Abstract:
:We have isolated and sequenced a cDNA that contains the coding sequence of porcine interleukin 18 (IL-18) and the recombinant protein of porcine IL-18 was expressed using the baculovirus system. The open reading frame (ORF) of the porcine IL-18 cDNA is 579 base pairs (bp) in length and encodes 192 amino acids. The predicted amino acid sequence is 76.7%, 64.7% and 61.6% homologous to the predicted human, murine and rat amino acid sequences, respectively. The porcine precursor and mature IL-18 protein were expressed respectively in Trichoplusia ni -derived (Tn5) cells using the baculovirus Autografha californica nuclear polyhedorosis virus (AcNPV) as a vector. Tn5 cells infected with recombinant virus containing a whole IL-18 protein coding region sequence secreted porcine precursor IL-18 into the culture medium. On the other hand, Tn5 cells infected with recombinant virus containing a mature IL-18 protein coding region sequence expressed several proteins in the cell lysates, but did not secrete mature protein into the culture medium efficiently. Immunoblotting analysis of recombinant protein showed cross-reactivity with anti-human IL-18 polyclonal antibody. The mature form of porcine IL-18 protein induced IFN-gamma production in suboptimal doses of anti-CD3 antibody and concanavalin A- (ConA) stimulated porcine peripheral blood mononuclear cells (PBMC), but the precursor form had little effect.
journal_name
Cytokinejournal_title
Cytokineauthors
Muneta Y,Mori Y,Shimoji Y,Yokomizo Ydoi
10.1006/cyto.1999.0648keywords:
subject
Has Abstractpub_date
2000-06-01 00:00:00pages
566-72issue
6eissn
1043-4666issn
1096-0023pii
S1043-4666(99)90648-8journal_volume
12pub_type
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