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  2. Immunoglobulin E - Wikipedia

    en.wikipedia.org/wiki/Immunoglobulin_E

    IgE primes the IgE-mediated allergic response by binding to Fc receptors found on the surface of mast cells and basophils. Fc receptors are also found on eosinophils, monocytes, macrophages and platelets in humans. There are two types of Fcε receptors: [citation needed] FcεRI (type I Fcε receptor), the high-affinity IgE receptor

  3. Hyperimmunoglobulin E syndrome - Wikipedia

    en.wikipedia.org/wiki/Hyperimmunoglobulin_E_syndrome

    An IgE level greater than 2,000 IU/mL is often considered diagnostic. [17] However, patients younger than 6 months of age may have very low to non-detectable IgE levels. Eosinophilia is also a common finding with greater than 90% of patients having eosinophil elevations greater than two standard deviations above the normal mean. [18]

  4. DOCK8 deficiency - Wikipedia

    en.wikipedia.org/wiki/DOCK8_deficiency

    DOCK8 deficiency, also called DOCK8 immunodeficiency syndrome, is the autosomal recessive form of hyperimmunoglobulin E syndrome, a genetic disorder characterized by elevated immunoglobulin E levels, eosinophilia, and recurrent infections with staphylococcus and viruses. It is caused by a mutation in the DOCK8 gene.

  5. Mast cell - Wikipedia

    en.wikipedia.org/wiki/Mast_cell

    Mast cells express a high-affinity receptor for the Fc region of IgE, the least-abundant member of the antibodies. This receptor is of such high affinity that binding of IgE molecules is in essence irreversible. As a result, mast cells are coated with IgE, which is produced by plasma cells (the antibody-producing cells of the immune system).

  6. Allergen - Wikipedia

    en.wikipedia.org/wiki/Allergen

    Another laboratory test is the blood test for IgE (immunoglobulin production), such as the radioallergosorbent test (RAST) or the more recent enzyme allergosorbent tests (EAST), implemented to detect high levels of allergen-specific IgE in response to particular allergens. Although blood tests are less accurate than the skin tests, they can be ...

  7. Atopy - Wikipedia

    en.wikipedia.org/wiki/Atopy

    Atopy is the tendency to produce an exaggerated immunoglobulin E (IgE) immune response to otherwise harmless substances in the environment. [2] Allergic diseases are clinical manifestations of such inappropriate, atopic responses.

  8. Fragment crystallizable region - Wikipedia

    en.wikipedia.org/wiki/Fragment_crystallizable_region

    In IgG, IgA and IgD antibody isotypes, the Fc region is composed of two identical protein fragments, derived from the second and third constant domains of the antibody's two heavy chains; IgM and IgE Fc regions contain three heavy chain constant domains (C H domains 2–4) in each polypeptide chain.

  9. FCER1 - Wikipedia

    en.wikipedia.org/wiki/FCER1

    The high-affinity IgE receptor, also known as FcεRI, or Fc epsilon RI, is the high-affinity receptor for the Fc region of immunoglobulin E (IgE), an antibody isotype involved in allergy disorders and parasite immunity. FcεRI is a tetrameric receptor complex that binds Fc portion of the ε heavy chain of IgE. [1]