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Updated: Aug 8, 2026
Human T Lymphocyte Isolation, Culture and Analysis of Migration In Vitro
Published on: June 2, 2010
The physiology of lymphocyte migration through the single lymph node in vivo
1The Basel Institute for Immunology, Grenzacherstrasse 487, Basel, CH4005, Switzerland.
Insights
Lymphocyte recirculation through lymph nodes is vital for immune surveillance. This review explores how lymphocytes move through tissues and enter lymphatics, highlighting poorly understood regulatory mechanisms.
Area of Science:
- Immunology
- Cell Biology
- Physiology
Background:
- Lymphocytes continuously recirculate between blood and tissues via lymph for immune surveillance.
- While lymphocyte entry into lymph nodes is well-studied, their movement through tissues and exit into lymphatics is less understood.
- In vivo systems are crucial for studying lymphocyte recirculation dynamics.
Purpose of the Study:
- To review current knowledge on lymphocyte recirculation through lymph nodes.
- To discuss the interactions of recirculating lymphocyte pools in vivo.
- To highlight factors regulating lymphocyte traffic post-transendothelial migration.
Main Methods:
- Literature review of in vivo studies on lymphocyte recirculation.
- Analysis of data on lymphocyte-endothelial cell interactions.
- Discussion of factors influencing lymphocyte movement within lymph nodes and lymphatic vessels.
Main Results:
- Factors in afferent lymph, extracellular matrix distribution, and soluble regulators impact lymphocyte traffic.
- Lymphatic endothelial cells play an active role in regulating lymphocyte movement.
- The precise mechanisms of lymphocyte transit through extravascular tissue and entry into efferent lymphatics require further investigation.
Conclusions:
- Understanding lymphocyte recirculation requires examining post-transendothelial migration events.
- Further research is needed to determine the relative importance of various regulators of lymphocyte traffic.
- Elucidating these mechanisms is key to understanding immune surveillance and response.
Abstract:
Lymphocytes are mobile cells, continually recirculating between the blood and the tissues via the lymph. In order to maintain immune surveillance, the majority of lymphocyte traffic occurs through lymph nodes in vivo. Although a great deal of work has been done to elucidate the molecular mechanisms whereby lymphocytes leave the blood and enter the lymph node, lymphocyte traffic also requires that the lymphocyte successfully transit extravascular tissue and enter the lymph following transendothelial migration. The regulation of cell movement through lymph nodes, specific cellular positioning within the nodes, and eventual entry into the efferent lymphatics are poorly understood. The process of lymphocyte recirculation occurs in a physiological background, and in vivo systems have been particularly useful in uncovering the nuances of the process. This review summarizes available data about the recirculation of lymphocytes through the lymph node and the interaction of recirculating lymphocyte pools in vivo. The importance of factors in afferent lymph, the specific distribution of extracellular matrix proteins, potential soluble regulators of cell traffic, and evidence for an active role of lymphatic endothelial cells in the regulation of lymphocyte traffic are discussed. It seems likely that future work will need to be directed at determining the relative importance of these post-transendothelial migration regulators of lymphocyte traffic.
