Ishiwata K, Kawamura K, Kobayashi T, Matsuno K. Sigma1 and dopamine D2 receptor occupancy in the mouse brain after a single administration of haloperidol and two dopamine D2-like receptor ligands.
Nucl Med Biol 2003;
30:429-34. [PMID:
12767400 DOI:
10.1016/s0969-8051(03)00003-9]
[Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We investigated sigma(1) and dopamine D(2) receptor occupancy in mouse brain after a single injection of haloperidol, nemonapride, or spiperone using [(11)C]SA4503 and [(11)C]raclopride, respectively. Co-injection of the three compounds significantly blocked the uptake of each radioligand. Six hours later, only haloperidol blocked [(11)C]SA4503 uptake, while all three reduced [(11)C]raclopride uptake. Sigma(1) receptor occupancy by haloperidol was reduced to 19% at day 2 when D(2) receptor occupancy disappeared. [(11)C]SA4503 would be applicable to the investigation of sigma(1) receptor occupancy of antispychotic drugs using PET.
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