The Role of Renal Interstitium in Kidney Development

项目摘要/摘要 肾脏沿着皮质到髓质轴与肾单位的特定节段形成图案， 集合管和血管系统在组织学上都是相邻的。为了让一个 肾脏要发挥功能，来自不同细胞谱系的不同细胞类型必须形成在相同的解剖结构上 地点。尽管已经有一些关于个体血统是如何变得模式化的见解(例如 近端远端肾单位图案)，不同的细胞类型/谱系如何协调它们的发育 导致器官全局图案化的原因尚不清楚。 我们最近发现肾间质细胞表现出广泛的异质性和图案化。 沿着新生小鼠肾脏的皮质/髓质轴[1]。肾间质的花纹结构域 精确地映射到肾脏内的不同解剖区域。不同类型的间质细胞如何 它们的产生及其在肾脏发育/功能中的作用尚不清楚。我们假设 间质起着传递和整合来自不同血统的信号的作用，进而，再信息源 并沿皮质/髓质轴整合肾实质的分化。vbl.使用 通过对单细胞RNA-Seq数据的生物信息学分析，我们已经确定了该基因的独特转录特征 不同的间质细胞类型。这些信息也将使我们了解模式是如何建立的 作为它的功能。在这项建议中，我们将集中在间隙亚群的规格和功能 我们将细胞称为近端小管(PT)间质。 在这项提案中，我们将研究肾脏亚群指定的潜在机制。 成纤维细胞我们称为近端小管间质(PT间质)。凹槽/Rbpj和Yap/Taz 转录因子在这个种群中都是活跃的，使用Foxd1Cre消融这两条途径中的任何一条都有 在这种细胞类型的规范中揭示了重叠的角色。我们的初步分析表明，PT 间质是邻近近端小管成熟所必需的。我们假设PTS 和/或内皮细胞产生Notch/Rbpj和Yap/Taz激活剂，且具有重叠通路的细胞 活化成为PT间质。PT间质产生的信号促进 PTS的分化/成熟。这种串扰允许近端的共同成熟和整合 小管和其他皮质细胞类型。我们进一步假设，正常的皮质-髓质模式的破坏 导致YAP/Taz和/或Notch/Rbpj信号的缺陷，并导致缺乏 肾单位在这些组织中成熟。这些假设将在这里得到检验。这些目标的实现将开启 开辟了一个全新的肾脏间质生物学领域，将对多发性硬化产生长期持久的影响 研究领域包括肾脏发育、肾脏疾病、组织工程和肾脏损伤/再生。

Project Summary/Abstract The kidney is patterned along a cortical to medullary axis with specific segments of the nephron, collecting duct and vasculature all lying adjacent to each other in histologically distinct domains. In order for a kidney to function, different cell types from different cellular lineages must form at the same anatomical location. Although there has been some insight into how the individual lineages become patterned (such as proximal distal patterning of the nephron), how the different cell types/lineages coordinate their development resulting in the global patterning of the organ is unknown. We have recently found that the renal interstitial cells show extensive heterogeneity and patterning along the cortical/medullary axis of a newborn mouse kidney[1]. The patterned domains of the renal interstitium precisely map to the different anatomical domains within the kidney. How the different interstitial cell types arise and what role they play in kidney development/function are unknown. We hypothesize that the interstitium functions to relay and integrate signals from the different lineages and in turn, reinfources and integrates the differentiation of the renal parenchyma along the cortical/ medullary axis. Using bioinformatic analysis of single cell RNA-Seq data, we have identified unique transcriptional signatures for the different interstitial cell types. This information will allow us to understand how the pattern is established as well as its function. In this proposal, we will focus on the specification and function of a sub-population of interstitial cells we will refer to as the proximal tubule (PT) interstitium. In this proposal, we will investigate the mechanisms underlying specification of a subpopulation of renal fibroblasts we refer to as the proximal tubules interstitium (PT interstitium). Notch/Rbpj and Yap/Taz transcription factors are both active within this population and ablation of either pathway using Foxd1Cre has revealed overlapping roles in the specification of this cell type. Our preliminary analysis indicates that the PT interstitium is necessary for the maturation of the adjacent proximal tubules. We hypothesize that the PTs and/or endothelia produce Notch/Rbpj and Yap/Taz activators and that cells with overlapping pathway activation become PT intersitium. The PT interstitium produces signals that promote the differentiation/maturation of the PTs. This crosstalk allows the co-maturation and integration of the proximal tubules and other cortical cell types. We further hypothesize that disruption of normal cortical-medullary pattern in renal organoids leads to defects in Yap/Taz and/or Notch/Rbpj signaling and contributes to the lack of nephron maturation in these tissues. These hypotheses will be tested here. Completion of these aims will open up an entirely new field of kidney interstitial biology that will have a long and lasting impact on the multiple fields including kidney development, kidney disease, tissue engineering and kidney injury/regeneration.