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Journal of Neuroscience, Vol 16, 2027-2033, Copyright © 1996 by Society for Neuroscience
Neurogenesis in the dentate gyrus of the adult rat: age-related decrease of neuronal progenitor proliferation
HG Kuhn, H Dickinson-Anson and FH Gage
Laboratory of Genetics, Salk Institute, La Jolla, California 92037, USA.
The hippocampus is one of the few areas of the rodent brain that continues
to produce neurons postnatally. Neurogenesis reportedly persists in rats up
to 11 months of age. Using bromodeoxyuridine (BrdU) labeling, the present
study confirms that in the adult rat brain, neuronal progenitor cells
divide at the border between the hilus and the granule cell layer (GCL). In
adult rats, the progeny of these cells migrate into the GCL and express the
neuronal markers NeuN and calbindin-D28k. However, neurogenesis was
drastically reduced in aged rats. Six-to 27-month-old Fischer rats were
injected intraperitoneally with BrdU to detect newborn cells in vivo and to
follow their fate in the dentate gyrus. When killed 4-6 weeks after BrdU
labeling, 12- to 27- month-old rats exhibited a significant decline in the
density of BrdU- positive cells in the granule cell layer compared with
6-month-old controls. Decreased neurogenesis in aging rats was accompanied
by reduced immunoreactivity for poly-sialylated neural cell adhesion
molecule, a molecule that is involved in migration and process elongation
of developing neurons. When animals were killed immediately (12 hr) after
BrdU injection, significantly fewer labeled cells were observed in the GCL
and adjacent subgranular zone of aged rats, indicative of a decrease in
mitotic activity of neuronal precursor cells. The reduced proliferation was
not attributable to a general aged- related metabolic impairment, because
the density of BrdU-positive cells was not altered in other brain regions
with known mitotic activity (e.g., hilus and lateral ventricle wall). The
decline in neurogenesis that occurs throughout the lifespan of an animal
can thus be related to a decreasing proliferation of granule cell
precursors.
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