title: Shikonin Suppresses Human T Lymphocyte Activation through Inhibition of IKK β Activity and JNK Phosphorylation.
abstract: The key role of T cells has been elaborated in mediating immune responses and pathogenesis of human inflammatory and autoimmune conditions. In the current study the effect of shikonin, a compound isolated from a medicinal plant, on inhibition of T-cell activation was firstly examined by using primary human T lymphocytes isolated from buffy coat. Results showed that shikonin dose dependently suppressed T-cell proliferation, IL-2 and IFN- γ secretion, CD69 and CD25 expression, as well as cell cycle arrest activated by costimulation of PMA/ionomycin or OKT-3/CD28 monoclonal antibodies. Moreover, these inhibitory responses mediated by shikonin were found to be associated with suppression of the NF- κ B signaling pathway via inhibition of the IKK α / β phosphorylation, I κ B- α phosphorylation and degradation, and NF- κ B nuclear translocation by directly decreasing IKK β activity. Moreover, shikonin suppressed JNK phosphorylation in the MAPKs pathway of T cells. In this connection, we conclude that shikonin could suppress T lymphocyte activation through suppressing IKK β activity and JNK signaling, which suggests that shikonin is valuable for further investigation as a potential immunosuppressive agent.
authors.affiliation: State Key Laboratory of Quality Research in Chinese Medicine, Macau Institute for Applied Research in Medicine and Health, Macau University of Science and Technology, Avenida Wai Long, Taipa, Macau.
authors.forename: Ting
authors.initials: T
authors.lastname: Li
authors.forename: Fenggen
authors.initials: F
authors.lastname: Yan
authors.forename: Rui
authors.initials: R
authors.lastname: Wang
authors.forename: Hua
authors.initials: H
authors.lastname: Zhou
authors.forename: Liang
authors.initials: L
authors.lastname: Liu