ATP and adenosine induce ramification of microglia in vitro.

Abstract:

:Microglial cells in the healthy adult brain possess a characteristic ramified morphology with multiple branched processes, small somata and down-regulated inflammatory properties. In contrast, microglial cells isolated from new-born rat brain inevitably show a non-ramified amoeboid phenotype, which is observed in vivo after pathologic activation or during development. To identify factors that control microglial morphology we investigated the effects of purines alone or in combination with astrocyte-conditioned medium (ACM). Under optimized culture conditions postnatal rat microglial cells developed an amoeboid to ovoid phenotype. Addition of 0.6-1 mM ATP or adenosine induced the outgrowth of numerous processes after 2-3 days that could be observed also in the presence of ACM as previously reported. Culture in ACM plus ATP or adenosine yielded an optimized ramified phenotype. ATP or adenosine, but not ACM alone, also prevented the formation of a flat, amoeboid morphology induced by lipopolysaccharide (LPS); however, at 0.6-1 mM they did not reduce the initial LPS-induced activation of the transcription factor NF-kappaB. By using specific agonists or antagonists the morphological transformations could not be confined to a distinct purinoreceptor subtype, but appeared to be mediated by long-term presence of adenosine in the medium to which phosphorylated purines were rapidly hydrolyzed by microglial cells. Since ACM did not contain sufficient concentrations of ATP or adenosine, purines are not the only ramification-inducing factors present in ACM; however, they are a valuable tool to induce microglial ramification in vitro.

journal_name

J Neuroimmunol

authors

Wollmer MA,Lucius R,Wilms H,Held-Feindt J,Sievers J,Mentlein R

doi

10.1016/s0165-5728(01)00257-0

subject

Has Abstract

pub_date

2001-04-02 00:00:00

pages

19-27

issue

1-2

eissn

0165-5728

issn

1872-8421

pii

S0165572801002570

journal_volume

115

pub_type

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