Humoural Immunology and Immunochemistry
Summary
Humoural immunology encompasses the arm of adaptive immunity mediated by soluble factors—principally antibodies—produced by B lymphocytes and plasma cells. On encountering antigen, B cells undergo activation, clonal expansion and differentiation into antibody‐secreting plasma cells or memory B cells. Antibodies neutralise pathogens, opsonise microbes for phagocytosis, engage complement pathways and recruit effector cells via Fc receptors. Fine‐tuning of antibody effector functions depends on isotype, subclass, Fc glycosylation and affinity maturation in germinal centres. Immunochemistry provides the analytical toolbox to measure these interactions with high sensitivity and specificity. Techniques exploit the specific binding of antibody and antigen, often coupling one partner to a tracer—radioisotope, enzyme, fluorophore or chemiluminescent moiety—to generate a detectable signal. Assay architectures range from competitive displacement formats for small molecules to two‐site “sandwich” immunoassays for proteins, with solid‐phase separation or homogeneous‐phase detection enabling automation. Together, humoural immunology and immunochemistry underpin both our understanding of protective immune responses and the clinical measurement of antibody‐mediated biomarkers in diagnostics, vaccine evaluation and therapeutic monitoring.
Research from Nature Portfolio
New structural insights have revealed that human IgG3 adopts elevated hexameric Fc platforms when bound to antigen, projecting above the protein corona to optimise engagement of the complement C1 complex. Cryo‐electron microscopy shows that these hexamers enhance C4b deposition adjacent to Fab domains, providing a blueprint for engineering next‐generation antibodies with superior complement‐mediated cytotoxicity.
Longitudinal systems‐serology analyses of COVID‐19 vaccine recipients demonstrate that vaccine platform dictates the kinetics of Fc‐mediated effector functions. Inactivated vaccines elicit slower‐waning phagocytic and cytotoxic profiles, while mRNA boosters produce higher peak FcγR3A‐mediated clearance and broader variant recognition. These findings underscore the role of immunochemistry in dissecting antibody quality beyond neutralisation.
Humoural Immunology and Immunochemistry publication trend
The graph below shows the total number of articles in humoural immunology and immunochemistry across all publications each year (not limited to Nature Index journals).
Technical terms
Antigen (Ag): A molecule or molecular fragment recognised specifically by an antibody or B‐cell receptor.
Antibody (Ab): A secreted immunoglobulin produced by B cells that binds antigen with high specificity.
Epitopes: Discrete antigenic determinants on an antigen recognised by the paratope of an antibody.
Hapten: A low‐molecular‐weight molecule that is antigenic but not immunogenic unless conjugated to a carrier protein.
Tracer: A label (radioisotope, enzyme, fluorophore, chemiluminescent probe) covalently attached to Ab or Ag to enable quantitative signal detection.
Competitive immunoassay: An assay in which sample Ag and labelled Ag compete for a limited number of Ab‐binding sites; signal is inversely proportional to sample Ag concentration.
Sandwich (non‐competitive) immunoassay: An assay using two Abs recognising distinct epitopes of a target Ag; signal is directly proportional to Ag concentration.
Solid‐phase separation: A method for removing unbound tracer, typically by immobilising Ab or Ag on beads or microplates and washing away free tracer.
Homogeneous immunoassay: An assay that requires no separation step, often exploiting tracer quenching or complementation that depends on Ag–Ab complex formation.
References
- Principles of Immunochemistry.
- Complement is activated by elevated IgG3 hexameric platforms and deposits C4b onto distinct antibody domains. Nature Communications (2023).
- Waning and boosting of antibody Fc-effector functions upon SARS-CoV-2 vaccination. Nature Communications (2023).
- A transmembrane precursor of secretory component. The receptor for transcellular transport of polymeric immunoglobulins.. Journal of Biological Chemistry (1982).
- Structural and genetic heterogeneity of the receptor mediating translocation of immunoglobulin A dimer antibodies across epithelia in the rabbit.. Journal of Biological Chemistry (1983).
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