USRE49529E1 - Methods of treating tissue calcification - Google Patents

Methods of treating tissue calcification Download PDF

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USRE49529E1
USRE49529E1 US17/111,156 US201517111156A USRE49529E US RE49529 E1 USRE49529 E1 US RE49529E1 US 201517111156 A US201517111156 A US 201517111156A US RE49529 E USRE49529 E US RE49529E
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npp1
snpp1
ppi
calcification
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Anthony Quinn
Nelson Hsia
Tayeba Khan
Kim Lynette Askew
Gregory Grabowski
Zhiliang Cheng
W. Charles O'Neill
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Inozyme Pharma Inc
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Inozyme Pharma Inc
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00—Medicinal preparations containing peptides
    • A61K38/16—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • A61K38/43—Enzymes; Proenzymes; Derivatives thereof
    • A61K38/46—Hydrolases (3)
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P13/00—Drugs for disorders of the urinary system
    • A61P13/12—Drugs for disorders of the urinary system of the kidneys
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P3/00—Drugs for disorders of the metabolism
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P9/00—Drugs for disorders of the cardiovascular system
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
    • C12N9/14—Hydrolases (3)
    • C12N9/16—Hydrolases (3) acting on ester bonds (3.1)
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Y—ENZYMES
    • C12Y301/00—Hydrolases acting on ester bonds (3.1)
    • C12Y301/04—Phosphoric diester hydrolases (3.1.4)
    • C12Y301/04001—Phosphodiesterase I (3.1.4.1)
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Y—ENZYMES
    • C12Y306/00—Hydrolases acting on acid anhydrides (3.6)
    • C12Y306/01—Hydrolases acting on acid anhydrides (3.6) in phosphorus-containing anhydrides (3.6.1)
    • C12Y306/01009—Nucleotide diphosphatase (3.6.1.9), i.e. nucleotide-pyrophosphatase
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2319/00—Fusion polypeptide
    • C07K2319/30—Non-immunoglobulin-derived peptide or protein having an immunoglobulin constant or Fc region, or a fragment thereof, attached thereto

Definitions

  • Vascular calcification can be characterized by formation of very small, dispersed crystals of hydroxyapatite (HA) and as large calcified deposits in vascular tissue, such as arteries.
  • HA hydroxyapatite
  • Extracellular pyrophosphate (PPi) is a key endogenous inhibitor of vascular calcification by inhibiting HA formation.
  • Ectonucleotide pyrophosphatase pyrophosphorylase is an ectoenzyme that cleaves ATP to produce extracellular pyrophosphate (PPi).
  • Pyrophosphate is a potent inhibitor of hydroxyapatite formation and, under normal conditions, functions to inhibit vascular calcification.
  • NPP1 Deficiency of NPP1 in humans results in reduced circulating PPi levels and has been implicated in conditions such as arterial calcification and generalized arterial calcification of infancy (GACI).
  • GACI arterial calcification and generalized arterial calcification of infancy
  • vascular calcification is also a well-recognized and common complication in chronic kidney disease (CKD) and end-stage renal disease (ESRD) subjects, and is associated with increased morbidity and mortality.
  • CKD chronic kidney disease
  • ESRD end-stage renal disease
  • Ectonucleotide pyrophosphatase/phosphodiesterase 1 (NPP1/ENPP1/PC-1) deficiency is a rare disease caused by mutations in NPP1, a type II transmembrane glycoprotein.
  • NPP1 cleaves a variety of substrates, including phosphodiester bonds of nucleotides and nucleotide sugars and pyrophosphate bonds of nucleotides and nucleotide sugars.
  • NPP1 deficiency has been associated with idiopathic infantile arterial calcification (IIAC), insulin resistance, hypophosphatemic rickets, and ossification of the posterior longitudinal ligament of the spine.
  • IIAC a rare autosomal recessive and nearly always fatal disorder, is characterized by calcification of the internal elastic lamina of muscular arteries and stenosis due to myointimal proliferation. There are more than 160 cases of IIAC that have been reported world-wide. The symptoms of the disease most often appear by early infancy, and the disease is lethal by 6 months of age, generally because of ischemic cardiomyopathy, and other complications of obstructive arteriopathy including renal artery stenosis.
  • NPP1 protein Although defects in the NPP1 protein have been implicated in such serious disease as IIAC, currently no treatment is available for those who are affected by the disease and other calcification diseases caused by high total body burden of calcium and phosphorus due to abnormal bone metabolism; low levels of circulating and locally produced inhibitors of phosphate producers; or impaired renal excretion.
  • bisphosphonates also inhibit bone formation. Bisphosphonates can delay but not stop calcification in subjects with GACI (Rutsch, F. et al., Circ Cardiovasc Genet 2008, 1, 133-140), and, as in animals, lead to osteomalacia. (Otero, J. E., et al., J Bone Miner Res 2013, 28, 419-430).
  • the present invention relates to uses of isolated recombinant human soluble NPP1 that lacks N-terminal cytosolic and transmembrane domains and fusion proteins thereof for the treatment of NPP1-deficiency or other progressive disorders characterized by the accumulation of deposits of calcium and other minerals.
  • the proteins of the invention can be surprisingly used to restore blood NPP1 activity and restore normal level of pyrophosphate in subjects having deficiencies in NPP1 activity or exhibiting accumulation of calcium deposits in the bones, joints, heart, blood vessels, eyes, and/or the skin.
  • the NPP1 proteins and NPP1 fusion proteins of the invention can be used to treat subjects having NPP1-deficiency or other diseases or disorders associated with low levels of pyrophosphate, including but not limited to, idiopathic infantile arterial calcification (IIAC, also known as general arterial calcification in infants), vascular calcification in chronic kidney disease (VCCKD), pseudoxanthoma elasticum (PXE), insulin resistance, hypophosphatemic rickets, joint calcification, myocardial ischemia, and ossification of the posterior longitudinal ligament of the spine.
  • IIAC idiopathic infantile arterial calcification
  • VCKD chronic kidney disease
  • PXE pseudoxanthoma elasticum
  • insulin resistance hypophosphatemic rickets
  • joint calcification myocardial ischemia
  • myossification of the posterior longitudinal ligament of the spine any progressive disorder that is characterized by the accumulation of deposits of calcium and other minerals in arterial and/or connective tissues are within the scope of
  • the invention relates to a method of reducing tissue calcification, preferably vascular calcification in a subject in need thereof.
  • the method comprises administering to a subject with low plasma pyrophosphate (PPi) or elevated inorganic phosphate (Pi), two or more doses of a therapeutically effective amount of a composition comprising a soluble ectonucleotide pyrophosphatase phosphodiesterase (NPP1).
  • PPi low plasma pyrophosphate
  • Pi elevated inorganic phosphate
  • NPP1 soluble ectonucleotide pyrophosphatase phosphodiesterase
  • Each dose contains an amount of soluble NPP1 that is sufficient to achieve a transient increase in plasma PPi in the subject.
  • the transient increase in plasma PPi characterized by a peak PPi level that is at least about 40% of the normal plasma PPi level and a return to base-line PPi level within about 48 hours after administration of the dose.
  • the time period between doses is at least 2 days.
  • the transient increase in plasma PPi is maintained for at least about 4 hours, preferably, at least about 6 hours, at least about 8 hours, at least about 10 hours or at least about 12 hours.
  • the tissue calcification can be vascular calcification, such as venous or arterial calcification, and the calcification can be intimal or medial.
  • the subject in need of therapy may have NPP1 deficiency, chronic kidney disease (CKD), end-stage renal disease (ESRD), generalized arterial calcification of infancy (GACI), cardiovascular disorder, diabetes mellitus II, atherosclerosis or pseudoxanthoma elasticum (PXE).
  • CKD chronic kidney disease
  • ESRD end-stage renal disease
  • GACI generalized arterial calcification of infancy
  • cardiovascular disorder diabetes mellitus II
  • atherosclerosis or pseudoxanthoma elasticum PXE
  • the pretreatment levels of plasma pyrophosphate (PPi) in the subject is at least about 40% lower than that of the normal plasma PPi levels and the subject is human.
  • the pretreatment levels of Pi in the subject are typically at least about 110% of the normal plasma Pi levels.
  • the amount of sNPP1 administered in each dose can be about 1.0 mg/kg to about 5.0 mg/kg NPP1 or about 1.0 mg/kg to about 10.0 mg/kg NPP1.
  • the time period between doses of NPP1 is at least 2 days and can be longer, for example at least 3 days, at least 1 week, 2 weeks or 1 month.
  • the sNPP1 can be administered in any suitable way, such as intravenously, subcutaneously, or intraperitoneally.
  • a NPP1 fusion protein is administered.
  • Preferred fusion proteins comprise and NPP1 component an Fc region of an immunoglobulin and optionally a targeting moiety.
  • a preferred targeting moiety is Asp 10 .
  • Particularly preferred NPP1 fusion proteins for administration in accordance with the methods disclosed herein have the amino acid sequence of SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:9, SEQ ID NO:10, SEQ ID NO:11 or SEQ ID NO:12.
  • FIG. 1 is the amino acid sequence of wild-type NPP1 protein (SEQ ID NO:1). The cytosolic and transmembrane regions are underlined. The potential N-glycosylation sites are in bold. The amino acid motif “PSCAKE” (SEQ ID NO:17) in bold is the start of a soluble NPP1 which includes the cysteine rich region.
  • FIG. 2 is the amino acid sequence of a sNPP1 that contains the cysteine-rich region, catalytic region and c-terminal region (SEQ ID NO:2).
  • FIG. 3 is the amino acid sequence of sNPP1-Fc fusion protein (SEQ ID NO:3).
  • FIG. 4 is the amino acid sequence of sNPP1-Fc-D10 (SEQ ID NO:4).
  • the Fc sequence is underlined.
  • the D10 (SEQ ID NO:18) targeting moiety is in bold.
  • FIG. 5 illustrates pyrophosphate levels in blood in wild-type mice after administration of sNPP1-Fc or sNPP1-FcD10 intravenously (1 hour post injection) and subcutaneously (4 hour post injection).
  • FIG. 6 illustrates prevention of aortic calcification in Enpp1( ⁇ / ⁇ ) mice with sNPP1-Fc-D10 treatment.
  • Enpp1 ( ⁇ / ⁇ ) mice were treated subcutaneously with vehicle or 6 mg/kg sNPP1-Fc-D10 every other day over a period of 21 days.
  • Aortic calcium levels are shown for males and females.
  • FIG. 7 illustrates blood PPi and enzymatic activity levels in Enpp1( ⁇ / ⁇ ) mice treated with 6 mg/kg sNPP1-Fc-D10 intravenously.
  • Plasma at time points of 0, 4, 24, 48, and 72 hours were collected and analyzed for NPP1 activity (dashed) and PPi levels (solid).
  • the wild-type PPi level was determined to be 2.18 ⁇ M (data not shown).
  • the profiles for sNPP1-Fc were similar to those of sNPP1-Fc-D10.
  • FIG. 8 illustrates increased survival of Enpp1 asj homozygous male mice treated with 5 mg/kg sNPP1-Fc in comparison to vehicle treated mice.
  • Wild-type and Enpp1 asj mice were placed on a high phosphorus, low magnesium diet starting at birth.
  • Vehicle or sNPP1-Fc (5 mg/kg) was dose subcutaneously every other day starting at 14 days of age.
  • Kaplan-Meier survival curves showed that >50% of asj mice died prior to 6 weeks, and all animals died by 9 weeks. In comparison, 50% of sNPP1-Fc treated animals survived past 7 week and are still living at 9 weeks.
  • FIGS. 9 A and 9 B illustrate increased percent body weight gain of Enpp1 asj male mice treated with 5 mg/kg sNPP1-Fc ( FIG. 9 B ) in comparison to vehicle treated mice ( FIG. 9 A ).
  • Wild-type and Enpp1 asj mice were placed on a high phosphorus, low magnesium diet starting at birth. Vehicle or sNPP1-Fc (5 mg/kg) was injected subcutaneously every other day starting at 14 days of age.
  • Percent body weight gain for wild-type (solid line) and Enpp1 asj (circles) mice were plotted from two to nine weeks of age. All Enpp1 asj animals were dead (open circle) in the vehicle group at nine weeks (upper panel). In comparison, five Enpp1 asj mice were alive (solid circle) and five were dead (open circle) in the sNPP1-Fc treatment group at the end of nine weeks.
  • FIGS. 10 A- 10 C are photographs of wild-type ( FIG. 10 A , top), vehicle treated Enpp1 asj ( FIG. 10 B , middle) sNPP1-Fc treated (5 mg/Kg) treated Enpp1 asj ( FIG. 10 C , bottom) mice.
  • FIG. 11 illustrates levels of fibroblast growth factor 23 in vehicle treated wild-type, vehicle treated Enpp1 asj/asj , and sNPP1-Fc treated (5 mg/Kg) Enpp1 asj/asj mice.
  • FIGS. 12 A- 12 H are the amino acid sequences of soluble NPP1 compounds, fusion partners and fusion proteins.
  • FIG. 12 A shows the amino acid sequences of a soluble NPP1 containing amino acids from 107 to 925 of SEQ ID NO:1 (SEQ ID NO:5).
  • FIG. 12 B shows the amino acid sequence of a soluble NPP1 containing amino acids from 187 to 925 of SEQ ID NO:1 (SEQ ID NO:6).
  • FIG. 12 C shows the amino acid sequence of the Fc region of human IgG1 including the hinge region (SEQ ID NO:7).
  • FIG. 12 D shows the amino acid sequence of the Fc of human IgG1 including a partial hinge region (SEQ ID NO:8).
  • FIG. 12 A shows the amino acid sequences of a soluble NPP1 containing amino acids from 107 to 925 of SEQ ID NO:1 (SEQ ID NO:5).
  • FIG. 12 B shows the amino acid sequence of a soluble NPP1 containing
  • FIG. 12 E shows the amino acid sequence of a NPP1-Fc fusion protein (SEQ ID NO:9).
  • the NPP1 component contains SEQ ID NO:5, and the Fc sequence includes the hinge region.
  • FIG. 12 F shows the amino acid sequence of a NPP1-Fc fusion protein (SEQ ID NO:10).
  • the soluble NPP1 contains SEQ ID NO:5, and the Fc sequence includes the partial hinge region.
  • FIG. 12 G shows the amino acid sequence of a NPP1-Fc fusion protein (SEQ ID NO:11).
  • the soluble NPP1 contains SEQ ID NO:6, and the Fc sequence includes the hinge region.
  • FIG. 12 H shows the amino acid sequence of a NPP1-Fc fusion protein (SEQ ID NO:12).
  • the soluble NPP1 contains SEQ ID NO:6, and the Fc sequence includes the partial hinge region.
  • FIGS. 13 A- 13 C are autoradiogram of thin-layer chromatograms which illustrates the activity of recombinant NPP1 in vitro and in vivo.
  • FIG. 13 A 100 nM ATP incubated with 130 ug/ml sNPP1-Fc-D10 for one hour at 37° C.
  • FIG. 13 B 100 nM ATP incubated with plasma from wild-type mice (WT), Enpp1 ⁇ / ⁇ mice, and Enpp1 ⁇ / ⁇ mice 2 hours after IV injection of recombinant NPP1 (6 mg/kg).
  • WT wild-type mice
  • Enpp1 ⁇ / ⁇ mice Enpp1 ⁇ / ⁇ mice
  • FIGS. 14 A and 14 B are histograms which illustrates the time course of plasma NPP1 activity ( FIG. 14 A , top) and plasma pyrophosphate concentration ( FIG. 14 B , bottom) in Enpp1( ⁇ / ⁇ ) mice after subcutaneous injection of recombinant NPP1 (5 mg/kg).
  • FIG. 15 is a scatter-plot which illustrates the relationship between plasma NPP1 activity and plasma pyrophosphate (PPi) for Enpp1( ⁇ / ⁇ ) mice at various times after subcutaneous injection of recombinant NPP1 (5 mg/kg) (circles) and for wild-type mice (squares).
  • PPi plasma pyrophosphate
  • FIGS. 16 A- 16 C are histograms which illustrates the synthesis of pyrophosphate in human blood.
  • FIG. 16 A Heparinized blood or plasma obtained from the same blood sample.
  • FIG. 16 B Centrifuged blood cells with (all cells) or without buffy coat (erythrocytes) removed, suspended in HEPES-buffered saline.
  • FIG. 16 C Isolated leukocytes or platelets, suspended in HEPES-buffered saline. Samples were incubated at 37° C. for 2 hours with or without recombinant NPP1 (145 ug/ml).
  • FIG. 17 is a histogram which illustrates the effect of recombinant NPP1 on aortic calcification in Enpp1( ⁇ / ⁇ ) mice.
  • Recombinant NPP1 was injected (6 mg/kg) subcutaneously every 48 hours in mice fed with a high phosphate diet. Each bar represents a single animal with age in weeks given underneath.
  • M male pair
  • F female pair.
  • Dashed line indicates the mean calcium content of aortas from wild-type littermates.
  • FIG. 18 is a histogram which illustrates the effect of recombinant NPP1 on aortic calcification in uremic rats with renal failure.
  • sNPP1-Fc-D10 or control was injected (5 mg/kg) subcutaneously, 5 dose per week for 21 days in uremic rats fed with a high adenine diet.
  • Each bar represents a single animal aged approximately 4 months.
  • “About” as used herein when referring to a measurable value such as an amount, a temporal duration, and the like, is meant to encompass variations of ⁇ 20% or ⁇ 10%, more preferably ⁇ 5%, even more preferably ⁇ 1%, and still more preferably ⁇ 0.1% from the specified value, as such variations are appropriate to perform the disclosed methods.
  • altered PPi:Pi ratio refers to a ratio of PPi in plasma to Pi in serum that is at least 10% or at least 20% higher or lower than a normal PPi:Pi ratio for that type of subject (e.g. a human).
  • An altered PPi:Pi ratio can be present because of lower than normal levels of plasma PPi or higher than normal levels of serum Pi.
  • the ratio of PPi:Pi is expressed as ([PPi]/[Pi])*1000, and the normal ratio of a human is about 1.75.
  • fragment refers to a subsequence of the full-length NPP1.
  • a “fragment” of a protein or peptide can be at least about 20 amino acids in length; for example, at least about 50 amino acids in length; at least about 100 amino acids in length; at least about 200 amino acids in length; at least about 300 amino acids in length; or at least about 400 amino acids in length (and any integer value in between).
  • the fragments may range in size from four amino acid residues to the entire amino acid sequence minus one amino acid.
  • a protein “comprising at least a portion of the amino acid sequence of SEQ ID NO: 1” encompasses the full-length NPP1 and fragments thereof.
  • high serum Pi refers to a level of inorganic phosphate (Pi) in the serum of a subject that is at least 110% of the normal level of Pi for that type of subject (e.g. a human).
  • the level of Pi in the serum of the subject at least about 120%, at least about 150%, at least about 200% or at least about 300% of the normal level of Pi for that type of subject.
  • Normal Pi levels for a human are reported to be 1.5 ⁇ 0.5 millimolar (Rutsch, F. et al., Circ Cardiovasc Genet 1:133-140 (2008)).
  • an “isolated” or “purified” soluble NPP1 protein or biologically active fragment or fusion protein thereof is substantially free of cellular material or other contaminating proteins from the cell or tissue source from which the NPP1 protein, biologically active fragment or NPP1 fusion protein is derived, or substantially free from chemical precursors or other chemicals when chemically synthesized.
  • the language “substantially free of cellular material” includes preparations of NPP1 protein, biologically active fragment, or NPP1 fusion protein in which the protein is separated from cellular components of the cells from which it is isolated or recombinantly produced.
  • the language “substantially free of cellular material” includes preparations of NPP1 protein, biologically active fragment or NPP1 fusion protein having less than about 30% (by dry weight) of non-NPP1 protein/fragment/fusion protein (also referred to herein as a “contaminating protein”), more preferably less than about 20% of non-NPP1 protein/fragment/fusion protein, still more preferably less than about 10% of non-NPP1 protein/fragment/fusion protein, and most preferably less than about 5% non-NPP1 protein/fragment/fusion protein.
  • non-NPP1 protein/fragment/fusion protein also referred to herein as a “contaminating protein”
  • NPP1 protein, fusion protein, or biologically active fragment thereof is recombinantly produced, it is also preferably substantially free of culture medium, i.e., culture medium represents less than about 20%, more preferably less than about 10%, and most preferably less than about 5% of the volume of the protein preparation.
  • low plasma PPi refers to a level of pyrophosphate (PPi) in the plasma of a subject that is no more than 50% of the normal level of PPi for that type of subject (e.g. a human).
  • the level of PPi in the plasma of the subject no more than about 40%, about 30%, about 20% or about 10% of the normal level of PPi for that type of subject.
  • Normal PPi levels for a human are reported to be 2.63 ⁇ 0.47 microMolar. (O'Neill et al., Nephrol Dial Transplant 2010, 25, 187-191).
  • Pyrophosphate can be quantified enzymatically using suitable known methods, such as the uridine-diphosphoglucose (UDPG) method. (Ryan, L. M. et al., Arthritis Rheum 1979, 22, 886-91).
  • ranges throughout this disclosure, various aspects of the invention can be presented in a range format. It should be understood that the description in range format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the invention. Accordingly, the description of a range should be considered to have specifically disclosed all the possible subranges as well as individual numerical values within that range. For example, description of a range such as from 1 to 6 should be considered to have specifically disclosed subranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6 etc., as well as individual numbers within that range, for example, 1, 2, 2.7, 3, 4, 5, 5.3, and 6. This applies regardless of the breadth of the range.
  • the term “subject” encompasses mammals and non-mammals.
  • mammals include, but are not limited to, humans, chimpanzees, apes monkeys, cattle, horses, sheep, goats, swine, rabbits, dogs, cats, rats, mice, guinea pigs, and the like.
  • non-mammals include, but are not limited to, birds, fish and the like.
  • the term “therapeutically effective amount” refers to a nontoxic but sufficient amount of an agent (e.g. sNPP1 proteins) which, as compared to a corresponding subject who has not received such amount, results in improved treatment, healing, prevention, or amelioration of a disease, disorder, or side effect, or a decrease in the rate of advancement of a disease or disorder.
  • an agent e.g. sNPP1 proteins
  • the term also includes within its scope amounts effective to enhance normal physiological function.
  • treating includes the application or administration of the NPP1 proteins, fragments and fusion proteins of the invention to a subject, or application or administration of NPP1 proteins, fragments and fusion proteins of the invention to a subject who has an NPP1-associated disease or disorder or other disease or disorder associated with low levels of blood pyrophosphate, or other progressive disorder that is characterized by the accumulation of deposits of calcium and other minerals (mineralization), with the purpose of curing, healing, alleviating, relieving, altering, remedying, ameliorating, preventing, improving, or affecting the disease or disorder.
  • treating refers to any indicia of success in the treatment or amelioration of an injury, pathology or condition, including any objective or subjective parameter such as abatement; remission; diminishing of symptoms or making the injury, pathology or condition more tolerable to the subject; slowing in the rate of degeneration or decline; making the final point of degeneration less debilitating; or improving a subject's physical or mental well-being.
  • Treatment may be therapeutic or prophylactic.
  • the treatment or amelioration of symptoms can be based on objective or subjective parameters; including the results of a physical examination.
  • the present invention relates to uses of an isolated recombinant human soluble NPP1 (“sNPP1”) which lacks an N-terminal portion (i.e., lacking cytosolic and transmembrane domains) and fusion proteins thereof for the treatment of NPP1-associated diseases and disorders.
  • the proteins of the invention can be surprisingly used to increase NPP1 activity in vivo and increase or restore normal level of blood pyrophosphate (PPi) in subjects.
  • the proteins of the invention can be also used to prevent accumulation of deposits of calcium in joints, kidney, heart (e.g., aorta), artery, blood vessels, or posterior longitudinal ligament of the spine.
  • the subject can be a human patient having deficiencies in NPP1 activity (NPP1 deficiency) exhibiting low levels of pyrophosphate, suffering from a disease or disorder associated with low levels of pyrophosphate, or suffering from a progressive disorder that is characterized by the accumulation of deposits of calcium and other minerals (mineralization) in elastic fibers. Mineralization can occur at the heart, arteries, blood vessels, the kidney, the ligaments of spine, the skin, eyes, and the digestive tract.
  • NPP1 deficiency exhibiting low levels of pyrophosphate
  • a disease or disorder associated with low levels of pyrophosphate suffering from a progressive disorder that is characterized by the accumulation of deposits of calcium and other minerals (mineralization) in elastic fibers.
  • Mineralization can occur at the heart, arteries, blood vessels, the kidney, the ligaments of spine, the skin, eyes, and the digestive tract.
  • NPP1 proteins and NPP1 fusion proteins of the invention can be used to treat subjects having NPP1-associated diseases or disorders, including but not limited to, idiopathic infantile arterial calcification (IIAC), insulin resistance, hypophosphatemic rickets, and ossification of the posterior longitudinal ligament of the spine, or other diseases such as vascular calcification in chronic kidney disease (VCCKD), myocardial ischemia, joint calcification, angioid streaks, and pseudoxanthoma elasticum (PXE).
  • IIAC idiopathic infantile arterial calcification
  • IIAC insulin resistance
  • hypophosphatemic rickets ossification of the posterior longitudinal ligament of the spine
  • other diseases such as vascular calcification in chronic kidney disease (VCCKD), myocardial ischemia, joint calcification, angioid streaks, and pseudoxanthoma elasticum (PXE).
  • VCKD chronic kidney disease
  • PXE pseudoxanthoma elasticum
  • the soluble NPP1 proteins, fragment, and NPP1 fusion proteins thereof can be used to treat a wide variety of conditions in a subject.
  • treatment of conditions that can be improved by reducing and/or eliminating one or more calcification structures and/or preventing calcification structures from forming in a subject such as a mammal, for example, a human patient is within the scope of the invention.
  • the condition to be treated is generalized arterial calcification (also known as idiopathic arterial calcification of infancy and arterial media calcification of infancy).
  • generalized arterial calcification also known as idiopathic arterial calcification of infancy and arterial media calcification of infancy.
  • conditions such as pseudoxanthoma elasticum, vascular calcification in chronic kidney disease, insulin resistance, hypophosphatemic rickets, or ossification of the posterior longitudinal ligament of the spine can be also treated using the methods described herein.
  • the dosage of fusion protein administered to a subject will vary depending upon known factors such as age, health and weight of the recipient, type of concurrent treatment, frequency of treatment, and the like.
  • a dosage of active ingredient i.e., fusion protein
  • fusion protein can be between about 0.0001 and about 50 milligrams per kilogram of body weight.
  • Precise dosage, frequency of administration and time span of treatment can be determined by a physician skilled in the art of administration of therapeutic proteins.
  • a preferred embodiment of the present invention involves a method for treatment of an NPP1-associated disease or other calcification diseases which includes the step of administering a therapeutically effective amount of an isolated soluble NPP1 protein (sNPP1), biologically active fragment, or NPP1 fusion protein to a subject.
  • a therapeutically effective amount of protein i.e., an effective dosage
  • treatment of a subject with a therapeutically effective amount of protein can include a single treatment or, preferably, can include a series of treatments. It will also be appreciated that the effective dosage of protein used for treatment may increase or decrease over the course of a particular treatment.
  • a therapeutically effective amount of protein or polypeptide ranges from about 0.001 to 50 mg/kg body weight, preferably about 0.01 to 25 mg/kg body weight, more preferably about 0.1 to 20 mg/kg body weight, and even more preferably about 1 to 10 mg/kg, 2 to 9 mg/kg, 3 to 8 mg/kg, 4 to 7 mg/kg, or 5 to 6 mg/kg body weight.
  • an effective dosage ranges from about 0.001 to 50 mg/kg body weight, preferably about 0.01 to 25 mg/kg body weight, more preferably about 0.1 to 20 mg/kg body weight, and even more preferably about 1 to 10 mg/kg, 2 to 9 mg/kg, 3 to 8 mg/kg, 4 to 7 mg/kg, or 5 to 6 mg/kg body weight.
  • treatment of a subject with a therapeutically effective amount of a protein, polypeptide, or antibody can include a single treatment or, preferably, can include a series of treatments.
  • soluble sNPP1 protein, biologically active fragment or fusion protein thereof used for the treatment may increase or decrease over the course of a particular treatment.
  • the invention provides for a therapeutically effective dose of sNPP1, biologically active fragment or fusion protein thereof to be administered to a patient between one time every 5 days and one time every 30 days for a period of time determined by a practitioner of skill in the art of medical sciences.
  • the period of time will be the remainder of the patient's life span.
  • the dosing frequency is between one time every 5 days and one time every 25 days. In one embodiment, the dosing frequency is between one time every 5 days and one time every 21 days. In another embodiment, the dosing frequency is between one time every 7 days and one time every 14 days.
  • sNPP1, biologically active fragment or fusion protein thereof can be administered one time every 5 days, one time every 6 days, one time every 7 days, one time every 8 days, one time every 9 days, one time every 10 days, one time every 11 days, one time every 12 days, one time every 13 days, or one time every 14 days.
  • sNPP1, biologically active fragment or fusion protein thereof is administered about weekly.
  • sNPP1, biologically active fragment or fusion protein thereof is administered about bi-weekly.
  • the dosing frequency is one time about 30 days.
  • the patient is less than 2 years of age. In some embodiments, about 0.1 mg, about 0.2 mg, about 0.3 mg, about 0.4 mg, about 0.5 mg, about 1 mg, about 2 mg, about 3 mg, about 5 mg, about 10 mg, about 15 mg, about 20 mg, about 25 mg, about 30 mg, about 35 mg, about 40 mg, or about 45 mg of sNPP1, biologically active fragment or fusion protein is administered to the patient with NPP1-deficiency or other calcification disease. In some embodiments, about 0.5 to about 30 mg, about 0.5 to about 20 mg, about 0.5 to about 10 mg, or about 0.5 to about 5 mg are administered to the patient.
  • about 1 mg/kg of sNPP1, biologically active fragment or fusion protein is administered to the patient once a week. In one embodiment, about 2 mg/kg of sNPP1, biologically active fragment or fusion protein is administered to the patient once a week. In one embodiment, about 3 mg/kg of sNPP1, biologically active fragment or fusion protein is administered to the patient once a week. In one embodiment, about 4 mg/kg of sNPP1, biologically active fragment or fusion protein is administered to the patient once a week. In one embodiment, about 5 mg/kg of sNPP1, biologically active fragment or fusion protein is administered to the patient once a week.
  • about 6 mg/kg of sNPP1, biologically active fragment or fusion protein is administered to the patient once a week. In one embodiment, about 7 mg/kg of sNPP1, biologically active fragment or fusion protein is administered to the patient once a week. In one embodiment, about 8 mg/kg of sNPP1, biologically active fragment or fusion protein is administered to the patient once a week. In one embodiment, about 9 mg/kg of sNPP1, biologically active fragment or fusion protein is administered to the patient once a week. In one embodiment, about 10 mg/kg of sNPP1, biologically active fragment or fusion protein is administered to the patient once a week.
  • the level of blood PPi in a patient prior to treatment is about 1%, about 2%, about 3%, about 5%, about 10%, about 15%, about 20%, about 30%, about 40%, about 50%, about 60%, about 70%, or about 80% of normal levels of PPi observed in a normal human individual. In one embodiment, the level of PPi in a patient prior to treatment is about 50% or less of normal levels of PPi observed in a normal human individual. In one embodiment, the level of PPi in a patient prior to treatment is about 40% or less of normal levels of PPi observed in a normal human individual. In some embodiments, the level of PPi in a patient prior to treatment is about 30% or less of normal levels of PPi observed in a normal human individual.
  • the level of PPi in a patient prior to treatment is about 30% or less of normal levels PPi observed in a normal human individual. In some embodiments, the level of PPi in a patient prior to treatment is about 20% or less of normal levels of PPi observed in a normal human individual. In some embodiments, the level of PPi in a patient prior to treatment is about 10% or less of normal levels of PPi observed in a normal human individual. In some embodiments, the level of PPi in a patient prior to treatment is about 5% or less of normal levels of PPi observed in a normal human individual. In some embodiments, a patient shows no measurable PPi prior to treatment.
  • sNPP1 biologically active fragment or fusion protein
  • biologically active fragment or fusion protein can be administered by, for example, subcutaneous injections, intramuscular injections, and intravenous (IV) infusions or injections.
  • IV intravenous
  • sNPP1 biologically active fragment or fusion protein is administered intravenously by IV infusion by any useful method.
  • sNPP1 biologically active fragment or fusion protein can be administered by intravenous infusion through a peripheral line.
  • sNPP1, biologically active fragment or fusion protein can be administered by intravenous infusion through a peripherally inserted central catheter.
  • sNPP1 biologically active fragment or fusion protein is administered intravenously by IV injection.
  • sNPP1 biologically active fragment or fusion protein
  • sNPP1 biologically active fragment or fusion protein
  • sNPP1 biologically active fragment or fusion protein
  • sNPP1 biologically active fragment or fusion protein
  • sNPP1 biologically active fragment or fusion protein
  • sNPP1 biologically active fragment or fusion protein
  • sNPP1 biologically active fragment or fusion protein is administered via a pharmaceutically acceptable capsule of the therapeutic protein.
  • the capsule can be an enteric-coated gelatin capsule.
  • the method involves administering the soluble NPP1 protein or NPP1 fusion protein of the invention alone, or in combination with other agent(s). In one embodiment, the method involves administering an NPP1 protein or an NPP1 fusion protein of the invention as therapy to compensate for reduced or aberrant NPP1 expression or activity in the subject having an NPP1-deficiency or other associated disease or disorder.
  • the isolated sNPP1 proteins, fragments, and fusion proteins can be administered before, after or concurrently with the agent or can be co-administered with other known therapies.
  • Co-administration of the isolated sNPP1 proteins, fragments, and fusion proteins of the present invention with other therapeutic agents may provide two agents which operate via different mechanisms which yield an increased therapeutic effect. Such co-administration can solve problems due to development of resistance to drugs.
  • this disclosure relates to a method for reducing vascular calcification in a subject in need thereof.
  • the method is based on the surprising finding that soluble forms of NPP1 can be administered to animals that have low plasma PPi levels (an inhibitor or tissue calcification) or high serum Pi levels, to cause a transient increase in plasma PPi in the animals, and that the transient increase in plasma PPi can inhibit vascular calcification in the animal. Since the increase in plasma PPi is transient, therapy can be tailored to inhibit undesirable or pathological tissue calcification, such as vascular calcification, without inhibiting bone calcification or inducing osteomalacia.
  • the disclosure relates to a method for reducing tissue calcification (e.g., vascular calcification) in a subject in need thereof, by administering to the subject two or more doses of soluble NPP1 (sNPP1).
  • sNPP1 soluble NPP1
  • Each of the doses contains an amount of soluble NPP1 that is sufficient to achieve a transient increase in plasma PPi in the subject, preferably with a return to base-line PPi level within about 48 hours after administration of the dose.
  • the time period between the administration of each dose is generally at least 2 days.
  • the subject in need thereof can be of any age and gender, and preferably has low plasma PPi or high serum Pi (e.g., resulting in an altered PPi:Pi ratio).
  • Low plasma PPi can be due, for example, to congenital NPP1 deficiency such as mutation in the gene encoding NPP1 that lead to reduced expression of active NPP1 or reduced enzymatic activity (associated with NPP1 deficiency and autosomal-recessive hypophosphatemic rickets), and mutation in the gene encoding MRP6 that lead to absent or nonfunctional MRP6 protein (associated with pseudoxanthoma elasticum).
  • CKD chronic kidney disease
  • ESRD end-stage renal disease
  • GACI generalized arterial calcification of infancy
  • diabetes mellitus II autosomal-recessive hypophosphatemic rickets
  • cardiovascular disorder atherosclerosis and/or pseudoxanthoma elasticum (PXE).
  • PXE pseudoxanthoma elasticum
  • the subject is generally a human, but can also be any other suitable mammal or non-mammal.
  • Tissue calcification is a progressive process and individuals born with congenital NPP1 deficiency may not show calcification of tissues for several years. By initiating therapy as early as possible, it is likely that calcification can be reduced and or minimized in such subjects.
  • therapy should begin as soon as practicable (i.e., soon after the diagnosis of the conditions, such as chronic kidney disease (CKD) or end-stage renal disease (ESRD)).
  • CKD chronic kidney disease
  • ESRD end-stage renal disease
  • the subject to be treated can be between 1 month and 24 months in age, less than 1 year of age, less than 2 years of age, less than 3 years of age, less than 4 years of age, or less than 5 years of age.
  • each dose of sNPP1 that is administered to the subject contains an amount of sNPP1 sufficient to achieve a transient increase in plasma PPi.
  • the transient increase is characterized by a peak PPi level that is at least about 40% of the normal plasma PPi level, at least about 50% of the normal plasma PPi level, at least about 60% of the normal plasma PPi level, at least about 70% of the normal plasma PPi level, at least about 80% of the normal plasma PPi level, between about 40% and 100% of the normal plasma PPi level, between about 50% and 100% of the normal plasma PPi level, between about 60% and 100% of the normal plasma PPi level, between about 70% and 100% of the normal plasma PPi level, between about 80% and 100% of the normal plasma PPi level, or between about 100% and 200% of the normal plasma PPi level.
  • the transient increase in plasma PPi after administration of sNPP1 is maintained for at least about 4 hours, at least about 6 hours, at least about 8 hours, at least about 10 hours or at least about 12 hours.
  • the transient increase in plasma PPi returns to the subject's base-line PPi level within about 48 hours after administration of the dose, within about 3 days after administration of the dose or within about 4 days after administration of the dose.
  • the low plasma PPi in a subject prior to treatment is about 50% or less, preferably 40% or less of normal levels of PPi observed in a normal subject (e.g., a human).
  • a normal subject e.g., a human
  • the level of PPi in a subject prior to treatment is about 30% or less of normal levels of PPi.
  • the level of PPi in a subject prior to treatment is about 20% or less of normal levels of PPi.
  • the level of PPi in a subject prior to treatment is about 10% or less of normal levels.
  • a subject may have no measurable PPi prior to treatment.
  • the high serum Pi in a subject prior to treatment is about 110% or more, preferably 125% or more of normal levels of Pi observed in a normal subject (e.g., a human).
  • the level of Pi in a subject prior to treatment is about 150% or more of normal levels of PPi.
  • the level of Pi in a subject prior to treatment is about 200% or more of normal levels of PPi.
  • the level of Pi in a subject prior to treatment is about 300% or more of normal levels.
  • inducing a transient increase in serum PPi can compensate for elevated plasma Pi levels and transiently restore normal or nearly normal PPi:Pi ratio, thereby inhibiting tissue calcification which is promoted by higher than normal levels of serum Pi.
  • the amount of sNPP1 sufficient to achieve the transient increase in plasma PPi can be easily determined by a clinician of ordinary skill, for example, by administering a dose that is expected to produce the transient increase in plasma PPi, determining whether the transient increase occurs and then making appropriate adjustments to the dose.
  • the amount to administer will be influenced by a number of conventional factors, including the particular sNPP1 used, the age, health and weight of the subject, the subject's sensitivity to drugs, and other relevant factors.
  • the amount of sNPP1 to be administered in each dose is between about 0.001 and about 50 milligrams per kilogram of body weight, with 1 mg/kg to 5 mg/kg, 1 mg/kg to 10 mg/kg, 1 mg/kg to 20 mg/kg, 1 mg/kg, 2 mg/kg, 3 mg/kg, 4 mg/kg, 5 mg/kg, 6 mg/kg, 7 mg/kg, 8 mg/kg, 9 mg/kg, 10 mg/kg, 11 mg/kg, 12 mg/kg, 13 mg/kg, 14 mg/kg, 15 mg/kg, 16 mg/kg, 17 mg/kg, 18 mg/kg, 19 mg/kg, or 20 mg/kg being preferred.
  • Precise dosage, frequency of administration and time span of treatment can be determined by a physician skilled in the art of administration of therapeutic proteins.
  • each dose contains about 1.0 mg to about 5.0 mg sNPP1 per Kg body weight, about 1.0 mg to about 10.0 mg sNPP1 per Kg body weight or about 1.0 mg to about 20.0 mg sNPP1 per Kg body weight.
  • the time period between doses is selected to permit the subject's serum PPi levels to return to base-line levels, and is at least 2 (48 hours) days, but can be longer as desired or indicated.
  • the time period between doses can be 3 days, 4 days, 5 days, 6 days, one week, 10 days, 12 days, two weeks, three weeks or about 1 month.
  • NPP1 deficiency In general, it is desirable to initiate the therapy according to the methods described herein as soon as practicable after diagnosis of low plasma PPi, high serum Pi, or NPP1 deficiency. Subjects born with congenital NPP1 deficiency may not show calcification of tissues for several years. By initiating therapy as early as possible, it is likely that calcification can be reduced and or minimized in such subjects. In subjects with low plasma PPi levels not caused by germ line mutation or with high serum Pi, therapy should begin as soon as practicable after the diagnosis of conditions, such as chronic kidney disease (CKD) or end-stage renal disease (ESRD).
  • CKD chronic kidney disease
  • ESRD end-stage renal disease
  • the method provides an effective way to reduce tissue calcification (e.g. vascular calcification) in a subject with low plasma PPi or with high serum Pi, including those with an altered ratio of PPi to Pi.
  • tissue calcification is preferably vascular calcification, which is preferably arterial calcification but can also be venus calcification.
  • the vascular calcification can be intimal or medial.
  • the subject to be treated in accordance with the methods described herein can have NPP1 deficiency, generalized arterial calcification (GACI), also known as idiopathic arterial calcification of infancy and arterial media calcification of infancy.
  • the subject to be treated can also have a cardiovascular disorder, such as coronary artery disease and/or atherosclerosis.
  • the subject to be treated can have chronic kidney disease (CKD) or end-stage renal disease (ESRD).
  • the subject to be treated can have diabetes mellitus (e.g. type II diabetes).
  • the subject to be treated can have pseudoxanthoma elasticum (PXE).
  • the sNPP1 can be administered by any suitable method or route of administration, such as parenterally, orally or by inhalation.
  • Parenteral administration such as, intravenous injection or infusion, subcutaneous injection, intraperitoneal injections, or intramuscular injections is preferred.
  • the sNPP1 can be administered with one or more co-therapeutic agents.
  • the sNPP1 and one or more additional therapeutic agents are administered so that there is substantial overlap in their individual pharmacological activities in the subject. Accordingly, any co-therapeutic agent can be administered prior to, concurrently with or subsequent to the administration of sNPP1.
  • Co-therapy may provide two agents which operate via different mechanisms which yield an increased therapeutic effect.
  • administering sNPP1 in accordance with the methods described herein can alter the levels of certain proteins in the subject.
  • administering sNPP1 in accordance with the methods described herein can decrease the levels of osteopontin, osteoprotegerin and fibroblast growth factor 23 (FGF-23) in the subject.
  • the levels of these proteins can therefor also be used, in addition to plasma PPi and serum Pi levels, to monitor therapy and tailor dosing.
  • the present invention employes soluble NPP1 that a biologically active NPP1 domain of NPP1 (i.e., NPP1 components that contain at least one extracellular catalytic domain of naturally occurring NPP1 for the pyrophosphatase and/or phosphodiesterase activity).
  • the soluble NPP1 proteins of the invention comprise at least the NPP1 domain essential to carry out the pyrophosphatase and/or phosphodiesterase activity.
  • the soluble NPP1, fragment, and fusion proteins thereof can form functional homodimers or monomer.
  • a soluble NPP1 protein or NPP1 fusion protein thereof can be assayed for pyrophosphatase activity as well as the ability to increase pyrophosphate levels in vivo.
  • Preferred soluble NPP1 proteins and NPP1 fusion proteins of the invention are enzymatically active in vivo (e.g., human).
  • the soluble protein comprises amino acid sequence having at least 60, 70, 75, 80, 85, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99% sequence identity to the following sequence:
  • any desired enzymatically active form of soluble NPP1 can be used in the methods described herein.
  • the enzymatically active sNPP1 can increase PPi levels in suitable enzymatic assays, and can be assayed for pyrophosphatase activity, phosphodiesterase activity, or pyrophosphatase and phosphodiesterase activity.
  • the sNPP1 contains at least an NPP1 component that lacks the N-terminal cytosolic and transmembrane domains of naturally occurring transmembrane NPP1.
  • the NPP1 component contains the cysteine-rich region (amino acids 99-204 of SEQ ID NO:1) and the catalytic region (amino acids 205-591 of SEQ ID NO:1) of naturally occurring human NPP1.
  • the NPP1 component also includes the C-terminal region (amino acids 592 to 925 of SEQ ID NO:1), and has the amino acid sequence of SEQ ID NO:2.
  • the C-terminal region can be truncated if desired.
  • preferred NPP1 components include the cysteine-rich region and catalytic region of human NPP1 (amino acids 99-591 of SEQ ID NO:1) or the cysteine-rich region, the catalytic region and the C-terminal region of human NPP1 (SEQ ID NO:2).
  • Other preferred NPP1 components contain only a portion of the cysteine-rich domain and have the sequence of amino acids 107 to 925 of SEQ ID NO:1 or amino acids 187 to 925 of SEQ ID NO:1.
  • the cysteine rich region of NPP1 (i.e., amino acids 99 to 204 of SEQ ID NO: 1) can facilitate dimerization of the sNPP1.
  • the sNPP1, including fusion proteins, can be in the form of a monomer of functional homodimer.
  • the amino acid sequence of the NPP1 component can be a variant of the naturally occurring NPP1 sequence, provided that the NPP1 component is enzymatically active.
  • NPP1 variants are enzymatically active and have at least 80%, at least 85%, at least 90%, at least 95% and more preferably at least 96% amino acid sequence identity to the corresponding portion of human NPP1 (e.g., over the length of the cysteine-rich region, the catalytic region, the c-terminal region, the cysteine-rich region plus the catalytic region, the cystein-rich region plus the catalytic region plus the c-terminal region.
  • Preferred NPP1 variants have at least 90%, preferably at least 95%, more preferably at least 97% amino acid sequence identity to (i) the amino acid sequence of residues 205-591 of SEQ ID NO: 1, (ii) the amino acid sequence of residues 99-591 of SEQ ID NO:1, (iii) the amino acid sequence of residues 99-925 of SEQ ID NO:1, (iv) the amino acid sequence of residues 107-925 of SEQ ID NO:1, or (v) the amino acid sequence of residues 187-925 of SEQ ID NO:1.
  • Suitable positions for amino acid variation are well-known from NPP1 structural studies and analysis of disease-associated mutations in NPP1.
  • substitution of the following amino acids occurs in certain disease-associated mutations that reduce NPP1 enzymatic activity, and variations of the amino acids at these positions should be avoided: Ser216, Gly242, Pro250, Gly266, Pro305, Arg349, Tyr371, Arg456, Tyr471, His500, Ser504, Tyr513, Asp538, Tyr570, Lys579, Gly586; Tyr659, Glu668, Cys726, Arg774, His777, Asn792, Asp804, Arg821, Arg888, and Tyr901. (See, e.g., Jansen, S. et al., Structure 20:1948-1959 (2012).)
  • the soluble NPP1 protein can be a fusion protein recombinantly fused or chemically bonded (e.g., covalent bond, ionic bond, hydrophobic bond and Van der Waals force) to a fusion partner.
  • the fusion protein has at least 70, 75, 80, 85, 90, 91, 92, 93, 94, 95, 96, 97, 98, or 99% sequence identity to SEQ ID NO:3 or SEQ ID NO:4.
  • the sequences are aligned for optimal comparison purposes (e.g., gaps can be introduced in one or both of a first and a second amino acid or nucleic acid sequence for optimal alignment and non-homologous sequences can be disregarded for comparison purposes).
  • the length of a reference sequence aligned for comparison purposes is at least 30%, preferably at least 40%, more preferably at least 50%, even more preferably at least 60%, and even more preferably at least 70%, 80%, or 90% of the length of the reference sequence (e.g., sNPP1 amino acid sequence of SEQ ID NO:2; amino acids 107-925 of SEQ ID NO:1 or amino acids 187-925 of SEQ ID NO:1).
  • amino acid residues or nucleotides at corresponding amino acid positions are then compared.
  • a position in the first sequence is occupied by the same amino acid residue or nucleotide as the corresponding position in the second sequence, then the molecules are identical at that position (as used herein amino acid is equivalent to amino acid or nucleic acid “homology”).
  • amino acid is equivalent to amino acid or nucleic acid “homology”.
  • the percent identity between the two sequences is a function of the number of identical positions shared by the sequences, taking into account the number of gaps, and the length of each gap, which need to be introduced for optimal alignment of the two sequences.
  • the comparison of sequences and determination of percent identity between two sequences can be accomplished using a mathematical algorithm.
  • the percent identity between two amino acid sequences is determined using the Needleman and Wunsch (J Mol Biol 1970, 48, 444-453) algorithm which has been incorporated into the GAP program in the GCG software package (available at www.gcg.com), using either a Blosum 62 matrix or a PAM250 matrix, and a gap weight of 16, 14, 12, 10, 8, 6, or 4 and a length weight of 1, 2, 3, 4, 5, or 6.
  • the percent identity between two amino acid is determined using the algorithm of E. Meyers and W. Miller (CABIOS, 1989, 4, 11-17) which has been incorporated into the ALIGN program (version 2.0 or 2.0U), using a PAM120 weight residue table, a gap length penalty of 12 and a gap penalty of 4.
  • the sNPP1 can consist of or consist essentially of an NPP1 component as described herein.
  • the sNPP1 can be in the form of a fusion protein that contains an NPP1 component and one or more other polypeptides, referred to as fusion partners, optionally through a suitable linker in each instance, or in the form of a conjugate between an NPP1 component and another molecule (e.g., PEG).
  • fusion partners optionally through a suitable linker in each instance
  • another molecule e.g., PEG
  • each fusion partner is preferably located c-terminally to the NPP1 component.
  • fusion proteins that contain an NPP1 component that contains the cysteine-rich region and catalytic region, and one or more fusion proteins that are located c-terminally to the NPP1 component, are preferred over other configurations of NPP1 fusion proteins because they can be expressed at sufficient levels and are sufficiently stable to be used as therapeutic proteins.
  • Any suitable fusion partner can be included in the fusion protein.
  • a number of fusion partners are well-known in the art that can provide certain advantages, such as reduced aggregation and immunogenicity, increased the solubility, improved expression and/or stability, and improved pharmacokinetic and/or pharmacodynamics performance. See, e.g., Strohl, W. R. BioDrugs 29:215-239 (2015).
  • albumin, albumin fragments or albumin variants e.g., human serum albumin and fragments or variants thereof
  • albumin, albumin fragments or albumin variants can be incorporated into fusion proteins and that such fusion proteins can be easily purified, stable and have an improved plasma half-life.
  • Suitable albumin, albumin fragments and albumin variants that can be used in the sNPP1 fusion proteins are disclosed, for example in WO 2005/077042A2 and WO 03/076567A2, each of which is incorporated herein by reference in its entirety. Fusions to human transferrin are also known to improve half-life. See, e.g., Kim B J et al., J Pharmacol Expr Ther 334(3):682-692 (2010); and WO 2000/020746. Peptides that bind to albumin or transferrin, such as antibodies or antibody fragments, can also be used. See, e.g., EP 0486525 B1, U.S. Pat. No.
  • the fusion protein can also include a CTP sequence (see also, Fares et al., Endocrinol 2010, 151, 4410-4417; Fares et al., Proc Natl Acad Sci 1992, 89, 4304-4308; and Furuhashi et al., Mol Endocrinol 1995, 9, 54-63).
  • the fusion partner is the Fc of an immunoglobulin (e.g., Fc or human IgG1).
  • the Fc can include CH1, CH2 and CH3 of human IgG1, and optionally the human IgG1 hinge region (EPKSCDKTHTCPPCP (SEQ ID NO:13)) or a portion of the human IgG1 hinge region (e.g., DKTHTCPPCP (SEQ ID NO:14) or PKSCDKTHTCPPCP (SEQ ID NO:15)) if desired.
  • the Fc can include CH2 and CH3 of human IgG1, or the Fc of human IgG2 or human IgG4, if desired.
  • the sNPP1 fusion protein comprises an NPP1 component and a peptide that increases the half-life of the fusion protein, most preferably the Fc of an immunoglobulin (e.g., Fc or human IgG1).
  • a “protein that increases the half-life of the fusion protein” refers to a protein that, when fused to a soluble NPP1 or biologically active fragment, increases the half-life of the soluble NPP1 polypeptide or biologically active fragment as compared to the half-life of the soluble NPP1 polypeptide, alone, or the NPP1 biologically active fragment, alone.
  • the half-life of the NPP1 fusion protein is increased 50% as compared to the half-life of the NPP1 polypeptide or biologically active fragment, alone. In another embodiment, the half-life of the NPP1 fusion protein is increased 60% as compared to the half-life of the NPP1 polypeptide or biologically active fragment, alone. In another embodiment, the half-life of the NPP1 fusion protein is increased 70% as compared to the half-life of the NPP1 polypeptide or biologically active fragment, alone. In another embodiment, the half-life of the NPP1 fusion protein is increased 80% as compared to the half-life of the NPP1 polypeptide or biologically active fragment, alone. In another embodiment, the half-life of the NPP1 fusion protein is increased 90% as compared to the half-life of the NPP1 polypeptide or biologically active fragment, alone.
  • the half-life of the NPP1 fusion protein is increased 2 fold, 3 fold, 4 fold, 5 fold, 6 fold, 7 fold, 8 fold, 9 fold, or 10 fold as compared to the half-life of the NPP1 polypeptide or biologically active fragment, alone.
  • Methods for determining the half-life of a protein or fusion protein are well known in the art. For example, Zhou et al., Determining Protein Half-Lives, Methods in Molecular Biology 2004, 284, 67-77 discloses numerous methods for testing of the half-life of a protein.
  • the fusion protein can be conjugated to polymers or other suitable compounds that extend half-life, such as polyethylene glycol (PEG), can be conjugated to the NPP1 fusion proteins.
  • PEG polyethylene glycol
  • the peptide which increases the half-life of the fusion protein is a CTP sequence (see also, Fares et al., 2010, Endocrinol., 151(9):4410-4417; Fares et al., 1992, Proc. Natl. Acad. Sci, 89(10):4304-4308; and Furuhashi et al., 1995, Molec. Endocrinol., 9(1):54-63).
  • the peptide which increases the half-life of the fusion protein is an Fc domain of an Ig.
  • Fusion partners may also be selected to target the fusion protein to desired sites of clinical or biological importance (e.g., site of calcification).
  • desired sites of clinical or biological importance e.g., site of calcification.
  • peptides that have high affinity to the bone are described in U.S. Pat. No. 7,323,542, the entire teachings of which are incorporated herein by reference.
  • Peptides that can increase protein targeting to calcification sites can contain a consecutive stretch of at least about 4 acidic amino acids, for example, glutamic acids or aspartic acids.
  • the peptide that targets the fusion protein to calcification sites will comprise between 4 and 20 consecutive acidic amino acids, for example 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20 consecutive amino acids selected from glutamic acid and aspartic acid.
  • the peptide can consist solely of glutamic acid residues, solely of aspartic acid residues, or be a mixture of glutamic acid and aspartic acid residues.
  • a particularly preferred moiety for targeting to sights of calcification is Asp 10 (SEQ ID NO:18).
  • the NPP1 fusion protein of the invention comprises an NPP1 polypeptide and a moiety that increase protein targeting to calcification sites such as a consecutive stretch of acidic amino acids, for example, glutamic acids or aspartic acids.
  • Suitable peptide linkers for use in fusion proteins are well-known and typically adopt a flexible extended conformation and do not interfere with the function of the NPP1 component or the fusion partners.
  • Peptide linker sequences may contain Gly, His, Asn and Ser residues in any combination.
  • the useful peptide linkers include, without limitation, poly-Gly, poly-His, poly-Asn, or poly-Ser. Other near neutral amino acids, such as Thr and Ala can be also used in the linker sequence.
  • linkers include those disclosed in Maratea et al., Gene 1985, 40, 39-46; Murphy et al., Proc Natl Acad Sci USA 1986, 83, 8258-8262; U.S. Pat. Nos. 4,935,233 and 4,751,180.
  • Other suitable linkers can be obtained from naturally occurring proteins, such as the hinge region of an immunoglobulin.
  • a preferred synthetic linker is (Gly 4 Ser) n , where n is 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 (SEQ ID NO:19).
  • n is 3 or 4.
  • the linker is (Gly 4 Ser) 3 (SEQ ID NO:16) and the fusion protein include a linker with the amino acid sequence GlyGlyGlyGlySerGlyGlyGlyGlySerGlyGlyGlyGlySer (SEQ ID NO:16).
  • the linker is from 1 to about 50 amino acid residues in length, or 1 to about 25 amino acids in length. Frequently, the linker is between about 8 and about 20 amino acids in length.
  • Preferred NPP1 fusion proteins comprise from N-terminus to C-terminus an NPP1 component, optionally a linker, an Fc region of an immunoglobulin (e.g., human IgG1 Fc optionally including hinge or a portion thereof), optionally a second liner, and optionally a targeting moiety.
  • an Fc region of an immunoglobulin e.g., human IgG1 Fc optionally including hinge or a portion thereof
  • optionally a targeting moiety when present, are each located C-terminally to the NPP1 component.
  • the NPP1 component preferably comprises the cysteine-rich region and the catalytic domain of NPP1, lacks the N-terminal cytosolic and transmembrane domains, and optionally contains the C-terminal region.
  • a preferred fusion protein comprises, from N-terminus to C-terminus, an NPP1 component comprising the cysteine-rich domain, the catalytic domain and the C-terminal region of human NPP1; and the Fc region, including hinge, of a human immunoglobulin.
  • the Fc region is from human IgG1.
  • the fusion protein has at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99% sequence identity to SEQ ID NO:3.
  • a preferred fusion protein of this type has the amino acid sequence of SEQ ID NO:3.
  • Another preferred fusion protein comprises, from N-terminus to C-terminus, an NPP1 component comprising the cysteine-rich domain, the catalytic domain and the C-terminal region of human NPP1; a linker (e.g., (Gly 4 Ser) 3 (SEQ ID NO:16)); and the Fc region, including hinge, of a human immunoglobulin.
  • the Fc region is from human IgG1.
  • Another preferred fusion protein comprises, from N-terminus to C-terminus, an NPP1 component comprising the cysteine-rich domain, the catalytic domain and the c-terminal region of human NPP1; the Fc region, including hinge or a portion thereof, of a human immunoglobulin; and a moiety targeting the fusion protein to sites of calcification.
  • the Fc region is from human IgG1.
  • the moiety targeting the fusion protein to sites of calcification is Asp 10 (SEQ ID NO:18). More preferably, the Fc region is from human IgG1 and the moiety targeting the fusion protein to sites of calcification is Asp 10 (SEQ ID NO:18).
  • the fusion protein has at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99% sequence identity to SEQ ID NO:4.
  • a preferred fusion protein of this type has the amino acid sequence of SEQ ID NO:4.
  • Another preferred fusion protein comprises, from N-terminus to C-terminus, an NPP1 component comprising the cysteine-rich domain, the catalytic domain and the c-terminal region of human NPP1; a linker (e.g., (Gly 4 Ser) 3 (SEQ ID NO:16)); the Fc region, including hinge or a portion thereof, of a human immunoglobulin; and a moiety targeting the fusion protein to sites of calcification.
  • the Fc region is from human IgG1.
  • the moiety targeting the fusion protein to sites of calcification is Asp 10 (SEQ ID NO:18). More preferably, the Fc region is from human IgG1 and the moiety targeting the fusion protein to sites of calcification is Asp 10 (SEQ ID NO:18).
  • Another preferred fusion protein comprises, from N-terminus to C-terminus, an NPP1 component comprising a portion of the cysteine-rich domain, the catalytic domain and the c-terminal region of human NPP1; optionally a linker (e.g., (Gly 4 Ser) 3 (SEQ ID NO:16)); the Fc region, including hinge or a portion thereof, of a human immunoglobulin.
  • the Fc region is from human IgG1.
  • the fusion protein has at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99% sequence identity to SEQ ID NO:9, SEQ ID NO:10, SEQ ID NO:11, or SEQ ID NO:12.
  • Preferred fusion protein of this type have the amino acid sequence of SEQ ID NO:9, SEQ ID NO:10, SEQ ID NO:11 or SEQ ID NO:12.
  • a fusion protein of SEQ ID NO:3 is administered in accordance with the methods described herein.
  • a fusion protein of SEQ ID NO:4 is administered in accordance with in the methods described herein.
  • a fusion protein of SEQ ID NO:9 is administered in accordance with in the methods described herein.
  • a fusion protein of SEQ ID NO:10 is administered in accordance with the methods described herein.
  • a fusion protein of SEQ ID NO:11 is administered in accordance with the methods described herein.
  • a fusion protein of SEQ ID NO:12 is administered in accordance with the methods described herein.
  • Fusion proteins of the present invention can be prepared using standard methods, including recombinant techniques or chemical conjugation well known in the art. Techniques useful for isolating and characterizing the nucleic acids and proteins of the present invention are well known to those of skill in the art and standard molecular biology and biochemical manuals can be consulted to select suitable protocols for use without undue experimentation. See, for example, Sambrook et al., 1989, “Molecular Cloning: A Laboratory Manual”, 2 nd ed., Cold Spring Harbor, the content of which is herein incorporated by reference in its entirety.
  • the isolated recombinant human sNPP1, fragment, and fusion proteins thereof can be produced in any useful protein expression system including, without limitation, cell culture (e.g., CHO cells, COS cells, HEK203), bacteria such as Escherichia coli (E. coli) and transgenic animals, including, but no limited to, mammals and avians (e.g., chickens, quail, duck and turkey).
  • cell culture e.g., CHO cells, COS cells, HEK203
  • bacteria such as Escherichia coli (E. coli) and transgenic animals, including, but no limited to, mammals and avians (e.g., chickens, quail, duck and turkey).
  • avians e.g., chickens, quail, duck and turkey.
  • a construct that encodes the sNPP1 and includes a suitable signal sequence e.g, from human Ig heavy chain, NPP2, NPP4, NPP7 or human serum albumin, for example
  • compositions typically include a pharmaceutically acceptable carrier or excipient.
  • compositions comprising such carriers, including composite molecules are formulated by well-known conventional methods (see, for example, Remington's Pharmaceutical Sciences, 14 th ed., Mack Publishing Co., Easton, Pa.), the entire teachings of which are incorporated herein by reference.
  • the carrier may comprise a diluent.
  • the pharmaceutical carrier can be a liquid and the fusion protein may be in the form of a solution.
  • the pharmaceutical carrier can be wax, fat, or alcohol.
  • the pharmaceutically acceptable carrier may be a solid in the form of a powder, a lyophilized powder, or a tablet.
  • the carrier may comprise a liposome or a microcapsule.
  • the pharmaceutical compositions can be in the form of a sterile lyophilized powder for injection upon reconstitution with a diluent.
  • the diluent can be water for injection, bacteriostatic water for injection, or sterile saline.
  • the lyophilized powder may be produced by freeze drying a solution of the fusion protein to produce the protein in dry form.
  • the lyophilized protein generally has increased stability and a longer shelf life than a liquid solution of the protein.
  • the present invention is further exemplified by the following examples.
  • the examples are for illustrative purpose only and are not intended, nor should they be construed as limiting the invention in any manner.
  • mice Six week old wildtype male C57B1/6J mice were used. The average weight of these mice ranged from 21-22 g. Mice were dosed with sNPP1-Fc [1.04 mg/ml] or sNPP1-Fc-D10 [1.03 mg/ml] by subcutaneous (SC) or intravenous (IV) injection at a concentration of 5 mg/kg. Table 1.
  • mice lacking NPP1 Two different strains of mice lacking NPP1 were used. Enpp1 ⁇ / ⁇ mice were previously described in Lomashvili, K. A. et al., Kidney Int 2014, 85, 1351-1356. To accelerate arterial calcification, the diet was supplemented with 1.5% phosphate (final phosphorus content: 2%) using a mixture of NaH 2 PO 4 and Na 2 HPO 4 in proportions to yield a neutral pH as previously described. (O'Neill, W. C. et al., Kidney Int 2011, 79, 512-517).
  • CKD Chronic Kidney Disease
  • Wild-type sprague dawley rats were used in CKD model studies.
  • the rats were fed a diet containing 0.25-0.75% adenine and high levels of phosphorus (0.75-0.9% phosphorus versus 0.4% in normal chow).
  • the excess dietary adenine saturates the normal adenine phosphoribosyltransferase salvage pathway and is instead metabolized to 2,8-dihydroxyadenine, which precipitates and forms crystals in the kidney tubules due to its low solubility. These crystals cause tubular injury, inflammation, obstruction, and fibrosis in the kidneys and lead to a phenotype consistent with human CKD.
  • the resulting kidney damage and renal failure leads to impaired phosphate excretion resulting in abnormally high serum Pi levels and disordered mineral metabolism, such as general calcification of soft tissues.
  • the high level of phosphorus in the diet accelerates arterial calcification.
  • Rats on the high adenine diet develop uremia, hyperphosphatemia, secondary hyperparathyroidism, renal osteodystrophy, and vascular calcification.
  • NPP1 activity was measured as previously described. (Villa-Bellosta, R. et al., Am J Physiol Heart Circ Physiol 2011, 301, H61-H68). Briefly, plasma was added to 20 volumes of physiologic buffer containing 200 nM ATP and 1.5 uCi [32P] ATP/ml for 10 minutes at 37° C. The reaction was then separated by thin-layer chromatography on polyethyleneimine cellulose and the amount of PPi produced was determined by densitometry of autoradiograms. Plasma PPi was measured as previously described (Lomashvili, K. A.
  • leukocytes and platelets freshly drawn, heparinized human blood was centrifuged at 250 g for 15 minutes at room temperature. The plasma was removed and centrifuged at 2200 g for 12 minutes to obtain platelets. The pellet from the first centrifugation was re-suspended in normal saline to the original blood volume and 4 volumes of lysis buffer (155 mmol/L ammonium chloride; 10 mmol/L sodium bicarbonate; 0.1 mmol/L EDTA, pH 7.4) was added on ice for 5-10 minutes. This was repeated after centrifugation and removal of the supernatant, yielding purified leukocytes after a final centrifugation.
  • lysis buffer 155 mmol/L ammonium chloride; 10 mmol/L sodium bicarbonate; 0.1 mmol/L EDTA, pH 7.4
  • the experiment was conducted to determine whether there is an increase in PPi levels of wild-type mice that are dosed with variants of sNPP1. For this, 1 hour time point was selected for a single intravenous injection therapy and 4 hour time point for single subcutaneous injection therapy. The estimation of PPi levels was determined by the abcam PPi fluorometric assay.
  • FIG. 5 illustrates pyrophosphate level in blood in wild-type mice after administration of sNPP1-Fc or sNPP1-Fc-D10 intravenously (1 hour post injection) and subcutaneously (4 hour post injection).
  • Enpp1( ⁇ / ⁇ ) knock-out mice were treated subcutaneously with vehicle or 6 mg/kg sNPP1-Fc-D10 every other day over a period of 21 days. Aortic calcium levels are shown for males and females.
  • FIG. 6 shows effective prevention of aortic calcification in Enpp1( ⁇ / ⁇ ) mice with sNPP1-Fc-D10 treatment.
  • Enpp1( ⁇ / ⁇ ) knock-out mice was treated with 6 mg/kg sNPP1-Fc-D10 intravenously to determine blood PPi and enzymatic activity levels.
  • plasma at time points of 0, 4, 24, 48, and 72 hours were collected and analyzed for NPP1 activity (dashed) and PPi levels (solid).
  • the wild-type PPi level was determined to be 2.18 ⁇ M (data not shown).
  • the dashed lines from top to bottom show the PPi levels for wild-type, heterozygous Enpp1(+/ ⁇ ), and homozygous Enpp1( ⁇ / ⁇ ) mice (Li et. al, 2013).
  • the profiles for sNPP1-Fc were similar to those of sNPP1-Fc-D10.
  • FIG. 8 illustrates increased survival of Enpp1 asj homozygous male mice treated with 5 mg/kg sNPP1-Fc in comparison to vehicle treated mice.
  • Wild-type and Enpp1 asj mice were placed on a high phosphorus, low magnesium diet starting at birth and treated with vehicle or sNPP1-Fc (5 mg/kg) subcutaneously every other day starting at 14 days of age to determine growth rates.
  • percent body weight gain for wild-type (solid line) and Enpp1 asj (circles) mice were plotted from two to nine weeks of age.
  • FIGS. 9 A and 9 B illustrates increased percent body weight gain of Enpp1 asj male mice treated with 5 mg/kg sNPP1-Fc in comparison to vehicle treated mice. All Enpp1 asj animals were dead (open circle) in the vehicle group at nine weeks (upper panel).
  • FIGS. 10 A- 10 C illustrate pictures of wild-type ( FIG. 10 A , top), vehicle treated Enpp1 asj ( FIG. 10 B , middle) sNPP1-Fc treated (5mg/Kg) treated Enpp1 asj ( FIG. 10 C , bottom) mice.
  • FGF-23 Fibroblast growth factor 23
  • Wild-type and Enpp1 asj mice were placed on a high phosphorus, low magnesium diet (TD.00442, Harlan) starting at birth.
  • Vehicle or sNPP1-Fc-D10 (5 mg/kg) was dosed subcutaneously every other day starting at 18 days of age. All serum was collected 24 hours after dosing and analyzed using a mouse FGF-23 ELISA kit (Kainos Laboratories Inc., Tokyo, Japan).
  • FGF-23 levels were measured at baseline (day 0), prior to initiation of treatment and during the course of treatment in Enpp1 +/+ -Vehicle (solid black), Enpp1 asj/asj -Vehicle (dotted black), and Enpp1 asj/asj -sNPP1-Fc-D10 (solid grey) mice.
  • FIG. 11 illustrates levels of fibroblast growth factor vehicle treated Enpp1 asj/asj (middle) sNPP1-Fc treated (5 mg/Kg) treated Enpp1 asj (bottom) mice.
  • the recombinant sNPP1-Fc-D10 fully hydrolyzed ATP to PPi in vitro with no hydrolysis of the PPi to orthophosphate as shown in FIG. 13 A .
  • the enzyme activity in plasma is shown in FIG. 13 B .
  • Substantial activity was present in the plasma of wild-type mice, with slightly more than one third of the ATP converted to PPi in 10 minutes corresponding to an activity of 7.6 ⁇ 1.0 nmol/h/ml. The remainder was converted to orthophosphate via nucleotide triphosphatases.
  • Plasma from Enpp1 ⁇ / ⁇ mice was essentially devoid of NPP1, with the small amount of PPi representing PPi contaminating the [32P] ATP.
  • NPP1 activity was not detectable in aortas from either wild-type or Enpp1 ⁇ / ⁇ mice and did not increase after injection of NPP1 as shown in FIG. 13 C . Activity was also not detected in liver after the administration of recombinant NPP1.
  • NPP1 activity and PPi concentration peaked 12 hours after injection at levels that were 195% and 41% respectively of those in wild-type littermates. The levels decreased rapidly and were essentially undetectable after 24 hours.
  • Subcutaneous injection of sNPP1-Fc-D10 shows a correlation between the plasma PPi levels and plasma NPP1 activity as shown in FIG. 15 .
  • the correlation of plasma PPi with plasma NPP1 suggested that the PPi was generated in the circulation. This was examined by incubating fresh human blood with recombinant NPP1 and then measuring PPi in the plasma. Human blood was used because of the limited amount of blood obtainable from mice. The amount of NPP1 added to the blood was calculated so as to yield levels similar to those achieved after injection in mice.
  • FIG. 16 A illustrates that administration of recombinant NPP1 increased plasma PPi when added to whole blood for 2 hours but not when added to plasma alone, indicating a cellular requirement.
  • blood was centrifuged and plasma was removed either with or without the buffy coat remaining.
  • HEPES-buffered saline was then added to restore the original hematocrit.
  • FIG. 16 B production only occurred when the buffy coat was retained, indicating a requirement for leukocytes or platelets but not erythrocytes.
  • Incubation of isolated leukocytes or platelets in HEPES-buffered saline indicated that both either released or produced PPi but that synthesis in response to exogenous NPP1 occurred only with leukocytes as shown in FIG. 16 C .
  • Enpp1 ⁇ / ⁇ mice aged were placed on a high phosphate diet and treated with vehicle or sNPP1-Fc-D10 (6 mg/kg) subcutaneously every other day as shown in FIG. 17 to determine the effect of recombinant NPP1 on arterial calcification.
  • Each treated mouse was paired with a mouse of the same gender and similar age that received the same volume of vehicle alone.
  • NPP1 activity and PPi were both undetectable.
  • aortic NPP1 activity was undetectable after 3 injections of recombinant NPP1 every other day.
  • This example discloses the efficacy of sNPP1-Fc-D10 in treating chronic kidney disease (CKD) in uremic rat models.
  • CKD chronic kidney disease
  • the uremic rats were fed a high adenine diet and injected subcutaneously with control or sNPP1-Fc-D10 (5 mg/kg), 5 dose per week as illustrated in FIG. 18 .
  • the normal aortic calcium content was 5 nmol/mg.
  • Examples VII and VIII demonstrate the activity of sNPP1 and effective use of sNPP1 in models of ectonucleotide pyrophosphate pyrophosphorylase deficiency and chronic kidney disease. These examples show that a transient increase in PPi is sufficient for an effective therapy of vascular calcification and NPP1 deficiency.

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