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  • Treatment with a fusion protein of the extracellular domains of NKG2D to IL-15 retards colon cancer growth in mice.

Treatment with a fusion protein of the extracellular domains of NKG2D to IL-15 retards colon cancer growth in mice.

Journal of immunotherapy (Hagerstown, Md. : 1997) (2014-05-09)
Yan Xia, Bei Chen, Xiaoqing Shao, Weiming Xiao, Li Qian, Yanbing Ding, Mingchun Ji, Weijuan Gong
ABSTRACT

Tumor-targeted cytokines are a new class of pharmaceutical anticancer agents often considered superior to the corresponding unconjugated cytokines for therapeutic purposes. We generated a new fusion protein, dsNKG2D-IL-15, in which double NKG2D extracellular domains were fused to IL-15, in Escherichia coli. This fusion protein promoted the activation, proliferation, and cytotoxicity of NK cells, and bound to NKG2D ligand-positive tumor cells. These tumor cells were also more susceptible to NK-cell attack when decorated with dsNKG2D-IL-15. The administration of mouse dsNKG2D-IL-15 protein in vivo significantly retarded the growth of transplanted colon cancers and prolonged the survival of tumor-bearing mice. Treatment with dsNKG2D-IL-15 increased the frequencies of NK and CD8 T cells in spleen and tumor tissues. The antitumor effect mediated by dsNKG2D-IL-15 was significantly decreased with in vivo depletion of NK cells or CD8 T cells. Recombinant dsNKG2D-IL-15 thus inhibited NKG2D ligand-positive tumor growth effectively by activating lymphocytes. This new biological fusion protein could potentially be used to elicit immunity in tumor-targeting treatments.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Brefeldin A, ≥99% (HPLC and TLC), BioXtra, for molecular biology
Sigma-Aldrich
Brefeldin A, from Penicillium brefeldianum, ≥99% (HPLC and TLC)
Sigma-Aldrich
Brefeldin A, from Penicillium brefeldianum, Ready Made Solution, 10 mg/mL in DMSO
Sigma-Aldrich
IL-15 from mouse, recombinant, expressed in E. coli, ≥98% (SDS-PAGE), ≥98% (HPLC)
Sigma-Aldrich
Human IL-15 ELISA Kit, for serum, plasma, cell culture supernatant and urine
Sigma-Aldrich
Mouse IL-15 ELISA Kit, for serum, plasma and cell culture supernatant