Omalizumab True statement is?
**Core Concept**
Omalizumab is a recombinant humanized monoclonal antibody that targets the high-affinity IgE receptor (FcεRI) on mast cells and basophils. By binding to IgE, it prevents IgE from binding to FcεRI, thereby inhibiting the release of histamine and other mediators from mast cells.
**Why the Correct Answer is Right**
Omalizumab is used in the treatment of severe allergic asthma and chronic spontaneous urticaria. It works by preventing the binding of IgE to the high-affinity IgE receptor (FcεRI) on mast cells and basophils, which results in reduced histamine release and subsequent decrease in symptoms. This is particularly beneficial for patients with severe allergies who are unresponsive to standard treatments.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because omalizumab is not a corticosteroid.
**Option B:** Incorrect because omalizumab does not work by inhibiting the enzyme histamine methyltransferase, which is involved in histamine degradation.
**Option C:** Incorrect because omalizumab is not a biologic agent that targets tumor necrosis factor-alpha (TNF-alpha).
**Clinical Pearl / High-Yield Fact**
Omalizumab is administered via subcutaneous injection every 2-4 weeks, and its efficacy is monitored by measuring serum IgE levels. It is essential to note that omalizumab is not a rescue medication and should not be used to treat acute allergic reactions.
**Correct Answer:** C. Omalizumab is a recombinant humanized monoclonal antibody that targets the high-affinity IgE receptor (FcεRI) on mast cells and basophils.