STAT3/NF-κB interactions determine the level of haptoglobin expression in male rats exposed to dietary restriction and/or acute phase stimuli
2012
Authors:
Uskoković, AleksandraDinić, Svetlana
Mihailović, Mirjana
Grdović, Nevena
Arambašić Jovanović, Jelena
Vidaković, Melita
Bogojević, Desanka
Ivanović Matić, Svetlana
Martinović, Vesna
Petrović, Miodrag
Poznanović, Goran
Grigorov, Ilijana
Document Type:
Article (Published version)
,
© 2011 Springer Science+Business Media B.V.
Metadata
Show full item recordAbstract:
Haptoglobin is a constitutively expressed protein which is predominantly synthesized in the liver. During the acute-phase (AP) response haptoglobin is upregulated along with other AP proteins. Its upregulation during the AP response is mediated by cis-trans interactions between the hormone-responsive element (HRE) residing in the haptoglobin gene and inducible transcription factors STAT3 and C/EBP beta. In male rats that have been subjected to chronic 50% dietary restriction (DR), the basal haptoglobin serum level is decreased. The aim of this study was to characterize the trans-acting factor(s) responsible for the reduction of haptoglobin expression in male rats subjected to 50% DR for 6 weeks. Protein-DNA interactions between C/EBP and STAT families of transcription factors and the HRE region of the haptoglobin gene were examined in livers of male rats subjected to DR, as well as during the AP response that was induced by turpentine administration. In DR rats, we observed associations between the HRE and C/EBPalpha/beta, STAT5b and NF-kappaB p50, and the absence of interactions between STAT3 and NF-kB p65. Subsequent induction of the AP response in DR rats by turpentine administration elicited a normal, almost 2-fold increase in the serum haptoglobin level that was accompanied by HRE-binding of C/EBPbeta, STAT3/5b and NF-kB p65/p50, and the establishment of interaction between STAT3 and NF-kappaB p65. These results suggest that STAT3 and NF-kappaB p65 crosstalk plays a central role while C/EBPbeta acquires an accessory role in establishing the level of haptoglobin gene expression in male rats exposed to DR and AP stimuli.
Keywords:
Acute inflammation; Attenuated haptoglobin expression; C/EBPs; Dietary restriction; NF-κB; STATsSource:
Molecular Biology Reports, 2012, 39, 1, 167-176Funding / projects:
- Signaling molecules in diabetes: search for potential targets in intrinsic pathways for prediction and intervention in diabetes (RS-MESTD-Basic Research (BR or ON)-173020)
DOI: 10.1007/s11033-011-0722-5
ISSN: 0301-4851
PubMed: 21556775
WoS: 000297355700021
Scopus: 2-s2.0-84855192286
URI
http://link.springer.com/10.1007/s11033-011-0722-5https://radar.ibiss.bg.ac.rs/handle/123456789/3199