Abstract:
OBJECTIVE:This study was performed to ascertain whether insulin resistance with respect to protein metabolism is an additional primary metabolic abnormality affecting insulin-resistant offspring of type 2 diabetic parents, along with insulin resistance with respect to glucose and lipid metabolism. RESEARCH DESIGN AND METHODS:We studied 18 young, nonobese offspring of type 2 diabetic parents and 27 healthy matched (by means of dual-energy X-ray absorption) individuals with the bolus plus continuous infusion of [6,6-(2)H(2)]glucose and [1-(13)C]leucine in combination with the insulin clamp (40 mU x m(-2) x min(-1)). RESULTS:Fasting plasma leucine, phenylalanine, alanine, and glutamine concentrations, as well as the glucose and leucine turnover (reciprocal pool model: 155 +/- 10 vs. 165 +/- 5 micromol x kg lean body mass(-1) x h(-1) in offspring of type 2 diabetic patients and healthy matched individuals, respectively), were also not different. During the clamp, glucose turnover rates were significantly reduced in offspring of type 2 diabetic patients (7.1 +/- 0.5) in comparison with healthy matched individuals (9.9 +/- 0.6 mg x kg lean body mass(-1) x min(-1); P < 0.01). Also, the suppression of leucine turnover was impaired in offspring of type 2 diabetic patients (12 +/- 1%) in comparison with healthy matched individuals (17 +/- 1%; P = 0.04) and correlated with the degree of the impairment of insulin-stimulated glucose metabolism (R(2) = 0.13; P = 0.02). CONCLUSIONS:Nonobese, nondiabetic, insulin-resistant offspring of type 2 diabetic patients were characterized by an impairment of insulin-dependent suppression of protein breakdown, which was proportional to the impairment of glucose metabolism. These results demonstrate that in humans, a primary in vivo impairment of insulin action affects glucose and fatty acid metabolism as previously shown and also protein/amino acid metabolism.
journal_name
Diabetes Carejournal_title
Diabetes careauthors
Lattuada G,Sereni LP,Ruggieri D,Scollo A,Benedini S,Ragogna F,Costantino F,Battezzati A,Luzi L,Perseghin Gdoi
10.2337/diacare.27.11.2716subject
Has Abstractpub_date
2004-11-01 00:00:00pages
2716-22issue
11eissn
0149-5992issn
1935-5548pii
27/11/2716journal_volume
27pub_type
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