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During the induced differentiation of the human promyelocytic leukaemic cell line, HL-60, along the myelocytic lineage, DNA strand-breaks are formed. These breaks which are formed in the face of a proficient DNA repair mechanism, are only transiently maintained and subsequently become religated. The ligation of these breaks requires the activity of the nuclear adenosine diphosphoribosyl transferase (ADPRT). Inhibition of nuclear ADPRT, an enzyme totally dependent on the presence of DNA strand-breaks for its activity and required for efficient DNA repair in eukaryotic cells, blocks the religation of these breaks but not their formation. The inhibition of DNA strand ligation in the differentiating HL-60 cells results in loss of viability and cell death.

Transient formation of DNA strand breaks during the induced differentiation of a human promyelocytic leukaemic cell line, HL-60