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Elife. 2016 Apr 2;5:e13343. doi: 10.7554/eLife.13343.

Structural development and dorsoventral maturation of the medial entorhinal cortex.

Author information

1
Bernstein Center for Computational Neuroscience, Humboldt University of Berlin, Berlin, Germany.

Abstract

We investigated the structural development of superficial-layers of medial entorhinal cortex and parasubiculum in rats. The grid-layout and cholinergic-innervation of calbindin-positive pyramidal-cells in layer-2 emerged around birth while reelin-positive stellate-cells were scattered throughout development. Layer-3 and parasubiculum neurons had a transient calbindin-expression, which declined with age. Early postnatally, layer-2 pyramidal but not stellate-cells co-localized with doublecortin - a marker of immature neurons - suggesting delayed functional-maturation of pyramidal-cells. Three observations indicated a dorsal-to-ventral maturation of entorhinal cortex and parasubiculum: (i) calbindin-expression in layer-3 neurons decreased progressively from dorsal-to-ventral, (ii) doublecortin in layer-2 calbindin-positive-patches disappeared dorsally before ventrally, and (iii) wolframin-expression emerged earlier in dorsal than ventral parasubiculum. The early appearance of calbindin-pyramidal-grid-organization in layer-2 suggests that this pattern is instructed by genetic information rather than experience. Superficial-layer-microcircuits mature earlier in dorsal entorhinal cortex, where small spatial-scales are represented. Maturation of ventral-entorhinal-microcircuits - representing larger spatial-scales - follows later around the onset of exploratory behavior.

KEYWORDS:

calbindin patches; doublecortin; immature neurons; medial entorhinal cortex; neuroscience; parasubiculum; pyramidal neurons; rat

PMID:
27036175
PMCID:
PMC4876644
DOI:
10.7554/eLife.13343
[Indexed for MEDLINE]
Free PMC Article

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