大豆蛋白降低人体血浆胆固醇浓度的作用途径

摘要

BACKGROUND: Although we have gained much information about leadinduced organ damage, the effect of blood lead level on T cell subgroup is yet to be determined.OBJECTIVE: To assess the effect of blood lead level on T cell subgroup of children, and the association of T cell subgroup with threshold limit value of blood lead level.DESIGN: Comparative observation.SETTING: The Institute of Molecular Microorganism, Maternity and Child Care Hospital, Shanxi Provincial Children Hospital.PARTICIPANTS: Sixty children, (32 boys and 28 girls), aged 3-6 years with a mean of (4.5±1.5) years old, were selected from the suburbs of Taiyuan city between May 2003 and October 2003. Informed consents were obtained from all their guardians. The enrolled children according to their blood lead levels were assigned into three groups, 13 in Group Ⅰ with blood lead level ≥ 0.48 μmol/L, 20 in Group 2 with lead level ≥ 0.24 μmol/L but ＜ 0.48 μmoL/L and 27 in Group 3 with lead level ＜ 0.24 μmol/L.METHODS: Blood lead level and expression of T cell subgroup were measured with graphite furnace atomic absorption spectroscopy and immunofluorescence methods respectively. Student t test was used in data analysis, and linear correlation analysis was used to assess the correlation between blood lead level and expression of T cell subgroup.level and expression of T cell subgroup.pression of CD3 and ratio of CD4 to CD8 were lower in Group 1 (lead level ≥0.48 μmol/L) than Group 3 (lead level ＜ 0.24 μmol/L) (t=3.27,blood lead level showed had significant inverse correlation with CD3 expression and the ratio of CD4 to CD8(r=-0.689,-0.674,P ＜ 0.01).CONCLUSION: A blood lead level ≥ 0.48 μmol/L, is shown to significantly decrease the expression of CD3 and ratio of CD4 to CD8 in peripheral blood, which may impair the children's immunological function.%背景:虽然人们对铅毒性引起机体的损害有了较深入认识,但铅负荷对T细胞淋巴细胞亚群的影响还不十分明确.目的:评估血铅对儿童T细胞亚群的影响,以及血铅临界值与T细胞亚群的关系.设计:对比观察.单位:山西省儿童医院妇幼保健院分子微生物研究所.对象:选择2003-05/2003-10太原市南郊和北郊区儿童60人,男32人,女28人;年龄3～6岁,平均(4.5±1.5)岁.监护人均对检测项目知情同意.根据血铅值将儿童分为3组:≥0.48μmol/L组(n=13),≥0.24 μmol/L,＜0.48μmol/L组(n=20),＜0.24μmol/L组(n=27).方法:①采用石墨炉原子吸收光谱法测定血铅水平.T细胞亚群检测用免疫荧光法.②计量资料差异性比较采用t检验.血铅与T细胞亚群关系采用直线相关分析.主要观察指标:①不同血铅水平儿童T细胞亚群表达比较.②血铅水平与T细胞亚群的关系.结果:儿童60人均进入结果分析.①≥0.48 μmol/L组儿童CD3表达及CD4/CD8比值明显低于＜0.24 μmol/L组(t=3.27,3.07,P＜0.01).②血铅值≥0.48 μmol/L时血铅水平与CD3表达及CD4与CD8比值呈显著负相关(r=-0.689,-0.674,P＜0.01),与CD8表达呈显著正相关(r=0.748,P＜0.01).结论:血铅值水平≥0.48μmol/L,可使外周血CD3表达及CD4与CD8比值下降,对小儿免疫功能产生不良影响.