Published in:
Open Access
01-12-2015 | Primary research
Combination of cyclophosphamide and double-stranded DNA demonstrates synergistic toxicity against established xenografts
Authors:
Ekaterina A Alyamkina, Valeriy P Nikolin, Nelly A Popova, Alexandra M Minkevich, Artem V Kozel, Evgenia V Dolgova, Yaroslav R Efremov, Sergey I Bayborodin, Oleg M Andrushkevich, Oleg S Taranov, Vladimir V Omigov, Vladimir A Rogachev, Anastasia S Proskurina, Evgeniy I Vereschagin, Elena V Kiseleva, Maria V Zhukova, Alexandr A Ostanin, Elena R Chernykh, Sergey S Bogachev, Mikhail A Shurdov
Published in:
Cancer Cell International
|
Issue 1/2015
Login to get access
Abstract
Background
Extracellular double-stranded DNA participates in various processes in an organism. Here we report the suppressive effects of fragmented human double-stranded DNA along or in combination with cyclophosphamide on solid and ascites grafts of mouse Krebs-2 tumor cells and DNA preparation on human breast adenocarcinoma cell line MCF-7.
Methods
Apoptosis and necrosis were assayed by electrophoretic analysis (DNA nucleosomal fragmentation) and by measurements of LDH levels in ascitic fluid, respectively. DNA internalization into MCF-7 was analyzed by flow cytometry and fluorescence microscopy.
Results
Direct cytotoxic activity of double-stranded DNA (along or in combination with cyclophosphamide) on a solid transplant was demonstrated. This resulted in delayed solid tumor proliferation and partial tumor lysis due to necrosis of the tumor and adjacent tissues. In the case of ascites form of tumor, extensive apoptosis and secondary necrosis were observed. Similarly, MCF-7 cells showed induction of massive apoptosis (up to 45%) as a result of treatments with double-stranded DNA preparation.
Conclusions
Double-stranded DNA (along or in combination with cyclophosphamide) induces massive apoptosis of Krebs-2 ascite cells and MCF-7 cell line (DNA only). In treated mice it reduces the integrity of gut wall cells and contributes to the development of systemic inflammatory reaction.