Preparation of recombinant rat interleukin-5 by baculovirus expression system and analysis of its biological activities

Rat interleukin-5 (IL-5) cDNA was subcloned from peritoneal cells collected 4 h after intraperitoneal injection of Ascaris suum antigen solution into the immunized rats. Cysteine proteinase-deleted (CPd) rat IL-5 recombinant virus was constructed by inserting rat IL-5 cDNA into CPd virus having a de letion in the cysteine proteinase gene of the silkworm Bombyx mori nuclear polyhedrosis virus. On infection with the CPd rat IL-5 recombinant virus, t he silkworm B. mori larvae produced rat IL-5 as a dimeric form in hemolymph . Recombinant rat IL-5 was purified more than 95.5% by anion-exchange chrom atography and hydrophobic chromatography. The purified recombinant rat IL-5 promoted the proliferation of T88-M cells in a concentration-dependent man ner, and its effect was inhibited by an anti-murine IL-5 neutralizing polyc lonal antibody. When bone marrow cells from normal rats were incubated with recombinant rat IL-5 in medium containing methylcellulose, the colony form ation by eosinophilic cells was induced. Furthermore, when rat peritoneal e osinophils were incubated with recombinant rat IL-5, the spontaneous decrea se in the eosinophil viability was inhibited in time- and concentration-dep endent manners. In addition, the recombinant rat IL-5-induced eosinophil su rvival was inhibited by an anti-murine IL-5 neutralizing polyclonal antibod y. These findings suggest that rat IL-5 acts as B-cell growth factor II (BC GF-II), eosinophil differentiation factor (EDF), and eosinophil survival-en hancing factor. (C) 1999 Elsevier Science B.V. All rights reserved.