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  Synaptic and vesicular co-localization of the glutamate transporters VGLUT1 and VGLUT2 in the mouse hippocampus

Herzog, E., Takamori, S., Jahn, R., Brose, N., & Wojcik, S. M. (2006). Synaptic and vesicular co-localization of the glutamate transporters VGLUT1 and VGLUT2 in the mouse hippocampus. Journal of Neurochemistry, 99(3), 1011-1018. doi:10.1111/j.1471-4159.2006.04144.x.

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Herzog, Etienne1, Author           
Takamori, Shigeo, Author
Jahn, Reinhard, Author
Brose, Nils1, Author           
Wojcik, Sonja M.1, Author           
Affiliations:
1Molecular neurobiology, Max Planck Institute of Experimental Medicine, Max Planck Society, ou_2173659              

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Free keywords: excitatory terminals; postnatal development; quantal size; synaptic vesicles; vesicular glutamate transporter LONG-TERM DEPRESSION; RAT HIPPOCAMPUS; INHIBITORY SYNAPSES; QUANTAL SIZE; EXPRESSION; RELEASE; ASTROCYTES; VESICLES; NEURONS; DEFINES
 Abstract: Vesicular glutamate transporters (VGLUTs) are essential to glutamatergic synapses and determine the glutamatergic phenotype of neurones. The three known VGLUT isoforms display nearly identical uptake characteristics, but the associated expression domains in the adult rodent brain are largely segregated. Indeed, indirect evidence obtained in young VGLUT1-deficient mice indicated that in cells that co-express VGLUT1 and VGLUT2, the transporters may be targeted to different synaptic vesicles, which may populate different types of synapses formed by the same neurone. Direct evidence for a systematic segregation of VGLUT1 and VGLUT2 to distinct synapses and vesicles is lacking, and the mechanisms that may convey this segregation are not known. We show here that VGLUT1 and VGLUT2 are co-localized in many layers of the young hippocampus. Strikingly, VGLUT2 co-localizes with VGLUT1 in the mossy fibers at early stages. Furthermore, we show that a fraction of VGLUT1 and VGLUT2 is carried by the same vesicles at these stages. Hence, hippocampal neurones co-expressing VGLUT1 and VGLUT2 do not appear to sort them to separate vesicle pools. As the number of transporter molecules per vesicle affects quantal size, the developmental window where VGLUT1 and VGLUT2 are co-expressed may allow for greater plasticity in the control of quantal release.

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Language(s): eng - English
 Dates: 2006-11
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 292144
ISI: 000241345100030
ISI: 000241345100030
DOI: 10.1111/j.1471-4159.2006.04144.x
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Title: Journal of Neurochemistry
  Alternative Title : J. Neurochem.
Source Genre: Journal
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Pages: - Volume / Issue: 99 (3) Sequence Number: - Start / End Page: 1011 - 1018 Identifier: ISSN: 0022-3042