Design and characterization of a novel fluorinated magnetic resonance imaging agent for functional analysis of bile Acid transporter activity.
Pharm Res
; 30(5): 1240-51, 2013 May.
Article
en En
| MEDLINE
| ID: mdl-23319170
PURPOSE: To synthesize a trifluorinated bile acid that can be used for (19)F magnetic resonance imaging (MRI) of bile acid enterohepatic circulation, characterize its in vitro transporter affinity, stability, and (19)F-MRI signal, and assess its ability to concentrate in the gallbladder of C57BL/6 mice. METHODS: Target compound CA-lys-TFA was synthesized and tested for affinity toward the apical sodium dependent bile acid transporter (hASBT) and the Na+/taurocholate cotransporting polypeptide (hNTCP). In a pilot study, fasted mice were gavaged with vehicle control, 150 mg/kg or 300 mg/kg CA-lys-TFA. CA-lys-TFA in gallbladder, liver and plasma at t = 5 h was quantified. Additionally, a 24-h time course (24 mice across eight time points) was studied using 50 mg/kg CA-lys-TFA. RESULTS: CA-lys-TFA was a potent substrate of hASBT (Kt = 39.4 µM, normalized Vmax = 0.853) and hNTCP (Kt = 8.99 µM, normalized Vmax = 0.281). (19)F MRI phantom imaging showed linear signal-concentration dependence. In vivo studies showed that rapid accumulation of CA-lys-TFA in the gallbladder was maximal within 4-7 h. CONCLUSIONS: These findings suggest that CA-lys-TFA, a fluorinated non-radioactive bile acid analogue, has potential for use in MRI to measure in vivo bile acid transport and diagnose bile acid malabsorption and other conditions associated with impaired bile acid transport.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Ácidos y Sales Biliares
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Imagen por Resonancia Magnética
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Transportadores de Anión Orgánico Sodio-Dependiente
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Simportadores
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Vesícula Biliar
Límite:
Animals
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Humans
Idioma:
En
Revista:
Pharm Res
Año:
2013
Tipo del documento:
Article
País de afiliación:
Estados Unidos
Pais de publicación:
Estados Unidos