老年人淋巴细胞IL-2Rγ链的表达及其意义

Objective:To study the role of IL 2Rγ chain in the immuno senescence process Methods:8 young, aged from 18 to 35 years(average 24 9±5 8 years), and 17 old healthy people, aged from 65 to 79 years(average 69 4±4 2 years), had been selected for determination the proliferative responses of peripheral blood lymphocytes to PHA, the percentage and dynamic changes of CD132, CD45R positive cells, also, the gene expression of IL 2Rγ chain with RT PCR using the designed primers Results:The results showed that the PHA proliferative response of lymphocytes of aged people(0 199±0 055) were lower than that of young people(0 279±0 054), P=0 0012 The expression of IL 2Rγ chain on the lymphocytes surface decreased in aged people, 46 2%±7 7%, compared to young people, 68 0%±11 8%, P<0 001, It was verified from RT PCR result that the event occurred at transcription level The time dynamic curve of IL 2Rγ chain expression were different between aged and young people Conclusion:A preliminary conclusion would be drawn that the IL 2Rγ chain play an important role in the declined immune function of aged

锌和乙肝病毒疫苗接种

营养是免疫应答的决定性因素，急性和慢性营养缺乏是世界范围内免疫缺陷最普遍的原因。已经报道的营养缺乏包括吞噬作用、T细胞计数、对促细胞分裂的细胞增殖应答和细胞因子产物对某些免疫有重要影响。另外，我们已经报道了树突细胞（DC）的抗原（Ag）表达能力，最重要的专职Ag-提呈细胞（APC）在急性营养不良时受到损坏。在营养不良的患者中因接种疫苗而产生特异性抗体的滴度也降低，特别是儿童。

小鼠胸腺基质细胞单抗对胸腺细胞及脾细胞增殖的抑制作用

试验两种大鼠抗小鼠胸腺基质细胞（ＭＴＳＣ）ＭｃＡｂｓＰｆ１８－３、Ｒｓ２１－Ｃ６的生物作用。Ｐｆ１８－３ＭｃＡｂ识别分子表达于胸腺细胞、脾脏Ｔ及Ｂ细胞；Ｒｓ２１－Ｃ６只表达于ＭＴＳＣ。加Ｐｆ１８－３或Ｒｓ２１－Ｃ６于ＭＴＥＣＩ与胸腺细胞或脾细胞的体外培养中，在ＣｏｎＡ存在及不存在下，均可抑制ＭＴＥＣ１诱导胸腺细胞及脾细胞的增殖作用。ＣｏｎＡ活化下，其对胸腺细胞增殖的抑制率Ｐｆ１８－３为９６％；Ｒｓ２１－Ｃ６为９１％。对脾细胞的抑制率Ｐｆ１８－３为７５％；Ｒｓ２１－Ｃ６为５１％。Ｐｆ１８－３对单纯ＣｏｎＡ活化的胸腺细胞增殖也有显著的抑制作用，而Ｒｓ２１－Ｃ６无此作用。包被于平皿的固相Ｐｆ１８－３ＭｃＡｂ，对胸腺细胞、脾细胞均有轻度但显著的促增殖作用。故Ｐｆ１８－３ＭｃＡｂ识别的抗原分子（及其配基）参与Ｔ细胞的活化过程。鉴于Ｐｆ１８－３＋细胞的分布有其特异性，分析此抗原分子的功能有重要的意义。