title: Anticancer effects of diallyl trisulfide derived from garlic.
abstract: Alk(en)yl sulfides are characteristic flavor components of garlic. Several lines of epidemiological study indicate that the risk of a certain cancer can be prevented by consumption of garlic. In this manuscript, we examined the anticancer property of garlic-derived alk(en)yl sulfides, and the molecular basis especially for diallyl trisulfide which is a major constituent of the garlic oil. Alk(en)yl sulfides with different numbers of sulfur atom (i.e., mono-, di-, and trisulfide) were synthesized and purified (>99%). The anticancer activity of the alk(en)yl sulfides was primarily examined using human colon cancer cells HCT-15 and DLD-1. The growth of the cells was significantly suppressed by diallyl trisulfide, but neither diallyl monosulfide nor diallyl disulfide showed such an effect. The number of cells arrested at G2/M phase, the cells with a sub-G1 DNA content, and the cells with caspase-3 activity were dramatically increased by diallyl trisulfide treatment. Diallyl trisulfide disrupted microtubule network formation of the cells, and microtubule fragments could be seen at the interphase. There was a specific oxidative modification of cysteine residues Cys12 beta and Cys354 beta, forming S-allylmercaptocysteines in the tubulin molecule. These results suggest that diallyl trisulfide is responsible, at least in part, for the epidemiologically proven anticancer effect for garlic eaters.
authors.affiliation: Laboratory of Nutrition and Physiology, Department of Applied Life Sciences, Nihon University Graduate School of Bioresource Sciences, Kameino 1866, Fujisawa, Kanagawa 252-8510, Japan. tseki@brs.nihon-u.ac.jp
authors.forename: Taiichiro
authors.initials: T
authors.lastname: Seki
authors.forename: Takashi
authors.initials: T
authors.lastname: Hosono
authors.forename: Tomomi
authors.initials: T
authors.lastname: Hosono-Fukao
authors.forename: Kahoru
authors.initials: K
authors.lastname: Inada
authors.forename: Rie
authors.initials: R
authors.lastname: Tanaka
authors.forename: Jun
authors.initials: J
authors.lastname: Ogihara
authors.forename: Toyohiko
authors.initials: T
authors.lastname: Ariga
mesh_terms: D000498:Allyl Compounds / Q000494:pharmacology*; D000972:Antineoplastic Agents, Phytogenic / Q000494:pharmacology*; D017209:Apoptosis; D002453:Cell Cycle / Q000187:drug effects; D045744:Cell Line, Tumor; D005737:Garlic / Q000737:chemistry*; D006801:Humans; D008870:Microtubules / Q000187:drug effects / Q000648:ultrastructure; D009369:Neoplasms / Q000188:drug therapy*; D013440:Sulfides / Q000494:pharmacology*
chemical_list: D000498:Allyl Compounds; D000972:Antineoplastic Agents, Phytogenic; D013440:Sulfides; C042577:diallyl trisulfide