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Cloning of Np95 gene which encodes a S-specific nuclear protein, and the sensitivity to radiation in Np95 deficient cells

Research Project

Project/Area Number 09680540
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 環境影響評価(含放射線生物学)
Research InstitutionNational Institute of Radiological Sciences

Principal Investigator

MUTO Masahiro  National Institute of Radiological Sciences, Division of Biology and Oncology, Section Head, 生物影響研究部, 研究員 (80166230)

Project Period (FY) 1997 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1999: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1998: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1997: ¥1,200,000 (Direct Cost: ¥1,200,000)
Keywordsnovel nuclear protein Np95 / PCNA / DNA replication / cell cycle / spermatogenesis / radiation sensitivity / Np95 deficient cells / Th-10a mAb / モノクローナル抗体 / ヒトホモログ / 染色体
Research Abstract

We previously produced a monoclonal antibody, Th-10a mAb, that recognizes a 95 kDa mouse nuclear protein (Np95). Np95 was stained with the Th10a mAb specifically in the S-phase of normal mouse thymocytes. In contrast, mouse T cell lymphoma cells showed a constantly high level for Np95 accumulation irrespective of cell stages during the cell cycle. To gain further insights into the physiological roles of Np95, we isolated the cDNA encoding Np95 by immunoscreening a λgt-11 cDNA expression library with the Th-10a mAb. Sequencing of the whole 3.5kb cDNA revealed that Np95 is a novel nuclear protein with an open reading frame (ORF) consisting of 782 amino acids. The ORF contains a leucine zipper motif, a zinc finger motif, a potential ATP/GTP binding site, a putative cyclin A/E-cdk2 phosphorylation site and retinoblastoma protein (Rb)-binding motifs "LXCXE" and "IXCXE". Np95 was strongly expressed in the testis, spleen and thymus, lung tissues, but not in the brain, liver and skeletal muscles. We also demonstrated that NP95 was localized in S-phase nuclei as dot-like foci. Double immunostaining of NP95 and proliferating cell nuclear antigen (PCNA) showed that NP95 was co-localized with PCNA. Construction of three-dimensional images indicated that NP95 was localized with PCNA in replication sites in a somewhat distinct temporal manner. During meiosis, NP95 was present not only in proliferating spermatogonia but also in meiotic spermatocytes and differentiating spermatids which were not proliferating. During the couse of experiments to generate a knockout mouse for NP95, we found that NP95 (-/-) embryonic stem cells had increased sensitivity to gamma-irradiation compared to the sensitivities of NP95 (+/-) and wild type embryonic stem cells. We propose that NP95 is involved in both mitotic and meiotic progression,presumably in a post-replication fashion and is a novel cell-cycle regulator that is associated with DNA fidelity maintenance.

Report

(4 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • Research Products

    (37 results)

All Other

All Publications (37 results)

  • [Publications] Fujimori A.: "Cloning and mapping of Np95 gene which encodes a novel nuclear protein associated with cell proliferation"Mammalian Genome. 9. 1032-1035 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Muto M.: "The characterization of the monoclonal Antibody Th-10a specific for a nuclear protein appearing in the S Phase of the cell cycle in normal thymocytes and its unregulated expression in lymphoma cell lines"Cell Prolif.. 28. 645-657 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Muto M.: "Analysis of Early Imitiating Event (S) in Radiation-Induced Thymic Lymphomagenesis"Jpn.J.Cancer Res.. 87. 247-257 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Chen Y.: "Cytogenetic analysis of thymocytes during early stages after irradiation in mice with different susceptibilities to radiation-induced lymphomagenesis"J. Radiat. Res.. 37. 267-276 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Araki R.: "Nonsense mutation at Try-4046 in the DNA-dependent protein kinase catalytic submit of severe combined immune deficiency mice"Proc. Natl. Acad. Sci. USA. 94. 2438-2443 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kawai H.: "Isolation and characterization of apoptosis-resistant mutants from a radiosensitive mouse lymphoma cell line"Radiat. Res.. 149. 41-51 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Uemura T.: "Temporal and Spatial Localization of Novel Nuclear Protein NP95 in Mitotic and Meiotic Cells"Cell Structure and Function. (in press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Uchimura E.: "Transient Infiltration of neutrophils into the thymus in association with apoptosis induced by whole body X-irradiation"J. Leukocyte Biology. (in press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. Muto, M. Utsuyama, T. Horiguchi, E. Kubo, T. Sado, and K. Hirokawa: "The characterization of the monoclonal Antibody Th-10a specific for a nuclear protein appearing in the S Phase of the cell cycle in normal thymocytes and its unregulated expression in lymphoma cell lines"Cell Prolif.. 28. 645-657 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. Muto, Y. Chen, E. Kubo and K. Mita: "Analysis of Early Initiating Event(s) in Radiation-Induced Thymic Lymphomagenesis"Jpn.J.Cancer Res.. 87(No.3). 247-257 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Chen, E. Kubo, T. Sado and M. Muto: "Cytogenetic analysis of thymocytes during early stages after irradiation in mice with different susceptibilities to radiation-induced lymphomagenesis"J.Radiat.Res.. 37. 267-276 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Araki, R., Fujimori, A., Hamatani., K., Mita, K., Saito, T., Mori, M., Fukumura, R., Morimiyo, M., Muto, M., Itoh, M., Tatsumi, K. and Abe, M.: "Nonsense mutation at Tyr-4046 in the DNA-dependent protein kinase catalytic subunit of severe combined immune deficiency mice"Proc.Natl.Acad.Sci.USA. 94. 2438-2443 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kawai, H., Kitamura, Y., Nikaido, O., Tatsuka, M., Hama-Inaba, H., Muto, M.. Ohyania, H. and Suzuki, F.: "Isolation and characterization of apoptosis-resistant mutants from a radiosensitive mouse lymphoma cell line"Radiat.Res.. 149. 41-51 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Fujimori, A., Matsuda, Y., Takemoto, Y., Hashimoto, Y., Kubo, E., Araki, R., Fukumura, R., Mita, K., Tatsumi, K., Muto, M.: "Cloning and mapping of Np95 gene which encodes a novel nuclear protein associated with cell proliferation"Mammalian Genome. 9. 1032-1035 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hama-Inaba, H., Wang, B., Mon, M., Matsushima, T., Saitoh, T., Takusagawa, M., Yamada, T., Muto, M., Ohyama, H.: "Radio-sensitive murine thymoma cell line 3SB : characterization of its apoptosis-resistant variants induced by repeated X-irradiation"Mutation Research. 403. 85-94 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Takatoshi Uemura, Eiko Kubo, Yasuyoshi Kanari, Toshimiti Ikemura, Kouichi Tatsumi, Masahiro Muto: "Temporal and Spatial Localization of Novel Nuclear Protein NP95 in Mitotic and Meiotic Cells"Cell Structure and Function. Vol.25, No.3(in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Eiji Uchimura, Naoko Watanabe, Otsura Niwa, Masahiro Muto, and Yoshiro Kobayashi: "Transient Infiltration of neutrophils into the thymus in association with apoptosis induced by whole body X-irradiation"J.Leukocyte Biology. (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Fujimori A.: "Cloning and mapping of Np95 gene which encodes a novel nuclear protein associated with cell proliferation"Mammalian Genome. 9. 1032-1035 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] Muto M.: "The characterization of the monoclonal Antibody Th-10a specific for a nuclear protein appearing in the S Phase of the cell cycle in normal thymocytes and its unregulated expression in Iymphoma cell lines"Cell Prolif.,. 28. 645-657 (1995)

    • Related Report
      1999 Annual Research Report
  • [Publications] Muto M.: "Analysis of Early Initiating Event(s) in Radiation-Induced Thymic Lymphomagenesis"Jpn.J.Cancer Res.. 87. 247-257 (1996)

    • Related Report
      1999 Annual Research Report
  • [Publications] Chen Y.: "Cytogenetic analysis of thymocytes during early stages after irradiation in mice with different susceptibilities to radiation-induced lymphomagenesis"J.Radiat.Res.. 37,. 267-276 (1996)

    • Related Report
      1999 Annual Research Report
  • [Publications] Araki R.: "Nonsense mutation at Tyr-4046 in the DNA-dependent protein kinase catalytic subunit of severe combined immune deficiency mice"Proc.Natl.Acad.Sci.USA.. 94. 2438-2443, (1997)

    • Related Report
      1999 Annual Research Report
  • [Publications] Kawai H.: "Isolation and characterization of apoptosis-resistant mutants from a radiosensitive mouse lymphoma cell line"Radiat.Res.. 149. 41-51, (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] Uemura T.: "Temporal and Spatial Localization of Novel Nuclear Protein NP95 in Mitotic and Meiotic Cells"Cell Structure and Function. (in press). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Uchimura E.: "Transient Infiltration of neutrophils into the thymus in association with apoptosis induced by whole body X-irradiation"J.Leukocyte Biology. (in press). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Fujimori,A.,: "Cloning and mapping of Np95 gene which encodes a novel nuclear protein associated with cell proliferation." Mammalian Genome. 9. 1032-1035 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Muto,M.: "The characterization of the monoclonal Antibody Th-10a specific for a nuclear protein appearing in the S Phase of the cell cycle in normal thymocytes and its unregulated expression in lymphoma cell lines." Cell Prolif.28. 645-657 (1995)

    • Related Report
      1998 Annual Research Report
  • [Publications] Muto,M.: "Analysis of Early Initiating Event(s)in Radiation-Induced Thymic Lymphomagenesis" Jpn.J.Cancer Res.87. 247-257 (1996)

    • Related Report
      1998 Annual Research Report
  • [Publications] Chen,Y.: "Cytogenetic analysis of thymocytes during early stages after irradiation in mice with different susceptibilities to radiation-induced lymphomagenesis." J.Radiat.Res.37. 267-276 (1996)

    • Related Report
      1998 Annual Research Report
  • [Publications] Araki,R.: "Nonsense mutation at Tyr-4046 in the DNA-dependent protein kinase catalytic submit of severe combined immune deficiency mice." Proc.Natl.Acad.Sci.USA.94. 2438-2443 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] Kawai,H.: "Isolation and characterization of apoptosis-resistant mutants from a radiosensitive mouse lymphoma cell line." Radiat.Res.149. 41-51 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Muto,M.: "The characterization of the monoclonal Antibody Th-10a specific for a nuclear protein appearing in the S Phase of the cell cycle in normal thymocytes and its unregulated expression in lymphoma cell lines." Cell Prolif.,. 28,. 645-657 (1995)

    • Related Report
      1997 Annual Research Report
  • [Publications] Muto,M.: "Analysis of Early Initiating Event(s) in Radiation-Induced Thymic Lymphomagenesis" Jpn.J.Cancer Res.,. 87. 247-257 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] Chen,Y.: "Cytogenetic analysis of thymocytes during early stages after irradiation in mice with different susceptibilities to radiation-induced lymphomagenesis." J.Radiat.Res.,. 37,. 267-276 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] Araki,R.: "Nonsense mutation at Tyr-4046 in the DNA-dependent protein kinase catalytic subunit of severe combined immune deficiency mice." Proc.Natl.Acad.Sci.USA.94,. 2438-2443, (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Kawai,H.,: "Isolation and characterization of apoptosis-resistant mutants from a radiosensitive mouse lymphoma cell line." Radiat.Res.149,. 41-51 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 武藤正弘: "放射線誘発胸腺リンパ腫の発生機構、-分子生物学的アプローチにむけて-" 放射線生物研究. 33(1). 60-78 (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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