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LPS-induced down-regulation of NO-sensitive guanylyl cyclase in astrocytes occurs by proteasomal degradation in nuclear bodies

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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.
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.
dc.description This work was supported by a SAF2004-01717 grant (Spain).
dc.description Peer reviewed
dc.format 151184 bytes
dc.format application/pdf
dc.language eng
dc.publisher BioMed Central
dc.relation Publisher’s version
dc.rights openAccess
dc.title LPS-induced down-regulation of NO-sensitive guanylyl cyclase in astrocytes occurs by proteasomal degradation in nuclear bodies
dc.type Artículo

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