Linked Life Data

1740713

Source:http://linkedlifedata.com/resource/pubmed/id/1740713

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1992-3-26
pubmed:abstractText
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.
pubmed:grant
pubmed:commentsCorrections
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0161-5505
pubmed:author
pubmed:issnType
Print
pubmed:volume
33
pubmed:owner
NLM
pubmed:authorsComplete
N
pubmed:pagination
423-30
pubmed:dateRevised
2011-11-17
pubmed:meshHeading
pubmed:year
1992
pubmed:articleTitle
Synthesis, rodent biodistribution, dosimetry, metabolism, and monkey images of carbon-11-labeled (+)-2 alpha-tropanyl benzilate: a central muscarinic receptor imaging agent.
pubmed:affiliation
Division of Nuclear Medicine, University of Michigan, Ann Arbor 48109.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S., Research Support, U.S. Gov't, Non-P.H.S.