The Lymphatic Vasculature in Lung Homeostasis and Disease

The lymphatic vasculature maintains lung homeostasis via fluid drainage in the form of lymph and by facilitating immune surveillance and leukocyte trafficking to the draining lymph nodes. Previous studies in both humans and animal models have demonstrated an important role for lymphatics in lung function from the neonatal period through adulthood. In addition, changes in the lymphatic vasculature have been observed in many respiratory diseases, and there is emerging evidence of a causative role for lymphatic dysfunction in the initiation and progression of lung pathology. Despite advances in the field, there are still many unanswered questions, and a more comprehensive understanding of the mechanisms by which the lymphatics affect lung homeostasis and the response to lung injury is needed. In this review, we discuss our current knowledge of the structure, function, and role of the lymphatics in the lung and how these vessels are involved in respiratory disease.