Lactucopicrin抑制炎症巨噬细胞中胞浆动力蛋白介导的NF-kB活化并减轻载脂蛋白E缺乏小鼠的动脉粥样硬化症状

“Lactucopicrin Inhibits Cytoplasmic Dynein-Mediated NF-kB Activation in Inflammated Macrophages and Alleviates Atherogenesis in Apolipoprotein E-Deficient Mice”

Key words: Lactucopicrin;Dynein;NF-kB activation; Inflammated macrophages;Atherogenesis

文章简介

①发表期刊:2021年1月22日发表于《Molecular Nutrition & Food Research》,JCR分区:Q1,IF=5.309

②原文链接:He L, Weng H, Li Q, Shi G, Liu X, Du Y, Zheng J, Ling W, Wang D. Lactucopicrin Inhibits Cytoplasmic Dynein-Mediated NF-κB Activation in Inflammated Macrophages and Alleviates Atherogenesis in Apolipoprotein E-Deficient Mice. Mol Nutr Food Res. 2021 Feb;65(4):e2000989. doi: 10.1002/mnfr.202000989. Epub 2021 Jan 22. PMID: 33377310.

研究背景

动脉粥样硬化(AS)性心血管疾病作为全球人口死亡的重大疾病之一,其发病常与营养膳食不均密切相关。因此,人们通过摄入可降低AS发病风险的含非营养素成分的果蔬来防控AS的发生、发展。

有研究证实,巨噬细胞炎症是AS发病的重要因素,且受NF-kB(p50、p65亚基)异二聚体调控。在休眠期的巨噬细胞中,胞浆中的NF-kB与其抑制剂IkBα结合,但当巨噬细胞遭受促炎因子刺激时,IkB激酶(IKK)被激活,进而使IkBα磷酸化,导致IkBα发生泛素化及蛋白酶体降解;NF-kB被释放后,NF-kB核定位序列暴露,由胞浆动力蛋白Dynein将NF-kB以负极运动方向运输至胞质蛋白importin-5上,importin-5护送NF-kB从胞质向核内转移,启动多个基因的转录,例如促炎因子IL-1β、TNF-α的表达,那么,抑制巨噬细胞中NF-kB激活可能是治疗AS的潜在途径。倍半萜类化合物山莴苣苦素(Lactucopicrin,LCP)作为一种分布于菊科蔬菜生菜、菊科药用植物菊苣中的苦味物质,具抗疟、抗癌、镇痛镇静等药理活性,但其对AS的影响未见报道。故中山大学公共卫生院王冬亮教授团队基于RAW264.7巨噬细胞模型和ApoE基因敲除小鼠模型探讨LCP对AS的影响及功能机制。

科学问题

LCP是否具有抗动脉粥样硬化作用?其发挥功能的分子机制是怎样的?

技术路线

To evaluate the impact of lactucopicrin on macrophage inflammation and theformation of early atherosclerosis.


Results

①Lactucopicrin Reduces NF-BActivities in Inflammated Macrophages.

②Lactucopicrin does not Modulate the Upstream Components of the Canonical NF-B Pathway and NF-B/p65 DNA Binding Activity in Inflammated Macrophages.

Lactucopicr inInhibits p65 Nuclear Translocation in Inflammated Macrophages.

Lactucopicr inInhibits p65 Nuclear Translocation by Down regulation of Cytoplasmic Dynein-Mediated Transport of p65 in Inflammated Macrophages.

Lactucopicr inInhibits Early Atherosclerosis Formation in ApoE–/–Mice.

⑥Lactucopicrin Reduces NF-B Activities in Macrophages within Atherosclerotic Plaques in ApoE–/–Mice.

三人行必有我师焉

小知识汇总啦!!!

1)NF-kB同源/异源二聚体,由两类亚基组成,分别是:①p65(Rel A)、RelB、c-Rel;②p50、p52,常见组成:p65/p50,p65/p65;

2)BMDMs分离于8周龄C57BL/6J小鼠;

3)DTT:二硫苏糖醇,是巯基化DNA的还原剂和去保护剂,可降低DNA的二聚化,裂解蛋白质分子间的二硫键,在本研究中作为一种蛋白烷基化抑制剂;

4)In Vitro Toxicity Assay Kit (Sigma–Aldrich):检测细胞培养上清;

5)Luciferase Reporter Assay:pNF-B luciferase reporter vectors 和 internal

control of Renilla-luciferase reporter vectors构建,经细胞转染试剂Lipofectamine 2000 reagent (Invitrogen, Carlsbad, CA)转染至BMDMs,24h后,细胞裂解,由Dual-Luciferase Reporter Assay kit (Promega)检测NF-B活性;

6)whole-cell, cytoplasmic, or nuclear lysates were

isolated using a Nuclear and Cytoplasmic Protein Extraction kit (Thermo Fisher Scientific);

7)-Actin常作为胞质蛋白内参,histone H3 作为核蛋白的内参;

8)RT-qPCR试剂盒三件套:①RNA提取(RNeasy Kits(Qiagen, Hilden, Germany);②反转录(SuperScript III kit (Invitrogen) using random primers);③荧光探针标记(iQ SYBR Green Supermix (Bio-Rad, Hercules, CA);注:常以gapdh基因作内参;

9)炎症因子ELISA试剂盒:IL-1 (MHSLB00), TNF- (MTA00B), IL-6 (M6000B) quantitative ELISA kits

(R&D Systems, Minneapolis, MN);

10)DNA-Binding Activity of Nuclear p65:TransAM

NF-B p65 ELISA kit (Active Motif, Carlsbad, CA);

11)抗体订购:CD68(rat, 14–0681-82, Invitrogen),F4/80(rabbit, ab100790, Abcam),NF-B/p65(rabbit, ab16502, Abcam), orIL-1 (rabbit, ab9722, Abcam),AlexaFluor 647 anti-rat IgG (Invitrogen) orAlexa Fluor 488 anti-rabbit IgG(Invitrogen)

12)血清总胆固醇及甘油三酯检测:commercial enzyme kits (Applygen, Beijing, China)。

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