Daniel Greif MD
Assistant Professor of Medicine (Cardiology)
Vascular biology; Vascular smooth muscle; Vessel wall; Developmental biology; Clonal analysis; Lineage analysis; Pulmonary artery hypertension; Aorta; Intracranial hemorrhage; Atherosclerosis.
Cardiovascular disease is the number one cause of death globally. My laboratory utilizes multi-disciplinary approaches to investigate how blood vessels initially form, are maintained and go awry in disease. Our research spans from cultured cells to mouse models to human samples. We aim to gain critical insights into the pathogenesis of diverse cardiovascular pathologies and leverage these insights into novel therapeutics for human disease.
Extensive Research Description
My laboratory investigates blood vessel morphogenesis, the maintenance of the adult blood vessel and diseases of the vasculature. To this end, we utilize fundamental biochemical, genetic and developmental biological approaches. We initially investigated the origins of the smooth muscle and adventitial cells of the pulmonary artery and have delineated with cellular resolution the patterns of cell differentiation, proliferation, recruitment and migration in the developing pulmonary arterial wall. Furthermore, we have initiated a genetic dissection of the molecular processes and signals that underlie blood vessel formation and have demonstrated a role of the platelet derived growth factor pathway in this process.
Our ongoing and planned studies of vessel development, maintenance and disease use similar fundamental approaches. For instance, we are studying the morphogenesis of the walls of other vessels, such as the aorta and cerebral vasculature, and comparing and contrasting their morphogenesis with that of the pulmonary artery. In addition, little is known about the maintenance of blood vessels, and we are embarking on a study to evaluate the patterns of cell turnover, proliferation and migration as well as the underlying mechanisms in the adult vessel wall. Moreover, diseases of the vasculature are thought to largely involve a recapitulation of developmental programs, and we are applying our approaches to study animal models of vascular diseases that involve ectopic and aberrant smooth muscle cells, such as pulmonary artery hypertension, atherosclerosis, supravalvular aortic stenosis, restenosis and intracranial hemorrhage. Finally, we are studying clinical samples obtained from patients with vascular diseases and relating them to our findings in animal models.
Current Research Projects:
- Excess smooth muscle in pulmonary hypertension: cellular origins and recruitment and the role of pluripotency factors.
- Aortic wall development and disease (atherosclerosis, supravalvular aortic stenosis): progenitor cell specification, migration and differentiation.
- Mural cell TGF-beta signaling and blood brain barrier formation: implications for intracerebral hemorrhage.