Functional Diagnostics in Mitochondrial Diseases |
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Authors: | Gabriele Siciliano Leda Volpi Selina Piazza Giulia Ricci Michelangelo Mancuso Luigi Murri |
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Institution: | (1) Department of Neuroscience, Section of Neurology, University of Pisa, Via Roma 67, 56126 Pisa, Italy |
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Abstract: | Mitochondrial diseases (MD) with respiratory chain defects are caused by genetic mutations that determine an impairment of
the electron transport chain functioning. Diagnosis often requires a complex approach with measurements of serum lactate,
magnetic resonance spectroscopy (MRS), muscle histology and ultrastructure, enzymology, genetic analysis, and exercise testing.
The ubiquitous distribution of the mitochondria in the human body explains the multiple organ involvement. Exercise intolerance
is a common symptom of MD, due to increased dependence of skeletal muscle on anaerobic metabolism, with an excess lactate
generation, phosphocreatine depletion, enhanced free radical production, reduced oxygen extraction and electron flux through
the respiratory chain. MD treatment has included antioxidants (vitamin E, alpha lipoic acid), coenzyme Q10, riboflavin, creatine
monohydrate, dichloroacetate and exercise training. Exercise is a particularly important tool in diagnosis as well as in the
management of these diseases. |
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Keywords: | Mitochondrial myopathy Exercise Muscle fatigue |
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