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重新审视富含甘油三酯的脂蛋白的代谢:新的参与者,新的见解。

The metabolism of triglyceride-rich lipoproteins revisited: new players, new insight.

机构信息

Department of Experimental Vascular Medicine, Academic Medical Center, Amsterdam, The Netherlands.

出版信息

Atherosclerosis. 2010 Jul;211(1):1-8. doi: 10.1016/j.atherosclerosis.2009.12.027. Epub 2009 Dec 29.

Abstract

Peripheral lipoprotein lipase (LPL)-mediated lipolysis of triglycerides is the first step in chylomicron/VLDL clearance involving heparan sulfate proteoglycans (HSPGs) displayed at the cell surface of the capillaries in adipose tissue, heart and skeletal muscle. The newly generated chylomicron remnant particles are then cleared by the liver, whereas VLDL remnant particles are either further modified, through the action of hepatic lipase (HL) and cholesteryl ester transfer protein (CETP), into LDL particles or alternatively directly cleared by the liver. Two proteins, lipase maturation factor 1 (LMF1) and glycosylphosphatidylinositol-anchored high density lipoprotein binding protein 1 (GPIHBP1), have been recently identified and have revised our current understanding of LPL maturation and LPL-mediated lipolysis. Moreover, new insights have been gained with respect to hepatic remnant clearance using genetically modified mice targeting the sulfation of HSPGs and even deletion of the most abundant heparan sulfate proteoglycan: syndecan1. In this review, we will provide an overview of novel data on both peripheral TG hydrolysis and hepatic remnant clearance that will improve our knowledge of plasma triglyceride metabolism.

摘要

外周脂蛋白脂肪酶(LPL)介导的甘油三酯水解是乳糜微粒/VLDL 清除的第一步,涉及到肝素硫酸蛋白聚糖(HSPGs)在脂肪组织、心脏和骨骼肌毛细血管表面的表达。新生成的乳糜微粒残粒随后被肝脏清除,而 VLDL 残粒则通过肝脂肪酶(HL)和胆固醇酯转移蛋白(CETP)的作用进一步修饰为 LDL 颗粒,或者直接被肝脏清除。最近已经鉴定出两种蛋白质,即脂肪酶成熟因子 1(LMF1)和糖基磷脂酰肌醇锚定高密度脂蛋白结合蛋白 1(GPIHBP1),它们修订了我们目前对 LPL 成熟和 LPL 介导的脂肪分解的理解。此外,利用针对 HSPGs 硫酸化的基因修饰小鼠和甚至删除最丰富的肝素硫酸蛋白聚糖:syndecan1,在肝残清除方面获得了新的见解。在这篇综述中,我们将提供外周 TG 水解和肝残清除的新数据的概述,这些数据将提高我们对血浆甘油三酯代谢的认识。

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