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Inhibition of serotonin transporter expression by C/EBPβ in LPS-activated macrophage cells (HD11).
MedLine Citation:
PMID:  25213348     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Serotonin (5-hydroxytryptamine; 5-HT) transporter (5-HTT) is involved in inflammation and the stress response. In this study, we examined the regulation of 5-HTT expression in macrophage HD11 cells in response to bacterial LPS. Long-term exposure of cells to LPS (6-18 h) produced a decrease in 5-HTT mRNA expression. Accordingly, reduced 5-HTT activity measured by 5-HT uptake was also observed in LPS-treated HD11 cells. Moreover, LPS treatment, as well as co-transfection with an expression vector encoding the chicken CCAAT/enhancer binding protein beta (C/EBPβ), resulted in inhibition of 5-HTT promoter activity. Indeed, sequence analysis revealed several C/EBPβ binding motifs in the upstream region of the 5-HTT gene, which specifically interacted with C/EBPβ both in an in vitro band shift assay and in living HD11 cells. The C/EBPβ binding was activated in cells treated with LPS. The role of C/EBPβ in LPS inhibition of 5-HTT expression was further confirmed by small interfering RNA interference, which demonstrated that knockdown of endogenous C/EBPβ attenuated the inhibition of 5-HTT expression in LPS-treated cells. Taken together, the results suggest that C/EBPβ plays a critical role in regulating the 5-HTT gene in macrophages in response to pro-inflammatory stimuli.
Authors:
Katrin Zimmermann; Valerie D van Phi; Angela Brase; Loc Phi-van
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-9-11
Journal Detail:
Title:  Innate immunity     Volume:  -     ISSN:  1753-4267     ISO Abbreviation:  Innate Immun     Publication Date:  2014 Sep 
Date Detail:
Created Date:  2014-9-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101469670     Medline TA:  Innate Immun     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© The Author(s) 2014 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav.
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