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Innervation and activity dependent dynamics of postsynaptic oxidative metabolism.

Abstract：

:Despite extensive investigations into the mechanisms of aerobic respiration in mitochondria, the spontaneous metabolic activity of individual cells within a whole animal has not been observed in real time. Consequently, little is known about whether and how the level of mitochondrial energy metabolism is regulated in a cell during development of intact systems. Here we studied the dynamics of postsynaptic oxidative metabolism by monitoring the redox state of mitochondrial flavoproteins, an established indicator of energy metabolism, at the developing Drosophila neuromuscular junction. We detected transient and spatially synchronized flavoprotein autofluorescence signals in postsynaptic muscle cells. These signals were dependent on the energy substrates and coupled to changes in mitochondrial membrane potential and Ca2+ concentration. Notably, the rate of autofluorescence signals increased during synapse formation through contact with the motoneuronal axon. This rate was also influenced by the magnitude of synaptic inputs. Thus, presynaptic cells tightly regulate postsynaptic energy metabolism presumably to maintain an energetic balance during neuromuscular synaptogenesis. Our results suggest that flavoprotein autofluorescence imaging should allow us to begin assessing the progress of synapse formation from a metabolic perspective.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Kazama H,Ichikawa A,Kohsaka H,Morimoto-Tanifuji T,Nose A

doi

10.1016/j.neuroscience.2007.12.020

subject

Has Abstract

pub_date

2008-03-03 00:00:00

pages

40-9

issue

1

eissn

0306-4522

issn

1873-7544

pii

S0306-4522(07)01558-8

journal_volume

152

pub_type

杂志文章

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