Abstract
LIGHT is a member of the tumor necrosis factor ligand superfamily, which plays important roles in inflammatory and immune responses. LIGHT forms a membrane-anchored homotrimeric complex on the cell surface and is often processed as a soluble protein. Recombinant soluble human LIGHT produced by mammalian cells or Escherichia coli is functional at nanomolar concentrations. However, there is little information about the biological activity of mouse LIGHT (mLIGHT) because of the difficulty in producing bioactive soluble mLIGHT. In this study, recombinant trimeric soluble mLIGHT, or Foldon-mLIGHT, was produced by fusing mLIGHT with the trimerization domain foldon from bacteriophage T4 fibritin. Foldon-mLIGHT was secreted from 293F cells as a 68-kDa trimeric protein. The recombinant protein potently inhibited the growth of the FM3A mouse mammary carcinoma cell line with an IC50 of 77 pM; however, the monomer or dimer forms of mLIGHT produced by E. coli or mammalian cell systems showed weak or no inhibitory activity. These data clearly indicated that trimerization of soluble mLIGHT is essential for its biological activity.
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Acknowledgments
We thank Drs. Odaka H., Nagaya H., Kokubo T., Mori M., Takizawa M., Fujitani Y., Tsuchimori N., Goto M., and Mori T. of the Takeda Pharmaceutical Co. Ltd. for their interest, helpful discussions, and comments.
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Ito, T., Iwamoto, K., Tsuji, I. et al. Trimerization of murine TNF ligand family member LIGHT increases the cytotoxic activity against the FM3A mammary carcinoma cell line. Appl Microbiol Biotechnol 90, 1691–1699 (2011). https://doi.org/10.1007/s00253-011-3168-8
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DOI: https://doi.org/10.1007/s00253-011-3168-8