Breakage of a DNA-protein complex induced by bleomycin and their repair in cultured mouse fibroblasts.

نویسندگان

  • M Saito
  • T Ando
چکیده

The effect of bleomycin on DNA strand breakage and its repair in cultured mouse fibroblast strain L-P3 (a substrain of L929) was studied. Treatment of L-P3 cells with bleomycin caused single-strand breaks of DNA as revealed by alkaline sucrose gradient centrifugation. The singlestrand breaks of DNA were rejoined within 3 hr when the treated cells were incubated at 37°in a medium free of the antibiotic ("recovery incubation"). Analysis by neutral

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Single-strand scission and repair of DNA in mammalian cells by bleomycin.

DNA single-strand breakage by bleomycin treatment of cultured mammalian cells was demonstrated by the method of alkaline elution. Elution patterns from treated L1210 cells indicated that part of the DNA was extensively broken while the remainder was affected to a lesser degree. This biphasic effect, which was less prominent in human fibroblasts, may reflect a selective sensitivity either of par...

متن کامل

Regulation of bleomycin-induced DNA breakage and chromatin structure in lung endothelial cells by integrins and poly(ADP-ribose) polymerase.

Activation of endothelial cell integrins inhibits DNA breakage by diverse agents, including the DNA-damaging agent bleomycin. DNA breaks activate nuclear poly(ADP-ribose) polymerase (PARP), which regulates chromatin structure and DNA repair. We determined the role of PARP in suppression of bleomycin genotoxicity by integrins using wild-type and PARP knockout mouse lung endothelial cells (MLEC),...

متن کامل

Strand scission and rejoining of DNA in cultured mammalian cells induced by 4-nitroquinoline 1-oxide.

The effect of the carcinogen, 4-nitroquinoline 1-oxide, on cultured mouse fibroblasts, strain L-P3, a substrain of L-929, was studied. Cells were cultured in a proteinand lipid-free synthetic medium, DM-120. Strand breakage and repair of DNA caused by 4-nitroquinoline 1-oxide was examined. 4-Nitroquinoline 1-oxide caused singleand double-strand breaks of DNA as shown by alkaline and neutral suc...

متن کامل

Base excision repair proteins are required for integrin-mediated suppression of bleomycin-induced DNA breakage in murine lung endothelial cells.

Engagement of integrin cell adhesion receptors suppresses bleomycin (BLM)-induced DNA strand breakage in endothelial cells. Previous investigation of cells from poly(ADP-ribose) polymerase (PARP)-1 knockout mice and with an inhibitor of the enzyme indicated that this facilitator of base excision repair (BER) is required for integrin-mediated suppression of DNA strand breakage. Here, small inhib...

متن کامل

Lidocaine potentiation of bleomycin A2 cytotoxicity and DNA strand breakage in L1210 and human A-253 cells.

The survival of cultured L1210 cells exposed to bleomycin A2 (BLM A2) was markedly decreased by coincubation with the local anesthetic lidocaine. The potentiation occurred with concentrations of lidocaine that were nontoxic and was dependent upon both the concentration of lidocaine and BLM A2. A 1000-fold decrease in survival was seen with a 1-h exposure to 8 mM lidocaine and 10 microM BLM A2 c...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Cancer research

دوره 33 7  شماره 

صفحات  -

تاریخ انتشار 1973