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Objective: To observe the effects of a novel ATRA derivative ATPR on lung adenocarcinoma A549 cells and to explore the probable mechanism of ATPR inhibiting A549 cells migration.Methods: The cytotoxicity of ATRA and ATPR on A549 cells was assessed using MTT assay.Wound healing assay was used to analyze the influence of ATRA, ATPR, ML-7 (a high selective inhibitor of MLCK), PMA (an activator of MAPKs) and PD98059 (a high selective inhibitor of ERK1/2) on the migration of A549 cells.And the expression of MLCK and phosphorylation of myosin light chain (MLC) was performed by western blot.