regulation of anatomical plasticity at neuromuscular junctions - edoc
TRANSCRIPT
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α
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Finally, our results provide first insights about the mechanisms leading to per-
missiveness for plasticity in young adult DeSyn muscles, and suggest that regulation
ultimately targets the efficiency of postsynaptic cluster assembly (Kummer et al.,
2006, Kishi et al., 2005). This does not seem to involve the half-lives of synaptic
AChRs (Akaaboune et al., 1999, Brunneau et al. 2005), since these were affected to a
comparable extent by BotA in DeSyn and FaSyn muscles (not shown). The require-
ment for proteasome function is reminiscent of the role of ubiquitination and protea-
some-mediated degradation to modify the composition and plasticity of the postsynap-
tic apparatus at central glutamatergic synapses (DiAntonio and Hicke, 2004, Ehlers,
2003). Permissiveness for plasticity may involve the expression of specific ubiquitin
ligases in chronically paralyzed young adult DeSyn muscles, and proteasome-depen-
dent degradation of selected postsynaptic apparatus components (Ehlers, 2003). Such
a regulatory process through levels of critical cytosolic factors in muscle fibers could
account for the observation that AChR clusters on the same muscle fiber exhibited
comparable sizes and labeling intensities during plasticity. However, our results
would also be consistent with a presynaptic requirement of mTOR1 and/or protea-
some activity in BotA-induced plasticity. According to such a scenario, the regulatory
pathways might be required to produce a dispersion of permissive AChR clusters by
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the presynaptic nerve (Yee and Pestronk, 1987), e.g. by preventing the assembly of
adhesive complexes at the presynaptic terminal. Presynaptic modulation of anatomical
plasticity through mTOR1 and/or proteasome-mediated degradation pathways would
provide for further flexibility in how individual presynaptic nerves exhibit anatomical
plasticity in their target regions.
There is evidence to suggest that the principles for regulation of anatomical
plasticity in the target region revealed in this study might also apply to circuit assem-
bly and plasticity in the CNS. Thus: 1) coordinate regulation of sprouting and synapse
remodeling by synaptic activity and postsynaptic differentiation has been reported for
the assembly of circuits during development (Ruthazer et al., 2003, Zou and Cline,
1999); 2) slowly developing anatomical plasticity has been demonstrated in the adult
as a result of chronic functional alterations (Bareyre et al., 2004, Darian-Smith and
Gilbert, 1994). We find that the requirements for anatomical plasticity in the adult can
vary among individual postsynaptic targets (e.g. LGCDeSyn versus SOLDeSyn), and
that at some systems pronounced rearrangements in local connectivity take place in
the presence of synaptic activity (e.g. hippocampal mossy fiber terminals (Galimberti
et al., 2006)). The results of this study might thus provide a general conceptual frame-
work to investigate the relative roles of intrinsic postsynaptic factors, synapse-assem-
bling mechanisms and synaptic activity in locally regulating anatomical plasticity in
the target region.
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α
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μ μ μ
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μ
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Relationship between sprout extension and ectopic AChR clusters in BotA-treat-
ed DeSyn muscles. Green: nerves (mGFP); red: AChR (α-Bungarotoxin). a, Absence
of ectopic AChR clusters during the early stages of BotA-induced sprouting. NMJs
exhibit several short twisted sprouts (thin arrows) in the absence of BotA (left), or in
BotA-treated FaSyn muscles (second panel); 1-2 straight sprouts (larger arrows) grow
from many NMJs on DeSyn muscles at day +5 of the BotA treatment, but at this early
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time sprouts are not associated with ectopic AChR clusters. b, In vivo time-lapse
imaging of nerves and AChR clusters in BotA-treated LGCDeSyn and RFFaSyn. Note
gradual elongation of sprouts (indicated by separate numbers) on LGCDeSyn, changing
patterns of ectopic AChR clusters along sprout-1, and absence of clusters at distal
ends of most sprouts. For orientation, a red arrowhead marks the same LGCDeSyn
NMJ in the panels; small arrows (+16d, AChR, LGCDeSyn) indicate examples of two
ectopic clusters that were not detectable at day +14. See text for a more detailed de-
scription of these data. Bars: 50 μm.
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