Modulation of the inflammatory process and interaction of THP-1 monocytes with intestinal epithelial cells by glasswort (Salicornia herbacea L.) extracts

摘要

The glasswort is an edible halophyte demonstrating various physiological effects including anti-inflammatory activity. In the present study, the effects of glasswort extracts on inflammatory events and interactions of THP-I monocytes with intestinal epithelial cells were investigated. Five solvent fractions, including the ethylether fraction (Fr.E), were prepared from a 70% methanol extract of glasswort. THP-1 monocytes underwent differentiation by phorbol 12-myristate 13-acetate treatment and were then activated by lipopolysaccharide (LPS), which induced cyclooxygenase (COX)-2 expression. None of the glasswort fractions tested alone induced COX-2 in differentiated THP-1 cells. Fr.E, however, enhanced LPS-induced COX-2 expression in differentiated THP-1 cells. Culture media of THP-1 cells treated with each fraction stimulated the growth of normal intestinal INT-407 cells more prominently than that of HT-29 colon cancer cells. COX-2 expression in HT-29 cells was inhibited when the cells were exposedto the THP-1 culture medium treated with Fr.E. Thus, glasswort could modulate the interaction between immune cells and intestinal cells.