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We examined the inhibitional and nutritional effects of total parenteral nutrition (TPN) containing D-amino acids (D-phenylalanine, D-Phe; D-valine, D-Val; D-leucine, D-Leu; D-methionine, D-Met) on tumor growth in AH109A hepatoma-bearing rats. Five experimental groups were examined: a control amino acid solution group (control group), D-Phe group, D-Val group, D-Leu group and D-Met group. The analysis of tumor volume and weight revealed significant tumor growth inhibition in the D-Val group as compared with the control group. In the D-Val group, decreases of DNA and protein contents in the tumor tissues were also observed. The D-Leu and D-Met groups showed a tendency toward tumor growth inhibition. The protein content in the liver tissues of these two groups was significantly higher as compared with the control group. The DNA content in the liver tissue was also significantly higher in the D-Met group. The body weight including the tumor (on the final day of TPN) was significantly lower in the D-Val group as compared with the control group, but there was no significant difference in the groups for body weights not including tumors (carcass body weight). The hematocrit and hemoglobin values, indicators of anemia, were significantly higher in the D-Val group as compared with the control group. From these results, regarding tumor growth inhibition, the D-Val solution had the strongest inhibitory effect with no negative influence on the host, and improvement of nutritional status was also suggested in the rats that received the D-Leu or D-Met solutions.

Tumor Growth Inhibition and Nutritional Effect of D-Amino Acid Solution in AH109A Hepatoma-Bearing Rats.