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Query: UMLS:C0015672 (fatigue)
 51,768 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Rat respiratory muscles underwent considerable changes in histochemical fibre type profile in response to hypo- and hyperthyroidism. Hypothyroidism increased the proportion of type 1 slow oxidative fibres in diaphragm and to a lesser extent in intercostal muscles. Hyperthyroidism resulted in a decreased proportion of type 1 fibres in both diaphragm and intercostals. These changes were broadly comparable to those reported previously in rat limb muscles. In normal rat respiratory muscles, the type 1 fibres were characterized by very high levels of beta-hydroxybutyrate dehydrogenase which was thought to contribute to the fatigue-resistance of these muscles. The type 2B fast glycolytic fibres, and to a lesser extent type 2A fast oxidative fibres, contained high levels of mitochondrial alpha-glycerophosphate dehydrogenase, an enzyme known to be specifically affected in dysthyroid states. The implications of the observed changes in fibre type profile with respect to the oxidative metabolism of rat respiratory muscles are discussed.
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PMID:Changes in histochemical profile of rat respiratory muscles in hypo- and hyperthyroidism. 682 43

Legionella pneumophila is a pathogen widespread in aquatic environment, able to multiply both within amoebae and human macrophages. The aim of this study was to identify genes differently expressed in a spontaneous avirulent Legionella pneumophila serogroup 6 mutant, named Vir-, respect the parental strain (Vir+), and to determine their role in the loss of virulence. Protein profiles revealed some differences in Vir- proteomic maps, and among the identified proteins the undetectable 3-hydroxybutyrate dehydrogenase (BdhA) and a down-produced lipase. Both Legionella enzymes were studied before and were here further characterized at genetic level. A significant down-regulation of both genes was observed in Vir- at the transcriptional level, but the use of defined mutants demonstrated that they did not affect the intracellular multiplication. A mutant (MS1) showed an accumulation of poly-3-hydroxybutyrate (PHB) granules suggesting a role of bdhA gene in its degradation process. The lipase deduced amino acid sequence revealed a catalytic triad, typical of the 'lipase box' characteristic of PHB de-polymerase enzymes, that let us suppose a possible involvement of lipase in the PHB granule degradation process. Our results revealed unexpected alterations in secondary metabolic pathways possibly linking the loss of virulence to Legionella lack of energy sources.
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PMID:Identification and characterization of genes, encoding the 3-hydroxybutyrate dehydrogenase and a putative lipase, in an avirulent spontaneous Legionella pneumophila serogroup 6 mutant. 2555 66