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Characterization of PROX1, a novel tumor suppressor gene.

Research Project

Project/Area Number 18590730
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Gastroenterology
Research InstitutionKyoto University

Principal Investigator

TAKAHASHI Meiko  Kyoto University, Center for Genomic Medicine, Assistant Professor (20372592)

Project Period (FY) 2006 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥3,890,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥390,000)
Fiscal Year 2007: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2006: ¥2,200,000 (Direct Cost: ¥2,200,000)
KeywordsPROX1 / Tumor suppressor gene / RNA editing / Prox1
Research Abstract

Characterization of PROX1 in HCC
To address the possibility that Prox1 may be involved in the tumorigenesis of hepatocellular carcinoma (HCC), human clinical samples were analyzed. There was a significant correlation between Prox1 expression and the differentiation scores of the tumors, and low expression of Prox1 in tumors was closely associated with a poor prognosis. The specific knockdown of Prox1 by RNA interference strongly accelerated in vitro cell growth, whereas the overexpression of Prox1 greatly suppressed the growth. Our results suggest that Prox1 is involved in the differentiation and progression of HCC, and thus it may be a candidate for the development of novel diagnostic and therapeutic strategies for HCC.
Functional Analyses of PROX1
The importance of genetic mutations in carcinogenesis has been recognized, and it has been proposed that aberrant mutation of mRNA may represent a novel oncogenic principle. Expression of Prox1 was reduced in pancreatic cancers, and the extent … More of reduction correlated with progression of tumor differentiation. A-to-G base change was found in prox1 cDNA taken from human cancer cells, but not in corresponding genomic DNA. We mapped four common mutation sites in prox1 gene, and the same four sites were mutated in human clinical samples from several cancers. Tetracycline-induced wild-type (wt) Prox1 in tumor cells inhibited transforming activity and cellular proliferation. However, mutant Prox1 with the four common sites altered from A to G lost these inhibitory functions. In mice, xenografts of tumor cells with tetracycline-induced wt-Prox1 formed tumor masses significantly more slowly than control tumors, whereas mutated Prox1 had no effect. These findings may point to a pivotal role of the RNA mutation of prox1 gene in the pathogenesis of human cancer progression.
RNA mutation detection system
We applied the shifted termination assay (STA) for detection of an A-to-I RNA mutation (R334G) in prox1, and demonstrated that the STA method can be used to identify not only genomic mutations but also RNA mutations more effectively compared to sequencing. By means of STA, we found prox1 R334G RNA mutations but not genomic DNA mutations in 4 of 8 cases of esophageal cancers. This method can help us to detect RNA mutation effectively and progress research of a potential oncogenic principle. Less

Report

(3 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • Research Products

    (20 results)

All 2007 2006

All Journal Article (18 results) (of which Peer Reviewed: 9 results) Presentation (2 results)

  • [Journal Article] RNA mutations of prox1 detected in human esophageal cancer cells by the shifted termination assay.2007

    • Author(s)
      Yoshimoto T, Takahashi M, Nagayama S, Watanabe G, Shimada Y, Sakasi Y, Kubo H.
    • Journal Title

      Biochem Biophys Res Commun 359(2)

      Pages: 258-262

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Immunohistochemical detection of the lymphatic marker podoplanin in diverse types of human cancer cells using a novel antibody.2007

    • Author(s)
      Kono T, Shimoda M, Takahashi M, Matsumoto K, Yoshimoto T, Mizutani M, Tabata C, Okoshi K, Wada H, Kubo H.
    • Journal Title

      Int J Oncol 31(3)

      Pages: 501-508

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Thalidomide prevents bleomycin-induced pulmonary fibrosis in mice.2007

    • Author(s)
      Tabata C, Tabata R, Kadokawa Y, Hisamori S, Takahashi M, Mishima M, Nakano T, Kubo H.
    • Journal Title

      J Immunol. 179(1)

      Pages: 708-714

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] RNA mutations of prox1 detected in human esophageal cancer cells by the shifted termination assay2007

    • Author(s)
      Yoshimoto, T., Takahashi, M., Nagayama, S., Watanabe, G., Shimada, Y., Sakasi, Y., Kubo, H
    • Journal Title

      Biochem Biophys Res Commun 359(2)

      Pages: 258-262

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Immunohistochemical detection of the lymphatic marker podoplanin in diverse types of human cancer cells using a novel antibody2007

    • Author(s)
      Kono, T., Shimoda, M., Takahashi, M., Matsumoto, K., Yoshimoto, T., Mizutani, M., Tabata, C., Okoshi, K., Wada, H., Kubo, H
    • Journal Title

      Int J Oncol 31(3)

      Pages: 501-508

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Thalidomide prevents bleomycin-induced pulmonary fibrosis in mice2007

    • Author(s)
      Tabata, C., Tabata, R., Kadokawa, Y., Hisamori, S., Takahashi, M., Mishima, M., Nakano, T., Kubo, H
    • Journal Title

      J Immunol 179(1)

      Pages: 708-714

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] RNA mutations of proxl detected in human esophageal cancer cells by the shifted termination assay2007

    • Author(s)
      Yoshimoto T, Takahashi M, Nagayama S, Watanabe G, Shimada Y, Sakasi Y, Kubo H.
    • Journal Title

      Biochem Biophys Res Commun 359(2)

      Pages: 258-262

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Immunohistochemical detection of the lymphatic marker podoplanin in diverse types of human cancer cells using a novel antibody2007

    • Author(s)
      Kono T, Shimoda M, Takahashi M, Matsumoto K, Yoshimoto T, Mizutani M, Tabata C, Okoshi K, Wada H, Kubo H
    • Journal Title

      Int J Oncol. 31(3)

      Pages: 501-508

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Thalidomide prevents bleomycin-induced pulmonary fibrosis in mice2007

    • Author(s)
      Tabata C, Tabata R, Kadokawa Y, Hisamori S, Takahashi M, Mishima M, Nakano T, Kubo H
    • Journal Title

      J Immunol. 179(1)

      Pages: 708-714

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A homeobox protein proxl is involved in the differentiation, proliferation and prognosis in hepatocellular carcinoma.2006

    • Author(s)
      Shimoda M, Takahashi M, Yoshimoto T, Kono T, Ikai I, Kubo H.
    • Journal Title

      Clin Can Res 12(20)

      Pages: 6005-6011

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Loss of function of the candidate tumor suppressor proxl by RNA mutation in human cancer cells.2006

    • Author(s)
      Takahashi M, Yoshimoto T, Shimoda M, Kono T, Koisumi M, Yazumi S, Shimada Y, Doi R, Chiba T, Kubo H.
    • Journal Title

      Neoplasia 8(12)

      Pages: 1003-1010

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Differentiation of lymphatic endothelial cells from Embryonic Stem cells on OP9 stromal cells.2006

    • Author(s)
      Kono T, Kubo H, Shimazu C, Ueda Y, Takahashi M, Yanagi K, Fujita N, Tsuruo T, Wada H, Yamashita JK.
    • Journal Title

      Arterioscler Thromb Vasc Biol Sep;26(9)

      Pages: 2070-2076

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] A homeobox protein prox1 is involved in the differentiation, proliferation and prognosis in hepatocellular carcinoma2006

    • Author(s)
      Shimoda, M., Takahashi, M., Yoshimoto, T., Kono, T., Ikai, I., Kubo, H
    • Journal Title

      Clin Can Res 12(20)

      Pages: 6005-6011

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Loss of function of the candidate tumor suppressor prox1 by RNA mutation in human cancer cells2006

    • Author(s)
      Takahashi, M., Yoshimoto, T., Shimoda, M., Kono, T., Koisumi, M., Yazumi, S., Shimada, Y., Doi, R., Chiba, T., Kubo, H
    • Journal Title

      Neoplasia 8(12)

      Pages: 1003-1010

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Differentiation of lymphatic endothelial cells from Embryonic Stem cells on OP9 stromal cells2006

    • Author(s)
      Kono, T., Kubo, H., Shimazu, C., Ueda, Y., Takahashi, M., Yanagi, K., Fujita, N., Tsuruo, T., Wada, H., Yamashita, JK
    • Journal Title

      Arterioscler Thromb Vase Biol 26(9)

      Pages: 2070-2076

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Loss of function of the candidate tumor suppressor proxl by RNA mutation in human cancer cells.2006

    • Author(s)
      Takahashi, M., Yoshimoto, T., Shimoda, M., Kono, T., Koisumi, M., Yazumi, S., Shimada, Y., Doi, R., Chiba, T., Kubo, H
    • Journal Title

      Neoplasia 8(12)

      Pages: 1003-1010

    • Related Report
      2006 Annual Research Report
  • [Journal Article] A homeobox protein proxl is involved in the differentiation, proliferation and prognosis in hepatocellular carcinoma2006

    • Author(s)
      Shimoda, M., Takahashi, M., Yoshimoto, T., Kono, T, Ikai, I., Kubo, H
    • Journal Title

      Clin Can Res 12 (20)

      Pages: 6005-6011

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Differentiation of lymphatic endothelial cells from Embryonic Stem cells on OP9 stromal cells.2006

    • Author(s)
      Kono, T., Kubo, H., Shimazu, C., Ueda Y., Takahashi, M., Yanagi, K., Fujita, N., Tsuruo, T., Wada, H., Yamashita.JK
    • Journal Title

      Arterioscler Thromb Vasc Biol Sep;26 (9)

      Pages: 2070-2076

    • Related Report
      2006 Annual Research Report
  • [Presentation] A-to-I RNA editing of a homeobox gene in a subset of human cancer cells2006

    • Author(s)
      Takahashi M, Yoshimoto T, Kubo H.
    • Organizer
      11th International Congress f Metastasis Research Society jointed with 15th Annual Meeting of Japanese Association for Metastasis Research
    • Place of Presentation
      Tokushima, Japan
    • Year and Date
      2006-09-05
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] A-to-I editing of a homeobox gene in a subset of human cancer cells2006

    • Author(s)
      Takahashi, M., Yoshimoto, T., Kubo, H
    • Organizer
      11th International Congress of Metastasis Research Society jointed with 16th Annual Meeting of Japanese Association for Metastasis Research
    • Place of Presentation
      Tokushima, Japan
    • Year and Date
      2006-09-05
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary

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Published: 2006-04-01   Modified: 2016-04-21  

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