Myovascular Mechanisms of Cardiac Growth and Regeneration

摘要： 我们和其他人已经确定，心肌细胞（CM）增殖依赖于心脏内皮细胞的增殖。 细胞（CEC）。新生小鼠中增殖的CEC与增殖的CM时空偶联 心脏; CEC的损失导致CM增殖减少;主血管生成因子水平升高 Vegfa促进斑马鱼，新生小鼠和人类的心脏生长。根据这些研究，我们 总的假设是活化的、增殖的CEC指导CM增殖。在这里，我们建议研究 以确定CEC如何促进CM增殖。我们将使用scRNA-seq和空间建模来识别 CEC的特定子集与增殖的CM物理相关;我们将确定Ezh 2- 介导的染色质重塑协调CEC激活与CM增殖;我们将定义 CEC诱导的生长因子刺激CM增殖的效力。这项工作将导致新的细胞， CEC诱导的心脏生长的表观遗传和旁分泌机制， 治疗性心脏再生的方法。

ABSTRACT: We, and others, have determined that cardiomyocyte (CM) proliferation is dependent on cardiac endothelial cells (CECs). Proliferating CECs are spatiotemporally coupled to proliferating CMs in the neonatal mouse heart; loss of CECs leads to decreased CM proliferation; and higher levels of the master angiogenic factor Vegfa promote cardiac growth in zebrafish, neonatal mice, and humans. Based on these studies, our overall hypothesis is that activated, proliferating CECs instruct CM proliferation. Here, we propose studies to determine how CECs promote CM proliferation. We will use scRNA-seq and spatial modeling to identify the specific subset of CECs physically associated with proliferating CMs; we will determine how Ezh2- mediated chromatin remodeling coordinates CEC activation with CM proliferation; and we will define the potency of CEC-induced growth factors to stimulate CM proliferation. This work will result in new cellular, epigenetic, and paracrine mechanisms for CEC-induced cardiac growth and has high potential to inform methods for therapeutic heart regeneration.