[GPI-Pr Deficiency and Apoptosis of PNH Granulocytes]
To study the relationship of Glycosyl phosphatidylinositol anchored proteins (GIP-Pr) and apoptosis of paroxysmal nocturnal hemoglobinuria (PNH) cells, we isolated peripheral granulocytes from 10 patients with PNH and 10 normal controls and measured apoptosis induced by serum starvation. The FCM analysis of phosphotidylserine (ps) externalization in granulocytes was determined using Annexin-V-FLUOS labeling. After the cells were induced for apoptosis in serum-free medium for 20 hours, the percentage of externalization was 78.6% in normal control cells but 39.5% in PNH cells. The results of FCM analysis of PI stained granulocytes showed that the PI positive rate was 51.5% in control cells and 30.2% in PNH cells. The gel electrophoresis analysis of DNA fragmentation all indicate that PNH granulocytes were relatively resistant to apoptosis as compared with normal controls. This resistance to apoptosis might not be related to the percentage of CD59 deficient granulocytes.
Liu
Hai-Li
HL
National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100005, China; Tong Ren Hospital, Beijing 100730, China; Peking Union Medical College Hospital, Beijing 100730, China.
Xu
Cai-Min
CM
Liu
Fu-Qiang
FQ
Lu
Zhao-Jiang
ZJ
Pan
Hua-Zhen
HZ
Zhang
Zhi-Nan
ZN