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An isoleucine-zipper motif enhances costimulation of human soluble trimeric GITR ligand

Abstract

Glucocorticoid-induced tumor-necrosis factor receptor (GITR) and its ligand, GITRL, play significant roles in regulating immune responses. It is clear that human soluble GITRL (hsGITRL) transduces signal activity through multiple oligomerization states. To develop human soluble trimeric GITRL protein as a potential therapeutic target, we explored the link of the isoleucine-zipper (ILZ) motif to the N-terminus of the human soluble GITRL with two leucine sequences. hsGITRL, with the ILZ motif (ILZ-hsGITRL), was firstly expressed in Escherichia coli, which exhibited a predominant trimer when identified by Sephadex G-100 filtration and non-reducing SDS–polyacrylamide gel electrophoresis (SDS-PAGE). The significantly higher biological activity of the ILZ-hsGITRL compared with hsGITRL was confirmed by CD4+ T proliferation, interferon-γ (IFN-γ) secretion and binding activity assay. To reveal and compare the underlying mechanisms, the level of extracellular signal-regulated kinase-1/2 (ERK1/2) phosphorylation was examined, indicating that ILZ-hsGITRL induced more persistent and stronger ERK1/2 activation than hsGITRL. In conclusion, the incorporation of an ILZ motif could markedly improve the costimulation of hsGITRL.

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Acknowledgements

This study was supported by the National Natural Science Foundation of China (Grant No. 30871193 and No. 30972748), Natural Science Foundation of Jiangsu Province (Grant No. BK2004405), Natural Science Foundation of Jiangsu Province Educational Commission (Grant No. 08KJB320002), Research Foundation of Jiangsu Province Health Department (Grant No. H200952), and Top Talent Program of Jiangsu University and SCI-Tech Innovation Team of Jiangsu University.

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Correspondence to Shengjun Wang.

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Cui, D., Wang, S., Chen, Y. et al. An isoleucine-zipper motif enhances costimulation of human soluble trimeric GITR ligand. Cell Mol Immunol 7, 316–322 (2010). https://doi.org/10.1038/cmi.2010.7

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