論文 - 伊藤　佐智夫

Positive correlation between allelic loss at chromosome 14q24-31 and poor prognosis of patients with renal cell carcinoma 査読

H Kaku, S Ito, S Ebara, M Ouchida, Y Nasu, T Tsushima, H Kumon, K Shimizu

UROLOGY   64 ( 1 )   176 - 181   2004年7月

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE INC  

Objectives. To report our development of a new application of the inter-AN long polymerase chain reaction (PCR) for genomic scanning to screen for tumor-specific alterations in tumor DNA. Using this method, we detected a rearranged chromosomal region in renal cell carcinomas (RCCs). We then examined tumor-specific allelic loss in this region using microsatellite markers and determined whether a relationship was present between this allelic loss and the clinicopathologic features of the patients.
Methods. The inter-Alu long PCR genomic scan method was performed using RCC DNA samples and primers specific for a minor subset of the human repeat sequence Alu. We analyzed DNA samples from 42 pairs of matched normal and nonpapillary RCC tissues with seven microsatellite markers.
Results. The inter-Alu long PCR genomic scan method revealed an altered DNA region on chromosome 14q24-31, which is the location of several putative tumor suppressor genes. At least one of seven microsatellite markers on chromosome 14q24-31 showed loss of heterozygosity in 23 (54.8%) of 42 informative cases of RCC. The prevalent loss region was confined to a 2-Mb region around D14S67. We found a positive correlation between the presence of the loss of heterozygosity on 14q24-31 and tumor stage (P < 0.05). We also found that cases with allelic loss at 14q24-31 had a poor prognosis (P = 0.045).
Conclusions. Our inter-Alu long PCR genomic scan method is a powerful method for the screening of DNA alterations, and our data suggest that the chromosome 14q24-31 region contains likely tumor suppressor genes associated with the progression of RCC. (C) 2004 Elsevier Inc.

DOI： 10.1016/j.urology.2004.03.015

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Genome-wide analyses on loss of heterozygosity in head and neck squamous cell carcinomas 査読

LB Beder, M Gunduz, M Ouchida, K Fukushima, E Gunduz, S Ito, A Sakai, N Nagai, K Nishizaki, K Shimizu

LABORATORY INVESTIGATION   83 ( 1 )   99 - 105   2003年1月

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：LIPPINCOTT WILLIAMS & WILKINS  

Head and neck squamous cell carcinoma (HNSCC) is a frequent malignancy with a poor survival rate. Identifying the tumor suppressor gene (TSG) loci by genomic studies is an important step to uncover the molecular mechanisms involved in HNSCC pathogenesis. We therefore performed comprehensive analyses on loss of heterozygosity (LOH) using a genome-wide panel of 191 microsatellite markers in 22 HNSCC samples. We found 53 markers with significantly high LOH (>30%) on 21 chromosomal arms; the highest values of those were observed on 3p, 9p, 13q, 15q, and 17p, corresponding to D3S2432 (67%), D9S921-D9S925 (67%) and GATA62F03 (86%), D13S1493 (60%), D15S211 (62%), and D17S1353 (88%), respectively. Fifteen hot spots of LOH were defined in 13 chromosomal arms: 2q22-23, 4p15.2, 4q24-25, 5q31, Sp23, 9p23-24, 9q31.3, 9q34.2, 10q21, 11q21-22.3, 14q11-13, 14q22.3, 17p13, 18q11, and 19q12 as loci reported previously in HNSCCs. Furthermore, we identified five novel hot spots of LOH on three chromosomal arms in HNSCC at 2q33 (D2S1384), 2q37 (D2S125), 8q12-13 (D8S1136), 8q24 (D8S1128), and 15q21 (D15S211). In conclusion, our comprehensive allelotype analyses have unveiled and confirmed a total of 20 possible TSG loci that could be involved in the development of HNSCC. These results provide useful clues for identification of putative TSGs involved in HNSCC by fine mapping of the suspected regions and subsequent analysis for functional genes.

DOI： 10.1097/01.LAB.0000047489.26246.E1

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Allelic loss and reduced expression of the ING3, a candidate tumor suppressor gene at 7q31, in human head and neck cancers. 査読 国際誌

Mehmet Gunduz, Mamoru Ouchida, Kunihiro Fukushima, Sachio Ito, Yoshimi Jitsumori, Tomoko Nakashima, Noriyuki Nagai, Kazunori Nishizaki, Kenji Shimizu

Oncogene   21 ( 28 )   4462 - 70   2002年6月

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：NATURE PUBLISHING GROUP  

Loss of heterozygosity (LOH) has been frequently detected at chromosome 7q31 region in human head and neck squamous cell carcinomas (HNSCC) and many other cancers, suggesting the existence of tumor suppressor genes (TSG). We analysed LOH at 7q31 region in 49 HNSCC by using six polymorphic microsatellite markers and found allelic deletion in 48% (22/46) of the informative cases. We detected two preferentially deleted regions, one is around D7S643 and the other around D7S486. When we redefined the map of 7q31 region according to the contiguous sequences, a recently identified gene, ING3, was found in the proximity of D7S643. ING3 protein harbors the PHD domain highly homologous among ING family proteins, in which we previously found mutations in a related gene, ING1. As only one missense mutation of the ING3 gene was found in HNSCC, we examined the expression level. Reverse-transcription-PCR analysis demonstrated decreased or no expression of ING3 mRNA in 50% of primary tumors as compared with that of matched normal samples. Especially, about 63% of tongue and larynx tumors showed the decrease and a tendency of higher mortality was observed in cases with decreased ING3 expression. All these findings suggest a possibility that the ING3 gene functions as a TSG in a subset of HNSCC.

DOI： 10.1038/sj.onc.1205540

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Prognostic value of loss of heterozygosity around three candidate tumor suppressor genes on chromosome 10q in astrocytomas 査読

K Terada, T Tamiya, S Daido, H Kambara, H Tanaka, Y Ono, K Matsumoto, S Ito, M Ouchida, T Ohmoto, K Shimizu

JOURNAL OF NEURO-ONCOLOGY   58 ( 2 )   107 - 114   2002年6月

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：KLUWER ACADEMIC PUBL  

We thoroughly examined loss of heterozygosity (LOH) around three candidate tumor suppressor genes on chromosome 10q to determine whether LOH of each tumor suppressor gene is associated with the previously defined clinical prognostic indices. We also examined whether LOH can help predict prognostic variables in astrocytomas.
We selected samples from 40 astrocytomas (grades 2-4), performed Ki-67 immunostaining, and counted positive cells. Using DNA from aliquots of tumor blocks and leukocytes, we investigated LOH around the PTEN, NEURL, and DMBT1 genes (10q23.3-26.1) with the silver staining procedure. We then statistically evaluated the relationship among histological features, regional LOH on chromosome 10q, and survival. The mean survival period for patients with LOH around PTEN was 7.2 months after surgery, while that for patients without LOH around PTEN was 21.4 months. Thus, LOH around PTEN was closely associated with a reduced overall survival (p = 0.0020) but LOH at NEURL or DMBT1 was not (p > 0.05).
The combined features of an increase in histological grading and Ki-67-positive cells and the presence of LOH around PTEN significantly correlated with poor prognosis. These factors may be useful predictors of survival, and LOH analysis of tumor suppressor genes on chromosome 10q can contribute greatly to the treatment of patients with astrocytoma.

DOI： 10.1023/A:1016017711033

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Rapid and sensitive detection of physical status of human papillomavirus type 16 DNA by quantitative real-time PCR 査読

S Nagao, M Yoshinouchi, Y Miyagi, A Hongo, J Kodama, S Ito, T Kudo

JOURNAL OF CLINICAL MICROBIOLOGY   40 ( 3 )   863 - 867   2002年3月

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：AMER SOC MICROBIOLOGY  

A rapid quantitative real-time PCR method was employed to quantify the copy number of E2 and E6 genes for analysis of the physical status of human papillomavirus type 16 (HPV-16) DNA. Significant differences with respect to both copy numbers were found when more than 40% of HPV- 161 DNA was integrated with disruption of the E2 gene in an experimental model. The physical status of HPV-16 DNA in 50 clinical samples was exclusively episomal in 21 cases (42%), concomitant in 14 cases (28%), and integrated in 15 cases (30%). The prevalence of integrated and/or concomitant forms of HPV-16 DNA increased with progression of cervical disease. Four of 11 cervical intraepithelial neoplasia involved integrated forms of HPV-16 DNA partially or exclusively. This rapid, sensitive technique is useful in the analysis of the physical status of HPV DNA.

DOI： 10.1128/JCM.40.3.863-867.2002

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Effect of naturally occurring E2F-4 alterations on transcriptional activation and proliferation in transfected cells 査読

H Takashima, Y Matsumoto, N Matsubara, Y Shirakawa, R Kawashima, M Tanino, S Ito, H Isozaki, M Ouchida, SJ Meltzer, K Shimizu, N Tanaka

LABORATORY INVESTIGATION   81 ( 11 )   1565 - 1573   2001年11月

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：LIPPINCOTT WILLIAMS & WILKINS  

E2F is a family of transcription factors implicated in the regulation of gene expression required for progression through the G(1)-S transition. We have previously detected tumor-specific mutations at a trinucleotide repeat coding sequence of E2F-4 gene in a subset of human sporadic colorectal cancers. The purpose of this study was to investigate the potential functional consequences of these E2F-4 mutations. We transfected NIH3T3 fibroblasts with expression constructs containing wild-type as well as mutant E2F-4 cDNA, and the effect of the E2F-4 mutations on proliferation was examined. Alteration in transactivation of the E2F consensus promoter sequence was also examined by transient cotransfection of a E2F-4 with a DP-2 construct into cultured human cells. Transfected cell clones overexpressing mutant E2F-4 grew more rapidly and showed higher proliferative activity by increased immunohistochemical staining for proliferating cell nuclear antigen (PCNA). All three mutant forms of E2F-4 showed elevated transactivation of the E2F consensus promoter sequence. Thus, expression of mutant E2F-4s confers a growth advantage in vivo, and this effect may be related to the acquisition of a neoplastic phenotype.

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A novel WD40 repeat protein, WDC146, highly expressed during spermatogenesis in a stage-specific manner 査読

S Ito, A Sakai, T Nomura, Y Miki, M Ouchida, J Sasaki, K Shimizu

BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS   280 ( 3 )   656 - 663   2001年1月

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担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ACADEMIC PRESS INC ELSEVIER SCIENCE  

We have cloned a novel cDNA encoding a protein with eight WD repeat motifs and a domain similar to collagen. As the predicted size of the protein was 146 kDa, the gene was named WDC146. Here, we characterized the genomic structure, gene products, and the expression profiles. The human WDC146 gene had 22 exons spanning over 105 kb, and these exons were distributed in three islands intervened by two long introns of around 40 kb. A minimum promoter region was identified within a 0.5 kb 5'-upstream region of exon 1. WDC146 mRNA was most highly expressed in human testis on Northern blot analysis. In mouse tissues, the highest expression was also observed in testis. By in situ hybridization on rat tissues, WDC146 mRNA was detected preferentially in the pachytene stage of spermatocytes in testis, and weakly in white pulp/marginal band of spleen and in cortex of thymus. WDC146 protein was found to be localized in nucleus. These data implied that WDC146 protein may play important roles in the mechanisms of cytodifferentiation and/or DNA recombination. (C) 2001 Academic Press.

DOI： 10.1006/bbrc.2000.4163

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Analysis by multiplex PCR of the physical status of human papillomavirus type 16 DNA in cervical cancers 査読

M Yoshinouchi, A Hongo, K Nakamura, J Kodama, S Ito, H Sakai, T Kudo

JOURNAL OF CLINICAL MICROBIOLOGY   37 ( 11 )   3514 - 3517   1999年11月

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：AMER SOC MICROBIOLOGY  

Integration of human papillomavirus (HPV) DNA occurs early in cancer development and is an important event in malignant transformation of cervical cancer. Integration of HPVs preferentially disrupts or deletes the E2 open reading frame, which results in the loss of its expression, The preferential disruption of the E2 gene causes the absence of the E2 gene sequences in the PCR product following integration. Twenty-two carcinomas positive for HPV type 16 (HPV-16) DNA mere first tested far the disruption of the E2 gene by PCR. A specific fragment of the E2 gene was not amplified in 10 cases, suggesting integration of HPV DNA into the host genome. Next, multiplex PCR for the RPV E2 and E6 genes was carried out in the remaining 12 cases. Copy numbers of both genes should he equivalent in episomal forms, while the E2 gene copy number will be smaller than that for E6 following the preferential disruption of the E2 gene in concominant forms. Although relative ratios of HPV E2 to E6 PCR products (E2/E6 ratios) ranged from 1.40 to 2.34 in 10 of 12 cases, multiplex PCR products from 2 cases displayed extremely low ratios of 0.69 and 0.61, Southern blot hybridization with an HPV-16 probe revealed that only in these two cases was both episomal and integrated HPV DNA being carried simultaneously. Thus, multiplex PCR for the E2 and E6 genes of HPV-16 DNA following PCR for the E2 gene can distinguish the pure episomal form from a mixed form of episomal and integrated HPV DNA, Clinical application of this technique mill help researchers to understand the implication of the integration of HPV DNA for cervical carcinogenesis and cervical cancer progression.

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