Takahide Ota

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Loss of chromosomal integrity as well as genomic stability is considered to act as a driving force during the processes of tumorigenesis and tumor progression (1–3). Recently, two kinase genes involved in mitosis, the genes for aurora and IPL1-like midbody-associated protein kinase-1 (4,5) [AIM-1, registered in UniGene and also known as aurora1 (6) and ARK2(More)
Survivin is a component of the chromosomal passenger complex (CPC) that is essential for accurate chromosome segregation. Interfering with the function of Survivin in mitosis leads to chromosome segregation errors and defective cytokinesis. Survivin contains a Baculovirus IAP Repeat (BIR) and therefore was originally classified as inhibitor of apopotosis(More)
Nonessential tRNA modifications by methyltransferases are evolutionarily conserved and have been reported to stabilize mature tRNA molecules and prevent rapid tRNA decay (RTD). The tRNA modifying enzymes, NSUN2 and METTL1, are mammalian orthologs of yeast Trm4 and Trm8, which are required for protecting tRNA against RTD. A simultaneous overexpression of(More)
We have shown that the ginsenosides Kit, and Rh2, which are plant glycosides with a dammarane skeleton resembling a steroid skeleton as an aglycone, control the phenotypic expression of mouse B16 melanoma cells in different ways. The effects of Rh, and Rh2 on the cell surface were studied to clarify the relationship between the control of phenotypic(More)
Rho GDP-dissociation inhibitors (RhoGDIs) are regulators of Rho family GTPases. RhoGDIβ has been implicated in cancer progression, but its precise role remains unclear. We determined the subcellular localization of RhoGDIβ and examined the effects of its overexpression and RNAi knockdown in cancer cells.(More)
Rho GTPases function as molecular switches in many different signaling pathways and control a wide range of cellular processes. Rho GDP-dissociation inhibitors (RhoGDIs) regulate Rho GTPase signaling and can function as both negative and positive regulators. The role of RhoGDIs as negative regulators of Rho GTPase signaling has been extensively(More)
Etoposide is a specific inhibitor of topoisomerase II, which is an enzyme that enables double-stranded DNA to pass through another double-stranded DNA. Topoisomerase II is a major constituent of chromosome scaffold, existing at appreciable amounts in cells. To examine the effects of etoposide on the cell cycle, hexaploid H1 (ES) cells (6H1 cells) were used(More)
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