title: Rare sugar D-allose induces specific up-regulation of TXNIP and subsequent G1 cell cycle arrest in hepatocellular carcinoma cells by stabilization of p27kip1.
abstract: 'Rare sugars' are defined as monosaccharides that exist in nature but are only present in limited quantities. The development of mass production method of rare sugars revealed some interesting physiological effects of these on animal cells, but the mechanisms have not been well studied. We examined the effect of D-allose on the proliferation of cancer cells and the underlying molecular mechanism of the action. The HuH-7 hepatocellular carcinoma cells were treated with various monosaccharides for 48 h and D-allose was shown to inhibit cell growth by 40% in a dose-dependent manner. D-allose induced G1 cell cycle arrest but not apoptosis. The microarray analysis revealed that D-allose significantly up-regulated thioredoxin interacting protein (TXNIP) gene expression, which is often suppressed in tumor cells and western blot analysis confirmed its increase at protein level. The overexpression of TXNIP also induced G1 cell cycle arrest. Analysis of cell cycle regulatory genes showed p27kip1, a key regulator of G1/S cell cycle transition, to be increased at the protein but not the transcriptional level. Protein interaction between TXNIP and jab1, and p27kip1 and jab1, was observed, suggesting stabilization of p27kip1 protein by the competitive inhibition of jab1-mediated nuclear export of p27kip1 by TXNIP. In addition, increased interaction and nuclear localization of TXNIP and p27kip1 were apparent after D-allose treatment. Our findings surprisingly suggest that D-allose, a simple monosaccharide, may act as a novel anticancer agent via unique TXNIP induction and p27kip1 protein stabilization.
authors.affiliation: Department of Cell Physiology, Faculty of Medicine, Kagawa University, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa 761-0793, Japan.
authors.forename: Fuminori
authors.initials: F
authors.lastname: Yamaguchi
authors.forename: Maki
authors.initials: M
authors.lastname: Takata
authors.forename: Kazuyo
authors.initials: K
authors.lastname: Kamitori
authors.forename: Machiko
authors.initials: M
authors.lastname: Nonaka
authors.forename: Youyi
authors.initials: Y
authors.lastname: Dong
authors.forename: Li
authors.initials: L
authors.lastname: Sui
authors.forename: Masaaki
authors.initials: M
authors.lastname: Tokuda
mesh_terms: D000970:Antineoplastic Agents / Q000494:pharmacology; D006528:Carcinoma, Hepatocellular / Q000378:metabolism*; D002352:Carrier Proteins / Q000096:biosynthesis*; D002453:Cell Cycle / Q000187:drug effects; D018797:Cell Cycle Proteins / Q000378:metabolism; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D050760:Cyclin-Dependent Kinase Inhibitor p27 / Q000096:biosynthesis*; D016193:G1 Phase; D015972:Gene Expression Regulation, Neoplastic; D005947:Glucose / Q000494:pharmacology*; D006801:Humans; D008113:Liver Neoplasms / Q000378:metabolism*; D008954:Models, Biological; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D000970:Antineoplastic Agents; D002352:Carrier Proteins; D018797:Cell Cycle Proteins; C486715:TXNIP protein, human; D050760:Cyclin-Dependent Kinase Inhibitor p27; C002055:allose; D005947:Glucose