JNK inhibition by SP600125 attenuates trans-10, cis-12 conjugated linoleic acid-mediated regulation of inflammatory and lipogenic gene expression.

JNK inhibition by SP600125 attenuates trans-10, cis-12 conjugated linoleic acid-mediated regulation of inflammatory and lipogenic gene expression.
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DOI:
10.1007/s11745-011-3587-4
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发表时间:
2011-10
期刊:
影响因子:
1.9
通讯作者:
McIntosh, Michael K.
McIntosh, Michael K.
中科院分区:
医学4区
文献类型:
--
作者:
Martinez, Kristina;Kennedy, Arion;McIntosh, Michael K.

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补充共轭亚油酸 (CLA) 的反式 10、顺式 12 (t10,c12) 和顺式 9、反式 11 (c9,t11) 异构体的混合物或单独补充 t10,c12 CLA,可减少动物和某些人类的体重和脂肪沉积。然而,t10、c12 CLA 的这些抗肥胖作用通常伴随着炎症和胰岛素抵抗标志物的增加。因此,我们检查了使用 JNK 抑制剂 SP600125 阻断 c-Jun NH2 末端激酶 (JNK) 信号传导可在多大程度上减弱经 t10,c12 CLA 处理的原代人类脂肪细胞中的炎症和胰岛素抵抗标志物。 SP600125 减弱 t10,c12 CLA 介导的 cJun 磷酸化,并增加激活转录因子 (ATF) 3(JNK 的两个下游靶标)的蛋白水平。 SP600125 减弱 t10,c12 CLA 介导的炎症基因诱导,包括白细胞介素 (IL)-6、IL-8、IL-1β、ATF3、单核细胞趋化蛋白 (MCP)-1 和环氧合酶-2。与这些数据一致,SP600125 阻止 t10,c12 CLA 介导的 IL-8、IL-6 和 MCP-1 分泌。 SP600125 阻止 t10,c12 CLA 对脂肪生成基因的抑制,包括过氧化物酶体增殖物激活受体 γ、肝脏 × 受体、甾醇调节元件结合蛋白、乙酰辅酶 A 羧化酶和硬脂酰辅酶 A 去饱和酶。此外,SP600125 还可阻断 t10,c12 CLA 介导的细胞因子合成抑制因子 3 的诱导以及脂联素和胰岛素依赖性葡萄糖转运蛋白 4 mRNA 水平的抑制。总的来说,这些数据表明 JNK 信号传导在人类脂肪细胞原代培养物中 t10,c12 CLA 介导的炎症和脂肪生成基因表达的调节中发挥重要作用。
Supplementation with a mixture of trans-10, cis-12 (t10,c12) and cis-9, trans-11 (c9,t11) isomers of conjugated linoleic acid (CLA), or t10,c12 CLA alone, reduces body weight and fat deposition in animals and some humans. However, these anti-obesity actions of t10,c12 CLA are routinely accompanied by increased markers of inflammation and insulin resistance. Thus, we examined the extent to which blocking c-Jun NH2-terminal kinase (JNK) signaling using the JNK inhibitor SP600125 attenuated markers of inflammation and insulin resistance in primary human adipocytes treated with t10,c12 CLA. SP600125 attenuated t10,c12 CLA-mediated phosphorylation of cJun and increased protein levels of activating transcription factor (ATF) 3, two downstream targets of JNK. SP600125 attenuated t10,c12 CLA-mediated induction of inflammatory genes, including interleukin (IL)-6, IL-8, IL-1β, ATF3, monocyte chemoattractant protein (MCP)-1, and cyclooxygenase-2. Consistent with these data, SP600125 prevented t10,c12 CLA-mediated secretion of IL-8, IL-6, and MCP-1. SP600125 prevented t10,c12 CLA suppression of lipogenic genes including peroxisome proliferator activated receptor gamma, liver × receptor, sterol regulatory element binding protein, acetyl-CoA carboxylase, and stearoyl-CoA desaturase. Additionally, SP600125 blocked t10,c12 CLA-mediated induction of suppresser of cytokine synthesis-3 and suppression of adiponectin and insulin-dependent glucose transporter 4 mRNA levels. Collectively, these data suggest that JNK signaling plays an important role in t10,c12 CLA-mediated regulation of inflammatory and lipogenic gene expression in primary cultures of human adipocytes.
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