LAMP5 Fine-Tunes GABAergic Synaptic Transmission in Defined Circuits of the Mouse Brain.
2016
LAMP5 is member of the LAMP family of membrane proteins. In contrast to the canonical members of this
protein family,
LAMP1and
LAMP2, which show widespread expression in many tissues, LAMP 5 is brain specific in mice. In C. elegans, the LAMP5 ortholog UNC-46 has been suggested to act a trafficking chaperone, essential for the correct targeting of the nematode vesicular
GABA-transporterUNC-47. We show here that in the mouse brain LAMP5 is expressed in subpopulations of
GABAergicforebrain neurons in the striato-nigral system and the
olfactory bulb. The protein was present at
synaptic terminals, overlapping with the mammalian vesicular
GABA-transporterVGAT. In LAMP5-deficient mice localization of the transporter was unaffected arguing against a conserved role in VGAT trafficking. Electrophysiological analyses in mutants showed alterations in short term synaptic plasticity suggesting that LAMP5 is involved in controlling the dynamics of evoked
GABAergictransmission. At the behavioral level, LAMP5 mutant mice showed decreased anxiety and deficits in olfactory discrimination. Altogether, this work implicates LAMP5 function in
GABAergicneurotransmission in defined neuronal subpopulations.
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