Endothelial cell-dependent Notch signaling plays many critical roles in homeostasis and remodeling in the vasculature and serves an important role in the communication between endothelial cells and mural cells, including vascular smooth muscle cells (SMCs), pericytes, and fibroblasts. Our lab previously showed that endothelial cells govern SMC function and promote smooth muscle differentiation. Endothelial cells are able to induce smooth muscle cells into a mature contractile phenotype through cell contact and Notch signaling. Furthermore, Notch signaling has been shown to regulate SMC-specific gene and miR-143/145 expression to govern SMC differentiation. In this study, I demonstrated that endothelial cell-dependent Notch signaling enhances both contractile and synthetic phenotypes in smooth muscle cells, suggesting endothelial cells not only increase the contractile ability of smooth muscle cells, but might also signal to smooth muscle cells to build the basement membrane and form a functional blood vessel. My data indicate that the Notch2 receptor has a unique function in the regulation of SMC proliferation, and the Notch3 receptor has a distinct role in the regulation of synthetic phenotypes in smooth muscle cells.

Abstract: Proper blood vessel formation and function is crucial for embryogenesis, wound healing, pregnancy and diseases. The interaction of endothelial cells and vascular smooth muscle cells/pericytes is critical for assembling and maintaining blood vessels. Previously, our lab and other groups showed that endothelial cells play an important role in governing vascular smooth muscle cell functions. To further investigate the signaling mechanisms that govern the interaction of vascular cells, we screened for genes and microRNAs whose expression was significantly altered by the endothelial cell-smooth muscle cell interaction.

In the last several years, the development of reagents that recognize smooth muscle-specific proteins has enabled researchers to identify smooth muscle cells (SMC) in tissue undergoing both differentiation and repair. These developments have led to increased research on SMC. The latest volume in the Biology of the Extracellular Matrix Series takes a current and all-encompassing look at this growing area of research. Devoted entirely to the subject of SMC, the book covers a diversity of topics-from SMC architecture and contractility to differentiation and gene expression in development. It also examines the proliferation and replication of SMC and its role in pharmacology and vascular disease. A must for cell, developmental, and molecular biologists, this book also will appeal to cardiologists, pathologists, and biomedical researchers interested in smooth muscle cells. Presents a molecular, genetic, and developmental perspective of the vas smooth muscle cell Overview sections highlight key points of chapters, including the clinical relevance of the research and expectations for future study Appeals to both the basic biologist and to the biomedical researcher of vascular disease

The endothelium, a monolayer of endothelial cells, constitutes the inner cellular lining of the blood vessels (arteries, veins and capillaries) and the lymphatic system, and therefore is in direct contact with the blood/lymph and the circulating cells. The endothelium is a major player in the control of blood fluidity, platelet aggregation and vascular tone, a major actor in the regulation of immunology, inflammation and angiogenesis, and an important metabolizing and an endocrine organ. Endothelial cells controls vascular tone, and thereby blood flow, by synthesizing and releasing relaxing and contracting factors such as nitric oxide, metabolites of arachidonic acid via the cyclooxygenases, lipoxygenases and cytochrome P450 pathways, various peptides (endothelin, urotensin, CNP, adrenomedullin, etc.), adenosine, purines, reactive oxygen species and so on. Additionally, endothelial ectoenzymes are required steps in the generation of vasoactive hormones such as angiotensin II. An endothelial dysfunction linked to an imbalance in the synthesis and/or the release of these various endothelial factors may explain the initiation of cardiovascular pathologies (from hypertension to atherosclerosis) or their development and perpetuation. Table of Contents: Introduction / Multiple Functions of the Endothelial Cells / Calcium Signaling in Vascular Cells and Cell-to-Cell Communications / Endothelium-Dependent Regulation of Vascular Tone / Conclusion / References

This volume explores novel concepts of pericyte biology. The present book is an attempt to describe the most recent developments in the area of pericyte biology which is one of the emergent hot topics in the field of molecular and cellular biology today. Here, we present a selected collection of detailed chapters on what we know so far about the pericytes. Together with its companion volumes Pericyte Biology in Different Organs and Pericyte Biology in Disease, Pericyte Biology - Novel Concepts presents a comprehensive update on the latest information and most novel functions attributed to pericytes. To those researchers newer to this area, it will be useful to have the background information on these cells' unique history. It will be invaluable for both advanced cell biology students as well as researchers in cell biology, stem cells and researchers or clinicians involved with specific diseases.

The formation of blood vessels is an essential aspect of embryogenesis in vertebrates. It is a central feature of numerous post-embryonic processes, including tissue and organ growth and regeneration. It is also part of the pathology of tumour formation and certain inflammatory conditions. In recent years, comprehension of the molecular genetics of blood vessel formation has progressed enormously and studies in vertebrate model systems, especially the mouse and the zebrafish, have identified a common set of molecules and processes that are conserved throughout vertebrate embryogenesis while, in addition, highlighting aspects that may differ between different animal groups. The discovery in the past decade of the crucial role of new blood vessel formation for the development of cancers has generated great interest in angiogenesis (the formation of new blood vessels from pre-existing ones), with its major implications for potential cancer-control strategies. In addition, there are numerous situations where therapeutic treatments either require or would be assisted by vasculogenesis (the de novo formation of blood vessels). In particular, post-stroke therapies could include treatments that stimulate neovascularization of the affected tissues. The development of such treatments, however, requires thoroughly understanding the developmental properties of endothelial cells and the basic biology of blood vessel formation. While there are many books on angiogenesis, this unique book focuses on exactly this basic biology and explores blood vessel formation in connection with tissue development in a range of animal models. It includes detailed discussions of relevant cell biology, genetics and embryogenesis of blood vessel formation and presents insights into the cross-talk between developing blood vessels and other tissues. With contributions from vascular biologists, cell biologists and developmental biologists, a comprehensive and highly interdisciplinary volume is the outcome.