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Study on Immunosuppressive Effects of Rosa Chinensis Jacq. Extract  

Kim, Kyoung-Shin (Department of Physiology, Colleage of Oriental Medicine, Daejeon University)
Park, Jae-Won (Department of Physiology, Colleage of Oriental Medicine, Daejeon University)
Chae, Suhn-Kee (Department of Life Science and Technology, Paichai Univetsity)
Kang, Jung-Soo (Department of Physiology, Colleage of Oriental Medicine, Daejeon University)
Kim, Byoung-Soo (Department of Physiology, Colleage of Oriental Medicine, Daejeon University)
Publication Information
Journal of Physiology & Pathology in Korean Medicine / v.25, no.3, 2011 , pp. 459-465 More about this Journal
Abstract
The nuclear factor of activated T cells (NFAT) protein induces transcriptions of cytokine genes including IL-2 for T-cell activation. Normally activation of NFAT is important to induce immune responses but excessive NFAT activation provokes immunopathological reactions such as autoimmunity, transplant rejection, and inflammation. Thus, for the treatment of autoimmune diseases drugs repressing the activation of NFAT have been searched. In this study, immnunosuppressive effects of Rosa chinensis Jacq. extracts identified as a potent NFAT inhibitor from a natural product library were examined. NFAT reporter assay, MTS assay, real time PCR, IL-2 ELISA, MLR, and FACS (Fluorescent Activated Cell Sorting) were used to measure inhibitory immunocyte activities of Rosa chinensis Jacq. The variety of natural products have been screened and some were found to show inhibitory activities against the NFAT transcription factor. Among them, extract of Rosa chinensis Jacq. showed an strong inhibitory effect on the activation of NFAT without affecting cell viability. Levels of IL-2 transcripts as well as IL-2 protein were decreased with treatment of Rosa chinensis Jacq. extract. In addition, immunosuppressive activity of Rosa chinensis Jacq. extract was exhibited in the mixed leukocytes reaction. The increasement of CD4+CD25+ (Treg) immunocyte was also detected in the analysis using FACS after applying Rosa chinensis Jacq. extract. Immunosuppressive effects of the Rosa chinensis Jacq. extracts were clearly demonstrated in the present study. In addition, Rosa chinensis Jacq. extract also positively affected regulatory T cell induction. Further investigations in particular on purification of single substance responsible for the immunosuppressive effects from the extract and analysis on possible actions of the extract in interfering cell signaling and cytokine production will be needed.
Keywords
Nuclear Factor of Activated T cells (NFAT); Interleukin-2 (IL-2); Regulatory T cells (Treg cells); Rosa chinensis Jacq. (月季花);
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