Which immunoglobulin is responsible for the symptoms in a patient who has allergic rhinitis?

Which immunoglobulin is responsible for the symptoms in a patient who has allergic rhinitis?

• A. IgG
• B. IgM
• C. IgE
• D. IgA

Answer: (C)

The symptoms experienced by a patient with allergic rhinitis are primarily mediated by immunoglobulin E (IgE). In allergic reactions, exposure to allergens such as pollen, dust mites, or pet dander leads to the sensitization of B cells, which then produce IgE antibodies. These IgE antibodies bind to allergens and attach to mast cells and basophils, causing them to release histamines and other inflammatory mediators. This release is what triggers the symptoms of allergic rhinitis, including sneezing, itching, nasal congestion, and rhinorrhea. Other immunoglobulins play different roles in the immune response. IgG is involved in the secondary immune response and helps in the opsonization of pathogens, while IgM is primarily the first antibody produced in response to an infection and functions mainly in complement activation. IgA plays a crucial role in mucosal immunity and is found in fluids such as saliva, tears, and mucus, but it is not responsible for the symptoms seen in allergic rhinitis. In summary, IgE is the key immunoglobulin involved in mediating the allergic response associated with allergic rhinitis, making it the correct choice for understanding the pathophysiology of this condition.

The symptoms experienced by a patient with allergic rhinitis are primarily mediated by immunoglobulin E (IgE). In allergic reactions, exposure to allergens such as pollen, dust mites, or pet dander leads to the sensitization of B cells, which then produce IgE antibodies. These IgE antibodies bind to allergens and attach to mast cells and basophils, causing them to release histamines and other inflammatory mediators. This release is what triggers the symptoms of allergic rhinitis, including sneezing, itching, nasal congestion, and rhinorrhea.

Other immunoglobulins play different roles in the immune response. IgG is involved in the secondary immune response and helps in the opsonization of pathogens, while IgM is primarily the first antibody produced in response to an infection and functions mainly in complement activation. IgA plays a crucial role in mucosal immunity and is found in fluids such as saliva, tears, and mucus, but it is not responsible for the symptoms seen in allergic rhinitis.

In summary, IgE is the key immunoglobulin involved in mediating the allergic response associated with allergic rhinitis, making it the correct choice for understanding the pathophysiology of this condition.