期刊
JOURNAL OF NEUROSCIENCE
卷 22, 期 1, 页码 142-155出版社
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.22-01-00142.2002
关键词
DNPI; BNPI; VGLUT1; VGLUT2; synaptic vesicle; excitatory synapse; vesicular glutamate transporter; glutamate release; chloride ion; synaptic plasticity; release probability
资金
- NINDS NIH HHS [NS 36936, R01 NS036936] Funding Source: Medline
- NATIONAL INSTITUTE OF NEUROLOGICAL DISORDERS AND STROKE [R01NS036936] Funding Source: NIH RePORTER
Glutamate transport into synaptic vesicles is a prerequisite for its regulated neurosecretion. Here we functionally identify a second isoform of the vesicular glutamate transporter (VGLUT2) that was previously identified as a plasma membrane Na+-dependent inorganic phosphate transporter (differentiation-associated Na+/P-I transporter). Studies using intracellular vesicles from transiently transfected PC12 cells indicate that uptake by VGLUT2 is highly selective for glutamate, is H+ dependent, and requires Cl- ion. Both the vesicular membrane potential (Delta psi) and the proton gradient (Delta pH) are important driving forces for vesicular glutamate accumulation under physiological Cl- concentrations. Using an antibody specific for VGLUT2, we also find that this protein is enriched on synaptic vesicles and selective for a distinct class of glutamatergic nerve terminals. The pathway-specific, complementary expression of two different vesicular glutamate transporters suggests functional diversity in the regulation of vesicular release at excitatory synapses. Together, the two isoforms may account for the uptake of glutamate by synaptic vesicles from all central glutamatergic neurons.
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