Table 1.
Structure | ||||||
---|---|---|---|---|---|---|
Name | FcγRI | FcγRIIA | FcγRIIB | FcγRIIC | FcγRIIIA | FcγRIIIB |
CD | CD64 | CD32A | CD32B | CD32C | CD16A | CD16B |
Gene | FCGR1A | FCGR2A | FCGR2B | FCGR2C | FCGR3A | FCGR3B |
Alleles | – | H131 R131 | I232 T232 | Q57 stop57 | V176 F176 | NA1 NA2 SH |
Affinity | High | Low to medium | Low to medium | Low to medium | Low to medium | Low to medium |
Expression on resting neutrophils | < 2,000 copies | 30,000–60,000 copies | Low to none; increase when 2B4 promotor haplotype | Low to none | Low to none | 100,000–200,000 copies |
Neutrophil expression in inflammatory conditions | Up to 10-fold increased expression in presence of IFN-γ and G-CSF | Upregulated in presence TNF-α | Low to none; increase when 2B4 promotor haplotype | Low to none | Low to none | 100,000–200,000 copies, subject to shedding |