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The Journal of Neuroscience, October 1, 2002, 22(19):8541-8552
Refinement of Thalamocortical Arbors and Emergence of Barrel
Domains in the Primary Somatosensory Cortex: A Study of Normal and
Monoamine Oxidase A Knock-Out Mice
Alexandra
Rebsam1,
Isabelle
Seif2, and
Patricia
Gaspar1
1 Institut National de la Santé et de la
Recherche Médicale U106, Hopital
Pitié-Salpêtrière, 75013 Paris, France, and
2 Faculté de pharmacie, Université Paris Sud,
92296 Châtenay Malabry, France
In the rodent primary somatosensory cortex, the thalamocortical
axons (TCAs) are organized into clusters that correspond to functional
units in the periphery. Around these axons, neurons in layer IV
aggregate as barrels. To understand how this organization emerges, we
analyzed TCA development in mice that do not form barrels, the
monoamine oxidase A knock-out (MAOA-KO), and in MAOA/5-HT1B receptor double-KO mice, which have a restored barrel field. We show that TCAs already attain cortical layer IV on the day of birth.
They are uniformly distributed in this layer from postnatal day 0 (P0)
to P2 and secondarily coalesce into barrel domains in layer IV, over a
3 d period (P3-P5), with no prepatterning in the deeper layers.
In MAOA-KO mice, the uniform distribution of the TC projection is
maintained, and no axon clusters emerge. Individual TCA arbors were
traced after carbocyanine injections. At P1, TCAs were poorly branched
and covered variable tangential widths, encompassing one to two
prospective barrels. At P7 the number of TCA branches increased 10-fold
in layer IV and became restricted to one barrel. In MAOA-KO mice, there
was a 50% reduction of the TCA terminal branches in layer IV, with a
40% increase in their tangential extent. These defects were corrected
in the MAOA/5-HT1B double knock-out mice, indicating an
effect of the presynaptic 5-HT1B receptor on axon
branching. Our results indicate that the barrel-deficient phenotype of
MAOA-KO mice results from an altered refinement of the TCA arbors in
their target layer IV, involving branch elaboration and collateral
retraction during early postnatal life.
Key words:
serotonin; activity-dependent mechanisms; synaptic
stabilization; axon growth; axon branch formation; collateral
retraction
Copyright © 2002 Society for Neuroscience 0270-6474/02/22198541-12$05.00/0
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