Journal of Clinical Endocrinology & Metabolism, Vol 80, 936-941, Copyright © 1995 by Endocrine Society

ARTICLES

Growth hormone inhibits lipoprotein lipase activity in human adipose tissue

M Ottosson, K Vikman-Adolfsson, S Enerback, A Elander, P Bjorntorp and S Eden
Wallenberg Laboratory, Department of Heart and Lung Disease, Sahlgrenska University Hospital, Goteborg, Sweden.

The in vitro effects of GH on human adipose tissue lipoprotein lipase (LPL) activity and messenger ribonucleic acid (mRNA) levels were studied using a tissue incubation technique. After preincubation for 3 days, abdominal sc adipose tissue pieces were exposed to cortisol (1000 nmol/L) for 3 days to induce LPL activity. Addition of GH (50 micrograms/L) to the cortisol-containing medium during the last 24 h (day 6) caused a decrease by 84 +/- 4% (P < 0.01) in heparin-releasable LPL activity and by 65 +/- 4% (P < 0.01) in total LPL activity. Moreover, the heparin-releasable fraction was reduced from 42% of the total LPL activity with cortisol alone to 17% when both GH and cortisol were present in the incubation medium during the last 24 h (P < 0.01). The reduction in LPL activity in response to GH was not accompanied by a decrease in the level of LPL mRNA measured by a solution hybridization ribonuclease protection assay. In adipose tissue incubated in the control medium for 6 days, the addition of GH alone during the last 24 h caused an insignificant decrease in heparin- releasable LPL activity. Low control activities limited the scope for further decrease. It is concluded that GH counteracts the potent stimulatory effect of glucocorticoids on LPL activity without affecting LPL mRNA levels. Therefore, the inhibition of LPL activity by GH probably occurs during translation and/or posttranslational processing of the enzyme, and the mechanism may involve a decreased channeling of the lipase to the cell surface.

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