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Published in: BMC Immunology 1/2017

Open Access 01-12-2017 | Research article

The cytokine polymorphisms affecting Th1/Th2 increase the susceptibility to, and severity of, chronic ITP

Authors: Noriyuki Takahashi, Takayuki Saitoh, Nanami Gotoh, Yasuhiro Nitta, Lobna Alkebsi, Tetsuhiro Kasamatsu, Yusuke Minato, Akihiko Yokohama, Norifumi Tsukamoto, Hiroshi Handa, Hirokazu Murakami

Published in: BMC Immunology | Issue 1/2017

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Abstract

Background

T-helper cell type 1 (Th1) polarization in chronic immune thrombocytopenia (cITP) has been reported at the protein and mRNA levels. We evaluated the impact of Th1/Th2 cytokine and cytokine receptor functional polymorphisms on both susceptibility to, and severity of, cITP. We analysed IFN-γ + 874 T/A, IFN-γR -611G/A, IL-4 -590C/T, and IL-4Rα Q576R polymorphisms in 126 cITP patients (male/female: 34/92; median age: 47.7 years) and 202 healthy control donors. Genotyping was determined by PCR and direct sequencing. The Th1/Th2 ratio was detected in peripheral blood mononuclear cells via flow cytometry.

Results

cITP patients had a higher frequency of the IL-4Rα 576 non-QQ genotype compared to healthy subjects (P = 0.04). cITP patients with the IFN-γ +874 non-AA genotype (high expression type) showed more severe thrombocytopenia than those with the AA genotype (P < 0.05). cITP patients had a significantly higher Th1/Th2 ratio than control patients (P < 0.01); this ratio was inversely correlated with platelet counts. Furthermore, patients with both IFN-γ +874 non-AA genotype (high expression type) and IFN-γR −611 non-AA genotype (high-function type) had a significantly higher Th1/Th2 ratio (P < 0.05).

Conclusions

The cytokine polymorphisms affecting Th1/Th2 increase the susceptibility to, and severity of, chronic ITP.
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Metadata
Title
The cytokine polymorphisms affecting Th1/Th2 increase the susceptibility to, and severity of, chronic ITP
Authors
Noriyuki Takahashi
Takayuki Saitoh
Nanami Gotoh
Yasuhiro Nitta
Lobna Alkebsi
Tetsuhiro Kasamatsu
Yusuke Minato
Akihiko Yokohama
Norifumi Tsukamoto
Hiroshi Handa
Hirokazu Murakami
Publication date
01-12-2017
Publisher
BioMed Central
Published in
BMC Immunology / Issue 1/2017
Electronic ISSN: 1471-2172
DOI
https://doi.org/10.1186/s12865-017-0210-3

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