Hesperidin induces apoptosis and triggers autophagic markers through inhibition of Aurora-A mediated phosphoinositide-3-kinase/Akt/mammalian target of rapamycin and glycogen synthase kinase-3 beta signalling cascades in experimental colon carcinogenesis

被引：114
作者：
Saiprasad, Gowrikumar [1 ]
Chitra, Palanivel [1 ]
Manikandan, Ramar [2 ]
Sudhandiran, Ganapasam [1 ]
机构：
[1] Univ Madras, Dept Biochem, Cell Biol Lab, Madras 600025, Tamil Nadu, India
[2] Univ Madras, Dept Zool, Madras 600025, Tamil Nadu, India
来源：
EUROPEAN JOURNAL OF CANCER | 2014年 / 50卷 / 14期
关键词：
Colon cancer; Apoptosis; PI3K; Autophagy; mTOR; GSK-3; beta; Aurora-A; COLORECTAL-CANCER; CELL-SURVIVAL; ACTIVATION; PATHWAYS; CYCLE; P21; P53;
D O I：
10.1016/j.ejca.2014.06.013
中图分类号：
R73 [肿瘤学];
学科分类号：
100214 ;
摘要：
Abnormalities in the homeostasis mechanisms involved in cell survival and apoptosis are contributing factors for colon carcinogenesis. Interventions of these mechanisms by pharmacologically safer agents gain predominance in colon cancer prevention. We previously reported the chemopreventive efficacy of hesperidin against colon carcinogenesis. In the present study, we aimed at investigating the potential of hesperidin over the abrogated Aurora-A coupled pro-survival phosphoinositide-3-kinase (PI3K)/Akt signalling cascades. Further, the role of hesperidin over apoptosis and mammalian target of rapamycin (mTOR) mediated autophagic responses were studied. Azoxymethane (AOM) induced mouse model of colon carcinogenesis was involved in this study. Hesperidin treatment was provided either in initiation/post-initiation mode respectively. Hesperidin significantly altered AOM mediated anti-apoptotic scenario by modulating Bax/Bcl-2 ratio together with enhanced cytochromec release and caspase-3, 9 activations. In addition, hesperidin enhanced p53-p21 axis with concomitant decrease in cell cycle regulator. Hesperidin treatment caused significant up-regulation of tumour suppressor phosphatase and tensin homologue (PTEN) with a reduction in the expression of AOM mediated p-PI3K and p-Akt. Additionally, hesperidin administration exhibited inhibition against p-mTOR expression which in turn led to stimulation of autophagic markers Beclin-1 and LC3-II. Aurora-A an upstream regulator of PI3K/Akt pathway was significantly inhibited by hesperidin. Furthermore, hesperidin administration restored glycogen synthase kinase-3 beta (GSK-3 beta) activity which in turn prevented the accumulation of oncoproteins beta-catenin, c-jun and c-myc. Taken together, hesperidin supplementation initiated apoptosis via targeted inhibition of constitutively activated Aurora-A mediated PI3K/Akt/GSK-3 beta and mTOR pathways coupled with autophagic stimulation against AOM induced colon carcinogenesis. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2489 / 2507
页数：19
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