5-HT1Agene promoter polymorphism and [18F]MPPF binding potential in healthy subjects: A PET study

Abstract

Background: Previous Positron Emission Tomography (PET) studies of 5-HT1Areceptors have shown an influence of several genetic factors, including the triallelic serotonin transporter gene-linked polymorphic region on the binding potential (BPND) of these receptors. The aim of our study was to investigate the relationship between a 5-HT1Apromoter polymorphism and the binding potential of another selective 5-HT1Areceptor antagonist, [18F]MPPF, in healthy subjects.Methods: Thirty-five volunteers, including 23 women, underwent an [18F]MPPF scan and were genotyped for both the C(-1019)G 5-HT1Apromoter polymorphism and the triallelic serotonin transporter gene-linked polymorphic region. We used a simplified reference tissue model to generate parametric images of BPND. Whole brain Statistical Parametric Mapping and raphe nuclei region of interest analyses were performed to look for an association of [18F]MPPF BPNDwith the C(-1019)G 5-HT1Apromoter polymorphism.Results: Among the 35 subjects, 5-HT1Apromoter genotypes occurred with the following frequencies: three G/G, twenty-one G/C, and eleven C/C. No difference of [18F]MPPF BPNDbetween groups was observed, except for two women who were homozygote carriers for the G allele and showed greater binding potential compared to other age-matched women over the frontal and temporal neocortex. However, the biological relevance of this result remains uncertain due to the very small number of subjects with a G/G genotype. These findings were not modified by excluding individuals carrying the S/S genotype of the serotonin transporter gene-linked polymorphic region.Conclusions: We failed to observe an association between the C(-1019)G 5-HT1Apromoter polymorphism and [18F]MPPF binding in healthy subjects. However our data suggest that the small number of women homozygote for the G allele might have greater [18F]MPPF BPNDrelative to other individuals. This finding should be confirmed in a larger sample. © 2010 Lothe et al; licensee BioMed Central Ltd.