Polyclonal IgE, B cell, and T cell receptors

The term "Polyclonal IgE, B cell, and T cell receptors" improperly groups together three critical but distinct immune molecules: - **Immunoglobulin E (IgE):** A class of antibodies involved in allergic responses. IgE binds to Fc epsilon receptors (FcεRI and CD23) on mast cells and basophils, leading to histamine and cytokine release upon allergen exposure. Omalizumab and ligelizumab are therapeutic antibodies targeting IgE to prevent allergic reactions[1][3][7]. - **B cell receptor (BCR):** The antigen-specific receptor of B lymphocytes, consisting of membrane-bound immunoglobulin molecules (heavy and light chains) complexed with Igα (CD79a) and Igβ (CD79b) for signal transduction. BCR activation is essential for B cell maturation, antibody production, and plays a role in various immune-mediated diseases and lymphoid cancers[2][4][6][8]. - **T cell receptor (TCR):** A heterodimeric receptor (usually alpha/beta chains) found on T lymphocytes, responsible for antigen recognition via peptide–MHC complexes. TCR activation is central to cell-mediated immunity and is targeted both diagnostically and therapeutically in immunotherapy and transplantation[2][4][6]. Each of these molecules is a validated therapeutic target but should be considered as separate entities for structured information, not combined under a single "target" entry.

Other names

Immunoglobulin E (IgE)IgE receptorB cell receptor (BCR)T cell receptor (TCR)IgE antibodyFc epsilon receptorCD23FcεRIImmunoglobulinAntigen receptor

IgE inhibitors: Block IgE from binding to FcεRI or CD23, preventing mast cell and basophil activation. Anti-CD3: Modulate TCR signaling, deplete T cells or modulate function. BCR pathway inhibition: Block B cell receptor signaling (e.g., Bruton's tyrosine kinase inhibitors).