Cytotoxicity of the hinokitiol-related compounds, gamma-thujaplicin and beta-dolabrin.

Abstract

Gamma-thujaplicin and beta-dolabrin, the constituents of the wood of Thujopsis dolabrata Sieb. et Zucc. var. hondai showed strong in vitro cytotoxic effects against the human stomach cancer cell lines KATO-III and Ehrlich's ascites carcinoma. The cytotoxic effects of the two compounds against both tumor cell lines were clear when cell growth was measured by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) method. Gamma-thujaplicin and beta-dolabrin at 0.32 microg/ml inhibited cell growth of human stomach cancer KATO-III by 85 and 67%, and Ehrlich's ascites carcinoma by 91 and 75%, respectively. There is no large difference in cytotoxicity between these compounds, but the activity of gamma-thujaplicin was slightly more potent than that of beta-dolabrin. On the other hand, hinokitiol acetate did not show a cytotoxic effect, suggesting that at least a part of the mechanism of the cytotoxic effect of hinokitiol-related compounds is due to metal chelation between the carbonyl group at C-1 and the hydroxyl group at C-2 in the tropolone skeleton of these molecules. The acute toxicities [50% lethal dose (LD50) value: intraperitoneal injection, Van der Waedem] of gamma-thujaplicin and beta-dolabrin in mice were 277 mg/kg and 232 mg/kg, respectively.

• Authors: E Matsumura, Y Morita, T Date, H Tsujibo, M Yasuda, T Okabe, N Ishida, Y Inamori
• Journal: Biological & pharmaceutical bulletin (Biol Pharm Bull) Vol. 24 Issue 3 Pg. 299-302 (Mar 2001) ISSN: 0918-6158 [Print] Japan
• PMID: 11256489 (Publication Type: Journal Article)

Chemical References

• 2-hydroxy-5-isopropyl- 2,4,6-cycloheptatrienone
• Antineoplastic Agents, Phytogenic
• Cycloheptanes
• Monoterpenes
• beta-dolabrin
• Tropolone
• beta-thujaplicin

Topics

• Animals
• Antineoplastic Agents, Phytogenic (pharmacology, toxicity)
• Body Weight (drug effects)
• Carcinoma, Ehrlich Tumor (pathology)
• Cycloheptanes (pharmacology, toxicity)
• Drug Screening Assays, Antitumor
• Humans
• Lethal Dose 50
• Male
• Mice
• Monoterpenes
• Stomach Neoplasms (pathology)
• Tropolone (analogs & derivatives, pharmacology, toxicity)
• Tumor Cells, Cultured