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Establishment of a sensitive method for detection of PIG-A mutations, and some applications for molecular studies of paroxysual necturnal hemoglobinuric

Research Project

Project/Area Number 12670985
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Hematology
Research InstitutionOsaka University

Principal Investigator

MACHII Takashi  Osaka Univ., Graduate School of Medicine, Associate Prof., 医学系研究科, 助教授 (50124780)

Co-Investigator(Kenkyū-buntansha) KONAKURA Yuzuru  Osaka Univ., Graduate School of Medicine, Professor, 医学系研究科, 教授 (20177489)
MIZUKI Masao  Osaka Univ., Graduate School of Medicine, Assistant Prof., 医学系研究科, 助手 (80283761)
SHIBAYAMS Hirohiko  Osaka University Hospital, Medical Staff, 医学部附属病院, 医員(臨床研究) (60346202)
池田 弘和  大阪大学, 医学系研究科, 助手 (10311755)
Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2001: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2000: ¥2,200,000 (Direct Cost: ¥2,200,000)
KeywordsPNH / PIG-A / GPI-anchor / CD59 / bone marorow failure / Aplastic anemia / clonal expansion / missense mutation / 造血幹細胞 / HMGA2 / PIG-A遺伝子 / レトロウイルスベクター
Research Abstract

A new sensitive method detecting PIG-A mutations was established, particularly, for those in small population of GPI-anchored protein (GPI-AP) deficient cells. We also established a sensitive CD59 assay. We conducted molecular studies for understanding the pathogenesis and pathophysiology of PNH, as described below. The methods were used in some of these experiments.
1. Small populations of CD59 deficient erythrocytes was detected in some patients with aplastic anemia (AA), or MDS, who have no significant abnormalities by the standard flow cytometry, and in some normal individuals.
2. We reanalyzed PIG-A gene in 9 patients with PNH, 6-9 years after initial examinations. In all of the patients, the previously dominant clone was still present and dominant in the present study, indicating one stem cell clone can sustain hematopoiesis for 6-9 years in patients with PNH.
3. Structural and functional analysis of the PIG-A missense mutations found in patients with PNH, showed that the genotype and phenotype were practically consistent with each other. Defective interaction of the PIG-A protein with PIG-H, GPI- 1, and/or PIG-P was recognized in 4 different missenses.
4. Cross culture experiments showed that the hematopoietic defect in PNH is not due to defective stroma, but is due to defective progenitor cell growth related to additional unknown factors.
5. To develop a gene therapy for PNH, a retroviral vector construct (MPIN) was made, containing the PIG-A complementary DNA and NGFR as a marker. Efficient and stable functional restoration of GPI-APs was seen in a variety of PIG-A-deficient hematopoietic cell types by MPIN transduction. MPIN was also transduced in BMMNC from a patient with PNH, and the cells restored surface expression of GPI-AP

Report

(3 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] Yamaguchi M, Machii T et al.: "Detection of small populations of CD59-deficient erythrocytes in patients with aplitic amemlo or medleys plastic syndrome and normal individuals"Blood cools Molecules, and Diseases. 26. 247-254 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Nishimura J, Mochii T et al.: "Efficient retrovirus-inedited PIG-A gene transfer and stable restoration of GPI-audrored protein expression in cells with PNH phenotype"Blood. 97. 3004-3010 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Nishimura J, Machii T et al.: "Long term support of Remotopoiesis by a single stem cell alone in patients with PNH"Blood. 99. 2748-2751 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Nishimura J, Machii T et al.: "The hematopoietic defect in PNH is not duo to defective stroma bt is due to dofective progenitor cells"Blood. (in press). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 待井隆志: "補体の功罪"綜合臨床. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Inoue N, Machii T et al.: "A possible intrinsic mechanism for clonol expression of PNH abnormal cells"Paroxysmal Nocturnal hemoglohinuria : molecules aspects of pathogenesis Comine M, Kinoshita T (Eds) (Spiringer-Verlog). (in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Yamaguchi M, Machii T, Azenishi Y et al.: "Detection of small populations of CD59-deficient erythrocyts in patients with aplastic anemia or myelodysplastic syndrome and normal individuals"Blood cells, Molecules, and Diseases. 26. 247-254 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Nishimura J, Machii T, Smith CA et al.: "Efficient retrovirus-mediated PIG-A gene transfer and stable restoration of GPI-anchored protein expression in cells with PNH phenotype"Blood. 97. 3004-3010 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Nishimura J, Machii T, Kinoshita T et al.: "Long-term support of hematopoiesis by a single stem cell clone in patients with PNH"Blood. 99. 2748-51 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Inoue N, Machii T, Kanekura Y et al.: "A possible intrinsic mecanism for clonal expression of PNH abnormal cells"Omine M, Kinoshita T (Eds.) in paroxysmal nocturnal hemoglobinuria and related disorers ; molecular aspects of pathogenesis (Springer-Verlag). (in press). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Nishimura J, Machii T, Rosse WF: "The Hematopoietic defect in PNH is not due to defective stroma, but is due to defective progenitor cells"Blood Cells Mol Dis. (in press). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Nishimura J et al.: "Efficient retrovirus -mediated PIG-A gene transfer and stable restoration of GPI-anchored protein expression"Blood. 97・10. 3004-3010 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Nishimura J et al.: "Long-term support of hematopoiesis by a single stem cell clone in patients with PNH"Blood. 99・8(in press). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] 待井隆志: "発作性夜間血色素尿症"綜合臨牀. (印刷中). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] 待井隆志他: "阿部達生編、専門医を目指すケース・メソッド・アプローチ:血液疾患"日本医事新報社(印刷中). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] 弘田稔幸 他: "PNH患者における同一変異クローンによる長期間にわたる造血の維持"補体シンポジウム・日本生体防御学会合同学術集会 講演集. 23-24 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 桑山真輝 他: "発作性夜間血色素尿患者にみうれるミスセンス変異をもつPIG-A蛋白の機能的分類"補体シンポジウム・日本生体防御学会合同学術集会 講演集. 25-26 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Yamaguchi M et al: "Detection of small populations of CD59-deficient erythrocytes in patients with aplastic anemia or myelodysplastic syndrome and normal individuals."Blood Cells, Mokcules, and Diseases. 26・3. 247-254 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Nishimura J et al: "Efficient retrovirus-mediated PIG-A gene transfer and stable restoration of GPI-anchored expression in cells with PNH phenotype"Blood. (in press).

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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