WO2019079755A1 - Methods and materials for nt-3 gene therapy - Google Patents
Methods and materials for nt-3 gene therapy Download PDFInfo
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- WO2019079755A1 WO2019079755A1 PCT/US2018/056765 US2018056765W WO2019079755A1 WO 2019079755 A1 WO2019079755 A1 WO 2019079755A1 US 2018056765 W US2018056765 W US 2018056765W WO 2019079755 A1 WO2019079755 A1 WO 2019079755A1
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- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
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Definitions
- the present disclosure relates to recombinant adeno-associated virus (rAAV) delivery of a neurotrophin 3 (NT-3) polynucleotide.
- rAAV adeno-associated virus
- the disclosure provides rAAV and methods of using the rAAV for NT-3 gene therapy to improve muscle strength, stimulate muscle growth and to treat neuropathies and muscle wasting disorders, such as Charcot-Marie-Tooth neuropathy.
- NT-3 neurotrophin 3
- SCs peripheral nerve regeneration and Schwan cells
- CMT Charcot-Marie-Tooth
- CMT1 includes five types of CMT that are caused by four genes when mutated. This group includes the majority of people with CMT. These genes are associated with SCs and the myelin sheath surrounding the axon, although they interact in different ways and thus are pheno typically heterogeneous.
- CMT type 1A is the result of a DNA duplication on chromosome 17pl l encompassing PMP22 gene which leads to development of the classic CMT1 phenotype.
- Patients develop clinical signs in the first two decades of life causing significant disabilities requiring ambulatory aids. In these patients, peripheral nerve regeneration is incomplete due to prolonged axotomy and denervation which occurs as part of the chronic neuropathy.
- NT-3 is a trophic factor secreted by Schwann cells (SCs) that supports nerve regeneration.
- SCs Schwann cells
- the ability of denervated SCs to survive is crucial for nerve regeneration as SCs provide both growth factors and basal lamina, scaffoldings that promote axonal growth. Prolonged denervation leads to a decreased regenerative capacity related to reduced expression of regeneration-associated SC molecules (neurotrophic factors (NTFs) and their receptors) resulting in atrophy of the denervated SCs, breakdown of the bands of Bungner, and loss of SC basal lamina scaffoldings.
- NNFs neurotrophic factors
- TrJ TremblerJ
- CMT Charcot-Marie-Tooth
- CMT1A inherited as an autosomal dominant condition, is the most common type of CMT. Most often it is caused by a 1.5 Mb duplication at 17pl 1.2 including the peripheral myelin protein 22 (PMP22) gene, created by unequal crossing over of homologous chromosomes (1). This is a slowly progressive disease without known treatment. Symptoms most often start in the first two decades. Pes cavus and hammer toes are present. Ambulatory aids such as ankle foot orthoses are required. Less frequently, severe childhood cases may be wheelchair or ventilator-dependent. Typically, 90% of patients have motor nerve conduction velocity (NCV) in the ulnar nerve between 16 and 35 m/s or less (2).
- NCV motor nerve conduction velocity
- the clinical electrophysiological picture is a length-dependent sensorimotor demyelinating neuropathy.
- the clinical picture is significantly influenced by axonal degeneration resulting from impaired Schwann cell (SC)-axon interactions (3).
- musculoskeletal diseases have been shown to lead to a decrease in muscle strength. These include, but are not limited to, inherited or recessive myopathies (such as muscular dystrophies), muscle-wasting diseases (such as cachexia that may be the result from underlying illnesses such as acquired immunodeficiency diseases (AIDS), rheumatoid arthritis, cancer, chronic obstructive pulmonary disease (COPD), and cirrhosis), conditions of muscle atrophy or attenuation (such as sarcopenia that may be the result of aging), protracted disuse (such as paralysis, coma, extended bed rest, and ICU stay), weakness induced by surgery (such as joint replacement surgery), drug-induced myopathy and rhabdomyolysis.
- AIDS acquired immunodeficiency diseases
- COPD chronic obstructive pulmonary disease
- cirrhosis conditions of muscle atrophy or attenuation
- protracted disuse such as paralysis, coma, extended bed rest, and ICU stay
- Muscle pathology of these diseases and conditions are mediated, in part or in whole, by a combination of immune, inflammatory, and fibrotic responses.
- Agents capable of blocking these responses and/or stimulating regeneration of the damaged tissue would be capable of slowing or reversing disease progression in these disorders.
- Adeno-associated virus is a replication-deficient parvovirus, the single-stranded DNA genome of which is about 4.7 kb in length including 145 nucleotide inverted terminal repeat (ITRs).
- ITRs nucleotide inverted terminal repeat
- AAV-1 is provided in GenBank Accession No. NC_002077
- AAV-2 is provided in GenBank Accession No. NC_001401 and Srivastava et al., J. Virol., 45: 555-564 ⁇ 1983
- the complete genome of AAV-3 is provided in GenBank Accession No.
- NC_1829 the complete genome of AAV-4 is provided in GenBank Accession No. NC_001829; the AAV-5 genome is provided in GenBank Accession No. AF085716; the complete genome of AAV-6 is provided in GenBank Accession No. NC_00 1862; at least portions of AAV-7 and AAV-8 genomes are provided in GenBank Accession Nos. AX753246 and AX753249, respectively; the AAV -9 genome is provided in Gao et al., J. Virol., 78: 6381-6388 (2004); the AAV-10 genome is provided in Mol. Ther., 13(1): 67-76 (2006); and the AAV-11 genome is provided in Virology, 330(2): 375-383 (2004).
- Cis-acting sequences directing viral DNA replication (rep), encapsidation/packaging and host cell chromosome integration are contained within the AAV ITRs.
- Three AAV promoters (named p5, pl9, and p40 for their relative map locations) drive the expression of the two AAV internal open reading frames encoding rep and cap genes.
- the two rep promoters (p5 and pl9), coupled with the differential splicing of the single AAV intron (at nucleotides 2107 and 2227), result in the production of four rep proteins (rep 78, rep 68, rep 52, and rep 40) from the rep gene.
- Rep proteins possess multiple enzymatic properties that are ultimately responsible for replicating the viral genome.
- the cap gene is expressed from the p40 promoter and it encodes the three capsid proteins VP1, VP2, and VP3. Alternative splicing and non-consensus translational start sites are responsible for the production of the three related capsid proteins.
- a single consensus polyadenylation site is located at map position 95 of the AAV genome. The life cycle and genetics of AAV are reviewed in Muzyczka, Current Topics in Microbiology and Immunology, 158: 97-129 (1992).
- AAV possesses unique features that make it attractive as a vector for delivering foreign DNA to cells, for example, in gene therapy.
- AAV infection of cells in culture is noncytopathic, and natural infection of humans and other animals is silent and asymptomatic.
- AAV infects many mammalian cells allowing the possibility of targeting many different tissues in vivo.
- AAV transduces slowly dividing and non-dividing cells, and can persist essentially for the lifetime of those cells as a transcriptionally active nuclear episome (extrachromosomal element).
- the AAV proviral genome is infectious as cloned DNA in plasmids which makes construction of recombinant genomes feasible.
- AAV genome encapsidation and integration
- some or all of the internal approximately 4.3 kb of the genome encoding replication and structural capsid proteins, rep-cap
- the rep and cap proteins may be provided in trans.
- Another significant feature of AAV is that it is an extremely stable and hearty virus. It easily withstands the conditions used to inactivate adenovirus (56° to 65°C for several hours), making cold preservation of AAV less critical. AAV may even be lyophilized.
- AAV-infected cells are not resistant to superinfection.
- the invention provides gene therapy methods of delivering NT-3 for the treatment of CMT neuropathies and other muscle wasting disorders.
- the disclosure provides methods of stimulating muscle growth in a subject.
- the method comprises administering a therapeutically effective amount of neurotrophin-3 (NT-3), pro-NT-3, or an effective fragment thereof, or a nucleic acid encoding NT-3, pro-NT-3, or an effective fragment thereof, to a subject in need.
- NT-3 neurotrophin-3
- pro-NT-3 or an effective fragment thereof
- nucleic acid encoding NT-3, pro-NT-3, or an effective fragment thereof
- the NT-3, pro-NT-3, or an effective fragment thereof, or a nucleic acid encoding NT-3 or an effective fragment thereof of the disclosure is administered intramuscularly.
- the nucleic acid encoding NT-3 or an effective fragment thereof is administered using a viral vector.
- the viral vector is the adeno-associated virus (AAV) vector.
- AAV adeno-associated virus
- the nucleic acid encoding NT-3 or an effective fragment thereof of the disclosure is operatively linked to a muscle-specific promoter, such as a triple muscle-specific creatine kinase promoter.
- the nucleic acid encoding NT-3 or an effective fragment thereof of the disclosure comprises SEQ ID NO: 1.
- nucleic acids comprising, in order from 5' to 3': (i) a first AAV2 inverted terminal repeat sequence (ITR); (ii) a muscle creatine kinase promoter/enhancer sequence set out in nucleotides 147-860 of SEQ ID NO: 11; (iii) a nucleotide sequence encoding a human NT-3 polypeptide; and (iv) a second AAV2 ITR sequence; wherein the human NT-3 polypeptide has an amino acid sequence that is at least 90% identical to SEQ ID NO: 2 or is 100% identical to SEQ ID NO: 2, or is encoded by a nucleotide sequence 90% identical to nucleotides 1077-1850 of SEQ ID NO: 11 or 100% identical to nucleotides 1077-1850 of SEQ ID NO: 11.
- ITR AAV2 inverted terminal repeat sequence
- the nucleic acids of the disclosure further comprise 3 'to the promoter/enhancer, a chimeric intron set out in nucleotides 892-1024 of SEQ ID NO: 11.
- the nucleic acids of the disclosure can further comprise 3' to said nucleotide sequence encoding a human NT-3 polypeptide, a SV40 polyadenyation signal set out in nucleotides 1860- 2059 of SEQ ID NO: 11.
- any of the nucleic acids of the disclosure can comprise one or more inverted terminal repeat (ITR) sequences.
- the nucleic can comprise a first ITR whiich set out in nucleotides 7-112 of SEQ ID NO: 11, and/or a second ITR which is set out in nucleotides 2121- 2248 of SEQ ID NO: 11.
- the nucleic acids comprise an scAAVl.tMCK.NTF3 genome that is at least 90% identical to the nucleotide sequence set out in SEQ ID NO: 11.
- the disclosure also provides for recombinant adeno-associated virus particles (rAAV) comprising any of the nucleic acids of the disclosure, wherein the rAAV is infectious.
- the rAAV particles can be any rAAV serotype, such as AAV-1, AAV-2, AAV-3, AAV-4, AAV-5, AAV-6, AAV-7, AAV-8, AAV-9, AAV- 10, AAV-11, or AAVrh.74.
- the AAV DNA in the rAAV genome is from AAV-1.
- compositions comprising the rAAV of the disclosure and a pharmaceutically acceptable carrier.
- these compositions are formulated to treat a muscle wasting disorder or neuropathy in a subject in need thereof or these compositions are formulated to stimulate muscle growth in a subject in need thereof.
- administration is an intramuscular route and the dose of the rAAV administered is about 4x1012 vg/kg
- the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3
- the route of administration is an intramuscular route and the dose of the rAAV administered is about 6x1012 vg/kg
- k) the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3
- the route of administration is an intramuscular injection at a concentration of about 2x1013 vg/ml administered using 3 to 6 injections per muscle of about 0.5 to 1 ml, or 1) the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated virus (rAAV)
- the route of administration is an intramuscular injection at a
- the diclsoure provides for methods of improving muscle strength or stimulating muscle growth in a human subject in need thereof comprising the step of administering to the human subject a nucleic acid encoding the NT-3 polypeptide; wherein a) the nucleic acid comprises a nucleotide sequence that is 90% identical to the nucleotide sequence of SEQ ID NO: 1, b) the nucleic acid comprises the nucleotide sequence of SEQ ID NO: 1; c) the nucleic acid comprises a nucleic acid sequence encoding an amino acid sequence that is at least 90% identical to SEQ ID NO: 2 or is 100% identical to SEQ ID NO: 2, d) the nucleic acid encoding the NT-3 polypeptide is any of the nucleic acids of the disclosure, e) the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated evirus (rAAV) scAAVl.tMCK.NTF3, and
- the administration is an intramuscular route and the dose of the rAAV administered is about 2x1012 vg/kg to about 6x1012 vg/kg, h) the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3, the route of administration is an intramuscular route and the dose of the rAAV administered is about 2x1012 vg/kg, i) the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3, the route of administration is an intramuscular route and the dose of the rAAV administered is about 4x1012 vg/kg, j) the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated virus (rAAV) scAAVl.tMCK
- administration is an intramuscular route and the dose of the rAAV administered is about 6x1012 vg/kg, k) the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3, the route of administration is an intramuscular injection at a concentration of about 2x1013 vg/ml administered using 3 to 6 injections per muscle of about 0.5 to 1 ml, or 1) the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno- associated virus (rAAV) scAAVl.tMCK.NTF3, the route of administration is an intramuscular injection at a concentration of about 2x10 13 vg/ml administered using multiple injections at a total volume of about 5 to 14 ml.
- rAAV adeno-associated virus
- the nucleic acid is administered using a viral vector, such as adeno-associated virus vector.
- a viral vector such as adeno-associated virus vector.
- Any of the methods of the disclosure can be carried out with a nucleic acid that is is operatively linked to a muscle-specific promoter, such the muscle-specific creatine kinase (MCK) promoter.
- MCK muscle-specific creatine kinase
- any of the methods of the disclosure can be carried out with the scAAVl.tMCK.NTF3 comprises the NT-3 gene cassette set out in SEQ ID NO: 11.
- the disclosure provides for gene therapy methods using human neurotrophin-3 gene (NTF3) under control of a muscle specific promoter, tMCK, using a scAAVl vector, a self-complementary AAVl serotype.
- NVF3 human neurotrophin-3 gene
- the disclosure provides for methods of treating subjects diagnosed with a muscle wasting disorder or a neuropathy comprising administering an AAV vector expressing NT-3.
- the methods comprise administering the construct scAAVl.tMCK.NTF3 via intramuscular (IM) injection in the gastrocnemius and tibialis anterior muscle.
- IM intramuscular
- intramuscular delivery of an AAV vector expressing NT-3 e.g. scAAVl.
- tMCK.NTF3 initiates local production and secretion of NT-3 into the circulation thereby promoting nerve myelination and fiber regeneration leading to stabilization of the CMT disease phenotype. More particularly, the disclosureprovides for methods of administering scAAVl. tMCK.NTF3 at a dose of at about 2x10 12 vg/kg or at a dose of about 6x10 12 vg/kg.
- the scAAVl.tMCK.NTF3 comprises the NT-3 gene cassette set out in SEQ ID NO: 11.
- the disclosure also provides for methods of administering AAV vector expressing NT- 3 as a surrogate gene therapy for treating a muscle wasting disorder or a neuropathy.
- NT-3 has a short half-life and the methods of the disclosure comprise administering an AAV vector for a sustained release of NT-3 protein, even though the subject expresses endogenous NT-3 protein.
- the administration of the AAV vector provides sustained delivery of the NT-3 protien by sustained secretion by muscle cells. This continuous sustained low circulating level of NT-3 protein provides a therapeutic effect with a minimal risk of toxicity.
- Systemic production of NT-3 by gene therapy is also a more convenient and cost effective therapy option when compared to repeated injections of a purified NT-3 peptide.
- the disclosure provides for methods of treating a muscle wasting disorder or neuropathy in a human subject in need thereof comprising the step of administering to the human subject a dose of recombinant adeno-associated virus (rAAV) scAAVl. tMCK.NTF3 that results in sustained expression of a low concentration of NT-3 protein.
- rAAV recombinant adeno-associated virus
- the disclosure also provides for methods of stimulating muscle growth in a human subject in need thereof comprising the step of administering to the human subject a dose of recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3 that results in sustained expression of a low concentration of NT-3 protein.
- the disclosure provides for methods of treating a muscle wasting disorder or neuropathy in a human subject in need thereof comprising the step of administering to the human subject a recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3, wherein the route of administration is an intramuscular route and the dose of the rAAV
- administered is about 1.0x10 vg/kg to about 7x10 vg/kg, or about 1.5x 10 vg/kg to about 6.5xl0 12 vg/kg, or about 2xl0 12 vg/kg to about 6xl0 12 vg/kg.
- disclosure provides for methods of treating a muscle wasting disorder or neuropathy in a human subject in need thereof comprising the step of administering to the human subject a recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3, wherein the route of administration is an intramuscular route and the dose of the rAAV administered is about l.OxlO 1' vg/kg, or about 1.5x10 12 vg/kg, or about 2x1012 vg/kg, or about 3x1012 vg/kg, or about 4x1012
- rAAV recombinant adeno-associated virus
- the disclosure provides for methods of treating a muscle wasting disorder or neuropathy in human subject in need thereof comprising the step of administering to the human subject a recombinant adeno-associated virus (rAAV)
- rAAV recombinant adeno-associated virus
- scAAVl.tMCK.NTF3 wherein the route of administration is an intramuscular injection at a concentration of about 1x10 13 vg/ml.
- the rAAV is administered using 3 to 6 injections per muscle respectively, e.g. each injection volume will be 0.5 to 1 ml, wherein a total of 5mL to 14 mL of vector is administered to the medial and lateral heads of the gastroc and tibialis anterior muscle in each leg.
- the disclosure provides for methods of treating a muscle wasting disorder or neuropathy in a human subject in need thereof comprising the step of administering to the human subject a recombinant adeno-associated virus (rAAV)
- rAAV recombinant adeno-associated virus
- scAAVl.tMCK.NTF3 wherein the route of administration is an intramuscular injection at a concentration of about 2x10 13 vg/ml administered using 3 to 6 injections per muscle respectively (each injection volume will be 0.5 to 1 ml).
- a total of 5mL to 14 mL of vector is administered to the medial and lateral heads of the gastroc and tibialis anterior muscle in each leg.
- the provides for methods of improving muscle strength or stimulating muscle growth in a human subject in need thereof comprising the step of administering to the human subject a recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3, wherein the route of administration is an intramuscular route and the dose of the rAAV administered is about 1.0x10 12 vg/kg to about 7x1012 vg/kg, or about 1.5x 1012
- rAAV adeno-associated virus
- vg/kg to about 6.5x10 vg/kg, or about 2x10 vg/kg to about 6x10 vg/kg.
- the disclosure provides for methods of improving muscle strength or stimulating muscle growth in a human subject in need thereof comprising the step of administering to the human subject a recombinant adeno-associated virus (rAAV)
- rAAV recombinant adeno-associated virus
- scAAVl.tMCK.NTF3 wherein the route of administration is an intramuscular route and the dose of the rAAV administered is about 1.0x10 12 vg/kg,, or about 1.5x1012 vg/kg, or about 2x1012
- the disclosure provides for methods of improving muscle strength or stimulating muscle growth in human subject in need thereof comprising the step of administering to the human subject a recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3, wherein the route of administration is an intramuscular injection at a concentration of about 1x10 13 vg/ml.
- rAAV adeno-associated virus
- the route of administration is an intramuscular injection at a concentration of about 1x10 13 vg/ml.
- the rAAV is administered using 3 to 6 injections per muscle respectively, e.g. each injection volume will be 0.5 to 1 ml, wherein a total of 5mL to 14 mL of vector is administered to the medial and lateral heads of the gastroc and tibialis anterior muscle in each leg.
- the disclosure provides for methods of improving muscle strength or stimulating muscle growth in human subject in need thereof comprising the step of administering to the human subject a recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3, wherein the route of administration is an intramuscular injection at a concentration of about 1x10 13 vg/ml administered at low dose (2x1012 vg/kg per patient) and at high dose (6x10 12 vg/kg per patient) using 3 to 6 injections per muscle respectively (each injection volume will be 0.5 to 1 ml).
- a total of 5mL to 14 mL of vector is administered to the medial and latera heads of the gastroc and tibialis anterior muscle in each leg.
- the route of administration of scAAVl.tMCK.NTF3 is an intramuscular bilateral injection to the medial and lateral head of the gastrocnemius and tibialis anterior muscle.
- the administration of scAAVl.tMCK.NTF3 results in improved muscle strength in the subject is in the upper or lower extremities, and for example the improvement in the muscle strength is measured as a decrease in composite score on CMT Pediatric scale (CMTPeds).
- CMTPeds CMT Pediatric scale
- the administration of scAAVl.tMCK.NTF3 results in a decrease or halt in disease progression over a two-year time period. Disease progression is measured by the CMTPedS.
- Muscle strength is also measured using electromyography, hand held myometry, fixed system myometry, manual muscle tests, and/or functional/activity tests such as the Jebsen test, and ⁇ timed tests which evaluate how long it takes a subject to perform a specific task such as the 6-minute walk test, timed rise from floor, 10 meter walk/run, timed climb 4 steps and time descent 4 steps.
- the subject in any of the methods, is suffering from a hereditary neuropathy such as Charcot-Marie-Tooth (CMT) neuropathy, e.g. CMTIA , CMT2K, CMT4A, CMTRIA, and axonal and demyelinating neuropathies caused by an autosomal recessive genetic variant, or an autosomal dominant genetic variant or an X-linked genetic variant.
- CMT Charcot-Marie-Tooth
- the hereditary neuropathy may be caused by any of the genetic variants provided in Table 1.
- the hereditary neuropathy may be a transthyretin amyloid neuropathies caused by a mutation in the transthyretin (TTR) gene such as the following genetic variants: VaBOMet, IlelOWal, and SerWTyr.
- TTR transthyretin
- the subject in any of the methods, is suffering from an acquired neuropathy with axonal loss and/or impaired nerve regeneration.
- the acquired neuropathy is a peripheral neuropathy caused by any disorder or disease that is known to cause a neuropathy.
- the subject is suffering from peripheral neuropathy caused by diabetes mellitus, human immunodeficiency virus (HIV) infection, thyroid disorder such as HIV, human immunodeficiency virus (HIV)
- hypothyroidism hypoglycemia, uremia, renal insufficiency, hepatic dysfunction, hepatic failure, polycythemia, connective tissue disorders, cancer, lyme disease, celiac disease, leprosy, porphyria, Sjogren's syndrome, poliomyelitis, acromegaly, disorders of lipid/glycolipid metabolism, West Nile syndrome, amyloidosis, mitochondrial disorders, dysproteinemic disorders such as monoclonal gammapathy of undetermined significance (MGUS) or POEMS syndrome.
- the subject is suffering from a nutritional/vitamin deficiencies such as vitamin Bi 2 deficiency, vitamin E deficiency or copper deficiency.
- the subject is suffering from autoimmune peripheral polyneuropathy, acute inflammatory
- ADP demyelinating polyradiculoneuropathy
- CIDP polyradiculoneuropahty
- vasculitic mononeuritis multiplex vasculitic mononeuritis multiplex
- paraneuropathy idiopathic ganglionitis
- amyotrophic lateral sclerosis amyotrophic lateral sclerosis
- multifocal motor conduction lock neuropathy or lower motor neuron syndrome.
- the acquired neuropathy may be a toxic neuropathy.
- the toxic neuropathy is the result of the toxic effect of a prescribed medication, such Chlorampenicol, Choroquiline, Colchicine, Disulfiram, Etanercept, Ethambutal, gold, Hydroxychloroquine, Nitrofuantoin, Metronidazole, Stravudine, Zalcitabine, Infliximab, Leflunomide, Thalidomide or a chemotherapeutic agent such as Cisplatin, Cytarabine, Bortezombid, Docetaxal, Lenalidomide, Misondiazole, Oxaliplatin, Pacitaxal, Procarbazine, Suramin, Thalidomide, Vinblastine or Vincristine, or an anti-alcohol drug such as Disulfiran, or an anti-convulsant such as Phenytoin or Dilantin, or a heart or blood pressure medications such as statin, Amiodarone, Hydral
- the subject in any of the methods described herein, is a cancer patient suffering from an acquired neuropathy.
- the cancer patient developed a neuropathy related to nutritional deficiency, chemotherapy side effects, and/or paraneoplastic syndrome.
- the subject in any of the methods, is a surgical patient suffering from an acquired neuropathy.
- the surgical patient developed a neuropathy after undergoing bariatric surgery, multiple orthopedic procedures, or multiple surgeries for "entrapped nerves.”
- the subject in any of the methods, is suffering from hereditary myopathy, neuromuscular disease, muscular atrophy, drug-induced.myopathy, sarcopenia, cachexia, type II muscle fiber atrophy, a genetically determined muscular
- dystrophies age-related muscular atrophy or an acquired autoimmune primary muscle disorder.
- the subject is suffering from Duchenne muscular dystrophy, Becker muscular dystrophy, myotonic muscular dystrophy, sarcoglycanopathies, myotonic dystrophy, Emery-Dreifuss muscular dystrophy, congenital muscular dystrophy, Merosin-deficient congenital muscular dystrophy, Bethlem myopathy, Ullrich congenital muscular dystrophy, fascioscapulohumeral muscular dystrophy, spinal muscular dystrophy, rigid spine muscular dystrophy, distal muscular dystrophy, oculopharyngeal muscular dystrophy, Congenital Muscular Dystrophy (MDC) 1A, IB, 1C and ID; Limb Girdle Muscular Dystrophy (LGMD) 1A, IB, 1C, ID, IE, IF, 1G, 1H, 2A, 2B, 2C, 2D, 2E, 2F, 2G 2H, 21, 2J, 2K,
- MDC Muscular Dystrophy
- LGMD Limb
- Mitochondrial Myopathy Nemaline Myopathy; Nonaka Myopathy; Myasthenia Gravis; or Polymyositis.
- the disclosure provides for use of a therapeutically effective amount of neurotrophin-3 (NT-3), pro-NT-3, or an effective fragment thereof, or a nucleic acid encoding NT-3, pro-NT-3, or an effective fragment thereof, for the manufacture of a medicament for stimulating muscle growth in a subject.
- the medicament is formulated for intramuscular administration.
- the medicament comprises a nucleic acid encoding NT- 3, pro-NT-3, or an effective fragment thereof, wherein the nucleic acid in a viral vector.
- the viral vector is an adeno-associated virus vector.
- the nucleic acid is operatively linked to a muscle-specific promoter, such as triple muscle- specific creatine kinase promoter.
- the nucleic acid comprises SEQ ID NO: 1.
- the invention also provide for use of a nucleic acid encoding the NT-3 polypeptide for the manufacture of a medicament for treating a muscle wasting disorder or neuropathy in a human subject, wherein: a) the nucleic acid comprises a nucleotide sequence that is 90% identical to the nucleotide sequence of SEQ ID NO: 1, b) the nucleic acid comprises the nucleotide sequence of SEQ ID NO: 1; c) the nucleic acid comprises a nucleic acid sequence encoding the an amino acid sequence that is at least 90% identical to SEQ ID NO:2 or is 100% identical to SEQ ID NO: 2, d) the nucleic acid encoding the NT-3 polypeptide is any of the nucleic acids of the disclosure, e) the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated evirus (rAAV) scAAVl.tMCK.NTF3, and the rAAV is at a
- the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3
- the medicament is formulated for an intramuscular route of administration and the dose of the rAAV is about 2x1012 vg/kg to about 6x1012 vg/kg
- the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3
- the medicament is formulated for an intramuscular route of
- the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3
- the medicament is formulated for an intramuscular route of administration and the dose of the rAAV is about 4x1012 vg/kg
- the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3
- the medicament is formulated for an intramuscular route of administration and the dose of the rAAV administered is about 6x1012 vg/kg
- the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3
- the medicament is formulated for an intramuscular injection
- the disclosure also provides for use of a dose of a nucleic acid encoding the NT-3 polypeptide for the manufacture of a medicament for improving muscle strength or stimulating muscle growth in a human subject, wherein: a) the nucleic acid comprises a nucleotide sequence that is 90% identical to the nucleotide sequence of SEQ ID NO: 1, b) the nucleic acid comprises the nucleotide sequence of SEQ ID NO: 1; c) the nucleic acid comprises a nucleic acid sequence encoding the an amino acid sequence that is at least 90% identical to SEQ ID NO: 2 or is 100% identical to SEQ ID NO: 2, d) the nucleic acid encoding the NT-3 polypeptide is any of the nucleic acids of the disclosure, e) the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated evirus (rAAV) scAAVl.tMCK.NTF3, and the rAAV is at
- the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3
- the medicament is formulated for an intramuscular route of administration and the dose of the rAAV is about 2x1012 vg/kg to about 6x1012 vg/kg
- the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3
- the medicament is formulated for an intramuscular route of
- the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3
- the medicament is formulated for an intramuscular route of administration and the dose of the rAAV is about 4x1012 vg/kg
- the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3
- the medicament is formulated for an intramuscular route of administration and the dose of the rAAV administered is about 6x1012 vg/kg
- the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3
- the medicament is formulated for an intramuscular injection
- any of the medicmants of the disclosure can comprise a nucleic acid is formulated for administration using a viral vector, such as an adeno-associated virus vector.
- any of the medicaments of the disclosure can comprise a nucleic acid is operatively linked to a muscle-specific promoter, such as the muscle-specific promoter is muscle-specific creatine kinase promoter (MCK).
- a muscle-specific promoter such as the muscle-specific promoter is muscle-specific creatine kinase promoter (MCK).
- scAAVl.tMCK.NTF3 comprises the NT-3 gene cassette set out in SEQ ID NO: 11.
- the disclosure provide for use of a recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3 for the preparation of a medicament for treating a muscle wasting disorder or neuropathy in a human subject in need thereof, wherein the medicament results in sustained expression of a low concentration of NT-3 protein.
- the disclosure provides for use of a recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3 for the preparation of a medicament for stimulating muscle growth in a human subject in need thereof, wherein the dose results in sustained expression of a low concentration of NT-3 protein.
- the disclosure provides for use of a recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3 for the preparation of a medicament for treating a muscle wasting disorder or neuropathy in a human subject in need thereof, wherein the medicament is formulated for an intramuscular route of administration, and wherein the medicament comprises a dose of the rAAV that is about l.OxlO 12 vg/kg to about 7xl0 12 vg/kg, or about 1.5x 10 12 vg/kg
- the disclosure provides for use of a recombinant adeno- associated virus (rAAV) scAAVl.tMCK.NTF3 for the preparation of a medicament for treating a muscle wasting disorder or neuropathy in a human subject in need thereof, wherein the medicament is formulated for an intramuscular route of administration, and wherein the medicament comprises a dose of the rAAV that is about is about 1.0x10 12 vg/kg, or about
- rAAV recombinant adeno- associated virus
- the disclosure provides for use of a recombinant adeno- associated virus (rAAV) scAAVl.tMCK.NTF3 for the preparation of a medicament for treating a muscle wasting disorder or neuropathy in a human subject in need thereof, wherein the medicament is formulated for an intramuscular route of administration, and wherein the medicament comprises a concentration of the rAAV that is about 2x10 13 vg/ml.
- the medicament is administered using 3 to 6 injections per muscle respectively e.g.
- each injection volume will be 0.5 to 1 ml to the medial and lateral heads of the gastroc and tibialis anterior muscle in each leg, wherein a total of 5mL to 14 mL of vector will be administered to the medial and lateral heads of the gastroc and tibialis anterior muscle in each leg.
- the disclosure provides for use of a recombinant adeno- associated virus (rAAV) scAAVl.tMCK.NTF3 for the preparation of a medicament for treating a muscle wasting disorder or neuropathy in a human subject in need thereof, wherein the medicament is formulated for an intramuscular route of administration, and wherein the medicament comprises a dose of the rAAV that is about 1x10 vg/ml administered using 3 to 6 injections per muscle respectively (each injection volume will be 0.5 to 1 ml). A total of 5mL to 14 mL of vector is administered to the medial and lateral heads of the gastroc and tibialis anterior muscle in each leg.
- rAAV recombinant adeno- associated virus
- the disclosure provides for use of a recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3 for the preparation of a medicament for improving muscle strength or stimulating muscle growth in a human subject in need thereof, wherein the medicament is formulated for an intramuscular route of administration, and wherein the medicament comprises a dose of the rAAV that is about 1.0x10 12 vg/kg to about 7x1012 vg/kg, or about 1.5x 10 12 vg/kg to about 6.5xl0 12 vg/kg, or about 2xl0 12 vg/kg to about 6xl0 12 vg/kg.
- rAAV recombinant adeno-associated virus
- the disclosure provides for use of a recombinant adeno- associated virus (rAAV) scAAVl.tMCK.NTF3 for the preparation of a medicament for improving muscle strength or stimulating muscle growth in a human subject in need thereof, wherein the medicament is formulated for an intramuscular route of administration, and wherein the medicament comprises a dose of the rAAV that is about 1.0x10 12 vg/kg, or about 1.5x1012
- 12 12 12 12 12 12 12 12 12 vg/kg or about 2x10 vg/kg, or about 3x10 vg/kg, or about 4x10 vg/kg, or about 5x10 vg/kg, or about 6x10 12 vg/kg, or about 7x1012 vg/kg, or about 8x1012 vg/kg, or about 9x 1012 vg/kg, or about lxlO 13 vg/kg.
- the disclosure provides for use of a recombinant adeno- associated virus (rAAV) scAAVl.tMCK.NTF3 for the preparation of a medicament for improving muscle strength or stimulating muscle growth in a human subject in need thereof, wherein the medicament is formulated for an intramuscular route of administration, and wherein the medicament comprises a concentration of the rAAV that is about 2x10 13 vg/ml administered at low dose (2x10 12 vg/kg per patient) and at high dose (6x1012 vg/kg per patient).
- the medicament is administered using 3 to 6 injections per muscle respectively, e.g.
- each injection volume is 0.5 to 1 ml to the medial and lateral heads of the gastroc and tibialis anterior muscle in each leg.
- a total of 5mL to 14 mL of vector will be administered to the medial and lateral heads of the gastroc and tibialis anterior muscle in each leg.
- the disclosure provides for use of a recombinant adeno- associated virus (rAAV) scAAVl.tMCK.NTF3 for the preparation of a medicament for improving muscle strength or stimulating muscle growth in a human subject in need thereof, wherein the medicament is formulated for an intramuscular route of administration, and wherein the medicament comprises a concentration of the rAAV that is about 2x10 13 vg/ml administered at low dose (2x10 12 vg/kg per patient) and at high dose (6x1012 vg/kg per patient) using 3 to 6 injections per muscle respectively (each injection volume will be 0.5 to 1 ml). A total of 5mL to 14 mL of vector will be administered to the medial and lateral heads of the gastroc and tibialis anterior muscle in each leg.
- rAAV adeno- associated virus
- the medicament is formulated for intramuscular bilateral injection to the medial and lateral head of the gastrocnemius and tibialis anterior muscle.
- the medicament results in improved muscle strength in the subject is in the upper or lower extremities, and for example the improvement in the muscle strength is measured as a decrease in composite score on CMT Pediatric scale (CMTPedS).
- CMTPedS CMT Pediatric scale
- the medicament results in a decrease or halt in disease progression over a two-year time period. Disease progression is measured by the CMTPedS.
- the subject in any of the uses of the disclosure, is suffering from a hereditary neuropathy such as Charcot-Marie-Tooth (CMT) neuropathy, e.g. CMT1A, CMT2K, CMT4A, CMTRIA, and axonal and demyelinating neuropathies caused by an autosomal recessive genetic variant, or an autosomal dominant genetic variant or an X-linked genetic variant.
- CMT Charcot-Marie-Tooth
- the hereditary neuropathy may be caused by any of the genetic variants provided in Table 1.
- the hereditary neuropathy may be a transthyretin amyloid neuropathies caused by a mutation in the transthyretin (TTR) gene such as the following genetic variants: VaBOMet, IlelOWal, and SerWTyr.
- TTR transthyretin
- the subject in any of the methods of the invention, is suffering from an acquired neuropathy with axonal loss and/or impaired nerve regeneration.
- the acquired neuropathy is a peripheral neuropathy caused by any disorder or disease that causes neuropathy.
- the subject is suffering from peripheral neuropathy caused by diabetes mellitus, human immunodeficiency virus (HIV) infection, thyroid disorder such as HIV, human immunodeficiency virus (HIV)
- hypothyroidism hypoglycemia, uremia, renal insufficiency, hepatic dysfunction, hepatic failure, polycythemia, connective tissue disorders, cancer, lyme disease, celiac disease, leprosy, porphyria, Sjogren's syndrome, poliomyelitis, acromegaly, disorders of lipid/glycolipid metabolism, West Nile syndrome, amyloidosis, mitochondrial disorders, dysproteinemic disorders such as monoclonal gammapathy of undetermined significance (MGUS) or POEMS syndrome.
- the subject may be suffering from a nutritional/vitamin deficiencies such as vitamin B i2 deficiency, vitamin E deficiency or copper deficiency.
- the subject is suffering from
- AIDP chronic inflammatory demyelinating polyradiculoneuropathy
- CIDP chronic inflammatory demyelinating polyradiculoneuropathy
- vasculitic mononeuritis multiplex paraneuropathy
- paraneuropathy idiopathic ganglionitis
- amyotrophic lateral sclerosis amyotrophic lateral sclerosis
- multifocal motor conduction lock neuropathy or lower motor neuron syndrome.
- the acquired neuropathy is a toxic neuropathy.
- the toxic neuropathy is the result of the toxic effect of a prescribed medication, such Chlorampenicol, Choroquiline, Colchicine, Disulfiram, Etanercept, Ethambutal, gold, Hydroxychloroquine, Nitrofuantoin, Metronidazole, Stravudine, Zalcitabine, Infliximab, Leflunomide, Thalidomide or a
- chemotherapeutic agent such as Cisplatin, Cytarabine, Bortezombid, Docetaxal, Lenalidomide, Misondiazole, Oxaliplatin, Pacitaxal, Procarbazine, Suramin, Thalidomide, Vinblastine or Vincristine, or an anti-alcohol drug such as Disulfiran, or an anti-convulsant such as Phenytoin or Dilantin, or a heart or blood pressure medications such as a statin, Amiodarone, Hydralazine, procainamide, Perhexiline, or an antibiotic such as Fluoroquinolones, Isoniazid, Cipro, Levaquin, Flagyl, or Metrondiazole , or a skin condition treatments such as Dapsone.
- the toxic toxic agent such as Cisplatin, Cytarabine, Bortezombid, Docetaxal, Lenalidomide, Misondiazole, Oxaliplatin, Pacitaxal
- neuropathy may be caused by long term alcohol abuse or vitamin B 6 toxicity.
- the subject is a cancer patient suffering from an acquired neuropathy.
- the cancer patient developed a neuropathy related to nutritional deficiency, chemotherapy side effects, and/or paraneoplastic syndrome.
- the subject is a surgical patient suffering from an acquired neuropathy.
- the surgical patient developed a neuropathy after undergoing bariatric surgery, multiple orthopedic procedures, or multiple surgeries for "entrapped nerves.”
- the subject is suffering from hereditary myopathy, neuromuscular disease, muscular atrophy, drug-induced, myopathy, sarcopenia, cachexia, type II muscle fiber atrophy, a genetically determined muscular
- the subject is suffering from Duchenne muscular dystrophy, Becker muscular dystrophy, myotonic muscular dystrophy, sarcoglycanopathies, myotonic dystrophy, Emery-Dreifuss muscular dystrophy, congenital muscular dystrophy, Merosin-deficient congenital muscular dystrophy, Bethlem myopathy, Ullrich congenital muscular dystrophy, fascioscapulohumeral muscular dystrophy, spinal muscular dystrophy, rigid spine muscular dystrophy, distal muscular dystrophy, oculopharyngeal muscular dystrophy, Congenital Muscular Dystrophy (MDC) 1A, IB, 1C and ID; Limb Girdle Muscular Dystrophy (LGMD) 1A, IB, 1C, ID, IE, IF, 1G, 1H, 2A, 2B, 2C, 2D
- Mitochondrial Myopathy Nemaline Myopathy; Nonaka Myopathy; Myasthenia Gravis; or Polymyositis.
- the disclosure provides for a composition comprising a therapeutically effective amount of neurotrophin-3 (NT-3), pro-NT-3, or an effective fragment thereof, or a nucleic acid encoding NT-3, pro-NT-3, or an effective fragment thereof, for use in stimulating muscle growth in a subject.
- NT-3 neurotrophin-3
- pro-NT-3 or an effective fragment thereof
- nucleic acid encoding NT-3, pro-NT-3, or an effective fragment thereof for use in stimulating muscle growth in a subject.
- the compositions of the disclosure are formulated for intramuscular administration.
- the composition comprises a nucleic acid encoding NT- 3, pro-NT-3, or an effective fragment thereof.
- the nucleic acid in a viral vector, such as an an adeno-associated virus vector.
- the nucleic acid is operatively linked to a muscle- specific promoter, such as triple muscle-specific creatine kinase promoter.
- the composition comprises a nucleic acid comprising the nucleotide sequence of SEQ ID NO: 1.
- compositions comprising a nucleic acid encoding a NT-3 polypeptide for use in treating a muscle wasting disorder or neuropathy in a human subject, wherein: a) the nucleic acid comprises a nucleotide sequence that is 90% identical to the nucleotide sequence of SEQ ID NO: 1, b) the nucleic acid comprises the nucleotide sequence of SEQ ID NO: 1; c) the nucleic acid comprises a nucleic acid sequence encoding an amino acid sequence that is at least 90% identical to SEQ ID NO: 2 or is 100% identical to SEQ ID NO: 2, d) the nucleic acid encoding the NT-3 polypeptide is any of the nucleic acids of the disclosure, e) the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated evirus (rAAV) scAAVl.tMCK.NTF3, and the rAAV is administered at a dose that results
- the composition is formulated for an intramuscular route of administration and the dose of the rAAV is about 4x1012 vg/kg, j) the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3, the composition is formulated for an intramuscular route of
- the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated virus (rAAV)
- the composition is formulated for an intramuscular injection at a concentration of about 2x1013 vg/ml administered using 3 to 6 injections per muscle of about 0.5 to 1 ml, or 1) the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno- associated virus (rAAV) scAAVl.tMCK.NTF3, the composition is formulated for an
- intramuscular injection at a concentration of about 2x10 13 vg/ml administered using multiple injections at a total volume of about 5 to 14 ml.
- the disclosure provides for composition comprising a nucleic acid encoding the NT-3 polypeptide for use in improving muscle strength or stimulating muscle growth in a human subject, wherein a) the nucleic acid comprises a nucleotide sequence that is 90% identical to the nucleotide sequence of SEQ ID NO: 1, b) the nucleic acid comprises the nucleotide sequence of SEQ ID NO: 1; c) the nucleic acid comprises a nucleic acid sequence encoding the an amino acid sequence that is at least 90% identical to SEQ ID NO:2 or is 100% identical to SEQ ID NO: 2, d) th the nucleic acid encoding the NT-3 polypeptide is any of the nucleic acids of the disclosure, e) the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated evirus (rAAV) scAAVl.tMCK.NTF3, and the rAAV is at a dose that results
- the composition is formulated for an intramuscular route of administration and the dose of the rAAV is about 1.5x1012 vg/kg to about 6.5x1012 vg/kg, g) the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3, the composition is formulated for an intramuscular route of administration and the dose of the rAAV is about 2x1012 vg/kg to about 6x1012 vg/kg, h) the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3, the composition is formulated for an intramuscular route of
- the composition is formulated for an intramuscular route of administration and the dose of the rAAV is about 4x1012 vg/kg
- the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3
- the composition is formulated for an intramuscular route of administration and the dose of the rAAV is about 4x1012 vg/kg
- the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3
- the composition is formulated for an intramuscular route of administration and the dose of the rAAV is about 6x1012 vg/kg
- the nucleic acid encoding the NT-3 polypeptide is the recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3
- intramuscular injection at a concentration of about 2x10 13 vg/ml administered using multiple injections at a total volume of about 5 to 14 ml.
- any of the composition of the disclosure can comprise a nucleic acid is formulated for administration using a viral vector, such as an adeno-associated virus vector.
- a viral vector such as an adeno-associated virus vector.
- any of the compositions of the disclosure can comprise a nucleic acid is operatively linked to a muscle-specific promoter, such as the muscle-specific promoter is muscle-specific creatine kinase promoter (MCK).
- scAAVl.tMCK.NTF3 comprises the NT-3 gene cassette set out in SEQ ID NO: 11.
- compositions comprising a dose of recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3 for treating a muscle wasting disorder or neuropathy in a human subject in need thereof, that results in in sustained expression of a low concentration of NT- 3 protein.
- rAAV recombinant adeno-associated virus
- the disclosure provide for use of a recombinant adneo- associated virus (rAAV) scAAVl.tMCK.NTF3 for the stimulating muscle growth in a human subject in need thereof that results in sustained expression of a low concentration of NT-3 protein.
- rAAV adneo- associated virus
- compositions comprising a dose of recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3 for treating a muscle wasting disorder or neuropathy in a human subject in need thereof, wherein the composition is formulated for intramuscular administration and the dose of the rAAV administered is about
- compositions comprising a dose of recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3 for treating a muscle wasting disorder or neuropathy in a human subject in need thereof, wherein the composition is formulated for intramuscular administration and the dose of the rAAV administered is about
- 1.0x10 vg/kg or about 1.5x10 vg/kg, or about 2x10 vg/kg, or about 3x10 vg/kg, or about
- 4x10 vg/kg or about 5x10 vg/kg, or about 6x10 vg/kg, or about 7x10 vg/kg, or about 8xl0 12 vg/kg, or about 9x 10 12 vg/kg, or about lxlO 13 vg/kg.
- compositions comprising a dose of recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3 for treating a muscle wasting disorder or neuropathy in a human subject in need thereof, wherein the composition is formulated for intramuscular administration and the dose of the rAAV administered is about
- the composition is administered using 3 to 6 injections per muscle respectively (each injection volume will be 0.5 to 1 ml) to the medial and lateral heads of the gastroc and tibialis anterior muscle in each leg. A total of 5mL to 14 mL of vector will be administered to the medial and lateral heads of the gastroc and tibialis anterior muscle in each leg.
- compositions comprising a dose of recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3 for treating a muscle wasting disorder or neuropathy in a human subject in need thereof, wherein the composition is formulated for intramuscular administration and the dose of the rAAV administered is about
- each injection volume will be 0.5 to 1 ml.
- a total of 5 mL to 14 mL of vector will be administered to the medial and lateral heads of the gastroc and tibialis anterior muscle in each leg.
- the disclosure provides for compositions comprising a dose of recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3 for improving muscle strength in a human subject, wherein the composition is formulated for intramuscular administration and the dose of the rAAV administered is about 1.0x10 12 vg/kg to about 7x1012 vg/kg, or about 1.5x 10 12 vg/kg to about 6.5x1012 vg/kg, or about 2x1012 vg/kg to about 6x1012 vg/kg.
- rAAV recombinant adeno-associated virus
- compositions comprising a dose of recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3 for improving muscle strength in a human subject, wherein the composition is formulated for intramuscular administration and the dose of the rAAV administered is about 1.0x10 12 vg/kg span or about
- rAAV recombinant adeno-associated virus
- the disclosure provides for compositions comprising a dose of recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3 for improving muscle strength or stimulating muscles growth in a human subject in need thereof, wherein the composition is formulated for intramuscular administration and the dose of the rAAV administered is about 2x10 13 vg/ml administered at low dose (2x1012 vg/kg per patient) and at high dose (6x10 12 vg/kg per patient).
- the composition is administered using 3 to 6 injections per muscle respectively (each injection volume will be 0.5 to 1 ml) to the medial and lateral heads of the gastroc and tibialis anterior muscle in each leg. A total of 5mL to 14 mL of vector will be administered to the medial and lateral heads of the gastroc and tibialis anterior muscle in each leg.
- compositions comprising a dose of recombinant adeno-associated virus (rAAV) scAAVl.tMCK.NTF3 for improving muscle strength or stimulating muscle growth in a human subject in need thereof, wherein the composition is formulated for intramuscular administration and the dose of the rAAV
- rAAV recombinant adeno-associated virus
- each injection volume will be 0.5 to 1 ml).
- a total of 5 mL to 14 mL of vector will be administered to the medial and lateral heads of the gastroc and tibialis anterior muscle in each leg.
- scAAVl.tMCK.NTF3 is an intramuscular bilateral injection to the medial and lateral head of the gastrocnemius and tibialis anterior muscle.
- the administration of scAAVl.tMCK.NTF3 results in improved muscle strength in the subject is in the upper or lower extremities, and for example the improvement in the muscle strength is measured as a decrease in composite score on CMT Pediatric scale (CMTPedS).
- CMTPedS CMT Pediatric scale
- the administration of the composition results in a decrease or halt in disease progression over a two-year time period. Disease progression is measured by the CMTPedS.
- the CMTPedS is an 11-item scale comprised of the Functional Dexterity Test, Nine-Hole Peg Test (9HPT), hand grip, foot plantar flexion, and foot dorsiflexion strength using handheld myometry, pinprick and vibration sensation, the Bruininks Oseretsky Test- Balance assessment, gait assessment, long jump, and six-minute walk test (6MWT).
- the efficacy defined as halting of the decline in abilities measured by this scale at 2 years post gene transfer.
- the subject in any of the compositions, is suffering from hereditary neuropathies such as Charcot-Marie-Tooth (CMT) neuropathy, e.g. CMTIA, CMT2K, CMT4A, CMTRIA and axonal and demyelinating europathies caused by an autosomal recessive genetic variant, or an autosomal dominant genetic variant or an X-linked genetic variant.
- CMT Charcot-Marie-Tooth
- CMTIA Charcot-Marie-Tooth
- CMT2K Charcot-Marie-Tooth
- CMTRIA axonal and demyelinating europathies caused by an autosomal recessive genetic variant
- the hereditary neuropathy may be caused by any of the genetic variants provided in Table 1.
- the hereditary neuropathy may be a transthyretin amyloid neuropathies caused by a mutation in the transthyretin (TTR) gene such as the following genetic variants: Val30Met, IlelOWal, and SerWTyr.
- TTR transthyretin
- the subject is suffering from an acquired neuropathy with axonal loss and/or impaired nerve regeneration.
- the acquired neuropathy is a peripheral neuropathy caused by any disorder or disease that causes neuropathy.
- the subject is suffering from peripheral neuropathy caused by diabetes mellitus, human immunodeficiency virus (HIV) infection, thyroid disorder such as hypothyroidism, hypoglycemia, uremia, renal insufficiency, hepatic dysfunction, hepatic failure, polycythemia, connective tissue disorders, cancer, lyme disease, celiac disease, leprosy, porphyria, Sjogren's syndrome, poliomyelitis, acromegaly, disorders of lipid/glycolipid metabolism, West Nile syndrome, amyloidosis, mitochondrial disorders, dysproteinemic disorders such as monoclonal gammapathy of undetermined significance (MGUS) or POEMS syndrome.
- the subject is suffering from a nutritional/vitamin
- the subject is suffering from autoimmune peripheral polyneuropathy, acute inflammatory demyelinating
- AIDP chronic inflammatory demyelinating polyradiculoneuropahty
- CIDP chronic inflammatory demyelinating polyradiculoneuropahty
- vasculitic mononeuritis multiplex paraneuropathy
- idiopathic ganglionitis amyotrophic lateral sclerosis
- multifocal motor conduction lock neuropathy or lower motor neuron syndrome.
- the acquired neuropathy is a toxic neuropathy.
- the toxic neuropathy is the result of the toxic effect of a prescribed medication, such Chlorampenicol, Choroquiline, Colchicine, Disulfiram, Etanercept,
- Ethambutal Gold, Hydroxychloroquine, Nitrofuantoin, Metronidazole, Stravudine, Zalcitabine, Infliximab, Leflunomide, Thalidomide or a chemotherapeutic agent such as Cisplatin,
- the toxic neuropathy is also caused by long term alcohol abuse or vitamin B 6 toxicity.
- the subject in any of the compositions, is a cancer patient suffering from an acquired neuropathy.
- the cancer patient developed a neuropathy related to nutritional deficiency, chemotherapy side effects, and/or paraneoplastic syndrome.
- the subject in any of the compositions, is a surgical patient suffering from an acquired neuropathy.
- the surgical patient developed a neuropathy after undergoing bariatric surgery, multiple orthopedic procedures, or multiple surgeries for "entrapped nerves.”
- the subject in any of the, is suffering from hereditary myopathy, neuromuscular disease, muscular atrophy, drug-induced, myopathy, sarcopenia, cachexia, type II muscle fiber atrophy, a genetically determined muscular dystrophies, age-related muscular atrophy or an acquired autoimmune primary muscle disorder.
- the subject is suffering from Duchenne muscular dystrophy, Becker muscular dystrophy, myotonic muscular dystrophy, sarcoglycanopathies, myotonic dystrophy, Emery-Dreifuss muscular dystrophy, congenital muscular dystrophy, Merosin-deficient congenital muscular dystrophy, Bethlem myopathy, Ullrich congenital muscular dystrophy, fascioscapulohumeral muscular dystrophy, spinal muscular dystrophy, rigid spine muscular dystrophy, distal muscular dystrophy, oculopharyngeal muscular dystrophy, Congenital Muscular Dystrophy (MDC) 1A, IB, IC and ID; Limb Girdle Muscular Dystrophy (LGMD) 1A, IB, IC, ID, IE, IF, 1G, 1H, 2A, 2B, 2C, 2D, 2E, 2F, 2G 2H, 21, 2J, 2K
- Mitochondrial Myopathy Nemaline Myopathy; Nonaka Myopathy; Myasthenia Gravis; or Polymyositis.
- the subject in any of the compositions, is suffering from traumatic nerve injuries such as nerve injuries caused by compression, double crush or transection.
- Figures 1A-C provide graphs and images showing AAV1.NT-3 -induced fiber type remodeling in TrJ muscle. Representative images of SDH-stained tissue sections of
- Trembler J Trembler J
- TrJ-PBS untreated gastrocnemius muscle
- Fig. IB gastrocnemius muscle
- Slow twitch oxidative STO, arrows
- FTO fast twitch oxidative
- FGS fast twitch glycolytic
- Oxidative fibers are decreased in a.
- TrJ-PBS muscle Fig. IB
- increased numbers of small STO fibers and angular fibers of all fiber types are present along with small type groupings compatible with neurogenic changes.
- Scale bar 30 gm for a, b.
- Figures 2A-C provide graphs and images showing the effect of AAV 1 .NT3 treatment on mTOR signaling and metabolic markers.
- the graphs show expression levels of the phosphorylated form of proteins normalized to GAPDH.
- Figures 3A-D provide graphs and images showing the direct effect of NT-3 on myotubes.
- FIG. 3 A Representative western blot images and analysis of Akt/mTOR pathway, Phospho (P)-Akt (Ser473), P-4EBP1 (Thr37/46), and P-S6 (Ser235/236) in myotubes incubated with recombinant human NT-3 (100 ng/ml) or PBS (control) for 30 minutes. Density values of phosphorylated protein bands were normalized to GAPDH and showed as percent of control group. Coomassie Blue stained membrane represents equal gel loading.
- FIG. 3B Myotubes were incubated with NT-3 (100 ng/ml) for 48 hours then, relative mRNA expression of metabolic markers (PGCla, HK1, PK1) was detected by qPCR (Fig. 3B), and glucose consumption versus lactate production in cell culture media was detected by ELISA (Fig. 3C).
- FIG. 3D Relative expression levels of myogenin and NT-3 receptors, P75NTR and TrkC in myoblasts versus myotubes after NT-3 (100 ng /ml) treatment for 48 hours. GAPDH was as housekeeping gene in the analyses. The results shown are mean + SEM from at least three independent experiment, *P ⁇ 0.05, Student's paired t- test.
- Figure 4 provides a graph showing serum levels of NT-3 in treated and non treated mice. At the Endpoint serum was collected from each mouse and circulating NT-3 levels were detected by ELISA.
- Figure 5 shows the relative mRNA expression of P75 NTR and TrkC in TrJ and WT gastrocnemius muscle. GAPDH was as housekeeping gene in the analyses. The results shown are mean + SEM from at least three independent experiment, *P ⁇ 0.05, Student's t- test.
- Figure 6 provides a schematic of the construct AAV.tMCK.NTF3 (SEQ ID NO: 11).
- the vector contains the muscle specific tMCK promoter (SEQ ID NO: 3), chimeric intron (SEQ ID NO: 5), consensus Kozak sequence (SEQ ID NO: 6), the NTF3 cDNA (SEQ ID No: 1), and a polyadenylation signal (SEQ ID NO: 7).
- Figure 7 provides a restriction map and ORF Analysis pAAV.tMCK.NTF3.
- Figure 8A-8B indicate the location of IM injection of AAV.tMCK.NTF3 in human subjects.
- Figure 9 provides the nucleotide sequence of AAV.tMCK.NTF3 (SEQ ID NO: 11).
- NT-3 a novel effect of NT-3;its ability to directly influence the protein synthesis and metabolic remodeling in neurogenic muscle.
- mTORCl mammalian target of rapamycin complex 1
- the mTORCl regulates translation and ribosome biogenesis through the phosphorylation of the translational regulators eukaryotic translation initiation factor 4E binding protein 1 (4E-BP1) and S6 kinase 1 (S6K1).
- E-BP1 eukaryotic translation initiation factor 4E binding protein 1
- S6K1 S6 kinase 1
- TrJ muscle histochemical changes in the TrJ muscle were accompanied by increased phosphorylation levels of 4E-BP1 and S6 protein (S6P) as evidence of mTORCl activation.
- S6P S6 protein
- the expression levels of mitochondrial biogenesis regulator (peroxisome proliferator- activated receptor y coactivator 1 a, PGCla) increased in the TrJ muscle.
- mitochondrial biogenesis regulator peroxisome proliferator- activated receptor y coactivator 1 a, PGCla
- hexokinase-1, HK1 and pyruvate kinase 1, PK1 increased in the TrJ muscle.
- NT-3 treated WT muscle.
- in vitro studies showed that recombinant NT-3 can directly induce Akt/mTOR pathway activation in the TrkC expressing myotubes but not in myoblasts.
- myogenin expression levels were significantly high in the myotubes while p75NTR expression was downregulated compared to myoblast
- the present disclosure relates to methods of stimulating muscle growth in a subject.
- the method includes administering a therapeutically effective amount of neurotrophin-3 (NT-3), pro-NT-3, or an effective fragment thereof, or a nucleic acid encoding NT-3, pro-NT-3, or an effective fragment thereof, to a subject in need thereof.
- Subjects in need of stimulating muscle growth include those having muscular dystrophy or muscle atrophy.
- the invention provides for method of inhibiting muscle wasting comprising administering an AAV vector to deliver the neurotrophin-3 (NT-3) encoding NTF3 gene.
- the invention provides for gene therapy methods of treating Charcot-Marie-Tooth type 1A (CMT1A) wherein the NT-3 encoding NTF3 gene is delivered to the subject using self- complementary adeno-associated virus (scAAV) type 1 under control of a muscle- specific tMCK promoter.
- the invention provides gene therapy methods of increasing muscle strength in subjects in need thereof, e.g. subjects diagnosed or suffering from a muscle wasting disorders such as CMT.
- treatment refers to obtaining a desired pharmacologic or physiologic effect.
- the effect may be therapeutic in terms of a partial or complete cure for a disease or an adverse effect attributable to the disease.
- Treatment covers any treatment of a disease in a mammal, particularly in a human, and can include inhibiting the disease or condition, i.e., arresting its development; and relieving the disease, i.e., causing regression of the disease.
- Prevention refers to any action providing a benefit to a subject at risk of being afflicted with a condition or disease such neuropathy, demyelinating polyneuropathy, muscle wasting disorders or atrophy.
- “Pharmaceutically acceptable” as used herein means that the compound or composition is suitable for administration to a subject for the methods described herein, without unduly deleterious side effects in light of the severity of the disease and necessity of the treatment.
- terapéuticaally effective and “pharmacologically effective” are intended to qualify the amount of an agent which will achieve the goal of improvement in disease severity and the frequency of incidence.
- the effectiveness of treatment may be measured by evaluating a reduction in symptoms in a subject in response to the administration of NT-3.
- NT-3 fragment refers to a portion of the polynucleotide sequence encoding a functional fragment of the NT-3 polypeptide.
- the term “effective fragment” also refers to a portion of the NT-3 polypeptide amino acid sequence that retains NT-3 growth factor activity.
- Exemplary NT-3 growth factor activities include supporting the surivival and differentiation of existing neurons, and inducing and supporting the growth and differentiation of new neurons and synapses.
- NT-3 activity includes stimulating muscle growth and muscle function.
- diagnosis can encompass determining the likelihood that a subject will develop a disease, or the existence or nature of disease in a subject.
- diagnosis as used herein also encompasses determining the severity and probable outcome of disease or episode of disease or prospect of recovery, which is generally referred to as prognosis).
- diagnosis can also encompass diagnosis in the context of rational therapy, in which the diagnosis guides therapy, including initial selection of therapy, modification of therapy (e.g., adjustment of dose or dosage regimen), and the like.
- a "subject,” as used herein, can be any animal, and may also be referred to as the patient.
- the subject is a vertebrate animal, and more preferably the subject is a mammal, such as a domesticated farm animal (e.g., cow, horse, pig) or pet (e.g., dog, cat), in some embodiments, the subject is a human.
- a domesticated farm animal e.g., cow, horse, pig
- pet e.g., dog, cat
- nucleic acid refers to a polymeric form of nucleotides of at least 10 bases in length.
- the term includes DNA molecules (e.g., eDNA or genomic or synthetic DNA) and RNA molecules (e.g., mRNA or synthetic RNA), as well as analogs of DNA or RNA containing non-natural nucleotide analogs, non-native inter-nucleoside bonds, or both.
- the nucleic acid can be in any topological conformation. For instance, the nucleic acid can be single- stranded, double- stranded, triple-stranded, quadruplexed, partially double-stranded, branched, hair-pinned, circular, or in a padlocked conformation.
- gene refers to a nucleotide sequence that can direct synthesis of an enzyme or other polypeptide molecule (e.g., can comprise coding sequences, for example, a contiguous open reading frame (ORF) which encodes a polypeptide) or can itself be functional in the organism.
- ORF open reading frame
- a gene in an organism can be clustered within an operon, as defined herein, wherein the operon is separated from other genes and/or operons by intergenic DNA. Individual genes contained within an operon can overlap without intergenic DNA between the individual genes.
- AAV is a standard abbreviation for adeno-associated virus.
- Adeno-associated virus is a single- stranded DNA parvovirus that grows only in cells in which certain functions are provided by a co-infecting helper virus.
- serotypes of AAV There are currently thirteen serotypes of AAV that have been characterized. General information and reviews of AAV can be found in, for example, Carter, 1989, Handbook of Parvoviruses, Vol. 1, pp. 169-228, and Berns, 1990, Virology, pp. 1743-1764, Raven Press, (New York).
- vector refers to any type of genetic construct comprising a nucleic acid coding for an RNA capable of being transcribed.
- Expression vectors can contain a variety of control sequences, structural genes (e.g., genes of interest), and nucleic acid sequences that serve other functions as well.
- vector is meant a DNA molecule, usually derived from a plasmid or
- a recombinant vector will contain one or more unique restriction sites, and may be capable of autonomous replication in a defined host or vehicle organism such that the cloned sequence is reproducible.
- a vector contains a promoter operably linked to a gene or coding region such that, upon transfection into a recipient cell, an RNA is expressed.
- An "AAV vector” as used herein refers to a vector comprising one or more polynucleotides of interest (or transgenes) that are flanked by AAV terminal repeat sequences (ITRs). Such AAV vectors can be replicated and packaged into infectious viral particles when present in a host cell that has been transfected with a vector encoding and expressing rep and cap gene products.
- ITRs AAV terminal repeat sequences
- An "AAV virion” or “AAV viral particle” or “AAV vector particle” refers to a viral particle composed of at least one AAV capsid protein and an encapsidated polynucleotide AAV vector. If the particle comprises a heterologous polynucleotide (i.e. a polynucleotide other than a wild-type AAV genome such as a transgene to be delivered to a mammalian cell), it is typically referred to as an "AAV vector particle” or simply an "AAV vector”. Thus, production of AAV vector particle necessarily includes production of AAV vector, as such a vector is contained within an AAV vector particle.
- a heterologous polynucleotide i.e. a polynucleotide other than a wild-type AAV genome such as a transgene to be delivered to a mammalian cell
- the present invention provides methods of treating a subject having muscular atrophy using gene therapy.
- Vectors which can be used to deliver a therapeutic nucleic acid include viral and non- viral vectors. Suitable vectors which can be used include adenovirus, adeno-associated virus, retrovirus, lentivirus, HSV (herpes simplex virus) and plasmids.
- adenovirus adeno-associated virus
- retrovirus retrovirus
- lentivirus lentivirus
- HSV herpes simplex virus
- plasmids An advantage of Herpes simplex virus vectors is their natural tropism for sensory neurons.
- adenovirus associated viral vectors are most popular, due to their low risk of insertional mutagenesis and immunogenicity, their lack of endogenous viral genes, and their ability to be produced at high titer. Kantor et al. review a variety of methods of gene transfer to the central nervous system, while Goins et al.
- Nucleic acids can be administered in any desired format that provides sufficiently efficient delivery levels, including in virus particles, in liposomes, in nanoparticles, and complexed to polymers.
- the nucleic acid e.g., cDNA or transgene
- the nucleic acid encoding a gene whose expression decreases peripheral neuropathy can be cloned into an expression cassette that has a regulatory element such as a promoter (constitutive or regulatable) to drive transgene expression and a polyadenylation sequence downstream of the nucleic acid.
- a regulatory element such as a promoter (constitutive or regulatable) to drive transgene expression and a polyadenylation sequence downstream of the nucleic acid.
- regulatory elements that are 1) specific to a tissue or region of the body; 2) constitutive; and/or 3) inducible/regulatable can be used.
- muscle-specific regulatory elements include muscle-specific promoters including mammalian muscle creatine kinase (MCK) promoter, mammalian desmin promoter, mammalian troponin I (TNNI2) promoter, or mammalian skeletal alpha-actin (ASKA) promoter.
- Muscle-specific enhancers useful in the present invention are selected from the group consisting of mammalian MCK enhancer, mammalian DES enhancer, and vertebrate troponin I IRE (TNI IRE, herein after referred to as FIRE) enhancer.
- FIRE vertebrate troponin I IRE
- One or more of these muscle-specific enhancer elements may be used in combination with a muscle- specific promoter of the invention to provide a tissue- specific regulatory element.
- a preferred vector for use in treating muscular atrophy by gene therapy is AAV.
- AAV-mediated gene delivery has emerged as an effective and safe tool for both preclinical and clinical studies of neurological disorders. Ojala et al., Neuroscientist., 21(l):84-98 (2015).
- Adeno- associated virus is a non-pathogenic dependovirus from the parvoviridae family requiring helper functions from other viruses, such as adenovirus or herpes simplex virus, to fulfill its life cycle.
- the wild-type (WT) AAV is characterized by a single-stranded DNA (ssDNA) genome, with inverted terminal repeats (ITR) at both ends, of approximately 5 kb surrounded by a capsid.
- Adenoviral vectors for use to deliver transgenes to cells for applications such as in vivo gene therapy and in vitro study and/or production of the products of transgenes commonly are derived from adenoviruses by deletion of the early region 1 (El) genes (Berkner, K. L., Curr. Top. Micro. Immunol. 158 L39-66 1992). Deletion of El genes renders such adenoviral vectors replication defective and significantly reduces expression of the remaining viral genes present within the vector.
- El early region 1
- Recombinant adenoviral vectors have several advantages for use as gene delivery vehicles, including tropism for both dividing and non-dividing cells, minimal pathogenic potential, ability to replicate to high titer for preparation of vector stocks, and the potential to carry large inserts. However, it is believed that the presence of the remaining viral genes in adenoviral vectors can be deleterious.
- adenoviral vectors with deletions of various adenoviral gene sequences are adenoviral vectors derived from the genome of an adenovirus that contain minimal cis-acting nucleotide sequences required for the replication and packaging of the vector genome and which can contain one or more transgenes (See, U.S. Pat. No. 5,882,877 which covers pseudoadenoviral vectors (PAV) and methods for producing PAV, incorporated herein by reference).
- PAVs which can accommodate up to about 36 kb of foreign nucleic acid, are advantageous because the carrying capacity of the vector is optimized, while the potential for host immune responses to the vector or the generation of replication-competent viruses is reduced.
- PAV vectors contain the 5' inverted terminal repeat (ITR) and the 3' ITR nucleotide sequences that contain the origin of replication, and the cis acting nucleotide sequence required for packaging of the PAV genome, and can accommodate one or more transgenes with appropriate regulatory elements, e.g. promoter, enhancers, etc.
- Recombinant AAV genomes of the invention comprise nucleic acid molecule of the invention and one or more AAV ITRs flanking a nucleic acid molecule.
- AAV DNA in the rAAV genomes may be from any AAV serotype for which a recombinant virus can be derived including, but not limited to, AAV serotypes AAV-1, AAV-2, AAV-3, AAV-4, AAV-5, AAV-6, AAV-7, AAV-8, AAV-9, AAV-10, AAV-11, AAV-12 and AAV-13 (see, e.g., Gao et al., PNAS, 99: 11854-11859 ((2002); and Viral Vectors for Gene Therapy: Methods and Protocols, ed.
- pseudotyped AAV vectors may also be utilized in the methods described herein.
- Pseudotyped AAV vectors are those which contain the genome of one AAV serotype in the capsid of a second AAV serotype; for example, an AAV vector that contains the AAV2 capsid and the AAV1 genome or an AAV vector that contains the AAV5 capsid and the AAV 2 genome.
- Production of pseudotyped rAAV is disclosed in, for example, WO 01/83692.
- rAAV variants for example rAAV with capsid mutations
- rAAV with capsid mutations are also contemplated. See, for example, Marsic et al., Molecular Therapy, 22(11): 1900-1909 (2014).
- nucleotide sequences of the genomes of various AAV serotypes are known in the art.
- AAV1, AAV6, AAV8 or AAVrh.74 may be used.
- DNA plasmids of the invention comprise rAAV genomes of the invention.
- the DNA plasmids are transferred to cells permissible for infection with a helper virus of AAV (e.g., adenovirus, El-deleted adenovirus or herpes virus) for assembly of the rAAV genome into infectious viral particles.
- helper virus of AAV e.g., adenovirus, El-deleted adenovirus or herpes virus
- rAAV Production of rAAV requires that the following components are present within a single cell (denoted herein as a packaging cell): a rAAV genome, AAV rep and cap genes separate from (i.e., not in) the rAAV genome, and helper virus functions.
- the AAV rep and cap genes may be from any AAV serotype for which recombinant virus can be derived and may be from a different AAV serotype than the rAAV genome ITRs, including, but not limited to, AAV serotypes AAV-1, AAV-2, AAV-3, AAV-4, AAV-5, AAV-6, AAV-7, AAVrh.74, AAV-8, AAV-9, AAV- 10, AAV- 11, AAV- 12 and AAV-13.
- Production of pseudotyped rAAV is disclosed in, for example, WO 01/83692 which is incorporated by reference herein in its entirety.
- a method of generating a packaging cell is to create a cell line that stably expresses all the necessary components for AAV particle production.
- a plasmid or multiple plasmids
- a plasmid comprising a rAAV genome lacking AAV rep and cap genes, AAV rep and cap genes separate from the rAAV genome, and a selectable marker, such as a neomycin resistance gene, are integrated into the genome of a cell.
- AAV genomes have been introduced into bacterial plasmids by procedures such as GC tailing (Samulski et al., 1982, Proc. Natl. Acad. S6.
- the packaging cell line is then infected with a helper virus such as adenovirus.
- a helper virus such as adenovirus.
- packaging cells that produce infectious rAAV.
- packaging cells may be stably transformed cancer cells such as HeLa cells, 293 cells and PerC.6 cells (a cognate 293 line).
- packaging cells are cells that are not transformed cancer cells, such as low passage 293 cells (human fetal kidney cells transformed with El of adenovirus), MRC-5 cells (human fetal fibroblasts), WI-38 cells (human fetal fibroblasts), Vero cells (monkey kidney cells) and FRhL-2 cells (rhesus fetal lung cells).
- Recombinant AAV i.e., infectious encapsidated rAAV particles
- Recombinant AAV i.e., infectious encapsidated rAAV particles
- the genomes of both rAAV lack AAV rep and cap DNA, that is, there is no AAV rep or cap DNA between the ITRs of the genomes.
- Examples of rAAV that may be constructed to comprise the nucleic acid molecules of the invention are set out in International Patent Application No. PCT/US2012/047999 (WO
- the rAAV may be purified by methods standard in the art such as by column chromatography or cesium chloride gradients. Methods for purifying rAAV vectors from helper virus are known in the art and include methods disclosed in, for example, Clark et al., Hum. Gene Ther., 10(6): 1031-1039 (1999); Schenpp and Clark, Methods Mol. Med., 69 427-443 (2002); U.S. Patent No. 6,566,118 and WO 98/09657. [00143] In another embodiment, the invention contemplates compositions comprising rAAV of the present invention. Compositions of the invention comprise rAAV and a pharmaceutically acceptable carrier.
- compositions may also comprise other ingredients such as diluents and adjuvants.
- Acceptable carriers, diluents and adjuvants are nontoxic to recipients and are preferably inert at the dosages and concentrations employed, and include buffers such as phosphate, citrate, or other organic acids; antioxidants such as ascorbic acid; low molecular weight polypeptides; proteins, such as serum albumin, gelatin, or immunoglobulins; hydrophilic polymers such as polyvinylpyrrolidone; amino acids such as glycine, glutamine, asparagine, arginine or lysine; monosaccharides, disaccharides, and other carbohydrates including glucose, mannose, or dextrins; chelating agents such as EDTA; sugar alcohols such as mannitol or sorbitol; salt-forming counter ions such as sodium; and/or nonionic surfactants such as Tween, pluronics or polyethylene glycol (PEG).
- buffers
- Titers of rAAV to be administered in methods of the invention will vary depending, for example, on the particular rAAV, the mode of administration, the treatment goal, the individual, and the cell type(s) being targeted, and may be determined by methods standard in the art. Titers of rAAV may range from about lxlO 6 , about lxlO 7 , about 1x10 s , about lxlO 9 , about lxlO 10 , about lxlO 11 , about lxlO 12 , about lxl0 13 to about lxlO 14 or more DNase resistant particles (DRP) per ml. Dosages may also be expressed in units of viral genomes (vg).
- Methods of transducing a target cell with rAAV, in vivo or in vitro are contemplated by the invention.
- the in vivo methods comprise the step of administering an effective dose, or effective multiple doses, of a composition comprising a rAAV of the invention to an animal (including a human being) in need thereof. If the dose is administered prior to development of a disorder/disease, the administration is prophylactic. If the dose is administered after the development of a disorder/disease, the administration is therapeutic.
- an effective dose is a dose that alleviates (eliminates or reduces) at least one symptom associated with the disorder/disease state being treated, that slows or prevents progression to a disorder/disease state, that slows or prevents progression of a disorder/disease state, that diminishes the extent of disease, that results in remission (partial or total) of disease, and/or that prolongs survival.
- rAAV of the present invention may be accomplished by using any physical method that will transport the rAAV recombinant vector into the target tissue of an animal.
- Administration according to the invention includes, but is not limited to, injection into muscle, the bloodstream and/or directly into the liver. Simply resuspending a rAAV in phosphate buffered saline has been demonstrated to be sufficient to provide a vehicle useful for muscle tissue expression, and there are no known restrictions on the carriers or other components that can be co-administered with the rAAV (although compositions that degrade DNA should be avoided in the normal manner with rAAV).
- Capsid proteins of a rAAV may be modified so that the rAAV is targeted to a particular target tissue of interest such as muscle. See, for example, WO 02/053703, the disclosure of which is incorporated by reference herein.
- Pharmaceutical compositions can be prepared as injectable formulations or as topical formulations to be delivered to the muscles by transdermal transport. Numerous formulations for both intramuscular injection and transdermal transport have been previously developed and can be used in the practice of the invention.
- the rAAV can be used with any pharmaceutically acceptable carrier for ease of administration and handling.
- Transduction may be carried out with gene cassettes comprising tissue specific control elements.
- tissue specific control elements including, but not limited to, those derived from the actin and myosin gene families, such as from the myoD gene family [See Weintraub et ah, Science, 251: 761-766 (1991)], the myocyte- specific enhancer binding factor MEF-2 [Cserjesi and Olson, Mol Cell Biol 11: 4854-4862 (1991)], control elements derived from the human skeletal actin gene [Muscat et ah, Mol Cell Biol, 7: 4089-4099 (1987)], the cardiac actin gene, muscle creatine kinase sequence elements [See Johnson et ah, Mol Cell Biol, 9:3393-3399 (1989)] and the murine creatine kinase enhancer (mCK) element, control elements derived from the skeletal fast-twitch trop
- mCK murine creatine kinase enhancer
- Muscle tissue is an attractive target for in vivo DNA delivery, because it is not a vital organ and is easy to access.
- the invention contemplates sustained expression of miRNAs from transduced myofibers.
- muscle cell or “muscle tissue” is meant a cell or group of cells derived from muscle of any kind (for example, skeletal muscle and smooth muscle, e.g. from the digestive tract, urinary bladder, blood vessels or cardiac tissue).
- muscle cells may be differentiated or undifferentiated, such as myoblasts, myocytes, myotubes, cardiomyocytes and
- transduction is used to refer to the administration/delivery of the coding region of NT-3 to a recipient cell either in vivo or in vitro, via a replication-deficient rAAV of the invention resulting in expression of NT-3 by the recipient cell.
- the gene therapy is NT-3 gene therapy via recombinant adeno- associated virus (AAV) delivery.
- AAV adeno- associated virus
- the inventors developed an AAV expression cassette carrying human NT-3 cDNA coding sequence under the control of either the CMV promoter or triple muscle- specific creatine kinase (tMCK) promoter.
- the inventors have previously shown that an improvement in motor function, histopathology, and electrophysiology of peripheral nerves can be achieved using the recombinant AAV1 vector to increase neurotrophin-3 expression in the tremble (Try) mouse, which is a model for the Charcot-Marie-Tooth disease variant CMT1A. See Sahenk et al., Mol Ther. 22(3):511-21 (2014), the disclosure of which is incorporated herein by reference.
- the invention provides methods of administering an effective dose (or doses, administered essentially simultaneously or doses given at intervals) of rAAV that encode NT-3 to a patient in need thereof.
- the invention provides for local administration and systemic administration of an effective dose of rAAV and compositions of the invention including combination therapy of the invention.
- systemic administration is administration into the circulatory system so that the entire body is affected.
- Systemic administration includes enteral administration such as absorption through the gastrointestinal tract and parental administration through injection, infusion or implantation.
- Routes of administration for the rAAV contemplated in the foregoing methods therefore include, but are not limited to, intraperitoneal (IP), intramuscular (IM) and intravascular [including, for example, inter-arterial limb perfusion (ILP) and intravenous (IV) routes.
- IP intraperitoneal
- IM intramuscular
- ILP inter-arterial limb perfusion
- IV intravenous
- the dose of rAAV to be administered in methods disclosed herein will vary depending, for example, on the particular rAAV, the mode of administration, the treatment goal, the individual, and the cell type(s) being targeted, and may be determined by methods standard in the art. More than one dose may be administered, for example, one, two, three or more doses.
- Titers of rAAV in a dose may range from about lxlO 6 , about lxlO 7 , about 1x10 s , about lxlO 9 , about lxlO 10 , about lxl 11 , about lxlO 12 , about 1.5xl0 12 , about lxlO 12 , about 3xl0 12 , about 4xl0 12 , about 5xl0 12 , about 6xl0 12 , about 6.5 xlO 12 , about 7xl0 12 , lxlO 13 , about lxlO 14 , or to about lxlO 15 or more DNase resistant particles (DRP) per ml. Dosages may also be expressed in
- vg i.e., 1x10 vg, 1x10 vg, 1x10 vg, 1x10 vg, 1x10 vg, 1x10 vg, 1x10 vg, about 1.5xl0 12 vg, about lxl0 12 vg, about 3xl0 12 vg, about 4xl0 12 vg, about 5xl0 12 vg, about 6xl0 12 vg, about 6.5 xl0 12 vg, about 7xl0 12 vg, lxlO 13 vg, lxl0 14 vg, lxlO 15 respectively).
- vg viral genomes
- the dose of the rAAV administered is from about 1.5x10 12 to at least about
- the administered is 2x10 12 vg/kg. In some embodiments of the foregoing methods in which the route of administration is IM, the dose of the rAAV administered is 4x10 12 vg/kg. In some embodiments of the foregoing methods in which the route of administration is IM, the dose of the rAAV administered is 4x10 12 vg/kg. In some embodiments of the foregoing methods in which the route of administration is IM, the dose of the rAAV administered is 4x10 12 vg/kg. In some
- the dose of the rAAV administered is 6x10 12 vg/kg.
- Human patients are subjects contemplated herein for treatment.
- Human patients are subjects contemplated herein for treatment by IM delivery.
- Such patients include those patients that, e.g.: i) adult subjects (>18 years) diagnosed with CMTIA, ii) exhibit a 1.5 Mb duplication at 17pl 1.2 inclusive of the peripheral myelin protein 22 (PMP22) gene, iii) males and females of any ethnic or racial group, iv) exhibit weakness of the ankle dorsiflexion muscle (should have full ROM against gravity but cannot maintain full dorsiflexion against gravity or able to stand heels 3 seconds or greater (Northstar criteria)), iv) abnormal nerve conduction velocities, v) ability to cooperate for clinical evaluation and repeat nerve conduction studies, and vi) willingness of sexually active subjects to practice a reliable method of contraception during the study.
- PMP22 peripheral myelin protein 22
- Suitable patients may not include, e.g., those with i) active viral infection based on clinical observations or serological evidence of HIV, or Hepatitis A, B or C infection, ii) ongoing immunosuppressive therapy or immunosuppressive therapy within 6 months of starting the trial (e.g., corticosteroids, cyclosporine, tacrolimus, methotrexate, cyclophosphamide, intravenous immunoglobulin), iii) persistent leukopenia or leukocytosis (WBC ⁇ 3.5 KJ ⁇ L ⁇ or > 20.0 ⁇ / ⁇ ) or an absolute neutrophil count ⁇ 1.5 ⁇ / ⁇ ⁇ , iv) AAV1 binding antibody titers > 1 :50 as determined by ELISA immunoassay, v) concomitant illness or requirement for chronic drug treatment that in the opinion of the PI creates unnecessary risks for gene transfer, vi) ankle contractures or surgeries preventing proper muscle strength testing, vii) pregnancy, breast feeding, or plans to become
- CMT1A patients receive a total dose of vector scAAVl .tMCK.NTF3 divided into medial and lateral heads of the gastrocnemius and tibialis anterior (TA) muscles of legs which are preferentially causing ankle weakness and
- total dose or ii) a high dose of vector of 6x10 vg/kg (total dose).
- the vector is administered by IM injection without diluent.
- compositions for intramuscular injection incude an adjuvant such as sesame or peanut oil or in aqueous propylene glycol can be employed, as well as sterile aqueous solutions.
- aqueous solutions can be buffered, if desired, and the liquid diluent first rendered isotonic with saline or glucose.
- Solutions of rAAV as a free acid (DNA contains acidic phosphate groups) or a pharmacologically acceptable salt can be prepared in water suitably mixed with a surfactant such as hydroxpropylcellulose.
- a dispersion of rAAV can also be prepared in glycerol, liquid polyethylene glycols and mixtures thereof and in oils. Under ordinary conditions of storage and use, these preparations contain a preservative to prevent the growth of microorganisms.
- the sterile aqueous media employed are all readily obtainable by standard techniques well-known to those skilled in the art.
- the pharmaceutical carriers, diluents or excipients suitable for injectable use include sterile aqueous solutions or dispersions and sterile powders for the extemporaneous preparation of sterile injectable solutions or dispersions.
- the form must be sterile and must be fluid to the extent that easy syringability exists. It must be stable under the conditions of manufacture and storage and must be preserved against the contaminating actions of microorganisms such as bacteria and fungi.
- the carrier can be a solvent or dispersion medium containing, for example, water, ethanol, polyol (for example, glycerol, propylene glycol, liquid polyethylene glycol and the like), suitable mixtures thereof, and vegetable oils.
- the proper fluidity can be maintained, for example, by the use of a coating such as lecithin, by the maintenance of the required particle size in the case of a dispersion and by the use of surfactants.
- the prevention of the action of microorganisms can be brought about by various antibacterial and antifungal agents, for example, parabens, chlorobutanol, phenol, sorbic acid, thimerosal and the like. In many cases it will be preferable to include isotonic agents, for example, sugars or sodium chloride.
- Prolonged absorption of the injectable compositions can be brought about by use of agents delaying absorption, for example, aluminum monostearate and gelatin.
- Sterile injectable solutions are prepared by incorporating rAAV in the required amount in the appropriate solvent with various other ingredients enumerated above, as required, followed by filter sterilization.
- dispersions are prepared by incorporating the sterilized active ingredient into a sterile vehicle which contains the basic dispersion medium and the required other ingredients from those enumerated above.
- the preferred methods of preparation are vacuum drying and the freeze drying technique that yield a powder of the active ingredient plus any additional desired ingredient from the previously sterile-filtered solution thereof.
- Transduction with rAAV may also be carried out in vitro.
- desired target muscle cells are removed from the subject, transduced with rAAV and
- syngeneic or xenogeneic muscle cells can be used where those cells will not generate an inappropriate immune response in the subject.
- rAAV genomes are provided herein.
- the genomes of the rAAV administered comprise a NT-3 polynucleotide under the control of transcription control sequences.
- the rAAV genomes lack AAV rep and cap DNA.
- AAV DNA in the rAAV genomes may be from any AAV serotype for which a recombinant virus can be derived including, but not limited to, AAV serotypes AAV-1, AAV-2, AAV-3, AAV-4, AAV-5, AAV-6, AAV-7, AAV-8, AAV-9, AAV- 10, AAV- 11 and AAVrh.74.
- the nucleotide sequences of the genomes of these AAV serotypes are known in the art as noted in the Background Section above.
- the transcription control sequences of the rAAV genomes are muscle- specific control elements, including, but not limited to, those derived from the actin and myosin gene families, such as from the myoD gene family [See Weintraub et al., Science, 251: 761-766 (1991)], the myocyte- specific enhancer binding factor MEF-2 [Cserjesi and Olson, Mol. Cell. Biol., 11: 4854-4862 (1991)], control elements derived from the human skeletal actin gene [Muscat et al., Mol. Cell.
- desmin promoter control elements derived from the skeletal fast-twitch troponin C gene, the slow-twitch cardiac troponin C gene and the slow-twitch troponin I gene: hypozia-inducible nuclear factors (Semenza et al., Proc. Natl. Acad. Sci. USA, 88: 5680-5684 (1991)), steroid-inducible elements and promoters including the glucocorticoid response element (GRE) (See Mader and White, Proc. Natl. Acad. Sci. USA, 90: 5603-5607 (1993)), and other control elements.
- the transcription control elements include the MCK promoter.
- the transcription control elements include the MHCK7 promoter.
- the NT-3 polynucleotide in a rAAV genome is the NT-3 cDNA set out in SEQ ID NO: 1 (corresponding to nucleotides 1077-1850 of SEQ ID NO: 11).
- the NT-3 polynucleotide in a rAAV genome is the NT-3 cDNA set out in Genbank Accession # NM_001102654 or the NT-3 cDNA sequence set out as SEQ ID NO: 1, or is a variant polynucleotide having 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% sequence identity to the NT-3 cDNA.
- the variant NT-3 polynucleotide encodes the same NT-3 polypeptide as the polypeptide encoded by NT-3 cDNA of SEQ ID NO: 1.
- the amino acid sequence of the NT- 3 polypeptide encoded by the NT-3 cDNA set out as SEQ ID NO: 1 or provided as Genbank Accession # NM_001102654 is set out in SEQ ID NO:2.
- the variant NT- 3 polynucleotide encodes a variant NT-3 polypeptide with at least one amino acid sequence alteration as compared to the amino acid sequence of the polypeptide (SEQ ID NO: 2) encoded by NT-3 cDNA set out in SEQ ID NO: 1 or provided as Genbank Accession # NM_001102654.
- An amino acid sequence alteration can be, for example, a substitution, a deletion, or an insertion of one or more amino acids, preferably conservative substitutions.
- a variant NT-3 polypeptide can have any combination of amino acid substitutions, deletions or insertions where activity of the polypeptide is retained.
- a variant NT-3 polypeptide can have a number of amino acid alterations such that its amino acid sequence shares at least 60, 70, 80, 85, 90, 95, 97, 98, 99 or 99.5% identity with the amino acid sequence (SEQ ID NO: 2) encoded by NT-3 cDNA set out as SEQ ID NO: 1 or provided as Genbank Accession # NM_001102654.
- the rAAV genome is the AAV.tMCK.NTF3 genome, the sequence of the NT-3 gene cassette of which is set out in SEQ ID NO: 11 and is annotated in Table 4 (see Example 3).
- an isolated nucleic acid comprising the nucleotide sequence depicted in SEQ ID NO: 11 is provided.
- the isolated nucleic acid consists of the nucleotide sequence depicted in SEQ ID NO: 11.
- an isolated nucleic acid comprising, in order from 5' to 3': (i) a first AAV2 inverted terminal repeat sequence (ITR) (SEQ ID NO: 4); (ii) a muscle creatine kinase promoter sequence (SEQ ID NO: 3); (iii) a nucleotide sequence encoding a human NT-3 polypeptide (SEQ ID NO: 1); and (iv) a second AAV2 ITR sequence (SEQ ID NO: 8), wherein the human NT-3 polypeptide has an amino acid sequence that is at least 90% identical to SEQ ID NO: 2, is 100% identical to SEQ ID NO:2, or is encoded by nucleotides 1077-1850 of SEQ ID NO: 11.
- Recombinant AAV comprising the foregoing nucleic acids are contemplated as well as rAAV comprising a nucleotide sequence that is at least 90% identical to the nucleotide sequence depicted in SEQ ID NO: 1.
- DNA plasmids comprising rAAV genomes of the disclosure are provided.
- the DNA plasmids comprise rAAV genomes contemplated herein.
- the DNA plasmids are transferred to cells permissible for infection with a helper virus of AAV (e.g., adenovirus, El-deleted adenovirus or herpesvirus) for assembly of the rAAV genome into infectious viral particles.
- helper virus of AAV e.g., adenovirus, El-deleted adenovirus or herpesvirus
- Techniques to produce rAAV particles, in which an AAV genome to be packaged, rep and cap genes, and helper virus functions are provided to a cell are standard in the art.
- rAAV genome a rAAV genome
- AAV rep and cap genes separate from (i.e., not in) the rAAV genome
- helper virus functions The AAV rep and cap genes may be from any AAV serotype for which recombinant virus can be derived and may be from a different AAV serotype than the rAAV genome ITRs, including, but not limited to, AAV serotypes AAV-1, AAV-2, AAV-3, AAV-4, AAV-5, AAV-6, AAV-7, AAV-8, AAV-9, AAV- 10, AAV-11 and AAV rh74.
- rAAV Production of pseudotyped rAAV is disclosed in, for example, WO 01/83692.
- Other types of rAAV variants for example rAAV with capsid mutations, are also contemplated. See, for example, Marsic et al, Molecular Therapy, 22(11): 1900-1909 (2014).
- a method of generating a packaging cell is to create a cell line that stably expresses all the necessary components for AAV particle production.
- a plasmid (or multiple plasmids) comprising a rAAV genome lacking AAV rep and cap genes, AAV rep and cap genes separate from the rAAV genome, and a selectable marker, such as a neomycin resistance gene, are integrated into the genome of a cell.
- AAV genomes have been introduced into bacterial plasmids by procedures such as GC tailing (Samulski et al., 1982, Proc. Natl. Acad. S6.
- the packaging cell line is then infected with a helper virus such as adenovirus.
- a helper virus such as adenovirus.
- the advantages of this method are that the cells are selectable and are suitable for large-scale production of rAAV.
- Other examples of suitable methods employ adenovirus or baculovirus rather than plasmids to introduce rAAV genomes and/or rep and cap genes into packaging cells. Methods for producing rAAV with self-complementary genomes are also known in the art.
- packaging cells that produce infectious rAAV.
- packaging cells may be stably transformed cancer cells such as HeLa cells, 293 cells and PerC.6 cells (a cognate 293 line).
- packaging cells are cells that are not transformed cancer cells, such as low passage 293 cells (human fetal kidney cells transformed with El of adenovirus), MRC-5 cells (human fetal fibroblasts), WI-38 cells (human fetal fibroblasts), Vero cells (monkey kidney cells) and FRhL-2 cells (rhesus fetal lung cells).
- low passage 293 cells human fetal kidney cells transformed with El of adenovirus
- MRC-5 cells human fetal fibroblasts
- WI-38 cells human fetal fibroblasts
- Vero cells monkey kidney cells
- FRhL-2 cells rhesus fetal lung cells
- the rAAV may be purified by methods standard in the art such as by column chromatography or cesium chloride gradients. Methods for purifying rAAV vectors from helper virus are known in the art and include methods disclosed in, for example, Clark et al., Hum. Gene Ther., 10(6): 1031-1039 (1999); Schenpp and Clark, Methods Mol. Med., 69 427-443 (2002); U.S. Patent No. 6,566,118 and WO 98/09657.
- the disclosure contemplates a rAAV comprising a NT-3 polynucleotide.
- the rAAV comprises AAV rh74 capsid and a NT-3 polynucleotide.
- the genome of the rAAV lacks AAV rep and cap DNA.
- the rAAV is rAAVrh7.4.tMCK.NTF3.
- the rAAV is a self-complementary genome.
- compositions comprising a rAAV described herein.
- Compositions of the disclosure comprise rAAV in a pharmaceutically acceptable carrier.
- the compositions may also comprise other ingredients such as diluents.
- Acceptable carriers and diluents are nontoxic to recipients and are preferably inert at the dosages and concentrations employed, and include buffers such as phosphate, citrate, or other organic acids; antioxidants such as ascorbic acid; low molecular weight polypeptides; proteins, such as serum albumin, gelatin, or immunoglobulins; hydrophilic polymers such as
- polyvinylpyrrolidone amino acids such as glycine, glutamine, asparagine, arginine or lysine; monosaccharides, disaccharides, and other carbohydrates including glucose, mannose, or dextrins; chelating agents such as EDTA; sugar alcohols such as mannitol or sorbitol; salt- forming counterions such as sodium; and/or nonionic surfactants such as Tween, pluronics or polyethylene glycol (PEG).
- the rAAV is formulated in Tris, MgCl 2, NaCl and pluronic F68.
- the rAAV is formulated in 20 mM Tris (pH 8.0), 1 mM MgCl 2 and 200 mM NaCl containing 0.001% pluronic F68.
- Combination treatments are also contemplated herein. Combinations as used herein include simultaneous treatment or sequential treatments. Combinations of methods of the disclosure with standard medical treatments (e.g., corticosteroids and/or immunosuppressive drugs) are specifically contemplated, as are combinations with novel treatments. In various embodiments, subjects are treated with corticosteroids before, during or after (or with any permutation of combinations of two or more of the three possibilities), the subject is treated according to a method contemplated herein. For example, the combinations include
- a corticosteroid e.g. prednisolone
- a corticosteroid e.g. prednisolone
- Sterile injectable solutions are prepared by incorporating rAAV in the required amount in the appropriate solvent with various other ingredients enumerated above, as required, followed by filter sterilization.
- dispersions are prepared by incorporating the sterilized active ingredient into a sterile vehicle which contains the basic dispersion medium and the required other ingredients from those enumerated above.
- the preferred methods of preparation are vacuum drying and the freeze drying technique that yield a powder of the active ingredient plus any additional desired ingredient from the previously sterile-filtered solution thereof.
- One aspect of the invention provides a method of stimulating muscle growth in a subject, comprising administering a therapeutically effective amount of neurotrophin-3 (NT-3), pro-NT-3, or an effective fragment thereof, or a nucleic acid encoding NT-3, pro-NT-3, or an effective fragment thereof; to a subject in need thereof
- NT-3 neurotrophin-3
- pro-NT-3 or an effective fragment thereof
- nucleic acid encoding NT-3, pro-NT-3, or an effective fragment thereof
- the methods of the invention may be used to increase muscle strength, muscle mass, or muscle endurance and decrease muscle fatigue in a subject.
- Muscle can be divided into three types: skeletal muscle, cardiac muscle, and smooth muscle.
- Skeletal muscle is muscle tissue capable of generating force and transferring that force to the skeleton enables breathing, movement, and posture maintenance.
- Cardiac muscle is muscle of the heart.
- Smooth muscle is muscle tissue of the arterial and bowel walls. The methods and compositions of the present invention apply primarily to skeletal muscle and, but may additionally positively affect smooth muscles.
- "Skeletal muscle” and "skeletal muscles” are defined as muscles with interactions with bones, tendons, and joints.
- the present invention provides a method of treatment of illnesses, diseases, disorders, and conditions that cause a decrease in muscle strength (also referred to herein as musculoskeletal diseases, and as muscle dysfunction and muscle-wasting diseases).
- muscle strength also referred to herein as musculoskeletal diseases, and as muscle dysfunction and muscle-wasting diseases.
- the main categories of musculoskeletal diseases are muscular dystrophies and muscular atrophy.
- the invention provides methods for the treatment of musculoskeletal diseases, including muscle dysfunction and muscle-wasting diseases or disorders, including hereditary myopathy, neuromuscular disease, muscular atrophy, drug- induced, myopathy, or an illness, disease, disorder or condition that causes a decrease in muscle strength.
- the invention also provides for methods for the treatment of neuropathies such as CMT-hereditary and CMT1A, as well as axonal and demyelinating polyneuropathies such as chronic inflammatory demyelinating polyneuropathy.
- the method of treatment includes administering to a patient in need thereof a therapeutically effective amount of neurotrophin-3 (NT-3), pro-NT-3, or an effective fragment thereof, or a nucleic acid encoding NT-3, pro-NT-3, or an effective fragment thereof.
- the subject has a muscle disease selected from the group consisting of sarcopenia, cachexia, type II muscle fiber atrophy and acquired autoimmune primary muscle disorders associated with impaired radial growth phase of regeneration.
- NT-3 can be used to treat muscular atrophy.
- Muscular atrophy is a general term used to describe a condition marked by the wasting or loss muscle tissue resulting from a variety of diseases, disorders, other conditions, or events.
- Muscle atrophies can be the result of, but are not limited to, protracted immobilization resulting from recovery from severe burns, major joint replacement surgery, neuropathic pain, peripheral neuropathy, necrotizing vasculitis, zero gravity environment (e.g., astronauts and cosmonauts), extended hospitalization, degenerative disease (e.g., amyotrophic lateral sclerosis) and organ transplant as well as spinal cord injury, chronic hemodialysis, and stroke.
- degenerative disease e.g., amyotrophic lateral sclerosis
- organ transplant as well as spinal cord injury, chronic hemodialysis, and stroke.
- NT-3 can be used to treat disuse muscular atrophy.
- Disuse muscular atrophy is a condition marked by the wasting or loss muscle tissue resulting from long periods of inactivity.
- Disuse muscular atrophy can be result of, but are not limited to, protracted immobilization resulting from recovery from severe burns, major joint replacement surgery, neuropathic pain, zero gravity environment (e.g., astronauts and cosmonauts), extended hospitalization, anorexia, and. organ transplant as well as spinal cord injury, chronic hemodialysis, and stroke.
- NT-3 can be used to treat age-related muscular atrophy.
- Age- related muscular atrophy is a condition marked by the wasting or loss muscle tissue and the replacement of muscle tissue with fibrosis tissue as the subject ages.
- NT-3 can be used to treat sarcopenia.
- Sarcopenia is a condition marked by the wasting or loss muscle tissue and the replacement of muscle tissue with fibrosis tissue as the subject ages.
- NT-3 can be used to treat the muscle wasting in cachexia.
- Cachexia is loss of weight, muscle atrophy, fatigue, weakness and significant loss of appetite in someone who is not actively trying to lose weight, but rather as the result of chronic disease.
- the muscle wasting component of cachexia can be result of, but are not limited to, cancer, multiple sclerosis, tuberculosis, acquired immune deficiency syndrome, human immunodeficiency virus, malnutrition, Parkinson's disease, emphysema, heart failure, motor neuron disease, cystic fibrosis, dementia, sarcopenia, chronic obstructive pulmonary disease, kidney disease, and kidney failure.
- NT-3 can be used to treat muscle wasting resulting from viral infections (e.g., HIV, Epstein-Barr virus), bacterial infections (e.g., mycobacteria and rickettsia), post-polio syndrome, and parasitic infection (e.g., trypanosomes and schistosome) wherein the subject is at risk of developing muscle atrophy.
- viral infections e.g., HIV, Epstein-Barr virus
- bacterial infections e.g., mycobacteria and rickettsia
- post-polio syndrome e.g., a parasitic infection
- parasitic infection e.g., trypanosomes and schistosome
- a therapeutically effective amount of NT-3, pro-NT-3, or an NT-3 analog thereof is administered to the subject to stimulate muscle growth.
- Neurotrophin 3 is a neurotrophic factor in the NGF (Nerve Growth Factor) family of neurotrophins.
- NT- 3 is a protein growth factor which has activity on certain neurons of the peripheral and central nervous system; it is best known for helping to support the survival and differentiation of existing neurons, and encourages the growth and differentiation of new neurons and synapses.
- the disclosure includes blocking peptides that are substantially similar to at least a portion of the amino acid sequence of an extracellular domain of Cx26.
- the term "a portion,” as used herein, refers to an amino acid sequence within the extracellular domains of Cx26 that includes at least 4 amino acids.
- a portion refers to an amino acid sequence that is at least 6 amino acids in length, an amino acid sequence that is at least 8 amino acids in length, or an amino acid sequence that is at least 10 amino acids in length.
- the blocking peptides therefore consist of at least 4, 6, 8, or 10 amino acids.
- the blocking peptides described herein can have a maximum size.
- the maximum size of the blocking peptide relates to the overall size of the peptide, and includes any additional sequences linked to the peptide, such as a protein transduction domain.
- the blocking peptide has a maximum size of less than about 200 amino acids, while in other embodiments the blocking peptide has a maximum size of less than about 100 amino acids. In other embodiments, the blocking peptide has a maximum size of 75 amino acids or less, 50 amino acids or less, 40 amino acids or less, 30 amino acids or less, or 20 amino acids or less.
- polypeptide refers to an oligopeptide, peptide, or protein sequence, or to a fragment, portion, or subunit of any of these, and to naturally occurring or synthetic molecules.
- polypeptide also includes amino acids joined to each other by peptide bonds or modified peptide bonds, i.e., peptide isosteres, and may contain any type of modified amino acids,
- polypeptide also includes peptides and polypeptide fragments, motifs and the like, glycosylated polypeptides, all "mimetic” and “peptidomimctic” polypeptide forms, and retro-inversion peptides (also referred to as all-D-retro or mtro-enantio peptides).
- Substantially similar means that a given amino acid (or nucleic acid) sequence shares at least 85%, more preferably at least 90%, and even more preferably at least 95% identity with a reference sequence. Identity or homology with respect to such sequences is defined herein as the percentage of amino acid residues in the candidate sequence that are identical with the known peptides, after aligning the sequences and introducing gaps, if necessary, to achieve the maximum percent homology, and not considering any conservative substitutions as part of the sequence identity. N-terminal, C-terminal or internal extensions, deletions, or insertions into the peptide sequence, shall not be construed as affecting homology.
- Substantially similar peptides include those that differ by one or more amino acid alterations, where the alterations, e.g., substitutions, additions or deletions of amino acid residues, do not abolish the properties of the relevant peptides, such as their ability to associate with FAK or NANOG. Furthermore, only sequences describing or encoding proteins in which only conservative substitutions are made in the conserved regions are substantially similar overall. Preferable, substantially similar sequences also retain the distinctive activity of the poly peptide.
- Examples of conservative substitutions include the substitution of a non-polar (hydrophobic) residue such as isoleucine, leucine, or methionine for another.
- the present invention contemplates the substitution of one polar (hydrophilic) residue such as between arginine and lysine, between glutamine and asparagine, and between glycine and serine.
- the substitution of a basic residue such as lysine, arginine or histidine for another or the substitution of one acidic residue such as aspartic acid or glutamic acid for another is also contemplated.
- Examples of non-conservative substitutions include the substitution of a non-polar ;hydrophobic) residue such as isoleucine, valine, leucine, alanine, methionine for a polar
- hydrophilic residues such as cysteine, glutamine, glutamic acid, lysine, and/or a polar residue for a non-polar residue.
- substantially similar peptides also include the presence of additional amino acids or the deletion of one. or more amino acids which do not affect the requisite ability to associate with NT-3,
- substantially similar peptides can contain an N- or C-. terminal cysteine, by which, if desired, the peptide may be covalently attached to a carrier protein, e.g., albumin. Such attachment can decrease clearing of the peptide from the blood and also decrease the rate of proteolysis of the peptides.
- peptides containing D-amino acids in place of L-amino acids are also included in the term "conservative substitution.”
- D-isomers can. help minimize proteolytic activity and clearing of the peptide.
- a pro-neurotrophin-3 protein is administered to the subject.
- the pro form of neurotrophin-3 is a -30 kDa precursor form of NT-3 which is converted to the mature NT by enzymatic cleavage and removal of a -15 kDa N-terminal prodomain. See Tauris et al., Eur. J Neurosci, 33(4), 622-631 (2011).
- the present invention provides a method of treating a subject having periperhal muscle atrophy.
- Pyruvate compounds can be used to provide prophylactic and/or therapeutic treatment.
- Pyruvate compounds can, for example, be administered prophylactically to a subject in advance of the occurrence of peripheral neuropathy.
- Prophylactic (i.e., preventive) administration is effective to decrease the likelihood of the subsequent occurrence of peripheral neuropathy in the subject, or decrease the severity of peripheral neuropathy that subsequently occurs.
- Prophylactic treatment may be provided to a subject that is at elevated risk of developing peripheral neuropathy, such as a subject with a family history of peripheral neuropathy.
- the expression of mutations of myelin protein 22 represents 70-80% of all occurrences of Charcot-Marie-Tooth neuropathy, and thus their presence may be useful as criteria for selecting patients to receive treatment using the pyruvate compounds described herein.
- the compounds of the invention can be administered therapeutically to a subject that is already afflicted by peripheral neuropathy.
- administration of the compounds is effective to eliminate the peripheral neuropathy; in another embodiment, administration of the pyruvate compounds is effective to decrease the severity of the peripheral neuropathy or lengthen the lifespan of the subject so afflicted.
- the method of treatment consists of administering a
- a pyruvate compound in a pharmaceutically acceptable formulation to the subject over a substantial period of time.
- CMT Charcot-Marie-Tooth
- the autosomal dominant CMT neuropathy types are:
- CMT1 demyelinating
- CMT2 axonal non-demy linating
- DI-CMT dominant intermediate CMT
- Other neuropathies that are also equivalent to CMT are distal hereditary motor neuropathy 9dHMN) and distoal spinal muscular atrophy (DSMA) and Dejerine- Sottas syndrome (DSS). Descriptions and classifications of CMT neurophathies are provided in Bird, GeneReviews, Seattle Washington: University of Washington Seattle PIM 20301532, Updated 2018 Jun 28.
- CMT-associated genes there are over 70 known genetic variants known to CMT-associated genes. These genetic variants are provided in Table 1 below using the classification system of Magy et al. (Neurology 90:e870-6, 2018).
- the mode of inherence for each CMT-associated genetic variants are autosomal dominant (AD), autosomal recessive (AR) or X Linked (XL).
- the neuropathy for each CMT-associated genetic variant are axonal (Ax), demyelinating (De) and intermediate (In).
- the "other designations” provided in Table 1 are designations used in other classification systems which include dominate intermediate CMT (DI-CMT), distal spinal muscular dystrophy (DSMA), hereditary sensory and autonomic neuropathy (HSAN) and distal hereditary motor neuropathy (dHMN).
- DI-CMT dominate intermediate CMT
- DSMA distal spinal muscular dystrophy
- HSAN hereditary sensory and autonomic neuropathy
- dHMN distal hereditary motor neuropathy
- AD autosomal dominant
- ALS amyotrophic lateral sclerosis
- HSAN hereditary sensory and autonomic neuropathy
- dHMN distal hereditary motor neuropathy
- the vector or peptide used with some embodiments of the present invention can be incorporated into pharmaceutical compositions suitable for administration to a subject.
- the pharmaceutical composition comprises the vector of the invention and a pharmaceutically acceptable carrier.
- pharmaceutically acceptable carrier includes any and all solvents, dispersion media, coatings, antibacterial and antifungal agents, isotonic and absorption delaying agents, and the like that are physiologically compatible.
- Examples of pharmaceutically acceptable carriers include one or more of water, saline, phosphate buffered saline, dextrose, glycerol, ethanol and the like, as well as combinations thereof. In many cases, it can be preferable to include isotonic agents, for example, sugars, polyalcohols such as mannitol, sorbitol, or sodium chloride in the composition. Pharmaceutically acceptable carriers can further comprise minor amounts of auxiliary substances such as wetting or emulsifying agents, preservatives or buffers, which enhance the shelf life or effectiveness of the vector or pharmaceutical composition.
- the vectors or peptides can be administered acutely (i.e., during the onset or shortly after_events leading to muscular atrophy), or can be administered prophylactically (e.g., before scheduled surgery, or before the appearance of signs or symptoms), or administered during the course of muscular atrophy to reduce or ameliorate the progression of symptoms that would otherwise occur.
- the timing and interval of administration is varied according to the subject's symptoms, and can be administered at an interval of several hours to several days, over a time course of hours, days, weeks or longer, as would be determined by one skilled in the art.
- compositions containing the vectors or peptides are generally administered intravenously.
- the compositions may be combined with other ingredients, such as carriers and/or adjuvants.
- Peptides may also be covalently attached to a protein carrier, such as albumin, so as to minimize clearing of the peptides.
- a protein carrier such as albumin
- the pharmaceutical forms suitable for injection include sterile aqueous solutions or dispersions and sterile powders for the extemporaneous preparation of sterile injectable solutions or dispersions. In all cases the ultimate solution form must be sterile and fluid.
- Typical carriers include a solvent or dispersion medium containing, for example, water buffered aqueous solutions (i.e., biocompatible buffers), ethanol, polyols such as glycerol, propylene glycol, polyethylene glycol, suitable mixtures thereof, surfactants or vegetable oils. Sterilization can be accomplished by any art-recognized technique, including but not limited to, filtration or addition of antibacterial or antifungal agents, for example, paraben, chlorobutano, phenol, sorbic acid or thimerosal. Further, isotonic agents such as sugars or sodium chloride may be incorporated in the subject compositions.
- water buffered aqueous solutions i.e., biocompatible buffers
- polyols such as glycerol, propylene glycol, polyethylene glycol, suitable mixtures thereof, surfactants or vegetable oils.
- Sterilization can be accomplished by any art-recognized technique, including but not limited to, filtration or addition of
- the pharmaceutical compositions thereof containing an effective dose of the peptide can also contain an inert diluent, as assimilable edible carrier and the like, be in hard or soft shell gelatin capsules, be compressed into tablets, or may be in an elixir, suspension, syrup or the like.
- an inert diluent as assimilable edible carrier and the like
- the subject peptides are thus compounded for convenient and effective administration in pharmaceutically effective amounts with a suitable pharmaceutically acceptable carrier in a therapeutically effective amount.
- an effective amount or “therapeutically effective amount,” as used herein,_refers to a sufficient amount of agent to stimulate muscle growth or decrease or prevent muscle_atrophy.
- the exact amount required will vary from subject to subject, depending on the species,_age, and general condition of the subject, the particular therapeutic agent, its mode and/or route_of administration, and the like. It will be understood, however, that the total daily usage of the_compounds and compositions of the present invention can be decided by an attending physician_within the scope of sound medical judgment.
- the specific therapeutically effective dose level for_any particular subject or organism will depend upon a variety of factors including the disorder being treated and the severity of the disorder; the activity of the specific compound employed;_the specific composition employed; the age, body weight, general health, sex and diet of the_subject; the time of administration, route of administration, and rate of excretion of the specific_composition employed; the duration of the treatment; drugs used in combination or coincidental_with the specific composition employed; and like factors well known in the medical arts.
- the vectors or peptides can be administered in a manner compatible with the dosage formulation and in such amount as well be therapeutically effective.
- Systemic dosages depend on the age, weight and conditions of the patient and on the administration route.
- a suitable dose of peptide for.the administration to adult humans ranges from about 0.001 to about 20.0 mg per kilogram of body weight.
- the peptides should preferably be administered in an amount of at least about 50 mg per dose, more preferably in an amount up to about 500 mg to about 1 gram per dose. Since the peptide compositions of this invention will eventually be cleared from the bloodstream, re-administration of the compositions is indicated and preferred.
- AAV1.NT-3 gene therapy increases muscle fiber diameter through activation of mTOR pathway and metabolic remodeling in a CMT mouse model
- NT-3 has well-recognized effects on peripheral nerve and Schwann cells, promoting axonal regeneration and associated myelination.
- the effects of AAV.NT-3 gene therapy on the oxidative state of the neurogenic muscle from the Trembled (TrJ) mice at 16 weeks post- gene injection were assessed and found that muscle fiber size increase was associated with a change in the oxidative state of muscle fibers towards normalization of the fiber type ratio seen in the wild type.
- NT-3-induced fiber size increase was most prominent for the fast twitch glycolytic fiber population.
- NT-3 increases muscle fiber diameter in the neurogenic muscle through direct activation of mTOR pathway and that the fiber size increase is more prominent for fast twitch fibers.
- TrJ mice (B6.D2-Pmp22Tr-J/J) and C57BL/6 wild type were obtained from Jackson Laboratory (Bar Harbor, ME).
- Groups of mice were euthanized and their muscles harvested at 16 weeks post gene injection and processed for cryostat sectioning.
- Succinic dehydrogenase (SDH) enzyme histochemistry was used to assess metabolic fiber type differentiation using standard protocol established inhouse. Muscle fiber type specific diameter measurements were obtained from 12 [tin thick-SDH stained cross sections.
- AAV.NT-3 vector production and potency Design of self-complementary AAV viral vectors with serotype 1 containing NT-3 under tMCK or CMV promoter was described previously which were produced in the Viral Vector Core at National Children's Hospital, Columbus. Sahenk et al., Mol Ther, 22(3):511-521 (2014). Aliquoted viruses were kept in— 80°C until use. Blood samples were collected from treated and non-treated mice by eye bleeding under anesthesia at 6 and 16 weeks post injection and serum was assayed for NT-3 levels using a capture ELISA.
- C2C12 myoblast culture and myotube formation C2C12 myoblasts were cultured in growth medium (GM) consisting DMEM Medium (Gibco-Invitrogen, #10569010, Carlsbad, CA) supplemented with 10% FBS (Fisher Scientific, #26-140-079 Carlsbad, CA), and 1%
- Penicillin/streptomycin solution (Gibco-Invitrogen, #15640055 Carlsbad, CA) at 37 °C and 5% C02 in a humidified chamber.
- Myotube formation was induced on confluent cultured cells by switching the GM to differentiation medium [DMEM (Gibco-Invitrogen, #11965092, Carlsbad, CA) supplemented with 5% Horse serum (Gibco-Invitrogen, #26050088, Carlsbad, CA) and 1% Penicillin/streptomycin solution (Invitrogen, #15640055 Carlsbad, CA)]. All subsequent assays with myotubes including QPCR, Western Blot and ELISA were started 3 days after induction of myotube formation.
- myoblast and myotubes were collected in small 2 ml tubes after 30 minutes of incubation with NT-3 (100 ng/ml) and lysed in the same way as mentioned above. The lysates were centrifuged at 13,000 rpm for 10 minutes at 4° C and the supernatants were carefully collected. Protein concentration was measured by using BCA Protein Assay Kit (Thermo Fisher, #23252, Waltham, MA, USA). Protein samples (10-40 itg) were run in 4-12% Bolt® Bis-Tris Plus precast 10 or 15-well polyacrylamide gels (Thermo Fisher, #NW04120BOX) and transferred to PDVF membranes (GE Healthcare, #10600021, Pittsburgh, USA).
- the membranes were incubated with secondary antibodies [HRP conjugated anti-rabbit (#HAF008), HRP conjugated anti mouse (HAF007)] from R&D Systems, Minneapolis, MN, USA] in 5% dry milk in TBS-T buffer for 1 hour.
- the membranes were washed again with TBS-T in the same way as above and then incubated with ECL Prime western detection reagent (Amersham, #RPN2232 NJ, USA) for 1-3 minutes followed by exposing to X-ray films (Denville, #E3018, MA, USA) using multiple exposure times.
- Protein bands on the film were pictured using a camera (Sony A600, Japan) and the band intensities were quantified using (Quantity-One software, BioRad, v.4.6.9). The relative content of analyzed proteins in each sample was determined by normalizing band intensities to the content of GAPDH in the same sample. The membranes were stained with 0.1% Coomassie Brilliant Blue R stain (Thermo Fisher, USA), rinsed and photographed to confirm equal protein loading in each lane.
- NT-3 treatment in TrJ mice showed a differential effect on muscle fiber size increase (Table 2).
- NT-3 was expressed under the control of tMCK promoter a significant diameter increase was observed, only in the FTG fibers.
- the second treatment cohort where high NT-3 expression was obtained with the CMV promoter, there was significant diameter increase in all fiber types.
- this dose dependent NT-3 effect was only seen in the neurogenic TrJ muscle; no significant in diameter change was seen in any of the fiber types in the WT muscle with NT-3 gene therapy at the same time point, 16 weeks post gene injection.
- Table 2 shows that the fiber size increase in the neurogenic TrJ muscle following NT- 3 gene therapy is more prominent for fast twitch fibers.
- AAV-NT-3 improved mTQR signaling and metabolic markers in TrJ Muscle
- mTORCl regulates synthesis of nucleus-encoded mitochondrial proteins, controls mitochondrial activity and biogenesis, therefore coordinates energy
- NT-3 activates Akt/mTQRCl pathway through TrkC receptors in C2C12 myotubes
- NT-3 Treatment of myotubes with 100 ng of recombinant NT-3 for 30 minutes resulted in significantly higher phosphorylation of Akt, 4EBP1 and S6P compared to the control group ( Figure 3A).
- NT-3 was found to be significantly enhanced the expression the mitochondrial biogenesis marker PGC la and the marker of glycolysis, PK1 in myotubes upon 48 hours incubation ( Figure 3B).
- NT-3 exerts its biological effect through its preferred receptor TrkC or binding to low affinity neurotrophin receptor p75NTR.
- Schecterson LC Bothwell M, Neuron, 9(3):449-463 (1992).
- p75NTR is expressed in C2C12 myoblasts and downregulated during myogenic differentiation. Seidl et al., Journal of cellular physiology, 176(1): 10-21 (1998).
- NGF neurotrophic factor
- NT-3 can have direct effect on neurogenic muscle metabolism resulting in fiber size increase and fiber type remodeling toward normalization via activation of mTORCl.
- the fiber size increase was most prominent for type II fibers, particularly for the FTO subtype.
- NT-3 can induce Akt/mTOR pathway activation in myotubes but not in myoblasts directly, as an important contributor to its in vivo effect in neurogenic muscle.
- NT-3 gene therapy in WT muscle at the same dose did not affect these properties, although the NT-3 effect on the denervated WT muscle using the gene therapy paradigm was not studied.
- AAV.NT-3 treatment in the TrJ muscle increased both the size of the FTG fibers and the expression of glycolytic enzymes PK- 1 and HK- 1.
- in vitro studies revealed that NT-3 increased glucose uptake and lactate formation in myotubes along with upregulation of PK-1.
- NT-3 might take part in controlling whole body metabolism by regulating fast/glycolytic fibers, further studies are needed to characterize its role in detail.
- AAV.NT-3 treatment was capable of reversing the defective expression levels of PGCla seen in the TrJ neurogenic muscle along with enhanced levels of activated 4E-BP1.
- mTOR regulates mitochondrial biogenesis and metabolism through 4E-BPl/PGCla. Tsai et al., J Clin Invest, 125(8):2952-2964 (2015). NT-3 might also be playing role promoting oxidative phosphorylation through activation of 4EBP1 and PGC la in the muscle.
- NT-3 is found in high levels first in the central nervous system (CNS) during fetal development and is reduced in the adult brain, suggesting that it has a central role during early neuronal development [28, 29]. NT-3 is also important in the peripheral nerves, and has positive effects at multiple stages of neuromuscular development. In Xenopus nerve-muscle co-cultures muscle-derived NT-3 significantly enhances maturation of synaptic transmission at the neuromuscular junction [30-33]. Moreover, NT-3 increases the survival of a crucial element of the neuromuscular system, the SC [34]. NT-3, expressed in SCs, promotes nerve regeneration, and is an important component of the autocrine survival loop, ensuring SC survival and differentiation in adult nerves[35-39].
- CNS central nervous system
- NT-3 neurofilament cytoskeleton
- Akt kinase has a role in regulating myelination in the CNS.
- Transgenic overexpression of a constitutively active Akt kinase is sufficient to enhance myelin membrane growth in the CNS via mTOR signaling [41, 42] and IGF- 1- stimulated protein synthesis in oligodendrocyle progenitors requires PDKJAkt and MER/ERK pathways [43].
- the capacity of NT-3 targeting the translational machinery to stimulate myelin protein synthesis was first shown in oligodendrocyte primary cultures [44] . NT-3 was found to upregulate 4EBP1 phosphorylation in the oligodendrocytes through
- PI3K/mTOR pathway Using gene inactivation approach, ablating mTOR function specifically in SCs influenced their ability to myelinate normally [45]. In fact, in mutants the myelin sheath was found thin, internodal length was short and the radial growth of axons was impaired. Along with, the mTOR downstream targets, S6 and 4E-BP1 were less phosphorylated [45].
- NT-3 effect on the muscle fiber diameter increase is through the same mechanism, a direct effect via activation of mTORCl. It is important to note that NT-3 gene therapy in WT muscle at the same dose used in the TrJ did not induce a significant change in fiber type size or type distribution. These observations in WT muscle suggest NT-3 effect is not directed to well-differentiated or normal functioning cells, but rather is functional upon remodeled-cell metabolism that may result from a pathological process. One supporting evidence is that NT-3 does not alter functional recovery following crush injury in WT animals, resulting in only slightly more axons than control or NGF-treated animals [46]. Our toxicology studies assessing scAAVl.tMCK.NT-3 are in agreement with these observations showing no treatment-related toxicity or histopathological abnormalities of organ tissues in
- p75NTR is expressed transiently on myoblasts that will form myotubes/muscle fibers or differentiate into satellite cells [23].
- the temporal expression pattern of the receptor indicates that p75NTR mediates survival of myoblasts prior to
- NT-3 enhanced the expression of myogenin in the myotubes, and as expected, this was associated with strikingly higher expression of p75NTR in myoblasts, which significantly down regulated in the myotubes.
- p75NTR and TrkC expression in TrJ and WT muscle samples were examined and found significantly high expression levels of both in the neurogenic TrJ muscle compared to WT and the levels came down in response to NT-3 ( Figure 5). Although interesting, this observation does not allow any conclusion as to which cell types express these receptors, or whether they are expressed in all or only a subtype of muscle fibers, in satellite cells or SCs.
- NT-3 and other neurotrophins and their receptors in human muscle disease are limited.
- recent studies so far combining histological investigations of muscle biopsies with molecular and cellular analyses of primary muscle precursor cells have shown that p75NTR is expressed by most satellite cells in vivo and is a marker for regenerating fibers in inflamed and dystrophic muscle [47, 48].
- Our findings in neurogenic muscle are of particular interest and more comprehensive studies on mechanisms in different disease processes are required.
- mTOR is a central regulator of cell growth by integrating signals from nutrients, growth factors, energy status, and environmental stress.
- mTOR associates with raptor to form mTORCl and muscle- specific inactivation of raptor was shown to lead to muscle atrophy, impaired oxidative capacity, and increased glycogen stores, resulting in dystrophic features that were most prominent in oxidative muscles [49].
- Loss of mTOR activity on the other hand exacerbated the myopathic features in both slow oxidative and fast glycolytic muscles and display metabolic changes similar to those observed in muscles lacking raptor, including impaired oxidative metabolism, altered mitochondrial regulation, and glycogen accumulation [26].
- composition administered is a non-replicating recombinant adeno-associated virus termed scAAVl.tMCK.NTF3, which is shown in Figure 3.
- the vector contains the human NT-3 gene under the control of a tMCK muscle- specific promoter. In vivo biopotency will be tested following the intramuscular injection of the vector (lxlO 11 vg) into gastrocnemius muscles of C57B 16 mice followed by quantification of circulating NT-3 in the serum by ELISA at 4 to 6 weeks after gene injection.
- ssAAVl.CMV.NTF3 delivered to gastrocnemius muscle produced prolonged and therapeutic NT-3 blood levels sufficient to provide functional, electrophysiological and histopathological improvement in TrJ nerves. It was then investigated if it was possible to produce the required vector dose and achieve same level of expression by packaging the expression cassette by scAAVl.
- a dose- response study was performed on C57BL/6 mice comparing serum NT-3 ELISA data following intramuscular injection of scAAVl.tMCK.NTF3 and scAAVl.CMV.NTF3 at 3 doses (3 x 10 9 vg, 1 x 10 10 vg and 3 x 10 10 vg).
- sc.rAAVl.CMV.NTF3 vector at lxlO 11 vg produced significantly higher NT-3 levels than the single- stranded vector at the same dose consistent with greater potency using self-complementary vectors.
- both CMV and tMCK vectors produced comparable NT-3 serum levels to those obtained from mice that received ss.AAVl.CMV.NTF3 at lxlO 11 vg dose, which produced a biological response..
- the NT-3 levels (mean + SEM) from TrJ mice at 24 weeks post injection. There is significant difference in NT-3 levels among all 7 groups, p value ⁇ 0.0001.
- Muscle diameter increases at 40 weeks posttreatment The effects of NT-3 gene therapy was assessed in TrJ mice upon muscle fiber size at 40 weeks postinjection in a subset of animals injected with ssAAVl.CMV.NTF3 (1 x 10 11 vg) compared to PBS. Neurogenic changes characterized by atrophic angular fibers and group atrophy were evident in the muscles from untreated mice while evidence for reinnervation as fiber type groupings and an overall fiber size increase were recognizable as treatment effect. Muscle fiber size histograms generated from contralateral anterior and posterior compartment muscles of the left lower limb (tibialis anterior and gastrocnemius) showed an increase in fiber diameter.
- NT-3 stimulates Akt/mTOR pathway in SCs cells giving rise to improved myelination and radial growth of axons in the nerve and NT-3 also has a direct stimulatory effect on myotubes through Trk-C receptors indicating its role in fiber diameter increase in muscles of TrJ mice.
- Figure 3A shows NT-3 increased the phosphorylation of Akt (P-Akt) and mTOR targets, 4EBP-1 (P-4EBP1) and PS6K (P-S6K) in SC and myotube cultures.
- scAAV permits lower dosing that adds up to enhanced safety and dosing levels that will meet production standards.
- the use of tMCK promoter is a valued objective again offering greater safety by avoiding off target effects.
- the efficacy of scAAVl.NTF3 under control of the CMV promoter was compared to the muscle specific tMCK promoter both given at three doses, within a half-log range (3 x 10 9 vg, 1 x 10 10 vg and 3 x 10 10 vg).
- the efficacy AAV1.NTF3 gene transfer in TrJ mice peripheral nerves were assessed by electrophysiological (Table 3) and morphological studies 24 weeks post gene transfer. The evidence of transgene expression was assessed by measuring serum NT-3 levels using ELISA.
- AAVl.NTF3.tMCK (high dose, HD) on CMAP and it was preferred to use the muscle specific tMCK promoter. This is further supported by the NT-3 levels in ELISA Assay where a significant difference in NT-3 levels was observed for highest and intermediate doses of vectors for both promoters and control.
- a tMCK promoter/enhancer sequence was used to drive muscle-specific gene expression and is composed of the muscle creatine kinase promoter with an added enhancer element (enh358MCK, 584-bp) fused to it.
- a triple tandem of the MCK enhancer (206-bp) was ligated to the 87-bp basal promoter in the tMCK promoter/enhancer.
- the scAAVl.tMCK.NTF3 drug product was produced by 3 plasmid DNA
- transfection of human HEK293 Master Cell Bank cells with: (i) the pAAV.tMCK.NTF3- vector plasmid (see Figure 7), (ii) an AAV1 helper plasmid termed R88/C1 containing the AAV rep2 and Capl wild-type genes and (iii) the helper adenovirus plasmid
- a schematic representation of the plasmid with molecular features and open reading frames is shown in 7.
- the AAV vector genome derived from pAAV.tMCK.NTF3 plasmid is a self-complementary DNA genome containing the human NTF3 cDNA expression cassette flanked by AAV2 inverted terminal repeat sequences (ITR). It is this sequence that is encapsulated into AAV1 virions.
- Plasmid pAAV.tMCK.NTF3 was constructed by inserting the tMCK expression cassette driving a NTF3 gene sequence into the AAV cloning vector psub201.
- the human NTF3 gene is expressed from the mouse triple tandem MCK promoter which is a modification of the previously described CK6 promoter and contains a triple E box sequence.
- An SV40 polyadenylation signal is used for efficient transcription termination.
- the cassette also contains a chimeric intron for increased gene expression and is composed of the 5' donor site from the first intron of the human ⁇ -globin gene and the branchpoint and 3' splice acceptor site from the intron that is between the leader and the body of an immunoglobulin gene heavy chain variable region.
- the NTF3 expression cassette has a consensus Kozak immediately in front of the ATG start and 200 bp SV40 polyA signal for efficient mRNA termination.
- the NTF3 cDNA is included in its entirety (NCBI Reference Sequence: NM_001102654).
- the only viral sequences included in this vector are the inverted terminal repeats of AAV2, which are required for both viral DNA replication and packaging.
- the AAV ITRs are sequences that are nearly identical on both ends, but in opposite orientation.
- the "left" (mutated) ITR has the terminal resolution site deleted to allow hairpin formation of the genome.
- the identity of all DNA plasmid elements are confirmed by DNA plasmid sequencing on the plasmid source stock.
- This clinical trial is an open-label, one-time injection ascending dose study in which scAAVl.tMCK.NTF3 is administered by intramuscular injection into gastrocnemius and tibialis anterior muscles in both legs in CMT1A subjects with PMP22 gene duplication.
- scAAVl.tMCK.NTF3 is administered by intramuscular injection into gastrocnemius and tibialis anterior muscles in both legs in CMT1A subjects with PMP22 gene duplication.
- Nine adult CMT1A patients, 18 years of age and older are enrolled into one of two cohorts in this trial. The first three subjects are enrolled at a low-minimally effective dose (2.0 X 10 12 vg/kg) distributed bilaterally between both limbs in Cohort 1.
- An additional six subjects are enrolled with a 3-fold dose escalation (6.0 X 10 12 vg/kg) in Cohort 2.
- Post-gene transfer monitoring includes follow up visits on days 7, 14, 30, 60, 90, 120, and 3 month intervals for the remainder of the trial extending for 2 years.
- Safety is a primary endpoint for this clinical gene transfer trial. Stopping criteria are based on development of unacceptable toxicity defined as the occurrence of any Grade II ocular or systemic toxicity not resolving after two weeks or any Grade III or higher toxicities.
- the secondary endpoint is efficacy defined as halting of the decline in abilities measured by the CMT Pediatric Scale (CMTPedS) at 2 years post gene transfer.
- the CMTPedS is an 11-item scale comprised of the Functional Dexterity Test, Nine-Hole Peg Test (9HPT), hand grip, foot plantarflexion, and foot dorsiflexion strength using handheld myometry, pinprick and vibration sensation, the Bruininks Oseretsky Test- Balance assessment, gait assessment, long jump, and six-minute walk test (6MWT).
- HPT Nine-Hole Peg Test
- 6MWT six-minute walk test
- Exploratory outcome measures will include 100-meter timed test (100M), peroneal and ulnar CMAP amplitude and sensory and motor conduction velocities, a revised sensory testing to increase sensitivity for pinprick, touch-test and vibration assessments, visual analogue scales for pain and fatigue, Short Form Health Survey (SF-36) as Quality of Life measure, and circulating NT-3 levels.
- 100M 100-meter timed test
- peroneal and ulnar CMAP amplitude and sensory and motor conduction velocities a revised sensory testing to increase sensitivity for pinprick, touch-test and vibration assessments
- visual analogue scales for pain and fatigue visual analogue scales for pain and fatigue
- SF-36 Short Form Health Survey
- NT-3 levels circulating NT-3 levels.
- immunosuppressive therapy or immunosuppressive therapy within 6 months of starting the trial e.g., corticosteroids, cyclosporine, tacrolimus, methotrexate, cyclophosphamide, intravenous immunoglobulin
- Table 5 provides an outline of the dosing plan based on a patient bodyweight of 70 Kg as an example. Dosing volumes are based on target product concentration of approximately 1.5xl0 13 vg/ml.
- each patient will receive a dose of oral prednisone 1 mg/kg/day with a max of 60 mg/day, followed by a second dose the day of gene transfer.
- the subject will receive prednisone both 24 and 48 hours post-gene transfer for a total of 4 doses.
- AAV1 carrying a human NTF3 gene under the control of the tMCK promoter (scAAVl .tMCK.NTF3) is administered in a one-time bilateral intramuscular injection to the medial and lateral heads of the gastrocnemius and tibialis anterior (TA) muscles.
- Vector is delivered without diluent for a total of approximately lOmL to 28 mL per patient (5 to 14 mL per limb, which is divided into 3 muscles).
- Vector is delivered to the procedure room in pre-labeled syringes sealed in double leak-proof bags, carried in a designated labeled cooler.
- the injections are at least 0.25 cm below the fascia with injections following a longitudinal axis of the muscle guided by ultrasound.
- Safety is a primary endpoint for this clinical gene transfer trial. This is evaluated based on development of unacceptable toxicity defined as the occurrence of any one Grade III or higher, unanticipated, treatment-related toxicities.
- the secondary endpoint of the clinical gene transfer trial is efficacy defined as halting of the decline in abilities measured by the CMT Pediatric Scale (CMTPedS) at 2 years post gene transfer.
- CMTPedS CMT Pediatric Scale
- the extremity for testing is immobilized for testing, which significantly improves reliability of foot isometric contraction measures (29).
- Upper limb function is measured with the 9-hole peg test (9HPT).
- Lower limb function is measured with the timed 10 meter run/walk (T10MW) test.
- Exploratory outcomes include 100-meter timed test (100M), peroneal and ulnar CMAP amplitude and sensory and motor conduction velocities, a revised sensory testing to increase sensitivity for pinprick, touch-test and vibration assessments, visual analogue scales for pain and fatigue, Short Form Health Survey (SF-36) as Quality of Life measure, and circulating NT-3 levels.
- 100M 100-meter timed test
- peroneal and ulnar CMAP amplitude and sensory and motor conduction velocities a revised sensory testing to increase sensitivity for pinprick, touch-test and vibration assessments
- visual analogue scales for pain and fatigue
- SF-36 Short Form Health Survey
- Electrophysiological testing includes measurement of ulnar sensory nerve amplitude and compound muscle action potential (CMAP) amplitude of the ulnar nerve (recorded from the abductor digiti minimi muscle) and the peroneal nerve (recorded from the tibialis anterior muscle) and sensory and motor conduction velocities.
- CMAP compound muscle action potential
- Peroneal CMAP amplitude from tibialis anterior has been shown to be a useful outcome measure for clinical trials in patients with CMT1A(30); and for upper limb motor symptoms ulnar CMAP amplitude has proven to be the most informative parameter(31).
- Foot and hand temperatures will be kept at 32-34° C during these testing procedures.
- Visual analogue scales will be used for measure of pain and fatigue (32).
- the Short Form Health Survey (SF-36) are used as a quality life document to monitor and compare disease burden pre and post-treatment.
- Safety is a primary endpoint for this clinical gene transfer trial. This is will be evaluated based on development of unacceptable toxicity defined as the occurrence of any one Grade III or higher, unanticipated, treatment-related toxicities. Safety will be measured at each study with a collection of height and weight, vital signs, physical exam and review of systems, and a battery of blood lab work. Lab work will include CBC, platelets, blood urea nitrogen (BUN), GGT, bilirubin, alkaline phosphatase, alpha-fetoprotein, creatinine, amylase, serum protein electrophoresis, electrolytes, B 12, glucose, PT/INR and PTT, CK, urinalysis.
- BUN blood urea nitrogen
- GGT blood urea nitrogen
- bilirubin alkaline phosphatase
- alpha-fetoprotein alpha-fetoprotein
- creatinine alpha-fetoprotein
- creatinine alpha-fetoprotein
- creatinine alpha-
- Immunology will consist of neutralizing antibodies to AAV1 and ELISA for detection of antibodies to NT-3, ELISpots to detect T cell responses to AAV1 and NT-3. All adverse events will be recorded and assessed for relatedness to gene transfer.
- the main secondary outcome measure is defined as lack of decline in disease severity on the CMT Disease Pediatric Scale score (CMTPedS).
- CMTPedS CMT Disease Pediatric Scale score
- the computerized scoring system of the CMTPedS uses z scores from a normative sample to determine the individuals score based on the number of standard deviations the patients performance differs from the healthy population. Scoring the CMTPedS is at a fixed age of 20 years for all patients throughout the study, which is necessary for two reasons. The first reason is that the original CMTPedS scale relies on normative values for individual scale items in the computation of the final score, but normative values do not exist for individuals over the age of 2030.
- the second reason is that, although a score comparing the child to healthy peers is essential for children who are still developing, it has the limitation of imposing a functional decline when the child has another birthday. Even if the child's raw score on the test does not change, the scoring criteria is designed to become more stringent as they age, reflecting the expected motor skill improvement typically seen in healthy kids. However, in a clinical trial of a degenerative disease, a halting of the actual progression would constitute a successful trial. Keeping the age of the reference control data consistent throughout the study allows for use of the validated scoring system built into the CMTPedS. It also allows for the observation of actual change on the assessment so that a halt in progression is detected.
- a successful secondary outcome measure is defined as a halt in the rate of deterioration in a standardized composite score of hand grip and ankle dorsiflexion strength, time to complete the 9-hole peg test and time to walk/run 10 meters.
- scAAVl.tMCK.NTF3 in a total volume of 50 ⁇ .
- This strain of carrier mice is available from Jackson Laboratories (stock #000664) or Charles River (stock#027). Tr J mice are available from Jackson Laboratories (stock #002504).
- Trembler mice were 8-10 weeks old at time of injection. Due to availability of animals and known breeding issues of the animal strain, a subset of animals was treated at 12 weeks of age.
- a total of 88 (44 Male / 44 Female) animals were included in the study. 44 animals (22 C57BL/6, 22 TrJ) were treated with saline control and 44 animals (22 C57BL/6, 22 TrJ) were treated with scAAVl.tMCK.NTF3 test article. Out of these numbers, half of the animals from each cohort were euthanized at 24 weeks post treatment and the remaining animals were euthanized at 48 weeks post treatment. Animals were uniquely identified by ear tags. Study Design
- the chamber consisted of a clear nonrestrictive Plexiglas cylinder resting on a platform inside a ventilated chamber.
- a high-frequency loudspeaker inside the chamber produced both a continuous background noise of 65 dB and the various acoustic stimuli.
- Vibrations of the Plexiglas cylinder caused by the whole-body startle response of the animal were transduced into analogue signals by a piezoelectric unit attached to the platform. The signals were then digitized and stored by the computer. Sixty-five readings were taken at 1ms intervals, starting at stimulus onset, and the average amplitude (V avg ) was used to determine the acoustic startle response. A 65 dB background noise level was presented for a 5 min acclimation period and continued throughout the test session. All pre-pulse inhibition (PPI) test sessions consisted of startle trials (pulse alone), prepulse trials (prepulse + pulse), and no-stimulus trials (no-stim).
- PPI pre-pulse inhibition
- the pulse alone trial consisted of a 40ms 120 dB pulse of broad-band noise.
- PPI was measured by prepulse + pulse trials that consisted of a 20 ms noise prepulse, 100 ms delay, and then a 40ms 120 dB startle pulse.
- the acoustic prepulse intensities were 69, 73, and 81 dB.
- the no-stimulus trial consisted of background noise only.
- the test session began and ended with five presentations of the pulse alone trial; in between, each trial type was presented 10 times in pseudorandom order. There was an average of 15 s (range 12-30 s) between trials.
- Clinical chemistries were analyzed for the following parameters: Alanine aminotransferase, Alkaline Phosphatase, Aspartate aminotransferase, Bilirubin (Total and Direct), Blood Urea nitrogen, Creatinine, Creatine Kinase, Glucose, Total Protein.
- Tr J animals were collected for histopathology analysis: gonad, brain, spleen, kidney, jejunum, colon, pancreas, heart, lung, stomach, liver, inguinal lymph nodes, spinal cord, gastrocnemius muscle (right and left), and gross lesions (if any). Tissues were fixed in 10% neutral buffered formalin, sectioned and stained with Hematoxylin and eosin. Histological analysis was performed by SNBL USA.
- the remainder of the sciatic nerve tissue and lumbar DRGs were cryo -protected in 30% sucrose, frozen in isopentane cooled in liquid nitrogen and cut inl2 ⁇ sections for immunohistochemistry for detection of CGRP positivity in DRG neurons and axons (spinal cord and brain from TrJ mice were placed in 10% neutral buffered formalin.
- the animals indicated were dosed once on day 0 with a 50 ⁇ volume via a single IM injection into the left gastrocnemius muscle.
- animals were anesthetized with isoflurane inhalation, for a minimum of 15 minutes.
- Doses were administered by direct injections into the left gastrocnemius. Care is taken to accurately deposit the entire vector dose into the muscle.
- animals were observed until ambulatory and returned to the cage. Observations of each animal are performed daily for the whole duration of the study. Body mass is measured every 2 weeks. Mortality checks were performed twice daily.
- mice were overdosed with Ketamine/Xylazine mixture (200mg/kg/20mg/kg). Blood was collected via heart puncture. Tissues were then collected and sent for analysis.
- Body weights, mouse hematology and clinical chemistries are plotted for each cohort per time point.
- ELISA assays for anti-AAVl circulating antibodies, anti-NT-3 circulating antibodies, and circulating NT-3 levels were performed for all end points.
- Hypersensitivity functional testing using the rodent hot plate and acoustic startle apparatus were performed every 8 weeks for all animals.
- Behavioral testing was performed every two weeks for rotarod and wire hanging tests for all animals.
- Formal histopathology on organs was performed for all animals. In- house histopathology on lumbar spinal cord and DRGs were performed on 6 mice per cohort (3M, 3F), with the exception of the Tr J cohort which included 5 animals (3M, 2F).
- Histopathology assessment included immunocytochemical distribution of CGRP positivity (in lumbar DRG neurons and spinal cord) and plastic embedding of sciatic nerves and DRG neurons for analysis of pathological changes.
- mice were measured every two weeks throughout the course of the study. All treatment groups kept gaining weight in a steady manner throughout the study.
- ELISA assays for anti-AAVl antibodies, anti-NT-3 antibodies and circulating NT-3 were performed with serum samples collected during the 24 and 48 week necropsies.
- Enzyme-Linked Immunosorbant Assay see Table 7 below. Animals treated with scAAVl.tMCK.NTF3 had elevated circulating antibodies to AAVl capsid. Antibody titers were similar in both males and females at both time points. Positive titer (>1:50) was not detected in saline control treated animals.
- Circulating NT-3 levels were determined in serum samples of Tr J mice collected at 24 and 48 weeks post vector administration via standard binding ELISA assay. Intramuscular injection of scAAVl .tMCK.NTF3 vector resulted in robust expression and secretion of NT-3 Tr J mice at 24 and 48 weeks post vector administration.
- Table 9 shows the mean and standard deviations of serum NT-3 levels at 24 and 48 post- injection in Tr J from saline and vector injected groups. Gender had no effect on the circulating NT-3 levels.
- hypersensitivity testing revealed no treatment or gender specific changes in C57BL/6 or Tr J animals. Auditory sensitivity measurements revealed no test article related changes in C57BL/6 animals, but did demonstrate a deficit in control article treated Tr J animals with an improvement toward normalization in test article treated Tr J animals. This improvement was seen primarily in male Tr J animals. Rotarod assessment of motor control in C57BL/6 animals revealed no differences related to treatment with the test article. Test article treated TrJ animals demonstrated a significant improvement as compared to control Tr J animals beginning at 16 weeks post treatment. Similarly, wire hanging assessment revealed no differences in the C57BL/6 cohort related to the test article. Tr J animals treated with the test article demonstrated a significant improvement in wire hanging time beginning at 28 weeks post treatment which persisted to endpoint.
- Myelin-associated glycoprotein is a myelin signal that modulates the caliber of myelinated axons. J Neurosci 1998;18: 1953-1962.
Abstract
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IL273976A (en) | 2020-05-31 |
US20200339960A1 (en) | 2020-10-29 |
KR20200083495A (en) | 2020-07-08 |
CA3079416A1 (en) | 2019-04-25 |
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