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The Journal of Neuroscience, September 1, 2001, 21(17):6862-6873
Barrel Pattern Formation Requires Serotonin Uptake by
Thalamocortical Afferents, and Not Vesicular Monoamine Release
Antonio M.
Persico1,
Elisa
Mengual2,
Rainald
Moessner3,
Scott F.
Hall4,
Randal S.
Revay4,
Ichiro
Sora4,
Jon
Arellano5,
Javier
DeFelipe5,
José Manuel
Giménez-Amaya2,
Monica
Conciatori1,
Ramona
Marino1,
Alfonso
Baldi1,
Simona
Cabib6,
Tiziana
Pascucci6,
George R.
Uhl4,
Dennis L.
Murphy7,
K. Peter
Lesch3, and
Flavio
Keller1
1 Laboratory of Neuroscience, Università
"Campus Bio-Medico," 00155 Rome, Italy, 2 Departamento
de Anatomia, Facultad de Medicina, Universidad de Navarra, 31008 Pamplona, Spain, 3 Department of Psychiatry, University of
Wuerzburg, 97080 Wuerzburg, Germany, 4 Molecular
Neurobiology Branch, Intramural Research Program/National
Institute on Drug Abuse/National Institutes of Health, Baltimore,
Maryland 21224, 5 Instituto Cajal, Consejo Superior de
Investigación Cientifica, 28029 Madrid, Spain,
6 Department of Psychology, Università "La
Sapienza," 00185 Rome, Italy, and 7 Laboratory of
Clinical Science, National Institute of Mental Health/National
Institutes of Health, Bethesda, Maryland 20892
Thalamocortical neurons innervating the barrel cortex in neonatal
rodents transiently store serotonin (5-HT) in synaptic vesicles by
expressing the plasma membrane serotonin transporter (5-HTT) and the
vesicular monoamine transporter (VMAT2). 5-HTT knock-out (ko) mice
reveal a nearly complete absence of 5-HT in the cerebral cortex by
immunohistochemistry, and of barrels, both at P7 and adulthood.
Quantitative electron microscopy reveals that 5-HTT ko affects neither
the density of synapses nor the length of synaptic contacts in layer
IV. VMAT2 ko mice, completely lacking activity-dependent vesicular
release of monoamines including 5-HT, also show a complete lack of 5-HT
in the cortex but display largely normal barrel fields, despite
sometimes markedly reduced postnatal growth. Transient 5-HTT expression
is thus required for barrel pattern formation, whereas
activity-dependent vesicular 5-HT release is not.
Key words:
barrel; homologous recombination; knock-out; monoamine; p-chlorophenylalanine; serotonin; serotonin transporter; vesicular monoamine transporter; GABA transporter; whisker
Copyright © 2001 Society for Neuroscience 0270-6474/01/21176862-12$05.00/0
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