Weight loss in massive obesity: reciprocal changes in plasma HDL cholesterol and HDL binding to human adipocyte plasma membranes.
Human obesity is frequently associated with elevated plasma triglyceride and cholesterol concentrations and reduced high density lipoprotein (HDL) cholesterol, abnormalities that commonly revert to normal levels with weight loss. This study was undertaken to examine possible mechanism(s) associated with the changes in plasma HDL cholesterol concentrations in massively obese patients after weight loss. Ten massively obese patients (two men and eight women, age = 37.8 +/- 2.4 years) were studied before, during, and after 1 year of weight loss and weight maintenance following gastric stapling. Total cholesterol and low density lipoprotein cholesterol were within the normal range for sex and age before weight loss and did not change significantly during or after weight reduction. In the females, HDL cholesterol concentrations increased from 0.96 +/- 0.06 mmol/L to 1.23 +/- 0.3 mmol/L (mean +/- SEM, n = 8, P less than .05) with weight reduction. In the two men, plasma HDL cholesterol concentrations were, respectively, 1.22 and 0.65 mmol/L before and 1.23 and 0.98 mmol/L after weight loss. Specific binding of 125I-HDL2 and 125I-HDL3 to purified plasma membranes was determined using abdominal and omental fat depot before and after weight loss in six of the ten obese patients. An average reduction of 30% to 40% in 125I-HDL2 and 125I-HDL3 binding capacity to these membranes occurred after weight loss. Furthermore, a positive correlation (r = .65, n = 10, P less than .05) was observed between plasma HDL cholesterol and triglyceride concentrations before weight loss but not after weight loss (r = .01).(ABSTRACT TRUNCATED AT 250 WORDS)
Jimenez
J G
JG
Institute of Medical Science, University of Toronto, Ontario.
Fong
B S
BS
Julien
P
P
Despres
J P
JP
Angel
A
A
D000273:Adipose Tissue / Q000378:metabolism*; D000328:Adult; D001835:Body Weight; D002462:Cell Membrane / Q000378:metabolism; D008076:Cholesterol, HDL / Q000097:blood*; D005260:Female; D006801:Humans; D008075:Lipoproteins, HDL / Q000378:metabolism*; D053439:Lipoproteins, HDL2; D053440:Lipoproteins, HDL3; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000097:blood* / Q000601:surgery
D008076:Cholesterol, HDL; D008075:Lipoproteins, HDL; D053439:Lipoproteins, HDL2; D053440:Lipoproteins, HDL3