2024-03-28T11:23:50Z
https://u-ryukyu.repo.nii.ac.jp/oai
oai:u-ryukyu.repo.nii.ac.jp:02012562
2023-08-03T05:25:14Z
1642838163960:1642838338003
1642838403551:1642838407795
Distinct development of GABA system in the ventral and dorsal horns in the embryonic mouse spinal cord
Kosaka, Yoshinori
Kin, Hidemichi
Tatetsu, Masaharu
Uema, Itsuki
Takayama, Chitoshi
open access
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0
https://creativecommons.org/licenses/by-nc-nd/4.0/
cervical cord
GABAergic synapse
glutamic acid decarboxylase (GAD)
potassium chloride co-transporter 2 (KCC2)
vesicular GABA transporter (VGAT)
In the adult brain, gamma-amino butyric acid (GABA) is an inhibitory neurotransmitter, whereas it acts as an excitatory transmitter in the immature brain, and may be involved in morphogenesis. In the present study, we immunohistochemically examined the developmental changes in GABA signaling in the embryonic mouse cervical spinal cord. Glutamic acid decarboxylase and GABA were markers for GABA neurons. Vesicular GABA transporter was a marker for GABAergic and glycinergic terminals. Potassium chloride cotransporter 2 was a marker for GABAergic inhibition. We found five points: (1) In the ventral part, GABA neurons were divided into three groups. The first differentiated group sent commissural axons after embryonic day 11 (Ell), but disappeared or changed their transmitter by E15. The second and third differentiated groups were localized in the ventral horn after E12, and sent axons to the ipsilateral marginal zone. There was a distal-to-proximal gradient in varicosity formation in GABAergic axons and a superficial-to-deep gradient in GABAergic synapse formation in the ventral horn; (2) In the dorsal horn, GABA neurons were localized after E13, and synapses were diffusely formed after E15; (3) GABA may be excitatory for several days before synapses formation; (4) There was a ventral-to-dorsal gradient in the development of GABA signaling. The GABAergic inhibitory network may develop in the ventral horn between E15 and E17, and GABA may transiently play crucial roles in inhibitory regulation of the motor system in the mouse fetus; (5) GABA signaling continued to develop after birth, and GABAergic system diminished in the ventral horn.
論文
Elsevier
2012-11-27
eng
journal article
AM
http://hdl.handle.net/20.500.12000/46545
http://hdl.handle.net/20.500.12000/46545
https://u-ryukyu.repo.nii.ac.jp/records/2012562
https://doi.org/10.1016/j.brainres.2012.10.003
https://doi.org/10.1016/j.brainres.2012.10.003
0006-8993
Brain Research
1486
27
39
52
https://u-ryukyu.repo.nii.ac.jp/record/2012562/files/Figure 9.tif
https://u-ryukyu.repo.nii.ac.jp/record/2012562/files/Figure 8.tif
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https://u-ryukyu.repo.nii.ac.jp/record/2012562/files/Figure 3.tif
https://u-ryukyu.repo.nii.ac.jp/record/2012562/files/Figure 2.tif
https://u-ryukyu.repo.nii.ac.jp/record/2012562/files/Figure 1.tif
https://u-ryukyu.repo.nii.ac.jp/record/2012562/files/1486.27.pdf