Carcinogenesis, Vol. 22, No. 8, 1155-1161,
August 2001
© 2001 Oxford University Press
CANCER BIOLOGY |
Effects of the garlic compound diallyl disulfide on the metabolism, adherence and cell cycle of HT-29 colon carcinoma cells: evidence of sensitive and resistant sub-populations
Laboratoire de Nutrition et Sécurité Alimentaire, Institut National de la Recherche Agronomique, 78350 Jouy-en-Josas, France
Diallyl disulfide (DADS) is a major organosulphur compound present in garlic with an anti-mitotic potential against colon neoplasic lesions in vivo and colon tumour cell growth in vitro. Using the human colon adenocarcinoma HT-29 Glc–/+ cell line we identified sub-populations of tumoural cells with markedly different characteristics in terms of metabolic capacities, adhesion properties and distribution in the cell cycle phases. After 1 and 2 days treatment with 100 µM DADS HT-29 cells were largely released into the culture medium. These floating cells accumulated in the G2/M phase and were characterized by a 5-fold reduction in cell capacity for de novo protein synthesis. Polyamine metabolism, which is necessary for intestinal epithelial cell attachment and growth, was also severely affected, since 3-fold reductions in polyamine biosynthesis and net accumulation of putrescine were measured after DADS treatment. However, oxidation of L-glutamine, the main precursor of the tricarboxylic acid cycle in these cells, and de novo synthesis of glutathione, a tripeptide involved in tumoural cell chemoresistance, were not affected by DADS treatment. In contrast, the adherent sub-population of HT-29 cells, although partially accumulated in G2/M phase, were characterized by unaffected metabolic capacities when compared with control cells except for putrescine accumulation, which was transiently decreased, and L-glutamine oxidation, which was increased 2-fold. DADS-resistant cells selected within 5 days were then able to proliferate at a similar rate to control untreated cells. The DADS-induced changes in HT-29 metabolic capacities, adhesion properties and the cell cycle are discussed from a causal perspective.
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