Sodium Valproate Enhances the Urethane-Induced Lung Adenomas and Suppresses Malignization of Adenomas in Ovariectomized Female Mice.
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 (n = 60; 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 (n = 60) 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 (8.29 ± 0.58 versus 6.0 ± 0.63, p < 0.02). No significant difference in the number of tumors per mouse was revealed while comparing the nonovariectomized urethane- and urethane-NaVP-treated groups (p = 0.13). 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 (p = 0.031). NaVP together with low estrogen may have a protective effect on the malignization of adenomas in ovariectomized mice.
Laboratory of Carcinogenesis and Tumor Pathophysiology, National Cancer Institute, Vilnius University, Santariskiu 1, LT-08660 Vilnius, Lithuania.
Donatas
D
Stakisaitis
Department of Histology and Embryology, Lithuanian University of Health Sciences, Mickeviciaus 9, LT-44307 Kaunas, Lithuania.
Raminta
R
Mozuraite
Department of Histology and Embryology, Lithuanian University of Health Sciences, Mickeviciaus 9, LT-44307 Kaunas, Lithuania ; Veterinary Academy, Lithuanian University of Health Sciences, Tilzes 18, LT-47181 Kaunas, Lithuania.
Nomeda
N
Juodziukyniene
Laboratory of Carcinogenesis and Tumor Pathophysiology, National Cancer Institute, Vilnius University, Santariskiu 1, LT-08660 Vilnius, Lithuania.
Janina
J
Didziapetriene
Laboratory of Carcinogenesis and Tumor Pathophysiology, National Cancer Institute, Vilnius University, Santariskiu 1, LT-08660 Vilnius, Lithuania.
Saule
S
Uleckiene
Veterinary Academy, Lithuanian University of Health Sciences, Tilzes 18, LT-47181 Kaunas, Lithuania.
Paulius
P
Matusevicius
Department of Histology and Embryology, Lithuanian University of Health Sciences, Mickeviciaus 9, LT-44307 Kaunas, Lithuania.
Angelija
A
Valanciute