The Journal of Toxicological Sciences
Online ISSN : 1880-3989
Print ISSN : 0388-1350
ISSN-L : 0388-1350
MODIFYING EFFECTS OF BERAPROST SODIUM (TRK-100) ON N-METHYL-N-NITROSOUREA (MNU) CARCINOGENESIS IN F344 RATS
Yasushi KURATAAkihiro HAGIWARASeiko TAMANOMasa-Aki SHIBATAHikaru TANAKAMayumi YAMADAHatsumi ITOShoji FUKUSHIMA
Author information
Keywords: carcinogenesis
JOURNALS FREE ACCESS

1989 Volume 14 Issue SupplementI Pages 1-39

Details
Abstract

The potential tumor-promoting effects of beraprost sodium (TRK-100), stable analogue of prostacyclin (PGI2), were investigated in rats pretreated with N-methyl-N-nitrosourea (MNU) which is a potent initiator of tumor development in a variety of organ or tissues. Male F344 rats were initially given injections of MNU (20 mg/kg b.w. i.p.) twice a week for 3 weeks, and then administered drinking water containing 6, 2, 0.7 or 0.2 ppm of beraprost sodium for the next 29 weeks. For comparison, positive control groups received N-propyl-N-nitrosourea (PNU), which is a carcinogen in hematopoietic system and small intes tine on F344 rat, at the dose of 200, 50 and 12.5 ppm in their drinking water. Appropriate non-treated controls were also included. Numerous tumors were observed in many organs including the hematopoietic system, digestive tract, nervous system, Zymbal's gland (auditory sebaceous glands) and peritoneal mesothelium. However, no tumor-enhancing effects of beraprost sodium were observed. In contrast, the groups treated with PNU demonstrated increased development of tumors in the tongue, forestomach, large intestine and Zymbal's gland. These results thus indicate that beraprost sodium is not capable of modulating the development of MNU-induced tumors.

Information related to the author
© The Japanese Society of Toxicology Headquarters
Next article
feedback
Top