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  • 1
    In: Cancer Research, American Association for Cancer Research (AACR), Vol. 74, No. 19_Supplement ( 2014-10-01), p. 5150-5150
    Abstract: Background: JMJD3 has been known to play important roles in transcriptional regulation and cell proliferation by demethylating histone3 lysin27 (H3K27) in various cancers. However, the mechanism underlying JMJD3-mediated transcriptional regulation and the relation with prognosis were unclear in colorectal carcinoma. Here, we investigated the expression of JMJD3 in clinical samples and the function of JMJD3 in colorectal carcinoma cell lines. Methods: Quantitative real-time PCR were performed to check the expression of JMJD3 mRNA using the carcinoma and normal colorectal tissue in 14 colorectal carcinoma patients who underwent a curative surgery. In vitro analysis, we investigated the expression of JMJD3 in colorectal carcinoma cell lines by Western Blotting, and we knocked down the expression of JMJD3 by using small interfering RNA in Colo201 and colo320. The influence of JMJD3 on cell growth, apoptosis and cell cycle was assessed by growth assay, apoptosis assay and cell cycle analysis. We checked the changes of cell cycle related genes by real time PCR. Results: In clinical samples, the expression of JMJD3 in carcinoma tissue was significantly lower than in normal tissue (P=0.02). In vitro analysis, we knocked down the expression of JMJD3 by siRNA targeting JMJD3 and checked the reduction on mRNA and protein level. Knockdown of JMJD3 significantly increased cell proliferation (P=0.02), reduced apoptosis (P=0.003), and increased G2/M phase population (P = 0.05) which was detected by FACS. Moreover, knockdown of JMJD3 significantly decreased the expression of p15INK4B in quantitative real-time PCR. Conclusion: We showed the expression of JMJD3 in carcinoma tissue was lower than in normal tissue and demonstrated that the down-regulation of JMJD3 resulted in the increase of cell proliferation, acceleration of cell cycle and anti-apoptosis in vitro analysis. These results suggest that JMJD3 is a tumor suppressor gene for colorectal carcinoma. Note: This abstract was not presented at the meeting. Citation Format: Ryuma Tokunaga, Shigeki Nakagawa, Yasuo Sakamoto, Ryuichi Karashima, Satoshi Ida, Yu Imamura, Takatsugu Ishimoto, Shiro Iwagami, Yoshifumi Baba, Yuji Miyamoto, Naoya Yoshida, Hideo Baba. JMJD3 suppresses progression of colorectal carcinoma by regulating cell cycle and anti-apoptosis. [abstract]. In: Proceedings of the 105th Annual Meeting of the American Association for Cancer Research; 2014 Apr 5-9; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2014;74(19 Suppl):Abstract nr 5150. doi:10.1158/1538-7445.AM2014-5150
    Type of Medium: Online Resource
    ISSN: 0008-5472 , 1538-7445
    RVK:
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    Language: English
    Publisher: American Association for Cancer Research (AACR)
    Publication Date: 2014
    detail.hit.zdb_id: 2036785-5
    detail.hit.zdb_id: 1432-1
    detail.hit.zdb_id: 410466-3
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  • 2
    Online Resource
    Online Resource
    American Society of Clinical Oncology (ASCO) ; 2015
    In:  Journal of Clinical Oncology Vol. 33, No. 15_suppl ( 2015-05-20), p. e15035-e15035
    In: Journal of Clinical Oncology, American Society of Clinical Oncology (ASCO), Vol. 33, No. 15_suppl ( 2015-05-20), p. e15035-e15035
    Type of Medium: Online Resource
    ISSN: 0732-183X , 1527-7755
    RVK:
    RVK:
    Language: English
    Publisher: American Society of Clinical Oncology (ASCO)
    Publication Date: 2015
    detail.hit.zdb_id: 2005181-5
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  • 3
    Online Resource
    Online Resource
    American Society of Clinical Oncology (ASCO) ; 2014
    In:  Journal of Clinical Oncology Vol. 32, No. 15_suppl ( 2014-05-20), p. e15010-e15010
    In: Journal of Clinical Oncology, American Society of Clinical Oncology (ASCO), Vol. 32, No. 15_suppl ( 2014-05-20), p. e15010-e15010
    Type of Medium: Online Resource
    ISSN: 0732-183X , 1527-7755
    RVK:
    RVK:
    Language: English
    Publisher: American Society of Clinical Oncology (ASCO)
    Publication Date: 2014
    detail.hit.zdb_id: 2005181-5
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  • 4
    In: Cancer Research, American Association for Cancer Research (AACR), Vol. 74, No. 19_Supplement ( 2014-10-01), p. 420-420
    Abstract: Objective: DNA methylation is a fundamental epigenetic process that modulates gene expression. Cancer cells exhibit two types of DNA methylation alterations: global DNA hypomethylation and site-specific CpG island promoter hypermethylation. Although the base 5-methylcytosine (5mc) and the DNA methyltransferase (DNMT) family of enzymes that catalyze DNA methylation are well-studied, the mechanisms of DNA demethylation are poorly understood. The Ten-eleven translocation (Tet) family of enzymes (Tet1, Tet2, and Tet3) has been implicated in DNA demethylation. These enzymes possess the dioxygenase activity and convert 5-mC to 5-hydroxymethylcytosine (5-hmC). Frequent Tet mutational inactivation or reduction has been reported to associate with decreased 5-hmC levels in various types of myeloid leukemia and melanoma. However, the status of 5hmC and Tet expression in esophageal squamous cell carcinoma (ESCC) remains still unknown. Method: We analyzed the 5-hmC status in DNA from ESCC frozen tissues utilizing the ELISA test, and 5-hmC expression was evaluated by immunohistochemistry. We next examined the expression levels of Tet family mRNA in both normal and tumor tissues by RT-qPCR. Results: 5-hmC level was significantly lower in ESCC than in paired normal tissue in ELISA test (n=33, P & lt;0.0001). The similar result was observed in immunohistochemistry. We found that the Tet2 mRNA expression was significantly lower in ESCCs than paired normal tissues (n=32, P & lt;0.0001). The expression level of Tet2 mRNA was significantly associated with the 5hmC status (n=31, r=0.54, P=0.0085). Finally, 5-hmC status did not correlate with overall survival (P = 0.65). Conclusion: The 5hmC expression was decreased in ESCC tissues, and was associated with Tet2 expression level, suggesting that 5hmC and Tet2 might play a crucial role in the development of ESCCs. Citation Format: Asuka Murata, Yoshifumi Baba, Ryuichi Karashima, Satoshi Ida, Yu Imamura, Takatsugu Ishimoto, Shiro Iwagami, Yasuo Sakamoto, Yuji Miyamoto, Naoya Yoshida, Hideo Baba. Tet family proteins and 5-hydroxymethylcytosine in esophageal squamous cell carcinoma. [abstract]. In: Proceedings of the 105th Annual Meeting of the American Association for Cancer Research; 2014 Apr 5-9; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2014;74(19 Suppl):Abstract nr 420. doi:10.1158/1538-7445.AM2014-420
    Type of Medium: Online Resource
    ISSN: 0008-5472 , 1538-7445
    RVK:
    RVK:
    Language: English
    Publisher: American Association for Cancer Research (AACR)
    Publication Date: 2014
    detail.hit.zdb_id: 2036785-5
    detail.hit.zdb_id: 1432-1
    detail.hit.zdb_id: 410466-3
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  • 5
    In: Journal of Clinical Oncology, American Society of Clinical Oncology (ASCO), Vol. 33, No. 3_suppl ( 2015-01-20), p. 209-209
    Abstract: 209 Background: It is sometimes difficult to exactly measure maximum diameters of tumor after chemotherapy in esophageal cancer. Richard et al. proposed PET Response Criteria in Solid Tumor (PERCIST) for assessing response of tumor after chemotherapy by PET in 2009. The first purpose is to investigate the utility of PERCIST after neoadjvant chemotherapy in esophageal cancer. The second purpose is to clarify the utility of modified PERCIST of which we use the SUV of normal (non-cancerous) esophagus as a reference of comparison for diagnosing complete response (CR) instead of the right lobe liver SUV. Methods: The clinicopathological data of the 71 esophageal cancer patients who received neoadjuvant chemotherapy (DCF) and underwent curative resection from November 2008 to May 2012 were collected. Among them, we compared pathological grade with PERCIST of the 26 esophageal cancer patients who were examined by PET before and after chemotherapy. Furthermore we investigated which reference of comparison is appropriate for diagnosing complete response between the right lobe of liver (L group) and normal esophagus (E group). Results: We could measure the tumor size of all cases after chemotherapy by PERCIST although 6 cases could not be assessed by RECIST. All of the 6 cases which were diagnosed as stable disease or progressive disease by PERCIST were pathological grade1a. The cases of complete response are 7 cases in L group and 3 cases in esophageal cases. Among the complete response cases in L group, 1 case were pathological grade1 a and 2 cases were grade 2 although all the complete response cases in E group were pathological grade 3. One case of L group relapsed after curative resection although there was no recurrent case in E group. Conclusions: The esophageal cancer patients often have history of massive alcohol intake or liver damage caused by viral hepatitis or fatty liver. Although PERCIST is useful for evaluating the effect of neoadjuvant chemotherapy of esophageal cancer, it is better to use normal esophagus as a comparison standard for diagnosing complete response.
    Type of Medium: Online Resource
    ISSN: 0732-183X , 1527-7755
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    RVK:
    Language: English
    Publisher: American Society of Clinical Oncology (ASCO)
    Publication Date: 2015
    detail.hit.zdb_id: 2005181-5
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  • 6
    In: Cancer Research, American Association for Cancer Research (AACR), Vol. 74, No. 19_Supplement ( 2014-10-01), p. 4346-4346
    Abstract: Background: Bmi1 is a member of the polycomb-repressive complex 1 with an essential role in maintaining chromatin silencing. Bmi1 plays a function in the self-renewal of neuronal and hematopoietic stem cells through repression of the INK4A/ARF locus. Furthermore, Bmi1 is overexpressed in a variety of human cancers. The expression of Bmi1 is associated with poor prognosis of gastrointestinal cancer patients. On the other hand, solid tumors consist of cancer cells and various types of stromal cells, fibroblasts, endothelial cells and hematopoietic cells, mainly macrophages and lymphocytes. Tumor-associated macrophages (TAMs) contribute to tumor progression by producing various mediators. This study was performed to identify the tumor-associated macrophages (TAMs)-mediated regulation of Bmi1 expression in gastrointestinal cancers. Method: The relationship between the expression of Bmi1 and TAMs was assessed by immunohistochemistry and quantitative real-time PCR (qRT-PCR), and 3D sphere culture. Next, miRNAs microarray in gastric cancer cell co-cultured with macrophages was conducted. To examine the functional relevance of miR-30e* expression, we analyzed the relationship between miR-30e* and Bmi1 expression in high Bmi1 expressing cancer cell lines transfected with miR-30e* mimics, and low Bmi1 expressing cancer cell lines transfected with miR-30e* inhibitors. And we investigated if miR-30e* directly targets the 3′ UTR of Bmi1 using constructs containing the putative miR-30e* target site or a mutated sequence of the 3′ UTR of Bmi1 cloned immediately downstream of a luciferase gene. Furthermore Bmi1 and miR-30e* expression were assessed in cancer tissues. Results: We revealed the positive relationship between with tumor-infiltrating macrophages and Bmi1 expression in cancer cells. We showed co-culture with TAMs triggered Bmi1 expression in cancer cell lines and enhanced sphere formation ability. Based on microRNA screening analysis and in silico microRNA search, we focused on miR-30e* that could regulate Bmi1 expression. Western blot analysis revealed significantly reduced Bmi1 protein levels in high Bmi1 expressing cancer cell lines transfected with miR-30e* mimics compared with controls, and increased levels in low Bmi1 expressing cancer cell lines cells transfected with miR-30e* inhibitors compared with controls. And Bmi1 was a direct target for miR-30e* by interactions with the putative miR-30e* binding sites. MiR-30e* expression was down-regulated in tumor region compared with in non-tumor one. Furthermore Bmi1 expression was inverse correlation with miR-30e* expression. Conclusions: TAMs may cause increased Bmi1 expression through miR-30e* suppression, leading to tumor progression. Citation Format: Hidetaka Sugihara, Takatsugu Ishimoto, Daiauke Izumi, Hiroshi Sawayama, Yu Imamura, Satoshi Ida, Shiro Iwagami, Yoshifumi Baba, Yasuo Sakamoto, Yuji Miyamoto, Naoya Yoshida, Hideo Baba. Novel discovery of miR-30e* regulating Bmi1 expression induced by tumor-associated macrophages in gastrointestinal cancer. [abstract]. In: Proceedings of the 105th Annual Meeting of the American Association for Cancer Research; 2014 Apr 5-9; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2014;74(19 Suppl):Abstract nr 4346. doi:10.1158/1538-7445.AM2014-4346
    Type of Medium: Online Resource
    ISSN: 0008-5472 , 1538-7445
    RVK:
    RVK:
    Language: English
    Publisher: American Association for Cancer Research (AACR)
    Publication Date: 2014
    detail.hit.zdb_id: 2036785-5
    detail.hit.zdb_id: 1432-1
    detail.hit.zdb_id: 410466-3
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  • 7
    In: Cancer Research, American Association for Cancer Research (AACR), Vol. 74, No. 19_Supplement ( 2014-10-01), p. 185-185
    Abstract: Objectives: Gastric cancer is one of the most threatening malignancies with a high incidence and metastasis rate. Many patients are diagnosed in an advanced stage sometimes with multi-organ metastasis, which leads a poor prognosis of gastric tumors. Chemokine and their receptors have been originally demonstrated as essential mediators of leukocyte directional migration, particularly during infection and inflammation, and have further emerged as crucial players in all stages of tumor development. It has been reported that an important CXCL12-CXCR4 signaling is involved in tumor development and metastasis in several types of cancer including gastric cancer. Cancer associated fibroblasts (CAF) are reported to communicate microenvironment-derived signals through chemokine/chemokine receptor interaction such as CXCL12-CXCR4 signaling. The aim of our study was to evaluate the role of CXCL12-CXCR4 signaling in crosstalk between gastric cancer and CAF. Methods and Results: We evaluated CXCL12 and CXCR4 expression status by immunohistochemistry using a nonbiased database of 89 curatively resected gastric cancers. As a result, CXCL12/ CXCR4 expression are significant correlation with metastasis. Furthermore, we performed Western blotting analysis for CXCL12 and CXCR4 in human gastric cancer cell lines. CXCR4 expression was detectable in all gastric cancer cell lines. We isolated CAF from human gastric cancer tissue resected in our institute. We performed Western blotting analysis for alpha-SMA and CXCL12 in CAF, and confirmed higher expression in CAF than normal fibroblast (NF) isolated from normal gastric mucosa of same patients. Then we established stable AGS gastric cancer cell line expressing GFP. Invasion assay revealed that AGS (gastric cancer cell line) cells with CAF showed more invasive phenotype than that without CAF. We also found the motility of GFP-expressing AGS was elevated during direct co-culture of GFP-expressing AGS cells and CAF compared with NF. Conclusions: These findings revealed that cancer associated fibroblasts were implicated in cancer cell invasion and metastasis through CXCL12-CXCR4 signaling in gastric cancer. The therapeutic blockade of this pathway with CXCR4 antagonist might abrogate gastric cancer cell invasion and metastasis. Citation Format: Daisuke Izumi, Takatsugu Ishimoto, Hietaka Sugihara, Hiroshi Sawayama, Ryuichi Karashima, Satoshi Ida, Yu Imamura, Shiro Iwagami, Yoshifumi Baba, Yasuo Sakamoto, Yuji Miyamoto, Naoya Yoshida, Hideo Baba. Cancer associated fibroblasts stimulates cancer cell invasion through CXCL12-CXCR4 signaling in gastric cancer. [abstract]. In: Proceedings of the 105th Annual Meeting of the American Association for Cancer Research; 2014 Apr 5-9; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2014;74(19 Suppl):Abstract nr 185. doi:10.1158/1538-7445.AM2014-185
    Type of Medium: Online Resource
    ISSN: 0008-5472 , 1538-7445
    RVK:
    RVK:
    Language: English
    Publisher: American Association for Cancer Research (AACR)
    Publication Date: 2014
    detail.hit.zdb_id: 2036785-5
    detail.hit.zdb_id: 1432-1
    detail.hit.zdb_id: 410466-3
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  • 8
    Online Resource
    Online Resource
    American Society of Clinical Oncology (ASCO) ; 2014
    In:  Journal of Clinical Oncology Vol. 32, No. 15_suppl ( 2014-05-20), p. 4054-4054
    In: Journal of Clinical Oncology, American Society of Clinical Oncology (ASCO), Vol. 32, No. 15_suppl ( 2014-05-20), p. 4054-4054
    Type of Medium: Online Resource
    ISSN: 0732-183X , 1527-7755
    RVK:
    RVK:
    Language: English
    Publisher: American Society of Clinical Oncology (ASCO)
    Publication Date: 2014
    detail.hit.zdb_id: 2005181-5
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  • 9
    In: Cancer Research, American Association for Cancer Research (AACR), Vol. 74, No. 19_Supplement ( 2014-10-01), p. 1361-1361
    Abstract: Background: Lysine-specific demethylase 1 (LSD1) is the first discovered histone demethylase which specially removes H3K4me1/2 through a flavin-adenine-dinucleotide (FAD). Previous studies have indicated that LSD1 is associated with cell proliferation, cell invasion and epithelial-mesenchymal transition in human malignant tumors. Recently, it is accepted that LSD1 epigenetically regulates energy-expenditure genes in adipocytes depending on the cellular FAD availability. As a PET scan with a FDG tracer can detect cancers, the method is exceedingly useful for tumor staging or therapeutic effect determination of esophageal cancers. The aim of this study is to investigate the expression and function of LSD1 in esophageal cancer cell-lines and, to analyze the relationships between the LSD1 expression and clinicopathological data including SUVmax (standardized uptake value). Methods: The influence of LSD1 on cell proliferation and invasion was evaluated by knockdown experiments. Using 113 resected esophageal cancer specimens, we evaluated the LSD1 expression by immunohistochemistry and devided them into two groups; a low expression group (LEG) and a high expression group (HEG). We compared these two groups and analyzed the relationships between LSD1 expression and clinicopathological data. Results: In vitro analysis, knockdown of LSD1 did not impact cell proliferation, but suppressed cell invasion. In the immunohistochemical study, the HEG's age was significantly higher (P=0.021), and this group had esophageal cancers at lower locations (P=0.058). HEG was significantly correlated with the T-stage (P=0.020), lymph and blood vessels invasion (P=0.020, P=0.001), and a higher SUVmax (P=0.0088) and lower overall survival (P=0.0017). Conclusions: Our study demonstrated the relationships between the expression of LSD1 and T-stage, lymph and blood vessels invasion, and the SUVmax in esophageal cancers. It is suggested that LSD1 has a potential to impact the malignancy of the esophageal cancer, and may be a therapeutic target in patients with esophageal cancers. Citation Format: Keisuke Kosumi, Yoshifumi Baba, Ryuichi Karashima, Satoshi Ida, Yu Imamura, Takatsugu Ishimoto, Shiro Iwagami, Yasuo Sakamoto, Yuji Miyamoto, Naoya Yoshida, Akihisa Sakamoto, Shinjiro Hino, Mitsuyoshi Nakao, Hideo Baba. The clinicopathological significance of LSD1 in esophageal cancers. [abstract]. In: Proceedings of the 105th Annual Meeting of the American Association for Cancer Research; 2014 Apr 5-9; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2014;74(19 Suppl):Abstract nr 1361. doi:10.1158/1538-7445.AM2014-1361
    Type of Medium: Online Resource
    ISSN: 0008-5472 , 1538-7445
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    Language: English
    Publisher: American Association for Cancer Research (AACR)
    Publication Date: 2014
    detail.hit.zdb_id: 2036785-5
    detail.hit.zdb_id: 1432-1
    detail.hit.zdb_id: 410466-3
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  • 10
    In: Journal of Clinical Oncology, American Society of Clinical Oncology (ASCO), Vol. 32, No. 15_suppl ( 2014-05-20), p. e15020-e15020
    Type of Medium: Online Resource
    ISSN: 0732-183X , 1527-7755
    RVK:
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    Language: English
    Publisher: American Society of Clinical Oncology (ASCO)
    Publication Date: 2014
    detail.hit.zdb_id: 2005181-5
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