LPS binding to TLR4 regulates hepatic stellate cell activation and fibrosis
LPS 与 TLR4 结合调节肝星状细胞活化和纤维化
基本信息
- 批准号:8223187
- 负责人:
- 金额:$ 33.67万
- 依托单位:
- 依托单位国家:美国
- 项目类别:
- 财政年份:2011
- 资助国家:美国
- 起止时间:2011-02-15 至 2016-01-31
- 项目状态:已结题
- 来源:
- 关键词:ActivinsAdaptor Signaling ProteinAddressAffectAgonistAlcohol abuseAlcoholic Liver CirrhosisAntisense OligonucleotidesAutoimmune DiseasesBindingBlood CirculationBone MarrowBone Morphogenetic ProteinsCCL2 geneCCR1 geneCCR5 geneCX3CL1 geneCellsChemotaxisChronicCirrhosisClinicalComplexDepositionDown-RegulationEndotoxinsExtracellular MatrixExtracellular Matrix ProteinsFibrosisFractalkineGenesGenetic TranscriptionGoalsHealthcareHeavy DrinkingHepaticHepatic Stellate CellHepatitis BHepatitis CHepatocyteInfectionInflammationInflammatoryInflammatory ResponseInjuryIntestinesKupffer CellsLinkLipopolysaccharidesLiverLiver FailureLiver FibrosisMAP3K7 geneMAPK8 geneMacrophage Inflammatory Protein-1Malignant NeoplasmsMediatingMembraneMolecularMorbidity - disease rateMusMutatePathway interactionsPatientsPattern recognition receptorPhosphotransferasesPlayPopulationPortal HypertensionPrevention strategyPrevention therapyPrimary carcinoma of the liver cellsProductionPromoter RegionsProtein BiosynthesisRANTESRecruitment ActivityRegulationRepressionResistanceRoleSignal TransductionStagingSymptomsSystemTestingTranscription Factor AP-1Viral hepatitisbasecare burdenchemokinechemokine receptorcytokinedesigngene inductiongut microflorainhibitor/antagonistliver transplantationmacrophagemigrationmortalitynonalcoholic steatohepatitisnovel therapeutic interventionoverexpressionpromoterpublic health relevancereceptorresponsetoll-like receptor 4transcription factor
项目摘要
DESCRIPTION (provided by applicant): Liver fibrosis caused by excessive alcohol consumption, viral hepatitis, autoimmune diseases, and non- alcoholic steatohepatitis (NASH), can progress to cirrhosis, liver failure, portal hypertension, and hepatocellular carcinoma. Hepatic fibrosis is characterized by the excessive deposition of extracellular matrix, mainly produced by activated hepatic stellate cells (HSCs), and is highly associated with chronic liver inflammation. However, the precise link between inflammation and hepatic fibrosis is still unknown. Thus, understanding the molecular mechanisms of hepatic fibrosis may help to design strategies for the prevention and treatment of liver injury and fibrosis. Patients with cirrhosis show increased systemic levels of endotoxin (lipopolysaccharide, LPS). We have previously shown that Toll-like receptor 4 (TLR4), a pattern recognition receptor for LPS, plays a critical role in hepatic fibrosis. Gut microflora-derived LPS entering into the portal circulation directly activates HSCs through TLR4, but not Kupffer cells. Activation of the LPS/TLR4 pathway enhances signaling by TGF-2, the most potent fibrogenic agonist, by downregulating bone morphogenetic protein and Activin membrane bound inhibitor (Bambi), a transmembrane suppressor of TGF-2 signaling. Based on our findings, we propose to further characterize the role of TLR4 in the activation of HSCs and in hepatic fibrosis. We hypothesize that gut intestinal microflora-derived LPS binds to the TLR4 receptor in HSCs. Activated TLR4 signaling results in the formation and the release of an intracellular signaling complex. The resulting intracellular signaling activates genes including chemokines and leads to hepatic inflammation and hepatic fibrosis. The TGF-2 signaling modulator Bambi is regulated by TLR4 signaling at the promoter level in HSCs. Based on these hypotheses, we will determine the distinct roles of MyD88 and TRIF between HSCs and Kupffer cells, and TLR4-dependent receptor-associated signaling complex in HSCs (Aim 1). We will determine the regulation of Bambi at the signaling and promoter levels by LPS in HSCs (Aim 2). Moreover, we will address the role of TLR4-induced chemokines in hepatic fibrosis (Aim 3). The pursuit of these three aims will elucidate the crucial role of TLR4 signaling in HSC activation and hepatic fibrosis. The long-term goal of this project is to provide a novel therapeutic approach targeting TLR4 signaling in the prevention and therapy of liver fibrosis.
PUBLIC HEALTH RELEVANCE: Hepatic fibrosis and its end stage, cirrhosis, represent a massive health care burden worldwide. The goal of this study is to investigate whether lipopolysaccharide and its receptor TLR4 affect hepatic fibrosis through TLR4 intracellular signaling, TGF-2 signaling, and chemokine/receptor systems. The results from this study might establish TLR4 and its related functions as targets for the therapy of hepatic fibrosis.
描述(由申请人提供):由过度饮酒、病毒性肝炎、自身免疫性疾病和非酒精性脂肪性肝炎(NASH)引起的肝纤维化可进展为肝硬化、肝衰竭、门静脉高压和肝细胞癌。肝纤维化的特征是细胞外基质过度沉积,主要由活化的肝星状细胞(HSC)产生,并且与慢性肝脏炎症高度相关。然而,炎症和肝纤维化之间的确切联系仍然是未知的。因此,了解肝纤维化的分子机制可能有助于设计预防和治疗肝损伤和纤维化的策略。肝硬化患者显示内毒素(脂多糖,LPS)的全身水平增加。我们以前已经表明,Toll样受体4(TLR 4),LPS的模式识别受体,在肝纤维化中起着关键作用。肠道菌群来源的LPS进入门静脉循环直接激活HSC通过TLR 4,但不是库普弗细胞。LPS/TLR 4通路的激活通过下调骨形态发生蛋白和激活素膜结合抑制剂(Bambi)(TGF-2信号传导的跨膜抑制剂)增强TGF-2(最有效的纤维化激动剂)的信号传导。基于我们的研究结果,我们建议进一步表征TLR 4在HSC活化和肝纤维化中的作用。我们推测肠道菌群来源的LPS与HSC中的TLR 4受体结合。活化的TLR 4信号传导导致细胞内信号传导复合物的形成和释放。由此产生的细胞内信号激活包括趋化因子在内的基因,并导致肝脏炎症和肝纤维化。TGF-2信号调节剂Bambi在HSC中受TLR 4信号在启动子水平的调节。基于这些假设,我们将确定MyD 88和TRIF在HSC和Kupffer细胞之间的不同作用,以及HSC中TLR 4依赖性受体相关信号传导复合物(Aim 1)。我们将在HSC中确定LPS在信号和启动子水平对Bambi的调节(目的2)。此外,我们将讨论TLR 4诱导的趋化因子在肝纤维化中的作用(目的3)。对这三个目标的追求将阐明TLR 4信号在HSC活化和肝纤维化中的关键作用。本项目的长期目标是提供一种新的治疗方法,靶向TLR 4信号转导在预防和治疗肝纤维化。
公共卫生相关性:肝纤维化及其终末期肝硬化是全球范围内巨大的卫生保健负担。本研究的目的是探讨脂多糖及其受体TLR 4是否通过TLR 4细胞内信号、TGF-2信号和趋化因子/受体系统影响肝纤维化。本研究结果可能为TLR 4及其相关功能作为肝纤维化治疗的靶点奠定基础。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
数据更新时间:{{ journalArticles.updateTime }}
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
数据更新时间:{{ journalArticles.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ monograph.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ sciAawards.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ conferencePapers.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ patent.updateTime }}
EKIHIRO SEKI其他文献
EKIHIRO SEKI的其他文献
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
{{ truncateString('EKIHIRO SEKI', 18)}}的其他基金
A human Liver-on-a-Chip model for studying alcohol-associated liver disease
用于研究酒精相关肝病的人类芯片肝脏模型
- 批准号:
10752839 - 财政年份:2023
- 资助金额:
$ 33.67万 - 项目类别:
Project 2 - Fatty Liver Predisposes to Metastasis: Role of Hepatic Stellate Cells
项目 2 - 脂肪肝易于转移:肝星状细胞的作用
- 批准号:
10558481 - 财政年份:2020
- 资助金额:
$ 33.67万 - 项目类别:
Project 2 - Fatty Liver Predisposes to Metastasis: Role of Hepatic Stellate Cells
项目 2 - 脂肪肝易于转移:肝星状细胞的作用
- 批准号:
10331758 - 财政年份:2020
- 资助金额:
$ 33.67万 - 项目类别:
Role of TLR7 in progression and treatment of alcoholic hepatitis
TLR7在酒精性肝炎进展和治疗中的作用
- 批准号:
10190743 - 财政年份:2018
- 资助金额:
$ 33.67万 - 项目类别:
Role of TLR7 in progression and treatment of alcoholic hepatitis
TLR7在酒精性肝炎进展和治疗中的作用
- 批准号:
10442533 - 财政年份:2018
- 资助金额:
$ 33.67万 - 项目类别:
Alcohol enhances colon cancer liver metastasis via cancer-associated fibroblasts
酒精通过癌症相关成纤维细胞增强结肠癌肝转移
- 批准号:
9331372 - 财政年份:2017
- 资助金额:
$ 33.67万 - 项目类别:
Synergistic Actions By Multiple Toll-Like Receptors in Alcoholic Liver Disease
多个 Toll 样受体在酒精性肝病中的协同作用
- 批准号:
9025358 - 财政年份:2015
- 资助金额:
$ 33.67万 - 项目类别:
Extracellular Matrix Regulates Hepatic Stellate Cell Activation and Fibrosis
细胞外基质调节肝星状细胞活化和纤维化
- 批准号:
9753207 - 财政年份:2011
- 资助金额:
$ 33.67万 - 项目类别:
LPS binding to TLR4 regulates hepatic stellate cell activation and fibrosis
LPS 与 TLR4 结合调节肝星状细胞活化和纤维化
- 批准号:
8039827 - 财政年份:2011
- 资助金额:
$ 33.67万 - 项目类别:
LPS binding to TLR4 regulates hepatic stellate cell activation and fibrosis
LPS 与 TLR4 结合调节肝星状细胞活化和纤维化
- 批准号:
8606459 - 财政年份:2011
- 资助金额:
$ 33.67万 - 项目类别: