Abstract：Objective To study the expression of leukocyte-associated Ig-like receptor-1(LAIR-1) in children with immune thrombocytopenia (ITP), in order to explore the possible role of LAIR-1 in the pathogenesis of childhood ITP. Methods Expression levels of LAIR-1 on CD4+ T cells, CD8+ T cells and CD19+CD20+ B cells of peripheral blood were measured in 40 children with ITP by flow cytometry. Serum level of solubility LAIR-1 (sLAIR-1) was measured using ELISA. Real-time PCR was used to measure LAIR-1 mRNA expression. Thirty-two healthy children served as the control group. Results The percentages of CD19+CD20+ B cells in the ITP group were significantly higher than in the control group (P+ T cells in the ITP group was significantly lower than in the control group (P+ T cells and CD8+ T cells were significantly lower in the ITP group than in the control group (PPConclusions LAIR-1 expression on CD4+ and CD8+ T cells decreases and serum sLAIR-1 level increases in children with ITP, suggesting that LAIR-1 may play an important role in immune imbalance in these children.
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