A Amiotrofia Espinhal Progressiva (AEP) é uma doença autossômica recessiva que afeta os motoneurônios do corno anterior da medula espinhal, acarretando hipotonia e fraqueza muscular. A partir do conhecimento do mecanismo molecular da AEP, abriu-se um campo para testes clínicos com agentes farmacológicos que possam aumentar o nível da proteína SMN2. Diversas drogas com esta ação estão sendo testadas na tentativa de encontrar um possível tratamento para esta trágica doença. O ácido valpróico (AV), droga muito utilizada para o tratamento da epilepsia mostrou ter a propriedade de ativar o promotor do gene da proteína SMN2, aumentando a sua produção. Tendo em vista que não há uniformização do sistema de avaliação clínica dos resultados do tratamento em diferentes países, foi elaborado um protocolo selecionando métodos de avaliação fáceis, rápidos e já validados a fim de verificar se o AV é eficaz para manter ou melhorar a força muscular dos pacientes com AEP. Os métodos selecionados foram: escala Medical Research Council (MRC) para força muscular; Hammersmith motor ability score para habilidade motora; goniometria das principais articulações; cronometragem de tempo despendido para deambular, quando possível; índice de Barthel para atividades da vida diária e, por fim, um questionário para verificar as modalidades de fisioterapia e hidroterapia em uso. Vinte e dois pacientes com AEP tipo II e III, com idades variando de 2 a 18 anos, medicados com AV, foram avaliados a cada três meses durante um ano, totalizando cinco visitas, das quais a primeira ocorreu nos dias anteriores ao início do tratamento. Os resultados dos testes demonstraram que, durante o seguimento de um ano, os pacientes obtiveram melhora na habilidade motora, porém não na força muscular, o que é um resultado extremamente positivo. Crianças com idade menor ou igual a 6 anos mostraram melhores ganhos quanto à habilidade motora. / Spinal Muscular Atrophy (SMA) is an autosomal recessive disorder that affects the spinal motoneurons, resulting in hypotonia and muscle weakness. The knowledge of the molecular mechanism of SMA has originated new researches including clinical trials with pharmacological agents that increase SMN2 protein level. Many drugs with this action are being tested with the aim of finding a possible treatment for this severe disease. The valproic acid (VA), a well-known drug used to treat epilepsy has the property of activating the SMN2 gene promoter and then to increase SMN2 protein level. Since there isnt an uniform system for the clinical evaluation of the treatment results, we selected a set of easy, fast and already validated methods to evaluate if the VA is effective to stabilize or improve the motor function in patients with SMA. The selected methods were: Medical Research Council scale (MRC) to muscular strength; Hammersmith motor ability score to motor ability; goniometry of the main joints; time to walk when possible; Barthel índex for daily activities, and a questionnaire to verify the types of physiotherapy and hydrotherapy in use. Twenty two patients with SMA II and III, aged between 2 and 19 years, and treated with VA were evaluated every three months during the period of one year; the first evaluation occurred immediately before the onset of the treatment. The results of the tests demonstrated that along the period of 12 months the patients didnt gain muscle strength but improved their motor ability, that can be considered a positive result. Children aged six years or younger had a higher gain in motor ability along the period of the study.

Les techniques de criblage actuelles (in vitro et in silico) sont dépendantes des efforts menés en biologie médicinale pour identifier des cibles biologiques pertinentes ; cibles difficiles à définir pour les maladies génétiques dites "perte de fonction". De plus, les composés issus de ces cribles s'avèrent souvent inefficaces et/ou toxiques une fois confrontés à la complexité physiologique d'un organisme entier. Pour contourner ce problème, nous proposons d'utiliser le nématode C. elegans, notamment pour des maladies répondant aux critères suivants : i) physiopathologie complexe et/ou mal comprise excluant le développement à court terme de médicaments sur une base rationnelle, ii) peu d'espoir de thérapie génique/cellulaire à court terme, iii) conservation chez C. elegans du gène relié à la maladie humaine et induisant un phénotype exploitable une fois inactivé. Nous démontrons ici que ce petit nématode permet de tester, à moindre coût, un grand nombre de composés chimiques tout en conservant la complexité physiologique d'un animal entier. De plus, la souplesse génétique de cet animal permet d'apporter rapidement des informations sur le mode d'action des composés identifiés. Ainsi, en plus du but initial visant à identifier des molécules bioactives à intérêt thérapeutique, cette approche peut permettre de dégager de nouvelles cibles moléculaires utiles pour l'industrie chimique, et cruciales pour la recherche de traitements contre les maladies perte de fonction. Finalement, nous présentons comment mettre en place une telle stratégie, notamment pour la myopathie de Duchenne, l'amyotrophie spinale et le syndrome de Schwartz-Jampel. Enfin, nous présentons les résultats obtenus lors des différentes campagnes de criblage, les validations des molécules les plus prometteuses et les travaux effectués pour tenter de comprendre leur mode d'action chez le nématode.

The scope of this dissertation focuses on issues related to the quality of life of children suffering with spinal muscular atrophy (SMA) and their carers and the associated social impact on families affected by this progressive and incurable disease. It describes ethical aspects of help to families with SMA and serious decisions in relation to the need to connect to artificial ventilation. Spinal Muscular Atrophy - SMA is a motoneuron disease i.e. disease of neurons, which are responsible for conscious movements of muscles e.g. running, head movement and swallowing. The prevalence is approximately 1 newborn for 6000 live births and approximately 1 person of 40 people is the carrier of the disease. SMA affects all the bone muscles i.e. proximal muscles are often affected the most. Everyone affected is in some point in life, depending on stage and type, reliant on mechanical or electrical wheelchair, in many cases also on artificial ventilation and permanent 24hr care. Families affected by this illness accept the fact of this progressive and incurable illness differently, this dissertation reflects upon such different perceptions on quality of life of the affected children, the carers. It forms a contribution in building a foundation for organising multi-discipline teams of experts with sole purpose of therapeutical interventions, to support the child and his/hers family. The World Health Organization (WHO) defines palliative care as "improving quality of life of patients facing life-threatening illnesses, and their families, through the prevention and relief of suffering by early identification and treatment of pain and other problems, whether physical, psychological, social or spiritual." Palliative care prepares families for these situations and should be provided along with whatever treatment options families choose. This dissertation is a comprehensive information base to support children affected by SMA and their families in early care in Czech Republic and in the process of inclusive educational integration into mainstream society.

A miosite por corpos de inclusão (inclusion body myositis - IBM), na sua forma esporádica, é considerada a miopatia adquirida mais comum após os 50 anos de idade. Embora seja incluída no grupo das miopatias inflamatórias, estudos recentes mostram um processo particular de degeneração muscular caracterizado por deposição anormal de agregados de proteínas nas fibras musculares e funcionamento anormal dos principais sistemas de degradação proteica. O objetivo deste estudo foi o de avaliar os aspectos clínicos, histológicos e imunoistoquímicos de pacientes com IBM. Avaliamos 18 casos com diagnóstico de IBM de dois dos principais centros de doenças neuromusculares do Brasil (25 biópsias musculares). Na tentativa de diferenciar os casos de IBM das outras miopatias inflamatórias, determinamos o padrão de expressão tecidual da p-tau (p62), alfa-sinucleína e TDP-43. Também foi avaliada a função lisossomal através da reação da fosfatase ácida (marcação da atividade lisossomal global) e determinação da marcação para LC3B (marcador de autofagia). Foi observado que a IBM predominou no sexo masculino (61% dos casos), da cor branca, com início das manifestações clínicas ao redor dos 59 anos de idade e os sintomas mais frequentes foram fraqueza muscular, instabilidade postural com quedas da própria altura, disfagia e perda ponderal, podendo ainda apresentar dispneia. O diagnóstico demorou em média 7,4 anos após o início dos sintomas e frequentemente esteve associada às seguintes comorbidades: hipertensão arterial sistêmica, diabetes mellitus tipo 2, osteopenia / osteoporose, dislipidemia e hiperuricemia / gota. O padrão de comprometimento muscular na IBM foi caracterizado por tetraparesia de predomínio proximal em membros inferiores e distal em membros superiores. Os valores séricos da creatinofosfoquinase em pelo menos uma das medições foram elevados em todos os pacientes, porém sem ultrapassar 10 vezes o limite superior da normalidade. O uso de imunossupressão não se mostrou eficaz nos pacientes com IBM. Os achados histológicos na IBM incluíram alterações distróficas variáveis com a presença de inflamação endomisial, assim como a ocorrência de vacúolos marginados, além da elevada frequência de alterações mitocondriais. Outros achados histológicos musculares característicos na IBM foram o aumento da atividade lisossomal (aumento global da marcação para fosfatase ácida), a presença de marcação positiva para beta-amilóide (marcação intra-vacuolar pelo vermelho-Congo), o aumento na degradação muscular (relacionada com ativação de LC3B, p-tau, e p62/SQSTM1) e a degeneração muscular (marcação para anti-phospo TDP-43 e para ?-sinucleína). Tais alterações apresentaram alta sensibilidade e especificidade. Sugerimos que a redução do critério de idade do início dos sintomas de mais de 45 anos para mais de 35 anos aumentaria a sensibilidade diagnóstica para os casos com IBM deste estudo de 83% para 100%. Com este estudo, foi possível caracterizar clínica e histológicamente pacientes com IBM em nosso meio, e fornecer indícios do benefício do uso de marcadores de degeneração e autofagia para o diagnóstico e para a determinação de vias ou sistemas celulares envolvidos na patogênese da doença / Sporadic inclusion body myositis (sIBM) is considered the most common acquired myopathy affecting adults aged over 50 years. Although included in the group of inflammatory myopathies, recent studies show a particular process of muscle degeneration characterized by abnormal deposit of protein aggregates in muscle fibers and abnormal operation of the main protein degradation systems. The aim of this study was to evaluate the clinical, histological and immunohistochemical patients with IBM. We evaluated 18 cases with IBM diagnostic of two of the main centers of neuromuscular diseases in Brazil (25 muscle biopsies). In an attempt to differentiate the IBM cases of other inflammatory myopathies, we determined the pattern of tissue expression of p-tau (p62), alfa-synuclein and TDP-43. Also evaluated the lysosomal function by acid phosphatase reaction (marking global lysosomal activity) and determining the markup for LC3B (autophagy marker). It was observed that IBM was predominant in males (61% of cases), white colored, with onset of clinical manifestations around 59 years old and the most common symptoms are muscle weakness, postural instability with high falls, dysphagia and weight loss, and may also present dyspnea. The diagnosis took an average of 7.4 years after the onset of symptoms and was often associated with the following comorbidities: hypertension, type 2 diabetes mellitus, osteopenia / osteoporosis, dyslipidemia and hyperuricemia / gout. The muscular damage pattern at IBM was characterized by tetraparesis predominantly proximal lower limbs and distal upper limbs. Serum creatine kinase levels in at least one of the measurements were elevated in all patients, but not exceeding 10 times normal. Immunosuppression was not effective in patients with IBM. The IBM histological findings included diversify dystrophic changes, endomysial inflammation, as well as the occurrence of rimmed vacuoles, in addition to high frequency of mitochondrial changes. Other characteristic muscle histological findings in IBM were increased lysosomal activity (overall increase in labeling for acid phosphatase), the presence of positive staining for beta-amyloid (intra-vacuolar by Congo red marking), increased muscle degradation (related to activation of LC3B, p-tau and p62 / SQSTM1) and muscle degeneration (marking for anti-phospo TDP-43 and ?-synuclein). Such changes have a high sensitivity and specificity. which makes these important complementary analyzes for accurate pathological diagnosis. We suggest that lowering the age of the onset of symptoms of greater than 45 years to older than 35 years would increase the diagnostic sensitivity for cases with IBM this study from 83% to 100%. With this study, it was possible to characterize clinically and histologically the patients with IBM in our centers, and provide evidence of the benefit of using degeneration and autophagy markers for diagnosis and for determining pathways or cellular systems involved in the pathogenesis of the disease

A Amiotrofia Espinhal Progressiva (AEP) é uma doença autossômica recessiva que afeta os motoneurônios do corno anterior da medula espinhal, acarretando hipotonia e fraqueza muscular. A partir do conhecimento do mecanismo molecular da AEP, abriu-se um campo para testes clínicos com agentes farmacológicos que possam aumentar o nível da proteína SMN2. Diversas drogas com esta ação estão sendo testadas na tentativa de encontrar um possível tratamento para esta trágica doença. O ácido valpróico (AV), droga muito utilizada para o tratamento da epilepsia mostrou ter a propriedade de ativar o promotor do gene da proteína SMN2, aumentando a sua produção. Tendo em vista que não há uniformização do sistema de avaliação clínica dos resultados do tratamento em diferentes países, foi elaborado um protocolo selecionando métodos de avaliação fáceis, rápidos e já validados a fim de verificar se o AV é eficaz para manter ou melhorar a força muscular dos pacientes com AEP. Os métodos selecionados foram: escala Medical Research Council (MRC) para força muscular; Hammersmith motor ability score para habilidade motora; goniometria das principais articulações; cronometragem de tempo despendido para deambular, quando possível; índice de Barthel para atividades da vida diária e, por fim, um questionário para verificar as modalidades de fisioterapia e hidroterapia em uso. Vinte e dois pacientes com AEP tipo II e III, com idades variando de 2 a 18 anos, medicados com AV, foram avaliados a cada três meses durante um ano, totalizando cinco visitas, das quais a primeira ocorreu nos dias anteriores ao início do tratamento. Os resultados dos testes demonstraram que, durante o seguimento de um ano, os pacientes obtiveram melhora na habilidade motora, porém não na força muscular, o que é um resultado extremamente positivo. Crianças com idade menor ou igual a 6 anos mostraram melhores ganhos quanto à habilidade motora. / Spinal Muscular Atrophy (SMA) is an autosomal recessive disorder that affects the spinal motoneurons, resulting in hypotonia and muscle weakness. The knowledge of the molecular mechanism of SMA has originated new researches including clinical trials with pharmacological agents that increase SMN2 protein level. Many drugs with this action are being tested with the aim of finding a possible treatment for this severe disease. The valproic acid (VA), a well-known drug used to treat epilepsy has the property of activating the SMN2 gene promoter and then to increase SMN2 protein level. Since there isnt an uniform system for the clinical evaluation of the treatment results, we selected a set of easy, fast and already validated methods to evaluate if the VA is effective to stabilize or improve the motor function in patients with SMA. The selected methods were: Medical Research Council scale (MRC) to muscular strength; Hammersmith motor ability score to motor ability; goniometry of the main joints; time to walk when possible; Barthel índex for daily activities, and a questionnaire to verify the types of physiotherapy and hydrotherapy in use. Twenty two patients with SMA II and III, aged between 2 and 19 years, and treated with VA were evaluated every three months during the period of one year; the first evaluation occurred immediately before the onset of the treatment. The results of the tests demonstrated that along the period of 12 months the patients didnt gain muscle strength but improved their motor ability, that can be considered a positive result. Children aged six years or younger had a higher gain in motor ability along the period of the study.

Skeletal muscle wasting is a consequence of numerous physiological conditions, including denervation, corticosteroid treatment, immobilization, and aging. The E3 ubiquitin ligases, MuRF1 and MAFbx, are induced under nearly all atrophy conditions and are believed to play a key role in protein degradation in atrophying muscle. However, the preliminary data described in this study provides new evidence that MuRF1 may also act as a transcriptional modulator of atrophy-induced gene activity, including the regulation of MAFbx and MuRF1 expression. To characterize the transcriptional regulation of MuRF1 and MAFbx, reporter gene constructs containing fragments of the proximal promoter regions of these genes were developed, transfected into C2C12 cells with or without a MuRF1 expression plasmid and monitored for differences in reporter gene activity. The MuRF1 and MAFbx reporters each showed repressed activity in cells ectopically expressing MuRF1 compared to cells that did not overexpress MuRF1. Furthermore, ectopic expression of the myogenic regulatory factors (MRFs), MyoD1 and myogenin, caused significant activation of the MuRF1 and MAFbx reporter constructs. However, co-overexpression of MuRF1 with MyoD1 or myogenin resulted in reversal of MRF induction of reporter gene activity, and synergistic repression of a constructed E-box reporter system. To further characterize the role of the MuRF1 gene product in repression of MuRF1 expression, a MuRF1 RING domain mutant and a MuRF1 c-terminal mutant were created. The mutant constructs were then co-transfected along with MRF expression plasmids and the MuRF1 reporter construct into C2C12 cells and reporter gene activity was assessed. The MuRF1 RING mutant failed to reverse MRF activation of the reporter gene, while the c-terminal mutant successfully reversed activation of the reporter gene. These findings suggest that ubiquitin ligase activity is required for MuRF1 transcriptional regulatory effects. These data offer exciting evidence of a potential new function for MuRF1 as a transcriptional modulator of atrophy-induced changes in gene expression.

Barn med Spinal muskelatrofi lever ett liv med begränsad rörlighet. Deras vardag innehåller att mycket träning med syfte att kunna leva ett bättre liv. I vår digitala värld finns det idag många digitala spel som syftar till träning, exempelvis Nintendo Wii-spel och det populära spelet Just Dance. Utan att vi tänker på det, tränar vi kroppen medan vi utför spelets olika moment. Men hur kan barn bibehålla motivation och hur kan immersion uppstå för att barn ska glömma rum och tid när dem tränar? Vi har i vår studie samarbetat med företaget Nordic Forest Games, som på uppdrag av ett läkemedelsföretag, utvecklar ett mobilspel för barn med Spinal muskelatrofi. Vi har undersökt vilka egenskaper ett digitalt spel bör ha för att inte upplevs som enbart träning. I studien deltar två fysioteraputer och fyra föräldrar med syfte att beskriva sina upplevelser kring deras barns vardag och hur träning och motivation upplevs. Vid analys av data har teorin Hedonic Motivation System Adoption Model (HMSAM) tillämpats för att kunna ringa in vilka olika områden som är central hos barnen för att uppleva immersion och motivation. Resultatet i studien är inte generaliserbart på grund av dels det låga antalet deltagare i studien och dels med tanke på att Spinal muskelatrofi är en ovanlig sjukdom av stor variation och mycket individuell. Utan att kunna dra någon generell slutsats har vi kunnat urskilja delar som är intressanta att studera vidare när det gäller tävlingsmoment och inkludering. Av företaget fick vi även tillgång till en prototyp av spelet. För att utvärdera prototypen gjordes en heuristisk utvärdering i enlighet med att finna användbarhetsproblem genom att se på prototypen genom Nielsens tio heuristiska riktlinjer. Med dessa två kvalitativa metoder har studien antagit en kvalitativ ansats där resultaten sedan kopplats samman med teorin HMSAM. / Children with spinal muscular atrophy live a life of limited mobility. Their everyday life includes a lot of exercise with the goal of being able to live a better life. In our digital world today, there are many digital games aimed at training, such as Nintendo Wii games and the popular game Just Dance. Without thinking about it, we train the body while performing the various steps of the game. But how can children maintain motivation and how can immersion occur for children to forget space and time when they exercise? In our study, we collaborated with the company Nordic Forest Games, which on behalf of a pharmaceutical company, develops a mobile game for children with spinal muscular atrophy. We have investigated what qualities a digital game should have in order not to be perceived as just training. Two physiotherapists and four parents participate in the study with the aim of describing their experiences of their children's everyday life and how exercise and motivation are experienced. When analyzing data, the Hedonic Motivation System Adoption Model (HMSAM) theory has been applied in order to be able to delineate which different areas are central to children in order to experience immersion and motivation. The result of the study is not generalizable due partly to the low number of participants in the study and partly given that Spinal muscular atrophy is an unusual disease of great variety and very individual. Without being able to draw any general conclusions, we have been able to distinguish parts that are interesting to study further in terms of competition elements and inclusion. The company also gave us access to a prototype of the game. To evaluate the prototype, an heuristic evaluation was made in accordance with finding usability problems by looking at the prototype through Nielsen's ten heuristic guidelines. With these two qualitative methods, the study has adopted a qualitative approach where the results are then linked to the theory HMSAM.

Situation of families in which a child with spinal muscular atrophy was born, is the topic of this thesis. This rare genetic disease affects neuromuscular system of children and shortens their lives. In most severe cases the failure of respiratory functions comes in the first year of child's life. This thesis is focused on support that Czech system of social and medical services provides to families with this disease. Next, it looks into needs of these families and examine the extent to which the system is able to saturate them. Very important point in this research is also families' perception of quality of care. The research was implemented with use of qualitative methods, mostly by semi-structured interviews which followed families' journey through the system of social and medical services. Then there is a comparison of experience of families with theories, policy and other normative framework and suggestion of steps that should be taken to improve families' satisfaction with services they receive concerning the child's disease. Key words: spinal muscular atrophy, rare diseases, patient's autonomy, patient- centered care, patient journey, quality of care.

Spinal muscular atrophy (SMA) is an autosomal recessive neurodegenerative disorder that is the leading genetic cause of infantile death. SMA is caused by homozygous deletion or mutation of the survival of motor neuron 1 gene (SMN1). The SMN2 gene is nearly identical to SMN1, however is alternatively spliced. The close relationship to SMN1 results in SMN2 being a very power genetic modifier of SMA disease severity and a target for therapies. In this study we attempt to characterize novel chemical compounds identified as potential activators of the SMN2 gene. Additionally, we sought to determine the regulatory role individual HDAC proteins use to control expression of full length protein from the SMN2 gene. We used quantitative PCR to determine the effects of novel compounds and shRNA silencing of individual HDACs on the steady state levels of a SMN2-luciferase reporter transcripts. We determined that the compounds identified in multiple reporter high throughput screens increased SMN protein levels via transcriptional activation of the SMN2 gene. Other compounds identified in the same screen functioned post-transcriptionally, possibly stabilizing the SMN protein itself by decreasing degradation. Furthermore, we determined that reduction of individual HDAC proteins was sufficient to increase SMN protein levels in a transgenic reporter system. Knockdown of class I HDAC proteins preferentially activated the reporter by increased promoter transcription. Silencing of class II HDAC proteins maintained transcriptional activity; however silencing of HDAC 5 and 6 also appeared to enhance inclusion of an alternatively spliced exon. This collective work defines a quantitative RNA based protocol to determine mechanism of SMN reporter increase in response to any chosen treatment method. Additionally, this work highlights HDAC proteins 2 and 6 as excellent investigative targets. These data are important to the basic understanding of SMN expression regulation and the refinements of current therapeutic compounds as well as the development of novel SMA therapeutics.

No description available.