Cortisol and catecholamines response to venisection by humans with different blood groups

Hormonal response following a minor physiological stress induced by bleeding in a blood donor clinic was investigated in 134 humans with different blood groups. After venisection, serum cortisol concentration (mean +/- SD) was found highest in blood group A donors (455 +/- 217 nmol/L), followed by group B (364 +/- 206), AB (325 +/- 154) and O (297 +/- 110). In 14 subjects of blood group A compared to an equal number of blood group B subjects, mean plasma adrenaline level was higher in group A (0.23 +/- 0.09 nmol/L) than in group B (0.15 +/- 0.12) but the difference was not statistically significant. Blood group A individuals responded to a stressful situation with higher levels of cortisol, and possibly of adrenaline. These observations tend to support findings of previous studies demonstrating a high risk of diseases related to stress (coronary heart diseases and gastrointestinal diseases), in men with A blood group.     

Analysis of Knops blood group antigens on CR1 (CD35) by the MAIEA test and by immunoblotting

Kn^a, McC^a, Sl^a and Yk^a are red cell antigens of relatively high frequency, located on complement receptor 1 (CR1, CD35). Antibodies to these Knops system antigens are not uncommon. They are not haemolytic and do not reduce the survival of transfused incompatible red cells, but they are a nuisance in transfusion laboratories as they can cause an incompatible crossmatch and must be identified before they can be dismissed as clinically insignificant. Human red cell alloantibodies can be shown to be Knops system antibodies by the monoclonal-antibody-specific immobilization of erythrocyte antigens (MAIEA) test, using murine monoclonal anti-CR1. In addition to confirming that Kn^a, McC^a, Sl^a and Yk^a are located on CR1, the MAIEA test was used to confirm that Cs^a is not on CR1. Red cells of the Helgeson phenotype, the null phenotype of the Knops system by conventional serological methods, have levels of Kn^a, McC^a, Sl^a and Yk^a intermediate between those of α-chymotrypsin-treated cells (which lack Knops system antigens) and those of positive control cells. Level of expression of Knops system antigens is very variable and intensity of staining of immunoblots probed with monoclonal anti-CR1 correlated with strength of Knops system antigens, as determined by the MAIEA test. In individuals heterozygous for alleles producing different allotypes, separate bands representing each allotype on an immunoblot showed identical intensity of staining, suggesting that the quantity of CR1 on red cells is controlled, at least in part, by a locus independent of CR1. An analysis of CR1 on red cells of individuals who have made Knops system antibodies suggested that the Knops system antigens and the antibodies that detect them are complex and heterogeneous.     

通过不同检测系统评价降钙素原对血流感染的临床诊断价值

目的 通过溯源及检测原理不同的两种仪器评价降钙素原对血流感染的临床诊断价值.方法 选取北京协和医院门诊及住院血培养报警阳性的患者标本91份及体检健康标本100份,分别使用VIDAS 30全自动免疫分析仪(简称VIDAS 30)及iFlash 3000化学发光免疫分析仪(简称iFlash 3000)检测降钙素原,分析其变...