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Annals of Hematology

, Volume 97, Issue 4, pp 629–640 | Cite as

A novel heterozygous ITGB3 p.T720del inducing spontaneous activation of integrin αIIbβ3 in autosomal dominant macrothrombocytopenia with aggregation dysfunction

  • Naohiro Miyashita
  • Masahiro OnozawaEmail author
  • Koji Hayasaka
  • Takahiro Yamada
  • Ohsuke Migita
  • Kenichiro Hata
  • Kohei Okada
  • Hideki Goto
  • Masao Nakagawa
  • Daigo Hashimoto
  • Kaoru Kahata
  • Takeshi Kondo
  • Shinji Kunishima
  • Takanori Teshima
Original Article
  • 235 Downloads

Abstract

We identified a novel heterozygous ITGB3 p.T720del mutation in a pedigree with macrothrombocytopenia exhibiting aggregation dysfunction. Platelet aggregation induced by ADP and collagen was significantly reduced, while ristocetin aggregation was normal. Integrin αIIbβ3 was partially activated in a resting status, but platelet expression of αIIbβ3 was downregulated. Functional analysis using a cell line showed spontaneous phosphorylation of FAK in αIIb/β3 (p.T720del)-transfected 293T cells in suspension conditions. Abnormal cytoplasmic protrusions, membrane ruffling, and cytoplasmic localization of αIIbβ3 were observed in αIIb/β3 (p.T720del)-transfected CHO cells. Such morphological changes were reversed by treatment with an FAK inhibitor. These findings imply spontaneous, but partial, activation of αIIbβ3 followed by phosphorylation of FAK as the initial mechanism of abnormal thrombopoiesis. Internalization and decreased surface expression of αIIbβ3 would contribute to aggregation dysfunction. We reviewed the literature of congenital macrothrombocytopenia associated with heterozygous ITGA2B or ITGB3 mutations. Reported mutations were highly clustered at the membrane proximal region of αIIbβ3, which affected the critical interaction between αIIb R995 and β3 D723, resulting in a constitutionally active form of the αIIbβ3 complex. Macrothrombocytopenia caused by a heterozygous activating mutation of ITGA2B or ITGB3 at the membrane proximal region forms a distinct entity of rare congenital thrombocytopenia.

Keywords

Congenital macrothrombocytopenia FAK phosphorylation ITGB3 Integrin αIIbβ3 Platelet 

Notes

Acknowledgments

We thank Professor Kazuhiko Matsuno (Rakuno Gakuen University, Ebetsu) for kind advice for flow cytometry.

Funding

There is no financial relationship with other people or organizations that could inappropriately influence their work.

Compliance with ethical standards

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki Declaration and its later amendments. Informed consent was obtained from all patients for being included in the study. This study was approved by the Institutional Review Board of Hokkaido University Faculty of Medicine.

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Naohiro Miyashita
    • 1
  • Masahiro Onozawa
    • 1
    Email author
  • Koji Hayasaka
    • 2
  • Takahiro Yamada
    • 3
  • Ohsuke Migita
    • 4
  • Kenichiro Hata
    • 4
  • Kohei Okada
    • 1
  • Hideki Goto
    • 1
  • Masao Nakagawa
    • 1
  • Daigo Hashimoto
    • 1
  • Kaoru Kahata
    • 1
  • Takeshi Kondo
    • 1
  • Shinji Kunishima
    • 5
  • Takanori Teshima
    • 1
  1. 1.Department of HematologyHokkaido University Faculty of Medicine, Graduate School of MedicineSapporoJapan
  2. 2.Division of Laboratory and Transfusion MedicineHokkaido University HospitalSapporoJapan
  3. 3.Division of Clinical GeneticsHokkaido University HospitalSapporoJapan
  4. 4.Department of Maternal-Fetal BiologyNational Research Institute for Child Health and DevelopmentTokyoJapan
  5. 5.Department of Advanced Diagnosis, Clinical Research CenterNational Hospital Organization Nagoya Medical CenterNagoyaJapan

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