Vascular remodeling in the ovary

项目总结 妊娠前三个月摘除黄体可导致终止妊娠。随着股价的上涨 不孕率和约25%的妊娠终止于妊娠早期，黄体生理学的研究越来越多。 切合实际。黄体功能的破坏是由炎性细胞因子和脂质介质介导的。关键的脂类 介质前列腺素F2α(PgF2α)在人和非人灵长类动物的腺体内产生，由 家畜的非妊娠子宫内膜。黄体是血运最丰富的组织之一。 成人体内的器官。排卵后黄体血管的发育对卵泡发育至关重要。 孕激素。黄体血管系统是独一无二的，因为它可能是唯一完全血管生成和 成人的血管退行性变。当黄体在非生育周期结束时退化时， 微血管内皮细胞是第一批死亡的细胞。然而，这些细胞并不表达 黄体溶解信号，pGF2α。只有类固醇生成的大黄体细胞(LLC)，它来自于卵巢颗粒细胞 排卵的卵泡在黄体中具有这种受体。因此，内皮细胞死亡反应 在退化的早期阶段，可能是由大黄体细胞释放的因子引起的 PgF2α.我们的主要假设是在黄体退化过程中内皮细胞网络的破坏 是由于大黄体细胞对前列腺素F2α的反应而产生的因子。这项研究的目标是：(1)确定 体内诱导黄体退化过程中基因转录的细胞特异性时间变化，以及(2)传导 利用一种新的3D器官培养确定黄体血管退行性变的介体的机制研究 系统。我们将使用单核rna测序(snrna-seq)来确定细胞类型特定的时间。 黄体退化过程中的基因表达模式。假设：大的类固醇生成的黄体细胞对 α通过迅速增加炎症介质和抗血管生成因子的产生，随后 在血管内皮细胞中诱导导致血管破裂和细胞死亡的基因。我们最近开发了 新的三维黄体器官模型，使我们能够确定哪个大的黄体细胞分泌产物(S)影响 黄体内皮细胞结构退化。假设：有限责任公司产生的炎症介质将扰乱 内皮网络和改变细胞命运。使用SnRNA-seq分析的最先进的方法将提供 第一份黄体细胞类型特定基因表达的无偏转录图谱。这些研究将 为特定黄体细胞类型的基因表达在过程中的时间变化提供了新的见解 黄体退化。拟议研究的成功完成将填补关于 维持性腺功能的关键途径和确定新的机制，通过这些新机制 前列腺素F2α扰乱性腺功能。对黄体血管退化的洞察将为确定 维持卵巢和其他生殖组织中的血管结构的机制。

PROJECT SUMMARY Corpus luteum removal during the first trimester of pregnancy leads to pregnancy termination. With rising infertility rates and ~25% of pregnancies ending in the first trimester, research in luteal physiology is increasingly relevant. Disruption of luteal function is mediated by inflammatory cytokines and lipid mediators. The key lipid mediator prostaglandin F2α (PGF2α) is produced within the gland in humans and non-human primates and by the non-pregnant endometrium in domestic farm animals. The corpus luteum is one of the most vascularized organs in the adult body. Development of the luteal vasculature following ovulation is vital for the production of progesterone. The luteal vasculature is unique because it is possibly the only case of full angiogenesis and angioregression in the adult. When the corpus luteum regresses at the end of a non-fertile reproductive cycle, microvascular endothelial cells are the first cells to die. However, these cells do not express receptors for the luteolytic signal, PGF2α. Only the steroidogenic large luteal cells (LLC), which derive from the granulosa cells of the ovulated follicle, possess this receptor in the corpus luteum. Therefore, the endothelial cell death response during the early stages of regression is likely initiated by factors released by large luteal cells in response to PGF2α. Our overarching hypothesis is that the disruption of endothelial cell networks during luteal regression are due to factors produced by large luteal cells in response to PGF2α. The goals of this study are to: (1) identify cell-specific temporal changes in gene transcription during induced luteal regression in vivo, and (2) conduct mechanistic studies to determine mediators of luteal angioregression utilizing a novel 3D organoid culture system. We will use single nuclear RNA sequencing (snRNA-seq) to determine the cell-type specific temporal patterns of gene expression during luteal regression. Hypothesis: Large steroidogenic luteal cells respond to PGF2α by rapidly increasing production of inflammatory mediators and anti-angiogenic factors, followed by induction of genes in endothelial cells that contribute to vascular disruption and cell death. We recently developed novel 3D luteal organoid model to allow us to determine which large luteal cell secretory product(s) affect the regression of luteal endothelial structures. Hypothesis: inflammatory mediators produced by LLC will disrupt endothelial networks and alter cell fate. The state-of-the-art approach using snRNA-seq profiling will provide the first unbiased transcriptomic atlas of the cell type specific gene expression in the corpus luteum. The studies will provide novel insight into the temporal changes in gene expression in specific luteal cell types during the process of luteal regression. Successful completion of the proposed research will fill a gap in knowledge about the pathways crucial for maintaining gonadal function and identify novel mechanisms by which the lipid mediator PGF2α disrupts gonadal function. Insight into luteal angioregression will provide the foundations for identifying mechanisms to maintain vasculature structures in the ovary and other reproductive tissues.