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Journal of Neuroinflammation
Published in: Journal of Neuroinflammation 1/2013

Open Access 01-12-2013 | Research

Different actions of endothelin-1 on chemokine production in rat cultured astrocytes: reduction of CX3CL1/fractalkine and an increase in CCL2/MCP-1 and CXCL1/CINC-1

Authors: Yutaka Koyama, Mao Kotani, Tadateru Sawamura, Miho Kuribayashi, Rika Konishi, Shotaro Michinaga

Published in: Journal of Neuroinflammation | Issue 1/2013

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Abstract

Background

Chemokines are involved in many pathological responses of the brain. Astrocytes produce various chemokines in brain disorders, but little is known about the factors that regulate astrocytic chemokine production. Endothelins (ETs) have been shown to regulate astrocytic functions through ETB receptors. In this study, the effects of ETs on chemokine production were examined in rat cerebral cultured astrocytes.

Methods

Astrocytes were prepared from the cerebra of one- to two-day-old Wistar rats and cultured in serum-containing medium. After serum-starvation for 48 hours, astrocytes were treated with ETs. Total RNA was extracted using an acid-phenol method and expression of chemokine mRNAs was determined by quantitative RT-PCR. The release of chemokines was measured by ELISA.

Results

Treatment of cultured astrocytes with ET-1 and Ala1,3,11,15-ET-1, an ETB agonist, increased mRNA levels of CCL2/MCP1 and CXCL1/CINC-1. In contrast, CX3CL1/fractalkine mRNA expression decreased in the presence of ET-1 and Ala1,3,11,15-ET-1. The effect of ET-1 on chemokine mRNA expression was inhibited by BQ788, an ETB antagonist. ET-1 increased CCL2 and CXCL1 release from cultured astrocytes, but decreased that of CX3CL1. The increase in CCL2 and CXCL1 expression by ET-1 was inhibited by actinomycin D, pyrrolidine dithiocarbamate, SN50, mithramycin, SB203580 and SP600125. The decrease in CX3CL1 expression by ET-1 was inhibited by cycloheximide, Ca2+ chelation and staurosporine.

Conclusion

These findings suggest that ETs are one of the factors regulating astrocytic chemokine production. Astrocyte-derived chemokines are involved in pathophysiological responses of neurons and microglia. Therefore, the ET-induced alterations of astrocytic chemokine production are of pathophysiological significance in damaged brains.
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Metadata
Title
Different actions of endothelin-1 on chemokine production in rat cultured astrocytes: reduction of CX3CL1/fractalkine and an increase in CCL2/MCP-1 and CXCL1/CINC-1
Authors
Yutaka Koyama
Mao Kotani
Tadateru Sawamura
Miho Kuribayashi
Rika Konishi
Shotaro Michinaga
Publication date
01-12-2013
Publisher
BioMed Central
Published in
Journal of Neuroinflammation / Issue 1/2013
Electronic ISSN: 1742-2094
DOI
https://doi.org/10.1186/1742-2094-10-51

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