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FATE OF THE LYMPHOCYTE.
1Pathological Laboratory of the University of Wisconsin, Madison.
The Journal of Experimental Medicine
|October 30, 2009
Summary
More lymphocytes enter the bloodstream daily than are present at any one time. These cells migrate to mucous membranes, particularly in the gastrointestinal tract, to perform their function.
Area of Science:
- Immunology
- Cell Biology
Background:
- Lymphocyte circulation is crucial for immune surveillance.
- The dynamic movement of lymphocytes between blood and tissues is not fully understood.
Purpose of the Study:
- To investigate the fate and function of lymphocytes entering the bloodstream from the thoracic duct.
- To elucidate the role of lymphocytes in mucosal immunity, especially within the gastrointestinal tract.
Main Methods:
- Analysis of lymphocyte counts and flow from the thoracic duct.
- Observation of lymphocyte migration patterns from blood vessels to mucosal surfaces.
- Investigation of lymphocyte localization within the gastrointestinal tract mucosa and lumen.
Main Results:
- A significant daily influx of lymphocytes from the thoracic duct exceeds the circulating blood count.
- Excess lymphocytes are not destroyed but actively migrate out of the bloodstream.
- Lymphocyte migration predominantly occurs into the gastrointestinal tract's mucous membranes.
Conclusions:
- Lymphocytes continuously traffic through the bloodstream and migrate to mucosal sites.
- The gastrointestinal tract serves as a primary site for lymphocyte function.
- Lymphocytes play a vital role in maintaining mucosal immunity and homeostasis.
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