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- W1988707916 abstract "Uptake of neurotransmitters into synaptic vesicles is driven by an electrochemical gradient generated by a vacuolar-type proton pump ATPase. This uptake implies a key role for synaptic vesicles in the regulation of neurotransmitter systems. Guanine nucleoside and nucleotides are involved in the inhibition of glutamate-induced cellular responses via an extracellular action and diverse trophic, proliferative, and modulatory effects of guanine nucleotides on neural cells have been shown. Here, we characterized the uptake of GTP into synaptic vesicles isolated from whole rat brain, by using a tritiated poorly-hydrolyzable GTP analog, 5'-guanylylimidodiphosphate ([3H]GppNHp). Uptake of GTP into synaptic vesicles is saturable, time- and temperature-dependent, and relies on a proton-eletrochemical gradient. However, [3H]GMP and [3H]GDP radioactive labeling in synaptic vesicles is not dependent on temperature and vesicular ATPase activity, which indicates that these nucleotides only bind to and are not taken up into synaptic vesicles. GTP is taken up by the same eletrochemical gradient-dependent transport system, as are neurotransmitters storage, which indicates that this guanine nucleotide may also function as a neurotransmitter." @default.
- W1988707916 created "2016-06-24" @default.
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- W1988707916 date "2006-01-01" @default.
- W1988707916 modified "2023-09-26" @default.
- W1988707916 title "GTP uptake into rat brain synaptic vesicles" @default.
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- W1988707916 doi "https://doi.org/10.1016/j.brainres.2005.10.099" @default.
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