Abstract：
:Bifunctional alkylating agents are known to produce cross-links between DNA and protein and between paired DNA strands. The possibility of discriminating these two classes of cross-links in L1210 cells treated with haloethylnitrosoureas or nitrogen mustard was explored with the alkaline elution technique. Two classes of cross-links were demonstrated, based on sensitivity to proteinase K; the proteinase-sensitive cross-links appear to be DNA-protein cross-links, and the proteinase-resistant class may include interstrand cross-links. Proteinase-sensitive cross-links form more rapidly than do proteinase-resistant cross-links in cells treated with chloroethylnitrosoureas, perhaps because these agents can chloroethylate protein sulfhydryl or amino groups followed by rapid reaction of these chloroethylated groups with DNA. Although both types of cross-links produced by nitrogen mustard disappeared or were repaired after 24 hr, the removal of cross-links produced by chloroethylnitrosoureas either did not occur or was incomplete in 24 hr. In addition to cross-links, cells treated with haloethylnitrosoureas exhibited DNA strand breaks; a method is suggested for estimating the apparent frequencies of strand breaks and cross-links in the DNA.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Ewig RA,Kohn KWsubject
Has Abstractpub_date
1978-10-01 00:00:00pages
3197-203issue
10eissn
0008-5472issn
1538-7445journal_volume
38pub_type
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