Glial cells promote dendrite formation and the reception of synaptic input in Purkinje cells from postnatal mice.

Abstract:

:Previous studies suggest that glial cells contribute to synaptogenesis in specific neurons from the postnatal CNS. Here, we studied whether this is true for Purkinje cells (PCs), which represent a unique neuronal cell type due to their large size, massive synaptic input, and high vulnerability. Using new glia-free cultures enriched in PCs from postnatal mice we show that these neurons survived and grew, but displayed only low levels of excitatory and inhibitory synaptic activity. Coculture with glial cells strongly enhanced the frequency and size of spontaneous and miniature excitatory synaptic currents as well as neurite growth and branching. Immunocytochemical staining for microtubule-associated protein 2- (MAP2-) positive neurites revealed impaired dendrite formation in PCs under glia-free conditions, which can explain the absence of synaptic activity. Glial signals strongly enhanced dendritogenesis in PCs and thus their ability to receive excitatory synaptic input from granule cells (GCs). The enhancement of dendrite formation was mimicked by glia-conditioned medium (GCM), whereas the increase in synaptic activity required physical presence of glia. This indicated that dendrite development is necessary but not sufficient for PCs to receive excitatory synaptic input and that synaptogenesis requires additional signals. The level of inhibitory synaptic activity was low even in cocultures due to a low incidence of inhibitory interneurons. Taken together, our results reinforce the idea that glial cells promote synaptogenesis in specific neuronal cell types.

journal_name

Glia

journal_title

Glia

authors

Buard I,Steinmetz CC,Claudepierre T,Pfrieger FW

doi

10.1002/glia.20943

subject

Has Abstract

pub_date

2010-04-01 00:00:00

pages

538-45

issue

5

eissn

0894-1491

issn

1098-1136

journal_volume

58

pub_type

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