A novel copper complex induces ROS generation in doxorubicin resistant Ehrlich ascitis carcinoma cells and increases activity of antioxidant enzymes in vital organs in vivo
IR@IICB: CSIR-Indian Institute of Chemical Biology, KolkataView Archive Info
A novel copper complex induces ROS generation in doxorubicin
resistant Ehrlich ascitis carcinoma cells and increases activity of
antioxidant enzymes in vital organs in vivo
Mookerjee Basu, Jayati
Panda, Gouri S
Choudhuri, Soumitra K
Cancer Biology and Inflammatory Disorder Division
Background: In search of a suitable GSH-depleting agent, a novel copper complex viz., copper N-(2-
hydroxyacetophenone) glycinate (CuNG) has been synthesized, which was initially found to be a potential
resistance modifying agent and later found to be an immunomodulator in mice model in different doses.
The objective of the present work was to decipher the effect of CuNG on reactive oxygen species (ROS)
generation and antioxidant enzymes in normal and doxorubicin-resistant Ehrlich ascites carcinoma (EAC/
Dox)-bearing Swiss albino mice.
Methods: The effect of CuNG has been studied on ROS generation, multidrug resistance-associated
protein1 (MRP1) expression and on activities of superoxide dismutase (SOD), catalase (CAT) and
glutathione peroxidase (GPx).
Results: CuNG increased ROS generation and reduced MRP1 expression in EAC/Dox cells while only
temporarily depleted glutathione (GSH) within 2 h in heart, kidney, liver and lung of EAC/Dox bearing
mice, which were restored within 24 h. The level of liver Cu was observed to be inversely proportional
to the level of GSH. Moreover, CuNG modulated SOD, CAT and GPx in different organs and thereby
reduced oxidative stress. Thus nontoxic dose of CuNG may be utilized to reduce MRP1 expression and
thus sensitize EAC/Dox cells to standard chemotherapy. Moreover, CuNG modulated SOD, CAT and and
GPx activities to reduce oxidative stress in some vital organs of EAC/Dox bearing mice. CuNG treatment
also helped to recover liver and renal function in EAC/Dox bearing mice.
Conclusion: Based on our studies, we conclude that CuNG may be a promising candidate to sensitize
drug resistant cancers in the clinic.
Mookerjee, Ananda and Mookerjee Basu, Jayati and Majumder, Surajit and Chatterjee, Shilpak and Panda, Gouri S and Dutta, Pranabananda and Pal, Smarajit and Mukherjee, Pratima and Efferth, Thomas and Roy, Syamal and Choudhuri, Soumitra K (2006) A novel copper complex induces ROS generation in doxorubicin resistant Ehrlich ascitis carcinoma cells and increases activity of antioxidant enzymes in vital organs in vivo. BMC Cancer, 6 (267). pp. 1-11.