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Development of a baculovirus expression system for soluble porcine tumor necrosis factor receptor type I and soluble porcine tumor necrosis factor receptor type I-IgG fusion protein


Development of a baculovirus expression system for soluble porcine tumor necrosis factor receptor type I and soluble porcine tumor necrosis factor receptor type I-IgG fusion protein



Veterinary Immunology and Immunopathology 86(3-4): 251-254



ISSN/ISBN: 0165-2427

PMID: 12007891

DOI: 10.1016/s0165-2427(02)00034-x

Tumor necrosis factor-alpha (TNF-alpha) is a key mediator of inflammatory responses and gram-negative bacterial sepsis, but the role that it plays during Salmonella enterica species bacterial infections in swine has not yet been elucidated. To facilitate studies on the role of TNF-alpha on the pathology associated with Salmonella infections in pigs, recombinant soluble porcine TNF receptor type I (rspTNF-RI) and soluble TNF receptor type I fused to the Fc region of porcine IgG1 (rspTNF-RI-IgG) were expressed in insect cells using a baculovirus expression system. The proteins were secreted into the cell culture media and purified by anti-soluble porcine TNF-RI antibody and protein G affinity chromatography, respectively. The yield of protein using this method was approximately 1.5mg rspTNF-RI and 4mg rspTNF-RI-IgG/L of cell culture medium. In in vitro assays, rspTNF-RI-IgG was approximately 10-fold (0.97 vs. 10.00pmol/ml) more effective than rspTNF-RI at completely inhibiting the cytotoxic activity of 500U of recombinant porcine TNF-alpha on 3 x 10(4) WEHI 164 murine fibrosarcoma, clone 13, cells. Compared to previously described methods, this method yields significantly more biologically active rspTNF-RI.

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Accession: 003708625

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