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Molecular mechanisms involved in the process of muscle wasting : human and animal studies

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dc.contributor.author Fermoselle Pérez, Clara, 1985-
dc.contributor.other Barreiro Portela, Esther
dc.contributor.other Universitat Pompeu Fabra. Departament de Ciències Experimentals i de la Salut
dc.date.accessioned 2017-09-27T01:31:50Z
dc.date.available 2017-09-27T01:31:50Z
dc.date.issued 2012-11-26
dc.identifier B. 16714-2013
dc.identifier http://hdl.handle.net/10803/116734
dc.identifier.uri http://hdl.handle.net/10230/20688
dc.description.abstract Muscle dysfunction and muscle wasting are major systemic manifestations of chronic conditions such as Chronic Obstructive Pulmonary Disease (COPD) and cancer. Several biological mechanisms contribute to such a dysfunction. Our objectives were to identify cellular and molecular mechanisms involved in the respiratory and peripheral muscle dysfunction of cachexia models associated with chronic respiratory conditions. The diaphragm and gastrocnemius of mice [emphysema and lung cancer (LC) models] and the vastus lateralis of severe COPD patients were studied with their respective healthy controls. Muscle structure was analyzed in the animal LC model and in the COPD human model. Several biological markers were studied: proteolysis markers, signaling pathways related to proteolysis, redox balance and inflammation. Mitochondrial respiratory chain was also explored in the LC mice model. In all three models the cachectic subjects were identified using total body weight. In patients, fat-free mass index was also identified. In the mouse models, muscle weights were also determined. They were decreased in all cachectic animals compared to the controls. Muscle structure was affected in the cachectic subjects: LC cachectic mice showed a decrease in both type I and II fibers size, while muscle-wasted COPD patients showed a decrease in type II fiber sizes and in proportions of type I fibers. Proportions of myofiber abnormalities were greater in both LC cachectic animals and muscle-wasted COPD patients. Only LC cachectic mice showed higher levels of IFNγ in the diaphragm. Oxidative stress, proteolysis markers and NFκB pathway were enhanced in the muscles of the cachectic subjects in the three models. Mitogen-activated protein kinases (MAPK) and forkhead box (FoxO) signaling pathways were enhanced in the muscles of the cachectic mice. Myogenin levels were reduced in the muscles of all three models. Myostatin levels were greater in the muscles of the cachectic mice. Mitochondrial function was depressed in both respiratory and limb muscles of the LC cachectic mice. We conclude that enhanced protein catabolism and mitochondrial dysfunction occurs in the muscles of these cachexia models (both patients and animals). Major signaling pathways such as NF-kB and FoxO are involved in this process. These findings offer future therapeutic strategies in cachexia associated with chronic respiratory conditions.
dc.format application/pdf
dc.format 77 p.
dc.language.iso eng
dc.publisher Universitat Pompeu Fabra
dc.rights ADVERTIMENT. L'accés als continguts d'aquesta tesi doctoral i la seva utilització ha de respectar els drets de la persona autora. Pot ser utilitzada per a consulta o estudi personal, així com en activitats o materials d'investigació i docència en els termes establerts a l'art. 32 del Text Refós de la Llei de Propietat Intel·lectual (RDL 1/1996). Per altres utilitzacions es requereix l'autorització prèvia i expressa de la persona autora. En qualsevol cas, en la utilització dels seus continguts caldrà indicar de forma clara el nom i cognoms de la persona autora i el títol de la tesi doctoral. No s'autoritza la seva reproducció o altres formes d'explotació efectuades amb finalitats de lucre ni la seva comunicació pública des d'un lloc aliè al servei TDX. Tampoc s'autoritza la presentació del seu contingut en una finestra o marc aliè a TDX (framing). Aquesta reserva de drets afecta tant als continguts de la tesi com als seus resums i índexs.
dc.rights info:eu-repo/semantics/openAccess
dc.source TDX (Tesis Doctorals en Xarxa)
dc.title Molecular mechanisms involved in the process of muscle wasting : human and animal studies
dc.type info:eu-repo/semantics/doctoralThesis
dc.type info:eu-repo/semantics/publishedVersion
dc.date.modified 2017-09-24T10:08:47Z
dc.subject.keyword COPD
dc.subject.keyword Lung cancer
dc.subject.keyword Cachexia
dc.subject.keyword Muscle wasting
dc.subject.keyword MAPK
dc.subject.keyword NFKB
dc.subject.keyword Myostatin
dc.subject.keyword Mitochondrial dysfunction
dc.subject.keyword EPOC
dc.subject.keyword Cáncer de pulmón
dc.subject.keyword Caquéxia
dc.subject.keyword Desgaste muscular
dc.subject.keyword Miostatina
dc.subject.keyword Disfunción mitocondrial
dc.subject.keyword 616.2


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