ArticleImmunogenetics2012
Molecular characterization and expression analysis of the putative interleukin 6 receptor (IL-6Rα and glycoprotein-130) in rainbow trout (Oncorhynchus mykiss): salmonid IL-6Rα possesses a polymorphic N-terminal Ig domain with variable numbers of two repeats.
Article in Immunogenetics, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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5 citing papers in PubMed, 15 citations in OpenAlex.
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4 authors at 2 institutions in 2 countries.
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Abstract
Interleukin (IL)-6, the founding member of IL-6 family cytokines, plays non-redundant roles in hematopoiesis and acute phase responses. IL-6 signals via a specific private IL-6Rα and a common beta chain gp130. In this study, we have cloned both the IL-6Rα and gp130 in rainbow trout. The trout gp130 cDNA encodes 906 aa and is similar in size, extracellular domain structure (D1-D6) and presence of intracellular motifs important for signal transduction to tetrapod gp130s. The trout IL-6Rα cDNA encodes for 834 aa and is larger compared to tetrapod IL-6Rαs, as are other fish IL-6Rα molecules due to a large D1 domain. However, the cytokine-binding domain is well conserved across vertebrates, with four conserved cysteine residues in the N-terminal FNIII domain and a WSXWS motif in the C-terminal FNIII domain. Furthermore, a phylogenetic tree analysis confirmed that the reported fish IL-6Rα and gp130 molecules are orthologues to their tetrapod counterparts. The extra large D1 domain of the salmonid IL-6Rα molecules results partially from the insertions of two repetitive sequences of [TS]-[TF]-VSTTT-[ND]-TTSNG and TTVS-[AT]-IKD-[DG]-S-[KD]-N-[GR], respectively. Furthermore the numbers of repetitions of the two motifs were variable in different individuals and cell lines, and even in the same fish allelic polymorphism exists. Trout IL-6Rα was expressed at higher levels than gp130 in a number of tissues examined and the expression of both IL-6Rα and gp130 could be modulated by LPS and Poly I:C in the cell lines studied. The expression patterns of the receptors suggest that high level expression of IL-6Rα is critical for IL-6 responsiveness.
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