Overlapping roles of the glucose-responsive genes, S14 and S14R, in hepatic lipogenesis

Derrick L. Aipoalani, Brennon L. O'Callaghan, Douglas G. Mashek, Cary N. Mariash, Howard C. Towle

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The Spot 14 (S14; Thrsp) gene has been implicated in supporting regulated lipogenesis in mammals. S14 gene expression in liver is controlled by a wide variety of hormones and dietary factors in parallel with the major lipogenic enzyme genes. In addition, mice deleted for the S14 gene display reduced de novo lipogenesis in the lactating mammary gland. However, no decrease in hepatic lipogenesis was observed in the S14 null mouse. It was postulated that this difference could be due to the expression of a paralogous gene called S14R (S14 related; Mig12) in the liver but not mammary tissue. To test this hypothesis, we used small interfering RNA to simultaneously reduce levels of S14 and S14R in cultured primary hepatocytes. We found that rates of lipogenesis were decreased by approximately 65% in cells treated with insulin and high glucose. This reduction was associated with a decrease in total liver triacylglycerolsandanalteredmorphologyof lipid droplets. Expression of either S14 or S14R gene products was sufficient to fully restore normal lipogenesis. No change in the hepatic expression of other major lipogenic enzyme genes occurred during manipulation of S14 and/or S14R levels. These data support the hypothesis that both S14 and S14R are directly involved in supporting hepatic lipogenesis and that the two proteins play overlapping roles in this process.

Original languageEnglish (US)
Pages (from-to)2071-2077
Number of pages7
JournalEndocrinology
Volume151
Issue number5
DOIs
StatePublished - May 1 2010

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Lipogenesis
Glucose
Liver
Genes
Enzymes
Human Mammary Glands
Small Interfering RNA
Mammals
Hepatocytes
Breast
Hormones
Insulin
Gene Expression
Proteins

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Overlapping roles of the glucose-responsive genes, S14 and S14R, in hepatic lipogenesis. / Aipoalani, Derrick L.; O'Callaghan, Brennon L.; Mashek, Douglas G.; Mariash, Cary N.; Towle, Howard C.

In: Endocrinology, Vol. 151, No. 5, 01.05.2010, p. 2071-2077.

Research output: Contribution to journalArticle

Aipoalani, Derrick L. ; O'Callaghan, Brennon L. ; Mashek, Douglas G. ; Mariash, Cary N. ; Towle, Howard C. / Overlapping roles of the glucose-responsive genes, S14 and S14R, in hepatic lipogenesis. In: Endocrinology. 2010 ; Vol. 151, No. 5. pp. 2071-2077.
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