Abstract
We report that cholesterol depletion with methyl-β-cyclodextrin (MβCD) acutely applied to rat brain synaptosomes is accompanied by an immediate increase in transporter-mediated glutamate release and decrease in exocytotic release. To clarify the possible mechanisms underlying these phenomena, we investigated the influence of MβCD on synaptic vesicle acidification and exo/endocytotic process in nerve terminals. As shown by acridine orange fluorescence measurements, the application of MβCD to synaptosomes, as well as to isolated synaptic vesicles, led to the gradual leakage of the protons from the vesicles, whereas the application of MβCD complexed with cholesterol stimulated additional vesicle acidification and an increase in Ca2+-dependent exocytotic response. It was found that the treatment of nerve terminals with MβCD did not block Ca2+-triggered vesicle recycling. We suggest that cholesterol depletion of the plasma membrane with MβCD induces the removal of cholesterol from the membrane of synaptic vesicles resulting in immediate dissipation of synaptic vesicle proton gradient and redistribution of the neurotransmitter between the vesicular and cytosolic pools. The latter appears to be the main cause of a dramatic decrease in exocytotic and considerable increase in transporter-mediated release of l-[14C]glutamate.
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Abbreviations
- MβCD:
-
Methyl-β-cyclodextrin
- AO:
-
Acridine orange
- ∆μ H+ :
-
Synaptic vesicle electrochemical H+ gradient
- DL-TBOA:
-
DL-threo-beta-benzyloxyaspartate
- LDH:
-
Lactate dehydrogenase
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Acknowledgments
We would like to thank Dr. Sergey Karakhim for the excellent technical assistance and help in confocal microscopy studies.
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Tarasenko, A.S., Sivko, R.V., Krisanova, N.V. et al. Cholesterol Depletion from the Plasma Membrane Impairs Proton and Glutamate Storage in Synaptic Vesicles of Nerve Terminals. J Mol Neurosci 41, 358–367 (2010). https://doi.org/10.1007/s12031-010-9351-z
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DOI: https://doi.org/10.1007/s12031-010-9351-z