摘要
目的
①了解HBsAg阳性孕妇婴儿脐静脉血PBMC中TLR3与HBV宫内感染的关系。
②探讨HBsAg阳性孕妇婴儿脐静脉血PBMC中相关免疫细胞与HBV宫内感染的关系。
③探讨TLR3在HBsAg阳性孕妇婴儿HBV宫内感染中可能的作用机制。
方法
①收集2011年7月至2012年1月于太原市传染病医院妇产科分娩的HBsAg阳性孕妇产后脐血共52例。无菌采集分娩时脐血抗凝血30ml,并收集母儿的流行病学资料。
②婴儿脐静脉血PBMC的分离及培养,体外HBV干预宫内感染组和非宫内感染组,以HBV+PolyI:C干预宫内感染组婴儿PBMC。
③多色流式细胞术(FCM)对两组TLR3蛋白表达的荧光强度值以及T细胞、B细胞、DC细胞和CD4+CD25+Treg的百分比进行测定。
结果
①采用多色FCM测定TLR3蛋白表达荧光强度值,经比较:非宫内感染组的TLR3蛋白表达的平均荧光强度值(32.18±11.36)高于宫内感染组(30.29±11.04),差异无统计学意义(t=0.410,P=0.684);宫内感染组TLR3活化后(即PolyI:C刺激后),TLR3蛋白表达的平均荧光强度值(32.16±9.40)升高,与非宫内感染组的(32.18±11.36)相比,无统计学差异(t=-1.824,P=0.078)。
②采用多色FCM测定B细胞的百分比,经比较:非宫内感染组的B细胞的百分比(7.38±6.40)高于宫内感染组(6.76±4.01),没有统计学差异(t=0.210,P=0.834);宫内感染组TLR3活化后,B细胞的百分比(5.14±2.64)降低,与非宫内感染组(7.38±6.40)比较,差异没有统计学意义(t=0.768,P=0.447)。
③非宫内感染组的CD4+T细胞的百分比(41.14±20.08)高于宫内感染组(33.82±2.60),差异尚不能认为有统计学意义(t=0.618,P=0.543);非宫内感染组的CD8+T细胞的百分比(11.30±5.87)与宫内感染组(11.14±9.64)相比,差异无统计学意义(t=0.041,P=0.968);非宫内感染组的CD4+/CD8+比值(4.30±2.28)与宫内感染组的(4.75±3.23)比较,差异尚不能认为有统计学意义(t=-0.30,P=0.767)。
④非宫内感染组的mDC的百分比(0.84±0.58)高于宫内感染组(0.67±0.34),差异尚不能认为有统计学意义(t=-0.485,P=0.633);非宫内感染组的pDC(0.92±0.91)与宫内感染组的(0.91±0.46)比较,差异没有统计学意义(t=0.020,P=0.984)。
⑤非宫内感染组的CD4~+CD25~+Treg细胞的百分比(4.69±3.41)与宫内感染组(3.00)比较,差异无统计学意义(t=0.474,P=0.646)。
结论
①非宫内感染组的TLR3蛋白表达平均荧光强度值高于宫内感染组,而宫内感染组经PolyI:C刺激后其表达水平升高,提示宫内感染可能与婴儿TLR3表达有关。
②非宫内感染组的B细胞、CD4~+T细胞、mDC的百分比高于宫内感染组,提示宫内感染与婴儿B细胞、CD4~+T细胞、mDC表达可能有关。
③本次研究未发现宫内感染与CD8~+T细胞、pDC、CD4~+CD25+Treg细胞的百分比以及CD4~+/CD8~+比值相关,有待于进一步研究。
OBJECTIVE:
①To investigate the relationship between TLR3 in the PBMC of the unbilicalvein blood of babies whose mothers are HBsAg posotive and HBV intrauterineinfection.
②To explore the relationship between immunocytes concerning PBMC and theHBV intrauterine infection.
③To explore the mechanism of TLR3 in HBV intrauterine infection .
METHODS:
①The epidemiological base line data and umbilical vein blood of 52HBsAg-positive pregnant women were collected from Taiyuan infectious hospitalfrom July 2011 to January 2012.
②Experiment was performed in vitro: The PBMC were separated from umbilicalvein blood and then were cultured. The PBMC of HBV intrauterine infection wereintervented by HBV+PolyI:C and HBV.The PBMC with negative HBV intrauterineinfection were intervented only by HBV.
③The protein expession of TLR3 and the percentages of B-cells,T-cells,DC andTreg were detected by FCM.
RESULTS:
①The expression level of TLR3 protein was higher in PBMC with negativeHBV intrauterine infection than that in PBMC with positive HBV intrauterineinfection(32.18±11.36,30.29±11.04),but no significant difference was observed(t=0.410,P=0.684).After the intervention of PolyI:C, the expression level of TLR3increased,but still no significant difference was observed (32.18±11.36, 32.16±9.40;t=-1.824,P=0.078).
②Proportion of B-cells with negative HBV intrauterine uninfection was higherthan the ones with positive HBV intrauterine infection(7.38±6.40;6.76±4.01),but nosignificant difference was observed (t=0.210,P=0.834).After the intervention ofPolyI:C, percentage of B-cells with positive HBV intrauterine uninfection decreased,but still no significant difference was observed(7.38±6.40,5.14±2.64;t=0.768,P=0.447).
③Percentage of CD4+T-cells with negative HBV intrauterine infection washigher than the ones with positive HBV intrauterine infection,but no significantdifference was observed(41.14±20.08,33.82±2.60;t=0.618,P=0.543),while percentageof CD8+T-cells with negative HBV intrauterine infection was higher than the oneswith positive HBV intrauterine infection(11.30±5.87,11.14±9.64) with no significantdifference(11.30±5.87,11.14±9.64;t=0.041,P=0.968).The difference of ratio ofCD4+T-cells to CD8+T-cells between negative and positive HBV intrauterine infectiongroups was not significant(4.30±2.28,4.75±3.23;t=-0.30,P=0.767).
④Percentage of mDC with negaitive HBV intrauterine infection was higher thanthe one with positive HBV intrauterine infection(0.84±0.58,0.67±0.34) but with nosignificant difference (t=-0.485,P=0.633).While percentage of pDC with negaitiveHBV intrauterine infection was higher than the one with positive HBV intrauterineinfection,but with no significant difference there was(0.92±0.91,0.91±0.46;t=0.020,P=0.984).
⑤Percentage of CD4+CD25+Treg with negative HBV intrauterine infection washigher than the one with positive HBV intrauterine infection(4.69±3.41,3.00),but withno significant difference between them(t=0.474,P=0.646).
CONCLUSIONS:
①The fact that expression level of TLR3 protein with negative HBVintrauterine infection was higher than the one with HBV intrauterine infection andthat intervention of PolyI:C caused the increase of the expression level of TLR3protein indicates that HBV intrauterine infection may be linked to TLR3 proteinexpresson.
②The fact that the percentages of B-cells,CD4+T-cells and mDC with negativeHBV intrauterine infection were higher than the ones with positive intrauterineinfection indicates that the B-cells,CD4+T-cells,mDC may be a protective factoragainst placenta HBV infection.
③The fact that association between percentage of CD8+T-cells,pDC as well asCD4+CD25+Treg and the CD4+/CD8+T-cells was not discovered indicates that furtherstudy is required.
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