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Japanese Journal of Cancer Research : Gann logoLink to Japanese Journal of Cancer Research : Gann
. 1992 Dec;83(12):1273–1278. doi: 10.1111/j.1349-7006.1992.tb02758.x

Modifying Effects of Fungal and Herb Metabolites on Azoxymethane‐induced Intestinal Carcinogenesis in Rats

Naoki Yoshimi 1,✉, Aijin Wang 1, Yukio Morishita 1, Takuji Tanaka 1, Shigeyuki Sugie 1, Kiyoshi Kawai 2, Joji Yamahara 3, Hideki Mori 1
PMCID: PMC5918742  PMID: 1483942

Abstract

Modifying effects of a fungal product, flavoglaucin, and four plant‐derived chemicals, shikonin, gingerol, oleanolic acid and paeoniflorin, on intestinal carcinogenesis were examined in a rat model using azoxymethane (AOM). A total of 280 male F344 rats, 6 weeks old, were divided into 12 groups. Group 1 (30 rats) was given two subcutaneous injections of 15 mg/kg of AOM at the start of the experiment. Groups 2 (30 rats), 3 (20 rats), 4 (20 rats), 5 (30 rats) and 6 (30 rats) received a test chemical (flavoglaucin, shikonin, gingerol, oleanolic acid or paeoniflorin, respectively) in the diet at a concentration of 0.02% for 3 weeks, during which time AOM was applied, and then kept on basal diet until the end of experiment (one year). Groups 7–11 (each 20 rats) were given a test chemical corresponding to Groups 2–6, respectively. Group 12 (20 rats) served as a control. The incidence and average number of intestinal tumors in Group 2 (47%, 0.57 ± 0.68) were significantly less than in Group 1 (74%, 1.07 ± 0.87) (P < 0.05, respectively). Multiplicity of intestinal neoplasms of Group 3 (0.55 ± 0.60) or 4 (0.47 ± 0.51) was also significantly smaller than that of Group 1 (P < 0.05 and P < 0.01, respectively). These results suggest that flavoglaucin, shikonin and gingerol might be promising chemopreventive agents for intestinal neoplasia.

Keywords: Chemoprevention, Fungal metabolite, Herb, Intestinal carcinogenesis, Blocking effect

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