Inhibitory effects of RRR-alpha-tocopheryl succinate on benzo(a)pyrene (B(a)P)-induced forestomach carcinogenesis in female mice - PubMed (original) (raw)

Inhibitory effects of RRR-alpha-tocopheryl succinate on benzo(a)pyrene (B(a)P)-induced forestomach carcinogenesis in female mice

K Wu et al. World J Gastroenterol. 2001 Feb.

Abstract

Aim: To study the inhibitory effects of VES (RRR-alpha-tocopheryl Succinate, VES),a derivative of natural Vitamin E, on benzo(a)pyrene(B(a)P)-induced forestomach tumor in female mice.

Methods: The model of B(a)P-induced forestomach tumor was established according to the methods of Wattenberg with slight modify-cations. One hundred and eighty female mice (6 weeks old) were divided into six groups equally; negative control (Succinic acid), vehicle control (Succinate+B(a)P),positive control(B(a)P), high VES(2.5 g/kg.b.w+B(a)P), low VES(1.25 g/kg.b.w+B(a)P)ig as well as VES by ip (20 mg/kg.b.w+B(a)P). Except the negative control group, the mice were administrated with B(a)P ig. and corresponding treatments for 4 weeks to study the anti-carcinogenetic effect of VES during the initiation period. The experiment lasted 29 weeks, in which the inhibitory effects of VES both on tumor incidence and tumor size were tested.

Results: The models of B(a)P-induced forestomach tumor in female mice were established successfully. Some were cauliflower-like, others looked like papilla, even a few were formed into the ulcer cavities. VES at 1.25 g/kg.b.w, 2.5 g/kg.b.w. by ig and 20 mg/kg.b.w. via ip could decrease the number of tumors per mouse (1.7 plus minus 0.41, 1.6 plus minus 0.34 and 1.1 +/- 0.43), being lower than that of B(a)P group (5.4 +/- 0.32, P<0.05). The tumor incidence was inhibited by 18.2%, 23.1% and 50.0%. VES at 1.25 g/kg.b.w., 2.5 g/kg.b.w. by ig and 20 mg/kg.b.w. via ip reduced the total volume of tumors per mouse (54.8 +/- 8.84, 28.4 8 +/- 8.32 and 23.9 8 +/- 16.05), being significantly lower than that of B(a)P group (150.2 8 +/- 20.93, P < 0.01). The inhibitory rates were 63.5%, 81.1% and 84.1%, respectively.

Conclusion: VES has inhibitory effects on B(a)P-induced forestomach carcinogenesis in female mice, especially by ip and it may be a potential anti-cancer agent in vivo.

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Figures

Figure 1

Figure 1

The model of B(a)P-induced forestomach tumor. A. Normal mucosa of forestomach; B. Cauliflower-like tumor; C. Papilla-like tumor; D. Ulcer cavities-like tumor.

Figure 2

Figure 2

Pathological observation of B(a)P-induced forestomach tumor (HE staining) in mice. A. The normal gastric mucosa × 200; B. The epithelium of gastric mucosa formed papillary projection × 100; C. Squamous tumor cells proliferated into connective tissues and they were polyhedral × 100; D. The mitotic figures (white arrow) in the squamous cell carcinoma × 400

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