Stereoisomers of Astaxanthin Inhibit Human Colon Cancer Cell Growth by Inducing G2/M Cell Cycle Arrest and Apoptosis

被引:40
|
作者
Liu, Xiaojuan [1 ,2 ]
Song, Mingyue [2 ]
Gao, Zili [2 ]
Cai, Xiaokun [2 ]
Dixon, William [2 ]
Chen, Xiaofeng [1 ]
Cao, Yong [1 ]
Xiao, Hang [2 ]
机构
[1] South China Agr Univ, Coll Food Sci, Dept Food Sci, Guangzhou 510642, Guangdong, Peoples R China
[2] Univ Massachusetts Amherst, Dept Food Sci, Amherst, MA 01003 USA
关键词
astaxanthin; stereoisomer; colon cancer; cell cycle; apoptosis; ALL-TRANS-ASTAXANTHIN; SIGNALING PATHWAYS; PHAFFIA-RHODOZYMA; POLYMERASE; MECHANISMS; EXTRACTION; SEPARATION; INDUCTION; STABILITY; HALLMARKS;
D O I
10.1021/acs.jafc.6b03636
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
Astaxanthin (AST) is a xanthophyll carotenoid with potential protective effects against carcinogenesis. Different stereoisomers of AST (ASTs) exist in a variety of food sources. Due to limited information on the bioactivities of ASTs, the present study investigated the inhibitory effects of ASTs on HCT116 and HT29 human colon cancer cells. ASTs investigated herein included 3S,3'S (S) from Haematococcus pluvialis, 3R,3'R (R) from Phaffia rhodozyma, and a statistical mixture (S: meso: R = 1:2:1) (M) from synthetic AST. Cell viability assay showed that ASTs all inhibited colon cancer cell growth in a time dependent (24-72 h) and dose-dependent (4-16 mu M) manner, and there was no significant difference among the IC50 values of ASTs (p > 0.05). Flow cytometry analysis indicated that ASTs induced G2/M cell cycle arrest and cellular apoptosis in cancer cells. The cell cycle arrest caused by ASTs was associated with increases in the expression levels of p21(Cip1)/(Waf1), p27, and p53, as well as decreases in the levels of CDK4 and CDK6. Meanwhile, the apoptosis induced by ASTs was confirmed by activation of caspase-3 and PARP in the cancer cells. The results indicated that hydroxyl (OH) at C3 and C3' of terminal ring structure might not be the major factor that affects the anticancer activity of AST. This study revealed important information on the inhibitory effects of ASTs on human colon cancer cells, which provided a basis for using ASTs as chemopreventiiie agents for colon cancer.
引用
收藏
页码:7750 / 7759
页数:10
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