ERK is involved in the reorganization of somatosensory cortical maps in adult rats submitted to hindlimb unloading.
Sensorimotor restriction by a 14-day period of hindlimb unloading (HU) in the adult rat induces a reorganization of topographic maps and receptive fields. However, the underlying mechanisms are still unclear. Interest was turned towards a possible implication of intracellular MAPK signaling pathway...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2011-03-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC3050880?pdf=render |
| _version_ | 1817969393875812352 |
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| author | Erwan Dupont Laurence Stevens Laetitia Cochon Maurice Falempin Bruno Bastide Marie-Hélène Canu |
| author_facet | Erwan Dupont Laurence Stevens Laetitia Cochon Maurice Falempin Bruno Bastide Marie-Hélène Canu |
| author_sort | Erwan Dupont |
| collection | DOAJ |
| description | Sensorimotor restriction by a 14-day period of hindlimb unloading (HU) in the adult rat induces a reorganization of topographic maps and receptive fields. However, the underlying mechanisms are still unclear. Interest was turned towards a possible implication of intracellular MAPK signaling pathway since Extracellular-signal-Regulated Kinase 1/2 (ERK1/2) is known to play a significant role in the control of synaptic plasticity. In order to better understand the mechanisms underlying cortical plasticity in adult rats submitted to a sensorimotor restriction, we analyzed the time-course of ERK1/2 activation by immunoblot and of cortical reorganization by electrophysiological recordings, on rats submitted to hindlimb unloading over four weeks. Immunohistochemistry analysis provided evidence that ERK1/2 phosphorylation was increased in layer III neurons of the somatosensory cortex. This increase was transient, and parallel to the changes in hindpaw cortical map area (layer IV). By contrast, receptive fields were progressively enlarged from 7 to 28 days of hindlimb unloading. To determine whether ERK1/2 was involved in cortical remapping, we administered a specific ERK1/2 inhibitor (PD-98059) through osmotic mini-pump in rats hindlimb unloaded for 14 days. Results demonstrate that focal inhibition of ERK1/2 pathway prevents cortical reorganization, but had no effect on receptive fields. These results suggest that ERK1/2 plays a role in the induction of cortical plasticity during hindlimb unloading. |
| first_indexed | 2024-04-13T20:21:36Z |
| format | Article |
| id | doaj.art-05a6d1ea4ecc49258039274319368836 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-04-13T20:21:36Z |
| publishDate | 2011-03-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-05a6d1ea4ecc492580392743193688362022-12-22T02:31:32ZengPublic Library of Science (PLoS)PLoS ONE1932-62032011-03-0163e1756410.1371/journal.pone.0017564ERK is involved in the reorganization of somatosensory cortical maps in adult rats submitted to hindlimb unloading.Erwan DupontLaurence StevensLaetitia CochonMaurice FalempinBruno BastideMarie-Hélène CanuSensorimotor restriction by a 14-day period of hindlimb unloading (HU) in the adult rat induces a reorganization of topographic maps and receptive fields. However, the underlying mechanisms are still unclear. Interest was turned towards a possible implication of intracellular MAPK signaling pathway since Extracellular-signal-Regulated Kinase 1/2 (ERK1/2) is known to play a significant role in the control of synaptic plasticity. In order to better understand the mechanisms underlying cortical plasticity in adult rats submitted to a sensorimotor restriction, we analyzed the time-course of ERK1/2 activation by immunoblot and of cortical reorganization by electrophysiological recordings, on rats submitted to hindlimb unloading over four weeks. Immunohistochemistry analysis provided evidence that ERK1/2 phosphorylation was increased in layer III neurons of the somatosensory cortex. This increase was transient, and parallel to the changes in hindpaw cortical map area (layer IV). By contrast, receptive fields were progressively enlarged from 7 to 28 days of hindlimb unloading. To determine whether ERK1/2 was involved in cortical remapping, we administered a specific ERK1/2 inhibitor (PD-98059) through osmotic mini-pump in rats hindlimb unloaded for 14 days. Results demonstrate that focal inhibition of ERK1/2 pathway prevents cortical reorganization, but had no effect on receptive fields. These results suggest that ERK1/2 plays a role in the induction of cortical plasticity during hindlimb unloading.http://europepmc.org/articles/PMC3050880?pdf=render |
| spellingShingle | Erwan Dupont Laurence Stevens Laetitia Cochon Maurice Falempin Bruno Bastide Marie-Hélène Canu ERK is involved in the reorganization of somatosensory cortical maps in adult rats submitted to hindlimb unloading. PLoS ONE |
| title | ERK is involved in the reorganization of somatosensory cortical maps in adult rats submitted to hindlimb unloading. |
| title_full | ERK is involved in the reorganization of somatosensory cortical maps in adult rats submitted to hindlimb unloading. |
| title_fullStr | ERK is involved in the reorganization of somatosensory cortical maps in adult rats submitted to hindlimb unloading. |
| title_full_unstemmed | ERK is involved in the reorganization of somatosensory cortical maps in adult rats submitted to hindlimb unloading. |
| title_short | ERK is involved in the reorganization of somatosensory cortical maps in adult rats submitted to hindlimb unloading. |
| title_sort | erk is involved in the reorganization of somatosensory cortical maps in adult rats submitted to hindlimb unloading |
| url | http://europepmc.org/articles/PMC3050880?pdf=render |
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