Mitochondrial function assessed by 31 P MRS and BOLD MRI in non‐obese type 2 diabetic rats

The study aims to characterize age‐associated changes in skeletal muscle bioenergetics by evaluating the response to ischemia‐reperfusion in the skeletal muscle of the Goto‐Kakizaki ( GK ) rats, a rat model of non‐obese type 2 diabetes (T2D). 31 P magnetic resonance spectroscopy ( MRS ) and blood ox...

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Veröffentlicht in:Physiological reports 2016-08, Vol.4 (15)
Hauptverfasser: Liu, Yuchi, Mei, Xunbai, Li, Jielei, Lai, Nicola, Yu, Xin
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Yu, Xin
description The study aims to characterize age‐associated changes in skeletal muscle bioenergetics by evaluating the response to ischemia‐reperfusion in the skeletal muscle of the Goto‐Kakizaki ( GK ) rats, a rat model of non‐obese type 2 diabetes (T2D). 31 P magnetic resonance spectroscopy ( MRS ) and blood oxygen level‐dependent ( BOLD ) MRI was performed on the hindlimb of young (12 weeks) and adult (20 weeks) GK and Wistar (control) rats. 31 P‐ MRS and BOLD ‐ MRI data were acquired continuously during an ischemia and reperfusion protocol to quantify changes in phosphate metabolites and muscle oxygenation. The time constant of phosphocreatine recovery, an index of mitochondrial oxidative capacity, was not statistically different between GK rats (60.8 ± 13.9 sec in young group, 83.7 ± 13.0 sec in adult group) and their age‐matched controls (62.4 ± 11.6 sec in young group, 77.5 ± 7.1 sec in adult group). During ischemia, baseline‐normalized BOLD ‐ MRI signal was significantly lower in GK rats than in their age‐matched controls. These results suggest that insulin resistance leads to alterations in tissue metabolism without impaired mitochondrial oxidative capacity in GK rats.
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The time constant of phosphocreatine recovery, an index of mitochondrial oxidative capacity, was not statistically different between GK rats (60.8 ± 13.9 sec in young group, 83.7 ± 13.0 sec in adult group) and their age‐matched controls (62.4 ± 11.6 sec in young group, 77.5 ± 7.1 sec in adult group). During ischemia, baseline‐normalized BOLD ‐ MRI signal was significantly lower in GK rats than in their age‐matched controls. 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subjects Bioenergetics
Body temperature
Diabetes
Diabetes mellitus
Diabetes mellitus (non-insulin dependent)
Experiments
Functional magnetic resonance imaging
Glucose
Insulin
Insulin resistance
Ischemia
Laboratories
Magnetic resonance spectroscopy
Metabolism
Metabolites
Mitochondria
Musculoskeletal system
NMR
Nuclear magnetic resonance
Obesity
Oxidative metabolism
Phosphocreatine
Reperfusion
Skeletal muscle
Spectrum analysis
Studies
title Mitochondrial function assessed by 31 P MRS and BOLD MRI in non‐obese type 2 diabetic rats
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