※一部利用できない機能があります
| 1.
論文 |
論文
|
Dewi, Firli R.P. ; Domoto, Takahiro ; Hazawa, Masaharu ; Kobayashi, Akiko ; Douwaki, Takayuki ; Motohashi, Hozumi ; Wong, Richard W. ; 堂本, 貴寛 ; 羽澤, 勝治 ; 小林, 亜紀子 ; 源, 利成
概要:
金沢大学がん進展制御研究所<br />Glycogen synthase kinase (GSK) 3β, which mediates fundamental cellular signaling pathways, has emerge
…
d as a potential therapeutic target for many types of cancer including colorectal cancer (CRC). During mitosis, GSK3β localizes in mitotic spindles and centrosomes, however its function is largely unknown. We previously demonstrated that translocated promoter region (TPR, a nuclear pore component) and dynein (a molecular motor) cooperatively contribute to mitotic spindle formation. Such knowledge encouraged us to investigate putative functional interactions among GSK3β, TPR, and dynein in the mitotic machinery of CRC cells. Here, we show that inhibition of GSK3β attenuated proliferation, induced cell cycle arrest at G2/M phase, and increased apoptosis of CRC cells. Morphologically, GSK3β inhibition disrupted chromosome segregation, mitotic spindle assembly, and centrosome maturation during mitosis, ultimately resulting in mitotic cell death. These changes in CRC cells were associated with decreased expression of TPR and dynein, as well as disruption of their functional colocalization with GSK3β in mitotic spindles and centrosomes. Clinically, we showed that TPR expression was increased in CRC databases and primary tumors of CRC patients. Furthermore, TPR expression in SW480 cells xenografted into mice was reduced following treatment with GSK3β inhibitors. Together, these results indicate that GSK3β sustains steady mitotic processes for proliferation of CRC cells via interaction with TPR and dynein, thereby suggesting that the therapeutic effect of GSK3β inhibition depends on induction of mitotic catastrophe in CRC cells. © Dewi et al.<br />出版社版
続きを見る
|
||||
| 2.
論文 |
論文
|
橋爪, 智恵子 ; 源, 俊成 ; Wong, Richard W. ; Hashizume, Chieko ; Minamoto, Toshinari
概要:
金沢大学がん進展制御研究所<br />出版者照会後に全文公開 | 許可を得て公開
|
||||
| 3.
論文 |
論文
|
Funasaka, Tatsuyoshi ; Tsuka, Eriko ; Wong, Richard W.
概要:
The nuclear pore complex (NPC) consists of a conserved set of ∼30 different proteins, termed nucleoporins, and serves as
…
a gateway for the exchange of materials between the cytoplasm and nucleus. Tpr (translocated promoter region) is a component of NPC that presumably localizes at intranuclear filaments. Here, we show that Tpr knockdown caused a severe reduction in the number of nuclear pores. Furthermore, our electron microscopy studies indicated a significant reduction in the number of inner nuclear filaments. In addition, Tpr siRNA treatment impaired cell growth and proliferation compared to control siRNA-treated cells. In Tpr-depleted cells, the levels of p53 and p21 proteins were enhanced. Surprisingly, Tpr depletion increased p53 nuclear accumulation and facilitated autophagy. Our study demonstrates for the first time that Tpr plays a role in autophagy through controlling HSP70 and HSF1 mRNA export, p53 trafficking with karyopherin CRM1, and potentially through direct transcriptional regulation of autophagy factors. © 2012 Macmillan Publishers Limited. All rights reserved.
続きを見る
|
||||
| 4.
論文 |
論文
|
Hashizume, Chieko ; Nakano, Hiroshi ; Yoshida, Kimihisa ; Wong, Richard W.
概要:
Nuclear pore complexes are massive multiprotein channels responsible for traffic between the nucleus and cytoplasm, and
…
are composed of approximately 30 proteins, termed nucleoporins (Nup). Our recent studies indicated that the nucleoporins Rae1 and Tpr play critical roles in maintaining the spindle bipolarity during cell division. In the present study, we found that another nucleoporin, Nup88, was localized on the spindles together with Nup214 during mitosis. Nup88 expression is linked to the progression of carcinogenesis, Nup88 has been proposed as a tumor marker. Overexpression of Nup88 enhanced multinucleated cell formation. RNAi-mediated knockdown of Nup88 disrupted Nup214 expression and localization and caused multipolar spindle phenotypes. Our data indicate that proper expression of Nup88 is critical for preventing aneuploidy formation and tumorigenesis. © 2010 Hashizume et al; licensee BioMed Central Ltd.
続きを見る
|
||||
| 5.
論文 |
論文
|
Funasaka, Tatsuyoshi ; Wong, Richard W.
概要:
金沢大学フロンティアサイエンス機構<br />One of the main reasons for cancer mortality is caused by the highly invasive behavior of cancer
…
cells, which often due to aggressive metastasis. Metastasis is mediated by various growth factors and cytokines, operating through numerous signaling pathways. Remarkably, all these metastatic signaling pathways must enter the nucleus through a single gatekeeper, the nuclear pore complex (NPC). NPCs are the only gateway between the cytoplasm and the nucleus. NPCs are among the largest proteinaceous assemblies in the cell and are composed of multiple copies of around 30 different proteins called nucleoporins. Here, we review what is currently known about the NPC, and its role in the mechanisms of tumor progression. We will also explore potential strategies to target metastatic pathways by manipulating the karyopherins (importins/exportins) of nucleocytoplasmic traffic through NPCs. © 2011 Springer Science+Business Media, LLC.
続きを見る
|
||||
| 6.
論文 |
論文
|
Funasaka, Tatsuyoshi ; Nakano, Hiroshi ; Wu, Yu ; Hashizume, Chieko ; Gu, Ling ; Nakamura, Takuro ; Wang, Wei ; Zhou, Pengbo ; Moore, Malcolm AS ; Sato, Hiroshi ; Wong, Richard W.
概要:
金沢大学フロンティアサイエンス機構<br />Chromosomal translocations involving chimeric fusions of the nucleoporin NUP98 protein have often
…
been described in acute myelogenous leukemia (AML). All the fusion proteins have an identical NUP98 N terminus, which contains the GLEBS motif for interaction with the mRNA export factor RAE1 and FG repeats that associate with the transcription factors HDAC1 and p300. It is virtually unknown whether these interaction partners affect leukemogenesis. We previously showed that RAE1 depletion caused aneuploidy, which enhanced tumorigenesis. We speculated that RAE1 may also be directly involved in NUP98 fusion-mediated leukemogenesis. We show here that RNA interference (RNAi)-mediated knockdown of NUP98 caused severe chromosome segregation defects and disrupted RAE1 but not HDAC1 expression and localization. Next, we performed rescue experiments to confirm that the RAE1-NUP98 complex orchestrates proper chromosome segregation. Interestingly, we found diverse behaviors of NUP98 and the leukemogenic fusion protein NUP98-HOXA9 throughout the cell cycle. Strikingly, in NUP98-HOXA9-transfected cells, RAE1 protein were reduced and mis-localized. Our cellular interpretations were further confirmed by NUP98-HOXA9 transgenic mice and the NUP98-HOXA9 AML patient. These data suggest that RAE1 orchestrates NUP98-mediated leukemogenesis and raise the possibility that targeting this negative feedback loop may provide a new strategy for the therapy of aggressive leukemias. © 2011 Landes Bioscience.
続きを見る
|
||||
| 7.
論文 |
論文
|
Sakr, Moustafa A. ; Takino, Takahisa ; Domoto, Takahiro ; Nakano, Hiroshi ; Wong, Richard W. ; Sasaki, Motoko ; Nakanuma, Yasuni ; Sato, Hiroshi
概要:
GI24, an immunoglobulin superfamily member, has been cloned from a placenta cDNA library as a gene product that promoted
…
activation of matrix metalloproteinase (MMP)-2 mediated by membrane type (MT) 1-MMP. Co-expression of GI24 with MT1-MMP in HEK293T cells increased the cell-surface level of MT1-MMP concomitant with the cleavage of the GI24 at the juxtamembrane site to shed the extracellular domain. HT1080 fibrosarcoma cells stably transfected with the GI24 gene expressed a higher level of MT1-MMP and showed more invasive ability in collagen gel than the control cells. GI24 was cleaved in HT1080 cells, which was blocked by the administration of MMP inhibitor BB94 or transfection of small interfering RNA (siRNA) targeting MT1-MMP. GI24 expression is relatively high in some squamous carcinoma and hepatocarcinoma cell lines. Transfection of siRNA for GI24 into oral squamous carcinoma-derived HSC-4 cells, which express GI24 and MT1-MMP genes reduced the expression of not only GI24 but also MT1-MMP, and attenuated invasive growth in the collagen matrix. These results suggest that GI24 contributes to tumor-invasive growth in the collagen matrix by augmenting cell surface MT1-MMP. (Cancer Sci 2010; 101: 2368-2374) © 2010 Japanese Cancer Association.
続きを見る
|
||||
| 8.
論文 |
論文
|
Wong, Richard W. ; Wong, Wung Chuen Richard
概要:
金沢大学 フロンティアサイエンス機構<br />核膜孔複合体(NPC)は、核-細胞質間でのタンパク質、RNA等の選択的物質輸送を制御している(橋爪ら 生化学 2011)。30種類以上あるNPCタンパク質の一つRae1(RNA export
…
factorl)は、Nup98と共にRNAを輸送することが知られている。最近の研究ではいくつかのヌクレオポリンの中には紡錘体形成、及び、有糸分裂後期開始に影響を与え、細胞の癌化に関与するものがあることが明らかになってきた(Funasaka and Wong, Cancer Metasta Rev 2011; Nakano et al., Cell Cycle 2011)。一方、研究代表者は最近、Rae1がNuMA及びSMC1と相互作用することを見出し、この相互作用の変化が多くの癌で見いだされる染色体の異数化・多極紡錘体を引き起こすことを発見した。そこで本研究課題では、Rae1-Nup98の細胞質-核間輸送、及び有糸分裂期中の詳細な機能を分子細胞生物学、及び、構造生物学の両側面から理解することを目的とした。当該年度は、急性骨髄性白血病(AML)細胞中の染色体転座に多くみられるキメラタンパク質Nup98/HoxA9を解析した。通常Nup98は、間期では核膜孔に、有糸分裂期では紡錘体に局在するが、キメラタンパク質Nup98/HoxA9は、間期では核内に、有糸分裂期では染色体上に局在が変化していた。これらのデータをまとめ論文を発表した(Funasaka et. al., Cell Cycle 2011)。また、核膜孔複合体の構造と機能についての総説を生化学に(橋爪ら 生化学 2011)、ヌクレオポリンの一つNup88についての総説を生体の科学にて発表した(橋爪ら 生体の科学2011)。さらに、AKTAタンパク質精製装置を用いて高純度のRae1タンパク質を精製することに成功することができた。<br />研究課題/領域番号:22121506, 研究期間(年度):2010 – 2011
続きを見る
|
