Brief communication: ß-cell function influences dopamine receptor availability.
PLoS One
; 14(3): e0212738, 2019.
Article
en En
| MEDLINE
| ID: mdl-30849082
ABSTRACT
We aim to identify physiologic regulators of dopamine (DA) signaling in obesity but previously did not find a compelling relationship with insulin sensitivity measured by oral-minimal model (OMM) and DA subtype 2 and 3 receptor (D2/3R) binding potential (BPND). Reduced disposition index (DI), a ß-cell function metric that can also be calculated by OMM, was shown to predict a negative reward behavior that occurs in states of lower endogenous DA. We hypothesized that reduced DI would occur with higher D2/3R BPND, reflecting lower endogenous DA. Participants completed PET scanning, with a displaceable radioligand to measure D2/3R BPND, and a 5-hour oral glucose tolerance test to measure DI by OMM. We studied 26 age-similar females without (n = 8) and with obesity (n = 18) (22 vs 39 kg/m2). Reduced DI predicted increased striatal D2/3R BPND independent of BMI. By accounting for ß-cell function, we were able to determine that the state of insulin and glucose metabolism is pertinent to striatal D2/3R BPND in obesity. Clinical Trial Registration Number NCT00802204.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Receptores de Dopamina D2
/
Cuerpo Estriado
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Tomografía de Emisión de Positrones
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Células Secretoras de Insulina
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Receptores de Dopamina D3
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Obesidad
Tipo de estudio:
Prognostic_studies
Límite:
Adult
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Female
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Humans
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Middle aged
Idioma:
En
Año:
2019
Tipo del documento:
Article