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  1. Article ; Online: Phospholipid binding improves plasma survival of factor VIII.

    Pisal, Dipak S / Balu-Iyer, Sathy V

    Thrombosis and haemostasis

    2010  Volume 104, Issue 5, Page(s) 1073–1075

    MeSH term(s) Animals ; Area Under Curve ; Coagulants/administration & dosage ; Coagulants/pharmacokinetics ; Disease Models, Animal ; Factor VIII/administration & dosage ; Factor VIII/pharmacokinetics ; Half-Life ; Hemophilia A/blood ; Hemophilia A/drug therapy ; Metabolic Clearance Rate ; Mice ; Mice, Knockout ; Phosphatidylinositols/administration & dosage ; Phosphatidylinositols/pharmacokinetics ; Phospholipids/administration & dosage ; Phospholipids/pharmacokinetics ; von Willebrand Factor/genetics ; von Willebrand Factor/metabolism
    Chemical Substances Coagulants ; Phosphatidylinositols ; Phospholipids ; von Willebrand Factor ; Factor VIII (9001-27-8)
    Language English
    Publishing date 2010-09-13
    Publishing country Germany
    Document type Letter ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 518294-3
    ISSN 2567-689X ; 0340-6245
    ISSN (online) 2567-689X
    ISSN 0340-6245
    DOI 10.1160/TH10-06-0422
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Nonlinear pharmacokinetics of factor VIII and its phosphatidylinositol lipidic complex in hemophilia A mice.

    Kosloski, Matthew P / Pisal, Dipak S / Mager, Donald E / Balu-Iyer, Sathy V

    Biopharmaceutics & drug disposition

    2014  Volume 35, Issue 3, Page(s) 154–163

    Abstract: Factor VIII (FVIII) is an important cofactor in the blood coagulation cascade and its deficiency or dysfunction causes hemophilia A (HA), a bleeding disorder. Replacement with recombinant FVIII is limited by a short half-life and the development of ... ...

    Abstract Factor VIII (FVIII) is an important cofactor in the blood coagulation cascade and its deficiency or dysfunction causes hemophilia A (HA), a bleeding disorder. Replacement with recombinant FVIII is limited by a short half-life and the development of inhibitory antibodies. A phosphatidylinositol (PI) containing lipid nanoparticle was developed that, when associated with FVIII, reduces immunogenicity and prolongs circulation of the therapeutic protein in HA mice. A multiple dose level pharmacokinetic (PK) study of human free FVIII and its FVIII-PI complex over a clinically relevant range of doses (20, 40 and 200 IU/kg) was conducted in HA mice to investigate linearity of the PK and to determine if the reduced catabolism of FVIII following association with PI particles, previously only observed in the terminal phase following 400 IU/kg, could be extendable over a range of doses. The findings suggest that the disposition of FVIII is best characterized by a two-compartment model with saturable Michaelis-Menten elimination. Spontaneous complexation of FVIII with PI particles significantly increases plasma survival of the protein at 20 and 40 IU/kg doses. Human simulations at 40 IU/kg project an increase in the terminal half-life and the time to reach a minimum therapeutic threshold of 0.01 IU/ml of 5.4 h and 40 h, respectively, compared with free FVIII. Formulation with PI containing lipid particles may represent a viable delivery strategy for improving FVIII therapy.
    MeSH term(s) Animals ; Disease Models, Animal ; Dose-Response Relationship, Drug ; Factor VIII/administration & dosage ; Factor VIII/chemistry ; Factor VIII/pharmacokinetics ; Half-Life ; Hemophilia A/drug therapy ; Humans ; Lipids/chemistry ; Male ; Mice ; Mice, Inbred C57BL ; Nanoparticles ; Phosphatidylinositols/chemistry
    Chemical Substances Lipids ; Phosphatidylinositols ; Factor VIII (9001-27-8)
    Language English
    Publishing date 2014-01-02
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 603014-2
    ISSN 1099-081X ; 0142-2782
    ISSN (online) 1099-081X
    ISSN 0142-2782
    DOI 10.1002/bdd.1880
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Phospholipid binding lowers immunogenicity of human recombinant factor VIII in von Willebrand factor knockout mice

    Pisal, Dipak S. / Balu-Iyer, Sathy V.

    Thrombosis and Haemostasis

    2011  Volume 105, Issue 06, Page(s) 1115–1118

    Language English
    Publishing date 2011-01-01
    Publisher Schattauer GmbH
    Publishing place Stuttgart ; New York
    Document type Article
    ZDB-ID 518294-3
    ISSN 2567-689X ; 0340-6245
    ISSN (online) 2567-689X
    ISSN 0340-6245
    DOI 10.1160/TH10-09-0628
    Database Thieme publisher's database

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  4. Article: Phospholipid binding improves plasma survival of factor VIII

    Pisal, Dipak S. / Balu-Iyer, Sathy V.

    Thrombosis and Haemostasis

    2010  Volume 103, Issue 11, Page(s) 1073–1075

    Language English
    Publishing date 2010-01-01
    Publisher Schattauer GmbH
    Publishing place Stuttgart ; New York
    Document type Article
    ZDB-ID 518294-3
    ISSN 2567-689X ; 0340-6245
    ISSN (online) 2567-689X
    ISSN 0340-6245
    DOI 10.1160/TH10-06-0422
    Database Thieme publisher's database

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  5. Article ; Online: Phosphatidylinositol induces fluid phase formation and packing defects in phosphatidylcholine model membranes.

    Peng, Aaron / Pisal, Dipak S / Doty, Amy / Balu-Iyer, Sathy V

    Chemistry and physics of lipids

    2011  Volume 165, Issue 1, Page(s) 15–22

    Abstract: Liposomes consisted of phosphatidylinositol (PI) and phosphatidylcholine (PC) have been utilized as delivery vehicle for drugs and proteins. In the present work, we studied the effect of soy PI on physical properties of 1,2-dimyristoyl-sn-glycero-3- ... ...

    Abstract Liposomes consisted of phosphatidylinositol (PI) and phosphatidylcholine (PC) have been utilized as delivery vehicle for drugs and proteins. In the present work, we studied the effect of soy PI on physical properties of 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) liposomes such as phase state of lipid bilayer, lipid packing and phase properties using multiple orthogonal biophysical techniques. The 6-dodecanoyl-2-dimethylamino naphthalene (Laurdan) fluorescence studies showed that presence of PI induces the formation of fluid phases in DMPC. Differential scanning calorimetry (DSC), temperature dependent fluorescence anisotropy measurements, and generalized polarization values for Laurdan showed that the presence of as low as 10mol% of PI induces substantial broadening and shift to lower temperature of phase transition of DMPC. The fluorescence emission intensity of DPH labeled, PI containing DMPC lipid bilayer decreased possibly due to deeper penetration of water molecules in lipid bilayer. In order to further delineate the effect of PI on the physico chemical properties of DMPC is due to either significant hydrophobic mismatch between the acyl chains of the DMPC and that of soy PI or due to the inositol head group, we systematically replaced soy PI with PC species of similar acyl chain composition (DPPC and 18:2 (Cis) PC) or with diacylglycerol (DAG), respectively. The anisotropy of PC membrane containing soy PI showed largest fluidity change compared to other compositions. The data suggests that addition of PI alters structure and dynamics of DMPC bilayer in that it promotes deeper water penetration in the bilayer, induces fluid phase characteristics and causes lipid packing defects that involve its inositol head group.
    MeSH term(s) 2-Naphthylamine/analogs & derivatives ; 2-Naphthylamine/chemistry ; Calorimetry, Differential Scanning ; Dimyristoylphosphatidylcholine/chemistry ; Laurates/chemistry ; Lipid Bilayers/chemistry ; Liposomes/chemistry ; Models, Molecular ; Phase Transition ; Phosphatidylcholines/chemistry ; Phosphatidylinositols/chemistry ; Spectrometry, Fluorescence ; Transition Temperature
    Chemical Substances Laurates ; Lipid Bilayers ; Liposomes ; Phosphatidylcholines ; Phosphatidylinositols ; 2-Naphthylamine (CKR7XL41N4) ; Dimyristoylphosphatidylcholine (U86ZGC74V5) ; laurdan (Y97FBL93VW)
    Language English
    Publishing date 2011-10-17
    Publishing country Ireland
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 213869-4
    ISSN 1873-2941 ; 0009-3084
    ISSN (online) 1873-2941
    ISSN 0009-3084
    DOI 10.1016/j.chemphyslip.2011.10.002
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Allometry of factor VIII and informed scaling of next-generation therapeutic proteins.

    Kosloski, Matthew P / Pisal, Dipak S / Mager, Donald E / Balu-Iyer, Sathy V

    Journal of pharmaceutical sciences

    2013  Volume 102, Issue 7, Page(s) 2380–2394

    Abstract: Allometric scaling has been applied to the pharmacokinetics (PK) of factor VIII (FVIII), but published relationships are based on relatively small subsets of available data. Numerous next-generation forms of FVIII are being developed (e.g., Fc fusion, ... ...

    Abstract Allometric scaling has been applied to the pharmacokinetics (PK) of factor VIII (FVIII), but published relationships are based on relatively small subsets of available data. Numerous next-generation forms of FVIII are being developed (e.g., Fc fusion, PEGylated, and liposomal formulations) and traditional PK scaling of these products would not incorporate the wealth of existing knowledge for current FVIII therapy in humans. We conducted a meta-analysis and developed allometric relationships of FVIII from over 100 PK studies collected from literature. Normalized Wajima curves were used to relate mean FVIII profiles between species. An "informed scaling" approach was derived for predicting first-in-human PK parameters and demonstrated with a case study for an Fc fusion FVIII. NCA values for FVIII PK were well described by the allometric equations CL = 6.59 W(0.85) and V(ss) = 65.0 W(0.97). A subset of studies characterized by two-compartment modeling showed strong linearity in scaling of total clearance (CL) and central volume, but more variability in distributional CL and peripheral volume. Wajima curves for FVIII superimposed across species and the disposition of Fc fusion FVIII in humans was well predicted by "informed scaling." This approach might be generally applicable for predicting human PK of next-generational therapeutics.
    MeSH term(s) Animals ; Coagulants/pharmacokinetics ; Computer Simulation ; Dogs ; Factor VIII/pharmacokinetics ; Haplorhini ; Humans ; Mice ; Models, Biological ; Rabbits ; Rats ; Recombinant Proteins/pharmacokinetics ; Species Specificity
    Chemical Substances Coagulants ; Recombinant Proteins ; Factor VIII (9001-27-8)
    Language English
    Publishing date 2013-04-25
    Publishing country United States
    Document type Journal Article ; Meta-Analysis ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 3151-3
    ISSN 1520-6017 ; 0022-3549
    ISSN (online) 1520-6017
    ISSN 0022-3549
    DOI 10.1002/jps.23566
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Delivery of therapeutic proteins.

    Pisal, Dipak S / Kosloski, Matthew P / Balu-Iyer, Sathy V

    Journal of pharmaceutical sciences

    2010  Volume 99, Issue 6, Page(s) 2557–2575

    Abstract: The safety and efficacy of protein therapeutics are limited by three interrelated pharmaceutical issues, in vitro and in vivo instability, immunogenicity and shorter half-lives. Novel drug modifications for overcoming these issues are under investigation ...

    Abstract The safety and efficacy of protein therapeutics are limited by three interrelated pharmaceutical issues, in vitro and in vivo instability, immunogenicity and shorter half-lives. Novel drug modifications for overcoming these issues are under investigation and include covalent attachment of poly(ethylene glycol) (PEG), polysialic acid, or glycolic acid, as well as developing new formulations containing nanoparticulate or colloidal systems (e.g., liposomes, polymeric microspheres, polymeric nanoparticles). Such strategies have the potential to develop as next generation protein therapeutics. This review includes a general discussion on these delivery approaches.
    MeSH term(s) Chemistry, Pharmaceutical ; Half-Life ; Humans ; Liposomes/pharmacokinetics ; Microspheres ; Nanoparticles/chemistry ; Polyethylene Glycols/chemistry ; Polymers/chemistry ; Proteins/administration & dosage ; Sialic Acids
    Chemical Substances Liposomes ; Polymers ; Proteins ; Sialic Acids ; polysialic acid ; Polyethylene Glycols (3WJQ0SDW1A)
    Language English
    Publishing date 2010-01-04
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 3151-3
    ISSN 1520-6017 ; 0022-3549
    ISSN (online) 1520-6017
    ISSN 0022-3549
    DOI 10.1002/jps.22054
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Native-like aggregates of factor VIII are immunogenic in von Willebrand factor deficient and hemophilia a mice.

    Pisal, Dipak S / Kosloski, Matthew P / Middaugh, C Russell / Bankert, Richard B / Balu-Iyer, Sathy V

    Journal of pharmaceutical sciences

    2012  Volume 101, Issue 6, Page(s) 2055–2065

    Abstract: The administration of recombinant factor VIII (FVIII) is the first-line therapy for hemophilia A (HA), but 25%-35% of patients develop an inhibitory antibody response. In general, the presence of aggregates contributes to unwanted immunogenic responses ... ...

    Abstract The administration of recombinant factor VIII (FVIII) is the first-line therapy for hemophilia A (HA), but 25%-35% of patients develop an inhibitory antibody response. In general, the presence of aggregates contributes to unwanted immunogenic responses against therapeutic proteins. FVIII has been shown to form both native-like and nonnative aggregates. Previously, we showed that nonnative aggregates of FVIII are less immunogenic than the native protein. Here, we investigated the effect of native-like aggregates of FVIII on immunogenicity in HA and von Willebrand factor knockout (vWF(-/-)) mice. Mice immunized with native-like aggregates showed significantly higher inhibitory antibody titers than animals that received native FVIII. Following restimulation in vitro with native FVIII, the activation of CD4+ T-cells isolated from mice immunized with native-like aggregates is approximately fourfold higher than mice immunized with the native protein. Furthermore, this is associated with increases in the secretion of proinflammatory cytokines IL-6 and IL-17 in the native-like aggregate treatment group. The results indicate that the native-like aggregates of FVIII are more immunogenic than native FVIII for both the B-cell and the T-cell responses.
    MeSH term(s) Animals ; Enzyme-Linked Immunosorbent Assay ; Factor VIII/genetics ; Factor VIII/immunology ; Hemophilia A/genetics ; Mice ; von Willebrand Factor/genetics
    Chemical Substances von Willebrand Factor ; Factor VIII (9001-27-8)
    Language English
    Publishing date 2012-03-02
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 3151-3
    ISSN 1520-6017 ; 0022-3549
    ISSN (online) 1520-6017
    ISSN 0022-3549
    DOI 10.1002/jps.23091
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Transport of surface engineered polyamidoamine (PAMAM) dendrimers across IPEC-J2 cell monolayers.

    Pisal, Dipak S / Yellepeddi, Venkata K / Kumar, Ajay / Palakurthi, Srinath

    Drug delivery

    2008  Volume 15, Issue 8, Page(s) 515–522

    Abstract: The aim of our study was to prepare arginine-and ornithine-conjugated Polyamidoamine (PAMAM) dendrimers and study their permeability across IPEC-J2 cell monolayers, a new intestinal cell line model for drug absorption studies. Arginine and ornithine were ...

    Abstract The aim of our study was to prepare arginine-and ornithine-conjugated Polyamidoamine (PAMAM) dendrimers and study their permeability across IPEC-J2 cell monolayers, a new intestinal cell line model for drug absorption studies. Arginine and ornithine were conjugated to the amine terminals of the PAMAM(G4) dendrimers by Fmoc synthesis. The apical-to-basolateral (AB) and basolateral-to-apical (BA) apparent permeability coefficients (P(app)) for the PAMAM dendrimers increased by conjugating the dendrimers with both of these polyamines. The enhancement in permeability was dependent on the dendrimer concentration and duration of incubation. Correlation between monolayer permeability and the decrease in transepithelial electrical resistance (TEER) with the PAMAM dendrimers and the polyamine-conjugated dendrimers suggests that paracellular transport is one of the mechanisms of transport across the epithelial cells. Cytotoxicity of these surface-modified dendrimers was evaluated in IPEC-J2 cells by MTT (methylthiazoletetrazolium) assay. Arginine-conjugated dendrimers were insignificantly more toxic than PAMAM dendrimer as well as ornithine-conjugated dendrimers. Though investigations on the possible involvement of other transport mechanisms are in progress, results of the present study suggest the potential of dendrimer-polyamine conjugates as the carriers for antigen/drug delivery through the oral mucosa.
    MeSH term(s) Animals ; Biological Transport, Active ; Cell Line ; Cell Membrane Permeability ; Dendrimers/chemistry ; Dendrimers/pharmacokinetics ; Dendrimers/toxicity ; Drug Carriers/chemistry ; Drug Carriers/pharmacokinetics ; Drug Carriers/toxicity ; Electric Impedance ; Epithelial Cells/metabolism ; Polyamines/chemistry ; Polyamines/pharmacokinetics ; Polyamines/toxicity
    Chemical Substances Dendrimers ; Drug Carriers ; PAMAM Starburst ; Polyamines
    Language English
    Publishing date 2008-07-31
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 1213261-5
    ISSN 1521-0464 ; 1071-7544
    ISSN (online) 1521-0464
    ISSN 1071-7544
    DOI 10.1080/10717540802321826
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: A Novel Pharmacokinetic Bridging Strategy to Support a Change in the Route of Administration for Biologics.

    Ji, Ping / Nikolov, Nikolay / Seymour, Sally / Glaser, Rachel / Ren, Yupeng / Li, Liang / Marathe, Anshu / Ren, Yunzhao / Chen, Jianmeng / He, Lei / Pisal, Dipak / Yapa, Shalini Wickramaratne Senarath / Wang, Yaning / Sahajwalla, Chandrahas

    Journal of pharmaceutical sciences

    2019  Volume 108, Issue 7, Page(s) 2490–2499

    Abstract: Determination of appropriate pharmacokinetic end point to bridge different dosing regimens is often a challenge when developing a new route of administration. Trough concentrations ( ... ...

    Abstract Determination of appropriate pharmacokinetic end point to bridge different dosing regimens is often a challenge when developing a new route of administration. Trough concentrations (C
    MeSH term(s) Administration, Intravenous/methods ; Antirheumatic Agents/administration & dosage ; Antirheumatic Agents/pharmacokinetics ; Arthritis, Rheumatoid/drug therapy ; Biological Products/administration & dosage ; Biological Products/pharmacokinetics ; Humans ; Injections, Subcutaneous/methods
    Chemical Substances Antirheumatic Agents ; Biological Products
    Language English
    Publishing date 2019-03-12
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3151-3
    ISSN 1520-6017 ; 0022-3549
    ISSN (online) 1520-6017
    ISSN 0022-3549
    DOI 10.1016/j.xphs.2019.02.027
    Database MEDical Literature Analysis and Retrieval System OnLINE

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