Heterogeneous survival and cell kinetics responses of human astrocytoma clones to alpha-difluoromethylornithine in vitro

Invest New Drugs. 1989 Jul;7(2-3):155-61. doi: 10.1007/BF00170852.


The effects of alpha-difluoromethylornithine (DFMO) on survival, cell kinetics and polyamine levels were studied on two clones of human astrocytoma in vitro. The survival responses were dose and time dependent; and treatments with DFMO which lasted for 72 h resulted in heterogeneous responses with one clone being up to 6 times more sensitive than the other. Shorter treatments produced more uniform killing in the clones. A continuous exposure of the cells to 5 mM DFMO resulted in a rapid decrease in putrescine values in both clones, followed by decreases in the spermidine levels. These effects were closely followed by 148% to 170% increases in cell population doubling times, and a lowering of saturation densities. No clear correlations could be established among baseline polyamine levels and cell kinetics or survival responses to DFMO treatments.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Astrocytoma / metabolism
  • Astrocytoma / pathology*
  • Biogenic Polyamines / metabolism
  • Cell Division / drug effects
  • Cell Survival / drug effects*
  • Clone Cells / drug effects
  • Eflornithine / pharmacology*
  • Humans
  • Time Factors
  • Tumor Cells, Cultured / drug effects
  • Tumor Cells, Cultured / metabolism
  • Tumor Cells, Cultured / pathology


  • Biogenic Polyamines
  • Eflornithine