Lymphatic vessels are routes for leukocyte migration and fluid drainage. In addition to their passive roles in migration of leukocytes, increasing evidence indicates their active roles in immune regulation. Tissue inflammation rapidly induces lymphatic endothelial cell proliferation and chemokine production, thereby resulting in lymphangiogenesis. Furthermore, lymphatic endothelial cells induce T cell tolerance through various mechanisms. In this review, we focus on the current knowledge on how inflammatory cytokines affect lymphangiogenesis and the roles of lymphatic vessels in modulating immune responses.
Cytokines ; Drainage ; Emigration and Immigration ; Endothelial Cells ; Inflammation ; Leukocytes ; Lymphangiogenesis ; Lymphatic Vessels*

Setleis syndrome, also known as the focal facial dermal dysplasia type 3, is characterized by atrophic scar-like lesions in both the temporal regions and other facial abnormalities. The syndrome is associated with a mutation in the TWIST2 gene and is inherited as an autosomal recessive pattern. Here, we describe a case of an 18-year-old woman and her 10-year-old brother with bitemporal depressed patches. The lesions were observed at birth, but they were replaced by atrophic patches after several months. No abnormalities in growth or development were observed. Histopathologic findings showed atrophy of the epidermis and loss of appendages, such as hair follicles and adnexal glands, in the atrophic patches compared to that of the adjacent normal skin.