The influence of reserpine on nitrogen metabolizing enzymes in chick liver

Inhibitory effects of chlorogenic acid, reserpine, polyprenoic acid (E-5166), or coffee on hepatocarcinogenesis in rats and hamsters

Four different experiments were performed in order to examine the modifying effects of chlorogenic acid (CA), reserpine, polyprenoic acid (E-5166), and coffee on chemical carcinogenesis in rats or hamsters. Experiment 1: The numbers of hyperplastic liver cell foci and the incidence of colon tumors in male and female Syrian golden hamsters given a single intravenous injection of methylazoxymethanol (MAM) acetate and then fed the diet containing 0.025% CA for 24 wk were significantly lower than those of hamsters given MAM acetate alone. Experiment 2: The incidence of altered hepatocellular foci in female ACI/N rats given N-2-fluorenylacetamide (FAA, 0.02% in diet) for 10 wk and reserpine (weekly subcutaneous injections, 1 microgram/g body weight) during or after (17 wk) FAA exposure was significantly lower than that of rats given FAA alone. Experiment 3: The number of hepatocellular foci in male ACI/N rats given 0.02% FAA diet for 13 wk and E-5166 by gavage (40 mg/kg body weight, 3 times/wk) for 16 wk after the end of FAA exposure was significantly smaller than that in rats given FAA diet alone. Experiment 4: Incidences of liver tumors and hepatocellular foci of rats given concurrent dietary administration of aminopyrine (0.01%) and sodium nitrite (0.1%) and coffee solution as a drinking water for 630 da were significantly lower than those of rats given aminopyrine and sodium nitrite. Thus, the tested compounds had inhibitory effects on chemical carcinogenesis in liver or colon.

Inhibitory effect of reserpine on N-2-fluorenylacetamide-induced hepatocarcinogenesis in rats

The effect of reserpine on N-2-fluorenylacetamide (FAA)-induced hepatocarcinogenesis was examined in female ACI rats. The incidence of hepatocellular altered foci (number/cm2) in rats of group 1 given FAA (0.02% in diet) and reserpine (subcutaneous injections of 1 microgram/g body weight, once a week) simultaneously for 10 weeks, and fed a basal diet for 17 weeks was significantly smaller than that of group 3 exposed to FAA alone for 10 weeks and given the basal diet for the subsequent 17 weeks (1.51 +/- 0.58 vs. 11.46 +/- 3.13, P less than 0.001). Similarly, the incidence of the foci of group 2 given reserpine for 16 weeks after discontinuation of FAA exposure for 10 weeks and a one-week interval of basal diet, was also significantly smaller than that of group 3 (1.51 +/- 0.62 vs. 11.46 +/- 3.13, P less than 0.001). No hepatocellular foci were seen in rats of group 4 given reserpine alone for 27 weeks and group 5 (untreated controls). These results indicate that reserpine has an inhibitory effect on FAA-initiated hepatocarcinogenesis.