Expression pattern of CD55 and CD59 on red blood cells in sickle cell disease.
OBJECTIVE
To investigate the pattern of CD55 and CD59 expression on RBCs of SCD patients, and its association with anemia, biochemical parameters of hemolysis, level of erythropoietin, and pro-inflammatory markers.


METHODS
Flow cytometric analysis was performed on RBCs from 71 adult SCD patients and 53 healthy controls, using the commercial REDQUANT kit.


RESULTS
CD59 deficiency was significantly higher among SCD patients than among healthy controls. The proportions of CD55-deficient and CD59-deficient RBCs from SCD patients were significantly higher when compared with those from healthy controls (0.17 vs. 0.09 and 2.1 vs. 1.2, respectively). The MFI of CD55 and CD59 expression on RBCs in SCD was significantly reduced when compared to the expression in healthy controls (5.2 vs. 6.4 and 19.4 vs 20.3, respectively). The pattern of CD55 and CD59 expression was not correlated with anemia, biomarkers of hemolysis, erythropoietin level, or other pro-inflammatory markers.


CONCLUSIONS
There is an altered pattern of CD55 and CD59 expression on RBCs of SCD Patients; however, it does not seem to play a causal role in the pathophysiology of anemia, and is unlikely to be influenced by the level of erythropoietin or other inflammatory mediators.
a Department of Pathology, Faculty of Medicine , Kuwait University , Safat , Kuwait.
Lama
L
Al-Faris
a Department of Pathology, Faculty of Medicine , Kuwait University , Safat , Kuwait.
Monera
M
Al-Rukhayes
a Department of Pathology, Faculty of Medicine , Kuwait University , Safat , Kuwait.
Salah
S
Al-Humood
D000328:Adult; D000755:Anemia, Sickle Cell / Q000097:blood* / Q000235:genetics*; D018958:CD55 Antigens / Q000096:biosynthesis* / Q000097:blood; D018957:CD59 Antigens / Q000096:biosynthesis* / Q000097:blood; D004912:Erythrocytes / Q000378:metabolism*; D004921:Erythropoietin / Q000097:blood; D005260:Female; D005434:Flow Cytometry; D006801:Humans; D008297:Male; D055815:Young Adult
D018958:CD55 Antigens; D018957:CD59 Antigens; C051590:CD59 protein, human; D004921:Erythropoietin
CD55; CD59; Sickle Cell Disease (SCD)