Decreased striatal monoaminergic terminals in Huntington disease.

Abstract:

OBJECTIVE:To evaluate the integrity of the dorsal striatal dopaminergic innervation in rigid and choreic Huntington disease (HD). BACKGROUND:Some patients with HD have an akinetic-rigid phenotype. It has been suggested that nigrostriatal in addition to striatal pathology is present in this subgroup. The authors sought to determine whether in vivo measures of striatal vesicular monoamine transporter type-2 (VMAT2) binding could distinguish patients with akinetic-rigid (HDr) from typical choreiform (HDc) HD. METHODS:Nineteen patients with HD (mean age 48 +/- 16 years) and 64 normal controls (mean age 50 +/- 14 years) underwent (+)-alpha-[11C]dihydrotetrabenazine (DTBZ) PET imaging. DTBZ blood to brain ligand transport (K1) and tissue to plasma distribution volume (DV) in the caudate nucleus, anterior putamen, and posterior putamen were normalized to the occipital cortex. RESULTS:The normalized striatal specific DV was reduced in HDr (n = 6) when compared with controls: caudate nucleus -33% (p < 0.001), anterior putamen -56% (p < 0.0001), and posterior putamen -75% (p < 0.0001). Patients with HDc (n = 13) also had reduced striatal DV: caudate nucleus -6% (NS), anterior putamen -19% (p < 0.01), and posterior putamen -35% (p < 0.0001). Patients with HDr had significantly lower striatal (+)-alpha-[11C]DTBZ binding than HDc patients. After correction for tissue atrophy effects, normalized DV differences were less significant, with values somewhat increased in the caudate, slightly reduced in the anterior putamen, and moderately decreased in the posterior putamen. There were no significant regional differences in K1 reductions among caudate, anterior, and posterior putamen in HD. CONCLUSIONS:Reduced striatal VMAT2 binding suggests nigrostriatal pathology in HD, most severely in the HDr phenotype. Striatal DV reductions were most prominent in the posterior putamen, similar to PD.

journal_name

Neurology

journal_title

Neurology

authors

Bohnen NI,Koeppe RA,Meyer P,Ficaro E,Wernette K,Kilbourn MR,Kuhl DE,Frey KA,Albin RL

doi

10.1212/wnl.54.9.1753

subject

Has Abstract

pub_date

2000-05-09 00:00:00

pages

1753-9

issue

9

eissn

0028-3878

issn

1526-632X

journal_volume

54

pub_type

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