Psychopharmacology

, Volume 195, Issue 4, pp 579–590

5-HT2A receptor density is decreased in the at-risk mental state

Authors

    • Brain Imaging Center West (BICW)Research Center Juelich
    • Department of PsychiatryUniversity of Bonn
  • Andreas Matusch
    • Institute of MedicineResearch Center Juelich
  • Kai-Uwe Kuhn
    • Department of PsychiatryUniversity of Bonn
  • Julia Berning
    • Department of PsychiatryUniversity of Bonn
  • David Elmenhorst
    • Institute of MedicineResearch Center Juelich
  • Oliver Winz
    • Institute of MedicineResearch Center Juelich
  • Heike Kolsch
    • Department of PsychiatryUniversity of Bonn
  • Karl Zilles
    • Brain Imaging Center West (BICW)Research Center Juelich
    • Institute of MedicineResearch Center Juelich
    • C. & O. Vogt Institute for Brain ResearchUniversity of Duesseldorf
  • Michael Wagner
    • Department of PsychiatryUniversity of Bonn
  • Wolfgang Maier
    • Brain Imaging Center West (BICW)Research Center Juelich
    • Department of PsychiatryUniversity of Bonn
  • Andreas Bauer
    • Brain Imaging Center West (BICW)Research Center Juelich
    • Institute of MedicineResearch Center Juelich
    • Department of NeurologyUniversity of Duesseldorf
Original Investigation

DOI: 10.1007/s00213-007-0921-x

Cite this article as:
Hurlemann, R., Matusch, A., Kuhn, K. et al. Psychopharmacology (2008) 195: 579. doi:10.1007/s00213-007-0921-x

Abstract

Rationale

Current perspectives on the pathophysiology of schizophrenia direct attention to serotonergic (serotonin, 5-HT) dysregulation in the prodrome or at-risk mental state (ARMS).

Objective

To study the cerebral 5-HT2A receptor (5-HT2AR) in the ARMS with [18F]altanserin positron emission tomography (PET) and a bolus-infusion paradigm.

Materials and methods

We quantified the spatial distribution of 5-HT2AR binding potential (BP1′) in never-medicated subjects assigned to early (n = 6) and late (n = 8) prodromal states of schizophrenia relative to healthy controls (n = 21). Five single nucleotide polymorphisms (SNPs) in the 5-HT2AR-encoding gene (HTR2A; 13q14-21) were genotyped to control for a potential bias in BP1′ due to between-group differences in genotype distributions.

Results

Group comparisons of partial-volume corrected PET data by statistical parametric mapping and confirmatory volume of interest analysis yielded a dissemination of BP1′ decreases consistent with increasing levels of risk. An additional decrease in caudate BP1′ was present in subjects who subsequently converted to first-episode psychosis (n = 5), but absent in non-converters (n = 9). Between-group differences were not confounded by a differential distribution of SNP genotypes.

Conclusion

These results suggest a progressive reduction of cortical 5-HT2AR density as a surrogate biological measure of increased risk for schizophrenia, irrespective of conversion. Progressive reductions of subcortical 5-HT2AR density could provide an indicator of illness activity and help to predict imminent conversion to schizophrenia. Moreover, our findings substantiate the rationale for establishing a phase-specific psychopharmacological intervention in the ARMS that addresses the serotonergic component of vulnerability to schizophrenia.

Keywords

SchizophreniaPsychosisProdromeAt-riskSerotonin5-HT5-HT2A ReceptorPET

Copyright information

© Springer-Verlag 2007