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http://dx.doi.org/10.5352/JLS.2006.16.3.500

Inflammatory Regulation by Haptoglobin in A549 Cells  

Kim Nam-Hoon (Department of Natural Science, Chemistry Section, College of Medicine, The Catholic University of Korea)
Lee Myung-Jae (Department of Natural Science, Chemistry Section, College of Medicine, The Catholic University of Korea)
Kim In-Sook (Department of Natural Science, Chemistry Section, College of Medicine, The Catholic University of Korea)
Publication Information
Journal of Life Science / v.16, no.3, 2006 , pp. 500-504 More about this Journal
Abstract
Haptoglobin (Hp) is an acute phase protein, and its plasma level increases consistently in response to inflammation. To investigate the biological role of Hp in lung epithelial cells, the gene expressions of cyclooxygenase-2 (COX-2) and inflammatory cytokines were analyzed using human Hp gene-transfected A549 cells. Western blot analysis showed that COX-2 expression was markedly increased in Hp DNA-transfected cells (stable transfection and transient transfection) compared with that in vehicle DNA-transfected cells. When the Hp-expressing cells were treated with $1{\mu}g/ml$ of LPS or 100 U/ml of $IL-1{\beta}$ for 24 hr, the COX-2 expression was synergistically up-regulated. ACP-based PCR data demonstrated the Hp decreased SPARC expression, but increased IL-4 and S100AI expressions. These findings suggest that the Hp acts as a pro-inflammatory mediator in lung inflammation.
Keywords
Haptoglobin; cyclooxygenase-2; SPARC; IL-4; A549 cell line;
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