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Diabetes, Vol 49, Issue 5 749-758, Copyright © 2000 by American Diabetes Association
Hepatic fat content and insulin action on free fatty acids and glucose metabolism rather than insulin absorption are associated with insulin requirements during insulin therapy in type 2 diabetic patients
L Ryysy, AM Hakkinen, T Goto, S Vehkavaara, J Westerbacka, J Halavaara and H Yki-Jarvinen
Department of Medicine, University of Helsinki, Finland.
To determine causes of interindividual variation in insulin requirements,
we recruited 20 type 2 diabetic patients with stable glucose control and
insulin doses for >1 year on combination therapy with bedtime NPH
insulin and metformin. Insulin absorption (increase in free and total
insulin over 8 h after a subcutaneous dose of regular insulin) and actions
of intravenous (6-h 0.3 mU x kg(-1) x min(-1) euglycemic insulin clamp
combined with [3-3H]glucose) and subcutaneous (glucose infusion rate
required to maintain isoglycemia and suppression of free fatty acids
[FFAs]) insulin, liver fat content (proton spectroscopy), visceral fat
(magnetic resonance imaging), weight, and body composition were determined.
We found the following variation in parameters: insulin dose range 10-176 U
(mean 42 U, fold variation 17.6x) or 0.13-1.39 U/kg (0.44 U/kg, 10.7x),
absorbed insulin 10.6x, action of subcutaneous insulin to suppress FFAs 7.5
x and to stimulate glucose metabolism (M value) 11.5x, body weight 67-127
kg (91 kg, 1.9x), liver fat 2-28% (12%, 14x), and visceral fat 179-2,053 ml
(1,114 ml, 11.5x). The amount of insulin absorbed, measured as either free
or total insulin, was significantly correlated with its ability to suppress
FFAs and stimulate glucose metabolism but not with the insulin dose per se.
The actions of absorbed insulin were, on the other hand, significantly
correlated with the daily insulin dose (r = 0.70 for action on FFAs, P <
0.001, and r = -0.61 for M value, P < 0.005). Actions of subcutaneous
and intravenous insulin to suppress FFAs were significantly correlated (r =
0.82, P < 0.001, R2 = 67%). Of the measures of adiposity, the percent
hepatic fat was the parameter best correlated with the daily insulin dose
(r = 0.76, P < 0.001). The percent hepatic fat was also significantly
correlated with the ability of intravenous insulin to suppress endogenous
glucose production (r = 0.72, P < 0.005). We conclude that the major
reason for interindividual variation in insulin requirements in type 2
diabetes is the variation in insulin action. Variation in hepatic fat
content may influence insulin requirements via an effect on the sensitivity
of endogenous glucose production to insulin.

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A. Seppala-Lindroos, S. Vehkavaara, A.-M. Hakkinen, T. Goto, J. Westerbacka, A. Sovijarvi, J. Halavaara, and H. Yki-Jarvinen
Fat Accumulation in the Liver Is Associated with Defects in Insulin Suppression of Glucose Production and Serum Free Fatty Acids Independent of Obesity in Normal Men
J. Clin. Endocrinol. Metab.,
July 1, 2002;
87(7):
3023 - 3028.
[Abstract]
[Full Text]
[PDF]
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D. E. Kelley, G. A. Bray, F. X. Pi-Sunyer, S. Klein, J. Hill, J. Miles, and P. Hollander
Clinical Efficacy of Orlistat Therapy in Overweight and Obese Patients With Insulin-Treated Type 2 Diabetes: A 1-year randomized controlled trial
Diabetes Care,
June 1, 2002;
25(6):
1033 - 1041.
[Abstract]
[Full Text]
[PDF]
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