Ann Lab Med.  2018 Jul;38(4):362-366. 10.3343/alm.2018.38.4.362.

Flow-Cytometric Analysis of HNA-2 Expression and Phenotypes Among Thai Blood Donors

Affiliations
  • 1Graduate Program in Biomedical Sciences, Faculty of Allied Health Sciences, Thammasat University, Pathumtani, Thailand. oytipntl@hotmail.com
  • 2Department of Medical Technology, Faculty of Allied Health Sciences, Thammasat University, Pathumtani, Thailand.
  • 3Blood Bank Section, Thammasat University Hospital, Pathumtani, Thailand.

Abstract

BACKGROUND
Antibodies specific to human neutrophil antigen (HNA), especially HNA-2, are implicated in various conditions, including neonatal alloimmune neutropenia, febrile non-hemolytic transfusion reactions, and transfusion-related acute lung injury. The distribution of the HNA-2 phenotype frequencies in the Thai population remains unknown. This study aimed to investigate HNA-2 phenotype frequencies in Thai blood donors and to compare the relationships of sex and age with HNA-2 expression.
METHODS
EDTA blood samples were collected from 220 unrelated healthy Thai blood donors, including 150 males and 70 females, with ages ranging from 20 to 57 years. Polymorphonuclear cells were isolated and stained with monoclonal antibodies clone MEM-166 and clone 2D1, which are specific to human CD177 (HNA-2) and CD45, respectively. HNA-2 expression according to sex and age was analyzed by flow cytometry.
RESULTS
Among the 220 donors, HNA-2-positive and HNA-2-null-phenotype frequencies were 0.995 and 0.005, respectively. Mean antigen expression was significantly higher in women (71.01±15.46%) than in men (64.59±18.85%; P < 0.05). No significant differences in HNA-2 expression were found between different age groups. HNA-2 phenotype frequencies were similar to those in Asian, African, American, and Brazilian populations, but were significantly different from those in eastern Japanese, Korean, and French populations (P < 0.001).
CONCLUSIONS
This is the first report of HNA-2 phenotype frequencies in a Thai population, and the data will be helpful in predicting the risk of HNA-2 alloimmunization and in recruiting granulocyte panel donors.

Keyword

HNA-2; Phenotype frequencies; Flow cytometry; Thais

MeSH Terms

Acute Lung Injury
Antibodies
Antibodies, Monoclonal
Asian Continental Ancestry Group*
Blood Donors*
Clone Cells
Edetic Acid
Febrile Neutropenia
Female
Flow Cytometry
Granulocytes
Humans
Male
Neutrophils
Phenotype*
Tissue Donors
Transfusion Reaction
Antibodies
Antibodies, Monoclonal
Edetic Acid

Figure

  • Fig. 1 Flow-cytometric analysis of the reactivity of CD45 and CD177 (MEM-166) with neutrophils. (A) HNA-2-positive individual showing 86.9% HNA-2 expression; (B) HNA-2-negative individual showing 0.08% HNA-2 expression.


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