Dopamine in the hippocampal dentate gyrus modulates spatial learning via D1-like receptors.

Abstract:

:Increasing evidence supports that dopamine (DA) plays an important role in the hippocampal function via activation of D1-like receptors (D1Rs). As the entry structure of the hippocampal formation, the hippocampal dentate gyrus (DG) is critically involved in spatial learning and memory. Despite a number of studies investigated how DA influences CA1 plasticity and learning, there are fewer studies examining the influence of DA signaling to the DG. To investigate the roles of DA and D1Rs of the DG in modulation of spatial learning and memory, the spatial learning and memory abilities of rats were measured by Morris water maze (MWM), and then the concentration of DA in the DG region was determined by in vivo brain microdialysis and HPLC. Next, the effects of local microinjection of SCH23390 (an antagonist of D1Rs) on extracellular levels of excitatory amino acids (EAAs), including glutamate (Glu) and aspartate (Asp), were measured in the DG region during MWM test in freely-moving conscious rats. During the place navigation trial of MWM test, the escape latency was decreased with the increase in training days, and DA concentration in the DG was significantly increased. In SCH23390 group rats, the escape latency was increased in place navigation trial and the percentage of time spent in target quadrant and the number of platform crossings were decreased in spatial probe trial during MWM test, compared with vehicle group. Furthermore, in vehicle group rats, the extracellular levels of Glu and Asp in the DG were significantly increased during place navigation trial of MWM test, and these responses were partly inhibited by microinjection of SCH23390. Our results suggest that DA activation of D1Rs in the hippocampal DG promotes spatial learning and memory, in part by modulating the responses of EAAs during spatial learning.

journal_name

Brain Res Bull

journal_title

Brain research bulletin

authors

Wang F,Wan P,Wang W,Xiao B,Jin H,Jin Q

doi

10.1016/j.brainresbull.2018.11.010

subject

Has Abstract

pub_date

2019-01-01 00:00:00

pages

101-107

eissn

0361-9230

issn

1873-2747

pii

S0361-9230(18)30443-X

journal_volume

144

pub_type

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