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Manuscript received 17 September 1996. Initial reviews completed 30 October 1996. Revision accepted 23 December 1996.
, and
Department of Nutritional Sciences, University of Wisconsin, Madison, WI 53706; * Department of Chemistry, University of Indonesia, Depok, Jakarta, Indonesia; and Advanced Medical Research, Madison, WI 53719
Sundry mevalonate-derived constituents (isoprenoids) of fruits, vegetables and cereal grains suppress the growth of tumors. This study estimated the concentrations of structurally diverse isoprenoids required to inhibit the increase in a population of murine B16(F10) melanoma cells during a 48-h incubation by 50% (IC50 value). The IC50 values for d-limonene and perillyl alcohol, the monoterpenes in Phase I trials, were 450 and 250 µmol/L, respectively; related cyclic monoterpenes (perillaldehyde, carvacrol and thymol), an acyclic monoterpene (geraniol) and the end ring analog of 
-carotene (-ionone) had IC50 values in the range of 120-150 µmol/L. The IC50 value estimated for farnesol, the side-chain analog of the tocotrienols (50 µmol/L) fell midway between that of 
-tocotrienol (110 µmol/L) and those estimated for 
- (20µmol/L) and 
- (10 µmol/L) tocotrienol. A novel tocotrienol lacking methyl groups on the tocol ring proved to be extremely potent (IC50, 0.9 µmol/L). In the first of two diet studies, experimental diets were fed to weanling C57BL female mice for 10 d prior to and 28 d following the implantation of the aggressively growing and highly metastatic B16(F10) melanoma. The isomolar (116 µmol/kg diet) and the Vitamin E-equivalent (928 µmol/kg diet) substitution of d--tocotrienol for dl--tocopherol in the AIN-76A diet produced 36 and 50% retardations, respectively, in tumor growth (P < 0.05). In the second study, melanomas were established before mice were fed experimental diets formulated with 2 mmol/kg d--tocotrienol, -ionone individually and in combination. Each treatment increased (P < 0.03) the duration of host survival. Our finding that the effects of individual isoprenoids were additive suggests the possibility that one component of the anticarcinogenic action of plant-based diets is the tumor growth-suppressive action of the diverse isoprenoid constituents of fruits, vegetables and cereal grains.
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