Abstract
Interferon (IFN)-λ, also known as IL-28A, IL-28B, or IL-29, is a new type III IFN, which shares many functional characteristics with type I IFN (α/β). Currently, IFN-α is used in the treatment of certain forms of cancer with severe adverse effects. Some researches had stated that IFN-λs induced a similar but restricted growth inhibition of tumor cells relative to IFN-α; moreover, mutations of IFN-λs could strongly impact its biological properties. In this study, three hIL-29 mutants (K33R, R35K, and K33R/R35K) were generated by site-directed mutagenesis and efficiently expressed in Pichia pastoris GS115, which have considerable abilities to inhibit the growth of BEL-7402, HCT-8, and SGC-7901 tumor cells in vitro. The results showed that these mutants (K33R, R35K, and K33R/R35K) exhibited a significantly enhanced anti-proliferation activity against these tumor cells, compared with native hIL-29 in vitro. Further assay in vitro indicated that superior to K33R and R35K, K33R/R35K had a significant increase in anti-tumor activity compared with IFN-α2b, which suggested that the K33R/R35K could make improvement for the effectiveness of native hIL-29 in clinic and could be used as a potentially powerful candidate for cancer immunotherapy.
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We thank Junqing Wang, Haijun Zheng, Chunlei Ge, and Rong Zhu for previous research work.
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Lu, Y., Li, L., Chen, W. et al. Enhanced Anti-Tumor (Anti-Proliferation) Activity of Recombinant Human Interleukin-29 (IL-29) Mutants Using Site-Directed Mutagenesis Method. Appl Biochem Biotechnol 177, 1164–1175 (2015). https://doi.org/10.1007/s12010-015-1804-y
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DOI: https://doi.org/10.1007/s12010-015-1804-y