title: Salsolinol Damaged Neuroblastoma SH-SY5Y Cells Induce Proliferation of Human Monocyte THP-1 Cells Through the mTOR Pathway in a Co-culture System.
abstract: Despite extensive efforts to study the inflammatory process in the central nervous system of Parkinson's disease (PD) patients, little is known about the role of peripheral blood mononuclear cells (PBMCs) in PD. In the present study, we used an in vitro co-culture system to study the role of the human monocyte cell line THP-1 in medium conditioned by the neuroblastoma cell line SH-SY5Y damaged with the endogenous neurotoxin 1-methyl-4-phenyl-1,2,3,4-tetrahydroisoquinoline (Salsolinol, Sal) in co-culture with the human glioma cell line U87. For this purpose, SH-SY5Y and U87 co-cultures were treated with Sal, and this conditioned medium containing mediators, including the potential effector CCL2, was isolated and applied to THP-1 cells. This treatment resulted in approximately 19 % cell proliferation as well as activation of mTOR and induction of phosphorylated 4E-BP1, S6K1, PI3K, and AKT proteins. Treatment with rapamycin, an mTOR inhibitor, attenuated the proliferation of THP-1 cells. U87 glial cells were essential for this as medium conditioned without them had no effect on THP-1 cells. These results suggest a positive effect of THP-1 cells on Sal-induced neurotoxicity in a cellular model of PD and this is likely mediated by the enhancement of cell proliferation through activation of the mTOR signaling pathway. Hence, PBMCs and their mTOR signaling pathway could be of therapeutic benefit in treating the endogenous neurotoxin-induced neuroinflammation in PD.
authors.affiliation: School of Life Science, Beijing Institute of Technology, 5 South Zhongguancun Street, Haidian District, Beijing, 100081, People's Republic of China.
authors.forename: Fuli
authors.initials: F
authors.lastname: Wang
authors.forename: Junjun
authors.initials: J
authors.lastname: Ni
authors.forename: Xianghan
authors.initials: X
authors.lastname: Wang
authors.forename: Bingjie
authors.initials: B
authors.lastname: Xie
authors.forename: Chengcheng
authors.initials: C
authors.lastname: Feng
authors.forename: Sibo
authors.initials: S
authors.lastname: Zhao
authors.forename: Yasmeem
authors.initials: Y
authors.lastname: Saeed
authors.forename: Hong
authors.initials: H
authors.lastname: Qing
authors.forename: Yulin
authors.initials: Y
authors.lastname: Deng
mesh_terms: D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects / Q000502:physiology; D002470:Cell Survival / Q000187:drug effects / Q000502:physiology; D018920:Coculture Techniques; D004305:Dose-Response Relationship, Drug; D006801:Humans; D007546:Isoquinolines / Q000494:pharmacology* / Q000633:toxicity; D007963:Leukocytes, Mononuclear / Q000187:drug effects / Q000378:metabolism; D009000:Monocytes / Q000187:drug effects / Q000378:metabolism*; D009447:Neuroblastoma / Q000378:metabolism*; D015398:Signal Transduction / Q000187:drug effects / Q000502:physiology*; D058570:TOR Serine-Threonine Kinases / Q000378:metabolism*
chemical_list: D007546:Isoquinolines; C036617:salsolinol; C546842:MTOR protein, human; D058570:TOR Serine-Threonine Kinases