早、中、晚孕期胎盘因子体外抗HIV-1的研究

目的:探讨早、中、晚孕期胎盘因子(PF)体外抗人免疫缺陷病毒-1(HTV-1)的作用及其在HIV-1垂直传播中可能的作用.方法:采用荧光染料Calcien-AM标记的H9/HIV-1 ⅢB分别与早、中、晚孕期不同稀释浓度的PF作用后,与MT2细胞混合培养,荧光显微镜下观察合胞体的形成;用游离的HIV-1 ⅢB感染MT2细胞,并分别与早、中、晚孕期不同稀释浓度的PF作用后,用MTT法检测HW-1感染细胞的存活率,用HIV-1 p24抗原试剂盒检测细胞培养上清中p24抗原含量的变化.结果:各孕期PF并不能抑制MT2和H9/HIV-1 ⅢB细胞的融合,但可以增加HIV-1感染细胞的存活率及减少HIV-1 p24抗原的表达,且效应以早孕期PF最大,中孕期PF其次,晚孕期PF最小,并与剂量呈正相关.结论:PF在体外具有抗HIV-1的作用,并呈现孕期和剂量相关性,可能在阻断HIV-1垂直传播中具有一定作用.     

Haemoglobin Belfast 15 (A12) Tryptophan→Arginine: A New Unstable Haemoglobin Variant

A new unstable haemoglobin, α₂β₂15 Trp→ Arg (Hb Belfast), with increased oxygen affinity has been found during the routine investigation of a long-stay psychiatric patient. It seemed to cause little haematological disorder. The reticulocytes synthesized normal and abnormal β-chains at the same rate but in the circulating blood Hb Belfast amounted to only 27·5% of the total haemoglobin.