DNA damage and repair in L1210 cells exposed to 1-(2-chloroethyl)-3-cyclohexyl-1-nitrosourea.

Abstract:

:The DNA of L1210 cells exposed to low concentrations of 1-(2-chloroethyl)=3-cyclohexyl-1-nitrosourea has been analyzed for the presence of single-strand breaks. DNA from 1-(2-chloroethyl)-3-cyclohexyl-1-nitrosourea-treated cells both sediments more slowly than control DNA on alkaline sucrose gradients andshows a greater extent of strand separation of the DNA helix in alkali. These effects are a typical result of exposure of cellular DNA to alkylating agents or ionizing radiation. The extent of DNA damage caused by 1-(2-chloroethyl)-3-cyclohexyl-1-nitrosourea has been related to the same amount of damage resulting from exposure of cells to low doses of gamma-irradiation. The rate and extent of repair of 1-(2-chloroethyl)-3-cyclohexyl-1-nitrosourea-induced damage is slow and incomplete, compared with the repair of gamma-irradiation damage to DNA. It is concluded that 1-(2-chloroethyl)-3-cyclohexyl-1-nitrosourea behaves as a weak alkylating agent, a property that may explain its antitumor properties.

journal_name

Cancer Res

journal_title

Cancer research

authors

Hilton J,Bowie DL,Gutin PH,Zito DM,Walker MD

subject

Has Abstract

pub_date

1977-07-01 00:00:00

pages

2262-6

issue

7 Pt 1

eissn

0008-5472

issn

1538-7445

journal_volume

37

pub_type

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