期刊
SYNAPSE
卷 62, 期 11, 页码 873-876出版社
WILEY-BLACKWELL
DOI: 10.1002/syn.20573
关键词
dihydrotetrabenazine; vesicular monoamine transporter; positron emission tomography
Binding of (+)-[(11)C]DTBZ (dihydrotetrabenazine) to the striatal vesicular monoamine transporter (VMAT2) is widely considered to be a stable marker of dopamine neurone integrity. However, we now find that specific binding of a tracer dose of (+)-[(11)C]DTBZ is modestly increased in rat striatum following dopamine depletion with alpha-methyl p-tyrosine (alpha-MPT, +14%) or d-amphetamine (d-AMPH, 20 mg/kg, +12%) and decreased following dopamine elevation with gamma-hydroxybutyrate (GHB, -16%) or levodopa (-20%). We suggest that in vivo (+)-[(11)C]DTBZ binding in imaging studies is subject to competition by vesicular dopamine and, in this respect, is not a stable dopamine biomarker as is generally assumed.
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