Serotonin Transporter Distribution in the Brainstem of Multiple-System Atrophy-Parkinsonian Type: Insights from Pathology and <sup>123</sup>I-FP-CIT SPECT Findings.

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Studies have demonstrated loss of serotonergic neurons in the brainstems of patients with multiple-system atrophy (MSA). This study aimed to semiquantitatively investigate the status of serotonin transporter (SERT) distribution in the brainstem of individuals with MSA-parkinsonian type (MSA-P) via 123I-2β-carbomethoxy-3β-(4-iodophenyl)nortropane (123I-FP-CIT) SPECT and compare it with pathologic findings in some cases. Methods: We administered 123I-FP-CIT intravenously to 19 patients with MSA-P and 17 healthy controls (HCs) and performed SPECT and MRI scans. Specific binding ratio (SBR) images were generated, and summed voxel-based SBRs for the midbrain, pons, and entire brainstem were quantified. The Mann-Whitney U test was used to compare the MSA-P and HC groups, and receiver operating characteristic curves were used to analyze the midbrain-to-pons ratio of the summed voxel-based SBR. Further, we assessed postmortem SERT immunohistochemistry pathology in the brainstems of representative MSA-P cases and HCs to compare the distribution and density of SERT with SPECT findings. Results: 123I-FP-CIT SPECT results revealed a significant summed voxel-based SBR decrease in the midbrain and an increase in the pons in the MSA-P group, although the brainstem summed voxel-based SBRs did not differ significantly (P 123I-FP-CIT SPECT findings, demonstrated a significant decrease in SERT expression in the substantia nigra and a significant increase in the pontine raphe nucleus in patients with MSA-P. Conclusion: Our results indicate differences in SERT distribution in the brainstems of patients with MSA-P and HCs.

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