title: Seselin from Plumbago zeylanica inhibits phytohemagglutinin (PHA)-stimulated cell proliferation in human peripheral blood mononuclear cells.
abstract: Effects of seselin (C(14)H(12)O(3); MW 228) identified from Plumbago zeylanica on phytohemagglutinin (PHA)-stimulated cell proliferation were studied in human peripheral blood mononuclear cells (PBMC). The data demonstrated that seselin inhibited PBMC proliferation-activated with PHA with an IC(50) of 53.87+/-0.74 microM. Cell viability test indicated that inhibitory effects of seselin on PBMC proliferation were not through direct cytotoxicity. The action mechanisms of seselin may involve the regulation of cell cycle progression, interleukin-2 (IL-2) and interferon-gamma (IFN-gamma) production in PBMC. Since cell cycle analysis indicated that seselin arrested the cell cycle progression of activated PBMC from the G(1) transition to the S phase. Seselin suppressed IL-2 and IFN-gamma production in a concentration-dependent manner. Furthermore, seselin significantly decreased the IL-2 and IFN-gamma gene expression in PHA-activated PBMC. Therefore, results elucidated for the first time that seselin is likely an immunomodulatory agent for PBMC.
authors.affiliation: National Research Institute of Chinese Medicine, No. 155-1, Sec. 2, Li-Nung Street, Shih-Pai, 112, Taipei, Taiwan.
authors.forename: W J
authors.initials: WJ
authors.lastname: Tsai
authors.forename: Y C
authors.initials: YC
authors.lastname: Chen
authors.forename: M H
authors.initials: MH
authors.lastname: Wu
authors.forename: L C
authors.initials: LC
authors.lastname: Lin
authors.forename: K A
authors.initials: KA
authors.lastname: Chuang
authors.forename: S C
authors.initials: SC
authors.lastname: Chang
authors.forename: Y C
authors.initials: YC
authors.lastname: Kuo
mesh_terms: D000328:Adult; D002453:Cell Cycle / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects*; D002470:Cell Survival / Q000187:drug effects; D003374:Coumarins / Q000008:administration & dosage / Q000302:isolation & purification / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D005786:Gene Expression Regulation / Q000187:drug effects; D006801:Humans; D007155:Immunologic Factors / Q000008:administration & dosage / Q000302:isolation & purification / Q000494:pharmacology*; D020128:Inhibitory Concentration 50; D007371:Interferon-gamma / Q000187:drug effects / Q000378:metabolism; D007376:Interleukin-2 / Q000378:metabolism; D007963:Leukocytes, Mononuclear / Q000187:drug effects; D008297:Male; D010835:Phytohemagglutinins / Q000494:pharmacology; D010936:Plant Extracts / Q000494:pharmacology; D029606:Plumbaginaceae / Q000737:chemistry*; D055815:Young Adult
chemical_list: D003374:Coumarins; D007155:Immunologic Factors; D007376:Interleukin-2; D010835:Phytohemagglutinins; D010936:Plant Extracts; C516746:seselin; D007371:Interferon-gamma