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Diabetes, Vol 38, Issue 12 1512-1527, Copyright © 1989 by American Diabetes Association
Lilly lecture 1989. Toward physiological understanding of glucose tolerance. Minimal-model approach
RN Bergman
Department of Physiology and Biophysics, University of Southern California Medical School, Los Angeles 90033.
Glucose tolerance depends on a complex interaction among insulin secretion
from the beta-cells, clearance of the hormone, and the actions of insulin
to accelerate glucose disappearance and inhibit endogenous glucose
production. An additional factor, less well recognized, is the ability of
glucose per se, independent of changes in insulin, to increase glucose
uptake and suppress endogenous output (glucose effectiveness). These
factors can be measured in the intact organism with physiologically based
minimal models of glucose utilization and insulin kinetics. With the
glucose minimal model, insulin sensitivity (SI) and glucose effectiveness
(SG) are measured by computer analysis of the frequently sampled
intravenous glucose tolerance test. The test involves intravenous injection
of glucose followed by tolbutamide or insulin and frequent blood sampling.
SI varied from a high of 7.6 x 10(-4) min-1.microU-1.ml-1 in young Whites
to 2.3 x 10(-4) min-1.microU-1.ml-1 in obese nondiabetic subjects; in all
of the nondiabetic subjects, SG was normal. In subjects with
non-insulin-dependent diabetes mellitus (NIDDM), not only was SI reduced
90% below normal (0.61 +/- 0.16 x 10(-4) min-1.microU-1.ml-1), but in this
group alone, SG was reduced (from 0.026 +/- 0.008 to 0.014 +/- 0.002
min-1); thus, defects in SI and SG are synergistic in causing glucose
intolerance in NIDDM. One assumption of the minimal model is that the time
delay in insulin action on glucose utilization in vivo is due to sluggish
insulin transport across the capillary endothelium. This was tested by
comparing insulin concentrations in plasma with those in lymph
(representing interstitial fluid) during euglycemic-hyperinsulinemic
glucose clamps. Lymph insulin was lower than plasma insulin at basal (12
vs. 18 microU/ml) and at steady state, indicating significant loss of
insulin from the interstitial space, presumably due to cellular uptake of
the insulin-receptor complex. Additionally, during clamps, lymph insulin
changed more slowly than plasma insulin, but the rate of glucose
utilization followed a time course identical with that of lymph (r = .96)
rather than plasma (r = .71). Thus, lymph insulin, which may be reflective
of interstitial fluid, is the signal to which insulin-sensitive tissues are
responding. These studies support the concept that, at physiological
insulin levels, the time for insulin to cross the capillary endothelium is
the process that determines the rate of insulin action in vivo.(ABSTRACT
TRUNCATED AT 400 WORDS)

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June 1, 2004;
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1369 - 1374.
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T. A. Lakka, T. Rankinen, S. J. Weisnagel, Y. C. Chagnon, H.-M. Lakka, O. Ukkola, N. Boule, T. Rice, A. S. Leon, J. S. Skinner, et al.
Leptin and Leptin Receptor Gene Polymorphisms and Changes in Glucose Homeostasis in Response to Regular Exercise in Nondiabetic Individuals: The HERITAGE Family Study
Diabetes,
June 1, 2004;
53(6):
1603 - 1608.
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[Full Text]
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