Retinal angiogenesis: Development and pathophysiology

Retinal angiogenesis is the process of new blood vessel formation within the retina, the light-sensitive tissue located at the back of the eye. It is a tightly regulated physiologic process essential for supplying oxygen and nutrients to retinal cells, supporting their metabolic needs, and maintaining overall retinal function. During retinal angiogenesis, new blood vessels sprout from pre-existing vessels in response to specific signals and cues within the retinal microenvironment. The process involves a series of coordinated events, including endothelial cell proliferation, migration, tube formation, and vessel maturation. The process of retinal angiogenesis is tightly regulated by a complex interplay of proangiogenic and antiangiogenic factors, including growth factors, cytokines, extracellular matrix components, and cell-cell signaling pathways. In addition to its role in normal retinal development, angiogenesis in the retina can also occur under pathologic conditions, leading to the formation of abnormal blood vessels. Conditions such as diabetic retinopathy, retinopathy of prematurity, and age-related macular degeneration are characterized by aberrant retinal angiogenesis, which can result in vision-threatening complications. Understanding the mechanisms that regulate retinal angiogenesis is essential for developing novel therapeutic strategies aimed at promoting normal vascular development, inhibiting pathologic angiogenesis, and preserving vision in patients with retinal vascular disorders.