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Alteration of hippocampal cell proliferation in mice lacking the beta(2) subunit of the neuronal nicotinic acetylcholine receptor

journal contribution
posted on 2023-06-07, 18:30 authored by Alexia Harrist, Robert D Beech, Sarah KingSarah King, Alessio Zanardi, Muriel A Cleary, Barbara J Caldarone, Amelia Eisch, Michele Zoli, Marina R Picciotto
Adult hippocampal neurogenesis declines with age in parallel with decreased performance on a variety of hippocampal-dependent tasks. We measured the rate of cellular proliferation in the hippocampus of mice lacking the 02-subunit of the nicotinic acetylcholine receptor (beta2-/- mice) at three ages: young adult (3 months old), fully adult (7-10 months old), and aged (22-24 months old). Consistent with previous studies, we observed an age-related decline in hippocampal proliferation in both groups. However, in fully adult beta2-/- mice a 43% reduction of granule cell proliferation was detected compared to age-matched controls. This was accompanied by a significant decrease in dentate gyrus area/section and the length of the granule cell layer in beta2-/- mice. These alterations were not the result of a change in plasma corticosterone levels or expression of the neurotrophic factor BDNF in the dentate gyrus, two known regulators of hippocampal cell proliferation. Similarly, there was no increase in gliosis, abnormal myelination, or apoptotic cell death in the beta2-/- animals, although there was a significant shift in the location of apoptotic cells in the dentate gyrus indicative of a change in neuronal survival. These results suggest that the beta2-subunit containing nicotinic acetylcholine receptors play an important role in regulating cell proliferation in the hippocampus and that endogenous acetylcholine may act to oppose the negative effects of normal aging and stress on cellular proliferation

History

Publication status

  • Published

Journal

Synapse

ISSN

0887-4476

Publisher

Wiley-Blackwell

Issue

4

Volume

54

Page range

200-206

Department affiliated with

  • Psychology Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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