Accumulated glutamate levels in the synaptic vesicle are not maintained in the absence of active transport

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Abstract

We have investigated factors which may affect accumulated glutamate levels in synaptic vesicles and glutamate efflux. Agents which dissipate the electrochemical proton gradient resulted in a rapid reduction of steady-state vesicular glutamate levels, which was prevented by N-ethylmaleimide. Glutamate efflux was found to occur even in the presence of an electrochemical proton gradient, but was effectively inhibited by N-ethylmaleimide. These results suggest that accumulated glutamate levels in synaptic vesicles are not maintained unless glutamate is taken up continuously by an active transport mechanism, and they could provide an explanation for the lack of convincing evidence for the enrichment of endogenous glutamate in isolated synaptic vesicles. © 1990.

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Carlson, M. D., & Ueda, T. (1990). Accumulated glutamate levels in the synaptic vesicle are not maintained in the absence of active transport. Neuroscience Letters, 110(3), 325–330. https://doi.org/10.1016/0304-3940(90)90868-A

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