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Diabetes, Vol 45, Issue 7 984-987, Copyright © 1996 by American Diabetes Association
Adipose tissue leptin production and plasma leptin kinetics in humans
S Klein, SW Coppack, V Mohamed-Ali and M Landt
Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri 63110-1093, USA. sklein@imgate.wustl.edu
Abdominal adipose tissue leptin production was determined in vivo by
arteriovenous balance in 14 lean and obese men (mean BMI 27.0 +/- 1.9,
range 21.4-45.2). Blood samples were taken simultaneously from an abdominal
vein that drains subcutaneous adipose tissue and from a radial artery.
Adipose tissue blood flow was measured by xenon washout. Abdominal vein
leptin concentrations (mean 8.9 +/- 2.4 ng/ml, range 2.1-36.5 ng/ml) were
consistently greater than arterial values (mean 6.6 +/- 1.9 ng/ml, range
1.7-28.2 ng/ml) (P < 0.001). The net rate of abdominal adipose tissue
leptin production (mean 3.2 +/- 0.5 ng x 100 g(-1) x min(-1)) correlated
directly with percentage body fat (rs = 0.59, P = 0.016). Estimated
whole-body leptin production rate (797 +/- 283 ng x person(-1) x min(-1))
correlated directly with percent body fat (rs = 0.93, P < 0.0001) and
with regional leptin production (rs = 0.81, P < 0.001). In contrast, the
rate of leptin clearance from plasma (mean 1.50 +/- 0.23 ml x kg(-1) x
min(-1)) and plasma leptin half-life (mean 24.9 +/- 4.4 min) was unrelated
to adiposity (rs = 0.06, P = 0.30; rs = 0.16, P = 0.30, respectively).
These results provide direct evidence that leptin is produced by adipose
tissue in humans and that the rate of production is directly related to
adiposity. A combination of greater leptin production per unit of body fat
and increased production from expanded total body fat mass, rather than
alterations in leptin clearance, account for the increase in plasma leptin
concentrations observed in obese humans.

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