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Carcinogenesis, Vol 19, 605-609, Copyright © 1998 by Oxford University Press

ARTICLES

Selective increase of the potential anticarcinogen 4- methylsulphinylbutyl glucosinolate in broccoli

K Faulkner, R Mithen and G Williamson
John Innes Centre, Norwich Research Park, UK.

The putative anticarcinogenic activity of Brassica vegetables has been associated with the presence of certain glucosinolates. 4- Methylsulphinylbutyl isothiocyanate (sulphoraphane), derived from the corresponding glucosinolate found in broccoli, has previously been identified as a potent inducer of the anticarcinogenic marker enzyme quinone reductase [NADP(H):quinone-acceptor oxidoreductase] in murine hepatoma Hepa 1c1c7 cells. We have therefore produced a broccoli hybrid with increased levels of this anticarcinogenic glucosinolate and tested the ability of extracts to induce quinone reductase. A 10-fold increase in the level of 4-methylsulphinylbutyl glucosinolate was obtained by crossing broccoli cultivars with selected wild taxa of the Brassica oleracea (chromosome number, n = 9) complex. Tissue from these hybrids exhibited a >100-fold increase in the ability to induce quinone reductase in Hepa 1c1c7 cells over broccoli cultivars, due to both an increase in 4-methylsulphinylbutyl glucosinolate content and increased percentage conversion to sulphoraphane.
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