Carcinogenesis, Vol. 22, No. 6, 891-897,
June 2001
© 2001 Oxford University Press
MOLECULAR EPIDEMIOLOGY AND CANCER PREVENTION |
Growth inhibitory effects of diallyl disulfide on human breast cancer cell lines
1 Department of Pathology II and
2 Department of Surgery II, Kansai Medical University, Moriguchi, Osaka 570-8506, Japan
Diallyl disulfide (DADS) is an oil-soluble organosulfur compound found in garlic. The effect of synthetic DADS on the growth of estrogen receptor (ER)-positive (KPL-1 and MCF-7) and -negative (MDA-MB-231 and MKL-F) human breast cancer cell lines was examined. In an in vitro MTT assay, regardless of ER status, DADS at an IC50 of 1.8–18.1 µM after 72 h incubation caused inhibition of growth in all four cell lines examined. Growth inhibition was due to apoptosis as seen by the appearance of a sub G1 fraction. In MDA-MB-231 cells, the apoptosis cascade comprised up-regulation of Bax protein (142%), down-regulation of Bcl-XL protein (38%) and activation of caspase-3 (438%) compared with controls. In an in vivo assay by orthotopic (right thoracic mammary fat pad) transplantation of KPL-1 cells in female nude mice, intraperitoneal injection of 1 or 2 mg DADS three times a week from the day of tumor cell inoculation until the end of the experiment (after 35 days) caused growth retardation and 43% reductions in primary tumor weight, respectively, compared with DADS-untreated mice without apparent side effects. Cell proliferation as evaluated by proliferating cell nuclear antigen (PCNA)-labeling in transplanted tumor of DADS-untreated mice was 59.6%, and 1 and 2 mg DADS-treated mice was 44.6 and 44.5%, respectively. In MDA-MB-231 cells, DADS antagonized the effect of linoleic acid (LA), a potent breast cancer cell stimulator (at DADS = 1.8 µM and LA 
6.5x102 µM concentration), and synergized the effect of eicosapentaenoic acid (EPA), a potent breast cancer cell suppressor (at DADS >3 x 10–3 µM and EPA > 6.3 x 10–1 µM concentration). Thus, DADS could be a promising anticancer agent for both hormone-dependent and -independent breast cancers, and may harmonize with polyunsaturated fatty acids known as modulators of breast cancer cell growth.
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