[Morphogenesis, structure and properties of lymphatic vessels].

Area of Science:

• Vascular Biology
• Developmental Biology
• Pathology

Background:

• The lymphatic system collects tissue fluid, absorbs fats, and facilitates immune cell and tumor cell transport.
• Lymphatic capillaries possess unique structural features, including irregular lumens and discontinuous basement membranes, differing from blood capillaries.
• Specific surface antigens (Lyve-1, podoplanin, VEGFR3, Prox-1) and common endothelial markers identify lymphatic endothelial cells.

Purpose of the Study:

• To review literature on lymphatic vessel formation during embryonic development and pathological conditions.
• To elucidate the functions and unique characteristics of the lymphatic system.
• To discuss the molecular mechanisms and key regulators of lymphangiogenesis.

Main Methods:

• Literature review of studies on lymphatic vessel development and pathology.
• Analysis of molecular markers and signaling pathways involved in lymphangiogenesis.
• Discussion of diseases affecting the lymphatic system and associated tumors.

Main Results:

• Lymphatic vessel formation involves sprouting from veins, co-option of cells, or venous endothelial cell dedifferentiation.
• Key regulators of lymphangiogenesis include VEGF-C, VEGF-D, HGF, FGF, retinoic acid, IL-3, and IL-7.
• Macrophages and CD45+ cells may play roles in lymphatic formation and vessel caliber regulation.

Conclusions:

• Understanding lymphatic vessel formation is critical for addressing diseases like cancer and inflammatory conditions.
• The lymphatic system's unique structure and complex regulatory mechanisms are vital for physiological functions and disease progression.
• Further research into lymphangiogenesis holds potential for therapeutic interventions in lymphatic disorders and tumors.