Immunoglobulin
Immunoglobulin: A type of protein produced by the immune system in response to a specific antigen, such as a virus or bacteria.
Types of Immunoglobulins
There are five primary classes of immunoglobulins, each with distinct roles in the immune response:
- IgG: The most abundant type in the blood, providing long-term protection and capable of crossing the placenta to provide immunity to the fetus.
- IgA: Found in mucous membranes, saliva, and tears, and is essential for mucosal immunity.
- IgM: The first antibody to be produced in response to an infection, indicating recent exposure.
- IgE: Associated with allergic reactions and responses to parasitic infections.
- IgD: The least understood, primarily found on the surface of B cells and involved in initiating immune responses.
FAQs
- How are immunoglobulins measured?
- Immunoglobulins can be measured through blood tests to assess immune function or diagnose conditions such as immunodeficiencies and autoimmune diseases.
- Can immunoglobulin levels be altered?
- Yes, levels can be influenced by infections, chronic diseases, and certain medications. Treatments such as immunoglobulin therapy can also adjust these levels.
- What is immunoglobulin therapy?
- This therapy involves the administration of immunoglobulins to boost the immune system, often used in individuals with immunodeficiency disorders.