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. 1984 Dec;81(23):7461–7465. doi: 10.1073/pnas.81.23.7461

Induction of a Ca2+, Mg2+-dependent endonuclease activity during the early stages of murine erythroleukemic cell differentiation.

G McMahon, J L Alsina, S B Levy
PMCID: PMC392166  PMID: 6594696

Abstract

A Ca2+, Mg2+-dependent endonuclease activity was detected in erythroleukemic cells undergoing differentiation in vitro in response to induction by dimethyl sulfoxide (Me2SO) or hexamethylene-bis-acetamide (HMBA). The endonuclease activity was demonstrated in isolated nuclei within 6 hr after the addition of inducer, reached maximum levels between 24 and 48 hr, and returned to control levels within 72 hr. The activity caused single strand breaks in high molecular weight native DNA, which could be labeled at exposed 3'-OH termini with Escherichia coli DNA polymerase I and radiolabeled nucleotides. Alkaline elution studies revealed DNA fragmentation that appeared coincident with the presence of the endonuclease activity. The detection and levels of single strand DNA breakage correlated with induction of terminal differentiation by Me2SO or HMBA. Induction of the endonuclease activity was reversible: depletion of Me2SO from the growth medium after treatment for 6 and 18 hr led to a rapid decrease in the level of activity. Removal of the inducer prevented terminal differentiation, a finding that strongly suggests the endonuclease activity is present during the precommitment phase of differentiation. DNA fragmentation was not observed in cells incubated with hemin, which has been shown previously to increase the cytoplasmic level of globin mRNA without causing commitment to terminal maturation. Me2SO did not induce the endonuclease activity or DNA fragmentation in an uninducible Friend cell line.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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