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Intraperitoneal dye injection method for visualizing the functioning lymphatic vascular system in zebrafish and
Erina Saito1, Sumio Isogai2, Tomonori Deguchi3
1Department of Neuroanatomy, Cell Biology and Histology, Hirosaki University Graduate School of Medicine, Aomori, Japan.
Summary
Researchers developed a cost-effective method to visualize the entire lymphatic vascular system in fish. This technique uses dye injection to track lymph flow, aiding genetic screening and developmental studies of lymphatic vessels.
Area of Science:
- * Developmental Biology
- * Vascular Biology
- * Comparative Anatomy
Background:
- * The lymphatic vascular system is crucial for fluid balance, immune function, and fat absorption in vertebrates.
- * Traditional methods for visualizing lymphatic vessels include dye injection and serial sectioning.
- * Genetic tools and transgenic fish offer insights into lymphangiogenesis but have limitations in later developmental stages.
Purpose of the Study:
- * To develop a simple, reproducible, and cost-effective method for visualizing the entire lymphatic vascular system in live fish.
- * To utilize the physiological uptake of foreign particles by lymphatic endothelium for labeling.
- * To provide a tool applicable to large-scale genetic screening and electron microscopy studies.
Main Methods:
- * Intraperitoneal injection of trypan blue for temporal observation of lymphatic ducts.
- * Intraperitoneal injection of cinnabar (HgS) for electron microscopy identification of lymphatic endothelium.
- * Utilizing the natural uptake of foreign particles and lymph flow in zebrafish and medaka.
Main Results:
- * Intraperitoneal injection of trypan blue allows for temporal visualization of lymphatic ducts, suitable for genetic screening.
- * Cinnabar injection enables clear identification of lymphatic endothelium under electron microscopy without artefactual damage.
- * The method is reproducible, cost-effective, requires no special equipment, and is applicable to various fish models, including mutants.
Conclusions:
- * This novel injection technique provides a highly reproducible and accessible method for visualizing the complete lymphatic vascular system in live fish.
- * The approach overcomes limitations of existing methods, particularly for later developmental stages and genetic screening.
- * It offers a valuable tool for studying lymphatic vascular development and function across different fish models.
