Elucidating the role of Fra1 in pancreatic Kras-driven acinar to ductal metaplasia

阐明 Fra1 在胰腺 Kras 驱动的腺泡到导管化生中的作用

• 批准号: 10631947
• 负责人: Alina Lin Li
• 金额: $ 4.87万
• 依托单位: COLUMBIA UNIVERSITY HEALTH SCIENCES
• 依托单位国家: 美国
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-07-01 至 2026-06-30
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/10631947
• 关键词: 3-Dimensional; ATAC-seq; Academic Medical Centers; Acinar Cell; Acute; Advisory Committees; Affect; Agreement; Alleles; Amino Acid Motifs; Attenuated; Automobile Driving; Award; Back; Basic Science; Binding Sites; Biological Assay; CSF3 gene; Caerulein; Cell Culture Techniques; Cell Nucleus; Cells; Characteristics; Cholecystokinin; Chromatin; Chromatin Modeling; Colony-Stimulating Factor Receptors; Data Analyses; Development; Doctor of Philosophy; Dose; Doxycycline; Duct (organ) structure; Ductal Epithelial Cell; Epithelial Cells; Epithelium; FOSL1 gene; Fellowship; Fibroblasts; Fos-Related Antigens; Foundations; Functional disorder; Goals; Homeostasis; Individual; Inflammation; Injury; KRAS oncogenesis; KRAS2 gene; Knockout Mice; Knowledge; Lesion; Link; Maintenance; Mediator; Medical center; Mentors; Metaplasia; Modeling; Molecular and Cellular Biology; Mutation; Oncogenic; Outcome; Pancreas; Pancreatic Ductal Adenocarcinoma; Pancreatic Injury; Pancreatic Intraepithelial Neoplasia; Pancreatitis; Persons; Phenotype; Physicians; Population; Precipitation; Process; Public Health; Regulation; Research Personnel; Residencies; Resources; Role; Scientist; Signal Pathway; Signal Transduction; Techniques; Testing; Therapeutic Intervention; Tissues; Training; Translational Research; Universities; Up-Regulation; acute pancreatitis; analog; career; cell dedifferentiation; cell type; chromatin remodeling; chronic pancreatitis; combat; effective therapy; experience; innovation; insight; mouse model; mutant; new therapeutic target; novel; pancreatic metaplasia; pre-doctoral; progenitor; protein complex; response to injury; single cell sequencing; therapeutic target; three dimensional cell culture; tissue regeneration; transcription factor

PROJECT SUMMARY (ABSTRACT) Acute and chronic pancreatitis afflict millions of individuals in the US. Mouse models have revealed that acinar cells can de-differentiate after pancreatic injury to a progenitor-like cell type with ductal characteristics in a process termed acinar-to-ductal metaplasia (ADM). In the absence of oncogenic mutations, ADM lesions can resolve and reform the acinar compartment. However, in the presence of oncogenic Kras mutations, the ADM lesions can continue to de-differentiate to a pre-invasive pancreatic intraepithelial neoplasia (PanIN). The mechanisms that drive PanIN formation in the context of injury and oncogenic mutations are poorly understood, resulting in an absence of targets to combat the persistent ADM. We have identified previously through bulk ATAC-sequencing that the transcription factor Fra1 is differentially active only in the context of mutant Kras and acute inflammation. We have also generated a unique mouse model expressing inducible mutant KRAS (iKras) and Fra1 loxp alleles (Fra1 KO) in a pancreatic epithelial- specific manner. Our preliminary studies demonstrate that Fra1 loss attenuates ADM formation and stromagenesis compared to the FRA1 WT controls. The overarching goal of this proposal is to understand how FRA1 and its interacting partners, which constitute the AP-1 complex, govern ADM progression in the context of mutant Kras and inflammation. My hypothesis is that FRA1 is a central mediator of ADM. I will investigate the cell autonomous and non-cell autonomous effects driving FRA1 activation through the following interrelated Specific Aims: (1) Investigate how Fra1 remodels chromatin in ADM after induction of pancreatitis; (2) Elucidate the role of fibroblast-secreted G-CSF in Fra1 induction during pancreatitis. I will use novel mouse models, ex vivo 3D acinar and ADM cell cultures, and state-of-the-art single-cell sequencing and chromatin precipitation assays to conduct this study. This proposal also encompasses a translational aspect by proposing G-CSFR as a novel therapeutic target for the treatment of acute pancreatitis. Additionally, this project incorporates aspects of pathophysiology, molecular/cellular biology, and quantitative data analysis. This proposal provides me with a robust foundation in both experimental and quantitative analysis and broadens my fundamental knowledge of pancreatic epithelial cell homeostasis and plasticity. With the guidance from experienced mentors (Drs. Rustgi and Sims), my advisory committee and the rich array of resources at Columbia University Irving Medical Center, I will be able to complete my predoctoral PhD training. Completion of this critical milestone will set the stage for my long-term goal as a physician-scientist who conducts basic and translational research in an academic medical center with a focus on tissue inflammation, cellular identity and plasticity, and tissue regeneration.

项目摘要（摘要） 在美国，急性和慢性胰腺炎遭受了数百万个人。鼠标模型显示腺泡 胰腺损伤后，细胞可以脱离分化，以在A中具有导管特征的祖细胞样细胞类型 过程称为腺泡到导管化的化生（ADM）。在没有致癌突变的情况下，ADM病变可以 解决并改革腺泡室。但是，在存在致癌KRAS突变的情况下 病变可以继续向侵入性胰腺上皮内肿瘤（Panin）脱离分化。这 在损伤和致癌突变的背景下驱动Panin形成的机制知之甚少， 导致没有目标来应对持续的ADM。 我们先前通过大量ATAC序列确定了转录因子FRA1是差异的 仅在突变KRAS和急性炎症的情况下活跃。我们还产生了独特的鼠标 在胰腺上皮中表达诱导突变体KRAS（IKRAS）和FRA1 LOXP等位基因（FRA1 KO）的模型 具体方式。我们的初步研究表明，FRA1损失减弱了ADM的形成和 与FRA1 WT对照相比，间曲性症。该提议的总体目标是了解如何 构成AP-1综合体的FRA1及其相互作用的伙伴在以下背景下控制ADM的进展 突变的KRAS和炎症。我的假设是FRA1是ADM的中心调解人。我会调查 细胞自主和非细胞自主效应通过以下 相互关联的特定目的：（1）研究FRA1在诱导后如何重塑ADM的染色质 胰腺炎; （2）阐明成纤维细胞分泌的G-CSF在胰腺炎期间的FRA1诱导中的作用。我 将使用新型的鼠标模型，Ex Vivo 3D腺泡和ADM细胞培养物以及最新的单细胞测序 和染色质沉淀测定法以进行这项研究。该建议还包括一个翻译方面 通过提出G-CSFR作为治疗急性胰腺炎的新型治疗靶标。另外，这个 项目结合了病理生理学，分子/细胞生物学和定量数据分析方面。这 提案为我提供了实验和定量分析的强大基础，并扩大了我 胰腺上皮细胞稳态和可塑性的基本知识。 在经验丰富的导师（Rustgi和Sims博士）的指导下，我的咨询委员会和富有的阵列 哥伦比亚大学欧文医学中心的资源，我将能够完成我的博士前博士培训。 完成这个关键里程碑的完成将为我作为医师科学家的长期目标奠定舞台 学术医学中心的基础和转化研究，重点是组织炎症，细胞 身份和可塑性以及组织再生。