RGD Reference Report - Striatal neurochemical changes in transgenic models of Huntington's disease. - Rat Genome Database

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Striatal neurochemical changes in transgenic models of Huntington's disease.

Authors: Ariano, MA  Aronin, N  DiFiglia, M  Tagle, DA  Sibley, DR  Leavitt, BR  Hayden, MR  Levine, MS 
Citation: Ariano MA, etal., J Neurosci Res. 2002 Jun 15;68(6):716-29.
RGD ID: 5686414
Pubmed: PMID:12111832   (View Abstract at PubMed)
DOI: DOI:10.1002/jnr.10272   (Journal Full-text)

Transgenic mouse models of Huntington's disease (HD) were examined following the onset of overt behavioral symptoms. The HD transgenic mice demonstrated profound striatal losses in D1, D2, and D3 dopamine (DA) receptor proteins in comparison with their nonsymptomatic, age-matched littermate controls. In parallel, a robust increase in the striatal D5 DA receptor subtype occurred in the transgenic compared with the wild-type control mice. This receptor elevation was accompanied by heightened cyclic AMP levels, which may be induced by the adenylyl cyclase-linked D5 receptor. This is a unique result; normal striatal D5 protein levels are modest and not thought to contribute substantially to cyclic AMP-mediated DA signaling mechanisms. Simple compensatory up-regulation of D5 DA receptors in response to D1 receptor subtype loss does not explain our findings, because genetic inactivation of the D1 DA receptor does not alter levels of D5 DA receptor expression. Immunofluorescent detection of tyrosine hydroxylase showed that nigrostriatal DA containing terminals were reduced, further supporting that disturbances in DA signaling occurred in HD transgenic models. The substance P-containing striatal efferent pathway was more resistant to the HD mutation than met-enkephalin-producing striatal projection neurons in the transgenics, based on neuropeptide immunofluorescent staining. Analogous findings in multiple transgenic models suggest that these changes are due to the presence of the transgene and are not dependent on its composition, promotor elements, or mouse strain background. These findings suggest modifications in the striatal DA system and that its downstream signaling through cyclic AMP mechanisms is disrupted severely in HD following onset of motor symptoms.

RGD Manual Disease Annotations    Click to see Annotation Detail View

Objects Annotated

Genes (Rattus norvegicus)
Drd1  (dopamine receptor D1)
Drd2  (dopamine receptor D2)
Drd3  (dopamine receptor D3)
Drd5  (dopamine receptor D5)

Genes (Mus musculus)
Drd1  (dopamine receptor D1)
Drd2  (dopamine receptor D2)
Drd3  (dopamine receptor D3)
Drd5  (dopamine receptor D5)

Genes (Homo sapiens)
DRD1  (dopamine receptor D1)
DRD2  (dopamine receptor D2)
DRD3  (dopamine receptor D3)
DRD5  (dopamine receptor D5)


Additional Information