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  • Discovery of An Orally Effective Factor IX-Transferrin Fusion Protein for Hemophilia B.

Discovery of An Orally Effective Factor IX-Transferrin Fusion Protein for Hemophilia B.

International journal of molecular sciences (2019-12-22)
Chen Xie, Zhijun Wang, Yang Su, Jeffrey Wang, Wei-Chiang Shen
ABSTRACT

Hemophilia B is a severe blood clotting disorder caused by the deficiency of factor IX (FIX). FIX is not bioavailable when given orally due to poor stability and permeability in the gastrointestinal tract. The feasibility of fusing FIX with transferrin (Tf) to enhance the oral bioavailability of FIX is explored. Seven recombinant fusion proteins (rFIX-Tf) with different linkers were constructed and expressed in HEK293 cells and characterized by in vitro transcytosis and transferrin receptor (TfR) binding assay in Caco-2 cells and a one-stage clotting assay. The in vivo efficacy study was performed using a tail-bleeding model in hemophilia B mice. Fusion proteins rFIX-Tf/G2 and rFIX-Tf/SVSQ were most permeable and showed a specific binding ability to TfR in Caco-2 cells. Both proteins retained FIX activity in clotting generation. The in vivo efficacy study showed that both proteins by intravenous injection significantly reduced blood loss. Most significantly, rFIX-Tf/G2 demonstrated anti-bleeding activity when administered orally. Our results showed that the fusion protein technique with Tf could be potentially used for oral delivery of FIX and the linker between FIX and Tf in the fusion protein is crucial. rFIX-Tf/G2 appears to be the most promising fusion protein as potential oral therapeutics for hemophilia B.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Anti-TF antibody produced in rabbit, Ab2, Prestige Antibodies® Powered by Atlas Antibodies, affinity isolated antibody, buffered aqueous glycerol solution
CellCrown inserts, 6 well plate inserts with 1.0 μm polycarbonate filter, sterile