Abstract
Interleukin (IL)-38 is the latest member of the IL-1 cytokine family. However, as a result of lacking efficient method to generate relatively large quantity of IL-38, its precise functions are poorly understood. In the present study, the cloning, expression, purification, and activity analysis of recombinant human IL-38 was described. Human IL-38 cDNA was cloned into the prokaryotic expression vector pET-44. The recombinant IL-38 containing a C-hexahistidine tag was expressed in Escherichia coli BL21 (DE3) which induced by isopropyl-β-D-thiogalactoside. The expressed fusion protein was purified by Ni-NTA affinity chromatography. IL-38 protein was largely found in the soluble fraction. The purified IL-38 appeared a single band on SDS-PAGE, the yield of IL-38 was 4 mg from 1 L of bacterial culture, and the purity was more than 98% with low endotoxin level (<0.1 EU/μg). Western blotting confirmed the identity of the purified protein. Activity analysis showed that IL-38 can inhibit effectively the expression of proinflammatory cytokines, such as tumor necrosis factor-α, IL-1β, IL-17, and monocyte chemoattractant protein-1 in lipopolysaccharide-activated THP-1 cells. The production and characterization of biologically active IL-38 will be beneficial for its potential role in clinical applications.
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Published in Russian in Molekulyarnaya Biologiya, 2016, Vol. 50, No. 3, pp. 466–473.
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Yuan, X.L., Li, Y., Pan, X.H. et al. Production of recombinant human interleukin-38 and its inhibitory effect on the expression of proinflammatory cytokines in THP-1 cells. Mol Biol 50, 405–411 (2016). https://doi.org/10.1134/S0026893316030134
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DOI: https://doi.org/10.1134/S0026893316030134