WO2008025170A1 - Selective glycosidase inhibitors and uses thereof - Google Patents
Selective glycosidase inhibitors and uses thereof Download PDFInfo
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- WO2008025170A1 WO2008025170A1 PCT/CA2007/001554 CA2007001554W WO2008025170A1 WO 2008025170 A1 WO2008025170 A1 WO 2008025170A1 CA 2007001554 W CA2007001554 W CA 2007001554W WO 2008025170 A1 WO2008025170 A1 WO 2008025170A1
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- 239000011712 vitamin K Substances 0.000 description 1
- 150000003721 vitamin K derivatives Chemical class 0.000 description 1
- 229940046010 vitamin k Drugs 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
- 230000029663 wound healing Effects 0.000 description 1
- WJJYZXPHLSLMGE-UHFFFAOYSA-N xaliproden Chemical compound FC(F)(F)C1=CC=CC(C=2CCN(CCC=3C=C4C=CC=CC4=CC=3)CC=2)=C1 WJJYZXPHLSLMGE-UHFFFAOYSA-N 0.000 description 1
- 229960004664 xaliproden Drugs 0.000 description 1
- PMBLXLOXUGVTGB-UHFFFAOYSA-N zanapezil Chemical compound C=1C=C2CCCCNC2=CC=1C(=O)CCC(CC1)CCN1CC1=CC=CC=C1 PMBLXLOXUGVTGB-UHFFFAOYSA-N 0.000 description 1
- 229950010696 zanapezil Drugs 0.000 description 1
Classifications
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- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/68—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving proteins, peptides or amino acids
- G01N33/6803—General methods of protein analysis not limited to specific proteins or families of proteins
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- C07D513/02—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for in groups C07D463/00, C07D477/00 or C07D499/00 - C07D507/00 in which the condensed system contains two hetero rings
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- C07D513/12—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for in groups C07D463/00, C07D477/00 or C07D499/00 - C07D507/00 in which the condensed system contains three hetero rings
- C07D513/14—Ortho-condensed systems
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- C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic Table
- C07F9/02—Phosphorus compounds
- C07F9/547—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom
- C07F9/6561—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom containing systems of two or more relevant hetero rings condensed among themselves or condensed with a common carbocyclic ring or ring system, with or without other non-condensed hetero rings
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- C07H9/06—Compounds containing a hetero ring sharing at least two hetero atoms with a saccharide radical the hetero ring containing nitrogen as ring hetero atoms
Definitions
- This application relates to compounds which selectively inhibit glycosidases and uses thereof.
- O-GlcNAcase 6 The enzyme responsible for post-translationally linking ⁇ -N-acetylglucosamine (GIcNAc) to specific serine and threonine residues of numerous nucleocytoplasmic proteins is O- GIcNAc transferase (OGTase). 2 5 A second enzyme, known as O-GlcNAcase 6 ' 7 removes this post-translational modification to liberate proteins making the O-GlcNAc-modification a dynamic cycle occurring several times during the lifetime of a protein. 8
- 14 O-GlcNAc is also found on many structural proteins. 15"17 For example, it has been found on a number of cytoskeletal proteins, including neurofilament proteins, 18 ' 19 synapsins, synapsin-specific clathrin assembly protein AP-3, 7 and ankyrinG. 14 O-GlcNAc modification has been found to be abundant in the brain. ' It has also been found on proteins clearly implicated in the etiology of several diseases including Alzheimer's disease (AD) and cancer.
- AD Alzheimer's disease
- AD Alzheimer's disease
- ALS amyotrophic lateral sclerosis
- PHFs cytoskeletal protein
- tau Normally tau stabilizes a key cellular network of microtubules that is essential for distributing proteins and nutrients within neurons.
- tau becomes hyperphosphorylated, disrupting its normal functions, forming PHFs and ultimately aggregating to form NFTs.
- Six isoforms of tau are found in the human brain.
- all six isoforms of tau are found in NFTs, and all are markedly hyperphosphorylated.
- Tau in healthy brain tissue bears only 2 or 3 phosphate groups, whereas those found in the brains of AD patients bear, on average, 8 phosphate groups.
- O-GlcNAc is a dynamic modification that can be removed and reinstalled several times during the lifespan of a protein. Suggestively, the gene encoding O- GlcNAcase has been mapped to a chromosomal locus that is linked to AD. 7 ' 42
- Hyperphosphorylated tau in human AD brains has markedly lower levels of O-GlcNAc than are found in healthy human brains. 21 Very recently, it has been shown that O-GlcNAc levels of soluble tau protein from human brains affected with AD are markedly lower than those from healthy brain. 21 Furthermore, PHF from diseased brain was suggested to lack completely any O-GlcNAc modification whatsoever. 21 The molecular basis of this hypoglycosylation of tau is not known, although it may stem from increased activity of kinases and/or dysfunction of one of the enzymes involved in processing O-GlcNAc.
- UDP-GIcNAc undine diphosphate- N-acetylglucosamine
- OGTase recognizes many of its substrates 54 ' 55 and binding partners 41 ' 56 through its tetratricopeptide repeat (TPR) domains. 57 ' 58 As described above, O- GlcNAcase 6 ' 7 removes this post-translational modification to liberate proteins making the O-GlcNAc-modification a dynamic cycle occurring several times during the lifetime of a protein. O-GlcNAc has been found in several proteins on known phosphorylation sites, 10 ' 37 ' 38 ' 59 including tau and neurofilaments. 60 Additionally, OGTase shows unusual kinetic behaviour making it extremelyly sensitive to intracellular UDP-GIcNAc substrate concentrations and therefore glucose supply. 41
- TPR tetratricopeptide repeat
- O- glycoprotein 2-acetamido-2-deoxy- ⁇ -D-glucopyranosidase O-GlcNAcase
- O-GlcNAcase is a member of family 84 of glycoside hydrolases that includes enzymes from organisms as diverse as prokaryotic pathogens to humans (for the family classification of glycoside hydrolases see Coutinho, P.M. & Henrissat, B.
- O-GlcNAcase acts to hydrolyse 0-GlcNAc off of serine and threonine residues of post-translationally modified proteins. 1 ' 6 ' 7 ' 78 ' 79 Consistent with the presence of O-GlcNAc on many intracellular proteins, the enzyme O- GlcNAcase appears to have a role in the etiology of several diseases including type II diabetes, 14 ' 80 AD, 16 ' 21 ' 81 and cancer.
- O-GlcNAcase was likely isolated earlier on, 18 ' 19 about 20 years elapsed before its biochemical role in acting to cleave O-GlcNAc from serine and threonine residues of proteins was understood. 6 More recently O- GlcNAcase has been cloned, 7 partially characterized, 20 and suggested to have additional activity as a histone acetyltransferase. 20 However, little was known about the catalytic mechanism of this enzyme.
- HEXA and HEXB encode enzymes catalyzing the hydrolytic cleavage of terminal ⁇ -N-acetyl glucosamine residues from glycoconjugates.
- the gene products of HEXA and HEXB predominantly yield two dimeric isozymes, hexosaminidase A and hexosaminidase B, respectively.
- Hexosaminidase A ( ⁇ ), a heterodimeric isozyme is composed of an ⁇ - and a ⁇ -subunit.
- Hexosaminidase B ( ⁇ ) a homodimeric isozyme, is composed of two ⁇ -subunits.
- Both of these enzymes are classified as members of family 20 of glycoside hydrolases and are normally localized within lysosomes.
- the proper functioning of these lysosomal ⁇ -hexosaminidases is critical for human development, a fact that is underscored by the tragic genetic illnesses, Tay-Sach's and S andhoff diseases which stem from a dysfunction in, respectively, hexosaminidase A and hexosaminidase B.
- These enzymatic deficiencies cause an accumulation of glycolipids and glycoconjugates in the lysosomes resulting in neurological impairment and deformation. The deleterious effects of accumulation of gangliosides at the organismal level are still being uncovered.
- STZ has long been used as a diabetogenic compound because it has a particularly detrimental effect on ⁇ -islet cells.
- 94 STZ exerts its cytotoxic effects through both the alkylation of cellular DNA 94 ' 95 as well as the generation of radical species including nitric oxide.
- the resulting DNA strand breakage promotes the activation of poly(ADP-ribose) polymerase (PARP) 97 with the net effect of depleting cellular NAD+ levels and, ultimately, leading to cell death.
- PARP poly(ADP-ribose) polymerase
- NAG-thiazoline has been found to be a potent inhibitor of family 20 hexosaminidases, 88 ' 107 and more recently, the family 84 O-GlcNAcases. 106 Despite its potency, a downside to using NAG-thiazoline in a complex biological context is that it lacks selectivity and therefore perturbs multiple cellular processes. [0019] PUGNAc is another compound that suffers from the same problem of lack of selectivity, yet has enjoyed use as an inhibitor of both human O-GlcNAcase 6 ' 108 and the family 20 human ⁇ -hexosaminidases.
- the invention provides, in part, compounds for selectively inhibiting glycosidases, prodrugs of the compounds, uses of the compounds and the prodrugs, pharmaceutical compositions including the compounds or prodrugs of the compounds, amd methods of treating diseases and disorders related to deficiency or overexpression of O-GlcNAcase, accumulation or deficiency of O-GlcNAc.
- the invention provides a compound of Formula (I) or a pharmaceutically acceptable salt thereof: [0023]
- each R 1 is independently a non-interfering substituent
- R 2 is alkyl, aryl, heteroaryl, OR 4 , NR 4 2 , and NR 4 OR 4 , each of which may be optionally substituted with a non-interfering substituent
- R 3 is OR 4 , N 3 , or NR 4 2
- each R 4 is independently a non- interfering substituent, with the proviso that when each R 1 is H and R 3 is OH, R 2 excludes CH 3 , CH 2 CH 3 , (CH 2 ) 2 CH 3 , (CH 2 ) 3 CH 3 , (CH 2 ) 4 CH 3 , (CH 2 ) 5 CH 3 , CH(CH 3 ) 2 , CH 2 CH(CH 3 ) 2 , NH(phenyl), NH(4-methoxyphenyl), N(CHj) 2 , (CH 2 ) 2 P(O)(OH)(OCH 3 ), and (CH 2 ) 2 P(O)
- each R 1 may be connected to form an additional ring structure; or when R 3 is OR 4 , R 4 may be connected to either R 1 to form an additional ring structure.
- the non-interfering substituent may be alkyl, alkenyl, alkynyl, aryl, arylalkyl, arylalkenyl, or arylalkynyl, or may include one or more heteroatoms selected from P, O, S, and N.
- the non-interfering substituent may be optionally substituted.
- R 1 may be H or C(O)CH 3 ;
- R 3 may be OH, OC(O)CH 3 , N 3 , or NH 2 .
- the compound may be a compound described in Table 1 ; the compound may exclude one or more of the compounds described in Table 2 or Table 3; the compound may be a prodrug; the compound may selectively inhibit an O-glycoprotein 2- acetamido-2-deoxy- ⁇ -D-glucopyranosidase (O-GlcNAcase); the compound may selectively bind an O-GlcNAcase (e.g., a mammalian O-GlcNAcase); the compound may selectively inhibit the cleavage of a 2-acetamido-2-deoxy- ⁇ -D-glucopyranoside (O-GlcNAc); the compound may not substantially inhibit a mammalian ⁇ -hexosaminidase.
- O-GlcNAcase O-glycoprotein 2- acetamido-2-deoxy- ⁇ -D-glucopyranosidase
- O-GlcNAcase O-glycoprotein 2- acetamido-2-deoxy
- the invention provides a pharmaceutical composition including a compound according to the invention, in combination with a pharmaceutically acceptable carrier.
- the invention provides methods of selectively inhibiting an O- GlcNAcase, or of inhibiting an OGIcN Acase in a subject in need thereof, or of increasing the level of O-GlcNAc, or of treating a neurodegenerative disease, a tauopathy, cancer or stress, in a subject in need thereof, by administering to the subject an effective amount of a compound of Formula (I) or a pharmaceutically acceptable salt thereof:
- each R may be independently a non-interfering substituent;
- R may be alkyl, aryl, heteroaryl, OR 4 , NR 4 2 , and NR 4 OR 4 , each of which maybe optionally substituted with a non-interfering substituent;
- R 3 may be OR 4 , N 3 , or NR 4 2 ; and each R 4 may be independently a non-interfering substituent, with the proviso that when each R 1 is H and R 3 is OH, R 2 excludes CH 2 CH 3 , (CH 2 ) 2 CH 3 , (CH 2 ) 3 CH 3 , (CH 2 ) 4 CH 3 , CH(CH 3 ) 2 , and CH 2 CH(CH 3 ) 2 ; and with the proviso that when each R 1 is COCH 3 and R 3 is OC(O)CH 3 , R 2 excludes CH 2 CH 3 , (CH 2 ) 2 CH 3 , (CH 2 ) 3 CH 3 , (CH 2 ) 4 CH 3
- the condition may be Alzheimer's disease, Amyotrophic lateral sclerosis (ALS), Amylotrophic lateral sclerosis with cognitive impairment (ALSci), Argyrophilic grain dementia, Bluit disease, Corticobasal degeneration (CBD), Dementia pugilistica, Diffuse neurofibrillary tangles with calcification, Down's syndrome, Familial British dementia, Familial Danish dementia, Frontotemporal dementia with parkinsonism linked to chromosome 17 (FTDP- 17), Gerstmann-Straussler-Scheinker disease, Guadeloupean parkinsonism, Hallevorden- Spatz disease (neurodegeneration with brain iron accumulation type 1), Multiple system atrophy, Myotonic dystrophy, Niemann-Pick disease (type C), Pallido-ponto-nigral degeneration, Parkinsonism-dementia complex of Guam, Pick's disease (PiD), Postencephalitic parkinsonism (PEP), Prion diseases (including Creutz
- the stress may be a cardiac disorder, e.g., ischemia; hemorrhage; hypovolemic shock; myocardial infarction; an interventional cardiology procedure; cardiac bypass surgery; fibrinolytic therapy; angioplasty; or stent placement.
- ischemia e.g., ischemia; hemorrhage; hypovolemic shock; myocardial infarction; an interventional cardiology procedure; cardiac bypass surgery; fibrinolytic therapy; angioplasty; or stent placement.
- the invention provides a method of treating an O-GlcNAcase- mediated condition that excludes a neurodegenerative disease, a tauopathy, cancer or stress, in a subject in need thereof, by administering to the subject an effective amount of a compound of Formula (I) or a pharmaceutically acceptable salt thereof:
- each R 1 may be independently a non-interfering substituent
- R 2 may be alkyl, aryl, heteroaryl, OR 4 , NR 4 2 , and NR 4 OR 4 , each of which may be optionally substituted with a non-interfering substituent
- R 3 may be OR 4 , N 3 , or NR 4 2
- each R 4 may be independently a non-interfering substituent.
- the condition may be inflammatory or allergic diseases such as asthma, allergic rhinitis, hypersensitivity lung diseases, hypersensitivity pneumonitis, eosinophilic pneumonias, delayed-type hypersensitivity, atherosclerosis, interstitial lung disease (ILD) (e.g., idiopathic pulmonary fibrosis, or ILD associated with rheumatoid arthritis, systemic lupus erythematosus, ankylosing spondylitis, systemic sclerosis, Sjogren's syndrome, polymyositis or dermatomyositis); systemic anaphylaxis or hypersensitivity responses, drug allergies, insect sting allergies; autoimmune diseases, such as rheumatoid arthritis, psoriatic arthritis, multiple sclerosis, systemic lupus erythematosus, myastenia gravis, glomerulonephritis, autoimmune thyroiditis, graft rejection, including allograft rejection or graft-
- ILD
- R 1 may be H or C(O)CH 3 ;
- R 3
- the invention provides use of a compound of an effective amount of a compound of Formula (I) or a pharmaceutically acceptable salt thereof:
- each R 1 may be independently a non-interfering substituent
- R 2 may be alkyl, aryl, heteroaryl, OR 4 , NR 4 2 , and NR 4 OR 4 , each of which may be optionally substituted with a non-interfering substituent
- R 3 may be OR 4 , N 3 , or NR 4 2
- each R 4 may be independently a non-interfering substituent, with the proviso that the compound of Formula (I) excludes the compounds described in Tables 2 and 3, in the preparation of a medicament.
- the medicament may be for selectively inhibiting an O-GlcNAcase, for increasing the level of O-GlcNAc, for treating a condition modulated by an O-GlcNAcase, for treating a neurodegenerative disease, a tauopathy, a cancer, or stress.
- the inventio provides a method for screening for a selective inhibitor of an O-GlcNAcase, by a) contacting a first sample with a test compound; b) contacting a second sample with a compound of Formula (I)
- each R 1 may be independently a non-interfering substituent
- R 2 may be alkyl, aryl, heteroaryl, OR 4 , NR 4 2 , and NR 4 OR 4 , each of which may be optionally substituted with a non-interfering substituent
- R 3 may be OR 4 , N 3 , or NR 4 2
- each R 4 may be independently a non-interfering substituent
- FIGURES IA-F show Western blots of proteins from muscle and brain tissue of rats injected with various doses of (3aR,5R,6S,7R,7aR)-5-(hydroxymethyl)-2-propyl- 5,6,7,7a-tetrahydro-3aH-pyrano[3,2-d]thiazole-6,7-diol (NAG-Bt) or vehicle alone (PBS).
- FIGURES 2A-I show Western blots of proteins from brain tissue of rats treated with or without NAG-Bt showing changes in brain tau phosphorylation at multiple sites following treatment. Equal amounts of homogenized brain tissue from an animal treated with and without NAG-Bt were separated by SDS-PAGE followed by probing with each of the primary antibodies, as indicated, and an appropriate secondary antibody (either an anti- mouse or anti-rabbit IgG-HRP conjugate, as appropriate). The lanes labeled "+” indicate samples from animals receiving NAG-Bt, while lanes labeled "-" indicate samples from animals receiving vehicle alone.
- FIGURES 3A-B show Western blots of proteins from cardiac tissue of rats injected with 50 mg/kg of NAG-AE or vehicle alone (PBS) and sacrificed at various lengths of time following injection. Equal amounts of homogenized cardiac tissue from animals treated with NAG-AE for the indicated lengths of time were separated by SDS-PAGE followed by probing with the primary ⁇ -O-GlcNAc antibody and an anti-IgM-mouse IgG-HRP conjugate (A).
- Figure 3B shows a Western blot of samples loaded in Figure 3 A and probed using an anti- ⁇ -actin mAb clone AC-40 followed by an anti-mouse IgG-HRP conjugate.
- FIGURES 4A-H show stained hippocampus brain tissue sections collected from P301L JNPL3 mice, a transgenic model that develops hyperphosphorylated tau protein and NFTs.
- Group E are wild-type control mice that received vehicle alone;
- Group A are transgenic mice that received vehicle alone;
- Group B are transgenic mice that received 100 mg/kg/day NAG-Bt orally for 16 weeks, then 1000 mg/kg/day NAG-Bt orally for 16 weeks;
- Group D are transgenic mice that received 500 mg/kg/day NAG-AE orally for 16 weeks; all mice were 42-44 weeks of age at the time of sacrifice.
- Panels on the right show sections stained with anti-OGlcNAc antibody (a marker for protein O-GlcNAc levels), while panels on the left ( Figures A-D) show sections stained with anti-phospho Tau-Ser404 antibody (a marker for levels of tau phosphorylation and NFT formation).
- Animals receiving either NAG-Bt or NAG-AE shown elevated protein O-GlcNAc levels and significantly decreased formation of hyperphosphorylated tau and NFTs when compared to the untreated transgenic group (Group A).
- the boxed area in each panel indicates similar regions from each brain section in the transgenic animals, highlighted for comparative purposes.
- FIGURES 5A-D show long-term effects of oral dosing (100 mg/kg/day) of Sprague-Dawley rats with NAG-Bt on weight (A), food consumption (B), water consumption (C), and blood glucose levels (D) determined over four months. Data for eight control rats (squares) versus eight dosed rats (circles) are plotted on all graphs; no significant differences were noted.
- FIGURE 6 is a bar graph showing results for organ weight measurements (brain, liver, pancreas, spleen, heart, fat, muscle) on rats dosed orally with NAG-Bt for 8 months at 100 mg/kg/day versus controls. Measurements were made on 6 rats per group, which were averaged. No significant differences were observed.
- FIGURES 7A-G show Western blots of proteins from brain tissue of rats treated orally with NAG-AE (200 mg/kg/day in drinking water) or with vehicle alone (normal drinking water, 0 mg/kg/day), showing decreases in brain tau phosphorylation at multiple sites following treatment, as well as global increases in protein O-GlcNAc levels. Equal amounts of homogenized brain tissue from animals treated with and without NAG-AE (3 animals each) were separated by SDS-PAGE followed by probing with each of the primary antibodies and an appropriate secondary antibody.
- Figure 7A shows the Western blot of samples probed with Tau-5 (a phospho-independent tau antibody), and demonstrates equal loading of tau protein.
- Figures 7B-D show Western blots of the same samples probed with specific anti-phospho-tau antibodies, while Figure 7E shows analysis of the Western blot results by densitometry.
- Figure 7F shows a Western blot of whole brain lysates from these animals probed with the primary ⁇ -O-GlcNAc antibody, showing increases the global levels of O-GlcNAc in the brains of animals receiving NAG-AE.
- Figure 7G shows the same samples as in Figure 7F, probed using an anti- ⁇ -actin antibody and demonstrates equal sample loading.
- the invention provides, in part, novel compounds that are capable of inhibiting an O-glycoprotein 2-acetamido-2-deoxy- ⁇ -D-glucopyranosidase (O-GlcNAcase).
- O-GlcNAcase is a mammalian O-GlcNAcase, such as a rat, mouse or human O-GlcNAcase.
- ⁇ -hexosaminidase is a mammalian ⁇ - hexosaminidase, such as a rat, mouse or human ⁇ -hexosaminidase.
- compounds according to the invention exhibit a surprising and unexpected selectivity in inhibiting an O-GlcNAcase.
- the compounds according to the invention are surprisingly effective inhibitors of an O-GlcNAcase.
- the compounds according to the invention are surprisingly more selective for an O-GlcNAcase over a ⁇ - hexosaminidase.
- the compounds selectively inhibit the activity of a mammalian O-GlcNAcase over a mammalian ⁇ -hexosaminidase.
- a selective inhibitor of an O-GlcNAcase does not substantially inhibit a ⁇ -hexosaminidase.
- a compound that "selectively" inhibits an O-GlcNAcase is a compound that inhibits the activity or biological function of an O-GlcNAcase, but does not substantially inhibit the activity or biological function of a ⁇ -hexosaminidase.
- a selective inhibitor of an O-GlcNAcase selectively inhibits the cleavage of 2-acetamido-2- deoxy- ⁇ -D-glucopyranoside (O-GlcNAc) from polypeptides.
- a selective inhibitor of an O-GlcNAcase selectively binds to an O-GlcNAcase. In some embodiments, a selective inhibitor of an O-GlcNAcase inhibits hyperphosphorylation of a tau protein and/or inhibits formations of NFTs.
- inhibitors means a decrease by any value between 10% and 90%, or of any integer value between 30% and 60%, or over 100%, or a decrease by 1-fold, 2-fold, 5-fold, 10-fold or more.
- a selective inhibitor of an O-GlcNAcase elevates or enhances O-GlcNAc levels e.g., O- GlcNAc-modified polypeptide or protein levels, in cells, tissues, or organs (e.g., in brain, muscle, or heart (cardiac) tissue) and in animals.
- O-GlcNAc levels e.g., O- GlcNAc-modified polypeptide or protein levels
- O-GlcNAc-modified polypeptide or protein levels in cells, tissues, or organs (e.g., in brain, muscle, or heart (cardiac) tissue) and in animals.
- elevating or “enhancing” is meant an increase by any value between 10% and 90%, or of any integer value between 30% and 60%, or over 100%, or an increase by 1-fold, 2-fold, 5-fold, 10-fold, 15-fold, 25-fold, 50- fold, 100-fold or more.
- a selective inhibitor of an O-GlcNAcase exhibits a selectivity ratio, as described herein, in the range 100 to 100000, or in the range 1000 to 100000, or at least 100, 200, 500, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500, 5000, 6000, 7000, 10,000, 25,000, 50,000, 75,000, or any value within or about the described range.
- the compounds of the present invention elevate O-GlcNAc levels on O-GlcNAc- modified polypeptides or proteins in vivo specifically via interaction with an O-GlcNAcase enzyme, and are effective in treating conditions which require or respond to inhibition of O- GlcNAcase activity.
- the compounds of the present invention are useful as agents that produce a decrease in tau phosphorylation and NFT formation. In some embodiments, the compounds are therefore useful to treat Alzheimer's disease and related tauopathies. In some embodiments, the compounds are thus capable of treating Alzheimer's disease and related tauopathies by lowering tau phosphorylation and reducing NFT formation as a result of increasing tau O-GlcNAc levels. In some embodiments, the compounds produce an increase in levels of O-GlcNAc modification on O-GlcNAc-modified polypeptides or proteins, and are therefore useful for treatment of disorders responsive to such increases in O-GlcNAc modification; these disorders include without limitation neurodegenerative, inflammatory, cardiovascular, and immunoregulatory diseases.
- the compounds are also useful as a result of other biological activites related to their ability to inhibit the activity of glycosidase enzymes.
- the compounds of the invention are valuable tools in studying the physiological role of O-GlcNAc at the cellular and organismal level.
- the invention provides methods of enhancing or elevating levels of protein O-GlcNAc modification in animal subjects, such as, veterinary and human subjects. In alternative embodiments, the invention provides methods of selectively inhibiting an O-GlcNAcase enzyme in animal subjects, such as, veterinary and human subjects. In alternative embodiments, the invention provides methods of inhibiting phosphorylation of tau polypeptides, or inhibiting formation of NFTs, in animal subjects, such as, veterinary and human subjects.
- the invention provides compounds described generally by Formula (I) and the salts, prodrugs, and stereoisomeric forms thereof:
- each R 1 can be independently a non-interfering substituent
- R 2 can be alkyl, aryl, heteroaryl, OR 4 , NR 4 2 , or NR 4 OR 4 , each of which may be optionally substituted with a non-interfering substituent, and where each R 4 may be independently a non-interfering substituent
- R 3 can be OR 4 , N 3 , or NR 4 2 , where each R 4 may be independently a non-interfering substituent.
- each R 1 may be connected to form an additional ring structure.
- the OR 4 group may be connected to either R 1 to form an additional ring structure.
- each optionally substituted moiety may be substituted with one or more non-interfering substituents.
- R 5 may be alkyl, branched alkyl, cycloalkyl, aryl, or heteroaryl.
- R 1 as set forth in Formula (I), may be either hydrogen or a substituent that includes 1 -20 atoms that are other than hydrogen.
- R 1 may be H, alkyl, or C(O)R 5 , where R 5 may be alkyl, branched alkyl, cycloalkyl, aryl, or heteroaryl.
- R 1 may be H or C(O)CH 3 .
- R 2 as set forth in Formula (I), may be optionally substituted alkyl, OR, NR 2 , or NR 6 OR 6 , where R 6 may be H, alkyl, branched alkyl, cycloalkyl, aryl, or heteroaryl.
- R 3 as set forth in Formula (I), maybe OR, N 3 , or NR 7 2 , where R 7 may be H, alkyl, branched alkyl, cycloalkyl, aryl, or heteroaryl. In some embodiments, R 3 maybe OH, OC(O)CH 3 , N 3 , Or NH 2 .
- compounds according to Formula (I) include one or more of the compounds described in Table 1.
- compounds according to Formula (I) include one or more of the compounds described in Table 2. Table 2.
- compounds according to Formula (I) include one or more of the compounds described in Table 3.
- one or more of the compounds described in Tables 1, 2 or 3 are specifically excluded from the compounds described in Formula (I).
- specific stereoisomers or enantiomers of one or more of the compounds described in Tables 1, 2 or 3 are specifically excluded from the compounds described in Formula (I).
- specific precursors of one or more of the compounds described in Tables 1, 2 or 3 are specifically excluded from the compounds described in Formula (I).
- R 2 is not CH 3 , CH 2 CH 3 , (CH 2 ) 2 CH 3 , (CH 2 ) 3 CH 3 , (CH 2 ) 4 CH 3 , (CHa) 6 CH 3 , CH(CH 3 ) 2 , CH 2 CH(CH 3 ) 2 , NH(phenyl), NH(4-methoxyphenyl), N(CH 3 ) 2 , (CH 2 ) 2 P(O)(OH)(OCH 3 ), or (CH 2 ) 2 P(O)(OHXO(CH 2 ) 7 CH 3 ).
- R 2 excludes CH 3 , CH 2 CH 3 , (CH 2 ) 2 CH 3 , (CH 2 ) 3 CH 3 , (CH 2 ) 4 CH 3 , (CH 2 ) 6 CH 3 , CH(CH 3 ) 2 , CH 2 CH(CHs) 2 , NH(phenyl), NH(4-methoxyphenyl), N(CH 3 ) 2 , (CH 2 ) 2 P(O)(OH)(OCH 3 ), and (CH 2 ) 2 P(O)(OH)(O(CH 2 ) 7 CH 3 ), NHCH 3 , NH(CH 2 ) 2 CH 3 , NHCH(CH 3 ) 2 , NH(CH 2 ) 3 CH 3 , NH(cyclohexyl), NH(benzyl), CH 2 Br, CHBr 2 , CH 2 P(O)(OCH 2 CH
- a compound refers to one or more of such compounds
- the enzyme includes a particular enzyme as well as other family members and equivalents thereof as known to those skilled in the art.
- compound refers to the compounds discussed herein and includes precursors and derivatives of the compounds, including acyl-protected derivatives, and pharmaceutically acceptable salts of the compounds, precursors, and derivatives.
- the invention also includes prodrugs of the compounds, pharmaceutical compositions including the compounds and a pharmaceutically acceptable carrier, and pharmaceutical compositions including prodrugs of the compounds and a pharmaceutically acceptable carrier.
- all of the compounds of the invention contain at least one chiral center.
- the formulations, preparation, and compositions including compounds according to the invention include mixtures of stereoisomers, individual stereoisomers, and enantiomeric mixtures, and mixtures of multiple stereoisomers.
- the compound may be supplied in any desired degree of chiral purity.
- a "non-interfering substituent” is a substituent whose presence does not destroy the ability of the compound of Formula (I) to modulate the activity of the O- GlcNAcase enzyme. Specifically, the presence of the substituent does not destroy the effectiveness of the compound as a modulator of the activity of the O-GlcNAcase enzyme.
- the substituents may include, in addition to the substituents listed above, halo, OOCR, NROCR, where R is H or a substituent set forth above.
- Alkyl refers to a straight or branched hydrocarbon chain group consisting solely of carbon and hydrogen atoms, containing no unsaturation and including, for example, from one to ten carbon atoms, and which is attached to the rest of the molecule by a single bond. Unless stated otherwise specifically in the specification, the alkyl group may be optionally substituted by one or more substituents as described herein. Unless stated otherwise specifically herein, it is understood that the substitution can occur on any carbon of the alkyl group.
- alkenyl refers to a straight or branched hydrocarbon chain group consisting solely of carbon and hydrogen atoms, containing at least one double bond and including, for example, from two to ten carbon atoms, and which is attached to the rest of the molecule by a single bond or a double bond. Unless stated otherwise specifically in the specification, the alkenyl group may be optionally substituted by one or more substituents as described herein. Unless stated otherwise specifically herein, it is understood that the substitution can occur on any carbon of the alkenyl group.
- Alkynyl refers to a straight or branched hydrocarbon chain group consisting solely of carbon and hydrogen atoms, containing at least one triple bond and including, for example, from two to ten carbon atoms. Unless stated otherwise specifically in the specification, the alkenyl group may be optionally substituted by one or more substituents as described herein.
- Aryl refers to a phenyl or naphthyl group, including for example, 5-12 members. Unless stated otherwise specifically herein, the term “aryl” is meant to include aryl groups optionally substituted by one or more substituents as described herein.
- Arylalkyl refers to a group of the formula -R a Rb where R 3 is an alkyl group as described herein and R b is one or more aryl moieties as described herein.
- the aryl group(s) may be optionally substituted as described herein.
- Arylalkenyl refers to a group of the formula -R 0 R b where R 0 is an alkenyl moiety as described herein and R b is one or more aryl groups as described herein.
- the aryl group(s) and the alkenyl group may be optionally substituted as described herein.
- Acyl refers to a group of the formula -C(O)R 3 , where R 3 is an alkyl group as described herein.
- the alkyl group(s) may be optionally substituted as described herein.
- Arylacyl refers to a group of the formula -C(O)R b , where R b is an aryl group as described herein.
- the aryl group(s) may be optionally substituted as described herein.
- Cycloalkyl refers to a stable monovalent monocyclic, bicyclic or tricyclic hydrocarbon group consisting solely of carbon and hydrogen atoms, having for example from 3 to 15 carbon atoms, and which is saturated and attached to the rest of the molecule by a single bond. Unless otherwise stated specifically herein, the term “cycloalkyl” is meant to include cycloalkyl groups which are optionally substituted as described herein.
- ring structure is meant a cycloalkyl, aryl, heteroaryl, or any cyclic structure that may be optionally substituted.
- Optional or “optionally” means that the subsequently described event of circumstances may or may not occur, and that the description includes instances where said event or circumstance occurs and instances in which it does not.
- optionally substituted alkyl means that the alkyl group may or may not be substituted and that the description includes both substituted alkyl groups and alkyl groups having no substitution. Examples of optionally substituted alkyl groups include, without limitation, methyl, ethyl, propyl, etc.
- optionally substituted alkyl and alkenyl groups include Ci -6 alkyls or alkenyls.
- Halo refers to bromo, chloro, fluoro, iodo, etc.
- suitable halogens include fluorine or chlorine.
- An amino group may also be substituted once or twice (to form a secondary or tertiary amine) with a group such as an optionally substituted alkyl group including Ci-ioalkyl (e.g., methyl, ethyl propyl etc.); an optionally substituted alkenyl group such as allyl, crotyl, 2-pentenyl, 3-hexenyl, etc., or an optionally substituted cycloalkyl group such as cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, etc.
- a group such as an optionally substituted alkyl group including Ci-ioalkyl (e.g., methyl, ethyl propyl etc.); an optionally substituted alkenyl
- C 1-6 alkyl, alkenyl and cycloalkyl are preferred.
- the amine group may also be optionally substituted with an aromatic or heterocyclic group, aralkyl (e.g., phenylCi -4 alkyl) or heteroalkyl for example, phenyl, pyridine, phenylmethyl (benzyl), phenethyl, pyridinylmethyl, pyridinylethyl, etc.
- the heterocyclic group may be a 5 or 6 membered ring containing 1 -4 heteroatoms.
- An amino group may be substituted with an optionally substituted C 2-4 alkanoyl, e.g., acetyl, propionyl, butyryl, isobutyryl etc., or a (e.g., methanesulfonyl, ethanesulfonyl, etc.) or a carbonyl or sulfonyl substituted aromatic or heterocyclic ring, e.g., benzenesulfonyl, benzoyl, pyridinesulfonyl, pyridinecarbonyl etc.
- the heterocycles are as described herein.
- optionally substituted carbonyl groups, or sulfonyl groups include optionally substituted forms of such groups formed from various hydrocarbyls such as alkyl, alkenyl and 5- to 6-membered monocyclic aromatic group (e.g., phenyl, pyridyl, etc.), as described herein.
- Therapeutic Indications include optionally substituted forms of such groups formed from various hydrocarbyls such as alkyl, alkenyl and 5- to 6-membered monocyclic aromatic group (e.g., phenyl, pyridyl, etc.), as described herein.
- the invention provides methods of treating conditions that are modulated, directly or indirectly, by an O-GlcNAcase enzyme or by O-GlcNAc-modified protein levels, for example, a condition that is benefited by inhibition of an O-GlcNAcase enzyme or by an elevation of O-GlcNAc-modified protein levels.
- Such conditions include, without limitation, tauopathies, such as Alzheimer's disease, neurodegenerative diseases, cardiovascular diseases, diseases associated with inflammation, diseases associated with immunosuppression and cancers.
- the compounds of the invention are also useful in the treatment of diseases or disorders related to deficiency or over-expression of O-GlcNAcase or accumulation or depletion of O-GlcNAc, or any disease or disorder responsive to glycosidase inhibition therapy.
- Such diseases and disorders include, but are not limited to, neurodegenerative disorders, such as Alzheimer's disease (AD), and cancer. Such diseases and disorders may also include diseases or disorders related to the accumulation or deficiency in the enzyme OGTase. Also included is a method of protecting or treating target cells expressing proteins that are modified by O-GlcNAc residues, the dysregulation of which modification results in disease or pathology.
- the term "treating" as used herein includes treatment, prevention, and amelioration.
- the invention provides methods of enhancing or elevating levels of protein O-GlcNAc modification in animal subjects, such as, veterinary and human subjects.
- This elevation of O-GlcNAc levels can be useful for the prevention or treatment of Alzheimer's disease; prevention or treatment of other neurodegenerative diseases (e.g. Parkinson's disease, Huntington's disease); providing neuroprotective effects; preventing damage to cardiac tissue; and treating diseases associated with inflammation or immunosuppression.
- neurodegenerative diseases e.g. Parkinson's disease, Huntington's disease
- the invention provides methods of selectively inhibiting an O-GlcNAcase enzyme in animal subjects, such as veterinary and human subjects.
- the invention provides methods of inhibiting phosphorylation of tau polypeptides, or inhibiting formation of NFTs, in animal subjects, such as, veterinary and human subjects. Accordingly, the compounds of the invention may be used to study and treat AD and other tauopathies.
- the methods of the invention are effected by administering a compound according to the invention to a subject in need thereof, or by contacting a cell or a sample with a compound according to the invention, for example, a pharmaceutical composition comprising a therapeutically effective amount of the compound according to Formula (I). More particularly, they are useful in the treatment of a disorder in which the regulation of O-GlcNAc protein modification is implicated, or any condition as described herein.
- Disease states of interest include Alzheimer's disease (AD) and related neurodegenerative tauopathies, in which abnormal hyperphosphorylation of the microtubule-associated protein tau is involved in disease pathogenesis.
- the compounds may be used to block hyperphosphorylation of tau by maintaining elevated levels of O-GlcNAc on tau, thereby providing therapeutic benefit.
- Tauopathies that may be treated with the compounds of the invention include: Alzheimer's disease, Amylotrophic lateral sclerosis (ALS), Amylotrophic lateral sclerosis with cognitive impairment (ALSci), Argyrophilic grain dementia, Bluit disease, Corticobasal degeneration (CBD), Dementia pugilistica, Diffuse neurofibrillary tangles with calcification, Down's syndrome, Familial British dementia, Familial Danish dementia, Frontotemporal dementia with parkinsonism linked to chromosome 17 (FTDP- 17), Gerstmann-Straussler-Scheinker disease, Guadeloupean parkinsonism, Hallevorden-Spatz disease (neurodegeneration with brain iron accumulation type 1), Multiple system atrophy, Myotonic dystrophy, Niemann-Pick disease (type C), Pallido-ponto-nigral degeneration, Parkinsonism-dementia complex of Guam, Pick's disease (PiD), Postencephalitic
- the compounds of this invention are also useful in the treatment of conditions associate with tissue damage or stress, stimulating cells, or promoting differentiation of cells. Accordingly, in some embodiments, the compounds of this invention may be used to provide therapeutic benefit in a variety of conditions or medical procedures involving stress in cardiac tissue, including but not limited to: ischemia; hemorrhage; hypovolemic shock; myocardial infarction; an interventional cardiology procedure; cardiac bypass surgery; fibrinolytic therapy; angioplasty; and stent placement.
- Compounds that selectively inhibit O-GlcNAcase activity may be used for the treatment of diseases that are associated with inflammation, including but not limited to, inflammatory or allergic diseases such as asthma, allergic rhinitis, hypersensitivity lung diseases, hypersensitivity pneumonitis, eosinophilic pneumonias, delayed-type hypersensitivity, atherosclerosis, interstitial lung disease (ILD) (e.g., idiopathic pulmonary fibrosis, or ILD associated with rheumatoid arthritis, systemic lupus erythematosus, ankylosing spondylitis, systemic sclerosis, Sjogren's syndrome, polymyositis or dermatomyositis); systemic anaphylaxis or hypersensitivity responses, drug allergies, insect sting allergies; autoimmune diseases, such as rheumatoid arthritis, psoriatic arthritis, multiple sclerosis, systemic lupus erythematosus, myastenia gravis,
- compounds that affects levels of protein O-GlcNAc modification may be used for the treatment of diseases associated with immunosuppression, such as in individuals undergoing chemotherapy, radiation therapy, enhanced wound healing and burn treatment, therapy for autoimmune disease or other drug therapy (e.g., corticosteroid therapy) or combination of conventional drugs used in the treatment of autoimmune diseases and graft/transplantation rejection, which causes immunosuppression; or immunosuppression due to congenital deficiency in receptor function or other causes.
- diseases associated with immunosuppression such as in individuals undergoing chemotherapy, radiation therapy, enhanced wound healing and burn treatment, therapy for autoimmune disease or other drug therapy (e.g., corticosteroid therapy) or combination of conventional drugs used in the treatment of autoimmune diseases and graft/transplantation rejection, which causes immunosuppression; or immunosuppression due to congenital deficiency in receptor function or other causes.
- the compounds of the invention may be useful for treatment of neurodegenerative diseases, including Parkinson's disease and Huntington's disease.
- Other conditions that may be treated are those triggered, affected, or in any other way correlated with levels of O- GIcNAc post-translational protein modification.
- the compounds of this invention may be useful for the treatment of such conditions and in particular, but not limited to, the following for which a association with O-GlcNAc levels on proteins has been established: graft rejection, in particular but not limited to solid organ transplants, such as heart, lung, liver, kidney, and pancreas transplants (e.g.
- kidney and lung allografts cancer, in particular but not limited to cancer of the breast, lung, prostate, pancreas, colon, rectum, bladder, kidney, ovary; as well as non-Hodgkin's lymphoma and melanoma; epilepsy, pain, or stroke, e.g., for neuroprotection following a stroke.
- compositions including compounds according to the invention, or for use according to the invention are contemplated as being within the scope of the invention.
- pharmaceutical compositions including an effective amount of a compound of Formula (I) are provided.
- the compounds of formula (I) and their pharmaceutically acceptable salts, stereoisomers, solvates, and derivatives are useful because they have pharmacological activity in animals, including humans.
- the compounds according to the invention are stable in plasma, when administered to a subject.
- compounds according to the invention, or for use according to the invention may be provided in combination with any other active agents or pharmaceutical compositions where such combined therapy is useful to modulate O- GlcNAcase activity, for example, to treat neurodegenerative, inflammatory, cardiovascular, or immunoregulatory diseases, or any condition described herein.
- compounds according to the invention, or for use according to the invention may be provided in combination with one or more agents useful in the prevention or treatment of Alzheimer's disease. Examples of such agents include, without limitation, • acetylcholine esterase inhibitors (AChEIs) such as Aricept® (Donepezil), Exelon®
- NMDA receptor antagonists such as Namenda® (Axura®, Akatinol®, Ebixa®, Memantine), Dimebon, SGS-742, Neramexane, Debio-9902 SR (ZT-I SR), etc.;
- gamma-secretase inhibitors and/or modulators such as FlurizanTM (Tarenflurbil, MPC-7869, R-flurbiprofen), LY450139, MK 0752, E2101, BMS-289948, BMS- 299897, BMS-433796, LY-411575, etc.;
- beta-secretase inhibitors such as ATG-Zl, etc.
- alpha-secretase activators such as NGX267, etc;
- amyloid- ⁇ aggregation and/or fibrillization inhibitors such as AlzhemedTM (3APS, Tramiprosate, 3-amino-l- ⁇ ro ⁇ anesulfonic acid), AL-108, AL-208, AZD-103, PBT2, Cereact, ONO-2506PO, PPI-558, etc.;
- tau aggregation inhibitors such as methylene blue, etc.
- microtubule stabilizers such as AL- 108, AL-208, paclitaxel, etc.
- RAGE inhibitors such as TTP488, etc.
- 5 -HTl a receptor antagonists such as Xaliproden, Lecozotan, etc.
- 5-HT4 receptor antagonists such as PRX-03410, etc.
- kinase inhibitors such as SRN-003-556, amfurindamide, LiCl, AZD1080, NP031112, SAR-502250, etc.
- humanized monoclonal anti-A ⁇ antibodies such as Bapineuzumab (AAB-001), LY2062430, RN1219, ACU-5A5, etc.;
- amyloid vaccines such as AN- 1792, ACC-001
- neuroprotective agents such as Cerebrolysin, AL-108, AL-208, Huperzine A, etc.
- L-type calcium channel antagonists such as MEM- 1003, etc.
- nicotinic receptor antagonists such as AZD3480, GTS-21, etc.
- nicotinic receptor agonists such as MEM 3454, Nefiracetam, etc.
- peroxisome proliferator-activated receptor (PPAR) gamma agonists such as Avandia® (Rosglitazone), etc.
- PDE4 inhibitors such as MK-0952, etc.
- hormone replacement therapy such as estrogen (Premarin), etc.
- monoamine oxidase (MAO) inhibitors such as NS2330, Rasagiline (Azilect®),
- AMPA receptor modulators such as Ampalex (CX 516), etc.
- nerve growth factors or NGF potentiators such as CERE-110 (AAV-NGF), T-588, T-817MA, etc; • agents that prevent the release of luteinizing hormone (LH) by the pituitary gland, such as leuoprolide (VP-4896), etc.;
- GABA receptor modulators such as AC-3933, NGD 97-1 , CP-457920, etc.;
- benzodiazepine receptor inverse agonists such as SB-737552 (S-8510), AC-3933, etc.; • noradrenaline-releasing agents such as T-588, T-817MA, etc.
- combination of compounds according to the invention, or for use according to the invention, with Alzheimer's agents is not limited to the examples described herein, but includes combination with any agent useful for the treatment of Alzheimer's disease.
- Combination of compounds according to the invention, or for use according to the invention, and other Alzheimer's agents may be administered separately or in conjunction.
- the administration of one agent may be prior to, concurrent to, or subsequent to the administration of other agent(s).
- the compounds may be supplied as "prodrugs" or protected forms, which release the compound after administration to a subject.
- the compound may carry a protective group which is split off by hydrolysis in body fluids, e.g., in the bloodstream, thus releasing the active compound or is oxidized or reduced in body fluids to release the compound.
- a “prodrug” is meant to indicate a compound that may be converted under physiological conditions or by solvolysis to a biologically active compound of the invention.
- the term “prodrug” refers to a metabolic precursor of a compound of the invention that is pharmaceutically acceptable.
- a prodrug may be inactive when administered to a subject in need thereof, but is converted in vivo to an active compound of the invention.
- Prodrugs are typically rapidly transformed in vivo to yield the parent compound of the invention, for example, by hydrolysis in blood.
- the prodrug compound often offers advantages of solubility, tissue compatibility or delayed release in a subject.
- prodrug is also meant to include any covalently bonded carriers which release the active compound of the invention in vivo when such prodrug is administered to a subj ect.
- Prodrugs of a compound of the invention may be prepared by modifying functional groups present in the compound of the invention in such a way that the modifications are cleaved, either in routine manipulation or in vivo, to the parent compound of the invention.
- Prodrugs include compounds of the invention wherein a hydroxy, amino or mercapto group is bonded to any group that, when the prodrug of the compound of the invention is administered to a mammalian subject, cleaves to form a free hydroxy, free amino or free mercapto group, respectively.
- Examples of prodrugs include, but are not limited to, acetate, formate and benzoate derivatives of alcohol and acetamide, formamide, andbenzamide derivatives of amine functional groups in the compounds of the invention and the like.
- Suitable prodrug forms of the compounds of the invention include embodiments in which R 1 is C(O)R and R 3 is OC(O)R, where R is optionally substituted alkyl, alkenyl, alkynyl, aryl, or heteroaryl. In these cases the ester groups may be hydrolyzed in vivo (e.g. in bodily fluids), releasing the active compounds in which R 1 is H and R 3 is OH.
- Preferred prodrug embodiments of the invention are the compounds of Formula (I) where R 1 is C(O)CH 3 and R 3 is OC(O)CH 3 .
- Compounds according to the invention, or for use according to the invention can be provided alone or in combination with other compounds in the presence of a liposome, an adjuvant, or any pharmaceutically acceptable carrier, diluent or excipient, in a form suitable for administration to a subject such as a mammal, for example, humans, cattle, sheep, etc. If desired, treatment with a compound according to the invention may be combined with more traditional and existing therapies for the therapeutic indications described herein.
- Compounds according to the invention may be provided chronically or intermittently. "Chronic" administration refers to administration of the compound(s) in a continuous mode as opposed to an acute mode, so as to maintain the initial therapeutic effect (activity) for an extended period of time.
- Intermittent administration is treatment that is not consecutively done without interruption, but rather is cyclic in nature.
- administration should be understood to mean providing a compound of the invention to the subject in need of treatment.
- “Pharmaceutically acceptable carrier, diluent or excipient” includes without limitation any adjuvant, carrier, excipient, glidant, sweetening agent, diluent, preservative, dye/colorant, flavor enhancer, surfactant, wetting agent, dispersing agent, suspending agent, stabilizer, isotonic agent, solvent, or emulsifier that has been approved, for example, by the United States Food and Drug Administration or other governmental agency as being acceptable for use in humans or domestic animals.
- compositions in accordance with this invention may comprise a salt of such a compound, preferably a physiologically acceptable salt, which are known in the art.
- pharmaceutically acceptable salt means an active ingredient comprising compounds of Formula 1 used in the form of a salt thereof, particularly where the salt form confers on the active ingredient improved pharmacokinetic properties as compared to the free form of the active ingredient or other previously disclosed salt form.
- a “pharmaceutically acceptable salt” includes both acid and base addition salts.
- a “pharmaceutically acceptable acid addition salt” refers to those salts which retain the biological effectiveness and properties of the free bases, which are not biologically or otherwise undesirable, and which are formed with inorganic acids such as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid and the like, and organic acids such as acetic acid, trifluoroacetic acid, propionic acid, glycolic acid, pyruvic acid, oxalic acid, maleic acid, malonic acid, succinic acid, fumaric acid, tartaric acid, citric acid, benzoic acid, cinnamic acid, mandelic acid, methanesulfonic acid, ethanesulfonic acid, p-toluenesulfonic acid, salicylic acid, and the like.
- a "pharmaceutically acceptable base addition salt” refers to those salts which retain the biological effectiveness and properties of the free acids, which are not biologically or otherwise undesirable. These salts are prepared from addition of an inorganic base or an organic base to the free acid. Salts derived from inorganic bases include, but are not limited to, the sodium, potassium, lithium, ammonium, calcium, magnesium, iron, zinc, copper, manganese, aluminum salts and the like. Preferred inorganic salts are the ammonium, sodium, potassium, calcium, and magnesium salts.
- Salts derived from organic bases include, but are not limited to, salts of primary, secondary, and tertiary amines, substituted amines including naturally occurring substituted amines, cyclic amines and basic ion exchange resins, such as isopropylamine, trimethylamine, diethylamine, triethylamine, tripropylamine, ethanolamine, 2-dimethylaminoethanol, 2-diethylaminoethanol, dicyclohexylamine, lysine, arginine, histidine, caffeine, procaine, hydrabamine, choline, betaine, ethylenediamine, glucosamine,methylglucamine, theobromine, purines, piperazine, piperidine, N-ethylpiperidine, polyamine resins and the like.
- Particularly preferred organic bases are isopropylamine, diethylamine, ethanolamine, trimethylamine, dicyclohexylamine, choline and caffeine.
- the term "pharmaceutically acceptable salt” encompasses all acceptable salts including but not limited to acetate, lactobionate, benzenesulfonate, laurate, benzoate, malate, bicarbonate, maleate, bisulfate, mandelate, bitartarate, mesylate, borate, methylbromide, bromide, methylnitrite, calcium edetate, methylsulfate, camsylate, mucate, carbonate, napsylate, chloride, nitrate, clavulanate, N-methylglucamine, citrate, ammonium salt, dihydrochloride, oleate, edetate, oxalate, edisylate, pamoate (embonate), estolate, palmitate, esylate, pantothenate, fumarate, phosphate/diphosphate, gluceptate, polygalacturonate, gluconate, salicylate, glut
- Pharmaceutically acceptable salts of the compounds of the present invention can be used as a dosage for modifying solubility or hydrolysis characteristics, or can be used in sustained release or prodrug formulations.
- pharmaceutically acceptable salts of the compounds of this invention may include those formed from cations such as sodium, potassium, aluminum, calcium, lithium, magnesium, zinc, and from bases such as ammonia, ethylenediamine, N-methyl-glutamine, lysine, arginine, ornithine, choline, N,N'-dibenzylethylene-diamine, chloroprocaine, diethanolamine, procaine, N-benzylphenethyl-amine, diethylamine, piperazine, tris(hydroxymethyl)aminomethane, and tetramethylammonium hydroxide.
- compositions will typically include one or more carriers acceptable for the mode of administration of the preparation, be it by injection, inhalation, topical administration, lavage, or other modes suitable for the selected treatment.
- Suitable carriers are those known in the art for use in such modes of administration.
- Suitable pharmaceutical compositions may be formulated by means known in the art and their mode of administration and dose determined by the skilled practitioner.
- a compound may be dissolved in sterile water or saline or a pharmaceutically acceptable vehicle used for administration of non- water soluble compounds such as those used for vitamin K.
- the compound may be administered in a tablet, capsule or dissolved in liquid form.
- the table or capsule may be enteric coated, or in a formulation for sustained release.
- Many suitable formulations are known, including, polymeric or protein microparticles encapsulating a compound to be released, ointments, gels, hydrogels, or solutions which can be used topically or locally to administer a compound.
- a sustained release patch or implant may be employed to provide release over a prolonged period of time.
- Many techniques known to skilled practitioners are described in Remington: the Science & Practice of Pharmacy by Alfonso Gennaro, 20 th ed., Williams & Wilkins, (2000).
- Formulations for parenteral administration may, for example, contain excipients, polyalkylene glycols such as polyethylene glycol, oils of vegetable origin, or hydrogenated naphthalenes.
- Biocompatible, biodegradable lactide polymer, lactide/glycolide copolymer, or polyoxyethylene-polyoxypropylene copolymers may be used to control the release of the compounds.
- parenteral delivery systems for modulatory compounds include ethylene- vinyl acetate copolymer particles, osmotic pumps, implantable infusion systems, and liposomes.
- Formulations for inhalation may contain excipients, for example, lactose, or may be aqueous solutions containing, for example, polyoxyethylene-9-lauryl ether, glycocholate and deoxycholate, or may be oily solutions for administration in the form of nasal drops, or as a gel.
- the compounds or pharmaceutical compositions according to the present invention may be administered by oral or non-oral, e.g., intramuscular, intraperitoneal, intravenous, intracisternal injection or infusion, subcutaneous injection, transdermal or transmucosal routes.
- compounds or pharmaceutical compositions in accordance with this invention or for use in this invention may be administered by means of a medical device or appliance such as an implant, graft, prosthesis, stent, etc.
- Implants may be devised which are intended to contain and release such compounds or compositions.
- An example would be an implant made of a polymeric material adapted to release the compound over a period of time.
- the compounds may be administered alone or as a mixture with a pharmaceutically acceptable carrier e.g., as solid formulations such as tablets, capsules, granules, powders, etc.; liquid formulations such as syrups, injections, etc.; injections, drops, suppositories, pessaryies.
- compounds or pharmaceutical compositions in accordance with this invention or for use in this invention may be administered by inhalation spray, nasal, vaginal, rectal, sublingual, or topical routes and may be formulated, alone or together, in suitable dosage unit formulations containing conventional non-toxic pharmaceutically acceptable carriers, adjuvants and vehicles appropriate for each route of administration.
- the compounds of the invention may be used to treat animals, including mice, rats, horses, cattle, sheep, dogs, cats, and monkeys. However, compounds of the invention can also be used in other organisms, such as avian species (e.g., chickens). The compounds of the invention may also be effective for use in humans.
- the term "subject” or alternatively referred to herein as "patient” is intended to be referred to an animal, preferably a mammal, most preferably a human, who has been the object of treatment, observation or experiment. However, the compounds, methods and pharmaceutical compositions of the present invention may be used in the treatment of animals.
- a "subject” may be a human, non-human primate, rat, mouse, cow, horse, pig, sheep, goat, dog, cat, etc. The subject may be suspected of having or at risk for having a condition requiring modulation of O-GlcNAcase activity.
- An "effective amount" of a compound according to the invention includes a therapeutically effective amount or a prophylactically effective amount.
- a “therapeutically effective amount” refers to an amount effective, at dosages and for periods of time necessary, to achieve the desired therapeutic result, such as inhibition of an O-GlcNAcase, elevation of O-GlcNAc levels, inhibition of tau phosphorylation, or any condition described herein.
- a therapeutically effective amount of a compound may vary according to factors such as the disease state, age, sex, and weight of the individual, and the ability of the compound to elicit a desired response in the individual. Dosage regimens may be adjusted to provide the optimum therapeutic response. A therapeutically effective amount is also one in which any toxic or detrimental effects of the compound are outweighed by the therapeutically beneficial effects.
- a “prophylactically effective amount” refers to an amount effective, at dosages and for periods of time necessary, to achieve the desired prophylactic result, such as inhibition of an O-GlcNAcase, elevation of O-GlcNAc levels, inhibition of tau phosphorylation, or any condition described herein.
- a prophylactic dose is used in subjects prior to or at an earlier stage of disease, so that a prophylactically effective amount may be less than a therapeutically effective amount.
- a suitable range for therapeutically or prophylactically effective amounts of a compound may be any integer from 0.1 nM-0.1M, 0.1 nM-0.05M, 0.05 nM-15 ⁇ M or 0.01 nM-10 ⁇ M.
- an appropriate dosage level will generally be about 0.01 to 500 mg per kg subject body weight per day, and can be administered in singe or multiple doses. In some embodiments, the dosage level will be about 0.1 to about 250 mg/kg per day.
- dosage levels and frequency of dosage for any particular patient may be varied and will depend upon a variety of factors including the activity of the specific compound used, the metabolic stability and length of action of that compound, the age, body weight, general health, sex, diet, mode and time of administration, rate of excretion, drug combination, the severity of the particular condition, and the patient undergoing therapy.
- dosage values may vary with the severity of the condition to be alleviated.
- specific dosage regimens may be adjusted over time according to the individual need and the professional judgement of the person administering or supervising the administration of the compositions. Dosage ranges set forth herein are exemplary only and do not limit the dosage ranges that may be selected by medical practitioners.
- the amount of active compound(s) in the composition may vary according to factors such as the disease state, age, sex, and weight of the subject. Dosage regimens may be adjusted to provide the optimum therapeutic response. For example, a single bolus may be administered, several divided doses may be administered over time or the dose may be proportionally reduced or increased as indicated by the exigencies of the therapeutic situation. It may be advantageous to formulate parenteral compositions in dosage unit form for ease of administration and uniformity of dosage. In general, compounds of the invention should be used without causing substantial toxicity, and as described herein, the compounds exhibit a suitable safety profile for therapeutic use.
- Toxicity of the compounds of the invention can be determined using standard techniques, for example, by testing in cell cultures or experimental animals and determining the therapeutic index, i.e., the ratio between the LD50 (the dose lethal to 50% of the population) and the LDlOO (the dose lethal to 100% of the population). In some circumstances however, such as in severe disease conditions, it may be necessary to administer substantial excesses of the compositions.
- a compound of Formula (I) may be used in screening assays for compounds which modulate the activity of glycosidase enzymes, preferably the O-GlcNAcase enzyme.
- the ability of a test compound to inhibit O-GlcNAcase-dependent cleavage of O-GlcNAc from a model substrate may be measured using any assays, as described herein or known to one of ordinary skill in the art. For example, a fluoresence or UV-based assay known in the art may be used.
- a "test compound” is any naturally-occurring or artificially-derived chemical compound. Test compounds may include, without limitation, peptides, polypeptides, synthesised organic molecules, naturally occurring organic molecules, and nucleic acid molecules.
- a test compound can "compete" with a known compound such as a compound of Formula (I) by, for example, interfering with inhibition of O-GlcNAcase-dependent cleavage of O-GlcNAc or by interfering with any biological response induced by a compound of Formula (I).
- a test compound can exhibit any value between 10% and 200%, or over 500%, modulation when compared to a compound of Formula (I) or other reference compound.
- a test compound may exhibit at least any positive or negative integer from 10% to 200% modulation, or at least any positive or negative integer from 30% to 150% modulation, or at least any positive or negative integer from 60% to 100% modulation, or any positive or negative integer over 100% modulation.
- a compound that is a negative modulator will in general decrease modulation relative to a known compound, while a compound that is a positive modulator will in general increase modulation relative to a known compound.
- test compounds are identified from large libraries of both natural products or synthetic (or semi-synthetic) extracts or chemical libraries according to methods known in the art.
- test extracts or compounds are not critical to the method(s) of the invention. Accordingly, virtually any number of chemical extracts or compounds can be screened using the exemplary methods described herein. Examples of such extracts or compounds include, but are not limited to, plant-, fungal-, prokaryotic- or animal-based extracts, fermentation broths, and synthetic compounds, as well as modification of existing compounds.
- Synthetic compound libraries are commercially available.
- libraries of natural compounds in the form of bacterial, fungal, plant, and animal extracts are commercially available from a number of sources, including Biotics (Sussex, UK), Xenova (Slough, UK), Harbor Branch Oceanographic Institute (Ft. Pierce, FL, USA), and PharmaMar, MA, USA.
- Biotics Sussex, UK
- Xenova Slough, UK
- Harbor Branch Oceanographic Institute Ft. Pierce, FL, USA
- PharmaMar, MA PharmaMar, USA.
- natural and synthetically produced libraries are produced, if desired, according to methods known in the art, e.g., by standard extraction and fractionation methods.
- any library or compound is readily modified using standard chemical, physical, or biochemical methods.
- compounds shown to be useful agents for treatment are chemically modified according to methods known in the art.
- Compounds identified as being of therapeutic, prophylactic, diagnostic, or other value may be subsequently analyzed using a suitable animal model, as described herein on known in the art.
- the compounds are useful in the development of animal models for studying diseases or disorders related to deficiencies in O-GlcNAcase, over- expression of O-GlcNAcase, accumulation of O-GlcNAc, depletion of O-GlcNAc, and for studying treatment of diseases and disorders related to deficiency or over-expression of O- GlcNAcase, or accumulation or depletion of O-GlcNAc.
- diseases and disorders include neurodegenerative diseases, including Alzheimer's disease, and cancer.
- Triethylamine (0.8 mL) and dry pyridine (20 mL) were added to a cooled (0 0 C) solution of 2-amino-2-deoxy-l,3,4,6-tefra-0-acetyl- ⁇ -D-glucopyranose hydrochloride (1 g) in a solution of DMF (100 mL).
- Sodium fluoroacetate (1.8 g) was added to a stirred mixture of dry DMF (90 mL) containing dried Dowex 50-H + resin (12 g). After 1 h, DCC (3.2 g) and 30 mL of the fluoroacetic acid solution were added via cannula to the reaction vessel containing the hydrochloride salt.
- Example 2 Compounds 3 and 4: (3aR.5R.6S.7R.7aRV5-(acetoxymethylV2-(difluoromethylV5.6.7.7a- tetrahvdro-3aH-pyranor3.2-dlthiazole-6.7-diyl diacetate (3) and (3aR.5R.6S.7R.7aRV2- (difluoromethylV5-(hvdroxymethyl)-5.6.7.7a-tetrahvdro-3aH-pyranor3,2-dlthiazole-6.7-diol (4)
- Triethylamine (0.8 mL) and dry pyridine (20 mL) were added to a cooled (0 0 C) solution of 2-amino-2-deoxy-l,3,4,6-tetra-O-acetyl- ⁇ -D-glucopyranose hydrochloride (1 g) in a solution of DMF (100 mL).
- Dicyclohexylcarbodiimide (DCC, 3 g) and difluoroacetic acid (1.2 mL) were added to the reaction mixture via syringe. The resulting solution was allowed to stand for 16 h at 0 0 C, after which time another 0.5 mL of difluoroacetic acid were added.
- Example 3 Compounds 5 and 6: (3aR.5R.6S JRJaRV5-(acetoxymethylV2-ftrifluoromethylV5.6.7.7a- tetrahvdro-3aH-pyranor3.2-dlthiazole-6.7-diyl diacetate (5) and (3aR.5R.6S.7R.7aR)-5- rhvdroxymethyl)-2-(trifluoromethyl)-5.6,7Ja-tetrahvdro-3aH-pyranor3.2-d1thiazole-6.7-diol (6)
- Triethylamine (0.8 mL) was added to a solution of 2-amino-2-deoxy-l,3,4,6-tetra-O- acetyl- ⁇ -D-glucopyranose hydrochloride (1 g) dissolved in dry dichloromethane (20 mL) and cooled (0 0 C). Trifluoroacetic anhydride (0.6 mL) was added via syringe and the resulting solution was allowed to stand for 16 h at 0 0 C, after which time the reaction was judged complete by TLC analysis.
- the solution was diluted in 50 mL of EtOAc and washed successively with water, twice with saturated aqueous NaHCO 3 , and finally with a solution of brine.
- the organic extracts were dried over MgSO 4 and filtered, and the solvent was removed in vacuo to yield colorless syrup.
- the desired product was purified using flash chromatography on silica gel (4: 1 ; hexanes/EtOAc) to yield the partially purified amide that was used in the next step without further purification.
- Example 6 Compounds 11 and 12: r3aR.5R.6S.7R.7aRV5-racetoxymethylV2-(methoxymethylV5.6.7.7a- tetrahvdro-3aH-pyrano[3.2-dlthiazole-6.7-diyl diacetate (11) and f3aR,5R.6S.7R.7aRV5- (hvdroxymethyl ' )-2-toethoxymethvD-5.6.7.7a-tetrahvdro-3aH-pyranor3.2-dlthia2 ⁇ le-6.7-diol (12)
- the concentrated mixture was purified via flash column chromatography in a solvent system of EtOAc and hexanes (1:1), providing (2S,3R,4R,5S,6R)-6-(acetoxymethyl)-3-(3-(2-fluoroethyl)thioureido)-tetrahydro-2H-pyran-2,4,5- triyl triacetate (0.358 g, 57% yield).
- the crude material was purified via flash column chromatography with a solvent system of 5:1 DCM and MeOH, providing (5R,6S,7R)-2-(2-fluoroethylamino)-5-(hydroxymethyl)-5,6,7,7a-tetrahydro-3aH- pyrano[3,2-d]thiazole-6,7-diol (35) (0.045 g, 90% yield).
- the aqueous layer was then extracted three times with DCM, and the organic layers were combined, dried with MgSO 4 , filtered and concentrated.
- the concentrated mixture was purified via flash column chromatography in a solvent system of EtOAc and hexanes (1 :1, 2:1.
- the final reaction mixture was purified via flash column chromatography with a solvent system of 5:1 DCM and MeOH, providing (5R,6S,7R)-5-(hydroxymethyl)-2-(2,2,2-trifluoroethylamino)-5,6,7,7a- tetrahydro-3aH-pyrano[3,2-d]thiazole-6,7-diol (39) (0.110 g, 47% yield).
- Example 22 Compounds 42 and 43: (3aR.5R.6S.7R.7aRV5-(acetoxymethylV2-(dimethylaminoV5.6.7.7a- tetrahvdro-3aH-pyranor3.2-dlthiazole-6.7-diyl diacetate (42) and (3aR.5R.6S.7R.7aRV2- (dimethylamino)-5-(hvdroxymethyl ' )-5,6,7,7a-tetrahvdro-3aH-pyranor3,2-d1thiazole-6,7-diol (43)
- the concentrated mixture was purified via flash column chromatography (EtOAc:hexanes, 1 :1) to provide (5R,6S,7R)- 5-(acetoxyrnethyl)-2-(dimethylamino)-5,6,7,7a- tetrahydro-3aH-pyrano[3,2-d]thiazole-6,7-diyl diacetate (42) (0.19 g, 42% yield).
- the final reaction mixture was purified via flash column chromatography with a solvent system of 5: 1 DCM and MeOH, providing (5R,6S,7R)-2-(dimethylamino)-5-(hydroxymethyl)-5,6,7,7a-tetrahydro-3aH- pyrano[3,2-d]thiazole-6,7-diol (43) (0.092 g, 75% yield).
- Example 23 Compounds 44 and 45: (3aR.5R.6S.7R.7aR)-5-facetoxymethyl)-2-(ethylCmethyl)amino)-5.6.7.7a- tetrahvdro-3aH-pyrano[3.2-d " lthiazole-6.7-diyl diacetate (44) and (3aR.5R.6S.7R.7aR1-2- (ethyl(methyl)amino)-5-(hvdroxymethyl)-5,6.7,7a-tetrahvdro-3aH-pyrano[3,2-dlthiazole-6.7-diol
- Example 24 Compounds 46 and 47: (3aR.5R.6S JRJaRV5-(acetoxymethylV2-(methoxyaminoV5.6.7.7a- tetrahvdro-3aH-pyranor3.2-dlthiazole-6.7-diyl diacetate (46) and (3aR.5R.6S.7R.7aRV5- (hvdroxymethyl)-2-(methoxyaminoV5.6.7.7a-tetrahydro-3aH-pyrano[3.2-d1thiazole-6.7-diol ('47)
- K 1 values for inhibition of O-GlcNAcase in the range 1 nM - 50 ⁇ M.
- the K 1 values for inhibition of O-GlcNAcase shown in Table 4 were obtained for compounds 2, 4, and 6. All K ⁇ values were determined using linear regression ofa Dixon plots.
- ⁇ -hexosaminidase was used at a concentration of 0.036 mg/mL withpNP-GlcNAc as a substrate at a concentration of 0.5 mM.
- the inhibitor was tested at five concentrations ranging from 5 times to 1/5 K ⁇ .
- K ⁇ values were determined by linear regression of data from Dixon plots.
- Ki ⁇ -hexosaminidase/Ki (O-GlcNAcase)
- the compounds described in the Examples herein exhibit a selectivity ratio in the range of about 1000 to 100000.
- many of the compounds described in the Examples herein exhibit greater selectivity towards O-GlcNAcase.
- the compounds of the invention show exhibit high selectivity for inhibition of O-GlcNAcase over ⁇ -hexosaminidase.
- Example 29 Dose-dependent elevation of rat brain and muscle O-GlcNAc levels [00190]
- IV intravenous
- NAG-Bt 3aR,5R,6S,7R,7aR-5- (hydroxymethyl)-2-propyl-5,6,7,7a-tetrahydro-3aH-pyrano[3,2-d]thiazole-6,7-diol
- mice were given one week to acclimatize and at six weeks of age the appropriate treatment was initiated. Eight animals were given intravenous tail vein injections of various concentrations of NAG- Bt or vehicle alone (PBS); doses of NAG-Bt included 0, 2, 5, 10, 25, 50, 100, and 250 mg/kg. Seven hours later animals were sacrificed and tissues were removed from animals as quickly as possible to minimize post-mortem delay. Tissues were immediately frozen in liquid nitrogen and stored at -8O 0 C until further use.
- PBS vehicle alone
- tissue homogenization of the tissues was carried out by manual grinding followed by homogenization in cell lysis buffer (50 mM Tris, pH 8.0, 1 mM PMSF, 0.1% NP-40, 1 mM NAG-Bt) using a tissue homogenizer (IKA) at 4 0 C. Insoluble cell debris was removed by centrifugation at 17,900 x g for 20 minutes at 4°C and the resulting supernatant was stored at -20 0 C until use.
- cell lysis buffer 50 mM Tris, pH 8.0, 1 mM PMSF, 0.1% NP-40, 1 mM NAG-Bt
- IKA tissue homogenizer
- Figures 1C and ID are Western blots of samples loaded in the upper panels ( Figures IA and IB) probed using anti- ⁇ -actin mAb clone AC-40 followed by an anti-mouse IgG-HRP conjugate, and reveal equivalent sample loading.
- Analysis of the Western blot results by densitometry ( Figures IE-F) reveals a more pronounced effect in brain tissue at the 250 mg/kg dose (roughly 25-fold elevation of O- GIcNAc levels over baseline) as compared to the effect in muscle tissue (roughly 10-fold elevation of O-GlcNAc levels over baseline).
- Example 30 Decrease of rat brain tau phosphorylation levels
- Equal amounts of homogenized brain tissue from an animal treated with and without NAG-Bt were separated by SDS-PAGE followed by probing with each of the primary antibodies and an appropriate secondary antibody (either an anti-mouse or anti-rabbit IgG-HRP conjugate, as appropriate).
- the resulting Western blots are shown in Figures 2A-I, and reveal decreases of brain tau phosphorylation at multiple sites following treatment with NAG-Bt; lanes labeled "+” indicate samples from animals receiving NAG-Bt, while lanes labeled "-" indicate samples from animals receiving vehicle alone.
- Treated animals exhibit decreases in phosphorylation at the Tau-1 epitope (including Serl95, Serl98, Serl99, and Ser202), Serl99, Ser262, Ser396, Ser422, and Thr231; brain lysates probed using the Tau-5 primary antibody show equivalent sample loading.
- Treatment with NAG-Bt increases phosphorylation at Ser214 and Ser404, a result consistent with observations made in cultured cells using a non-selective O-GlcNAcase inhibitor.
- Dosing with NAG-Bt essentially blocks phosphorylation of two critically important sites (Thr231 and Ser396) involved in the toxic self-assembly of tau. 116 ' 117
- These data demonstrate that oral administration of NAG-Bt has the overall effect of reducing tau phosphorylation levels in the brain.
- Example 31 Elevation of rat cardiac O-GlcNAc levels
- Figure 3B shows a Western blot of samples loaded in the upper panel (Figure 3A) probed using an anti- ⁇ -actin mAb clone AC-40 followed by an anti-mouse IgG-HRP conjugate, and reveals equivalent sample loading.
- mice Animal dosing and tissue collection. Hemizygous transgenic female JNPL3 mice overexpressing human mutant tau protein (P301L) and wild type control mice were obtained from Taconic Farms, Inc. (model numbers 001638-T-F and 001638-W-F, respectively). The mice were 10-12 weeks of age at delivery, designated "week 1" of the study.
- mice were split into four groups: Group A (transgenic mice) received vehicle alone throughout the study; Group B (transgenic mice) received 100 mg/kg/day NAG-Bt in their food from week 1 to week 15, then were switched to 1000 mg/kg/day NAG-Bt in their drinking water from week 16 to week 32; Group D (transgenic mice) received vehicle alone from weeks 1 to 15, and then 500 mg/kg/day NAG-AE in their drinking water from weeks 16 to 32; Group E (wild-type) received vehicle alone throughout the study. In week 32, three animals per group were sacrificed and tissues were collected. Transgenic mice and controls were sacrificed using a CO 2 chamber.
- Cryostat sectioning The brains were then mounted with optimal cutting temperature (OCT) medium (Tissue Tek) and sectioned sagittally on a Reichert-Jung Cryocut 1800 (Leica) using Feather microtome blades (Tissue Tek) at 50 ⁇ m and placed in IX PBS for further processing.
- OCT optimal cutting temperature
- the cryostat temperature was set at -17 0 C to -19°C.
- Imaging Sections were visualized using a Leica fluorescent microscope (DM4000B). A filter set (excitation peak: 480 ran, emission peak: 520 ran, Leica) was used for O-GlcNAc/FITC imaging and another filter set (excitation filter: 530-550 ran, emission filter: 570 nm, Leica) was used for phospho-Tau-ser404/Cy3 imaging. 10x Images from the hippocampus regions of brains were acquired using a Spot digital camera (Diagnostic Instruments, Sterling Heights, MI, USA). and processed with LAS (Leica Application Suite) software. [00200] The images of hippocampal brain sections from representative mice in each group are shown in Figures 4A-H.
- the images on the right-hand side are sections stained with anti-OGlcNAc antibody, and light areas correspond to regions with high levels of protein O-GlcNAc modification.
- the images on the left-hand side are sections stained with anti-phospho Tau-Ser404 antibody, and light areas correspond to regions with high levels of phosphorylated tau protein; in particular, the bright dots correspond to aggregates of hyperphosphorylated tau protein, or neurofibrillary tangles (NFTs).
- NFTs neurofibrillary tangles
- Table 5 shows results from hematology (CBC) and serum chemistry tests on rats dosed orally with NAG-Bt for 4 months at 100 mg/kg/day versus controls
- Table 6 shows results from urinalysis tests on rats dosed orally with NAG-Bt for 4 months at 100 mg/kg/day versus controls
- Example 34 Decrease of rat brain tau phosphorylation levels
- Membranes were then extensively washed with PBS- T, blocked again for 30 min with 1 % BSA in PBS-T at RT and then probed with the appropriate HRP conjugated secondary antibody for 1 h at RT delivered in 1 % BSA in PBS-T. Finally, the membranes were washed extensively and then developed with
- Mouse monoclonal ⁇ -Tau-5 which recognizes the central region of tau in a phosphorylation state independent manner was purchased from Lab Vision Corporation and used at a dilution of 1:500.
- Rabbit polyclonal ⁇ -Tau [ ⁇ S 231 ], ⁇ -Tau [pT 396 ], and ⁇ -Tau [pS 422 ] recognize phosphorylated Thr-231, Ser-396, and Ser-422 respectively, and were purchased from Biosource International and used at a dilution of 1 : 1000.
- Mouse monoclonal ⁇ -O-GlcNAc (CTDl 10.6) which recognizes the O-GlcNAc monosaccharide modification was purchased from Covance and used at a dilution of 1 :2500.
- Mouse monoclonal ⁇ -actin (clone AC-40) was purchased from Sigma and was used at a dilution of 1:1000.
- mice were split into three groups: Group E received vehicle alone throughout the study; Group Fl received 100 mg/kg/day NAG-Bt in their food from week 1 to week 15, then were switched to 500 mg/kg/day NAG-AE in their drinking water from week 16 to week 40; Group F2 received 100 mg/kg/day NAG-Bt in their food from week 1 to week 15 then were switched to 1000 mg/kg/day NAG-Bt in their drinking water from week 16 to week 40. During this time, body weight, food consumption, and water consumption were monitored for animals in each group; no significant differences were noted between groups.
- Table 7 shows results from hematology (CBC) and serum chemistry tests on mice dosed orally with NAG-Bt or NAG-AE for nine months versus controls
- Table 8 shows results from urinalysis tests on mice dosed orally with NAG-Bt or NAG-AE for nine months versus controls
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AU2007291870A AU2007291870B2 (en) | 2006-08-31 | 2007-08-31 | Selective glycosidase inhibitors and uses thereof |
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US20100016386A1 (en) | 2010-01-21 |
CA2661582C (en) | 2015-09-29 |
EP2057171A1 (en) | 2009-05-13 |
JP5771237B2 (en) | 2015-08-26 |
EP2322529B1 (en) | 2017-12-06 |
US8962664B2 (en) | 2015-02-24 |
EP2057171A4 (en) | 2010-04-21 |
CA2661582A1 (en) | 2008-03-06 |
WO2008025170B1 (en) | 2008-04-24 |
AU2007291870B2 (en) | 2012-12-06 |
JP5380293B2 (en) | 2014-01-08 |
US8334310B2 (en) | 2012-12-18 |
EP2322529A1 (en) | 2011-05-18 |
JP2010501598A (en) | 2010-01-21 |
US20120316207A1 (en) | 2012-12-13 |
AU2007291870A1 (en) | 2008-03-06 |
JP2013213037A (en) | 2013-10-17 |
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