title: Growth inhibition and induction of G(1) phase cell cycle arrest in neuroblastoma SH-SY5Y cell by tri-ortho-cresyl phosphate.
abstract: It has been known that tri-ortho-cresyl phosphate (TOCP) can induce delayed neurotoxicity in humans and sensitive animal species; however, it also has influence on the developing central nervous system or differentiating neuronal cells. In this study, the effects of TOCP on cell proliferation and cell cycle regulation and the mechanisms that contribute to this effect were investigated by using human neuroblastoma SH-SY5Y cell line. Treatment of the cells with TOCP suppressed cell proliferation and reduced cell viability in a dose- and time-dependent manner. Analysis of cell cycle profile indicated that TOCP blocked cell cycle progression by arresting the cell cycle at G(1) phase. The data of determination of cell cycle regulated molecules at mRNA and protein levels showed that TOCP decreased cyclin D1 and increased p21 expression, while did not affect the p53 and p27 levels. Thus, these results indicated that TOCP might induce potential neurodevelopmental toxicity, and a possible mechanism of this toxicity might be the disturbance of cell proliferation by disrupting cell cycle regulatory proteins cyclin D1 and p21 expression.
authors.affiliation: Laboratory of Molecular Toxicology, State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Datunlu Road, Beijing 100101, PR China.
authors.forename: Ding-Xin
authors.initials: DX
authors.lastname: Long
authors.forename: Yi-Jun
authors.initials: YJ
authors.lastname: Wu
mesh_terms: D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D019938:Cyclin D1 / Q000032:analysis; D004305:Dose-Response Relationship, Drug; D016193:G1 Phase / Q000187:drug effects*; D006801:Humans; D009447:Neuroblastoma / Q000473:pathology; D014317:Tritolyl Phosphates / Q000633:toxicity*
chemical_list: D014317:Tritolyl Phosphates; D019938:Cyclin D1; C025541:tri-o-cresyl phosphate