title: [Cellular response to altered autophagy activity in human fibroblast cells overexpressing Ha-RasV12].
abstract: OBJECTIVE
  To study the effect of oncogenic Ras overexpression on autophagic activity in human fibroblast cells in vitro.
  
  
  METHODS
  BJ cells were transfected with H-RasV12 or control vector and treated with chloroquine, small interfering RNA (siRNA) for ATG7, or rapamycin. The cellular responses were analyzed by monitoring the parameters and biomarkers for cell growth, senescence and cell death.
  
  
  RESULTS
  In BJ cells overexpressing H-RasV12, chloroquine treatment resulted in more prominent cell senescence and a significantly increased cell death rate. Suppression of ATG7 mediated by siRNA also promoted cell senescence. Rapamycin treatment also caused an increased cell death rate but attenuated senescence in surviving cells. In control BJ cells, the cellular response to chloroquine included senescence and cell death, which occurred slowly. Rapamycin treatment and siRNA suppression of ATG7 had no obvious effect on control BJ cells.
  
  
  CONCLUSIONS
  Stable cellular overexpression of oncogenic Ras causes tightly controlled suppression of the autophagic activity of human fibroblast cells, and such changes produce significant effect on cell senescence and survival.
authors.affiliation: School of Pharmaceutical Science, Department of Pharmacology, Southern Medical University, Guangzhou 510515, China. E-mail: zouzailubian@126.com.
authors.forename: Ling
authors.initials: L
authors.lastname: Wang
authors.forename: Le
authors.initials: L
authors.lastname: Yu
authors.forename: Chunping
authors.initials: C
authors.lastname: Gu
authors.forename: Yilei
authors.initials: Y
authors.lastname: Li
mesh_terms: D001343:Autophagy; D000071193:Autophagy-Related Protein 7; D016923:Cell Death; D002478:Cells, Cultured; D016922:Cellular Senescence; D005347:Fibroblasts / Q000166:cytology*; D011905:Genes, ras; D006801:Humans; D034741:RNA, Small Interfering; D044764:Ubiquitin-Activating Enzymes / Q000378:metabolism
chemical_list: D034741:RNA, Small Interfering; C509349:ATG7 protein, human; D000071193:Autophagy-Related Protein 7; D044764:Ubiquitin-Activating Enzymes