BB-OPMD-202 is a randomized, double-blind, placebo-controlled study of IV trehalose for treatment of OPMD. The study includes a 4-week screening period, a 24-week blinded treatment period during which patients will receive weekly infusions of trehalose or placebo, followed by a 24-week open-label extension period during which all patients will receive weekly infusions of trehalose. Patients will undergo a safety follow-up assessment 4 weeks after their last treatment.

开始日期2017-06-15

申办/合作机构

Bioblast Pharma Ltd.

NCT02725957 / Completed临床1期

A Single Center, Single Ascending Dose, Double-Blind, Randomized, Placebo-Controlled Trial to Establish Safety and the Maximum Tolerated Dose of Intravenous Trehalose Solution in Healthy Subjects

This will be a double-blind, randomized, placebo-controlled, single ascending dose study performed in healthy subjects.
The study will include up to four escalating dose cohorts with eight (8) subjects in each cohort.
In each cohort, eligible subjects will be randomized in a 3:1 ratio to receive single IV administration of 9% trehalose (Treatment Arm 1) or placebo (Treatment Arm 2).
All subjects, regardless of their treatment arm assignment, will undergo the same evaluations and will receive the study drug at the clinic. Each subject will continue to be followed for one week post dosing.

开始日期2016-03-01

申办/合作机构

Bioblast Pharma Ltd.

[+1]

NCT02328482 / Completed临床3期

A Pivotal, Multicenter, Open-label, Randomized Withdrawal, Non-Treatment Concurrent Control Study to Assess the Safety, Tolerability, and Efficacy of Cabaletta® in OPMD Patients Who Participated in Study BBCO-001

This will be a multi-center, randomized withdrawal, open-label, non-treatment concurrent control, parallel group study. Patients completing protocol BBCO-001 will be offered the opportunity to enter into this 12-month randomized withdrawal protocol.

开始日期2015-01-01

申办/合作机构

Bioblast Pharma Ltd.

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项与 Bioblast Pharma Ltd. 相关的文献（医药）

2022-12-01·Acta Neuropathologica

Assessment of PABPN1 nuclear inclusions on a large cohort of patients and in a human xenograft model of oculopharyngeal muscular dystrophy

Article

作者: Boulinguiez, Alexis ; Roth, Fanny ; O'Ferrall, Erin K ; Dhiab, Jamila ; Rouche, Andrée ; Marhic, Alix ; Mouigni, Hadidja-Rose ; Negroni, Elisa ; Oliver, Alison ; Mouly, Vincent ; Blumen, Sergiu ; van Engelen, Baziel ; Lassche, Saskia ; Trollet, Capucine ; Ottenheijm, Coen ; Butler-Browne, Gillian ; Lainé, Jeanne ; Lacau St Guily, Jean ; Muraine, Laura ; Greif, Hagar ; Perie, Sophie

AbstractOculopharyngeal muscular dystrophy (OPMD) is a rare muscle disease characterized by an onset of weakness in the pharyngeal and eyelid muscles. The disease is caused by the extension of a polyalanine tract in the Poly(A) Binding Protein Nuclear 1 (PABPN1) protein leading to the formation of intranuclear inclusions or aggregates in the muscle of OPMD patients. Despite numerous studies stressing the deleterious role of nuclear inclusions in cellular and animal OPMD models, their exact contribution to human disease is still unclear. In this study, we used a large and unique collection of human muscle biopsy samples to perform an in-depth analysis of PABPN1 aggregates in relation to age, genotype and muscle status with the final aim to improve our understanding of OPMD physiopathology. Here we demonstrate that age and genotype influence PABPN1 aggregates: the percentage of myonuclei containing PABPN1 aggregates increases with age and the chaperone HSP70 co-localize more frequently with PABPN1 aggregates with a larger polyalanine tract. In addition to the previously described PRMT1 and HSP70 co-factors, we identified new components of PABPN1 aggregates including GRP78/BiP, RPL24 and p62. We also observed that myonuclei containing aggregates are larger than myonuclei without. When comparing two muscles from the same patient, a similar amount of aggregates is observed in different muscles, except for the pharyngeal muscle where fewer aggregates are observed. This could be due to the peculiar nature of this muscle which has a low level of PAPBN1 and contains regenerating fibers. To confirm the fate of PABPN1 aggregates in a regenerating muscle, we generated a xenograft model by transplanting human OPMD muscle biopsy samples into the hindlimb of an immunodeficient mouse. Xenografts from subjects with OPMD displayed regeneration of human myofibers and PABPN1 aggregates were rapidly present—although to a lower extent-after muscle fiber regeneration. Our data obtained on human OPMD samples add support to the dual non-exclusive models in OPMD combining toxic PABPN1 intranuclear inclusions together with PABPN1 loss of function which altogether result in this late-onset and muscle selective disease.

2020-12-01·Journal of Translational Medicine2区 · 医学

Trehalose alleviates the phenotype of Machado–Joseph disease mouse models

2区 · 医学

ArticleOA

作者: Santana, Magda M ; Trevino-Garcia, Allyson ; Pereira de Almeida, Luís ; Cavadas, Cláudia ; Paixão, Susana ; Greif, Hagar ; Gaspar, Laetitia S ; Nóbrega, Clévio ; Silva, Teresa Pereira ; Cunha-Santos, Janete ; Nobre, Rui Jorge

AbstractBackgroundMachado–Joseph disease (MJD), also known as spinocerebellar ataxia type 3, is the most common of the dominantly inherited ataxias worldwide and is characterized by mutant ataxin-3 aggregation and neuronal degeneration. There is no treatment available to block or delay disease progression. In this work we investigated whether trehalose, a natural occurring disaccharide widely used in food and cosmetic industry, would rescue biochemical, behavioral and neuropathological features of an in vitro and of a severe MJD transgenic mouse model.MethodsTwo MJD animal models, a lentiviral based and a transgenic model, were orally treated with 2% trehalose solution for a period of 4 and 30 weeks, respectively. Motor behavior (rotarod, grip strength and footprint patterns) was evaluated at different time points and neuropathological features were evaluated upon in-life phase termination.ResultsTrehalose-treated MJD mice equilibrated for a longer time in the rotarod apparatus and exhibited an improvement of ataxic gait in footprint analysis. Trehalose-mediated improvements in motor behaviour were associated with a reduction of the MJD-associated neuropathology, as MJD transgenic mice treated with trehalose presented preservation of cerebellar layers thickness and a decrease in the size of ataxin-3 aggregates in Purkinje cells. In agreement, an improvement of neuropathological features was also observed in the full length lentiviral-based mouse model of MJD submitted to 2% trehalose treatment.ConclusionsThe present study suggests trehalose as a safety pharmacological strategy to counteract MJD-associated behavioural and neuropathological impairments.

2018-12-01·Dysphagia2区 · 医学

A Preliminary Videofluoroscopic Investigation of Swallowing Physiology and Function in Individuals with Oculopharyngeal Muscular Dystrophy (OPMD)

2区 · 医学

Article

作者: Waito, Ashley A ; Steele, Catriona M ; Genge, Angela ; Argov, Zohar ; Peladeau-Pigeon, Melanie

Dysphagia is one of the primary symptoms experienced by individuals with Oculopharyngeal Muscular Dystrophy (OPMD). However, we lack understanding of the discrete changes in swallowing physiology that are seen in OPMD, and the resulting relationship to impairments of swallowing safety and efficiency. This study sought to describe the pathophysiology of dysphagia in a small sample of patients with OPMD using a videofluoroscopy examination (VFSS) involving 3 × 5 mL boluses of thin liquid barium (22% w/v). The aim of this study is to extend what is known about the pathophysiology of dysphagia in OPMD, by quantifying changes in swallow timing, kinematics, safety, and efficiency, measured from VFSS. This study is a secondary analysis of baseline VFSS collected from 11 adults (4 male), aged 48-62 (mean 57) enrolled in an industry-sponsored phase 2 therapeutic drug trial. Blinded raters scored the VFSS recordings for safety [Penetration-Aspiration Scale (PAS)], efficiency [Normalized Residue Ratio Scale (NRRS)], timing [Pharyngeal Transit Time (PTT), Swallow Reaction Time (SRT), Laryngeal Vestibule Closure Reaction Time (LVCrt), Upper Esophageal Sphincter Opening Duration (UESD)], and kinematics (hyoid movement, pharyngeal constriction, UES opening width). Impairment thresholds from existing literature were defined to characterize swallowing physiology and function. Further, Fisher's Exact tests and Pearson's correlations were used to conduct a preliminary exploration of associations between swallowing physiology (e.g., kinematics, timing) and function (i.e., safety, efficiency). Compared to published norms, we identified significant differences in the degree of maximum pharyngeal constriction, hyoid movement distance and speed, as well as degree and timeliness of airway closure. Unsafe swallowing (PAS ≥ 3) was seen in only 3/11 patients. By contrast, clinically significant residue (i.e., NRRS scores ≥ 0.09 vallecular; ≥ 0.2 pyriform) was seen in 7/11 patients. Fisher's Exact tests revealed associations between prolonged SRT, PTT, and unsafe swallowing. Weak associations were also identified between post-swallow residue and poor pharyngeal constriction during the swallow. Detailed analysis of swallowing physiology in this series of adults with OPMD aligns with impaired muscular function (e.g., reduced pharyngeal constriction, incomplete laryngeal vestibule closure) associated with the disease, and primary functional challenges with swallow efficiency. Further work is needed to explore a greater range of food and liquid textures, and to identify additional physiological mechanisms underlying swallowing impairment in OPMD.

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