Macromolecular DNA-damage in murine and human leukemic and lymphoid cells after in vitro exposure to ASTA Z 7557 (INN mafosfamide).

Abstract:

:Cyclophosphamide (CPA) is widely used against leukemic and lymphoproliferative diseases, but in vitro studies on response to this agent so far have been limited to instable derivatives with poor galenic properties. ASTA Z 7557 is a newly synthesized "activated cyclophosphamide" that circumvents the need for hepatic activation and has good stability. The critical cytotoxic lesions after exposure to bifunctional alkylating agents presumably are DNA interstrand crosslinks (ISC). We have, therefore, examined the formation and apparent removal of ISC after in vitro treatment with ASTA Z 7557 by use of the highly sensitive alkaline elution technique. Survival of murine L1210 cells was determined after 1 hour in vitro exposure with a D 37 value of 5.7 micrograms/ml (from the initial shoulder part of the survival curve) and a Do value of 1.5 micrograms/ml (from the exponential part of the curve). Previous labelling of L1210 cells by 125IUdR simplified the alkaline elution procedure but there was some cytotoxicity of the radiochemical itself with a reduction of cloning efficiency from 77% to 61%. The maximum of ISC was observed at 6 h after initiation of treatment with much of the damage apparently removed at 24 h. The simultaneous presence of DNA single strand breaks (SSB), however, confounds the analysis of DNA damage at 24 h and early cytolysis and unaided death of human lymphocytes often preclude the analysis of macromolecular damage at this time. Human peripheral blood cells isolated from patients with leukemic or lymphoproliferative diseases showed a remarkable heterogeneity with regard to the formation of ISC at 3 h.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Invest New Drugs

authors

Osieka R,Pannenbäcker R,Schmidt CG

doi

10.1007/BF00232346

subject

Has Abstract

pub_date

1984-01-01 00:00:00

pages

161-8

issue

2

eissn

0167-6997

issn

1573-0646

journal_volume

2

pub_type

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