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Journal of Lipid Research, Vol 35, 1535-1541, Copyright © 1994 by Lipid Research, Inc.
ARTICLES |
BG Slavin, JM Ong and PA Kern
Department of Anatomy and Cell Biology, School of Medicine, University of Southern California, Los Angeles 90033.
Hormone-sensitive lipase (HSL) mediates the lipolysis of triacylglycerol from mammalian adipocytes, resulting in the release of non-esterified fatty acids and glycerol. Although numerous studies have examined the hormonal regulation of HSL, the measurement of HSL mRNA levels in response to hormonal regulators has not been studied. This study was designed to determine the effects of epinephrine, growth hormone, glucagon, and dexamethasone on HSL expression by measuring HSL mRNA levels and glycerol release in primary cultures of rat adipocytes. Exposure of adipocytes to epinephrine at 10(-7) M and 10(-5) M for 4 h resulted in an increase in medium glycerol (209 +/- 46%, and 284 +/- 58% of control, P < 0.001, respectively). However, no change in HSL mRNA levels occurred due to the epinephrine treatment. Similarly, the peptides glucagon (10(-7) M and 10(-5) M for 4 h) and growth hormone (100 ng/ml for 24 h) resulted in increased medium glycerol and had no effect on HSL mRNA levels in adipocytes. Dexamethasone was added to adipocyte cultures for 4 and 24 h, and resulted in a dose-dependent increase of medium glycerol (102 +/- 8%, 138 +/- 8% (P < 0.001), and 168 +/- 24% (P < 0.001) for 10(-8) M, 10(-7) M, and 10(-6) M, respectively).(ABSTRACT TRUNCATED AT 250 WORDS)
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