Bartus R.T.,RTBioconsultants Inc. |
Bartus R.T.,Ceregene |
Kordower J.H.,Rush Presbyterian Medical Center |
Johnson E.M.,University of Washington |
And 8 more authors.
Neurobiology of Disease | Year: 2015
Substantial interest persists for developing neurotrophic factors to treat neurodegenerative diseases. At the same time, significant progress has been made in implementing gene therapy as a means to provide long-term expression of bioactive neurotrophic factors to targeted sites in the brain. Nonetheless, to date, no double-blind clinical trial has achieved positive results on its primary endpoint despite robust benefits achieved in animal models. A major issue with advancing the field is the paucity of information regarding the expression and effects of neurotrophic factors in human neurodegenerative brain, relative to the well-characterized responses in animal models. To help fill this information void, we examined post-mortem brain tissue from four patients with nigrostriatal degeneration who had participated in clinical trials testing gene delivery of neurturin to the putamen of patients. Each had died of unrelated causes ranging from 1.5-to-3-months (2 Parkinson's disease patients), to 4+-years (1 Parkinson's disease and 1 multiple-system atrophy-parkinsonian type patient) following gene therapy.Quantitative and immunohistochemical evaluation of neurturin, alpha-synuclein, tyrosine hydroxylase (TH) and an oligodendroglia marker (Olig 2) were performed in each brain. Comparable volumes-of-expression of neurturin were seen in the putamen in all cases (~. 15-22%; mean. =. 18.5%). TH-signal in the putamen was extremely sparse in the shorter-term cases. A 6-fold increase was seen in longer-term cases, but was far less than achieved in animal models of nigrostriatal degeneration with similar or even far less NRTN exposure. Less than 1% of substantia nigra (SN) neurons stained for neurturin in the shorter-term cases. A 15-fold increase was seen in the longer-term cases, but neurturin was still only detected in ~. 5% of nigral cells.These data provide unique insight into the functional status of advanced, chronic nigrostriatal degeneration in human brain and the response of these neurons to neurotrophic factor stimulation. They demonstrate mild but persistent expression of gene-mediated neurturin over 4-years, with an apparent, time-related amplification of its transport and biological effects, albeit quite weak, and provide unique information to help plan and design future trials. © 2015 Elsevier Inc.
Bartus R.T.,Ceregene |
Bartus R.T.,RTBioconsultants Inc. |
Weinberg M.S.,University of North Carolina at Chapel Hill |
Samulski R.J.,University of North Carolina at Chapel Hill
Molecular Therapy | Year: 2014
Over the past decade, nine gene therapy clinical trials for Parkinson's disease (PD) have been initiated and completed. Starting with considerable optimism at the initiation of each trial, none of the programs has yet borne sufficiently robust clinical efficacy or found a clear path toward regulatory approval. Despite the immediately disappointing nature of the efficacy outcomes in these trials, the clinical data garnered from the individual studies nonetheless represent tangible and significant progress for the gene therapy field. Collectively, the clinical trials demonstrate that we have overcome the major safety hurdles previously suppressing central nervous system (CNS) gene therapy, for none produced any evidence of untoward risk or harm after administration of various vector-delivery systems. More importantly, these studies also demonstrated controlled, highly persistent generation of biologically active proteins targeted to structures deep in the human brain. Therefore, a renewed, focused emphasis must be placed on advancing clinical efficacy by improving clinical trial design, patient selection and outcome measures, developing more predictive animal models to support clinical testing, carefully performing retrospective analyses, and most importantly moving forward - beyond our past limits. © The American Society of Gene & Cell Therapy.
News Article | November 30, 2016
SAN DIEGO, Nov. 30, 2016 (GLOBE NEWSWIRE) -- Otonomy, Inc. (NASDAQ:OTIC), a biopharmaceutical company focused on the development and commercialization of innovative therapeutics for diseases and disorders of the ear, today announced the appointment of Kathie M. Bishop, Ph.D., as chief scientific officer. Dr. Bishop is a neuroscientist with more than fifteen years of pharmaceutical development experience. At Ionis Pharmaceuticals, she led translational research and development of programs in the neurology franchise including SPINRAZAä (nusinersen), a treatment for patients with spinal muscular atrophy that is awaiting regulatory approval. "Kathie is a great fit to lead our development efforts given her neuroscience background and successful track record managing significant development programs from inception through to registration," said David A. Weber, Ph.D., president and CEO of Otonomy. "Furthermore, her extensive experience with local drug delivery in the nusinersen as well as other programs is highly relevant to our focus in developing locally administered therapeutics for otic disorders." Dr. Bishop succeeds Carl LeBel, Ph.D., who had previously announced his retirement. She joins Otonomy from Tioga Pharmaceuticals where she served as chief scientific officer since 2015. Previously, she served in product development management roles at Ionis Pharmaceuticals including vice president, clinical development. At Ionis, she led translational research and development of a portfolio of programs in the neurology franchise which included clinical-stage products for the treatment of spinal muscular atrophy, myotonic dystrophy, and amytrophic lateral sclerosis and preclinical programs targeting various disorders including retinal degeneration. Prior to Ionis, she served in research and development leadership roles at Ceregene, a company focused on the development of gene therapy products for the treatment of neurodegenerative disorders and retinal diseases. Before joining Ceregene, she worked as a post-doctoral fellow in the Molecular Neurobiology Lab at the Salk Institute in La Jolla. Dr. Bishop obtained her Ph.D. in Neuroscience from the University of Alberta, a B.A. in Psychology from Simon Fraser University and a B.Sc. in Cell Biology and Genetics from the University of British Columbia. Otonomy is a biopharmaceutical company focused on the development and commercialization of innovative therapeutics for diseases and disorders of the ear. OTIPRIO® (ciprofloxacin otic suspension) is approved in the United States for use during tympanostomy tube placement surgery in pediatric patients, and commercial launch commenced in March 2016. OTO-104 is a steroid in development for the treatment of Ménière's disease and other severe balance and hearing disorders. Two Phase 3 trials in Ménière's disease patients are underway, with results expected during the second half of 2017. OTO-311 is an NMDA receptor antagonist for the treatment of tinnitus that is in a Phase 1 clinical safety trial. Otonomy’s proprietary formulation technology utilizes a thermosensitive gel and drug microparticles to enable single dose treatment by a physician. For additional information please visit www.otonomy.com. This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements generally relate to future events or future financial or operating performance of Otonomy. Forward-looking statements in this press release include, but are not limited to, the timing of results for the two OTO-104 Phase 3 clinical trials in Ménière's disease. Otonomy's expectations regarding these matters may not materialize, and actual results in future periods are subject to risks and uncertainties. Actual results may differ materially from those indicated by these forward-looking statements as a result of these risks and uncertainties, including but not limited to: Otonomy's limited operating history and its expectation that it will incur significant losses for the foreseeable future; Otonomy's ability to obtain additional financing; Otonomy's dependence on the commercial success of OTIPRIO and the regulatory success and advancement of additional product candidates, such as OTO-104 and OTO-311, and label expansion indications for OTIPRIO; the uncertainties inherent in the clinical drug development process, including, without limitation, Otonomy's ability to adequately demonstrate the safety and efficacy of its product candidates, the preclinical and clinical results for its product candidates, which may not support further development, and challenges related to patient enrollment in clinical trials; Otonomy's ability to obtain regulatory approval for its product candidates; side effects or adverse events associated with Otonomy's product candidates; competition in the biopharmaceutical industry; Otonomy's dependence on third parties to conduct preclinical studies and clinical trials; the timing and outcome of hospital pharmacy and therapeutics reviews and other facility reviews; the impact of coverage and reimbursement decisions by third-party payors on the pricing and market acceptance of OTIPRIO; Otonomy's dependence on third parties for the manufacture of OTIPRIO and product candidates; Otonomy's dependence on a small number of suppliers for raw materials; Otonomy's ability to protect its intellectual property related to OTIPRIO and its product candidates in the United States and throughout the world; expectations regarding potential market size, opportunity and growth; Otonomy's ability to manage operating expenses; implementation of Otonomy's business model and strategic plans for its business, products and technology; and other risks. Information regarding the foregoing and additional risks may be found in the section entitled "Risk Factors" in Otonomy's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission (the "SEC") on November 3, 2016, and Otonomy's future reports to be filed with the SEC. The forward-looking statements in this press release are based on information available to Otonomy as of the date hereof. Otonomy disclaims any obligation to update any forward-looking statements, except as required by law.
News Article | December 1, 2016
There are different kinds of growth factors present in the human body. Some of the major growth factors include insulin-like growth factors, platelet-derived growth factors, epidermal growth factors, and nerve growth factor. Moreover, some cytokines, such as small proteins secreted by one cell to regulate the function of another cell, also act as growth factors. Growth factors are mainly used in the treatment of chronic diseases, such as anemia, renal disorders, cancer, etc. For instance, erythropoietin, which stimulates the growth of Red Blood Cells (RBCs), is used to treat anemia. Granulocyte-Macrophage Colony-Stimulating Factor (GM-CSF) and Granulocyte Colony-Stimulating Factor (G-CSF) are involved in the stimulation of White Blood Cells (WBCs) in cancer patients. However, abnormal production of growth factors causes several diseases. For instance, vascular endothelial growth factor provokes endothelial cells to penetrate tumor in blood capillaries. The global growth factors market covers various blood growth factors and tissue growth factors. Blood growth factors include colony stimulating factors, erythropoietins, interferons, and interleukins. In terms of geography, North America dominates the global growth factors market. This is due to improved health care infrastructure and increasing prevalence of chronic diseases in the region. In addition, growing demand for recombinant growth factors has also propelled the growth of the market in North America. The U.S. represents the largest market for growth factors in North America, followed by Canada. In Europe, Germany, France, and the U.K. account for the major share of the growth factors market. The growth factors market in Asia is also expected to expand at a higher rate in the next five years. This is due to the rising awareness about therapeutic applications of growth factors in the treatment of chronic diseases in the region. In addition, increasing prevalence of chronic diseases and growing aging population are driving the expansion of the growth factors market in the region. Growing demographics and economies in developing countries, such as India and China, are expected to lead to the rise in the growth factors market in Asia. Moreover, India, China, and Japan, are expected to be the fastest growing markets for growth factors in the region. Increasing prevalence of chronic diseases and rising awareness about therapeutic applications of growth factors in treatment of various diseases are among the major driving factors for the global growth factors market. Also, increasing research in the field of synthetic blood growth factor has propelled the growth of the global growth factors market. Risk and complications associated with synthetic growth factors in treatment of diseases is a key restraint for the global growth factors market. In addition, the imposition of stringent regulations for the approval of synthetic growth factors inhibits the growth of the market. Rapid product launches and increasing number of mergers and acquisitions between growth factors manufacturing companies are some of the major trends observed in the market. The major companies operating in this market are Wockhardt Ltd., F. Hoffmann-La Roche AG, Alseres Pharmaceuticals, Inc., Bayer HealthCare Pharmaceuticals Inc., Amgen Inc., BioMimetic Therapeutics Inc., Ceregene, Inc., FibroGen, Inc., Novo Nordisk A/S, Johnson & Johnson Limited, Merck Serono International S.A., PeproTech Inc., NsGene A/S, Insmed Inc., Reliance GeneMedix Plc., and Lonza Group. Key geographies evaluated in this report are:
Bartus R.T.,Ceregene |
Brown L.,Ceregene |
Wilson A.,Ceregene |
Kruegel B.,Ceregene |
And 4 more authors.
Neurobiology of Disease | Year: 2011
Recent analyses of autopsied brains from subjects previously administered AAV2-neurturin (NRTN) gene transfer argues that optimizing the effects of neurotrophic factors in Parkinson's disease (PD) likely requires delivery to both the degenerating cell bodies (in substantia nigra) and their terminals (in striatum). Prior to implementing this novel dosing paradigm in humans, we conducted eight nonclinical experiments with three general objectives: (1) evaluate the feasibility, safety and effectiveness of targeting the substantia nigra (SN) with AAV2-NRTN, (2) better understand and appraise recent warnings of serious weight loss that might occur with targeting the SN with neurotrophic factors, and (3) define an appropriate dose of AAV2-NRTN that should safely and effectively cover the SN in PD patients. Toward these ends, we first determined SN volume for rats, monkeys and humans, and employed these values to calculate comparable dose equivalents for each species by scaling each dose, based on relative SN volume. Using this information, we next injected AAV2-GFP to monkey SN to quantify AAV2-vector distribution and confirm reasonable SN coverage. We then selected and administered a ~. 200-fold range of AAV2-NRTN doses (and a single AAV2-GDNF dose) to rat SN, producing a wide range of protein expression. In contrast to recent warnings regarding nigra targeting, no dose produced any serious side effects or toxicity, though we replicated the modest reduction in weight gain reported by others with the highest AAV2-NRTN and the AAV2-GDNF dose. A dose-related increase in NRTN expression was seen, with the lower doses limiting NRTN to the peri-SN and the highest dose producing mistargeted NRTN well outside the SN. We then demonstrated that the reduction in weight gain following excessive-doses can be dissociated from NRTN in the targeted SN, and is linked to mistargeted NRTN in the diencephalon. We also showed that prior destruction of the dopaminergic SN neurons via 6-OHDA had no impact on the weight loss phenomenon, further dissociating neurotrophic exposure to the SN as the culprit for weight changes. Finally, low AAV2-NRTN doses provided significant neuroprotection against 6-OHDA toxicity, establishing a wide therapeutic index for nigral targeting. These data support targeting the SN with AAV2-NRTN in PD patients, demonstrating that properly targeted and scaled AAV2-NRTN provides safe and effective NRTN expression. They also provided the means to define an appropriate human-equivalent dose for proceeding into an ongoing clinical trial, using empirically-based scaling to account for marked differences in SN volume between species. © 2011 Elsevier Inc.
Herzog C.D.,Ceregene |
Brown L.,Ceregene |
Kruegel B.R.,Ceregene |
Wilson A.,Ceregene |
And 4 more authors.
Neurobiology of Disease | Year: 2013
This paper reassesses the currently accepted viewpoint that targeting the terminal fields (i.e. striatum) of degenerating nigrostriatal dopamine neurons with neurotrophic factors in Parkinson's disease (PD) is sufficient for achieving an optimal neurotrophic response. Recent insight indicating that PD is an axonopathy characterized by axonal transport deficits prompted this effort. We tested whether a significantly greater neurotrophic response might be induced in SN neurons when the neurotrophic factor neurturin (NRTN) is also targeted to the substantia nigra (SN), compared to the more conventional, striatum-only target. While recognizing the importance of maintaining the integrity of nigrostriatal fibers and terminals (especially for achieving optimal function), we refocused attention to the fate of SN neurons. Under conditions of axonal degeneration and neuronal transport deficits, this component of the nigrostriatal system is most vulnerable to the lack of neurotrophic exposure following striatal-only delivery. Given the location of repair genes induced by neurotrophic factors, achieving adequate neurotrophic exposure to the SN neurons is essential for an optimal neurotrophic response, while the survival of these neurons is essential to the very survival of the fibers. Two separate studies were performed using the 6-OHDA model of nigrostriatal degeneration, in conjunction with delivery of the viral vector AAV2-NRTN (CERE-120) to continuously express NRTN to either striatum or nigra alone or combined striatal/nigral exposure, including conditions of ongoing axonopathy. These studies provide additional insight for reinterpreting past animal neurotrophic/6-OHDA studies conducted under conditions where axon transport deficiencies were generally not accounted for, which suggested that targeting the striatum was both necessary and sufficient. The current data demonstrate that delivering NRTN directly to the SN produces 1) expanded NRTN distribution within the terminal field and cell bodies of targeted nigrostriatal neurons, 2) enhanced intracellular neurotrophic factor signaling in the nigrostriatal neurons, and 3) produced greater numbers of surviving dopamine neurons against 6-OHDA-induced toxicity, particularly under the conditions of active axonopathy. Thus, these data provide empirical support that targeting the SN with neurotrophic factors (in addition to striatum) may help enhance the neurotrophic response in midbrain neurons, particularly under conditions of active neurodegeneration which occurs in PD patients. © 2013 Elsevier Inc.
Neurobiology of Disease | Year: 2012
While the therapeutic potential of neurotrophic factors has been well-recognized for over two decades, attempts to translate that potential to the clinic have been disappointing, largely due to significant delivery obstacles. Similarly, gene therapy (or gene transfer) emerged as a potentially powerful, new therapeutic approach nearly two decades ago and despite its promise, also suffered serious setbacks when applied to the human clinic. As advances continue to be made in both fields, ironically, they may now be poised to complement each other to produce a translational breakthrough. The accumulated data argue that gene transfer provides the 'enabling technology' that can solve the age-old delivery problems that have plagued the translation of neurotrophic factors as treatments for chronic central nervous system diseases.A leading translational program applying gene transfer to deliver a neurotrophic factor to rejuvenate and protect degenerating human neurons is CERE-120 (AAV2-NRTN). To date, over two dozen nonclinical studies and three clinical trials have been completed. A fourth (pivotal) clinical trial has completed all dosing and is currently evaluating safety and efficacy. In total, eighty Parkinson's disease (PD) subjects have thus far been dosed with CERE-120 (some 7. years ago), representing over 250 cumulative patient-years of exposure, with no serious safety issues identified. In a completed sham-surgery, double-blinded controlled trial, though the primary endpoint (the Unified Parkinson's Disease Rating Scale (UDPRS) motor off score measured at 12. months) did not show benefit from CERE-120, several important motor and quality of life measurements did, including the same UPDRS-motor-off score, pre-specified to also be measured at a longer, 18-month post-dosing time point. Importantly, not a single measurement favored the sham control group. This study therefore, provided important, well-controlled evidence establishing 'clinical proof of concept' for gene transfer to the CNS and the first controlled evidence for clinical benefit of a neurotrophic factor in a human neurodegenerative disease.This paper reviews the development of CERE-120, starting historically with the long-standing interest in the therapeutic potential of neurotrophic factors and continuing with selective accounts of past efforts to translate their potential to the clinic, eventually leading to the application of gene transfer and its role as the 'enabling technology'. Because of growing interest in translational R&D, including its practice in industry, the paper is uniquely oriented from the author's personal, quasi-autobiographic perspective and career-long experiences conducting translational research and development, with a focus on various translational neurotrophic factor programs spanning 30. + years in Big Pharma and development-stage biotech companies. It is hoped that by sharing these perspectives, practical insight and information might be provided to others also interested in translational R&D as well as neurotrophic factors and gene therapy, offering readers the opportunity to benefit from some of our successes, while possibly avoiding some of our missteps. © 2012 Elsevier Inc.
Bartus R.T.,Ceregene |
Baumann T.L.,Ceregene |
Brown L.,Ceregene |
Kruegel B.R.,Ceregene |
And 2 more authors.
Neurobiology of Aging | Year: 2013
Neurotrophic factors have long shown promise as potential therapies for age-related neurodegenerative diseases. However, 20 years of largely disappointing clinical results have underscored the difficulties involved with safely and effectively delivering these proteins to targeted sites within the central nervous system. Recent progress establishes that gene transfer can now likely overcome the delivery issues plaguing the translation of neurotrophic factors. This may be best exemplified by adeno-associated virus serotype-2-neurturin (CERE-120), a viral-vector construct designed to deliver the neurotrophic factor, neurturin to degenerating nigrostriatal neurons in Parkinson's disease. Eighty Parkinson's subjects have been dosed with CERE-120 (some 7+ years ago), with long-term, targeted neurturin expression confirmed and no serious safety issues identified. A double-blind, controlled Phase 2a trial established clinical "proof-of-concept" via 19 of the 24 prescribed efficacy end points favoring CERE-120 at the 12-month protocol-prescribed time point and all but one favoring CERE-120 at the 18-month secondary time point (p = 0.007 and 0.001, respectively). Moreover, clinically meaningful benefit was seen with CERE-120 on several specific protocol-prescribed, pairwise, blinded, motor, and quality-of-life end points at 12 months, and an even greater number of end points at 18 months. Because the trial failed to meet the primary end point (Unified Parkinson's Disease Rating Scale motor-off, measured at 12 months), a revised multicenter Phase 1/2b protocol was designed to enhance the neurotrophic effects of CERE-120, using insight gained from the Phase 2a trial. This review summarizes the development of CERE-120 from its inception through establishing "clinical proof-of-concept" and beyond. The translational obstacles and issues confronted, and the strategies applied, are reviewed. This information should be informative to investigators interested in translational research and development for age-related and other neurodegenerative diseases. © 2013.
Ceregene | Date: 2011-04-01
A specific clinical protocol for use toward therapy of defective, diseased and damaged neurons in the mammalian brain, of particular usefulness for treatment of neurodegenerative conditions such as Parkinsons disease. The protocol is practiced by directly delivering a definite concentration of a nerve growth factor via delivery of the protein, an expression vector operably encoding the nerve growth factor, or grafting a donor cell containing such an expression vector into the substantia nigra and preferably also the striatum. The method stimulates growth of targeted neurons, and reversal of functional deficits associated with the neurodegenerative disease being treated.