title: [Expression and role of toll-like receptors in U937 cells].
abstract: The aim of study was to explore the potential application of targeting at Toll-like receptors (TLRs) in the immunotherapy of acute myelocytic leukemia, and to investigate the expression of TLR and the effects of TLR 8 agonist ssRNA40/LyoVec on proliferation, apoptosis and cell cycle of U937 cells. The expression of TLR 1 - 9 in U937 cells was detected by using reverse transcription polymerase chain reaction (RT-PCR) and the expression of TLR 8 was assayed by flow cytometry (FCM). The effect of TLR 8 agonist, ssRNA40/LyoVec, at different concentrations on U937 cells proliferation was evaluated by CCK-8, apoptosis and cell cycle were detected by FCM. The results showed that U937 cells expressed TLR 1 - 9. TLR 8 agonist ssRNA40/LyoVec could inhibit the growth of U937 cells both in time-and dose-dependent manner and the inhibitory rate could reach 70%. It also increased the percentage of cells in G(0)/G(1) phase. There was no significant difference in percentage of apoptotic cells between control and treated groups. It is concluded that TLRs including TLR 1 - 9 express on U937 cells and TLR 8 agonist ssRNA40/LyoVec may be able to inhibit the growth of U937 cells, arrest the cells in G(0)/G(1) phase, but have no effect of promoting apoptosis.
authors.affiliation: Stem Cell Research Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China.
authors.forename: Fang
authors.initials: F
authors.lastname: Xiong
authors.forename: Xing-Bing
authors.initials: XB
authors.lastname: Wang
authors.forename: Jia-Hua
authors.initials: JH
authors.lastname: Zhang
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.forename: Si
authors.initials: S
authors.lastname: Sun
authors.forename: Li-Qiong
authors.initials: LQ
authors.lastname: Liu
authors.forename: Ping
authors.initials: P
authors.lastname: Wang
authors.forename: Shi-Ang
authors.initials: SA
authors.lastname: Huang
mesh_terms: D017209:Apoptosis / Q000187:drug effects; D002453:Cell Cycle / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D006801:Humans; D015470:Leukemia, Myeloid, Acute / Q000378:metabolism* / Q000473:pathology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D051200:Toll-Like Receptor 8 / Q000819:agonists*; D051193:Toll-Like Receptors / Q000378:metabolism*; D020298:U937 Cells
chemical_list: D051200:Toll-Like Receptor 8; D051193:Toll-Like Receptors