## Abstract We used [^11^C]raclopride (RACLO) and positron emission tomography (PET) to study longitudinally striatal dopamine D~2~ receptor binding in nine patients with Parkinson's disease (PD) at an early drug‐naive stage and 3–5 years later, when motor fluctuations had appeared in seven of them
In vivo studies of [125I]iodobenzamide and [11C]iodobenzamide: A ligand suitable for positron emission tomography and single photon emission tomography imaging of cerebral D2 dopamine receptors
✍ Scribed by Dean F. Wong; Alan A. Wilson; Catherine Chen; Elynne Minkin; Robert F. Dannals; Hayden T. Ravert; Patricia Sanchez-Roa; Victor Villemagne; Henry N. Wagner Jr.
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 699 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0887-4476
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✦ Synopsis
Abstract
Iodobenzamide (IMB) labeled with either [^11^C] or [^125^I] was studied in mice and baboons. Pharmacological studies demonstrated an in vivo binding profile compatible with D~2~ dopamine receptors. Mouse biodistribution studies with both [^11^C]IMB and [^125^I]IMB showed a similar brain distribution of radioactivity. Mouse [^125^I]IMB studies with amphetamine and reserpine pretreatment suggested that IMB may be less susceptible to endogenous dopamine competition for D~2~ receptor binding in vivo as compared to raclopride. Preliminary baboon studies showed haloperidol competition for IMB binding sites. © 1992 Wiley‐Liss, Inc.
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