The FCGR3B Antibody, HRP conjugated is a specialized immunological reagent designed to detect the Fc gamma receptor IIIb (FcγRIIIb), a low-affinity receptor for immunoglobulin G (IgG). This antibody is critical for studying immune complex regulation, neutrophil function, and its role in autoimmune diseases. The HRP (horseradish peroxidase) conjugation enables enzymatic detection in assays like ELISA, making it indispensable for quantitative analysis of FCGR3B expression and function.
The HRP-conjugated antibody is optimized for quantitative detection of FCGR3B in:
Serum/Plasma: To measure soluble FCGR3B levels in autoimmune diseases (e.g., ANCA-associated vasculitis) .
Cell Lysates: To assess FCGR3B expression in neutrophils or transfected cell lines .
Capture antibody (unconjugated) binds to FCGR3B.
HRP-conjugated detection antibody binds to the captured antigen.
Substrate addition (e.g., TMB) generates a colorimetric signal proportional to FCGR3B concentration .
Immune Complex Modulation: FCGR3B’s role in trapping immune complexes without triggering neutrophil activation is studied using this antibody to quantify receptor expression in inflammatory conditions .
Genetic Polymorphism Studies: FCGR3B variants (e.g., NA1/NA2 alleles) influence disease severity in conditions like granulomatosis with polyangiitis (GPA). The antibody aids in correlating receptor expression levels with clinical outcomes .
ANCA-Associated Vasculitis:
FCGR3B’s NA1 allele is linked to severe renal disease in granulomatosis with polyangiitis (GPA). The HRP-conjugated antibody enables quantification of FCGR3B expression in patient sera, aiding genotype-phenotype correlations .
IgA/IgG antineutrophil cytoplasmic antibodies (ANCA) engage FCGR3B, but the receptor’s inability to trigger neutrophil activation suggests a protective role in limiting tissue damage .
Copy Number Variations (CNVs): No significant CNVs in FCGR3B were found in rheumatoid arthritis (RA) patients, ruling out genetic duplication/deletion as a risk factor .
FcγR Polymorphisms: The NA1 allele (higher affinity for IgG) correlates with enhanced neutrophil responses in vitro, but its association with disease severity remains debated .
| Antibody Type | Conjugate | Applications | Host | Reactivity | Source |
|---|---|---|---|---|---|
| Polyclonal (HRP) | HRP | ELISA, IF | Rabbit | Human | |
| Monoclonal (Unconjugated) | None | Cytometric bead array | Mouse | Human | |
| Polyclonal (Biotin) | Biotin | ELISA | Rabbit | Human |
Note: The HRP-conjugated polyclonal antibody is preferred for ELISA due to its high sensitivity and specificity for AA 18–125 .