Abstract
Interleukin-11 (IL-11) is a multifunctional cytokine involved in various pathways in blood cells, their precursors and many other cell types in vitro and in vivo. The effects of IL-11 are largely mediated by the IL-11 receptor α-chain (IL-11Rα). In this study, a putative cDNA sequence encoding the 414 amino acid propeptide of chicken IL-11R (chIL-11R) was identified. The predicted 414 amino acid sequence showed 42–43% sequence identity with mammalian homologues. In a domain search of the molecule, two fibronectin (FN) type-III domains were identified in the C- terminal portion. On comparison with mammalian IL-11R, 4 conserved cysteine residues and a WSXWS motif were observed within the FN type-III domains. Expression analysis revealed that chIL-11Rα is strongly expressed in brain, heart, lung, liver, glandular stomach, kidney, the immature testis, ovary and chicken blastodermal cells (CBCs) after 1-day-cultivation. These findings strongly indicate that the identified chicken cDNA sequence encodes chIL-11R α-chain homologue.
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