Int J Med Sci 2014; 11(2):172-179. doi:10.7150/ijms.6875 This issue

Research Paper

Intracellular Distributing and Interferon-γ Secretion of Human Interleukin-18 in BxPC-3 Cells

Jin Yang1*, Linlin Chen1*, Bin Xu1, Jian Xu2✉, Jinquan Sun2, Wen Shen2, Ting Zhang2

1. Department of General Surgery, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou 310016, China
2. Life Science College, Zhejiang Chinese Medical University, Hangzhou 310053, China
* Both authors have contributed equally to this work.

This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY-NC) License. See for full terms and conditions.
Yang J, Chen L, Xu B, Xu J, Sun J, Shen W, Zhang T. Intracellular Distributing and Interferon-γ Secretion of Human Interleukin-18 in BxPC-3 Cells. Int J Med Sci 2014; 11(2):172-179. doi:10.7150/ijms.6875. Available from

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Objective: To investigate the characteristics of interleukin-18 (IL-18) in vitro, explore IL-18, interferon-γ (IFN-γ) and interleukin-2 (IL-2) secretive activity in BxPC-3 line cells with interleukin-18 mutants.

Methods: Human IL-18 full-length gene (hIL-18-F) and the hIL-18 presumed mature protein gene (hIL-18-M) were inserted into the expression vector pEGFP-N1, to construct recombinant plasmids as Mu0, Mu1, Mu2, Mu3, and Mu4, and the recombinant plasmids were then transferred into BxPC-3 line cells. There are significant differences between Mu1, Mu2 and the pEGFP-C1 control group (P<0.05) by 3-(4,5-dimethiazol- 2-yl)- 2,5-diphenyltetrazolium bromide (MTT) for a proliferation assay, and the fluorescence of the Mu1 and Mu 2 appeared targeted to the membranous region in the BxPC-3 cells after transfected 24h by confocal laser scanning microscope (OLSM).To characterize the intracellular distribution of hIL-18, recombinant IL-18 were each fused to the enhanced green fluorescent protein gene, and expressed in BxPC-3 cells.

Results: Results showed that the Mu1 tended to the membranous region in BxPC-3 cells, this indicates that the N-terminal former amino acid peptide helped ChIL-18 target to BxPC-3 cellS membranes. ELISA results demonstrated that IFN-γ and IL-18 secreted levels of BxPC-3 cells transfecting with recombinant plasmid showed an significant difference (P<0.01); refers to IL-2 expression, the two BxPC-3 cells groups transfecting with recombinant plasmid have no significant function (P>0.05).

Conclusions: The results showed that hIL-18 and hIL-18 presumed mature protein can induce the secretion of IFN-γ in BxPC-3 cells, and increase the expression of IL-18, but they have no effects on IL-2.

Keywords: hIL-18 mutants, BxPC-3 cells, intracellular distribution, IFN-γ