Abstract:
:IL (interleukin)-4 and IL-13 are key cytokines in the pathogenesis of allergic inflammatory disease. IL-4 and IL-13 share many functional properties as a result of their utilization of a common receptor complex comprising IL-13Ralpha1 (IL-13 receptor alpha-chain 1) and IL-4Ralpha. The second IL-13R (IL-13 receptor) has been identified, namely IL-13Ralpha2. This has been thought to be a decoy receptor due to its short cytoplasmic tail and its high binding affinity for IL-13 but not IL-4. IL-13Ralpha2 exists on the cell membrane, intracellularly and in a soluble form. Recent reports revealed that membrane IL-13Ralpha2 may have some signalling capabilities, and a soluble form of IL-13Ralpha2 can be generated in the presence of environmental allergens such as DerP. Interestingly, IL-13Ralpha2 has also been shown to regulate both IL-13 and IL-4 response in primary airway cells, despite the fact that IL-13Ralpha2 does not bind IL-4. The regulator mechanism is still unclear but the physical association of IL-13Ralpha2 with IL-4Ralpha appears to be a key regulatory step. These results suggest that the cytoplasmic tail of IL-13Ralpha2 may interfere with the association or activation of signalling molecules, such as JAK1 (Janus kinase 1), on IL-4Ralpha and thus prevents downstream signal cascade. The receptor has more complicated functions than a simple decoy receptor. In this review, we discuss newly revealed functions of IL-13Ralpha2.
journal_name
Biochem Soc Transjournal_title
Biochemical Society transactionsauthors
Andrews AL,Nordgren IK,Kirby I,Holloway JW,Holgate ST,Davies DE,Tavassoli Adoi
10.1042/BST0370873subject
Has Abstractpub_date
2009-08-01 00:00:00pages
873-6issue
Pt 4eissn
0300-5127issn
1470-8752pii
BST0370873journal_volume
37pub_type
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