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Effect Of Feeding And Obesity On Lipoprotein Lipase Activity, Immunoreactive Protein, And Messenger RNA Levels In Human Adipose Tissue.

J. Ong, P. Kern
Published 1989 · Biology, Medicine

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Previous studies have demonstrated higher levels of adipose tissue lipoprotein lipase (LPL) catalytic activity in obese subjects, and in response to a meal. To examine the cellular mechanism of this increase in activity, LPL activity, immunoreactive mass, and mRNA level were measured in lean and obese subjects both before and 4 h after a carbohydrate-rich meal. Heparin-releasable (HR) LPL activity was approximately 2.5-fold higher in the 15 obese subjects, when compared with six lean subjects. However, there was no difference in LPL immunoreactive mass between the lean and obese subjects. In response to the meal, there was a 2.2-fold increase in total adipose tissue LPL activity in the lean subjects due to an increase in both the HR fraction, as well as the adipose fraction extracted with detergents. However, no increase in LPL immunoreactive mass was observed in any adipose tissue LPL fraction, resulting in an increase in LPL specific activity in response to the meal. In the obese subjects, there was no significant increase in LPL activity in response to feeding, and also no increase in immunoreactive mass or specific activity. After extraction of RNA, there was no difference in either the relative proportion of the 3.6- and 3.4-kb human LPL mRNA transcripts, nor in the quantity of LPL mRNA in response to feeding. Thus, these data suggest that the increase in LPL activity under these conditions occurs through a posttranslational activation of a previously inactive LPL precursor.
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