title: Increased cytotoxicity of N6-(delta 2-isopentenyl)adenosine in combination with pentostatin against L-1210 leukemia cells.
abstract: Pentostatin (I), a tight-binding inhibitor of adenosine deaminase, was evaluated in combination with the partially effective antitumor nucleoside N6-(delta 2-isopentenyl)adenosine (II) for cytotoxic activity against cultured L-1210 lymphocytic mouse leukemia cells. Although I alone (less than or equal to 10 micrograms/ml) was ineffective, it significantly potentiated and prolonged the cytotoxic and cytostatic activities of II. The combination of I (2-10 micrograms/ml) with II (25 micrograms/ml) resulted in inhibition of cellular proliferation (80-96%) within 24 hr with maintenance at that level for an extended period of time due to the continued ability of I to prevent the facile deamination of the allylic side chain of II. This type of adjuvant chemoprotection has potential use for other labile oncologic agents.
mesh_terms: D000241:Adenosine / Q000031:analogs & derivatives*; D000818:Animals; D000970:Antineoplastic Agents; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D003070:Coformycin / Q000031:analogs & derivatives / Q000494:pharmacology*; D007541:Isopentenyladenosine / Q000494:pharmacology*; D007939:Leukemia L1210 / Q000188:drug therapy*; D051379:Mice; D015649:Pentostatin; D012263:Ribonucleosides / Q000494:pharmacology*
chemical_list: D000970:Antineoplastic Agents; D012263:Ribonucleosides; D003070:Coformycin; D015649:Pentostatin; D007541:Isopentenyladenosine; D000241:Adenosine