Distinct roles for primate caudate dopamine D1 and D2 receptors in visual discrimination learning revealed using shRNA knockdown.

Abstract:

:The striatum plays important motor, associative and cognitive roles in brain functions. However, the rodent dorsolateral (the primate putamen) and dorsomedial (the primate caudate nucleus) striatum are not anatomically separated, making it difficult to distinguish their functions. By contrast, anatomical separation exists between the caudate nucleus and putamen in primates. Here, we successfully decreased dopamine D1 receptor (D1R) or D2R mRNA expression levels selectively in the marmoset caudate using shRNA knockdown techniques, as determined using positron emission tomography imaging with specific D1R and D2R ligands and postmortem in situ hybridization analysis. We then conducted a voxel-based correlation analysis between binding potential values of PET imaging and visual discrimination learning task performance in these genetically modified marmosets to find a critical role for the caudate D2R but no apparent role for the caudate D1R. This latter finding challenges the current understanding of the mechanisms underlying D1R activation in the caudate.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Takaji M,Takemoto A,Yokoyama C,Watakabe A,Mizukami H,Ozawa K,Onoe H,Nakamura K,Yamamori T

doi

10.1038/srep35809

subject

Has Abstract

pub_date

2016-11-02 00:00:00

pages

35809

issn

2045-2322

pii

srep35809

journal_volume

6

pub_type

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