Cholesterol diet enhances daily rhythm of Pai-1 mRNA in the mouse liver

American Journal of Physiology. Endocrinology and Metabolism
Takashi KudoShigenobu Shibata

Abstract

Myocardial infarction frequently occurs in the morning, a phenomenon in part resulting from the downregulation of fibrinolytic activity. Plasminogen activator inhibitor-1 (PAI-1) is a key factor behind fibrinolytic activity, and its gene expression is controlled under the circadian clock gene in the mouse heart and liver. Hypercholesterolemia has been associated with impaired fibrinolysis due to enhanced PAI-1 activity, which has also been implicated in atherosclerosis. The aim of this study was to decipher whether the Pai-1 gene is still expressed daily with hypercholesterolemia. Hypercholesterolemia (1% cholesterol diet) did not significantly affect the daily expression of clock genes (Per2 and Bmal1) and clock-controlled genes (Dbp and E4bp4) in the liver (P > 0.05); however, daily expression of the Pai-1 gene and Pai-1 promoter regulating factor genes such as Nr4a1 was significantly upregulated (P < 0.01). Daily restricted feeding for 4 h during the day reset the gene expression of Per2, Pai-1, Nr4a1, and Tnf-alpha. Lesion of the suprachiasmatic nucleus, the location of the main clock system, led to loss of Per2 and Pai-1 daily expression profiles. In the present experiments, we demonstrated that hypercholesterolemia enhanc...Continue Reading

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Jul 8, 2009·Critical Care : the Official Journal of the Critical Care Forum·Li-Fu LiShuen-Kuei Liao
Apr 25, 2007·Frontiers in Neuroendocrinology·Oren Froy
Dec 18, 2013·Biochemical and Biophysical Research Communications·Yinghua GaoRuizhe Qian
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Dec 18, 2020·Frontiers in Pharmacology·Chenyang ZhangXiaobo Sun

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