Inhibitory Effect of Tomato Juice on Rat Urinary Bladder Carcinogenesis after N‐Butyl‐N‐(4‐hydroxybutyl)nitrosamine Initiation

• Published in: Cancer science Vol. 89; no. 1; pp. 22 - 26
• Main Authors: Okajima, Eijiro, Tsutsumi, Masahiro, Ozono, Seiichiro, Akai, Hiroyuki, Denda, Ayumi, Nishino, Hoyoku, Oshima, Syunji, Sakamoto, Hideki, Konishi, Yoichi
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Publishing Ltd 01.01.1998; Japanese Cancer Association; John Wiley & Sons, Inc
• Subjects: Animals; Anticarcinogenic Agents - analysis; Antineoplastic agents; Antioxidants - analysis; Biological and medical sciences; Butylhydroxybutylnitrosamine; Carcinogenesis; Carotenoids - analysis; Chemotherapy; Drinking water; Hyperplasia; Juices; Liver - chemistry; Liver - pathology; Lycopene; Lycopersicon esculentum; Male; Medical sciences; N‐Butyl‐N‐(4‐hydroxybutyl)nitrosamine; Organ Size - drug effects; Oxidants; Pharmacology. Drug treatments; Rat urinary bladder carcinogenesis; Rats; Rats, Inbred F344; Tomato juice; Transitional cell carcinoma; Urinary bladder; Urinary bladder carcinoma; Urinary Bladder Neoplasms - chemically induced; Urinary Bladder Neoplasms - pathology; Urinary Bladder Neoplasms - prevention & control; Urinary system disease; Carcinoma; Rat; Vegetable juice; Rodentia; Pharmacology; Malignant tumor; Urinary tract disease; Experimental study; Tomato; Vertebrata; Chemotherapy; Mammalia; Urinary bladder; Animal; Tumor progression; Bladder disease; Biological effect
• ISSN: 0910-5050; 1347-9032; 1349-7006; 1876-4673
• DOI: 10.1111/j.1349-7006.1998.tb00474.x

The effects of tomato juice on urinary bladder carcinogenesis were studied in male Fischer 344 rats initiated with N‐butyl‐N‐(4‐hydroxybutyl)nitrosamine (BBN) in rats. The animals (6 weeks old) were given 0.05% BBN in their drinking water for 8 weeks, followed by diluted tomato juice for 12 weeks, and killed at 20 weeks after the beginning of the experiment. Lycopene concentrations in the livers of rats given tomato juice were elevated. Histopathological analysis of urinary bladder lesions revealed the numbers, but not incidences, of urinary bladder transitional cell carcinomas (TCCs) to be decreased in the group given tomato juice. No influence on the incidence of simple and nodullopapillary hyperplasias, invasion or differentiation of TCC was noted. These results indicate that tomato juice, presumably the contained lycopene and other anti‐oxidants in combination, exerts an inhibitory effect on the development of TCCs in the rat urinary bladder.