title: Quantitation of apoptosis induction by etoposide or hydroxyurea in mouse interleukin 3-dependent lymphoma cells.
abstract: BACKGROUND
  The apoptosis induction by etoposide or hydroxyurea in mouse interleukin 3-dependent lymphoma cells (DA-1) was studied. Treatments with 1.25 mM hydroxyurea and 100 microM etoposide for 17 hours were considered appropriate concentrations for such studies.
  
  
  METHODS
  The viability of the cells was studied by propidium iodide exclusion. The presence of apoptotic bodies was observed, and DNA fragmentation of apoptotic cells was asessed by the observation of ladder patterns in agarose electrophoresis gels and an increase in the proportion of cells with subdiploid DNA content in cytometric studies.
  
  
  RESULTS
  Alterations of membrane properties, DNA degradation and chromatin condensation highlighted a possible apoptotic process induced by these two antitumor agents.
  
  
  CONCLUSIONS
  These studies have established conditions for examining apoptotic processes in interleukin 3-dependent lymphoma cells. This is of great interest for deeper analysis of the mechanisms involved in the apoptosis of these cells after interleukin 3 depletion or treatment with cytotoxic antitumor compounds.
authors.affiliation: Departamento de Bioquímica y Biología Molecular, Campus Universitario, Universidad de Alcalá, 28871 Alcalá de Henares, Madrid, Spain.
authors.forename: Gemma
authors.initials: G
authors.lastname: Olmos
authors.forename: Alfredo
authors.initials: A
authors.lastname: Prieto
authors.forename: Angel
authors.initials: A
authors.lastname: Herráez
authors.forename: M Cristina
authors.initials: MC
authors.lastname: Tejedor
authors.forename: Melchor
authors.initials: M
authors.lastname: Alvarez-Mon
authors.forename: José C
authors.initials: JC
authors.lastname: Diez
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects*; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D053938:DNA Fragmentation / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D005047:Etoposide / Q000494:pharmacology*; D005434:Flow Cytometry; D006918:Hydroxyurea / Q000494:pharmacology*; D007377:Interleukin-3 / Q000378:metabolism*; D008223:Lymphoma; D051379:Mice
chemical_list: D000970:Antineoplastic Agents; D007377:Interleukin-3; D005047:Etoposide; D006918:Hydroxyurea