Physical Interactions and Functional Relationships of Neuroligin 2 and Midbrain Serotonin Transporters

Frontiers in Synaptic Neuroscience
Ran YeRandy D Blakely

Abstract

The neurotransmitter serotonin [5-hydroxytryptamine (5-HT)] modulates many key brain functions including those subserving sensation, emotion, reward, and cognition. Efficient clearance of 5-HT after release is achieved by the antidepressant-sensitive 5-HT transporter (SERT, SLC6A4). To identify novel SERT regulators, we pursued a proteomic analysis of mouse midbrain SERT complexes, evaluating findings in the context of prior studies that established a SERT-linked transcriptome. Remarkably, both efforts converged on a relationship of SERT with the synaptic adhesion protein neuroligin 2 (NLGN2), a post-synaptic partner for presynaptic neurexins, and a protein well-known to organize inhibitory GABAergic synapses. Western blots of midbrain reciprocal immunoprecipitations confirmed SERT/NLGN2 associations, and also extended to other NLGN2 associated proteins [e.g., α-neurexin (NRXN), gephyrin]. Midbrain SERT/NLGN2 interactions were found to be Ca(2+)-independent, supporting cis vs. trans-synaptic interactions, and were absent in hippocampal preparations, consistent with interactions arising in somatodendritic compartments. Dual color in situ hybridization confirmed co-expression of Tph2 and Nlgn2 mRNA in the dorsal raphe, with immun...Continue Reading

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Methods Mentioned

BETA
genotyping
PCR
electrophoresis
co-immunoprecipitation
X-ray
competition binding
co-immunoprecipitations
Co-immunoprecipitation assay
co-IP
immunoprecipitation

Software Mentioned

GraphPad
MudPIT ( Multidimensional Protein Identification Technology
iCheckClock
MudPIT
Adobe Photoshop
Empower
Scaffold
Sequest
Millennium
Prism

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