title: [Permeability of N,N-bis(2-chloroethyl)-diamido-phosphoric-acid into tumor cells (author's transl)].
abstract: The uptake of tritiated N,N-bis(2-chloroethyl)-diamido-phosphoric-acid into Ehrlich-Ascites-Tumor cells of mice was studied by means of the siliconoil-filtration technique. At 10 mM concentration no permeation of the metabolite into the tumor cells could be found within 5 min at 1 degrees C, while its congenors cyclophosphamide and 4-hydroperoxycyclophosphamide (1 mM) were shown to permeate into the cells very easily reaching saturation values. Thus lack of permeation into tumor cells of N,N-bis(2-chloroethyl)-diamidophosphoric-acid seems to be the reason for the poor cytotoxic activity of this metabolite of cyclophosphamide.
mesh_terms: D000818:Animals; D002286:Carcinoma, Ehrlich Tumor / Q000188:drug therapy / Q000378:metabolism*; D051379:Mice; D010539:Permeability; D010752:Phosphoramide Mustards / Q000008:administration & dosage / Q000378:metabolism*
chemical_list: D010752:Phosphoramide Mustards
vernacular_title: Zur Frage der Permeabilität von N,N-Bis(2-chloräthyl)-phosphorsäurediamid in Tumorzellen.