|
KMID : 0043320070300091102
|
|
Archives of Pharmacal Research
2007 Volume.30 No. 9 p.1102 ~ p.1110
|
|
|
Establishment of an In Vitro Test System to Evaluate the Down-Regulatory Activities of Natural Products on IL-4
|
|
Choi Jeong-June
Park Bo-Kyung
Song Gyu-Yong
Kim Jin-Sook
Kim Joo-Hwan
Kim Dong-Hee
|
|
|
Abstract
|
|
|
|
Interleukin-4 (IL-4), a representative TH2 cytokine, plays a pathologic role in the onset of various allergic diseases including atopic dermatitis, atopic rhinitis, and asthma. Several drug candidates that down-regulate IL-4 expression have been studied for their possible use as antiallergic agents in clinical settings. Therefore, an in vitro test to evaluate IL-4 promoter activities might be useful for selecting candidates of novel natural therapeutics. The promoter region (- 741 to +56) of IL-4 was cloned upstream of a luciferase gene in the plasmid pGL4.14 with a hygromycin resistance gene as a selection marker to generate pGL4.14-IL-4. Treatment with PMA and A23187 highly increased luciferase activity by approximately 10-fold compared with the control in both EL-4 thymoma and RBL-2H3 cells transiently transfected with pGL4.14-IL-4, as well as in stable cell lines constantly expressing pGL4.14-IL-4. Cyclosporin A and dexamethasone, well-known anti-allergic agents, significantly down-regulated the activity in a dosedependent manner. The feasibility of this system was evaluated by measuring the down-regulatory activities of various extracts from the TBRC plant library on PMA- and A23187-induced luciferase activities of IL-4 promoter, and by measuring IL-4 production in cultured cells using ELISA assays. The results of this study suggest that this primary screening system is simple and time-saving, and might be suitable for the selection of natural therapeutic candidates for allergic disease by measuring the down-regulatory effects of natural products on the IL-4 promoter
|
|
|
KEYWORD
|
|
|
IL-4, pGL4, 4-IL-4 Expressing stable cell lines, Luciferase assay, Natural therapeutic candidates for allergic disease
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
  
|
|