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Glycosylation States of Pre- and Post-synaptic Markers of 5-HT Neurons Differ With Sex and 5-HTTLPR Genotype in Cortical Autopsy Samples
Journal article   Open access   Peer reviewed

Glycosylation States of Pre- and Post-synaptic Markers of 5-HT Neurons Differ With Sex and 5-HTTLPR Genotype in Cortical Autopsy Samples

Jennifer N. K Nyarko, Maa O Quartey, Ryan M Heistad, Paul R Pennington, Lisa J Poon, Kaeli J Knudsen, Odette Allonby, Amr M El Zawily, Andrew Freywald, Gail Rauw, …
Frontiers in neuroscience, Vol.12, pp.545-545
08/10/2018
DOI: 10.3389/fnins.2018.00545
PMCID: PMC6096231
PMID: 30147642
url
https://doi.org/10.3389/fnins.2018.00545View
Published (Version of record) Open Access

Abstract

The serotonin (5-hydroxytryptamine, 5-HT) transporter (5-HTT) gene-linked polymorphic region (5-HTTLPR) is thought to alter 5-HT signaling and contribute to behavioral and cognitive phenotypes in depression as well as Alzheimer disease (AD). We explored how well the short ( S ) and long ( L ) alleles of the 5-HTTLPR align with serotoninergic indices in 60 autopsied cortical samples from early-onset AD/EOAD and late-onset AD/LOAD donors, and age- and sex-matched controls. Stratifying data by either diagnosis-by-genotype or by sex-by-genotype revealed that the donor's 5-HTTLPR genotype, i.e., L / L, S / L , or S / S , did not affect 5-HTT mRNA or protein expression. However, the glycosylation of 5-HTT was significantly higher in control female ( vs . male) samples and tended to decrease in female EOAD/LOAD samples, but remained unaltered in male LOAD samples. Glycosylated forms of the vesicular monoamine transporter (VMAT2) were lower in both male and female AD samples, while a sex-by-genotype stratification revealed a loss of VMAT2 glycosylation specifically in females with an L / L genotype. VMAT2 and 5-HTT glycosylation were correlated in male samples and inversely correlated in female samples in both stratification models. The S / S genotype aligned with lower levels of 5-HT turnover in females (but not males) and with an increased glycosylation of the post-synaptic 5-HT2C receptor. Interestingly, the changes in presynaptic glycosylation were evident primarily in female carriers of the APOE ε4 risk factor for AD. Our data do not support an association between 5-HTTLPR genotype and 5-HTT expression, but they do reveal a non-canonical association of 5-HTTLPR genotype with sex-dependent glycosylation changes in pre- and post-synaptic markers of serotoninergic neurons. These patterns of change suggest adaptive responses in 5-HT signaling and could certainly be contributing to the female prevalence in risk for either depression or AD.
 Alzheimer disease antidepressant glycosylation mood disorder Neuroscience SLC6A4 synapse

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