Isolation of a High Molecular Mass Granulocyte Colony-Stimulating Factor from Bovine Lung Conditioned Medium

Abstract
A high-molecular mass type of granulocyte colony-stimulating factor (CSF-F) from bovine lung tissue produced by fibroblasts was isolated and partially purified by a 4-step procedure. Following ammonium sulfate fractionation, hydrophobic interaction, ion-exchange and affinity chromatography, CSF-F was > 200-fold enriched. CSF-F was a glycoprotein of .apprx. 68 kDa [kilodalton] with an isoelectric point of 4.0-5.2. It did not lose its biological activity after neuraminidase treatment. Gel-filtration behavior of desialo-CSF-F was not changed.