Abstract
Human neutrophil antigen (HNA)-4a/4bw is encoded by 230G>A in ITGAM, which results in an Arg61His substitution of the αM chain (CD11b) of complement receptor 3 (CR3; CD11b/18 or Mac-1). HNA-4a antibodies have been detected in the sera of female blood donors and in maternal sera that caused alloimmune neonatal neutropenia (ANN), in which maternal immunoglobulin (Ig)G antibodies against a paternally inherited HNA cross the placenta and destroy fetal and neonatal neutrophils. However, to date, antibodies specific for HNA-4b have not been reported. Here, we report the first two examples of HNA-4b antibodies. The two sera studied were both from previously pregnant females, one a multiparous female blood donor implicated in two separate transfusion reactions and the second a mother whose first pregnancy resulted in the birth of a severely neutropenic (0 × 10(6) neutrophils/L) infant affected with ANN. Serum neutrophil antibody testing was by flow cytometry and CD11b/18 monoclonal antibody immobilization of granulocyte antigens assay, and HNA genotyping was performed by polymerase chain reaction with sequence-specific priming and allele-specific 5' exonuclease assays. Sera from both women contained IgG antibodies reactive only with HN...Continue Reading
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