Perfluoroalkanoate (PFAS) modulation of the inflammatory response through potent inhibition of arachidonic acid metabolizing cyclooxygenase and cytochrome P450 enzymes

全氟链烷酸酯 (PFAS) 通过有效抑制花生四烯酸代谢环加氧酶和细胞色素 P450 酶来调节炎症反应

• 批准号: 10373848
• 负责人: Jed Noah Lampe
• 金额: $ 18.85万
• 依托单位: UNIVERSITY OF COLORADO DENVER
• 依托单位国家: 美国
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-12-01 至 2023-11-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/10373848
• 关键词: Achievement; Alkane 1-monooxygenase; Anabolism; Arachidonic Acids; Biological Assay; Cells; Chemicals; Chronic Disease; Cytochrome P450; Data; Defect; Development; Disease; Environment; Environmental Pollution; Enzyme Inhibition; Enzymes; Exposure to; Fatty Acids; Fostering; Foundations; Future; Generations; Goals; Health; Hepatic; Hepatocyte; Hepatotoxicity; Homeostasis; Human; Hyperlipidemia; IL8 gene; Immune; Immune System Diseases; Immune response; Immune system; Immunity; Immunologics; Immunosuppression; Impairment; In Vitro; Individual; Inflammation Mediators; Inflammatory; Inflammatory Response; Innate Immune System; LOX gene; Lipids; Lipopolysaccharides; Liver; Malignant Neoplasms; Mediator of activation protein; Metabolic; Metabolic Pathway; Metabolism; Molecular; National Institute of Environmental Health Sciences; National Toxicology Program; PTGS1 gene; Pathway interactions; Poly-fluoroalkyl substances; Populations at Risk; Positioning Attribute; Production; Prostaglandin-Endoperoxide Synthase; Public Health; Regulation; Research; Resolution; Rodent; Role; Scheme; Signal Transduction; Testing; Time; Tissues; Toxic effect; Toxicology; United States National Institutes of Health; Vaccines; Work; cancer risk; cohort; cytokine; falls; immunopathology; immunoregulation; immunotoxicity; improved; inflammatory modulation; inhibitor; insight; lipidomics; novel; prevent; response

PROJECT SUMMARY The ubiquitous environmental contaminants collectively known as PFAS (Per- and polyfluoroalkyl substances) have been dubbed “forever chemicals” due to their persistence in the environment. In humans, they have been associated with a wide variety of illnesses, including: cancer, immunotoxicities, hepatotoxicity hyperlipidemias, and developmental defects. Despite their toxicological threat to human health, the exact molecular mechanisms by which they exert their effects have remained elusive. A common theme existing between many of these disease states is the disruption of immune system homeostasis, which manifests itself in an increased risk for cancer and other immunotoxicities. Our long-term goal is to delineate the molecular mechanisms related to PFAS-induced innate immune system dysfunction in the liver. The objective of this particular application is to characterize how PFAS, through modulation of key metabolic enzymes, may impact the production of oxylipins by hepatocytes. The impact of these findings will provide mechanistic insight into which innate immune cell mediators contribute to immunosuppression by PFAS. Our central hypothesis is that CYP, COX, and LOX inhibition by PFAS leads to dysregulation of oxylipin synthesis, promoting immune suppression. We will test this hypothesis through employing two specific aims. In our first aim, we will identify the CYP, COX, and LOX oxylipin metabolic pathways inhibited by the PFAS compounds via direct enzyme inhibition assays and a targeted lipidomics approach. This aim will define the impacts of PFAS on the generation of liver-derived inflammatory mediators in exposed individuals. In our second aim, we will characterize the inflammatory response to LPS in PFAS-exposed primary hepatocytes. Here, we will characterize oxylipin metabolism and cytokine production in response to PFAS and LPS exposure to delineate how hepatocytes respond to inflammatory signals after PFAS exposure, thus providing insight into the potential health effects during an immunological challenge. To date, the potential effects of PFAS on hepatic immune responses is not well understood. This proposal will further delineate the molecular mechanisms of PFAS on oxylipin production and immunological challenge, providing a strong foundation for understanding the role of PFAS in immune system dysregulation, which is key to developing treatments for those who have been exposed and preventing the observed immunopathology.

项目总结 无处不在的环境污染物，统称为全氟烷基(全氟烷基和多氟烷基 物质)因其在环境中的持久性而被称为“永远的化学品”。在人类身上， 它们与多种疾病有关，包括：癌症、免疫毒性、肝毒性。 高脂血症和发育缺陷。尽管它们对人类健康构成毒理威胁，但确切的 它们发挥作用的分子机制仍然难以捉摸。存在一个共同的主题 在这些疾病状态之间是免疫系统动态平衡的破坏，这本身就是表现。 增加患癌症和其他免疫毒性的风险。我们的长期目标是描绘出分子 PFAS诱导肝脏先天免疫系统功能障碍的机制。这样做的目的是 具体的应用是表征全氟辛烷磺酸如何通过调节关键的代谢酶来影响 肝细胞产生氧磷脂。这些发现的影响将提供对 哪些先天免疫细胞介体参与了PFAS的免疫抑制。我们的中心假设是 PFAS抑制CYP、COX和LOX导致氧脂合成失调，促进免疫 压制。我们将通过两个具体的目标来检验这一假设。在我们的第一个目标中，我们将确定 PFAS化合物通过直接酶抑制CYP、COX和LOX氧脂代谢途径 抑制试验和靶向脂质组学方法。这一目标将确定全氟化碳协定对 暴露人群中肝源性炎症介质的产生。在我们的第二个目标中，我们将 研究PFAS暴露的原代肝细胞对内毒素的炎症反应。在这里，我们将 表征氧脂代谢和细胞因子的产生对PFAS和脂多糖暴露的反应 肝细胞如何对PFAS暴露后的炎症信号做出反应，从而提供了对潜在的 在免疫学挑战期间对健康的影响。到目前为止，PFAS对肝脏免疫的潜在影响 人们对此的反应并不是很清楚。这一建议将进一步阐明全氟辛烷磺酸的分子机制。 氧磷脂的产生和免疫学挑战，为理解其作用提供了坚实的基础 PFAS在免疫系统失调中的作用，这是开发治疗那些已经 暴露和预防观察到的免疫病理。