| dc.creator |
Berciano, María T. |
|
| dc.creator |
Baltrons, María Antonia |
|
| dc.creator |
Pifarré, Paula |
|
| dc.creator |
Lafarga, Miguel |
|
| dc.creator |
García, Agustina |
|
| dc.date |
2008-06-20T10:07:20Z |
|
| dc.date |
2008-06-20T10:07:20Z |
|
| dc.date |
2007-07-25 |
|
| dc.date.accessioned |
2017-01-31T01:44:50Z |
|
| dc.date.available |
2017-01-31T01:44:50Z |
|
| dc.identifier |
BMC Pharmacology 2007, 7(Suppl 1):P3 |
|
| dc.identifier |
1471-2210 |
|
| dc.identifier |
http://hdl.handle.net/10261/5211 |
|
| dc.identifier |
10.1186/1471-2210-7-S1-P3 |
|
| dc.identifier.uri |
http://dspace.mediu.edu.my:8181/xmlui/handle/10261/5211 |
|
| dc.description |
From 3rd International Conference on cGMP Generators, Effectors and Therapeutic Implications.-- This abstract is available from: http://www.biomedcentral.com/1471-2210/7/S1/P3 |
|
| dc.description |
[Background] We have previously shown that inflammatory agents (LPS, IL-1β, β-amyloid peptides) that induce reactivity and NOS-2 expression in glial cells down-regulate astroglial soluble guanylyl cyclase (sGC) in vitro and in vivo. |
|
| dc.description |
[Results] Here we show that the decrease in sGC activity and β1 subunit protein induced by LPS (10 ng/ml, 24 h) in cultured rat cerebellar astrocytes is prevented by inhibitors of proteasome activity (MG132 5 μM; lactacystin 10 μM) whereas other protease inhibitors (calpain inhibitor 25 μM; ICE inhibitor II 100 μM and leupeptin 5 μM) were not effective. Furthermore, immunocytochemistry and confocal laser microscopy revealed that in LPS-treated cells a strong sGC β1 immunorreactivity is evident in aggregates in the cell nuclei where it co-localizes with 20S proteasomes and ubiquitin in clastosomes, nucleoplasmic substructures involved in ubiquitin-proteasome-dependent nuclear proteolysis, but do not colocalize with others proteasome-enriched structures include promyelocytic leukaemia bodies and splicing speckles. In contrast, in untreated astrocytes clastosomes are scarce and sGC β1 immunorectivity shows a diffuse cytoplasmic pattern, while in the nucleus it is very weak. A similar distribution is observed when cells are treated with LPS and the proteasome inhibitor MG132 or the protein synthesis inhibitor cycloheximide. |
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| dc.description |
[Conclusion] LPS orchestrates the recruitment of sGC-β1 protein and components of the ubiquitin-proteasome system to specialized nuclear bodies, clastosomes, suggesting a mechanism for inflammation-induced down-regulation of sGC in astrocytes. |
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| dc.description |
This work was supported by a SAF2004-01717 grant (Spain). |
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| dc.description |
Peer reviewed |
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| dc.format |
151184 bytes |
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| dc.format |
application/pdf |
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| dc.language |
eng |
|
| dc.publisher |
BioMed Central |
|
| dc.relation |
Publisher’s version |
|
| dc.rights |
openAccess |
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| dc.title |
LPS-induced down-regulation of NO-sensitive guanylyl cyclase in astrocytes occurs by proteasomal degradation in nuclear bodies |
|
| dc.type |
Artículo |
|