Abstract:
OBJECTIVE:Impaired muscular mitochondrial function is related to common insulin resistance in type 2 diabetes. Mitochondrial diseases frequently lead to diabetes, which is mostly attributed to defective beta-cell mitochondria and secretion. RESEARCH DESIGN AND METHODS:We assessed muscular mitochondrial function and lipid deposition in liver (hepatocellular lipids [HCLs]) and muscle (intramyocellular lipids [IMCLs]) using (31)P/(1)H magnetic resonance spectroscopy and insulin sensitivity and endogenous glucose production (EGP) using hyperinsulinemic-euglycemic clamps combined with isotopic tracer dilution in one female patient suffering from MELAS (myopathy, encephalopathy, lactic acidosis, and stroke-like episodes) syndrome and in six control subjects. RESULTS:The MELAS patient showed impaired insulin sensitivity (4.3 vs. 8.6 +/- 0.5 mg x kg(-1) x min(-1)) and suppression of EGP (69 vs. 94 +/- 1%), and her baseline and insulin-stimulated ATP synthesis were reduced (7.3 and 8.9 vs. 10.6 +/- 1.0 and 12.8 +/- 1.3 micromol x l(-1) x min(-1)) compared with those of the control subjects. HCLs and IMCLs were comparable between the MELAS patient and control subjects. CONCLUSIONS:Impairment of muscle mitochondrial fitness promotes insulin resistance and could thereby contribute to the development of diabetes in some patients with the MELAS syndrome.
journal_name
Diabetes Carejournal_title
Diabetes careauthors
Szendroedi J,Schmid AI,Meyerspeer M,Cervin C,Kacerovsky M,Smekal G,Gräser-Lang S,Groop L,Roden Mdoi
10.2337/dc08-2078subject
Has Abstractpub_date
2009-04-01 00:00:00pages
677-9issue
4eissn
0149-5992issn
1935-5548pii
dc08-2078journal_volume
32pub_type
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