Synthesis, rodent biodistribution, dosimetry, metabolism, and monkey images of carbon-11-labeled (+)-2 alpha-tropanyl benzilate: a central muscarinic receptor imaging agent.


Journal Article

Muscarinic cholinergic receptors (mAChR) are abundant in the brain, and the mAChR system mediates many aspects of brain function. There is evidence of alterations in muscarinic binding in degenerative brain disorders. A muscarinic receptor radioligand, carbon-11-(+)-2 alpha-tropanyl benzilate ([11C]TRB), has been prepared through N-[11C]methylation of N-desmethyl TRB, and evaluated in rodents and primates. Full body biodistribution in rats has been determined and the expected human dosimetry calculated. Comparisons with [11C]scopolamine in rats showed 2-6 times greater brain uptake of [11C] TRB. Highly specific and saturable binding of [11C]TRB in the striatum and cortex was demonstrated by greater than 85% blockade of uptake following QNB or scopolamine pretreatment. Striatum/cerebellum ratios in mice at 60 min exceeded 12.6. TLC analysis of rat tissues showed the absence of 11C-metabolites in brain and heart, and a rapid solid phase C-18 Sep-Pak method found that unmetabolized plasma [11C]TRB in monkeys fell from 81% at 5 min to 48% at 80 min. Finally, brains of living primates have been imaged using PET and [11C]TRB; regional localization was consistent with muscarinic receptor distribution. These results represent intermediate steps in the development of [11C]TRB for quantification of central muscarinic receptors in man.

Full Text

Duke Authors

Cited Authors

  • Mulholland, GK; Otto, CA; Jewett, DM; Kilbourn, MR; Koeppe, RA; Sherman, PS; Petry, NA; Carey, JE; Atkinson, ER; Archer, S

Published Date

  • March 1992

Published In

Volume / Issue

  • 33 / 3

Start / End Page

  • 423 - 430

PubMed ID

  • 1740713

Pubmed Central ID

  • 1740713

Electronic International Standard Serial Number (EISSN)

  • 1535-5667

International Standard Serial Number (ISSN)

  • 0161-5505


  • eng