Corridors of migrating neurons in the human brain and their decline during infancy

Document Type

Article

Abstract

The subventricular zone of many adult non-human mammals generates large numbers of new neurons destined for the olfactory bulb. Along the walls of the lateral ventricles, immature neuronal progeny migrate in tangentially oriented chains that coalesce into a rostral migratory stream (RMS) connecting the subventricular zone to the olfactory bulb. The adult human subventricular zone, in contrast, contains a hypocellular gap layer separating the ependymal lining from a periventricular ribbon of astrocytes. Some of these subventricular zone astrocytes can function as neural stem cells in vitro, but their function in vivo remains controversial. An initial report found few subventricular zone proliferating cells and rare migrating immature neurons in the RMS of adult humans. In contrast, a subsequent study indicated robust proliferation and migration in the human subventricular zone and RMS. Here we find that the infant human subventricular zone and RMS contain an extensive corridor of migrating immature neurons before 18 months of age but, contrary to previous reports, this germinal activity subsides in older children and is nearly extinct by adulthood. Surprisingly, during this limited window of neurogenesis, not all new neurons in the human subventricular zone are destined for the olfactory bulb--we describe a major migratory pathway that targets the prefrontal cortex in humans. Together, these findings reveal robust streams of tangentially migrating immature neurons in human early postnatal subventricular zone and cortex. These pathways represent potential targets of neurological injuries affecting neonates.

Medical Subject Headings

Adolescent; Adult; Aged; Aged, 80 and over; Brain (cytology, growth & development); Cell Movement; Cell Proliferation; Child; Child, Preschool; Humans; Infant; Infant, Newborn; Middle Aged; Neurons (cytology); Olfactory Pathways (cytology)

Publication Date

9-28-2011

Publication Title

Nature

E-ISSN

1476-4687

Volume

478

Issue

7369

First Page

382

Last Page

6

PubMed ID

21964341

Digital Object Identifier (DOI)

10.1038/nature10487

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