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- Novel role of CaMKII in the maintenance and regulation of synaptic structure
$BNS!!9/5*!JM}8&(B-MIT Neuroscience Research Center$B!K(B
- $B!J#2!K(B
- Experience-driven
synaptic delivery of AMPA receptors in
vivo
$B9b66!!Bv:H(B (Cold
Spring Harbor Laboratory, Neurobiology)
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$BC+8}!!90
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- Translocation of
drebrin and F-actin from dendritic spines to shafts was regulated by myosin II
ATPase activity
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- Quantitative analysis of GABAA
receptor subunits expressed in hippocampal CA1 pyramidal cells by SDS-digested
freeze-fracture replica labeling (SDS-FRL)
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- Quantitative analysis of AMPA and
NMDA receptors in the retino- and cortico-geniculate synapses as revealed by
SDS-digested freeze-fracture replica labeling (SDS-FRL)
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$B!!(BThe synapse is a highly organized cellular
specialization that reorganizes its structure and composition according to
input strength-both positively and negatively. The mechanisms orchestrating
these changes remain largely elusive. We previously reported that activity
dependent bidirectional regulation of actin at the synapse is involved in
postsynaptic assembly-disassembly, and serves as a substrate for bidirectional
synaptic plasticity. Tetanic stimulation rapidly and persistently shifts the
F-actin/G-actin equilibrium towards F-actin in
dendritic spines. The molecular mechanism involving this regulation has not yet
been discovered.
$B!!(BWe have hypothesized that CaMKII, a serine/threonine protein kinase highly enriched in
excitatory synapses, is involved in this regulation. Here we present
experimental evidence suggesting that CaMKII has a structural role in
stabilizing actin cytoskeleton in dendritic spines.
$B9b66!!Bv:H(B $B!J(BCold Spring Harbor Laboratory, Neurobiology)
$B!!(BTThe molecular modifications that occur
in the intact vertebrate brain as a consequence of experience are still poorly
understood. One crucial question is whether natural stimuli in vivo induce the
synaptic delivery of GluR1.
$B!!(BTo test this, I injected Sindbis virus carrying
recombinant AMPA receptors into barrel cortex of rats with or without whiskers
in vivo at P12, an age characterized by rapid experience-dependent development
of barrel cortex circuitry. 2 days later, I cut acute slices and tested
delivery of AMPA receptors to synapses from layer4 to layer2/3 pyramidal
neurons with an electrophysiological technique. I found that recombinant and endogenous GluR1 were delivered
to synapses in the intact whisker rats but not in the deprived whisker rats.
This showed that synaptic delivery of GluR1 is experience-dependent. In vitro
experiments showed that synaptic delivery of GluR2 is activity-independent.
Consistent with these in vitro results, recombinant and endogenous GluR2 were
delivered to synapses both in the intact and deprived whisker rats. So the model, which was developed from
in vitro experiments, applies toexperience-dependent
plasticity in vivo.
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