Journal
CURRENT ALLERGY AND ASTHMA REPORTS
Volume 7, Issue 5, Pages 338-345Publisher
CURRENT SCIENCE INC
DOI: 10.1007/s11882-007-0051-x
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Funding
- NATIONAL HEART, LUNG, AND BLOOD INSTITUTE [P01HL076383] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES [R01AI058157] Funding Source: NIH RePORTER
- NHLBI NIH HHS [P01HL076383] Funding Source: Medline
- NIAID NIH HHS [U19AI70325, R01AI58157] Funding Source: Medline
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Interleukin (IL)-13 is an immunoregulatory cytokine secreted predominantly by activated T-helper type 2 (Th2) cells, and it has been identified as crucial in developing allergic inflammatory responses. Its diverse functions are mediated by a complex receptor system including IL-4 receptor alpha (IL-4R alpha CD124) and two other cognate cell surface proteins, IL-13R alpha 1 (CD213a1) and IL-13R alpha 2 (CD213a2). IL-13R alpha 1 forms a heterodimer with IL-4R alpha that is a signaling IL-13 receptor. In contrast, IL-13R alpha 2 has been thought to be a decoy receptor due to its short cytoplasmic tail. IL-13R alpha 2 exists on the cell membrane, intracellularly, and in soluble form. Recent reports revealed that membrane IL-13Ra2 may have some signaling capabilities, and soluble IL-13R alpha 2 is a critical endogenous modulator for IL-13 responses. The receptor has more complicated functions than a simple decoy receptor. In this review, we describe the isoforms of IL-13R alpha 2 and discuss newly revealed functions of IL-13R alpha 2.
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