Interleukin 5 receptor alpha subunit

The interleukin 5 receptor alpha subunit (IL5RA) is a protein that in humans is encoded by the IL5RA gene. This receptor is a part of the interleukin 5 receptor complex, which is involved in the immune system's response to allergens and parasites.

Structure

The IL5RA is a type I cytokine receptor that consists of an extracellular domain, a transmembrane domain, and a cytoplasmic domain. The extracellular domain is responsible for binding to interleukin 5 (IL-5), a cytokine that plays a crucial role in the growth and differentiation of eosinophils.

Function

The primary function of the IL5RA is to bind IL-5, which triggers the activation of the receptor complex. This activation leads to the recruitment of the beta common subunit (βc), which is shared with other cytokine receptors such as the interleukin 3 receptor and the granulocyte-macrophage colony-stimulating factor receptor. The formation of this receptor complex initiates a signaling cascade that results in the proliferation and activation of eosinophils.

Clinical significance

Dysregulation of IL5RA expression or function can lead to various allergic diseases and eosinophilic disorders. For instance, elevated levels of IL5RA have been associated with asthma, eosinophilic esophagitis, and hypereosinophilic syndrome. Targeting the IL5RA with specific monoclonal antibodies is a therapeutic strategy in the treatment of these conditions.

Interactions

IL5RA interacts with several proteins to mediate its effects. It forms a complex with the βc subunit to transduce signals. Additionally, it interacts with intracellular signaling molecules such as Janus kinases (JAKs) and signal transducer and activator of transcription proteins (STATs) to propagate the signal downstream.

See also

• Interleukin 5
• Eosinophil
• Cytokine receptor
• Allergic disease

External links

• IL5RA gene - NCBI
• IL5RA protein - UniProt