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Background Chemokines and their receptors have been a research focus in transplantation immunology.Chemokines and their receptors play a role in lymphocyte recruitment and differentiation process.This study aimed to observe whether IL-4 and IL-10 may regulate the expression of chemokine receptors CCR3,CCR5 and CXCR3 on CD4+ T cells in CBA/JxDBA/2 mouse model and to explore the role of CCR3,CCR5,CXCR3 in immune tolerance in pregnancy.Methods The mouse model of spontaneous abortion (CBA/JxDBA/2) and the normal pregnant mouse model (CBA/JxBALB/c) were used.CBA/JxDBA/2 mice were injected with IL-4 (CBA/JxDBA/2-1L-4),IL-4 and IL-10 (CBA/JxDBA/2-1L-4+IL-10),or normal saline (CBA/JxDBA/2-NS) as a control.The expression of CCR3,CCR5 and CXCR3 on CD4+ T cells from mouse peripheral blood was measured by the double-labelled FCM method,and the embryo resorption rate was also examined.Results The embryo resorption rate in the CBA/JxDBA/2 group without any treatment was significantly higher than that in the CBA/JxBALB/c group (17.9% vs 3.7%,P＜0.01).The embryo resorption rate in the CBA/JxDBA/2 group immunized with IL-4 or IL-4 together with IL-10 was significantly decreased,compared with that in the control and NS groups respectively.CCR3 expression on CD4+ T cells in the CBA/JxDBA/2 group without any treatment was significantly lower than that in the CBA/JxBALB/c group (0.3738±0.3575 vs 1.2190±0.2772,P＜0.01 );both CCR5 (3.0900±1.5603 vs 1.2390±0.6361,P ＜0.01)and CXCR3 (2.4715±0.9074 vs 0.9200±0.5585,P ＜0.01 ) expressions on CD4+ T cells of the CBA/JxDBA/2 group without any treatment were significantly higher than those of the CBA/JxBALB/c group.Significant up-regulation of CCR3 and down-regulation of CXCR3 were found in the CBA/JxDBA/2 group treated with IL-4 (CCR3:2.0360±0.6944,CXCR3:1.3510±0.5263,P ＜0.01) or IL-4 and IL-10 (CCR3:1.8160±1.0947,CXCR3:1.0940±0.7168,P＜0.01).Because of the CCR5,IL-4 and IL-10 (1.9400±0.8504 vs 3.0900±1.5603,P ＜0.05),but IL-4 alone (2.5310±1.3595 vs 3.0900±1.5603,P ＞0.05)treatment significantly decreased the expression of CCR5 in CBA/JxDBA/2.Conclusions The abnormal expression of CCR3,CCR5 and CXCR3 on CD4+ T cells may play an important role in the pathogenesis of spontaneous abortion.The pregnancy immune tolerance may be induced through selective induction of CCR3,CCR5 and CXCR3 expressions by IL-4 together with IL-10.