Stimulation of in vitro triglyceride synthesis in the rat hepatocyte by growth hormone treatment in vivo

Marshall Elam, Carl P. Simkevich, Solomon S. Solomon, Henry G. Wilcox, Murray Heimberg

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Hepatic fatty acid metabolism in the rat is sexually differentiated. Rates of esterification by the liver of fatty acid into triglyceride and other esterification products (phospholipid, diglyceride, cholesteryl esters) are higher in the female than in the male. There is evidence to suggest that GH feminizes other hepatic systems that exhibit sexual dimorphism, including hepatic steroid metabolism, PRL receptors, and estrogen binding. To investigate the role of GH in maintenance of the high rates of fatty acid esterification observed in the female, we assessed rates of [l-14C]oleic acid utilization by hepatocytes prepared from hypophysectomized (hypox) cortisol/T3-replaced female rats with an without continuous in vivo infusion of human (h) GH (5 μg/h). In addition, we assessed the effect of in vivo hGH treatment (5 μg/h) on [l-14C]oleic acid utilization in the normal male rat. Hypophysectomy was accompanied by a reduction in incorporation of [l-14C]oleic acid into products of esterification (triglyceride, phospholipid, diglyceride) and oxidation (CO2, ketone bodies). Continuous infusion of hGH (5 μg/h; 14 days) restored rates of fatty acid esterification in the hypoxcortisol/ T3-replaced female rat, with the exception of cholesteryl. esters. hGH infusion partially restored rates of fatty acid oxidation in the hypox cortisol/T3-replaced female rat. Treatment of the adult male rat with continuous infusion of hGH (5 μg/h; 7 days) resulted in increased rates of incorporation of [1-14C] oleic acid into triglyceride. In contrast, incorporation of oleic acid into phospholipid, diglyceride, and cholesteryl esters was unaltered. These results suggest that GH may be an important regulator of hepatic fatty acid metabolism.

Original languageEnglish (US)
Pages (from-to)1397-1402
Number of pages6
JournalEndocrinology
Volume122
Issue number4
DOIs
StatePublished - Apr 1 1988

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Esterification
Growth Hormone
Oleic Acid
Hepatocytes
Triglycerides
Fatty Acids
Diglycerides
Liver
Phospholipids
Cholesterol Esters
Hydrocortisone
Prolactin Receptors
Ketone Bodies
Hypophysectomy
Sex Characteristics
In Vitro Techniques
Estrogens
Esters
Steroids
olifen

All Science Journal Classification (ASJC) codes

  • Endocrinology

Cite this

Stimulation of in vitro triglyceride synthesis in the rat hepatocyte by growth hormone treatment in vivo. / Elam, Marshall; Simkevich, Carl P.; Solomon, Solomon S.; Wilcox, Henry G.; Heimberg, Murray.

In: Endocrinology, Vol. 122, No. 4, 01.04.1988, p. 1397-1402.

Research output: Contribution to journalArticle

Elam, Marshall ; Simkevich, Carl P. ; Solomon, Solomon S. ; Wilcox, Henry G. ; Heimberg, Murray. / Stimulation of in vitro triglyceride synthesis in the rat hepatocyte by growth hormone treatment in vivo. In: Endocrinology. 1988 ; Vol. 122, No. 4. pp. 1397-1402.
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abstract = "Hepatic fatty acid metabolism in the rat is sexually differentiated. Rates of esterification by the liver of fatty acid into triglyceride and other esterification products (phospholipid, diglyceride, cholesteryl esters) are higher in the female than in the male. There is evidence to suggest that GH feminizes other hepatic systems that exhibit sexual dimorphism, including hepatic steroid metabolism, PRL receptors, and estrogen binding. To investigate the role of GH in maintenance of the high rates of fatty acid esterification observed in the female, we assessed rates of [l-14C]oleic acid utilization by hepatocytes prepared from hypophysectomized (hypox) cortisol/T3-replaced female rats with an without continuous in vivo infusion of human (h) GH (5 μg/h). In addition, we assessed the effect of in vivo hGH treatment (5 μg/h) on [l-14C]oleic acid utilization in the normal male rat. Hypophysectomy was accompanied by a reduction in incorporation of [l-14C]oleic acid into products of esterification (triglyceride, phospholipid, diglyceride) and oxidation (CO2, ketone bodies). Continuous infusion of hGH (5 μg/h; 14 days) restored rates of fatty acid esterification in the hypoxcortisol/ T3-replaced female rat, with the exception of cholesteryl. esters. hGH infusion partially restored rates of fatty acid oxidation in the hypox cortisol/T3-replaced female rat. Treatment of the adult male rat with continuous infusion of hGH (5 μg/h; 7 days) resulted in increased rates of incorporation of [1-14C] oleic acid into triglyceride. In contrast, incorporation of oleic acid into phospholipid, diglyceride, and cholesteryl esters was unaltered. These results suggest that GH may be an important regulator of hepatic fatty acid metabolism.",
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