Advances in protein engineering have led to the development of proteins as therapeutic agents. However, a common complication is the reduction of efficacy due to antibody response. Factors that influence antibody response include protein aggregation, immunogenic sequences within the protein and the frequency of administration. The broad objective of this proposal is to improve therapeutic efficacy of biopharmaceuticals by developing lipid-protein complexes that will reduce immunogenicity and decrease the clearance of the protein, thereby reducing frequency of administration. Factor VIII (FVIII) offers an excellent opportunity to investigate such approaches, as the administration of exogenous FVIII leads to development of inhibitory antibody responses in 15-30% of Hemophilia A patients, complicating replacement therapy. The long term goal of the project is to develop lipidic complexes of FVIII that positively modulate immunogenicity and clearance. During the previous project period, rational approaches led to the development of FVIII- Phosphoserine (PS)complexes that showed reduction in immune response against the protein following its injection in Hemophilia A mice and improved physical stability. The molecular interaction of PS with FVIII and Calcium ions was exploited to develop lipid based nano/micro particulates including liposomes and novel condensed and nano-cochleate structures for FVIII delivery. In this proposal, we propose to investigate (1) the mechanism of reduction in immune response mediated by FVIM-PS complexes (2) the effect of low density receptor related protein and von Willebrand factor mediated clearance of FVIII and FVIII-PS complexes and (3) the effect of antibody response on clearance of FVIII and FVIII-PS complexes. The studies aimed at understanding the pharmacology of FVIII-PS complexes will be carried out in Hemophilia A mice model and in vitro with antigen presenting cells such as dendritic cells and T-cells. We propose to investigate key steps in the processing of protein antigen by the immune system in general, which include uptake and processing of FVIII by antigen presenting cells and subsequent presentation and expansion of T- cells. We will investigate the role of PS in modulating the immunogenicity of FVIII (Specific Aim 1). The pharmacokinetic properties of FVIII are complex due to intrinsic protein binding and we will investigate the disposition of FVIII and FVIII-PS complexes mediated by liver metabolism and immune system.
In specific aim 2, we will investigate the effect of PS binding and lipid molecular assemblies on pharmacokinetic parameters such as half-life, area under the curve and clearance. Finally, in specific aim 3, we will investigate the effect of antibody response and disposition of FVIII. The results obtained from these studies will be useful to develop optimal dosing and efficient management of the disease and therapy.

National Institute of Health (NIH)
National Heart, Lung, and Blood Institute (NHLBI)
Research Project (R01)
Project #
Application #
Study Section
Xenobiotic and Nutrient Disposition and Action Study Section (XNDA)
Program Officer
Link, Rebecca P
Project Start
Project End
Budget Start
Budget End
Support Year
Fiscal Year
Total Cost
Indirect Cost
State University of New York at Buffalo
Schools of Pharmacy
United States
Zip Code
Schneider, Jennifer L; Dingman, Robert K; Balu-Iyer, Sathy V (2017) Lipidic Nanoparticles Comprising Phosphatidylinositol Mitigate Immunogenicity and Improve Efficacy of Recombinant Human Acid Alpha-Glucosidase in a Murine Model of Pompe Disease. J Pharm Sci :
Ramakrishnan, Radha; Balu-Iyer, Sathy V (2016) Effect of Biophysical Properties of Phosphatidylserine Particle on Immune Tolerance Induction Toward Factor VIII in a Hemophilia A Mouse Model. J Pharm Sci 105:3039-3045
Shetty, Krithika A; Kosloski, Matthew P; Mager, Donald E et al. (2016) Factor VIII associated with lipidic nanoparticles retains efficacy in the presence of anti-factor VIII antibodies in hemophilia A mice. Biopharm Drug Dispos 37:409-420
Schneider, Jennifer L; Balu-Iyer, Sathy V (2016) Phosphatidylserine Converts Immunogenic Recombinant Human Acid Alpha-Glucosidase to a Tolerogenic Form in a Mouse Model of Pompe Disease. J Pharm Sci 105:3097-3104
Shetty, Krithika A; Merricks, Elizabeth P; Raymer, Robin et al. (2016) Soy Phosphatidylinositol-Containing Lipid Nanoparticle Prolongs the Plasma Survival and Hemostatic Efficacy of B-domain-Deleted Recombinant Canine Factor VIII in Hemophilia A Dogs. J Pharm Sci 105:2459-64
Ramakrishnan, Radha; Davidowitz, Andrew; Balu-Iyer, Sathy V (2015) Exposure of FVIII in the Presence of Phosphatidyl Serine Reduces Generation of Memory B-Cells and Induces Regulatory T-Cell-Mediated Hyporesponsiveness in Hemophilia A Mice. J Pharm Sci 104:2451-6
Gaitonde, Puneet; Purohit, Vivek S; Balu-Iyer, Sathy V (2015) Intravenous administration of Factor VIII-O-Phospho-L-Serine (OPLS) complex reduces immunogenicity and preserves pharmacokinetics of the therapeutic protein. Eur J Pharm Sci 66:157-62
Fathallah, Anas M; Balu-Iyer, Sathy V (2015) Anatomical, physiological, and experimental factors affecting the bioavailability of sc-administered large biotherapeutics. J Pharm Sci 104:301-6
Kelleher Jr, Raymond J; Balu-Iyer, Sathy; Loyall, Jenni et al. (2015) Extracellular Vesicles Present in Human Ovarian Tumor Microenvironments Induce a Phosphatidylserine-Dependent Arrest in the T-cell Signaling Cascade. Cancer Immunol Res 3:1269-78
Fathallah, Anas M; Turner, Michael R; Mager, Donald E et al. (2015) Effects of hypertonic buffer composition on lymph node uptake and bioavailability of rituximab, after subcutaneous administration. Biopharm Drug Dispos 36:115-25

Showing the most recent 10 out of 47 publications