Postfusional regulation of cleft glutamate concentration during LTP at ‘silent synapses’.
In: Nature Neuroscience, Jg. 3 (2000-04-01), Heft 4, S. 330-336
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Zugriff:
‘Silent synapses’ show responses from high-affinity NMDA receptors (NMDARs) but not low-affinity AMPA receptors (AMPARs), but gain AMPAR responses upon long-term potentiation (LTP). Using the rapidly reversible NMDAR antagonist l-AP5 to assess cleft glutamate concentration ([glu]cleft), we found that it peaked at ≪170 μM at silent neonatal synapses, but greatly increased after potentiation. Cyclothiazide (CTZ), a potentiator of AMPAR, revealed slowly rising AMPA EPSCs at silent synapses; LTP shortened their rise times. Thus, LTP at silent synapses increased rate-of-rise and peak amplitude of [glu]cleft. Release probability reported by NMDARs remained unchanged during LTP, implying that [glu]cleft increases arose from immediately presynaptic terminals. Our data suggest that changes in the dynamics of fusion-pore opening contribute to LTP. [ABSTRACT FROM AUTHOR]
Titel: |
Postfusional regulation of cleft glutamate concentration during LTP at ‘silent synapses’.
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Autor/in / Beteiligte Person: | Choi, Sukwoo ; Klingauf, Jürgen ; Tsien, Richard W. |
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Zeitschrift: | Nature Neuroscience, Jg. 3 (2000-04-01), Heft 4, S. 330-336 |
Veröffentlichung: | 2000 |
Medientyp: | academicJournal |
ISSN: | 1097-6256 (print) |
DOI: | 10.1038/73895 |
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