Document Detail

[N-methyl-11C]cholylsarcosine, a novel bile acid tracer for PET/CT of hepatic excretory function: radiosynthesis and proof-of-concept studies in pigs.
MedLine Citation:
PMID:  22454486     Owner:  NLM     Status:  MEDLINE    
METHODS: A method for radiosynthesis of (11)C-cholylsarcosine was developed involving (11)C-methylation of glycine followed by conjugation with cholic acid. Blood-to-liver uptake and liver-to-bile excretion were investigated in vivo by dynamic (11)C-cholylsarcosine PET/CT of 2 anesthetized pigs. In pig 1, a second dynamic (11)C-cholylsarcosine PET/CT examination was preceded by a high dose of the endogenous bile acid conjugate cholyltaurine to investigate possible inhibition of the transhepatocellular transport of (11)C-cholylsarcosine. In pig 2, a second (11)C-cholylsarcosine administration was given to determine the biodistribution of the tracer by means of 5 successive whole-body PET/CT recordings. Possible formation of (11)C-metabolites was investigated by analysis of blood and bile samples from a third pig.
RESULTS: The radiochemical yield was 13% ± 3% (n = 7, decay-corrected) and up to 1.1 GBq of (11)C-cholylsarcosine was produced with a radiochemical purity greater than 99%. PET/CT studies showed rapid blood-to-liver uptake and liver-to-bile excretion of (11)C-cholylsarcosine, with radioactivity concentrations being more than 90 times higher in the bile ducts than in liver tissue. Cholyltaurine inhibited the transhepatocellular transport of (11)C-cholylsarcosine, indicating that the tracer is transported by one or more of the same hepatic transporters as cholyltaurine. (11)C-cholylsarcosine underwent an enterohepatic circulation and reappeared in liver tissue and bile ducts after approximately 70 min. There were no detectable (11)C-metabolites in the plasma or bile samples, indicating that the novel conjugated bile acid (11)C-cholylsarcosine was not metabolized in the liver or in the intestines. The effective absorbed dose of (11)C-cholylsarcosine was 4.4 μSv/MBq.
CONCLUSION: We have synthesized a novel conjugated bile acid analog, (11)C-cholylsarcosine, and PET/CT studies on anesthetized pigs showed that the hepatic handling of tracer uptake from blood and excretion into the bile was comparable to that for the endogenous bile acid cholyltaurine. This tracer may be valuable for future studies of normal and pathologic hepatic excretory functions in humans.
Kim Frisch; Steen Jakobsen; Michael Sørensen; Ole Lajord Munk; Aage K O Alstrup; Peter Ott; Alan F Hofmann; Susanne Keiding
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2012-03-27
Journal Detail:
Title:  Journal of nuclear medicine : official publication, Society of Nuclear Medicine     Volume:  53     ISSN:  1535-5667     ISO Abbreviation:  J. Nucl. Med.     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-05-02     Completed Date:  2012-06-25     Revised Date:  2013-06-26    
Medline Journal Info:
Nlm Unique ID:  0217410     Medline TA:  J Nucl Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  772-8     Citation Subset:  IM    
PET Center, Aarhus University Hospital, Aarhus, Denmark.
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MeSH Terms
Bile Acids and Salts / metabolism*
Cholic Acids / chemical synthesis*,  diagnostic use*,  metabolism,  pharmacokinetics
Liver / metabolism,  physiology*,  radionuclide imaging*
Liver Function Tests / methods*
Positron-Emission Tomography and Computed Tomography / methods*
Radioactive Tracers
Sarcosine / analogs & derivatives*,  chemical synthesis,  diagnostic use,  metabolism,  pharmacokinetics
Grant Support
Reg. No./Substance:
0/Bile Acids and Salts; 0/Cholic Acids; 0/Radioactive Tracers; 107-97-1/Sarcosine; 93790-70-6/cholylsarcosine

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