Capture of extracellular zinc ions by astrocytes.

Abstract:

:Synaptic zinc ions released during synaptic transmission interact with pre- and postsynaptic neuroreceptors, thus modulating neurotransmission. It is likely that they have to be efficiently cleared from the extracellular milieu to assure subsequent synaptic events. Both neurons and glia are assumed to participate in this clearance by mechanisms that are not fully understood. In this study, electron microscopic zinc cytochemistry has shown zinc-electrondense particles associated with hippocampal astrocytic membranes frequently found accumulated in stacked lamellae. In cultured astrocytes, the use of zinc fluorochromes and endocytic markers allowed the simultaneous imaging of the capture of extracellular zinc simultaneously to plasma membrane markers; this endocytic process was inhibited by high sucrose concentrations. Finally, electron microscopy of zinc-loaded and fluorochrome photoconverted cells demonstrated some early events of extracellular zinc capture as well as its late accumulation in lysosome-like organelles.

journal_name

Glia

journal_title

Glia

authors

Varea E,Alonso-Llosà G,Molowny A,Lopez-Garcia C,Ponsoda X

doi

10.1002/glia.20382

subject

Has Abstract

pub_date

2006-09-01 00:00:00

pages

304-15

issue

4

eissn

0894-1491

issn

1098-1136

journal_volume

54

pub_type

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