Weight reduction increases adipose tissue lipoprotein lipase responsiveness in obese women.
Lipoprotein lipase was measured in gluteal adipose tissue from nine obese (90.6 +/- 2.7 kg) women fasting and after the intravenous infusion of insulin and glucose before, immediately after, and 3 mo subsequent to a 14.0 +/- 1.8% (mean +/- SEM) weight reduction. Fasting adipose tissue lipoprotein lipase activity (ATLPL) decreased from 5.3 to 2.3 nEq FFA/10(6) cells per min (P less than 0.02) immediately after weight reduction, yet after weight maintenance, higher levels were again found (6.1 nEq FFA/10(6) cells per min). Although responsiveness of ATLPL to 40 mU/m2 per min of insulin infusion over 6 h was absent before weight loss, increases were seen immediately after weight loss (delta 0.8, P = 0.05) and more so (delta 7.7, P less than 0.01) after 3 mo. Moreover, whereas before weight loss the ATLPL response to ingested mixed meals (delta 0.9) was minimal, in the maintained reduced-obese state a marked increase was seen (delta 12.6, P = 0.02). Thus, because ATLPL is important to lipid filling in adipose tissue, the maintenance of high levels of fasting ATLPL and the increase in enzyme responsiveness in the reduced-obese state could play an important role in the resumption of the obese state, which so commonly follows weight reduction.
Eckel
R H
RH
Department of Medicine, University of Colorado Health Sciences Center, Denver 80262.
Yost
T J
TJ
D000273:Adipose Tissue / Q000201:enzymology*; D000328:Adult; D001835:Body Weight; D004038:Diet, Reducing; D005230:Fatty Acids, Nonesterified / Q000378:metabolism; D005260:Female; D006801:Humans; D007328:Insulin / Q000494:pharmacology; D008071:Lipoprotein Lipase / Q000378:metabolism*; D009765:Obesity / Q000201:enzymology*
D005230:Fatty Acids, Nonesterified; D007328:Insulin; D008071:Lipoprotein Lipase