Homeostasis of cholesterol is regulated by absorption in the intestine and synthesis in the liver. The authors previously demonstrated that OPN (osteopontin) exhibits the ability to alter hepatic cholesterol metabolism, thus affecting cholesterol gallstone formation in mice. The present study investigated the role of OPN in cholesterol gallstone formation, focusing on its effect on intestinal absorption of cholesterol. OPN gene knockout (OPN‑/‑) mice and wild‑type mice were respectively fed with a chow or lithogenic diet (LD) for 8 weeks. Following an 8‑week LD period, the incidence of gallstone, bile composition, level of serum and fecal lipids and the expression of intestinal associated genes were analyzed. OPN‑/‑ mice were protected from gallstone formation induced by 8 weeks' LD‑feeding. This protective effect from OPN deficiency was associated with alterations in bile composition, including a reduced concentration of biliary cholesterol. Additionally, plasma cholesterol level was decreased in LD‑fed OPN‑/‑ mice. The alterations primarily resulted from the decreased expression of intestinal Niemann‑Pick C1‑like (NPC1 L) 1, which is important in the intestinal absorption of cholesterol. The present study demonstrated that OPN deficiency reduced intestinal absorption of cholesterol by suppressing the expression of NPC1L1, thus protecting mice from cholesterol gallstone formation.

译文

胆固醇的稳态受肠道吸收和肝脏合成的调节。作者先前证明OPN (骨桥蛋白) 表现出改变肝胆固醇代谢的能力,从而影响小鼠胆固醇胆结石的形成。本研究调查了OPN在胆固醇结石形成中的作用,重点是其对胆固醇肠道吸收的影响。OPN基因敲除 (OPN ‑/‑) 小鼠和野生型小鼠分别饲喂chow或成石饮食 (LD) 8周。在为期8周的LD期后,分析了胆结石的发生率,胆汁成分,血清和粪便脂质水平以及肠道相关基因的表达。Opn-/-小鼠免受8周的ld-feeding诱导的胆结石形成的影响。OPN缺乏症的这种保护作用与胆汁成分的改变有关,包括降低胆汁胆固醇的浓度。此外,ld-fed opn-/-小鼠的血浆胆固醇水平降低。这些改变主要是由于肠neemann-pick C1样 (NPC1 L) 1的表达降低,这在胆固醇的肠道吸收中很重要。本研究表明,OPN缺乏通过抑制NPC1L1的表达来减少肠道对胆固醇的吸收,从而保护小鼠免受胆固醇结石的形成。

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