Antitumor and Antimetastatic Activities of 4-Hydroxyderricin Isolated from Angelica keiskei Roots

Abstract

The roots of Angelica keiskei Koizumi (Umbelliferae) have traditionally been used as a health food considered to have diuretic, laxative, analeptic and lactagogue effects. Recently, it has been thought that the roots and herbs of A. keiskei have preventive effects against coronary heart disease, hypertension and cancer. It has been reported that chalcone derivatives, such as xanthoangelol and 4-hydroxyderricin, are isolated as main components from this root. Recently, we reported that the 50 % ethanol extract, the ethyl acetate-soluble fraction and the isolated xanthoangelol, inhibited tumor growth and metastasis to the lung in Lewis lung carcinoma (LLC)-bearing mice. In the present study, we examined the effects of 4-hydroxyderricin on tumor growth and metastasis to the lung or liver in subcutaneous or intrasplenic LLC-implanted C57BL/6J female mice. 4-Hydroxyderricin at a dose of 50 mg/kg × 2/day orally inhibited the tumor growth in subcutaneous LLC-implanted mice and inhibited the lung metastasis and prolonged the survival time in mice after the removal of subcutaneous tumors by surgical operation. Doxorubicin (5 mg/kg × 2/week, i. p.) inhibited the tumor growth and metastasis to the lung, but it shortened the survival time and reduced the survival rate compared to those in 4-hydroxyderricin-treated mice. 4-Hydroxyderricin inhibited DNA synthesis in LLC cells at a concentration of 100 μM, but it had no effect on the DNA synthesis in human umbilical vein endothelial cells (HUVECs) or on the adherence of LLC cells to HUVECs. 4-Hydroxyderricin inhibited Matrigel-induced formation of capillary-like tubes by HUVECs at concentrations of 10 to 100 μM. The weights of the spleen and thymus in mice with subcutaneously implanted LLC were maintained close to those of normal mice by orally administered 4-hydroxyderricin. In addition, 4-hydroxyderricin (50 mg/kg × 2/day) inhibited the reduction of the numbers of lymphocytes, CD4⁺, CD8⁺ and natural killer (NK)-T cells in the spleen of tumor-removed mice. Doxorubicin reduced the numbers of lymphocytes, CD4⁺, CD8⁺ and NK cells compared to those in LLC-removed mice. These results suggest that the antitumor and antimetastatic activities of 4-hydroxyderricin may be modulated by the immune system and the inhibition of angiogenesis.

Key words

Antitumor activity - antimetastatic activity - 4-hydroxyderricin - Angelica keiskei - Umbelliferae

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