Enzyme inhibition of dopamine metabolism alters 6-[18F]FDOPA uptake in orthotopic pancreatic adenocarcinoma View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2013-03-14

AUTHORS

Johanna Tuomela, Sarita Forsback, Laura Haavisto, Tero Vahlberg, Tove J Grönroos, Olof Solin, Merja Haaparanta-Solin

ABSTRACT

BackgroundAn unknown location hampers removal of pancreatic tumours. We studied the effects of enzyme inhibitors on the uptake of 6-[18F]fluoro-l-3,4-dihydroxyphenylalanine ([18F]FDOPA) in the pancreas, aiming at improved imaging of pancreatic adenocarcinoma.MethodsMice bearing orthotopic BxPC3 pancreatic adenocarcinoma were injected with 2-deoxy-2-[18F]fluoro-d-glucose ([18F]FDG) and scanned with positron emission tomography/computed tomography (PET/CT). For [18F]FDOPA studies, tumour-bearing mice and sham-operated controls were pretreated with enzyme inhibitors of aromatic amino acid decarboxylase (AADC), catechol-O-methyl transferase (COMT), monoamine oxidase A (MAO-A) or a combination of COMT and MAO-A. Mice were injected with [18F]FDOPA and scanned with PET/CT. The absolute [18F]FDOPA uptake was determined from selected tissues using a gamma counter. The intratumoural biodistribution of [18F]FDOPA was recorded by autoradiography. The main [18F]FDOPA metabolites present in the pancreata were determined with radio-high-performance liquid chromatography.Results[18F]FDG uptake was high in pancreatic tumours, while [18F]FDOPA uptake was highest in the healthy pancreas and significantly lower in tumours. [18F]FDOPA uptake in the pancreas was lowest with vehicle pretreatment and highest with pretreatment with the inhibitor of AADC. When mice received COMT + MAO-A inhibitors, the uptake was high in the healthy pancreas but low in the tumour-bearing pancreas.ConclusionsCombined use of [18F]FDG and [18F]FDOPA is suitable for imaging pancreatic tumours. Unequal pancreatic uptake after the employed enzyme inhibitors is due to the blockade of metabolism and therefore increased availability of [18F]FDOPA metabolites, in which uptake differs from that of [18F]FDOPA. Pretreatment with COMT + MAO-A inhibitors improved the differentiation of pancreas from the surrounding tissue and healthy pancreas from tumour. Similar advantage was not achieved using AADC enzyme inhibitor, carbidopa. More... »

PAGES

18

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URI

http://scigraph.springernature.com/pub.10.1186/2191-219x-3-18

DOI

http://dx.doi.org/10.1186/2191-219x-3-18

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PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/23497589


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