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MACIA-Michael

PhD student

michael.macia@etu.univ-amu.fr
tel : +33 4 91 38 48 07
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Current Research Interest and projects

Publications

2015

Journal Article


  • ABDESSELAM I., PEPINO P., TROALEN T., MACIA M., ANCEL P., MASI B., FOURNY N., GABORIT B., GIANNESINI B., KOBER F., DUTOUR A., BERNARD M. “Time course of cardiometabolic alterations in a high fat high sucrose diet mice model and improvement after GLP-1 analog treatment using multimodal cardiovascular magnetic resonance.”. Journal of Cardiovascular Magnetic Resonance [En ligne]. 06 November 2015. Vol. 17, n°1, p. 95. Disponible sur : < http://dx.doi.org/10.1186/s12968-015-0198-x >
    Résumé : Cardiovascular complications of obesity and diabetes are major health problems. Assessing their development, their link with ectopic fat deposition and their flexibility with therapeutic intervention is essential. The aim of this study was to longitudinally investigate cardiac alterations and ectopic fat accumulation associated with diet-induced obesity using multimodal cardiovascular magnetic resonance (CMR) in mice. The second objective was to monitor cardiac response to exendin-4 (GLP-1 receptor agonist).
    Mots-clés : Cardiovascular magnetic resonance, crmbm, Diabetes, DIO mice model, Longitudinal study, Obesity, Proton-magnetic resonance spectroscopy.

  • MACIA M., PECCHI E., VILMEN C., DESROIS M., LAN C., PORTHA B., BERNARD M., BENDAHAN D., GIANNESINI B. “Insulin Resistance Is Not Associated with an Impaired Mitochondrial Function in Contracting Gastrocnemius Muscle of Goto-Kakizaki Diabetic Rats In Vivo.”. PloS One [En ligne]. 2015. Vol. 10, n°6, p. e0129579. Disponible sur : < http://dx.doi.org/10.1371/journal.pone.0129579 > (consulté le no date)
    Résumé : Insulin resistance, altered lipid metabolism and mitochondrial dysfunction in skeletal muscle would play a major role in type 2 diabetes mellitus (T2DM) development, but the causal relationships between these events remain conflicting. To clarify this issue, gastrocnemius muscle function and energetics were investigated throughout a multidisciplinary approach combining in vivo and in vitro measurements in Goto-Kakizaki (GK) rats, a non-obese T2DM model developing peripheral insulin resistant without abnormal level of plasma non-esterified fatty acids (NEFA). Wistar rats were used as controls. Mechanical performance and energy metabolism were assessed strictly non-invasively using magnetic resonance (MR) imaging and 31-phosphorus MR spectroscopy (31P-MRS). Compared with control group, plasma insulin and glucose were respectively lower and higher in GK rats, but plasma NEFA level was normal. In resting GK muscle, phosphocreatine content was reduced whereas glucose content and intracellular pH were both higher. However, there were not differences between both groups for basal oxidative ATP synthesis rate, citrate synthase activity, and intramyocellular contents for lipids, glycogen, ATP and ADP (an important in vivo mitochondrial regulator). During a standardized fatiguing protocol (6 min of maximal repeated isometric contractions electrically induced at a frequency of 1.7 Hz), mechanical performance and glycolytic ATP production rate were reduced in diabetic animals whereas oxidative ATP production rate, maximal mitochondrial capacity and ATP cost of contraction were not changed. These findings provide in vivo evidence that insulin resistance is not caused by an impairment of mitochondrial function in this diabetic model.
    Mots-clés : crmbm.
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