Cytochrome P450 1B1: An unexpected modulator of liver fatty acid homeostasis.

Cytochrome P450 1B1: An unexpected modulator of liver fatty acid homeostasis.
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DOI:
10.1016/j.abb.2015.02.010
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发表时间:
2015-04-01
影响因子:
3.9
通讯作者:
Jefcoate, Colin R.
Jefcoate, Colin R.
中科院分区:
生物学3区
文献类型:
--
作者:
Larsen, Michele Campaigne;Bushkofsky, Justin R.;Gorman, Tyler;Adhami, Vaqar;Mukhtar, Hasan;Wang, Suqing;Reeder, Scott B.;Sheibani, Nader;Jefcoate, Colin R.

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细胞色素 P450 1b1 (Cyp1b1) 在小鼠肝细胞中不表达,但存在于肝内皮细胞和活化的星状细胞中。脂肪生成过程中表达增加表明 Cyp1b1 代谢在脂肪酸稳态中发挥作用。向野生型 C57BL/6j (WT) 和 Cyp1b1-null (Cyp1b1-ko) 小鼠提供低脂肪或高脂肪饮食(分别为 LFD 和 HFD)。 Cyp1b1 缺失抑制了 HFD 引起的肥胖,改善了葡萄糖耐量并预防了肝脏脂肪变性。 Cyp1b1-ko 小鼠的一致特征是肝窦肝细胞中脂滴的抑制,伴随着糖原颗粒的增强。 Cyp1b1 缺失改变了 560 个肝脏基因的体内表达,包括 PPARγ、硬脂酰辅酶 A 去饱和酶 1 (Scd1) 的抑制和 PPARα 刺激的许多基因,每个基因都与能量储存机制的这种转换一致。然而,WY-14643 对 Cyp1b1-ko 小鼠中 PPARα 的配体激活是有效的。 Cyp1b1-ko 小鼠中的 17 个基因变化对应于减轻饮食诱导的糖尿病的小鼠转基因表达。小鼠肝细胞中 Cyp1b1 的缺失表明通过肝细胞外信号传导参与能量稳态。肝脏基因表达中广泛的性别二态性表明 Cyp1b1 对雌激素代谢的发育影响。 Scd1 的抑制和瘦素更新的增加支持增强下丘脑的瘦素参与。 Cyp1b1 介导的对血管细胞的影响可能是这些变化的基础。
Cytochrome P450 1b1 (Cyp1b1) expression is absent in mouse hepatocytes, but present in liver endothelia and activated stellate cells. Increased expression during adipogenesis suggests a role of Cyp1b1 metabolism in fatty acid homeostasis. Wild-type C57BL/6j (WT) and Cyp1b1-null (Cyp1b1-ko) mice were provided low or high fat diets (LFD and HFD, respectively). Cyp1b1-deletion suppressed HFD-induced obesity, improved glucose tolerance and prevented liver steatosis. Suppression of lipid droplets in sinusoidal hepatocytes, concomitant with enhanced glycogen granules, was a consistent feature of Cyp1b1-ko mice. Cyp1b1 deletion altered the in vivo expression of 560 liver genes, including suppression of PPARγ, stearoyl CoA desaturase 1 (Scd1) and many genes stimulated by PPARα, each consistent with this switch in energy storage mechanism. Ligand activation of PPARα in Cyp1b1-ko mice by WY-14643 was, nevertheless, effective. Seventeen gene changes in Cyp1b1-ko mice correspond to mouse transgenic expression that attenuated diet-induced diabetes. The absence of Cyp1b1 in mouse hepatocytes indicates participation in energy homeostasis through extra-hepatocyte signaling. Extensive sexual dimorphism in hepatic gene expression suggests a developmental impact of estrogen metabolism by Cyp1b1. Suppression of Scd1 and increased leptin turnover support enhanced leptin participation from the hypothalamus. Cyp1b1-mediated effects on vascular cells may underlie these changes.
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发表时间: 2012-06-01
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DOI: 10.3727/000000001783992533
发表时间: 2001-01-01
期刊: GENE EXPRESSION-THE JOURNAL OF LIVER RESEARCH
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DOI: 10.1016/s0003-9861(03)00174-7
发表时间: 2003-06-01
影响因子: 3.9
作者:
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