dc.creator | Arambašić Jovanović, Jelena | |
dc.creator | Poznanović, Goran | |
dc.creator | Ivanović-Matić, Svetlana | |
dc.creator | Bogojević, Desanka | |
dc.creator | Mihailović, Mirjana | |
dc.creator | Uskoković, Aleksandra | |
dc.creator | Grigorov, Ilijana | |
dc.date.accessioned | 2023-10-03T11:49:22Z | |
dc.date.available | 2900-01-01 | |
dc.date.issued | 2010 | |
dc.identifier.issn | 1521-6543 | |
dc.identifier.uri | http://radar.ibiss.bg.ac.rs/handle/123456789/6148 | |
dc.description.abstract | Upregulation of haptoglobin (Hp) expression in the rat during the acute phase (AP) response is the result of synergistic effects of IL-6–, IL-1β–, and corticosterone-activated signaling pathways. IL-6 signaling terminates in cis–trans interactions of the Hp gene hormone-responsive element (HRE) with transcription factors STAT3 and C/EBPβ. The aim of this study was to examine the unresolved molecular mechanism of glucocorticoid action. A 3-fold rise in serum corticosterone at 2 and 4 h of the AP response induced by turpentine administration preceded a 2.3-fold increase in the rate of Hp gene transcription at 12 h that was accompanied by a 4.8-fold increase in glucocorticoid receptor (GR), the appearance of an 86-kDa STAT3 isoform and 3.9-, 1.9-, and 1.7-fold increased amounts of 91-kDa STAT3, 35- and 42-kDa C/EBPβ isoforms in the nucleus. These events resulted in 4.6- and 2.5-fold increased Hp levels in the liver and serum at 24 h. HRE affinity chromatography and immunoblot analysis revealed that maximal occupancy of the HRE with GR, STAT3, and C/EBPβ at 12 h correlated with increased transcriptional activity of the Hp gene. Coimmunoprecipitation experiments showed that activated GR established de novo interaction with STAT3 isoforms while GR–C/EBPβ interactions observed during basal transcription increased during the AP response. Computer analysis of the HRE disclosed two potential GR-binding sites: one overlapping STAT3, another adjacent to a C/EBPβ-binding site. This finding and the experimental results suggest that activated GR through direct interactions with STAT3 and C/EBPβ, participates in Hp gene upregulation as a transcriptional coactivator. | |
dc.publisher | Wiley | en |
dc.rights | restrictedAccess | |
dc.source | IUBMB Life | en |
dc.title | Association of the glucocorticoid receptor with STAT3, C/EBPβ, and the hormone-responsive element within the rat haptoglobin gene promoter during the acute phase response | en |
dc.type | article | en |
dc.rights.license | ARR | |
dc.rights.holder | © 2010 International Union of Biochemistry and Molecular Biology, Inc. | |
dc.citation.issue | 3 | |
dc.citation.volume | 62 | |
dc.identifier.doi | 10.1002/iub.313 | |
dc.identifier.pmid | 20155810 | |
dc.identifier.scopus | 2-s2.0-77951133663 | |
dc.identifier.wos | 000276585200010 | |
dc.citation.spage | 227 | |
dc.citation.epage | 236 | |
dc.type.version | publishedVersion | |
dc.citation.rank | M21 | |