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Adult‐generated neurons in the dentate gyrus send axonal projections to field CA 3 and are surrounded by synaptic vesicles
Author(s) -
Markakis Eleni A.,
Gage Fred H.
Publication year - 1999
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/(sici)1096-9861(19990419)406:4<449::aid-cne3>3.0.co;2-i
Subject(s) - dentate gyrus , synaptophysin , calbindin , biology , neuroscience , synaptic vesicle , immunohistochemistry , hippocampal formation , hippocampus , anatomy , vesicle , biochemistry , membrane , immunology
The subgranule zone of the dentate gyrus in rats has been shown to be proliferative into adulthood and senescence. However, the connectivity of newly generated, identified neurons in the adult has not been definitively described. In the present study, 9 weeks after a series of intraperitoneal injections of 5‐bromo‐2′‐deoxyuridine (BrdU), animals received stereotaxic iontophoretic injections of Fluoro‐Gold (FG) into field CA 3 . Three weeks after FG injections, sections were analyzed for BrdU immunoreactivity (proliferative label), FG retrograde label, and either calbindin‐D 28k or synaptophysin immunohistochemistry. A large proportion (up to 44%) of BrdU‐labeled cells in the dentate gyrus within regions of FG retrograde label incorporated FG. All of the doubly labeled (BrdU‐FG) neurons also immunolabeled with the antibody to calbindin‐D 28k . Many doubly labeled (BrdU‐FG) cells were also surrounded in three planes by synaptophysin immunoreactivity. We conclude that newly generated neurons in the dentate gyrus have the correct immunohistochemical profile, send appropriate axonal projections to field CA 3 , and are surrounded by profiles containing synaptic vesicle proteins. J. Comp. Neurol. 406:449–460, 1999. © 1999 Wiley‐Liss, Inc.