Jump to Main Content
High level expression, purification, and in vivo activity of bovine granulocyte-colony stimulating factor produced using a baculovirus system
- Nagata, Tomoshi, Tohda, Yukihiko, Yokomizo, Yuichi, Nakamura, Masayuki, Takehara, Kazuaki
- Veterinary immunology and immunopathology 2003 v.96 no.1-2 pp. 105-110
- bioassays, cattle, complementary DNA, granulocyte colony-stimulating factor, neutrophils, nickel, phagocytosis, recombinant proteins
- A bovine granulocyte-colony stimulating factor (bG-CSF) cDNA clone bearing a C-terminal poly-His-tag (bG-CSFHis) was constructed and expressed by the baculovirus expression system. The bG-CSFHis was expressed as an approximately 19 kDa protein in the culture supernatants and was purified using a nickel chelate column. The purified bG-CSFHis had bioactivity in vitro in the NFS-60 bioassay. In order to evaluate activity in vivo, purified bG-CSFHis was administered to cattle as single or multiple dosages. The bG-CSFHis increased neutrophil counts in peripheral blood and modulated the phagocytic activity of the neutrophils. The data indicates that the recombinant protein had activity in vivo.