Abstract

CADIZ LAHENS, Armando et al. Purification of recombinant factor IX expressed in milk of transgenic sows. Rev Cubana Hematol Inmunol Hemoter [online]. 2006, vol.22, n.2, pp. 0-0. ISSN 1561-2996.

Recombinant factor IX was purified from milk of transgenic sows, and yieldings between 1 and 2 g of this protein per liter were obtained. This is a new way to get this product with a high efficiency, since its expression is 1 000 times higher than of the human plasmatic factor IX. By combining 2 chromatographic steps (ion exchange in DEAE-Shephadex A-50 and affinity chromatography with heparin), the factor IX was purified, with this milk as a starting material. Different methods were studied to eliminate caseins, the main pollutant of the process, and ultracentrifugation was selected due to its numerous advantages over the isoelectric precipitation and salt precipitation. Factor IX may be purified from transgenic milk with an elevated purity by chromatographic methods that do not use immunoaffinity and are finally scalable in industrial production, which provides new perspectives for treating hemophilia B by preparing new oral formulations

Keywords : Factor IX; purification; hemophilia B.