Abstract
The monoterpene D-limonene shows cancer preventative and cancer therapeutic activities in vitro and in vivo. Unlike plants, animals are unable to synthesize limonene de novo and obtain limonene through dietary sources. In the present study we established transgenic mouse embryonic NIH 3T3 fibroblast cells that produce limonene by introducing the D-limonene synthase gene obtained from Japanese catnip (Schizonepeta tenuifolia). Apoptosis was not observed in the limonene-producing cells. A concomitant increase in the level of apoptosis-related protein Bcl-2 (B-cell lymphoma protein 2) and decreases in the levels of Bad (Bcl-2 antagonist of cell death) and phosphorylated JNK (c-Jun N-terminal kinase) were observed in limonene-producing cells. Limonene-producing cells may provide a useful new system to investigate the in vivo function of this monoterpene.
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