Dragoi, G., Harris, K., Henze, D., & Hirase,
H. (2002). Homeostatic maintenance of neuronal excitability by burst discharges
in vivo. Cerebral Cortex. Oxford University Press. https://doi.org/10.1093/cercor/12.9.893
chicago: Buzsáki, György, Jozsef L Csicsvari, George Dragoi, Kenneth Harris, D.
Henze, and Hajima Hirase. “Homeostatic Maintenance of Neuronal Excitability by
Burst Discharges in Vivo.” Cerebral Cortex. Oxford University Press, 2002.
https://doi.org/10.1093/cercor/12.9.893.
ieee: G. Buzsáki, J. L. Csicsvari, G. Dragoi, K. Harris, D. Henze, and H. Hirase,
“Homeostatic maintenance of neuronal excitability by burst discharges in vivo,”
Cerebral Cortex, vol. 12, no. 9. Oxford University Press, pp. 893–899,
2002.
ista: Buzsáki G, Csicsvari JL, Dragoi G, Harris K, Henze D, Hirase H. 2002. Homeostatic
maintenance of neuronal excitability by burst discharges in vivo. Cerebral Cortex.
12(9), 893–899.
mla: Buzsáki, György, et al. “Homeostatic Maintenance of Neuronal Excitability by
Burst Discharges in Vivo.” Cerebral Cortex, vol. 12, no. 9, Oxford University
Press, 2002, pp. 893–99, doi:10.1093/cercor/12.9.893.
short: G. Buzsáki, J.L. Csicsvari, G. Dragoi, K. Harris, D. Henze, H. Hirase, Cerebral
Cortex 12 (2002) 893–899.
date_created: 2018-12-11T12:03:50Z
date_published: 2002-09-01T00:00:00Z
date_updated: 2023-07-17T07:27:12Z
day: '01'
doi: 10.1093/cercor/12.9.893
extern: '1'
external_id:
pmid:
- '12183388'
intvolume: ' 12'
issue: '9'
language:
- iso: eng
month: '09'
oa_version: None
page: 893 - 899
pmid: 1
publication: Cerebral Cortex
publication_identifier:
issn:
- 1047-3211
publication_status: published
publisher: Oxford University Press
publist_id: '2851'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Homeostatic maintenance of neuronal excitability by burst discharges in vivo
type: journal_article
user_id: ea97e931-d5af-11eb-85d4-e6957dddbf17
volume: 12
year: '2002'
...