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Induction of quinone reductase by allylisothiocyanate (AITC) and the N‐acetylcysteine conjugate of AITC in Hepa1c1c7 mouse hepatoma cells
Author(s) -
Hwang EunSun,
Lee Hyong Joo
Publication year - 2006
Publication title -
biofactors
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.204
H-Index - 94
eISSN - 1872-8081
pISSN - 0951-6433
DOI - 10.1002/biof.5520260102
Subject(s) - sinigrin , glucosinolate , allyl isothiocyanate , cruciferous vegetables , chemistry , myrosinase , conjugate , biochemistry , reductase , pharmacology , enzyme , biology , botany , brassica , cancer , mathematical analysis , genetics , mathematics
Cruciferous vegetables contain a series of relatively unique secondary metabolites of amino acids, called glucosinolates, from which isothiocyanates (ITC) can be generated. While glucosinolates are not thought to be bioactive directly, ITC appear to have anticarcinogenic activity. Sinigrin, the predominant aliphatic glucosinolate in cruciferous vegetables, is hydrolyzed to yield allylisothiocyanate (AITC), which, following absorption and metabolism in humans, is excreted in the urine as an N‐acetyl‐cysteine (NAC) conjugate. AITC possesses numerous biochemical and physiological activities. This study examined the induction of quinine reductase (QR) by AITC and synthetic AITC‐NAC in Hepa1c1c7 murine hepatoma cells. AITC and AITC‐NAC inhibited cell growth in a dose‐dependent manner. The induction of QR activity and QR mRNA expression was dose‐responsive over a range of 0.1‐2.5 μM. AITC caused 2.0‐ and 3.1‐fold inductions of QR with 1‐ and 2‐μM treatments, respectively. By comparison, 1 and 2 μM AITC‐NAC caused 2.9‐ and 3.7‐fold inductions of QR, respectively. Considering the potential of ITC to prevent cancer, these results provide a basis for the use of NAC‐ITC conjugates as chemopreventive agents.