Abstract
Zymosan is a yeast cell wall particle that activates several cell lines, especially macrophages, resulting in the stimulated secretion of inflammatory products including tumor necrosis factor alpha (TNF-α) and arachidonic acid. Cyclooxygenase-2 (COX-2) is an immediate early gene induced by several stimuli in macrophages. The following research aimed to investigate the regions of COX-2 promoter gene that mediate the inductive effects of zymosan. Transient transfections with a series of COX-2 promoter–mutation constructs were performed to further elucidate the effects of zymosan on COX-2 transcription. Exposure to zymosan (50 μg/mL for 24 h) markedly enhanced the relative luciferase activity in RAW 264.7 macrophages (mouse leukemic monocyte macrophage cell line) transfected with COX-2 luciferase promoter constructs. Deletion on the CCAAT-enhancer binding protein (C/EBP) and nuclear factor kappa B (NF-kappa B) binding site resulted in an important decrease in reporter gene activity and a deletion of NF-kappa B and C/EBP with mutation of the cyclic adenosine monophosphate response element (CRE) and/or activator protein-1 totally abolished the reporter gene activity induced by zymosan. These findings provide further insight into the signal transduction pathways involved in COX-2 gene activated by zymosan in macrophages.
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Acknowledgments
This study was supported by grants from CAPES/DGU (BEX 4422/09-0)—Brazil, IDIBELL (Institut d'Investigació Biomèdica de Bellvitge) and Secretaría de Estado de Universidades, Ministerio de Ciencia e Innovación (PHB2008-0080-PC)—Spain.
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Santos, R.C.V., Rico, M.A.P., Bartrons, R. et al. The Transcriptional Activation of the Cyclooxygenase-2 Gene in Zymosan-Activated Macrophages is Dependent on NF-Kappa B, C/EBP, AP-1, and CRE Sites. Inflammation 34, 653–658 (2011). https://doi.org/10.1007/s10753-010-9275-3
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DOI: https://doi.org/10.1007/s10753-010-9275-3