TY - JOUR
T1 - Distinct populations of cells in the adult dentate gyrus undergo mitosis or apoptosis in response to adrenalectomy
AU - Cameron, Heather A.
AU - Gould, Elizabeth
N1 - Copyright:
Copyright 2007 Elsevier B.V., All rights reserved.
PY - 1996
Y1 - 1996
N2 - Granule neurons of the rat dentate gyrus are born in adulthood as well as during development. Apoptotic cell death also occurs normally in this population throughout the life of the rat. Removal of adrenal steroids results in both increased production and increased degeneration of dentate gyrus granule cells. In order to determine whether the age of a cell affects its response to adrenalectomy (ADX), the numbers of dentate gyrus cells of different ages were assessed following ADX or sham operation. Older cells, i.e., those labeled with the thymidine analog bromodeoxyuridine (BrdU) on postnatal day (P) 6, were reduced in number following ADX on P60, and some had the morphologic characteristics of degenerating cells, indicating that significant numbers of mature cells die in response to ADX. In contrast, the number of younger cells, labeled with 3H-thymidine or BrdU in adulthood, 24 hours or 2 weeks before ADX, did not decrease, suggesting that these less mature cells do not die following ADX. An increase in the number of cells that are immunoreactive for proliferating cell nuclear antigen, a marker of dividing or recently mitotic cells, indicates that immature dentate gyrus cells divide following ADX. These results suggest that following ADX, mature cells born during the 1st postnatal week die, whereas immature cells divide.
AB - Granule neurons of the rat dentate gyrus are born in adulthood as well as during development. Apoptotic cell death also occurs normally in this population throughout the life of the rat. Removal of adrenal steroids results in both increased production and increased degeneration of dentate gyrus granule cells. In order to determine whether the age of a cell affects its response to adrenalectomy (ADX), the numbers of dentate gyrus cells of different ages were assessed following ADX or sham operation. Older cells, i.e., those labeled with the thymidine analog bromodeoxyuridine (BrdU) on postnatal day (P) 6, were reduced in number following ADX on P60, and some had the morphologic characteristics of degenerating cells, indicating that significant numbers of mature cells die in response to ADX. In contrast, the number of younger cells, labeled with 3H-thymidine or BrdU in adulthood, 24 hours or 2 weeks before ADX, did not decrease, suggesting that these less mature cells do not die following ADX. An increase in the number of cells that are immunoreactive for proliferating cell nuclear antigen, a marker of dividing or recently mitotic cells, indicates that immature dentate gyrus cells divide following ADX. These results suggest that following ADX, mature cells born during the 1st postnatal week die, whereas immature cells divide.
KW - adrenal steroids
KW - cell death
KW - cell division
KW - granule cell
KW - hippocampus
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U2 - 10.1002/(SICI)1096-9861(19960520)369:1<56::AID-CNE4>3.0.CO;2-J
DO - 10.1002/(SICI)1096-9861(19960520)369:1<56::AID-CNE4>3.0.CO;2-J
M3 - Article
C2 - 8723702
AN - SCOPUS:0029960815
SN - 0021-9967
VL - 369
SP - 56
EP - 63
JO - Journal of Comparative Neurology
JF - Journal of Comparative Neurology
IS - 1
ER -