Immunoglobulin (Ig) (Ig)

Gamma globulins are a major class of serum proteins, predominantly consisting of immunoglobulins (antibodies) such as IgG, IgA, and IgM, which are critical components of the adaptive immune system (StatPearls, 2023). Produced by plasma cells, these proteins recognize and bind to specific antigens on pathogens, facilitating their neutralization or destruction through mechanisms like opsonization and complement activation (Britannica, 2024). In clinical practice, gamma globulin preparations, such as intravenous immunoglobulin (IVIG), are administered as replacement therapy for primary immunodeficiency or as immunomodulators for autoimmune conditions like immune thrombocytopenia (ITP) (Mayo Clinic, 2023). Furthermore, specific immunoglobulins or the pathways regulating their persistence, such as the neonatal Fc receptor (FcRn), have become significant therapeutic targets. Drugs like FcRn inhibitors (e.g., efgartigimod) are designed to lower the levels of pathogenic IgG autoantibodies in diseases such as myasthenia gravis by preventing their recycling and promoting degradation (Nature Reviews Drug Discovery, 2022). Monitoring gamma globulin levels via serum protein electrophoresis or specific assays is essential for diagnosing plasma cell dyscrasias and assessing the efficacy of B-cell depleting or FcRn-targeting therapies (NCBI, 2022).

Other names

Gamma globulinAntibodyImmune globulinSerum globulin

Neonatal Fc receptor (FcRn) antagonism to increase IgG catabolism (Nature Reviews Drug Discovery, 2022); direct neutralization of circulating IgE to prevent allergic cascades (PubMed, 2023); and passive immunization through exogenous administration (StatPearls, 2023).