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International Journal of Endocrinology
Volume 2015, Article ID 218219, 10 pages
http://dx.doi.org/10.1155/2015/218219
Research Article

Sodium Valproate Enhances the Urethane-Induced Lung Adenomas and Suppresses Malignization of Adenomas in Ovariectomized Female Mice

1Laboratory of Carcinogenesis and Tumor Pathophysiology, National Cancer Institute, Vilnius University, Santariskiu 1, LT-08660 Vilnius, Lithuania
2Department of Histology and Embryology, Lithuanian University of Health Sciences, Mickeviciaus 9, LT-44307 Kaunas, Lithuania
3Veterinary Academy, Lithuanian University of Health Sciences, Tilzes 18, LT-47181 Kaunas, Lithuania

Received 27 March 2015; Revised 12 May 2015; Accepted 20 May 2015

Academic Editor: Haifei Shi

Copyright © 2015 Donatas Stakisaitis et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In the present study, the possible effect of sodium valproate (NaVP) on urethane-induced lung tumors in female mice has been evaluated. BALB/c mice (; 4–6 weeks old, females) were used in the following groups: (1) urethane-treated; (2) urethane-NaVP-treated; (3) only NaVP-treated; (4) control. In the same groups, ovariectomized female mice () were investigated. Urethane was given intraperitoneally, with a total dose of 50 mg/mouse. In NaVP-treated mice groups, 0.4% aqueous solution of NaVP was offered to mice ad libitum. The duration of the experiment was 6 months. The number of tumors per mouse in ovariectomized mice and in those treated with urethane and NaVP was significantly higher than in mice treated with urethane only ( versus , ). No significant difference in the number of tumors per mouse was revealed while comparing the nonovariectomized urethane- and urethane-NaVP-treated groups (). A significant decrease of adenocarcinoma number in ovariectomized mice treated with a urethane-NaVP as compared with ovariectomized mice treated with urethane only was found (). NaVP together with low estrogen may have a protective effect on the malignization of adenomas in ovariectomized mice.