Title |
The cytokine polymorphisms affecting Th1/Th2 increase the susceptibility to, and severity of, chronic ITP
|
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Published in |
BMC Immunology, May 2017
|
DOI | 10.1186/s12865-017-0210-3 |
Pubmed ID | |
Authors |
Noriyuki Takahashi, Takayuki Saitoh, Nanami Gotoh, Yasuhiro Nitta, Lobna Alkebsi, Tetsuhiro Kasamatsu, Yusuke Minato, Akihiko Yokohama, Norifumi Tsukamoto, Hiroshi Handa, Hirokazu Murakami |
Abstract |
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. 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). The cytokine polymorphisms affecting Th1/Th2 increase the susceptibility to, and severity of, chronic ITP. |
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