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Probing leukocyte traffic in lymph from oro-nasal mucosae by cervical catheterization in a sheep model
Isabelle Schwartz-Cornil1, Mathieu Epardaud, Jean-Pierre Albert
1Virologie et Immunologie Moléculaires UR892 INRA, Domaine de Vilvert, 78352 Jouy-en-Josas Cedex, France. isabelle.schwartz@jouy.inra.fr
Insights
Researchers developed a new in vivo method to collect lymph fluid from the head's mucosal tissues. This technique allows for the study of immune cell and particle movement to lymph nodes.
Area of Science:
- Immunology
- Cell Biology
- Physiology
Background:
- Lymph nodes receive information about tissue status, including inflammation, through lymphatic vessels.
- Understanding how tissues communicate with lymph nodes is crucial for immunity and vaccination strategies.
- The oro-nasal mucosa is a primary entry point for pathogens and a key site for immune responses.
Purpose of the Study:
- To develop and validate a novel in vivo technique for collecting lymph from head mucosal tissues.
- To investigate the mechanisms of tissue-to-node communication in a physiological setting.
- To analyze the types of immune cells and particles trafficked from the oro-nasal mucosa to lymph nodes.
Main Methods:
- Development of a pseudo-afferent lymph collection technique from oro-nasal mucosae in vivo.
- Reconstruction of lymphatic duct networks following lateral head lymph node resection, confirmed by lymphography.
- Catheterization of the cervical lymph duct for prolonged lymph collection (several weeks).
Main Results:
- Successfully collected cells originating from the oro-nasal mucosa via the cervical lymph duct.
- Identified various immune cells in the collected lymph, including dendritic cells, monocytes, granulocytes, and T and B lymphocytes.
- Demonstrated the feasibility of studying leukocyte and particulate trafficking over an extended period.
Conclusions:
- The novel in vivo lymph collection technique provides a unique and physiological model for studying head tissue-to-node immune cell trafficking.
- This method enables detailed analysis of immune cell and particulate (e.g., microorganisms, vaccines) transport under homeostatic and inflammatory conditions.
- The findings open new avenues for research in mucosal immunity, vaccine development, and understanding disease spread.
Abstract:
Lymph nodes are instructed via the lymph about ongoing events in tissues both during the steady state and under provoked inflammation. In order to probe for tissue-to-node transduction mechanisms, we have developed a novel in vivo technique of pseudo-afferent lymph collection from the oro-nasal mucosae which represent the main portals of entry of micro-organisms and efficient routes for vaccination. After lateral lymph node resection of the head, a network of lymph ducts was reconstructed as checked by lymphography. Subsequent catheterization of the cervical lymph duct allowed the collection of cells that were shown to originate from the oro-nasal mucosae. These cells included dendritic cells, monocytes, granulocytes, memory CD45RAneg CD2pos integrin beta7lo CD4 T cells, CD25pos CD4, CD8, gamma/delta T cells, and B lymphocytes. This approach, which permits lymph collection over several weeks, opens a valuable and unique way to study leukocyte and particulate (micro-organisms, vaccines) trafficking from head tissue to nodes under homeostastic and immuno-stimulatory conditions in a highly physiological setting.
