Document Detail


Design and Characterization of a Novel Fluorinated Magnetic Resonance Imaging Agent for Functional Analysis of Bile Acid Transporter Activity.
MedLine Citation:
PMID:  23319170     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
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.
Authors:
Diana Vivian; Kunrong Cheng; Sandeep Khurana; Su Xu; Valerie Whiterock; Drew Witter; Kimberley A Lentz; Kenneth S Santone; Jean-Pierre Raufman; James E Polli
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-15
Journal Detail:
Title:  Pharmaceutical research     Volume:  -     ISSN:  1573-904X     ISO Abbreviation:  Pharm. Res.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-15     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8406521     Medline TA:  Pharm Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, Maryland, USA.
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