Volume 180, Issue 5 pp. 705-714
Research Paper

PDCD1 and CTLA4 polymorphisms affect the susceptibility to, and clinical features of, chronic immune thrombocytopenia

Tetsuhiro Kasamatsu

Corresponding Author

Tetsuhiro Kasamatsu

Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, Maebashi, Japan

These authors contributed equally to this work.

Correspondence: Tetsuhiro Kasamatsu, Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, 3-39-22 Showa-machi, Maebashi, Gunma 371-8514, Japan.

E-mail: [email protected]

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Rumi Ino

Rumi Ino

Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, Maebashi, Japan

These authors contributed equally to this work.Search for more papers by this author
Noriyuki Takahashi

Noriyuki Takahashi

Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, Maebashi, Japan

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Nanami Gotoh

Nanami Gotoh

Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, Maebashi, Japan

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Yusuke Minato

Yusuke Minato

Department of Anatomy and Cell Biology, Hyogo College of Medicine, Maebashi, Japan

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Makiko Takizawa

Makiko Takizawa

Department of Haematology, Gunma University Graduate School of Medicine, Maebashi, Japan

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Akihiko Yokohama

Akihiko Yokohama

Blood Transfusion Service, Gunma University Hospital, Maebashi, Japan

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Hiroshi Handa

Hiroshi Handa

Department of Haematology, Gunma University Graduate School of Medicine, Maebashi, Japan

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Takayuki Saitoh

Takayuki Saitoh

Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, Maebashi, Japan

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Norifumi Tsukamoto

Norifumi Tsukamoto

Oncology Centre, Gunma University Hospital, Maebashi, Japan

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Hirokazu Murakami

Hirokazu Murakami

Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, Maebashi, Japan

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First published: 23 January 2018
Citations: 26

Summary

Programmed death-1 (PD-1, PDCD1) and cytotoxic T lymphocyte-associated antigen-4 (CTLA-4, CTLA4) play central roles in immune checkpoint pathways. Single nucleotide polymorphisms (SNPs) of PDCD1 and CTLA4 have been reported to be associated with susceptibility to some autoimmune diseases. However, the potential association between SNPs in these immune checkpoint genes and risk of chronic immune thrombocytopenia (cITP) remain controversial and obscure. The aims of this study were to clarify the influence of PDCD1 and CTLA4 SNPs on the risk of developing cITP and its clinical features. We obtained genomic DNA from 119 patients with cITP and 223 healthy controls; their genotypes were determined by the polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method. Patients with cITP had a significantly higher frequency of the PDCD1 +7209 TT genotype compared with healthy controls. The CTLA4 −1577 GG genotype and CT60 GG genotype showed higher frequencies of platelet count <5 × 109/l at diagnosis, minimum platelet count <5 × 109/l, and bleeding symptoms. Moreover, the PDCD1 −606 AA genotype and +63379 TT genotype were significantly associated with a lower number of patients who achieved a complete response to prednisolone treatment. Our results suggest that the immune checkpoint polymorphisms may affect the susceptibility to the clinical features of cITP, and treatment response of the affected patients.

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