| A Novel Mechanism for Decreasing Plasma Lipid Level from Imidazoline I-1 Receptor Activation in High Fat Diet-fed Mice. | |
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MedLine Citation:
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PMID: 21484668 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The imidazoline I-1 receptor (I-1 R) agonists are widely used to lower blood pressure, but their effects on hyperlipidemia are still obscure. The present study is aimed to evaluate the possible mechanism(s) of I-1 R in the regulation of lipid homeostasis. Farnesoid X receptor (FXR) plays an important role in blood lipid homeostasis; however, the role of FXR in rilmenidine-induced blood lipid lowering action is still unknown. Thus, we administered rilmenidine, a selective agonist of I-1 R, into high fat diet-fed (HFD) mice showing hypertriglyceridemia and hypercholesterolemia. Rilmenidine significantly ameliorated hyperlipidemia in HFD mice after 7 days of administration. Pretreatment with efaroxan, at a dose sufficient to inhibit I-1 R activation, blocked the effects of rilmenidine. Also, in cultured HepG2 cells, rilmenidine dose-dependently induced the expression of farnesoid X receptor (FXR). The rilmenidine-induced FXR expression and FXR-related genes were blocked by efaroxan. However, rilmenidine treatment did not affect the expression of enzymes related to β-oxidation. In conclusion, activation of I-1 R may activate FXR to lower plasma lipids, suggesting I-1 R as a new target for the treatment of hyperlipidemia. |
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Authors:
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C-S Niu; H-T Wu; K-C Cheng; K-C Lin; C-T Chen; J-T Cheng |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-4-11 |
Journal Detail:
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Title: Hormone and metabolic research = Hormon- und Stoffwechselforschung = Hormones et metabolisme Volume: - ISSN: 1439-4286 ISO Abbreviation: - Publication Date: 2011 Apr |
Date Detail:
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Created Date: 2011-4-12 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0177722 Medline TA: Horm Metab Res Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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© Georg Thieme Verlag KG Stuttgart · New York. |
Affiliation:
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Department of Nursing, Tzu Chi College of Technology, Hualien City, Taiwan. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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