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Division of Endocrinology, Department of Medicine, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas 72205
Adipose tissue expresses
tumor necrosis factor (TNF) and interleukin (IL)-6, which may cause
obesity-related insulin resistance. We measured TNF and IL-6 expression
in the adipose tissue of 50 lean and obese subjects without diabetes.
Insulin sensitivity (SI) was determined by an intravenous
glucose tolerance test with minimal-model analysis. When lean [body
mass index (BMI) <25 kg/m2] and obese (BMI 30-40
kg/m2) subjects were compared, there was a 7.5-fold
increase in TNF secretion (P < 0.05) from adipose tissue,
and the TNF secretion was inversely related to SI
(r =
0.42, P < 0.02). IL-6 was
abundantly expressed by adipose tissue. In contrast to TNF, plasma
(rather than adipose) IL-6 demonstrated the strongest relationship with obesity and insulin resistance. Plasma IL-6 was significantly higher in
obese subjects and demonstrated a highly significant inverse
relationship with SI (r =
0.71,
P < 0.001). To separate the effects of BMI from
SI, subjects who were discordant for SI were
matched for BMI, age, and gender. By use of this approach, subjects
with low SI demonstrated a 3.0-fold increased level of TNF
secretion from adipose tissue and a 2.3-fold higher plasma IL-6 level
(P < 0.05) compared with matched subjects with a high SI. Plasma IL-6 was significantly associated with plasma
nonesterified fatty acid levels (r = 0.49, P < 0.002). Thus the local expression of TNF and
plasma IL-6 are higher in subjects with obesity-related insulin resistance.
type 2 diabetes
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