Yonago Acta medica 2004;47:7–15
Regulation of TNF-α, IL-1β and ICAM-1 Gene Expression in THP-1 Monocytes Stimulated with Plasmodium falciparum-Cultured Medium by Excretory/Secretory Products from Spirometra erinaceieuropaei Plerocercoids
Paramasari Dirgahayu, Soji Fukumoto, Sayuri Tademoto and Kazumitsu Hirai
Division of Molecular Medical Zoology, Department of Microbiology and Pathology, School of Medicine, Tottori University Faculty of Medicine, Yonago 683-8503 Japan
We have reported that excretory/secretory (ES) products from Spirometra erinaceieuropaei plerocercoids suppress production and gene expression of tumor necrosis factor (TNF)-α in murine macrophages stimulated with lipopolysaccharide. The present study demonstrates that ES products suppress TNF-α, interleukin (IL)-1β and intercellular adhesion molecule (ICAM)-1 gene expression in human monocytic leukemia cell line THP-1 stimulated with Plasmodium falciparum-cultured medium (Pf-CM). Inhibition of extracellular-signal regulated protein kinase 1/2 (ERK1/2) with PD98059 reduced TNF-α, IL-1β and ICAM-1 gene expression; on the contrary inhibition of p38 mitogen-activated protein kinase (MAPK) with SB203580 increased the expression of these genes. These findings indicated that ERK1/2, but not p38 MAPK pathway is important for induction of TNF-α, IL-1β and ICAM-1 gene expression in Pf-CM stimulated THP-1 monocytes. ES products additionally suppress IL-1β, but not TNF-α and ICAM-1 gene expression in Pf-CM stimulated THP-1 cells treated with PD98059. We hypothesize that ES products may be useful in reducing falciparum malaria-induced inflammatory response and sequestration in the late stage of malarial diseases such as cerebral malaria.
Key words: human monocytes; mitogen-activated protein kinase; Plasmodium falciparum; Spirometra erinaceieuropaei; tumor necrosis factor-α
