摘要
目的 :探讨干预CD86协同刺激信号在母 胎界面Th1 Th2型细胞因子表达调控及诱导母 胎免疫耐受中的作用。方法 :将正常妊娠模型CBA×BALB C和自然流产模型CBA×DBA 2的CBA孕鼠均分为 3组 :对照组于孕第 4、6、8、10天腹腔注射大鼠IgG ;A组于孕第 4、6、8、10天腹腔注射大鼠抗小鼠CD86mAb ;B组仅于孕第 4天 (着床期 )腹腔注射大鼠抗小鼠CD86mAb。孕第 9天 ,竞争性半定量RT PCR测定各组母 胎界面Th1 Th2型细胞因子转录水平 ;孕第 9、14天ELISA测定母 胎界面组织培养上清IL 4 IFN γ比值 ;孕第 14天比较两种模型各组的胚胎吸收率R。结果 :正常妊娠模型中 ,干预CD86协同刺激信号对母胎界面原有Th2型免疫偏离及妊娠预后均无显著影响。自然流产模型中 ,干预CD86协同刺激信号能够诱导母胎界面局部形成Th2型免疫偏离并显著改善其妊娠预后。结论 :于孕早期干预CD86协同刺激信号能够恢复母 胎界面局部Th1型 Th2型细胞因子表达的生理平衡 ,形成维持正常妊娠所需的Th2型免疫偏离 ,诱导母 胎免疫耐受。
Objective:To explore the role of CD86 costimulation in inducing Th2 bias at maternal-fetal interface and the relationship to outcomes of gestation.Methods:Pregnant DBA/2J mated CBA/J mice with a high embryo resorption rate from 20% to 30% and BALB/C mated CBA/J mice with low embryo resorption rates were studied,with rat anti-murine CD86 mAb administered intraperitoneally at the dosage of 100 μg,at the time of implantation(day 4) and on the following days(6,8,10) of gestation.The competitive semiquantity RT-PCR and ELISA was applied to analysis of the transcription and expression of Th type-1/Th type-2 cytokines at the maternal-fetal interface at day 9 or day 14 of gestation respectively.The embryo resorption rate was counted at day 14 of gestation.Results:In the model of normal pregnancy,blockade of CD86 costimulation had no significant effects on the original Th2 bias at the maternal-fetal interface,and the outcomes of gestation had not changed significantly.While in the model of abortion-prone,blockade of CD86 costimulation successfully induced a Th2 bias at maternal-fetal interface.Therefore,the embryo resorbing rates decreased significantly.Conclusion:Blocking the CD86 costimulation at the early stage of the abortion-prone pregnancy could recover the physiological balance of Th1/Th2 at maternal-fetal interface and induce the maternal-fetal immune tolerance.
出处
《中国免疫学杂志》
CAS
CSCD
北大核心
2003年第8期548-552,共5页
Chinese Journal of Immunology
基金
国家自然科学基金 (No3 9770 773 )
中科院细胞所开放课题基金 (11 3 3 0 3 )资助
