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饮食诱导的肝脂肪变性通过诱导 PCSK9 表达在小鼠中消除细胞表面 LDLR。

Diet-induced hepatic steatosis abrogates cell-surface LDLR by inducing PCSK9 expression in mice.

机构信息

From the Department of Medicine, McMaster University, The Research Institute of St. Joe's Hamilton, Hamilton, Ontario L8N 4A6 and.

the Laboratory of Biochemical Neuroendocrinology, Montreal Clinical Research Institute, University of Montreal, Montreal, Quebec H2W 1R7, Canada.

出版信息

J Biol Chem. 2019 Jun 7;294(23):9037-9047. doi: 10.1074/jbc.RA119.008094. Epub 2019 Apr 19.


DOI:10.1074/jbc.RA119.008094
PMID:31004037
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6556582/
Abstract

The worldwide prevalence of non-alcoholic fatty liver disease (NAFLD) is increasing rapidly. Although this condition is generally benign, accumulating evidence now suggests that patients with NAFLD are also at increased risk of cardiovascular disease (CVD); the leading cause of death in developed nations. Despite the well-established role of the liver as a central regulator of circulating low-density lipoprotein (LDL) cholesterol levels, a known driver of CVD, the mechanism(s) by which hepatic steatosis contributes to CVD remains elusive. Interestingly, a recent study has shown that circulating proprotein convertase subtilisin/kexin type 9 (PCSK9) levels correlate positively with liver steatosis grade. Given that PCSK9 degrades the LDL receptor (LDLR) and prevents the removal of LDL from the blood into the liver, in the present study we examined the effect of hepatic steatosis on LDLR expression and circulating LDL cholesterol levels. We now report that in a manner consistent with findings in patients, diet-induced steatosis increases circulating PCSK9 levels as a result of expression in mice. We also report the finding that steatosis abrogates hepatic LDLR expression and increases circulating LDL levels in a PCSK9-dependent manner. These findings provide important mechanistic insights as to how hepatic steatosis modulates lipid regulatory genes, including and the , and also highlights a novel mechanism by which liver disease may contribute to CVD.

摘要

全球范围内非酒精性脂肪性肝病 (NAFLD) 的患病率正在迅速上升。尽管这种情况通常是良性的,但越来越多的证据表明,NAFLD 患者患心血管疾病 (CVD) 的风险也增加;CVD 是发达国家的主要死亡原因。尽管肝脏作为循环低密度脂蛋白 (LDL) 胆固醇水平的中枢调节剂的作用已得到充分确立,而 LDL 胆固醇是 CVD 的已知驱动因素,但肝脂肪变性导致 CVD 的机制仍不清楚。有趣的是,最近的一项研究表明,循环前蛋白转化酶枯草溶菌素/柯萨奇蛋白酶 9 (PCSK9) 水平与肝脂肪变性程度呈正相关。鉴于 PCSK9 降解 LDL 受体 (LDLR) 并阻止 LDL 从血液中清除到肝脏中,在本研究中,我们检查了肝脂肪变性对 LDLR 表达和循环 LDL 胆固醇水平的影响。我们现在报告说,与患者中的发现一致,饮食诱导的脂肪变性会导致小鼠中 PCSK9 的表达增加,从而导致循环 PCSK9 水平升高。我们还报告了这样一个发现,即脂肪变性以 PCSK9 依赖的方式破坏肝脏 LDLR 表达并增加循环 LDL 水平。这些发现为肝脂肪变性如何调节脂质调节基因(包括 LDLR 和 PCSK9)提供了重要的机制见解,并强调了肝脏疾病可能导致 CVD 的一种新机制。

相似文献

[1]
Diet-induced hepatic steatosis abrogates cell-surface LDLR by inducing PCSK9 expression in mice.

J Biol Chem. 2019-4-19

[2]
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[3]
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[4]
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[5]
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J Biol Chem. 2012-5-16

[6]
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J Nutr Biochem. 2015-11

[7]
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[8]
Ascorbic acid enhances low-density lipoprotein receptor expression by suppressing proprotein convertase subtilisin/kexin 9 expression.

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[9]
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[10]
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引用本文的文献

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Noncoding RNA Res. 2025-4-28

[2]
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J Clin Endocrinol Metab. 2025-3-3

[3]
PCSK9-antibodies fail to block PCSK9-induced inflammation in macrophages and cannot recapitulate protective effects of PCSK9-deficiency in experimental myocardial infarction.

Front Cardiovasc Med. 2025-1-21

[4]
New epigenome players in the regulation of PCSK9-H3K4me3 and H3K9ac alterations by statin in hypercholesterolemia.

J Lipid Res. 2025-1

[5]
Normal caloric intake with high-fat diet induces metabolic dysfunction-associated steatotic liver disease and dyslipidemia without obesity in rats.

Sci Rep. 2024-10-1

[6]
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J Biol Chem. 2024-11

[7]
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Signal Transduct Target Ther. 2024-1-8

[8]
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Geroscience. 2024-2

[9]
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Curr Med Sci. 2023-12

[10]
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本文引用的文献

[1]
Chlorogenic acid against palmitic acid in endoplasmic reticulum stress-mediated apoptosis resulting in protective effect of primary rat hepatocytes.

Lipids Health Dis. 2018-11-28

[2]
Effect of low carbohydrate high fat diet on LDL cholesterol and gene expression in normal-weight, young adults: A randomized controlled study.

Atherosclerosis. 2018-10-17

[3]
Circulating PCSK9 levels are not associated with the severity of hepatic steatosis and NASH in a high-risk population.

Atherosclerosis. 2018-9-13

[4]
The cargo receptor SURF4 promotes the efficient cellular secretion of PCSK9.

Elife. 2018-9-25

[5]
Naringin Activates AMPK Resulting in Altered Expression of SREBPs, PCSK9, and LDLR To Reduce Body Weight in Obese C57BL/6J Mice.

J Agric Food Chem. 2018-8-20

[6]
The effect of high fat diet and metformin treatment on liver lipids accumulation and their impact on insulin action.

Sci Rep. 2018-5-8

[7]
Posttranslational modification of proprotein convertase subtilisin/kexin type 9 is differentially regulated in response to distinct cardiometabolic treatments as revealed by targeted proteomics.

J Clin Lipidol. 2018-4-3

[8]
Loss-of-function PCSK9 mutants evade the unfolded protein response sensor GRP78 and fail to induce endoplasmic reticulum stress when retained.

J Biol Chem. 2018-3-28

[9]
PCSK9 induces a pro-inflammatory response in macrophages.

Sci Rep. 2018-2-2

[10]
Palmitic Acid: Physiological Role, Metabolism and Nutritional Implications.

Front Physiol. 2017-11-8

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