title: Platonin modulates differentiation and maturation of human monocyte-derived dendritic cells.
abstract: Platonin is a photosensitizer with NF-kappaB inhibitory activity that activates macrophages and suppresses lymphocyte response. In this study, we tested the effect of platonin on differentiation and maturation of human myeloid dendritic cells (DC) from CD14+ monocytes. Triggering of DC differentiation by GM-CSF and IL-4 resulted in typical immature DCs that were further stimulated to maturation by combination of cytokines. When platonin (2 to 50 ng/mL) was added to the culture, the resulting DCs had thicker and blunter protruding projections, lower CD83 expression, greater CD80 expression, and less stimulatory activity on allogeneic naive CD4+CD45RA+ T cells in terms of their proliferation and interferon-gamma production. This suggests that platonin redirects DC differentiation toward an intermediate stage of maturation, whereby the DCs have uniquely enhanced expression of CD80 which may confer some degree of immune tolerance.
authors.affiliation: Division of General Surgery, Department of Surgery, Mackay Memorial Hospital, Taipei, 104 Taiwan.
authors.forename: Jie-Jen
authors.initials: JJ
authors.lastname: Lee
authors.forename: Hui-Fen
authors.initials: HF
authors.lastname: Liao
authors.forename: Yuh-Cheng
authors.initials: YC
authors.lastname: Yang
authors.forename: Chien-Liang
authors.initials: CL
authors.lastname: Liu
authors.forename: Yu-Yawn
authors.initials: YY
authors.lastname: Chen
authors.forename: Chin-Ping
authors.initials: CP
authors.lastname: Lin
authors.forename: Yu-Jen
authors.initials: YJ
authors.lastname: Chen
mesh_terms: D002452:Cell Count; D002454:Cell Differentiation / Q000187:drug effects; D016207:Cytokines / Q000096:biosynthesis; D003713:Dendritic Cells / Q000187:drug effects / Q000502:physiology* / Q000648:ultrastructure; D005434:Flow Cytometry; D006801:Humans; D066298:In Vitro Techniques; D018664:Interleukin-12 / Q000096:biosynthesis; D009000:Monocytes / Q000187:drug effects / Q000502:physiology* / Q000648:ultrastructure; D016328:NF-kappa B / Q000037:antagonists & inhibitors / Q000187:drug effects; D010641:Phenotype; D017319:Photosensitizing Agents / Q000494:pharmacology*; D013601:T-Lymphocytes / Q000187:drug effects / Q000378:metabolism; D013844:Thiazoles / Q000494:pharmacology*
chemical_list: D016207:Cytokines; D016328:NF-kappa B; D017319:Photosensitizing Agents; D013844:Thiazoles; C032149:platonin; D018664:Interleukin-12