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Striatal dopamine D1-like receptor binding is unchanged in primary focal dystonia.
Karimi, Morvarid; Moerlein, Stephen M; Videen, Tom O; Su, Yi; Flores, Hubert P; Perlmutter, Joel S.
Afiliación
  • Karimi M; Department of Neurology, Washington University School of Medicine, Saint Louis, Missouri, USA.
Mov Disord ; 28(14): 2002-6, 2013 Dec.
Article en En | MEDLINE | ID: mdl-24151192
BACKGROUND: Multiple studies have demonstrated decreases in striatal D2-like (D2, D3) radioligand binding in primary focal dystonias. Although most investigations have focused on D2-specific receptors (D2R), a recent study suggests that the decreased D2-like binding may be due to a D3-specific (D3R) abnormality. However, only limited data exist on the role of D1-specific receptors (D1R) and the D1R-mediated pathways within basal ganglia in dystonia. Metabolic positron emission tomography (PET) data in primary generalized dystonia suggest resting state over activity in the D1R-mediated direct pathway, leading to excessive disinhibition of motor cortical areas. This work investigated whether striatal D1-like receptors are affected in primary focal dystonias. METHODS: Striatal-specific (caudate and putamen) binding of the D1-like radioligand [(11)C]NNC 112 was measured using PET in 19 patients with primary focal dystonia (cranial, cervical, or arm) and 18 controls. RESULTS: No statistically significant difference was detected in striatal D1-like binding between the two groups. The study had 91% power to detect a 20% difference, indicating that false-negative results were unlikely. CONCLUSIONS: Because [(11)C]NNC 112 has high affinity for D1-like receptors, very low affinity for D2-like receptors, and minimal sensitivity to endogenous dopamine levels, we conclude that D1-like receptor binding is not impaired in these primary focal dystonias.
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Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Asunto principal: Receptores de Dopamina D1 / Cuerpo Estriado / Trastornos Distónicos Límite: Adult / Aged / Female / Humans / Male / Middle aged Idioma: En Revista: Mov Disord Asunto de la revista: NEUROLOGIA Año: 2013 Tipo del documento: Article País de afiliación: Estados Unidos

Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Asunto principal: Receptores de Dopamina D1 / Cuerpo Estriado / Trastornos Distónicos Límite: Adult / Aged / Female / Humans / Male / Middle aged Idioma: En Revista: Mov Disord Asunto de la revista: NEUROLOGIA Año: 2013 Tipo del documento: Article País de afiliación: Estados Unidos